Fix group list updating. (#6748)

Do not show in changelog

.circleci/config.yml

@@ -11,13 +11,24 @@
 version: 2.1
 orbs:
   aws-cli: circleci/aws-cli@2.0.6
+  macos: circleci/macos@2.5.1 # For Rosetta (see below)
+  node: circleci/node@5.2.0 # For a recent npm version (see below)
 jobs:
   # Build the **entire** app for macOS.
   build-macos:
     macos:
       xcode: 14.2.0
+    resource_class: macos.m1.large.gen1
     steps:
       - checkout
+      # Install Rosetta for AWS CLI and disable TSO to speed up S3 uploads (https://support.circleci.com/hc/en-us/articles/19334402064027-Troubleshooting-slow-uploads-to-S3-for-jobs-using-an-m1-macOS-resource-class)
+      - macos/install-rosetta
+      - run: sudo sysctl net.inet.tcp.tso=0
+
+      # Install a recent version of npm to workaround a notarization issue because of a symlink made by npm: https://github.com/electron-userland/electron-builder/issues/7755
+      # Node.js v20.14.0 comes with npm v10.7.0.
+      - node/install:
+          node-version: "20.14.0"
 
       # System dependencies (for Emscripten and upload)
       - run:

.semaphore/semaphore.yml

@@ -56,6 +56,7 @@ blocks:
         - name: GDJS typing and documentation generation
           commands:
             - checkout
+            - cache restore newIDE-app-node_modules-$SEMAPHORE_GIT_BRANCH-revision-$(checksum newIDE/app/package-lock.json)
             - cache restore GDJS-node_modules-$SEMAPHORE_GIT_BRANCH-revision-$(checksum GDJS/package-lock.json)
             - cache restore GDJS-tests-node_modules-$SEMAPHORE_GIT_BRANCH-revision-$(checksum GDJS/tests/package-lock.json)
             - cd GDJS

.travis.yml

@@ -17,11 +17,11 @@ cache:
 addons:
   apt:
     sources:
-    - ubuntu-toolchain-r-test
+      - ubuntu-toolchain-r-test
     packages:
-    # Build dependencies:
-    - cmake
-    - p7zip-full
+      # Build dependencies:
+      - cmake
+      - p7zip-full
 
 before_install:
   # This workaround is required to avoid libstdc++ errors (Emscripten requires a recent version of libstdc++)
@@ -29,47 +29,48 @@ before_install:
   - sudo dpkg --force-all -i libstdc++6
 
 install:
-# Ensure we use a recent version of Node.js (and npm).
+  # Ensure we use a recent version of Node.js (and npm).
   - nvm install v16 && nvm use v16
-#Compile the tests only for GDCore
+  #Compile the tests only for GDCore
   - mkdir .build-tests
   - cd .build-tests
   - cmake -DBUILD_GDJS=FALSE -DBUILD_TESTS=TRUE -DCMAKE_CXX_COMPILER=$(which $CXX) -DCMAKE_C_COMPILER=$(which $CC) ..
   - make -j 4
   - cd ..
-# Install Emscripten (for GDevelop.js)
-  - git clone https://github.com/juj/emsdk.git
+  # Install Emscripten (for GDevelop.js)
+  # Specify the tag for the core repository to avois breaking changes.
+  - git clone --depth 1 --branch 3.1.21 https://github.com/juj/emsdk.git
   - cd emsdk && ./emsdk install 3.1.21 && ./emsdk activate 3.1.21 && cd ..
-# Install GDevelop.js dependencies
+  # Install GDevelop.js dependencies
   - cd GDevelop.js && npm install && cd ..
-# Build GDevelop.js
-# (in a subshell to avoid Emscripten polluting the Node.js and npm version for the rest of the build)
+  # Build GDevelop.js
+  # (in a subshell to avoid Emscripten polluting the Node.js and npm version for the rest of the build)
   - (set -e; cd GDevelop.js && source ../emsdk/emsdk_env.sh && npm run build && cd ..)
-# Install newIDE tests dependencies
+  # Install newIDE tests dependencies
   - npm -v
   - cd newIDE/app && npm install
   - cd ../..
-# Install GDJS tests dependencies
+  # Install GDJS tests dependencies
   - cd GDJS && npm install && cd tests && npm install
   - cd ../..
 
 script:
-# GDCore tests:
+  # GDCore tests:
   - cd .build-tests
   - Core/GDCore_tests
   - cd ..
-# GDevelop.js tests
+  # GDevelop.js tests
   - cd GDevelop.js
   - npm test
   - cd ..
-# newIDE tests:
+  # newIDE tests:
   - cd newIDE/app
   - npm test
   - npm run flow
   - npm run check-format
   - npm run check-script-types
   - cd ../..
-# GDJS tests:
+  # GDJS tests:
   - cd GDJS
   - npm run check-format
   - cd ..

.vscode/tasks.json

@@ -8,6 +8,7 @@
       "group": "build",
       "label": "Start development server",
       "detail": "Starts the GDevelop development server.",
+      "options": { "env": { "NODE_OPTIONS": "--max-old-space-size=8192" } },
       "problemMatcher": [
         {
           "owner": "cra",

Core/GDCore/Events/Builtin/ForEachChildVariableEvent.cpp

@@ -49,7 +49,8 @@ vector<pair<gd::Expression*, gd::ParameterMetadata> >
     ForEachChildVariableEvent::GetAllExpressionsWithMetadata() {
   vector<pair<gd::Expression*, gd::ParameterMetadata> >
       allExpressionsWithMetadata;
-  auto metadata = gd::ParameterMetadata().SetType("scenevar");
+  auto metadata = gd::ParameterMetadata().SetType("variable");
+  metadata.SetExtraInfo("AllowUndeclaredVariable");
   allExpressionsWithMetadata.push_back(
       std::make_pair(&iterableVariableName, metadata));
   allExpressionsWithMetadata.push_back(
@@ -63,7 +64,8 @@ vector<pair<const gd::Expression*, const gd::ParameterMetadata> >
     ForEachChildVariableEvent::GetAllExpressionsWithMetadata() const {
   vector<pair<const gd::Expression*, const gd::ParameterMetadata> >
       allExpressionsWithMetadata;
-  auto metadata = gd::ParameterMetadata().SetType("scenevar");
+  auto metadata = gd::ParameterMetadata().SetType("variable");
+  metadata.SetExtraInfo("AllowUndeclaredVariable");
   allExpressionsWithMetadata.push_back(
       std::make_pair(&iterableVariableName, metadata));
   allExpressionsWithMetadata.push_back(

Core/GDCore/Events/Builtin/RepeatEvent.h

@@ -4,8 +4,8 @@
  * reserved. This project is released under the MIT License.
  */
 
-#ifndef GDCORE_REPEATEVENT_H
-#define GDCORE_REPEATEVENT_H
+#pragma once
+
 #include "GDCore/Events/Event.h"
 #include "GDCore/Events/EventsList.h"
 namespace gd {
@@ -36,10 +36,10 @@ class GD_CORE_API RepeatEvent : public gd::BaseEvent {
   const gd::InstructionsList& GetActions() const { return actions; };
   gd::InstructionsList& GetActions() { return actions; };
 
-  const gd::String& GetRepeatExpression() const {
-    return repeatNumberExpression.GetPlainString();
+  const gd::Expression& GetRepeatExpression() const {
+    return repeatNumberExpression;
   };
-  void SetRepeatExpression(gd::String repeatNumberExpression_) {
+  void SetRepeatExpressionPlainString(gd::String repeatNumberExpression_) {
     repeatNumberExpression = gd::Expression(repeatNumberExpression_);
   };
 
@@ -68,5 +68,3 @@ class GD_CORE_API RepeatEvent : public gd::BaseEvent {
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_REPEATEVENT_H

Core/GDCore/Events/Builtin/StandardEvent.cpp

@@ -15,7 +15,8 @@ using namespace std;
 
 namespace gd {
 
-StandardEvent::StandardEvent() : BaseEvent() {}
+StandardEvent::StandardEvent()
+    : BaseEvent(), variables(gd::VariablesContainer::SourceType::Local) {}
 
 StandardEvent::~StandardEvent(){};
 
@@ -57,6 +58,9 @@ void StandardEvent::SerializeTo(SerializerElement& element) const {
   if (!events.IsEmpty())
     gd::EventsListSerialization::SerializeEventsTo(events,
                                                   element.AddChild("events"));
+  if (HasVariables()) {
+    variables.SerializeTo(element.AddChild("variables"));
+  }
 }
 
 void StandardEvent::UnserializeFrom(gd::Project& project,
@@ -71,6 +75,11 @@ void StandardEvent::UnserializeFrom(gd::Project& project,
     gd::EventsListSerialization::UnserializeEventsFrom(
         project, events, element.GetChild("events", 0, "Events"));
   }
+
+  variables.Clear();
+  if (element.HasChild("variables")) {
+    variables.UnserializeFrom(element.GetChild("variables"));
+  }
 }
 
 }  // namespace gd

Core/GDCore/Events/Builtin/StandardEvent.h

@@ -4,13 +4,13 @@
  * reserved. This project is released under the MIT License.
  */
 
-#if defined(GD_IDE_ONLY)
-#ifndef GDCORE_STANDARDEVENT_H
-#define GDCORE_STANDARDEVENT_H
+#pragma once
+
 #include "GDCore/Events/Event.h"
 #include "GDCore/Events/EventsList.h"
 #include "GDCore/Events/Instruction.h"
 #include "GDCore/Events/InstructionsList.h"
+#include "GDCore/Project/VariablesContainer.h"
 namespace gd {
 class Instruction;
 class Project;
@@ -33,6 +33,10 @@ class GD_CORE_API StandardEvent : public gd::BaseEvent {
   virtual const gd::EventsList& GetSubEvents() const { return events; };
   virtual gd::EventsList& GetSubEvents() { return events; };
 
+  virtual bool CanHaveVariables() const { return true; }
+  virtual const gd::VariablesContainer& GetVariables() const { return variables; };
+  virtual gd::VariablesContainer& GetVariables() { return variables; };
+
   const gd::InstructionsList& GetConditions() const { return conditions; };
   gd::InstructionsList& GetConditions() { return conditions; };
 
@@ -53,9 +57,7 @@ class GD_CORE_API StandardEvent : public gd::BaseEvent {
   gd::InstructionsList conditions;
   gd::InstructionsList actions;
   EventsList events;
+  VariablesContainer variables;
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_STANDARDEVENT_H
-#endif

Core/GDCore/Events/CodeGeneration/DiagnosticReport.h

@@ -0,0 +1,117 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include "GDCore/String.h"
+#include "GDCore/Tools/MakeUnique.h"
+
+namespace gd {
+
+/**
+ * \brief 
+ */
+class GD_CORE_API ProjectDiagnostic {
+public:
+  enum ErrorType {
+    UndeclaredVariable,
+    MissingBehavior,
+    UnknownObject,
+    MismatchedObjectType,
+  };
+
+  ProjectDiagnostic(ErrorType type_, const gd::String &message_,
+                    const gd::String &actualValue_,
+                    const gd::String &expectedValue_, const gd::String &objectName_ = "")
+      : type(type_), message(message_), actualValue(actualValue_), expectedValue(expectedValue_),
+        objectName(objectName_){};
+  virtual ~ProjectDiagnostic(){};
+
+  ErrorType GetType() const { return type; };
+  const gd::String &GetMessage() const { return message; }
+  const gd::String &GetObjectName() const { return objectName; }
+  const gd::String &GetActualValue() const { return actualValue; }
+  const gd::String &GetExpectedValue() const { return expectedValue; }
+
+private:
+  ErrorType type;
+  gd::String message;
+  gd::String objectName;
+  gd::String actualValue;
+  gd::String expectedValue;
+};
+
+/**
+ * \brief 
+ */
+class GD_CORE_API DiagnosticReport {
+public:
+  DiagnosticReport(){};
+  virtual ~DiagnosticReport(){};
+
+  void Add(const gd::ProjectDiagnostic &projectDiagnostic) {
+    projectDiagnostics.push_back(
+        gd::make_unique<gd::ProjectDiagnostic>(projectDiagnostic));
+  };
+
+  const ProjectDiagnostic &Get(std::size_t index) const {
+    return *projectDiagnostics[index].get();
+  };
+
+  std::size_t Count() const { return projectDiagnostics.size(); };
+
+  const gd::String &GetSceneName() const { return sceneName; }
+
+  void SetSceneName(const gd::String &sceneName_) {
+    sceneName = sceneName_;
+  }
+
+private:
+  std::vector<std::unique_ptr<gd::ProjectDiagnostic>> projectDiagnostics;
+  gd::String sceneName;
+};
+
+/**
+ * \brief 
+ */
+class GD_CORE_API WholeProjectDiagnosticReport {
+public:
+  WholeProjectDiagnosticReport(){};
+  virtual ~WholeProjectDiagnosticReport(){};
+
+  const DiagnosticReport &Get(std::size_t index) const {
+    return *diagnosticReports[index].get();
+  };
+
+  void Clear() {
+    diagnosticReports.clear();
+  };
+
+  DiagnosticReport& AddNewDiagnosticReportForScene(const gd::String &sceneName) {
+    auto diagnosticReport = gd::make_unique<gd::DiagnosticReport>();
+    diagnosticReport->SetSceneName(sceneName);
+    diagnosticReports.push_back(std::move(diagnosticReport));
+    return *diagnosticReports[diagnosticReports.size() - 1].get();
+  };
+
+  std::size_t Count() const { return diagnosticReports.size(); };
+
+  bool HasAnyIssue() {
+    for (auto& diagnosticReport : diagnosticReports) {
+      if (diagnosticReport->Count() > 0) {
+        return true;
+      }
+    }
+    return false;
+  }
+
+private:
+  std::vector<std::unique_ptr<gd::DiagnosticReport>> diagnosticReports;
+};
+
+} // namespace gd

Core/GDCore/Events/CodeGeneration/EventsCodeGenerationContext.h

@@ -3,8 +3,8 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef EVENTSCODEGENERATIONCONTEXT_H
-#define EVENTSCODEGENERATIONCONTEXT_H
+#pragma once
+
 #include <map>
 #include <memory>
 #include <set>
@@ -325,4 +325,3 @@ class GD_CORE_API EventsCodeGenerationContext {
 };
 
 }  // namespace gd
-#endif  // EVENTSCODEGENERATIONCONTEXT_H

Core/GDCore/Events/CodeGeneration/EventsCodeGenerator.cpp

@@ -14,6 +14,7 @@
 #include "GDCore/Extensions/Metadata/ParameterMetadataTools.h"
 #include "GDCore/Extensions/Platform.h"
 #include "GDCore/Extensions/PlatformExtension.h"
+#include "GDCore/IDE/Events/ExpressionVariableNameFinder.h"
 #include "GDCore/Project/Layout.h"
 #include "GDCore/Project/ObjectsContainer.h"
 #include "GDCore/Project/ObjectsContainersList.h"
@@ -254,12 +255,12 @@ gd::String EventsCodeGenerator::GenerateMutatorCall(
   }
 
   gd::String operatorStr = arguments[operatorIndex];
-  if (operatorStr.size() > 2)
+  if (operatorStr.size() > 2 && operatorStr[0] == '\"') {
     operatorStr = operatorStr.substr(
         1,
         operatorStr.length() - 1 -
             1);  // Operator contains quote which must be removed.
-
+  }
   auto mutators = instrInfos.codeExtraInformation.optionalMutators;
   auto mutator = mutators.find(operatorStr);
   if (mutator == mutators.end()) {
@@ -279,6 +280,9 @@ gd::String EventsCodeGenerator::GenerateMutatorCall(
       argumentsStr += arguments[i];
     }
   }
+  if (instrInfos.GetManipulatedType() == "boolean") {
+    return callStartString + "(" + argumentsStr + ")." + mutator->second;
+  }
 
   return callStartString + "(" + argumentsStr + ")." + mutator->second + "(" +
          rhs + ")";
@@ -318,17 +322,30 @@ gd::String EventsCodeGenerator::GenerateConditionCode(
     condition.SetParameters(parameters);
   }
 
+  gd::EventsCodeGenerator::CheckBehaviorParameters(condition, instrInfos);
   // Verify that there are no mismatches between object type in parameters.
   for (std::size_t pNb = 0; pNb < instrInfos.parameters.size(); ++pNb) {
     if (ParameterMetadata::IsObject(instrInfos.parameters[pNb].GetType())) {
       gd::String objectInParameter =
           condition.GetParameter(pNb).GetPlainString();
 
-      if (!GetObjectsContainersList().HasObjectOrGroupNamed(objectInParameter)) {
+      const auto &expectedObjectType =
+          instrInfos.parameters[pNb].GetExtraInfo();
+      const auto &actualObjectType =
+          GetObjectsContainersList().GetTypeOfObject(objectInParameter);
+      if (!GetObjectsContainersList().HasObjectOrGroupNamed(
+              objectInParameter)) {
+        gd::ProjectDiagnostic projectDiagnostic(
+            gd::ProjectDiagnostic::ErrorType::UnknownObject, "",
+            objectInParameter, "");
+        diagnosticReport->Add(projectDiagnostic);
         return "/* Unknown object - skipped. */";
-      } else if (!instrInfos.parameters[pNb].GetExtraInfo().empty() &&
-                GetObjectsContainersList().GetTypeOfObject(objectInParameter) !=
-                     instrInfos.parameters[pNb].GetExtraInfo()) {
+      } else if (!expectedObjectType.empty() &&
+                 actualObjectType != expectedObjectType) {
+        gd::ProjectDiagnostic projectDiagnostic(
+            gd::ProjectDiagnostic::ErrorType::MismatchedObjectType, "",
+            actualObjectType, expectedObjectType, objectInParameter);
+        diagnosticReport->Add(projectDiagnostic);
         return "/* Mismatched object type - skipped. */";
       }
     }
@@ -364,15 +381,22 @@ gd::String EventsCodeGenerator::GenerateConditionCode(
       }
     }
   } else if (instrInfos.IsBehaviorInstruction()) {
-    gd::String objectName = condition.GetParameter(0).GetPlainString();
-    gd::String behaviorType = GetObjectsContainersList().GetTypeOfBehavior(condition.GetParameter(1).GetPlainString());
     if (instrInfos.parameters.size() >= 2) {
+      const gd::String &objectName = condition.GetParameter(0).GetPlainString();
+      const gd::String &behaviorName =
+          condition.GetParameter(1).GetPlainString();
+      const gd::String &actualBehaviorType =
+          GetObjectsContainersList().GetTypeOfBehavior(behaviorName);
+
       std::vector<gd::String> realObjects =
-          GetObjectsContainersList().ExpandObjectName(objectName, context.GetCurrentObject());
+          GetObjectsContainersList().ExpandObjectName(
+              objectName, context.GetCurrentObject());
+
+      const BehaviorMetadata &autoInfo =
+          MetadataProvider::GetBehaviorMetadata(platform, actualBehaviorType);
+
       for (std::size_t i = 0; i < realObjects.size(); ++i) {
         // Setup context
-        const BehaviorMetadata& autoInfo =
-            MetadataProvider::GetBehaviorMetadata(platform, behaviorType);
         AddIncludeFiles(autoInfo.includeFiles);
         context.SetCurrentObject(realObjects[i]);
         context.ObjectsListNeeded(realObjects[i]);
@@ -382,7 +406,7 @@ gd::String EventsCodeGenerator::GenerateConditionCode(
             condition.GetParameters(), instrInfos.parameters, context);
         conditionCode += GenerateBehaviorCondition(
             realObjects[i],
-            condition.GetParameter(1).GetPlainString(),
+            behaviorName,
             autoInfo,
             arguments,
             instrInfos,
@@ -457,6 +481,33 @@ gd::String EventsCodeGenerator::GenerateConditionsListCode(
   return outputCode;
 }
 
+void EventsCodeGenerator::CheckBehaviorParameters(
+    const gd::Instruction &instruction,
+    const gd::InstructionMetadata &instrInfos) {
+  gd::ParameterMetadataTools::IterateOverParameters(
+      instruction.GetParameters(), instrInfos.parameters,
+      [this](const gd::ParameterMetadata &parameterMetadata,
+             const gd::Expression &parameterValue,
+             const gd::String &lastObjectName) {
+        if (ParameterMetadata::IsBehavior(parameterMetadata.GetType())) {
+          const gd::String &behaviorName = parameterValue.GetPlainString();
+          const gd::String &actualBehaviorType =
+              GetObjectsContainersList().GetTypeOfBehaviorInObjectOrGroup(
+                  lastObjectName, behaviorName);
+          const gd::String &expectedBehaviorType =
+              parameterMetadata.GetExtraInfo();
+
+          if (!expectedBehaviorType.empty() &&
+              actualBehaviorType != expectedBehaviorType) {
+            gd::ProjectDiagnostic projectDiagnostic(
+                gd::ProjectDiagnostic::ErrorType::MissingBehavior, "",
+                actualBehaviorType, expectedBehaviorType, lastObjectName);
+            diagnosticReport->Add(projectDiagnostic);
+          }
+        }
+      });
+}
+
 /**
  * Generate code for an action.
  */
@@ -494,15 +545,29 @@ gd::String EventsCodeGenerator::GenerateActionCode(
     action.SetParameters(parameters);
   }
 
+  gd::EventsCodeGenerator::CheckBehaviorParameters(action, instrInfos);
   // Verify that there are no mismatches between object type in parameters.
   for (std::size_t pNb = 0; pNb < instrInfos.parameters.size(); ++pNb) {
     if (ParameterMetadata::IsObject(instrInfos.parameters[pNb].GetType())) {
       gd::String objectInParameter = action.GetParameter(pNb).GetPlainString();
-      if (!GetObjectsContainersList().HasObjectOrGroupNamed(objectInParameter)) {
+
+      const auto &expectedObjectType =
+          instrInfos.parameters[pNb].GetExtraInfo();
+      const auto &actualObjectType =
+          GetObjectsContainersList().GetTypeOfObject(objectInParameter);
+      if (!GetObjectsContainersList().HasObjectOrGroupNamed(
+              objectInParameter)) {
+        gd::ProjectDiagnostic projectDiagnostic(
+            gd::ProjectDiagnostic::ErrorType::UnknownObject, "",
+            objectInParameter, "");
+        diagnosticReport->Add(projectDiagnostic);
         return "/* Unknown object - skipped. */";
-      } else if (!instrInfos.parameters[pNb].GetExtraInfo().empty() &&
-                 GetObjectsContainersList().GetTypeOfObject(objectInParameter) !=
-                     instrInfos.parameters[pNb].GetExtraInfo()) {
+      } else if (!expectedObjectType.empty() &&
+                 actualObjectType != expectedObjectType) {
+        gd::ProjectDiagnostic projectDiagnostic(
+            gd::ProjectDiagnostic::ErrorType::MismatchedObjectType, "",
+            actualObjectType, expectedObjectType, objectInParameter);
+        diagnosticReport->Add(projectDiagnostic);
         return "/* Mismatched object type - skipped. */";
       }
     }
@@ -540,17 +605,22 @@ gd::String EventsCodeGenerator::GenerateActionCode(
       }
     }
   } else if (instrInfos.IsBehaviorInstruction()) {
-    gd::String objectName = action.GetParameter(0).GetPlainString();
-    gd::String behaviorType = GetObjectsContainersList().GetTypeOfBehavior(action.GetParameter(1).GetPlainString());
-
     if (instrInfos.parameters.size() >= 2) {
+      const gd::String &objectName = action.GetParameter(0).GetPlainString();
+      const gd::String &behaviorName = action.GetParameter(1).GetPlainString();
+      const gd::String &actualBehaviorType =
+          GetObjectsContainersList().GetTypeOfBehavior(behaviorName);
+
       std::vector<gd::String> realObjects =
-          GetObjectsContainersList().ExpandObjectName(objectName, context.GetCurrentObject());
+          GetObjectsContainersList().ExpandObjectName(
+              objectName, context.GetCurrentObject());
+
+      const BehaviorMetadata &autoInfo =
+          MetadataProvider::GetBehaviorMetadata(platform, actualBehaviorType);
+
+      AddIncludeFiles(autoInfo.includeFiles);
       for (std::size_t i = 0; i < realObjects.size(); ++i) {
         // Setup context
-        const BehaviorMetadata& autoInfo =
-            MetadataProvider::GetBehaviorMetadata(platform, behaviorType);
-        AddIncludeFiles(autoInfo.includeFiles);
         context.SetCurrentObject(realObjects[i]);
         context.ObjectsListNeeded(realObjects[i]);
 
@@ -559,7 +629,7 @@ gd::String EventsCodeGenerator::GenerateActionCode(
             action.GetParameters(), instrInfos.parameters, context);
         actionCode +=
             GenerateBehaviorAction(realObjects[i],
-                                   action.GetParameter(1).GetPlainString(),
+                                   behaviorName,
                                    autoInfo,
                                    functionCallName,
                                    arguments,
@@ -583,6 +653,29 @@ gd::String EventsCodeGenerator::GenerateActionCode(
   return actionCode;
 }
 
+gd::String EventsCodeGenerator::GenerateLocalVariablesStackAccessor() {
+  return (HasProjectAndLayout() ? GetCodeNamespace()
+                                : "eventsFunctionContext") +
+         ".localVariables";
+}
+
+gd::String EventsCodeGenerator::GenerateAnyOrSceneVariableGetter(
+    const gd::Expression &variableExpression,
+    EventsCodeGenerationContext &context) {
+  const auto variableName = gd::ExpressionVariableNameFinder::GetVariableName(
+      *variableExpression.GetRootNode());
+
+  gd::String variableParameterType =
+      GetProjectScopedContainers().GetVariablesContainersList().Has(
+          variableName)
+          ? "variable"
+          : "scenevar";
+
+  return gd::ExpressionCodeGenerator::GenerateExpressionCode(
+      *this, context, variableParameterType,
+      variableExpression.GetPlainString(), "", "AllowUndeclaredVariable");
+}
+
 const EventsCodeGenerator::CallbackDescriptor
 EventsCodeGenerator::GenerateCallback(
     const gd::String& callbackID,
@@ -607,14 +700,23 @@ EventsCodeGenerator::GenerateCallback(
     actionsCode += "} //End of subevents\n";
   }
 
+  gd::String restoreLocalVariablesCode;
+  restoreLocalVariablesCode +=
+      "asyncObjectsList.restoreLocalVariablesContainers(" +
+      GenerateLocalVariablesStackAccessor() + ");\n";
+
   // Compose the callback function and add outside main
   const gd::String actionsDeclarationsCode =
       GenerateObjectsDeclarationCode(callbackContext);
 
+  const gd::String clearLocalVariablesCode =
+      GenerateLocalVariablesStackAccessor() + ".length = 0;\n";
+
   const gd::String callbackCode = callbackFunctionName + " = function (" +
                                   GenerateEventsParameters(callbackContext) +
-                                  ") {\n" + actionsDeclarationsCode +
-                                  actionsCode + "}\n";
+                                  ") {\n" + restoreLocalVariablesCode +
+                                  actionsDeclarationsCode + actionsCode +
+                                  clearLocalVariablesCode + "}\n";
 
   AddCustomCodeOutsideMain(callbackCode);
 
@@ -677,13 +779,13 @@ gd::String EventsCodeGenerator::GenerateParameterCodes(
 
   if (ParameterMetadata::IsExpression("number", metadata.GetType())) {
     argOutput = gd::ExpressionCodeGenerator::GenerateExpressionCode(
-        *this, context, "number", parameter, lastObjectName);
+        *this, context, "number", parameter, lastObjectName, metadata.GetExtraInfo());
   } else if (ParameterMetadata::IsExpression("string", metadata.GetType())) {
     argOutput = gd::ExpressionCodeGenerator::GenerateExpressionCode(
-        *this, context, "string", parameter, lastObjectName);
+        *this, context, "string", parameter, lastObjectName, metadata.GetExtraInfo());
   } else if (ParameterMetadata::IsExpression("variable", metadata.GetType())) {
     argOutput = gd::ExpressionCodeGenerator::GenerateExpressionCode(
-        *this, context, metadata.GetType(), parameter, lastObjectName);
+        *this, context, metadata.GetType(), parameter, lastObjectName, metadata.GetExtraInfo());
   } else if (ParameterMetadata::IsObject(metadata.GetType())) {
     // It would be possible to run a gd::ExpressionCodeGenerator if later
     // objects can have nested objects, or function returning objects.
@@ -695,7 +797,8 @@ gd::String EventsCodeGenerator::GenerateParameterCodes(
   } else if (metadata.GetType() == "operator") {
     argOutput += parameter.GetPlainString();
     if (argOutput != "=" && argOutput != "+" && argOutput != "-" &&
-        argOutput != "/" && argOutput != "*") {
+        argOutput != "/" && argOutput != "*" && argOutput != "True" &&
+        argOutput != "False" && argOutput != "Toggle") {
       cout << "Warning: Bad operator: Set to = by default." << endl;
       argOutput = "=";
     }
@@ -865,6 +968,11 @@ gd::String EventsCodeGenerator::GenerateEventsListCode(
     gd::EventsList& events, EventsCodeGenerationContext& parentContext) {
   gd::String output;
   for (std::size_t eId = 0; eId < events.size(); ++eId) {
+    auto& event = events[eId];
+    if (event.HasVariables()) {
+      GetProjectScopedContainers().GetVariablesContainersList().Push(event.GetVariables());
+    }
+
     // Each event has its own context : Objects picked in an event are totally
     // different than the one picked in another.
     gd::EventsCodeGenerationContext newContext;
@@ -885,13 +993,17 @@ gd::String EventsCodeGenerator::GenerateEventsListCode(
 
     auto& context = reuseParentContext ? reusedContext : newContext;
 
-    gd::String eventCoreCode = events[eId].GenerateEventCode(*this, context);
+    gd::String eventCoreCode = event.GenerateEventCode(*this, context);
     gd::String scopeBegin = GenerateScopeBegin(context);
     gd::String scopeEnd = GenerateScopeEnd(context);
     gd::String declarationsCode = GenerateObjectsDeclarationCode(context);
 
     output += "\n" + scopeBegin + "\n" + declarationsCode + "\n" +
               eventCoreCode + "\n" + scopeEnd + "\n";
+    
+    if (event.HasVariables()) {
+      GetProjectScopedContainers().GetVariablesContainersList().Pop();
+    }
   }
 
   return output;
@@ -1067,7 +1179,8 @@ gd::String EventsCodeGenerator::GenerateFreeAction(
   // Generate call
   gd::String call;
   if (instrInfos.codeExtraInformation.type == "number" ||
-      instrInfos.codeExtraInformation.type == "string") {
+      instrInfos.codeExtraInformation.type == "string" || 
+      instrInfos.codeExtraInformation.type == "boolean") {
     if (instrInfos.codeExtraInformation.accessType ==
         gd::InstructionMetadata::ExtraInformation::MutatorAndOrAccessor)
       call = GenerateOperatorCall(
@@ -1251,7 +1364,8 @@ EventsCodeGenerator::EventsCodeGenerator(const gd::Project& project_,
       compilationForRuntime(false),
       maxCustomConditionsDepth(0),
       maxConditionsListsSize(0),
-      eventsListNextUniqueId(0){};
+      eventsListNextUniqueId(0),
+      diagnosticReport(nullptr){};
 
 EventsCodeGenerator::EventsCodeGenerator(
     const gd::Platform& platform_,
@@ -1265,6 +1379,7 @@ EventsCodeGenerator::EventsCodeGenerator(
       compilationForRuntime(false),
       maxCustomConditionsDepth(0),
       maxConditionsListsSize(0),
-      eventsListNextUniqueId(0){};
+      eventsListNextUniqueId(0),
+      diagnosticReport(nullptr){};
 
 }  // namespace gd

Core/GDCore/Events/CodeGeneration/EventsCodeGenerator.h

@@ -3,8 +3,7 @@
  * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_EVENTSCODEGENERATOR_H
-#define GDCORE_EVENTSCODEGENERATOR_H
+#pragma once
 
 #include <set>
 #include <utility>
@@ -12,8 +11,10 @@
 
 #include "GDCore/Events/Event.h"
 #include "GDCore/Events/Instruction.h"
+#include "GDCore/Events/CodeGeneration/DiagnosticReport.h"
 #include "GDCore/Project/ProjectScopedContainers.h"
 #include "GDCore/String.h"
+
 namespace gd {
 class EventsList;
 class Expression;
@@ -336,6 +337,16 @@ class GD_CORE_API EventsCodeGenerator {
     return projectScopedContainers;
   }
 
+  /**
+   * @brief Give access to the project scoped containers as code generation might
+   * push and pop variable containers (for local variables).
+   * This could be passed as a parameter recursively in code generation, but this requires
+   * heavy refactoring. Instead, we use this single instance.
+   */
+  gd::ProjectScopedContainers& GetProjectScopedContainers() {
+    return projectScopedContainers;
+  }
+
   /**
    * \brief Return true if the code generation is done for a given project and
    * layout. If not, this means that the code is generated for a function.
@@ -372,6 +383,14 @@ class GD_CORE_API EventsCodeGenerator {
    */
   size_t GetMaxConditionsListsSize() const { return maxConditionsListsSize; }
 
+  void SetDiagnosticReport(gd::DiagnosticReport* diagnosticReport_) {
+    diagnosticReport = diagnosticReport_;
+  }
+
+  gd::DiagnosticReport* GetDiagnosticReport() {
+    return diagnosticReport;
+  }
+
   /**
    * \brief Generate the full name for accessing to a boolean variable used for
    * conditions.
@@ -448,7 +467,7 @@ class GD_CORE_API EventsCodeGenerator {
    */
   virtual gd::String GetCodeNamespace() { return ""; };
 
-  enum VariableScope { LAYOUT_VARIABLE = 0, PROJECT_VARIABLE, OBJECT_VARIABLE };
+  enum VariableScope { LAYOUT_VARIABLE = 0, PROJECT_VARIABLE, OBJECT_VARIABLE, ANY_VARIABLE };
 
   /**
    * Generate a single unique number for the specified instruction.
@@ -478,7 +497,20 @@ class GD_CORE_API EventsCodeGenerator {
       const gd::String& lhs,
       const gd::String& rhs);
 
- protected:
+  /**
+   * \brief Generate the code to access the local variables stack.
+   */
+  virtual gd::String GenerateLocalVariablesStackAccessor();
+
+  /**
+   * \brief Generate an any variable getter that fallbacks on scene variable for
+   * compatibility reason.
+   */
+  gd::String
+  GenerateAnyOrSceneVariableGetter(const gd::Expression &variableExpression,
+                                   EventsCodeGenerationContext &context);
+
+protected:
   virtual const gd::String GenerateRelationalOperatorCodes(
       const gd::String& operatorString);
 
@@ -534,11 +566,15 @@ class GD_CORE_API EventsCodeGenerator {
       const VariableScope& scope,
       gd::EventsCodeGenerationContext& context,
       const gd::String& objectName) {
+    // This code is only used as a mock.
+    // See the real implementation in GDJS.
     if (scope == LAYOUT_VARIABLE) {
       return "getLayoutVariable(" + variableName + ")";
 
     } else if (scope == PROJECT_VARIABLE) {
       return "getProjectVariable(" + variableName + ")";
+    } else if (scope == ANY_VARIABLE) {
+      return "getAnyVariable(" + variableName + ")";
     }
 
     return "getVariableForObject(" + objectName + ", " + variableName + ")";
@@ -779,6 +815,10 @@ class GD_CORE_API EventsCodeGenerator {
   virtual gd::String GenerateGetBehaviorNameCode(
       const gd::String& behaviorName);
 
+  void CheckBehaviorParameters(
+      const gd::Instruction &instruction,
+      const gd::InstructionMetadata &instrInfos);
+
   const gd::Platform& platform;  ///< The platform being used.
 
   gd::ProjectScopedContainers projectScopedContainers;
@@ -809,8 +849,9 @@ class GD_CORE_API EventsCodeGenerator {
       instructionUniqueIds;  ///< The unique ids generated for instructions.
   size_t eventsListNextUniqueId;  ///< The next identifier to use for an events
                                   ///< list function name.
+  
+  gd::DiagnosticReport* diagnosticReport;
 };
 
 }  // namespace gd
 
-#endif  // GDCORE_EVENTSCODEGENERATOR_H

Core/GDCore/Events/CodeGeneration/ExpressionCodeGenerator.cpp

@@ -31,6 +31,7 @@
 #include "GDCore/Project/ProjectScopedContainers.h"
 #include "GDCore/IDE/Events/ExpressionTypeFinder.h"
 #include "GDCore/IDE/Events/ExpressionVariableOwnerFinder.h"
+#include "GDCore/Events/CodeGeneration/DiagnosticReport.h"
 
 namespace gd {
 
@@ -39,7 +40,8 @@ gd::String ExpressionCodeGenerator::GenerateExpressionCode(
     EventsCodeGenerationContext& context,
     const gd::String& rootType,
     const gd::Expression& expression,
-    const gd::String& rootObjectName) {
+    const gd::String& rootObjectName,
+    const gd::String& extraInfo) {
   ExpressionCodeGenerator generator(rootType, rootObjectName, codeGenerator, context);
 
   auto node = expression.GetRootNode();
@@ -52,13 +54,34 @@ gd::String ExpressionCodeGenerator::GenerateExpressionCode(
 
   gd::ExpressionValidator validator(codeGenerator.GetPlatform(),
                                     codeGenerator.GetProjectScopedContainers(),
-                                    rootType);
+                                    rootType,
+                                    extraInfo);
   node->Visit(validator);
   if (!validator.GetFatalErrors().empty()) {
     std::cout << "Error: \"" << validator.GetFatalErrors()[0]->GetMessage()
               << "\" in: \"" << expression.GetPlainString() << "\" ("
               << rootType << ")" << std::endl;
 
+    auto *diagnosticReport = codeGenerator.GetDiagnosticReport();
+    if (diagnosticReport) {
+      for (auto *error : validator.GetFatalErrors()) {
+        if (error->GetType() ==
+                gd::ExpressionParserError::ErrorType::UndeclaredVariable ||
+            error->GetType() ==
+                gd::ExpressionParserError::ErrorType::UnknownIdentifier) {
+                  
+          const auto& variableName = error->GetActualValue();
+          if (!variableName.empty()) {
+            gd::ProjectDiagnostic projectDiagnostic(
+                gd::ProjectDiagnostic::ErrorType::UndeclaredVariable,
+                error->GetMessage(), error->GetActualValue(),
+                "", error->GetObjectName());
+            diagnosticReport->Add(projectDiagnostic);
+          }
+        }
+      }
+    }
+
     return generator.GenerateDefaultValue(rootType);
   }
 
@@ -110,11 +133,13 @@ void ExpressionCodeGenerator::OnVisitVariableNode(VariableNode& node) {
   if (gd::ParameterMetadata::IsExpression("variable", type)) {
     // The node is a variable inside an expression waiting for a *variable* to be returned, not its value.
     EventsCodeGenerator::VariableScope scope =
-        type == "globalvar"
+        type == "variable"
+            ? gd::EventsCodeGenerator::ANY_VARIABLE
+        : type == "globalvar"
             ? gd::EventsCodeGenerator::PROJECT_VARIABLE
-            : ((type == "scenevar")
+            : type == "scenevar"
                   ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
-                  : gd::EventsCodeGenerator::OBJECT_VARIABLE);
+                  : gd::EventsCodeGenerator::OBJECT_VARIABLE;
 
     auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(codeGenerator.GetPlatform(),
                                           codeGenerator.GetObjectsContainersList(),
@@ -137,19 +162,8 @@ void ExpressionCodeGenerator::OnVisitVariableNode(VariableNode& node) {
 
       output += codeGenerator.GenerateVariableValueAs(type);
     }, [&]() {
-      if (!codeGenerator.HasProjectAndLayout()) {
-        gd::LogWarning("Tried to generate access to a variable without a project/scene - the code generator only works for global and scene variables for now.");
-        output += GenerateDefaultValue(type);
-        return;
-      }
-
-      // This could be adapted in the future if more scopes are supported.
-      EventsCodeGenerator::VariableScope scope = gd::EventsCodeGenerator::PROJECT_VARIABLE;
-      if (codeGenerator.GetProjectScopedContainers().GetVariablesContainersList().GetBottomMostVariablesContainer()->Has(node.name)) {
-        scope = gd::EventsCodeGenerator::LAYOUT_VARIABLE;
-      }
-
-      output += codeGenerator.GenerateGetVariable(node.name, scope, context, "");
+      output += codeGenerator.GenerateGetVariable(
+          node.name, gd::EventsCodeGenerator::ANY_VARIABLE, context, "");
       if (node.child) node.child->Visit(*this);
       output += codeGenerator.GenerateVariableValueAs(type);
     }, [&]() {
@@ -209,11 +223,13 @@ void ExpressionCodeGenerator::OnVisitIdentifierNode(IdentifierNode& node) {
         codeGenerator.GenerateObject(node.identifierName, type, context);
   } else if (gd::ParameterMetadata::IsExpression("variable", type)) {
       EventsCodeGenerator::VariableScope scope =
-          type == "globalvar"
+        type == "variable"
+            ? gd::EventsCodeGenerator::ANY_VARIABLE
+        : type == "globalvar"
               ? gd::EventsCodeGenerator::PROJECT_VARIABLE
-              : ((type == "scenevar")
+              : type == "scenevar"
                     ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
-                    : gd::EventsCodeGenerator::OBJECT_VARIABLE);
+                    : gd::EventsCodeGenerator::OBJECT_VARIABLE;
 
       auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(codeGenerator.GetPlatform(),
                                             codeGenerator.GetObjectsContainersList(),
@@ -236,19 +252,9 @@ void ExpressionCodeGenerator::OnVisitIdentifierNode(IdentifierNode& node) {
         node.childIdentifierName, gd::EventsCodeGenerator::OBJECT_VARIABLE, context, node.identifierName);
       output += codeGenerator.GenerateVariableValueAs(type);
     }, [&]() {
-      if (!codeGenerator.HasProjectAndLayout()) {
-        gd::LogWarning("Tried to generate access to a variable without a project/scene - the code generator only works for global and scene variables for now.");
-        output += GenerateDefaultValue(type);
-        return;
-      }
-
-      // This could be adapted in the future if more scopes are supported at runtime.
-      EventsCodeGenerator::VariableScope scope = gd::EventsCodeGenerator::PROJECT_VARIABLE;
-      if (variablesContainersList.GetBottomMostVariablesContainer()->Has(node.identifierName)) {
-        scope = gd::EventsCodeGenerator::LAYOUT_VARIABLE;
-      }
-
-      output += codeGenerator.GenerateGetVariable(node.identifierName, scope, context, "");
+      output += codeGenerator.GenerateGetVariable(
+          node.identifierName, gd::EventsCodeGenerator::ANY_VARIABLE, context,
+          "");
       if (!node.childIdentifierName.empty()) {
         output += codeGenerator.GenerateVariableAccessor(node.childIdentifierName);
       }

Core/GDCore/Events/CodeGeneration/ExpressionCodeGenerator.h

@@ -59,7 +59,8 @@ class GD_CORE_API ExpressionCodeGenerator : public ExpressionParser2NodeWorker {
                                            EventsCodeGenerationContext& context,
                                            const gd::String& type,
                                            const gd::Expression& expression,
-                                           const gd::String& objectName = "");
+                                           const gd::String& objectName = "",
+                                           const gd::String& extraInfo = "");
 
   const gd::String& GetOutput() { return output; };
 

Core/GDCore/Events/Event.cpp

@@ -17,6 +17,7 @@
 namespace gd {
 
 EventsList BaseEvent::badSubEvents;
+VariablesContainer BaseEvent::badLocalVariables;
 std::vector<gd::String> BaseEvent::emptyDependencies;
 gd::String BaseEvent::emptySourceFile;
 
@@ -28,6 +29,8 @@ BaseEvent::BaseEvent()
 
 bool BaseEvent::HasSubEvents() const { return !GetSubEvents().IsEmpty(); }
 
+bool BaseEvent::HasVariables() const { return GetVariables().Count() > 0; }
+
 gd::String BaseEvent::GenerateEventCode(
     gd::EventsCodeGenerator& codeGenerator,
     gd::EventsCodeGenerationContext& context) {

Core/GDCore/Events/Event.h

@@ -3,9 +3,7 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#if defined(GD_IDE_ONLY)
-#ifndef GDCORE_EVENT_H
-#define GDCORE_EVENT_H
+#pragma once
 
 #include <iostream>
 #include <memory>
@@ -26,6 +24,7 @@ class SerializerElement;
 class Instruction;
 class EventVisitor;
 class ReadOnlyEventVisitor;
+class VariablesContainer;
 }  // namespace gd
 
 namespace gd {
@@ -92,6 +91,32 @@ class GD_CORE_API BaseEvent {
    */
   bool HasSubEvents() const;
 
+  /**
+   * Derived class have to redefine this function, so as to return true, if they
+   * can have local variables.
+   */
+  virtual bool CanHaveVariables() const { return false; }
+
+  /**
+   * Return the local variables, if applicable.
+   */
+  virtual const gd::VariablesContainer& GetVariables() const {
+    return badLocalVariables;
+  };
+
+  /**
+   * Return the local variables, if applicable.
+   */
+  virtual gd::VariablesContainer& GetVariables() {
+    return badLocalVariables;
+  };
+
+  /**
+   * \brief Return true if the events has local variables.
+   * \warning This is only applicable when CanHaveVariables() return true.
+   */
+  bool HasVariables() const;
+
   /**
    * \brief Return a list of all conditions of the event.
    * \note Used to preprocess or search in the conditions.
@@ -301,6 +326,7 @@ class GD_CORE_API BaseEvent {
                     ///< Used for saving the event for instance.
 
   static gd::EventsList badSubEvents;
+  static gd::VariablesContainer badLocalVariables;
   static std::vector<gd::String> emptyDependencies;
   static gd::String emptySourceFile;
 };
@@ -325,6 +351,3 @@ class EmptyEvent : public BaseEvent {
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_EVENT_H
-#endif

Core/GDCore/Events/Parsers/ExpressionParser2.h

@@ -38,7 +38,7 @@ using namespace gd::GrammarTerminals;
  * parser by refactoring out the dependency on gd::MetadataProvider (injecting
  * instead functions to be called to query supported functions).
  *
- * \see gd::ExpressionParserDiagnostic
+ * \see gd::ExpressionParserError
  * \see gd::ExpressionNode
  */
 class GD_CORE_API ExpressionParser2 {
@@ -547,28 +547,28 @@ class GD_CORE_API ExpressionParser2 {
   }
   ///@}
 
-  std::unique_ptr<ExpressionParserDiagnostic> ValidateOperator(
+  std::unique_ptr<ExpressionParserError> ValidateOperator(
       gd::String::value_type operatorChar) {
     if (operatorChar == '+' || operatorChar == '-' || operatorChar == '/' ||
         operatorChar == '*') {
-      return gd::make_unique<ExpressionParserDiagnostic>();
+      return std::unique_ptr<ExpressionParserError>(nullptr);
     }
     return gd::make_unique<ExpressionParserError>(
-        "invalid_operator",
+        gd::ExpressionParserError::ErrorType::InvalidOperator,
         _("You've used an operator that is not supported. Operator should be "
           "either +, -, / or *."),
         GetCurrentPosition());
   }
 
-  std::unique_ptr<ExpressionParserDiagnostic> ValidateUnaryOperator(
+  std::unique_ptr<ExpressionParserError> ValidateUnaryOperator(
       gd::String::value_type operatorChar,
       size_t position) {
     if (operatorChar == '+' || operatorChar == '-') {
-      return gd::make_unique<ExpressionParserDiagnostic>();
+      return std::unique_ptr<ExpressionParserError>(nullptr);
     }
 
     return gd::make_unique<ExpressionParserError>(
-        "invalid_operator",
+        gd::ExpressionParserError::ErrorType::InvalidOperator,
         _("You've used an \"unary\" operator that is not supported. Operator "
           "should be "
           "either + or -."),
@@ -719,13 +719,15 @@ class GD_CORE_API ExpressionParser2 {
   std::unique_ptr<ExpressionParserError> RaiseSyntaxError(
       const gd::String &message) {
     return std::move(gd::make_unique<ExpressionParserError>(
-        "syntax_error", message, GetCurrentPosition()));
+        gd::ExpressionParserError::ErrorType::SyntaxError, message,
+        GetCurrentPosition()));
   }
 
   std::unique_ptr<ExpressionParserError> RaiseTypeError(
       const gd::String &message, size_t beginningPosition) {
     return std::move(gd::make_unique<ExpressionParserError>(
-        "type_error", message, beginningPosition, GetCurrentPosition()));
+        gd::ExpressionParserError::ErrorType::MismatchedType, message,
+        beginningPosition, GetCurrentPosition()));
   }
   ///@}
 

Core/GDCore/Events/Parsers/ExpressionParser2Node.cpp

@@ -6,5 +6,5 @@
 #include "ExpressionParser2Node.h"
 
 namespace gd {
-gd::String ExpressionParserDiagnostic::noMessage = "";
+
 }

Core/GDCore/Events/Parsers/ExpressionParser2Node.h

@@ -3,14 +3,14 @@
  * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_EXPRESSIONPARSER2NODES_H
-#define GDCORE_EXPRESSIONPARSER2NODES_H
+#pragma once
 
 #include <memory>
 #include <vector>
 
 #include "ExpressionParser2NodeWorker.h"
 #include "GDCore/String.h"
+
 namespace gd {
 class Expression;
 class ObjectsContainer;
@@ -40,50 +40,57 @@ struct GD_CORE_API ExpressionParserLocation {
   size_t endPosition;
 };
 
-/**
- * \brief A diagnostic that can be attached to a gd::ExpressionNode.
- */
-struct GD_CORE_API ExpressionParserDiagnostic {
-  virtual ~ExpressionParserDiagnostic() = default;
-  virtual bool IsError() { return false; }
-  virtual const gd::String &GetMessage() { return noMessage; }
-  virtual size_t GetStartPosition() { return 0; }
-  virtual size_t GetEndPosition() { return 0; }
-
- private:
-  static gd::String noMessage;
-};
-
 /**
  * \brief An error that can be attached to a gd::ExpressionNode.
  */
-struct GD_CORE_API ExpressionParserError : public ExpressionParserDiagnostic {
-  ExpressionParserError(const gd::String &type_,
+struct GD_CORE_API ExpressionParserError {
+  enum ErrorType {
+    SyntaxError,
+    InvalidOperator,
+    MismatchedType,
+    UndeclaredVariable,
+    UnknownIdentifier,
+    BracketsNotAllowedForObjects,
+    TooFewParameters,
+    TooManyParameters,
+    InvalidFunctionName,
+    MalformedVariableParameter,
+    MalformedObjectParameter,
+    UnknownParameterType,
+    MissingBehavior,
+    VariableNameCollision,
+  };
+
+  ExpressionParserError(gd::ExpressionParserError::ErrorType type_,
                         const gd::String &message_,
-                        const ExpressionParserLocation &location_)
-      : type(type_), message(message_), location(location_){};
-  ExpressionParserError(const gd::String &type_,
-                        const gd::String &message_,
-                        size_t position_)
+                        const ExpressionParserLocation &location_,
+                        const gd::String &actualValue_ = "",
+                        const gd::String &objectName_ = "")
+      : type(type_), message(message_), location(location_),
+        actualValue(actualValue_), objectName(objectName_){};
+  ExpressionParserError(gd::ExpressionParserError::ErrorType type_,
+                        const gd::String &message_, size_t position_)
       : type(type_), message(message_), location(position_){};
-  ExpressionParserError(const gd::String &type_,
-                        const gd::String &message_,
-                        size_t startPosition_,
+  ExpressionParserError(gd::ExpressionParserError::ErrorType type_,
+                        const gd::String &message_, size_t startPosition_,
                         size_t endPosition_)
-      : type(type_),
-        message(message_),
+      : type(type_), message(message_),
         location(startPosition_, endPosition_){};
   virtual ~ExpressionParserError(){};
 
-  bool IsError() override { return true; }
-  const gd::String &GetMessage() override { return message; }
-  size_t GetStartPosition() override { return location.GetStartPosition(); }
-  size_t GetEndPosition() override { return location.GetEndPosition(); }
+  gd::ExpressionParserError::ErrorType GetType() { return type; }
+  const gd::String &GetMessage() { return message; }
+  const gd::String &GetObjectName() { return objectName; }
+  const gd::String &GetActualValue() { return actualValue; }
+  size_t GetStartPosition() { return location.GetStartPosition(); }
+  size_t GetEndPosition() { return location.GetEndPosition(); }
 
- private:
-  gd::String type;
+private:
+  gd::ExpressionParserError::ErrorType type;
   gd::String message;
   ExpressionParserLocation location;
+  gd::String objectName;
+  gd::String actualValue;
 };
 
 /**
@@ -95,7 +102,7 @@ struct GD_CORE_API ExpressionNode {
   virtual ~ExpressionNode(){};
   virtual void Visit(ExpressionParser2NodeWorker &worker){};
 
-  std::unique_ptr<ExpressionParserDiagnostic> diagnostic;
+  std::unique_ptr<ExpressionParserError> diagnostic;
   ExpressionParserLocation location;  ///< The location of the entire node. Some
                                       /// nodes might have other locations
                                       /// stored inside them. For example, a
@@ -425,5 +432,3 @@ struct GD_CORE_API EmptyNode : public FunctionCallOrObjectFunctionNameOrEmptyNod
 };
 
 }  // namespace gd
-
-#endif

Core/GDCore/Extensions/Builtin/AdvancedExtension.cpp

@@ -66,6 +66,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAdvancedExtension(
       .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
+  // Deprecated
   extension
       .AddAction("CopyArgumentToVariable",
                  _("Copy function parameter to variable"),
@@ -78,9 +79,25 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAdvancedExtension(
       .SetHelpPath("/events/functions/return")
       .AddParameter("functionParameterName", _("Parameter name"), "variable")
       .AddParameter("scenevar", _("Scene variable"))
+      .SetHidden()
+      .MarkAsAdvanced();
+
+  extension
+      .AddAction("CopyArgumentToVariable2",
+                 _("Copy function parameter to variable"),
+                 _("Copy a function parameter (also called \"argument\") to a variable. "
+                 "The parameter type must be a variable."),
+                 _("Copy the parameter _PARAM0_ into the variable _PARAM1_"),
+                 "",
+                 "res/function32.png",
+                 "res/function32.png")
+      .SetHelpPath("/events/functions/return")
+      .AddParameter("functionParameterName", _("Parameter name"), "variable")
+      .AddParameter("variable", _("Variable"))
       .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
+  // Deprecated
   extension
       .AddAction("CopyVariableToArgument",
                  _("Copy variable to function parameter"),
@@ -93,6 +110,21 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAdvancedExtension(
       .SetHelpPath("/events/functions/return")
       .AddParameter("functionParameterName", _("Parameter name"), "variable")
       .AddParameter("scenevar", _("Scene variable"))
+      .SetHidden()
+      .MarkAsAdvanced();
+
+  extension
+      .AddAction("CopyVariableToArgument2",
+                 _("Copy variable to function parameter"),
+                 _("Copy a variable to function parameter (also called \"argument\"). "
+                 "The parameter type must be a variable."),
+                 _("Copy the variable _PARAM1_ into the parameter _PARAM0_"),
+                 "",
+                 "res/function32.png",
+                 "res/function32.png")
+      .SetHelpPath("/events/functions/return")
+      .AddParameter("functionParameterName", _("Parameter name"), "variable")
+      .AddParameter("variable", _("Variable"))
       .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 

Core/GDCore/Extensions/Builtin/BaseObjectExtension.cpp

@@ -417,6 +417,93 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .SetDefaultValue("\"\"")
       .MarkAsAdvanced();
 
+  obj.AddAction("SetNumberObjectVariable",
+                _("Change variable value"),
+                _("Modify the number value of an object variable."),
+                _("the variable _PARAM1_"),
+                _("Variables"),
+                "res/actions/var24.png",
+                "res/actions/var.png")
+
+      .AddParameter("object", _("Object"))
+      .AddParameter("objectvar", _("Variable"))
+      .UseStandardOperatorParameters("number",
+                                     ParameterOptions::MakeNewOptions())
+      .SetRelevantForLayoutEventsOnly();
+
+  obj.AddAction("SetStringObjectVariable",
+                _("Change text variable"),
+                _("Modify the text of an object variable."),
+                _("the variable _PARAM1_"),
+                _("Variables"),
+                "res/actions/var24.png",
+                "res/actions/var.png")
+
+      .AddParameter("object", _("Object"))
+      .AddParameter("objectvar", _("Variable"))
+      .UseStandardOperatorParameters("string",
+                                     ParameterOptions::MakeNewOptions())
+      .SetRelevantForLayoutEventsOnly();
+
+  obj.AddAction("SetBooleanObjectVariable",
+                _("Change boolean variable"),
+                _("Modify the boolean value of an object variable."),
+                _("Change the variable _PARAM1_ of _PARAM0_: _PARAM2_"),
+                _("Variables"),
+                "res/actions/var24.png",
+                "res/actions/var.png")
+      .AddParameter("object", _("Object"))
+      .AddParameter("objectvar", _("Variable"))
+      .AddParameter("operator", _("Value"), "boolean")
+      // This parameter allows to keep the operand expression
+      // when the editor switch between variable instructions.
+      .AddCodeOnlyParameter("yesorno", _("Value"))
+      .SetRelevantForLayoutEventsOnly();
+
+  obj.AddCondition("NumberObjectVariable",
+                   _("Variable value"),
+                   _("Compare the number value of an object variable."),
+                   _("the variable _PARAM1_"),
+                   _("Variables"),
+                   "res/conditions/var24.png",
+                   "res/conditions/var.png")
+
+      .AddParameter("object", _("Object"))
+      .AddParameter("objectvar", _("Variable"))
+      .UseStandardRelationalOperatorParameters(
+          "number", ParameterOptions::MakeNewOptions())
+      .SetRelevantForLayoutEventsOnly();
+
+  obj.AddCondition("StringObjectVariable",
+                   _("Text variable"),
+                   _("Compare the text of an object variable."),
+                   _("the variable _PARAM1_"),
+                   _("Variables"),
+                   "res/conditions/var24.png",
+                   "res/conditions/var.png")
+
+      .AddParameter("object", _("Object"))
+      .AddParameter("objectvar", _("Variable"))
+      .UseStandardRelationalOperatorParameters(
+          "string", ParameterOptions::MakeNewOptions())
+      .SetRelevantForLayoutEventsOnly();
+
+  obj.AddCondition("BooleanObjectVariable",
+                   _("Boolean variable"),
+                   _("Compare the boolean value of an object variable."),
+                   _("The variable _PARAM1_ of _PARAM0_ is _PARAM2_"),
+                   _("Variables"),
+                   "res/conditions/var24.png",
+                   "res/conditions/var.png")
+      .AddParameter("object", _("Object"))
+      .AddParameter("objectvar", _("Variable"))
+      .AddParameter("trueorfalse", _("Check if the value is"))
+      .SetDefaultValue("true")
+      // This parameter allows to keep the operand expression
+      // when the editor switch between variable instructions.
+      .AddCodeOnlyParameter("yesorno", _("Value"))
+      .SetRelevantForLayoutEventsOnly();
+
   obj.AddAction("ModVarObjet",
                 _("Change number variable"),
                 _("Modify the number value of an object variable."),
@@ -428,7 +515,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .UseStandardOperatorParameters("number",
-                                     ParameterOptions::MakeNewOptions());
+                                     ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction("ModVarObjetTxt",
                 _("Change text variable"),
@@ -441,7 +529,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .UseStandardOperatorParameters("string",
-                                     ParameterOptions::MakeNewOptions());
+                                     ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction("SetObjectVariableAsBoolean",
                 _("Change boolean variable"),
@@ -454,7 +543,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
 
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
-      .AddParameter("trueorfalse", _("New Value:"));
+      .AddParameter("trueorfalse", _("New Value:"))
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction(
          "ToggleObjectVariableAsBoolean",
@@ -469,7 +559,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          "res/actions/var.png")
 
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Variable"));
+      .AddParameter("objectvar", _("Variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("ObjectVariableChildExists",
                    _("Child existence"),
@@ -657,7 +748,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
-          "number", ParameterOptions::MakeNewOptions());
+          "number", ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("VarObjetTxt",
                    _("Text variable"),
@@ -670,7 +762,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
-          "string", ParameterOptions::MakeNewOptions());
+          "string", ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("ObjectVariableAsBoolean",
                    _("Boolean variable"),
@@ -683,7 +776,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .AddParameter("trueorfalse", _("Check if the value is"))
-      .SetDefaultValue("true");
+      .SetDefaultValue("true")
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("VarObjetDef",
                    "Variable defined",
@@ -697,6 +791,48 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("string", _("Variable"))
       .SetHidden();  // Deprecated.
 
+  obj.AddAction(
+         "PushStringToObjectVariable",
+         _("Add text variable"),
+         _("Adds a text (string) to the end of an object array variable."),
+         _("Add value _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
+         _("Variables/Arrays and structures"),
+         "res/actions/var24.png",
+         "res/actions/var.png")
+      .AddParameter("object", _("Object"))
+      .AddParameter("objectvar", _("Array variable"))
+      .AddParameter("string", _("Text to add"))
+      .MarkAsAdvanced()
+      .SetRelevantForLayoutEventsOnly();
+
+  obj.AddAction("PushNumberToObjectVariable",
+                _("Add variable array value"),
+                _("Adds a number to the end of an object array variable."),
+                _("Add value _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
+                _("Variables/Arrays and structures"),
+                "res/actions/var24.png",
+                "res/actions/var.png")
+      .AddParameter("object", _("Object"))
+      .AddParameter("objectvar", _("Array variable"))
+      .AddParameter("expression", _("Number to add"))
+      .MarkAsAdvanced()
+      .SetRelevantForLayoutEventsOnly();
+
+  obj.AddAction(
+         "PushBooleanToObjectVariable",
+         _("Add boolean variable"),
+         _("Adds a boolean to the end of an object array variable."),
+         _("Add value _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
+         _("Variables/Arrays and structures"),
+         "res/actions/var24.png",
+         "res/actions/var.png")
+      .AddParameter("object", _("Object"))
+      .AddParameter("objectvar", _("Array variable"))
+      .AddParameter("trueorfalse", _("Boolean to add"))
+      .MarkAsAdvanced()
+      .SetRelevantForLayoutEventsOnly();
+
+  // Deprecated
   obj.AddAction(
          "ObjectVariablePush",
          _("Add existing variable"),
@@ -708,6 +844,23 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("scenevar", _("Scene variable with the content to add"))
+      .SetParameterLongDescription(_("The content of the object variable will "
+                                     "*be copied* and added at the "
+                                     "end of the array."))
+      .MarkAsAdvanced()
+      .SetHidden();
+
+  obj.AddAction(
+         "ObjectVariablePush2",
+         _("Add existing variable"),
+         _("Adds an existing variable to the end of an object array variable."),
+         _("Add variable _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
+         _("Variables/Arrays and structures"),
+         "res/actions/var24.png",
+         "res/actions/var.png")
+      .AddParameter("object", _("Object"))
+      .AddParameter("objectvar", _("Array variable"))
+      .AddParameter("variable", _("Scene variable with the content to add"))
       .SetParameterLongDescription(_("The content of the object variable will "
                                      "*be copied* and added at the "
                                      "end of the array."))
@@ -724,7 +877,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("string", _("Text to add"))
-      .MarkAsAdvanced();
+      .MarkAsAdvanced()
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction("ObjectVariablePushNumber",
                 _("Add number variable"),
@@ -736,7 +890,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("expression", _("Number to add"))
-      .MarkAsAdvanced();
+      .MarkAsAdvanced()
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction(
          "ObjectVariablePushBool",
@@ -749,7 +904,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("trueorfalse", _("Boolean to add"))
-      .MarkAsAdvanced();
+      .MarkAsAdvanced()
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction(
          "ObjectVariableRemoveAt",
@@ -1203,7 +1359,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     _("Variables"),
                     "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Variable"));
+      .AddParameter("objectvar", _("Variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddExpression(
          "VariableChildCount",
@@ -1220,7 +1377,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                        _("Variables"),
                        "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Variable"));
+      .AddParameter("objectvar", _("Variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddExpression("ObjectTimerElapsedTime",
                     _("Object timer value"),

Core/GDCore/Extensions/Builtin/CommonConversionsExtension.cpp

@@ -68,19 +68,22 @@ BuiltinExtensionsImplementer::ImplementsCommonConversionsExtension(
 
   extension
       .AddStrExpression("ToJSON",
-                        _("Convert scene variable to JSON"),
-                        _("Convert a scene variable to JSON"),
+                        _("Convert variable to JSON"),
+                        _("Convert a variable to JSON"),
                         _("JSON"),
                         "res/conditions/toujours24_black.png")
-      .AddParameter("scenevar", _("Scene variable to be stringified"));
+      .AddParameter("variable", _("The variable to be stringified"),
+                    "AllowUndeclaredVariable");
 
+  // Deprecated
   extension
       .AddStrExpression("GlobalVarToJSON",
                         _("Convert global variable to JSON"),
                         _("Convert a global variable to JSON"),
                         _("JSON"),
                         "res/conditions/toujours24_black.png")
-      .AddParameter("globalvar", _("The global variable to be stringified"));
+      .AddParameter("globalvar", _("The global variable to be stringified"))
+      .SetHidden();
 
   extension
       .AddStrExpression("ObjectVarToJSON",
@@ -91,6 +94,7 @@ BuiltinExtensionsImplementer::ImplementsCommonConversionsExtension(
       .AddParameter("objectPtr", _("The object with the variable"))
       .AddParameter("objectvar", _("The object variable to be stringified"));
 
+  // Deprecated
   extension
       .AddAction(
           "JSONToVariableStructure",
@@ -102,8 +106,10 @@ BuiltinExtensionsImplementer::ImplementsCommonConversionsExtension(
           "res/actions/net.png")
       .AddParameter("string", _("JSON string"))
       .AddParameter("scenevar", _("Variable where store the JSON object"))
-      .MarkAsAdvanced();
+      .MarkAsAdvanced()
+      .SetHidden();
 
+  // Deprecated
   extension
       .AddAction("JSONToGlobalVariableStructure",
                  _("Convert JSON to global variable"),
@@ -116,6 +122,20 @@ BuiltinExtensionsImplementer::ImplementsCommonConversionsExtension(
       .AddParameter("string", _("JSON string"))
       .AddParameter("globalvar",
                     _("Global variable where store the JSON object"))
+      .MarkAsAdvanced()
+      .SetHidden();
+
+  extension
+      .AddAction(
+          "JSONToVariableStructure2",
+          _("Convert JSON to a variable"),
+          _("Parse a JSON object and store it into a variable"),
+          _("Convert JSON string _PARAM0_ and store it into variable _PARAM1_"),
+          "",
+          "res/actions/net24.png",
+          "res/actions/net.png")
+      .AddParameter("string", _("JSON string"))
+      .AddParameter("variable", _("Variable where to store the JSON object"))
       .MarkAsAdvanced();
 
   extension

Core/GDCore/Extensions/Builtin/FileExtension.cpp

@@ -98,6 +98,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsFileExtension(
       .AddParameter("string", _("Group"))
       .AddParameter("string", _("Text"));
 
+  // Deprecated
   extension
       .AddAction(
           "LireFichierExp",
@@ -114,8 +115,27 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsFileExtension(
       .AddParameter("string", _("Storage name"))
       .AddParameter("string", _("Group"))
       .AddCodeOnlyParameter("currentScene", "")
-      .AddParameter("scenevar", _("Scene variables"));
+      .AddParameter("scenevar", _("Scene variable"))
+      .SetHidden();
 
+  extension
+      .AddAction(
+          "ReadNumberFromStorage",
+          _("Load a value"),
+          _("Load the value saved in the specified element and store it in a "
+            "variable.\nSpecify the structure leading to the element using / "
+            "(example : Root/Level/Current)\nSpaces are forbidden in element "
+            "names."),
+          _("Load _PARAM1_ from storage _PARAM0_ and store value in _PARAM3_"),
+          "",
+          "res/actions/fichier24.png",
+          "res/actions/fichier.png")
+      .AddParameter("string", _("Storage name"))
+      .AddParameter("string", _("Group"))
+      .AddCodeOnlyParameter("currentScene", "")
+      .AddParameter("variable", _("Variable"));
+
+  // Deprecated
   extension
       .AddAction(
           "LireFichierTxt",
@@ -133,7 +153,26 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsFileExtension(
       .AddParameter("string", _("Storage name"))
       .AddParameter("string", _("Group"))
       .AddCodeOnlyParameter("currentScene", "")
-      .AddParameter("scenevar", _("Scene variables"));
+      .AddParameter("scenevar", _("Scene variable"))
+      .SetHidden();
+
+  extension
+      .AddAction(
+          "ReadStringFromStorage",
+          _("Load a text"),
+          _("Load the text saved in the specified element and store it in a "
+            "variable.\nSpecify the structure leading to the element using / "
+            "(example : Root/Level/Current)\nSpaces are forbidden in element "
+            "names."),
+          _("Load _PARAM1_ from storage _PARAM0_ and store as text in "
+            "_PARAM3_"),
+          "",
+          "res/actions/fichier24.png",
+          "res/actions/fichier.png")
+      .AddParameter("string", _("Storage name"))
+      .AddParameter("string", _("Group"))
+      .AddCodeOnlyParameter("currentScene", "")
+      .AddParameter("variable", _("Variable"));
 
   extension
       .AddAction("DeleteGroupFichier",

Core/GDCore/Extensions/Builtin/SpriteExtension/Animation.cpp

@@ -6,8 +6,6 @@
 
 #include "GDCore/Extensions/Builtin/SpriteExtension/Animation.h"
 #include <vector>
-#include "GDCore/Extensions/Builtin/SpriteExtension/Direction.h"
-#include "GDCore/Extensions/Builtin/SpriteExtension/Sprite.h"
 #include "GDCore/String.h"
 
 namespace gd {

Core/GDCore/Extensions/Builtin/SpriteExtension/Animation.h

@@ -4,13 +4,11 @@
  * reserved. This project is released under the MIT License.
  */
 
-#ifndef GDCORE_ANIMATION_H
-#define GDCORE_ANIMATION_H
+#pragma once
+
 #include <vector>
 #include "GDCore/String.h"
-namespace gd {
-class Direction;
-}
+#include "GDCore/Extensions/Builtin/SpriteExtension/Direction.h"
 
 namespace gd {
 
@@ -93,4 +91,3 @@ class GD_CORE_API Animation {
 };
 
 }  // namespace gd
-#endif  // GDCORE_ANIMATION_H

Core/GDCore/Extensions/Builtin/SpriteExtension/Direction.h

@@ -3,12 +3,12 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_DIRECTION_H
-#define GDCORE_DIRECTION_H
+#pragma once
+
 #include <vector>
 #include "GDCore/String.h"
+#include "GDCore/Extensions/Builtin/SpriteExtension/Sprite.h"
 namespace gd {
-class Sprite;
 class SerializerElement;
 }
 
@@ -142,4 +142,3 @@ class GD_CORE_API Direction {
 };
 
 }  // namespace gd
-#endif  // GDCORE_DIRECTION_H

Core/GDCore/Extensions/Builtin/SpriteExtension/SpriteAnimationList.cpp

@@ -0,0 +1,157 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+
+#include "GDCore/Extensions/Builtin/SpriteExtension/SpriteAnimationList.h"
+
+#include <algorithm>
+
+#include "GDCore/CommonTools.h"
+#include "GDCore/Extensions/Builtin/SpriteExtension/Animation.h"
+#include "GDCore/Extensions/Builtin/SpriteExtension/Direction.h"
+#include "GDCore/IDE/Project/ArbitraryResourceWorker.h"
+#include "GDCore/Project/InitialInstance.h"
+#include "GDCore/Project/Layout.h"
+#include "GDCore/Project/Object.h"
+#include "GDCore/Project/Project.h"
+#include "GDCore/Project/PropertyDescriptor.h"
+#include "GDCore/Serialization/SerializerElement.h"
+#include "GDCore/Tools/Localization.h"
+
+namespace gd {
+
+Animation SpriteAnimationList::badAnimation;
+
+SpriteAnimationList::SpriteAnimationList()
+    : adaptCollisionMaskAutomatically(true) {}
+
+SpriteAnimationList::~SpriteAnimationList(){};
+
+void SpriteAnimationList::UnserializeFrom(const gd::SerializerElement& element) {
+  adaptCollisionMaskAutomatically =
+      element.GetBoolAttribute("adaptCollisionMaskAutomatically", false);
+
+  RemoveAllAnimations();
+  const gd::SerializerElement& animationsElement =
+      element.GetChild("animations", 0, "Animations");
+  animationsElement.ConsiderAsArrayOf("animation", "Animation");
+  for (std::size_t i = 0; i < animationsElement.GetChildrenCount(); ++i) {
+    const gd::SerializerElement& animationElement =
+        animationsElement.GetChild(i);
+    Animation newAnimation;
+
+    newAnimation.useMultipleDirections = animationElement.GetBoolAttribute(
+        "useMultipleDirections", false, "typeNormal");
+    newAnimation.SetName(animationElement.GetStringAttribute("name", ""));
+
+    // Compatibility with GD <= 3.3
+    if (animationElement.HasChild("Direction")) {
+      for (std::size_t j = 0;
+           j < animationElement.GetChildrenCount("Direction");
+           ++j) {
+        Direction direction;
+        direction.UnserializeFrom(animationElement.GetChild("Direction", j));
+
+        newAnimation.SetDirectionsCount(newAnimation.GetDirectionsCount() + 1);
+        newAnimation.SetDirection(direction,
+                                  newAnimation.GetDirectionsCount() - 1);
+      }
+    }
+    // End of compatibility code
+    else {
+      const gd::SerializerElement& directionsElement =
+          animationElement.GetChild("directions");
+      directionsElement.ConsiderAsArrayOf("direction");
+      for (std::size_t j = 0; j < directionsElement.GetChildrenCount(); ++j) {
+        Direction direction;
+        direction.UnserializeFrom(directionsElement.GetChild(j));
+
+        newAnimation.SetDirectionsCount(newAnimation.GetDirectionsCount() + 1);
+        newAnimation.SetDirection(direction,
+                                  newAnimation.GetDirectionsCount() - 1);
+      }
+    }
+
+    AddAnimation(newAnimation);
+  }
+}
+
+void SpriteAnimationList::SerializeTo(gd::SerializerElement& element) const {
+  element.SetAttribute("adaptCollisionMaskAutomatically",
+                       adaptCollisionMaskAutomatically);
+
+  // Animations
+  gd::SerializerElement& animationsElement = element.AddChild("animations");
+  animationsElement.ConsiderAsArrayOf("animation");
+  for (std::size_t k = 0; k < GetAnimationsCount(); k++) {
+    gd::SerializerElement& animationElement =
+        animationsElement.AddChild("animation");
+
+    animationElement.SetAttribute("useMultipleDirections",
+                                  GetAnimation(k).useMultipleDirections);
+    animationElement.SetAttribute("name", GetAnimation(k).GetName());
+
+    gd::SerializerElement& directionsElement =
+        animationElement.AddChild("directions");
+    directionsElement.ConsiderAsArrayOf("direction");
+    for (std::size_t l = 0; l < GetAnimation(k).GetDirectionsCount(); l++) {
+      GetAnimation(k).GetDirection(l).SerializeTo(
+          directionsElement.AddChild("direction"));
+    }
+  }
+}
+
+void SpriteAnimationList::ExposeResources(gd::ArbitraryResourceWorker& worker) {
+  for (std::size_t j = 0; j < GetAnimationsCount(); j++) {
+    for (std::size_t k = 0; k < GetAnimation(j).GetDirectionsCount(); k++) {
+      for (std::size_t l = 0;
+           l < GetAnimation(j).GetDirection(k).GetSpritesCount();
+           l++) {
+        worker.ExposeImage(
+            GetAnimation(j).GetDirection(k).GetSprite(l).GetImageName());
+      }
+    }
+  }
+}
+
+const Animation& SpriteAnimationList::GetAnimation(std::size_t nb) const {
+  if (nb >= animations.size()) return badAnimation;
+
+  return animations[nb];
+}
+
+Animation& SpriteAnimationList::GetAnimation(std::size_t nb) {
+  if (nb >= animations.size()) return badAnimation;
+
+  return animations[nb];
+}
+
+void SpriteAnimationList::AddAnimation(const Animation& animation) {
+  animations.push_back(animation);
+}
+
+bool SpriteAnimationList::RemoveAnimation(std::size_t nb) {
+  if (nb >= GetAnimationsCount()) return false;
+
+  animations.erase(animations.begin() + nb);
+  return true;
+}
+
+void SpriteAnimationList::SwapAnimations(std::size_t firstIndex,
+                                  std::size_t secondIndex) {
+  if (firstIndex < animations.size() && secondIndex < animations.size() &&
+      firstIndex != secondIndex)
+    std::swap(animations[firstIndex], animations[secondIndex]);
+}
+
+void SpriteAnimationList::MoveAnimation(std::size_t oldIndex, std::size_t newIndex) {
+  if (oldIndex >= animations.size() || newIndex >= animations.size()) return;
+
+  auto animation = animations[oldIndex];
+  animations.erase(animations.begin() + oldIndex);
+  animations.insert(animations.begin() + newIndex, animation);
+}
+
+}  // namespace gd

Core/GDCore/Extensions/Builtin/SpriteExtension/SpriteAnimationList.h

@@ -0,0 +1,119 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+
+#pragma once
+
+#include "GDCore/Extensions/Builtin/SpriteExtension/Animation.h"
+
+namespace gd {
+class InitialInstance;
+class SerializerElement;
+class PropertyDescriptor;
+class ArbitraryResourceWorker;
+}  // namespace gd
+
+namespace gd {
+
+/**
+ * \brief A list of animations, containing directions with images and collision mask.
+ * 
+ * It's used in the configuration of object that implements image-based animations.
+ *
+ * \see Animation
+ * \see Direction
+ * \see Sprite
+ * \ingroup SpriteObjectExtension
+ */
+class GD_CORE_API SpriteAnimationList {
+ public:
+  SpriteAnimationList();
+  virtual ~SpriteAnimationList();
+
+  void ExposeResources(gd::ArbitraryResourceWorker& worker);
+
+  /**
+   * \brief Return the animation at the specified index.
+   * If the index is out of bound, a "bad animation" object is returned.
+   */
+  const Animation& GetAnimation(std::size_t nb) const;
+
+  /**
+   * \brief Return the animation at the specified index.
+   * If the index is out of bound, a "bad animation" object is returned.
+   */
+  Animation& GetAnimation(std::size_t nb);
+
+  /**
+   * \brief Return the number of animations this object has.
+   */
+  std::size_t GetAnimationsCount() const { return animations.size(); };
+
+  /**
+   * \brief Add an animation at the end of the existing ones.
+   */
+  void AddAnimation(const Animation& animation);
+
+  /**
+   * \brief Remove an animation.
+   */
+  bool RemoveAnimation(std::size_t nb);
+
+  /**
+   * \brief Remove all animations.
+   */
+  void RemoveAllAnimations() { animations.clear(); }
+
+  /**
+   * \brief Return true if the object hasn't any animation.
+   */
+  bool HasNoAnimations() const { return animations.empty(); }
+
+  /**
+   * \brief Swap the position of two animations
+   */
+  void SwapAnimations(std::size_t firstIndex, std::size_t secondIndex);
+
+  /**
+   * \brief Change the position of the specified animation
+   */
+  void MoveAnimation(std::size_t oldIndex, std::size_t newIndex);
+
+  /**
+   * \brief Return a read-only reference to the vector containing all the
+   * animation of the object.
+   */
+  const std::vector<Animation>& GetAllAnimations() const { return animations; }
+
+  /**
+   * @brief Check if the collision mask adapts automatically to the animation.
+   */
+  bool AdaptCollisionMaskAutomatically() const {
+    return adaptCollisionMaskAutomatically;
+  }
+
+  /**
+   * @brief Set if the collision mask adapts automatically to the animation.
+   */
+  void SetAdaptCollisionMaskAutomatically(bool enable) {
+    adaptCollisionMaskAutomatically = enable;
+  }
+
+  void UnserializeFrom(const gd::SerializerElement& element);
+  void SerializeTo(gd::SerializerElement& element) const;
+
+ private:
+
+  mutable std::vector<Animation> animations;
+
+  static Animation badAnimation;         //< Bad animation when an out of bound
+                                         // animation is requested.
+  bool adaptCollisionMaskAutomatically;  ///< If set to true, the collision
+                                         ///< mask will be automatically
+                                         ///< adapted to the animation of the
+                                         ///< object.
+};
+
+}  // namespace gd

Core/GDCore/Extensions/Builtin/SpriteExtension/SpriteObject.cpp

@@ -23,88 +23,20 @@
 
 namespace gd {
 
-Animation SpriteObject::badAnimation;
-
 SpriteObject::SpriteObject()
-    : updateIfNotVisible(false), adaptCollisionMaskAutomatically(true) {}
+    : updateIfNotVisible(false) {}
 
 SpriteObject::~SpriteObject(){};
 
 void SpriteObject::DoUnserializeFrom(gd::Project& project,
                                      const gd::SerializerElement& element) {
   updateIfNotVisible = element.GetBoolAttribute("updateIfNotVisible", true);
-  adaptCollisionMaskAutomatically =
-      element.GetBoolAttribute("adaptCollisionMaskAutomatically", false);
-
-  RemoveAllAnimations();
-  const gd::SerializerElement& animationsElement =
-      element.GetChild("animations", 0, "Animations");
-  animationsElement.ConsiderAsArrayOf("animation", "Animation");
-  for (std::size_t i = 0; i < animationsElement.GetChildrenCount(); ++i) {
-    const gd::SerializerElement& animationElement =
-        animationsElement.GetChild(i);
-    Animation newAnimation;
-
-    newAnimation.useMultipleDirections = animationElement.GetBoolAttribute(
-        "useMultipleDirections", false, "typeNormal");
-    newAnimation.SetName(animationElement.GetStringAttribute("name", ""));
-
-    // Compatibility with GD <= 3.3
-    if (animationElement.HasChild("Direction")) {
-      for (std::size_t j = 0;
-           j < animationElement.GetChildrenCount("Direction");
-           ++j) {
-        Direction direction;
-        direction.UnserializeFrom(animationElement.GetChild("Direction", j));
-
-        newAnimation.SetDirectionsCount(newAnimation.GetDirectionsCount() + 1);
-        newAnimation.SetDirection(direction,
-                                  newAnimation.GetDirectionsCount() - 1);
-      }
-    }
-    // End of compatibility code
-    else {
-      const gd::SerializerElement& directionsElement =
-          animationElement.GetChild("directions");
-      directionsElement.ConsiderAsArrayOf("direction");
-      for (std::size_t j = 0; j < directionsElement.GetChildrenCount(); ++j) {
-        Direction direction;
-        direction.UnserializeFrom(directionsElement.GetChild(j));
-
-        newAnimation.SetDirectionsCount(newAnimation.GetDirectionsCount() + 1);
-        newAnimation.SetDirection(direction,
-                                  newAnimation.GetDirectionsCount() - 1);
-      }
-    }
-
-    AddAnimation(newAnimation);
-  }
+  animations.UnserializeFrom(element);
 }
 
 void SpriteObject::DoSerializeTo(gd::SerializerElement& element) const {
   element.SetAttribute("updateIfNotVisible", updateIfNotVisible);
-  element.SetAttribute("adaptCollisionMaskAutomatically",
-                       adaptCollisionMaskAutomatically);
-
-  // Animations
-  gd::SerializerElement& animationsElement = element.AddChild("animations");
-  animationsElement.ConsiderAsArrayOf("animation");
-  for (std::size_t k = 0; k < GetAnimationsCount(); k++) {
-    gd::SerializerElement& animationElement =
-        animationsElement.AddChild("animation");
-
-    animationElement.SetAttribute("useMultipleDirections",
-                                  GetAnimation(k).useMultipleDirections);
-    animationElement.SetAttribute("name", GetAnimation(k).GetName());
-
-    gd::SerializerElement& directionsElement =
-        animationElement.AddChild("directions");
-    directionsElement.ConsiderAsArrayOf("direction");
-    for (std::size_t l = 0; l < GetAnimation(k).GetDirectionsCount(); l++) {
-      GetAnimation(k).GetDirection(l).SerializeTo(
-          directionsElement.AddChild("direction"));
-    }
-  }
+  animations.SerializeTo(element);
 }
 
 std::map<gd::String, gd::PropertyDescriptor> SpriteObject::GetProperties()
@@ -127,16 +59,7 @@ bool SpriteObject::UpdateProperty(const gd::String& name,
 }
 
 void SpriteObject::ExposeResources(gd::ArbitraryResourceWorker& worker) {
-  for (std::size_t j = 0; j < GetAnimationsCount(); j++) {
-    for (std::size_t k = 0; k < GetAnimation(j).GetDirectionsCount(); k++) {
-      for (std::size_t l = 0;
-           l < GetAnimation(j).GetDirection(k).GetSpritesCount();
-           l++) {
-        worker.ExposeImage(
-            GetAnimation(j).GetDirection(k).GetSprite(l).GetImageName());
-      }
-    }
-  }
+  animations.ExposeResources(worker);
 }
 
 std::map<gd::String, gd::PropertyDescriptor>
@@ -168,42 +91,12 @@ bool SpriteObject::UpdateInitialInstanceProperty(
   return true;
 }
 
-const Animation& SpriteObject::GetAnimation(std::size_t nb) const {
-  if (nb >= animations.size()) return badAnimation;
-
-  return animations[nb];
+const SpriteAnimationList& SpriteObject::GetAnimations() const {
+  return animations;
 }
 
-Animation& SpriteObject::GetAnimation(std::size_t nb) {
-  if (nb >= animations.size()) return badAnimation;
-
-  return animations[nb];
-}
-
-void SpriteObject::AddAnimation(const Animation& animation) {
-  animations.push_back(animation);
-}
-
-bool SpriteObject::RemoveAnimation(std::size_t nb) {
-  if (nb >= GetAnimationsCount()) return false;
-
-  animations.erase(animations.begin() + nb);
-  return true;
-}
-
-void SpriteObject::SwapAnimations(std::size_t firstIndex,
-                                  std::size_t secondIndex) {
-  if (firstIndex < animations.size() && secondIndex < animations.size() &&
-      firstIndex != secondIndex)
-    std::swap(animations[firstIndex], animations[secondIndex]);
-}
-
-void SpriteObject::MoveAnimation(std::size_t oldIndex, std::size_t newIndex) {
-  if (oldIndex >= animations.size() || newIndex >= animations.size()) return;
-
-  auto animation = animations[oldIndex];
-  animations.erase(animations.begin() + oldIndex);
-  animations.insert(animations.begin() + newIndex, animation);
+SpriteAnimationList& SpriteObject::GetAnimations() {
+  return animations;
 }
 
 }  // namespace gd

Core/GDCore/Extensions/Builtin/SpriteExtension/SpriteObject.h

@@ -4,18 +4,15 @@
  * reserved. This project is released under the MIT License.
  */
 
-#ifndef GDCORE_SPRITEOBJECT_H
-#define GDCORE_SPRITEOBJECT_H
-#include "GDCore/Extensions/Builtin/SpriteExtension/Animation.h"
-#include "GDCore/Extensions/Builtin/SpriteExtension/Direction.h"
-#include "GDCore/Extensions/Builtin/SpriteExtension/Sprite.h"
+#pragma once
+
+#include "GDCore/Extensions/Builtin/SpriteExtension/SpriteAnimationList.h"
 #include "GDCore/Project/Object.h"
+
 namespace gd {
 class InitialInstance;
 class Object;
 class Layout;
-class Sprite;
-class Animation;
 class SerializerElement;
 class PropertyDescriptor;
 }  // namespace gd
@@ -59,76 +56,15 @@ class GD_CORE_API SpriteObject : public gd::ObjectConfiguration {
                                      gd::Project& project,
                                      gd::Layout& scene) override;
 
-  /** \name Animations
-   * Methods related to animations management
-   */
-  ///@{
   /**
-   * \brief Return the animation at the specified index.
-   * If the index is out of bound, a "bad animation" object is returned.
+   * \brief Return the animation configuration.
    */
-  const Animation& GetAnimation(std::size_t nb) const;
+  const SpriteAnimationList& GetAnimations() const;
 
   /**
-   * \brief Return the animation at the specified index.
-   * If the index is out of bound, a "bad animation" object is returned.
+   * @brief Return the animation configuration.
    */
-  Animation& GetAnimation(std::size_t nb);
-
-  /**
-   * \brief Return the number of animations this object has.
-   */
-  std::size_t GetAnimationsCount() const { return animations.size(); };
-
-  /**
-   * \brief Add an animation at the end of the existing ones.
-   */
-  void AddAnimation(const Animation& animation);
-
-  /**
-   * \brief Remove an animation.
-   */
-  bool RemoveAnimation(std::size_t nb);
-
-  /**
-   * \brief Remove all animations.
-   */
-  void RemoveAllAnimations() { animations.clear(); }
-
-  /**
-   * \brief Return true if the object hasn't any animation.
-   */
-  bool HasNoAnimations() const { return animations.empty(); }
-
-  /**
-   * \brief Swap the position of two animations
-   */
-  void SwapAnimations(std::size_t firstIndex, std::size_t secondIndex);
-
-  /**
-   * \brief Change the position of the specified animation
-   */
-  void MoveAnimation(std::size_t oldIndex, std::size_t newIndex);
-
-  /**
-   * \brief Return a read-only reference to the vector containing all the
-   * animation of the object.
-   */
-  const std::vector<Animation>& GetAllAnimations() const { return animations; }
-
-  /**
-   * @brief Check if the collision mask adapts automatically to the animation.
-   */
-  bool AdaptCollisionMaskAutomatically() const {
-    return adaptCollisionMaskAutomatically;
-  }
-
-  /**
-   * @brief Set if the collision mask adapts automatically to the animation.
-   */
-  void SetAdaptCollisionMaskAutomatically(bool enable) {
-    adaptCollisionMaskAutomatically = enable;
-  }
+  SpriteAnimationList& GetAnimations();
 
   /**
    * \brief Set if the object animation should be played even if the object is
@@ -143,25 +79,17 @@ class GD_CORE_API SpriteObject : public gd::ObjectConfiguration {
    * is hidden or far from the camera (false by default).
    */
   bool GetUpdateIfNotVisible() const { return updateIfNotVisible; }
-  ///@}
 
  private:
   void DoUnserializeFrom(gd::Project& project,
                          const gd::SerializerElement& element) override;
   void DoSerializeTo(gd::SerializerElement& element) const override;
 
-  mutable std::vector<Animation> animations;
+  SpriteAnimationList animations;
+
   bool updateIfNotVisible;  ///< If set to true, ask the game engine to play
                             ///< object animation even if hidden or far from
                             ///< the screen.
-
-  static Animation badAnimation;         //< Bad animation when an out of bound
-                                         // animation is requested.
-  bool adaptCollisionMaskAutomatically;  ///< If set to true, the collision
-                                         ///< mask will be automatically
-                                         ///< adapted to the animation of the
-                                         ///< object.
 };
 
 }  // namespace gd
-#endif  // GDCORE_SPRITEOBJECT_H

Core/GDCore/Extensions/Builtin/VariablesExtension.cpp

@@ -25,29 +25,271 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
   extension.AddInstructionOrExpressionGroupMetadata(_("Variables"))
       .SetIcon("res/conditions/var24.png");
 
+  extension
+      .AddCondition("NumberVariable",
+                    _("Variable value"),
+                    _("Compare the number value of a variable."),
+                    _("The variable _PARAM0_"),
+                    "",
+                    "res/conditions/var24.png",
+                    "res/conditions/var.png")
+      .AddParameter("variable", _("Variable"))
+      .UseStandardRelationalOperatorParameters(
+          "number", ParameterOptions::MakeNewOptions());
+
+  extension
+      .AddCondition("StringVariable",
+                    _("Variable value"),
+                    _("Compare the text (string) of a variable."),
+                    _("The variable _PARAM0_"),
+                    "",
+                    "res/conditions/var24.png",
+                    "res/conditions/var.png")
+      .AddParameter("variable", _("Variable"))
+      .UseStandardRelationalOperatorParameters(
+          "string", ParameterOptions::MakeNewOptions());
+
+  extension
+      .AddCondition(
+          "BooleanVariable",
+          _("Variable value"),
+          _("Compare the boolean value of a variable."),
+          _("The variable _PARAM0_ is _PARAM1_"),
+          "",
+          "res/conditions/var24.png",
+          "res/conditions/var.png")
+      .AddParameter("variable", _("Variable"))
+      .AddParameter("trueorfalse", _("Check if the value is"))
+      .SetDefaultValue("true")
+      // This parameter allows to keep the operand expression
+      // when the editor switch between variable instructions.
+      .AddCodeOnlyParameter("trueorfalse", "");
+
+  extension
+      .AddAction("SetNumberVariable",
+                 _("Change variable value"),
+                 _("Modify the number value of a variable."),
+                 _("the variable _PARAM0_"),
+                 "",
+                 "res/actions/var24.png",
+                 "res/actions/var.png")
+      .AddParameter("variable", _("Variable"))
+      .UseStandardOperatorParameters("number",
+                                     ParameterOptions::MakeNewOptions());
+
+  extension
+      .AddAction("SetStringVariable",
+                 _("Change text variable"),
+                 _("Modify the text (string) of a variable."),
+                 _("the variable _PARAM0_"),
+                 "",
+                 "res/actions/var24.png",
+                 "res/actions/var.png")
+      .AddParameter("variable", _("Variable"))
+      .UseStandardOperatorParameters("string",
+                                     ParameterOptions::MakeNewOptions());
+
+  extension
+      .AddAction(
+          "SetBooleanVariable",
+          _("Change boolean variable"),
+          _("Modify the boolean value of a variable."),
+          _("Change the variable _PARAM0_: _PARAM1_"),
+          "",
+          "res/conditions/var24.png",
+          "res/conditions/var.png")
+      .AddParameter("variable", _("Variable"))
+      .AddParameter("operator", _("Value"), "boolean")
+      // This parameter allows to keep the operand expression
+      // when the editor switch between variable instructions.
+      .AddCodeOnlyParameter("trueorfalse", "");
+
+  extension
+      .AddCondition(
+          "VariableChildCount",
+          _("Number of children"),
+          _("Compare the number of children in an array variable."),
+          _("The number of children in the array variable _PARAM0_"),
+          _("Arrays and structures"),
+          "res/conditions/var24.png",
+          "res/conditions/var.png")
+      .AddParameter("variable", _("Array variable"))
+      .UseStandardRelationalOperatorParameters(
+          "number", ParameterOptions::MakeNewOptions())
+      .MarkAsAdvanced();
+
+  extension
+      .AddCondition("VariableChildExists2",
+                    _("Child existence"),
+                    _("Check if the specified child of the structure "
+                      "variable exists."),
+                    _("Child _PARAM1_ of variable _PARAM0_ exists"),
+                    _("Arrays and structures"),
+                    "res/conditions/var24.png",
+                    "res/conditions/var.png")
+      .AddParameter("variable", _("Variable"))
+      .AddParameter("string", _("Name of the child"))
+      .MarkAsAdvanced();
+
+  extension
+      .AddAction(
+          "RemoveVariableChild",
+          _("Remove a child"),
+          _("Remove a child from a structure variable."),
+          _("Remove child _PARAM1_ from structure variable _PARAM0_"),
+          _("Arrays and structures"),
+          "res/actions/var24.png",
+          "res/actions/var.png")
+      .AddParameter("variable", _("Structure variable"))
+      .AddParameter("string", _("Child's name"))
+      .MarkAsAdvanced();
+
+  extension
+      .AddAction("ClearVariableChildren",
+                 _("Clear children"),
+                 _("Remove all the children from the structure or array "
+                   "variable."),
+                 _("Clear children from variable _PARAM0_"),
+                 _("Arrays and structures"),
+                 "res/actions/var24.png",
+                 "res/actions/var.png")
+      .AddParameter("variable", _("Structure or array variable"))
+      .MarkAsAdvanced();
+
+  extension
+      .AddAction("PushVariable",
+                 _("Add existing variable"),
+                 _("Adds an existing variable at the end of an array "
+                   "variable."),
+                 _("Add variable _PARAM1_ to array variable _PARAM0_"),
+                 _("Arrays and structures"),
+                 "res/actions/var24.png",
+                 "res/actions/var.png")
+      .AddParameter("variable", _("Array variable"))
+      .AddParameter("variable", _("Variable with the content to add"))
+      .SetParameterLongDescription(
+          _("The content of the variable will *be copied* and added at the "
+            "end of the array."))
+      .MarkAsAdvanced();
+
+  extension
+      .AddAction(
+          "PushString",
+          _("Add text variable"),
+          _("Adds a text (string) at the end of a array variable."),
+          _("Add the value _PARAM1_ to array variable _PARAM0_"),
+          _("Arrays and structures"),
+          "res/actions/var24.png",
+          "res/actions/var.png")
+      .AddParameter("variable", _("Array variable"))
+      .AddParameter("string", _("Text to add"))
+      .MarkAsAdvanced();
+
+  extension
+      .AddAction("PushNumber",
+                 _("Add variable array value"),
+                 _("Adds a number at the end of an array variable."),
+                 _("Add the value _PARAM1_ to array variable _PARAM0_"),
+                 _("Arrays and structures"),
+                 "res/actions/var24.png",
+                 "res/actions/var.png")
+      .AddParameter("variable", _("Array variable"))
+      .AddParameter("expression", _("Number to add"))
+      .MarkAsAdvanced();
+
+  extension
+      .AddAction("PushBoolean",
+                 _("Add boolean variable"),
+                 _("Adds a boolean at the end of an array variable."),
+                 _("Add the value _PARAM1_ to array variable _PARAM0_"),
+                 _("Arrays and structures"),
+                 "res/actions/var24.png",
+                 "res/actions/var.png")
+      .AddParameter("variable", _("Array variable"))
+      .AddParameter("trueorfalse", _("Boolean to add"))
+      .MarkAsAdvanced();
+
+  extension
+      .AddAction("RemoveVariableAt",
+                 _("Remove variable by index"),
+                 _("Removes a variable at the specified index of an array "
+                   "variable."),
+                 _("Remove variable at index _PARAM1_ from array "
+                   "variable _PARAM0_"),
+                 _("Arrays and structures"),
+                 "res/actions/var24.png",
+                 "res/actions/var.png")
+      .AddParameter("variable", _("Array variable"))
+      .AddParameter("expression", _("Index to remove"))
+      .MarkAsAdvanced();
+
+  extension
+      .AddStrExpression(
+          "VariableFirstString",
+          _("First text child"),
+          _("Get the value of the first element of an array variable, if "
+            "it is a text (string)."),
+          _("Arrays and structures"),
+          "res/actions/var.png")
+      .AddParameter("variable", _("Array variable"));
+
+  extension
+      .AddExpression(
+          "VariableFirstNumber",
+          _("First number child"),
+          _("Get the value of the first element of an array variable, if "
+            "it is a number."),
+          _("Arrays and structures"),
+          "res/actions/var.png")
+      .AddParameter("variable", _("Array variable"));
+
+  extension
+      .AddStrExpression(
+          "VariableLastString",
+          _("Last text child"),
+          _("Get the value of the last element of an array variable, if "
+            "it is a text (string)."),
+          _("Arrays and structures"),
+          "res/actions/var.png")
+      .AddParameter("variable", _("Array variable"));
+
+  extension
+      .AddExpression(
+          "VariableLastNumber",
+          _("Last number child"),
+          _("Get the value of the last element of an array variable, if "
+            "it is a number."),
+          _("Arrays and structures"),
+          "res/actions/var.png")
+      .AddParameter("variable", _("Array variable"));
+
+  // Legacy instructions
+
   extension
       .AddCondition("VarScene",
                     _("Number variable"),
                     _("Compare the number value of a scene variable."),
                     _("The number of scene variable _PARAM0_"),
-                    _("Scene variables"),
+                    _("External variables/Scene variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
-          "number", ParameterOptions::MakeNewOptions());
+          "number", ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddCondition("VarSceneTxt",
                     _("Text variable"),
                     _("Compare the text (string) of a scene variable."),
                     _("The text of scene variable _PARAM0_"),
-                    _("Scene variables"),
+                    _("External variables/Scene variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
-          "string", ParameterOptions::MakeNewOptions());
+          "string", ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddCondition(
@@ -55,12 +297,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Boolean variable"),
           _("Compare the boolean value of a scene variable."),
           _("The boolean value of scene variable _PARAM0_ is _PARAM1_"),
-          _("Scene variables"),
+          _("External variables/Scene variables"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .AddParameter("trueorfalse", _("Check if the value is"))
-      .SetDefaultValue("true");
+      .SetDefaultValue("true")
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddCondition("VariableChildExists",
@@ -68,11 +311,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     _("Check if the specified child of the scene structure "
                       "variable exists."),
                     _("Child _PARAM1_ of scene variable _PARAM0_ exists"),
-                    _("Scene variables/Arrays and structures"),
+                    _("External variables/Scene variables/Arrays and structures"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .AddParameter("string", _("Name of the child"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -81,11 +325,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     _("Check if the specified child of the global structure "
                       "variable exists."),
                     _("Child _PARAM1_ of global variable _PARAM0_ exists"),
-                    _("Global variables/Arrays and structures"),
+                    _("External variables/Global variables/Arrays and structures"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .AddParameter("string", _("Name of the child"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -93,7 +338,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     "Variable defined",
                     "Test if the scene variable exists.",
                     "Scene variable _PARAM0_ is defined",
-                    _("Scene variables"),
+                    _("External variables/Scene variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddCodeOnlyParameter("currentScene", "")
@@ -105,12 +350,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     _("Number variable"),
                     _("Compare the number value of a global variable."),
                     _("the global variable _PARAM0_"),
-                    _("Global variables"),
+                    _("External variables/Global variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -118,12 +364,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     _("Text variable"),
                     _("Compare the text (string) of a global variable."),
                     _("the text of the global variable _PARAM0_"),
-                    _("Global variables"),
+                    _("External variables/Global variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "string", ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -132,19 +379,20 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Boolean variable"),
           _("Compare the boolean value of a global variable."),
           _("The boolean value of global variable _PARAM0_ is _PARAM1_"),
-          _("Global variables"),
+          _("External variables/Global variables"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .AddParameter("trueorfalse", _("Check if the value is"))
-      .SetDefaultValue("true");
+      .SetDefaultValue("true")
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddCondition("VarGlobalDef",
                     "Variable defined",
                     "Test if a global variable exists.",
                     "Global variable _PARAM0_ is defined",
-                    _("Global variables"),
+                    _("External variables/Global variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddCodeOnlyParameter("currentScene", "")
@@ -157,24 +405,26 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Change number variable"),
                  _("Modify the number value of a scene variable."),
                  _("the scene variable _PARAM0_"),
-                 _("Scene variables"),
+                 _("External variables/Scene variables"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .UseStandardOperatorParameters("number",
-                                     ParameterOptions::MakeNewOptions());
+                                     ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddAction("ModVarSceneTxt",
                  _("Change text variable"),
                  _("Modify the text (string) of a scene variable."),
                  _("the text of scene variable _PARAM0_"),
-                 _("Scene variables"),
+                 _("External variables/Scene variables"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .UseStandardOperatorParameters("string",
-                                     ParameterOptions::MakeNewOptions());
+                                     ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddAction(
@@ -182,11 +432,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Change boolean variable"),
           _("Modify the boolean value of a scene variable."),
           _("Set the boolean value of scene variable _PARAM0_ to _PARAM1_"),
-          _("Scene variables"),
+          _("External variables/Scene variables"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
-      .AddParameter("trueorfalse", _("New Value:"));
+      .AddParameter("trueorfalse", _("New Value:"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddAction("ToggleSceneVariableAsBoolean",
@@ -195,22 +446,24 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                      _("If it was true, it will become false, and if it was "
                        "false it will become true."),
                  _("Toggle the boolean value of scene variable _PARAM0_"),
-                 _("Scene variables"),
+                 _("External variables/Scene variables"),
                  "res/conditions/var24.png",
                  "res/conditions/var.png")
-      .AddParameter("scenevar", _("Variable"));
+      .AddParameter("scenevar", _("Variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddAction("ModVarGlobal",
                  _("Change number variable"),
                  _("Modify the number value of a global variable."),
                  _("the global variable _PARAM0_"),
-                 _("Global variables"),
+                 _("External variables/Global variables"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .UseStandardOperatorParameters("number",
                                      ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -218,12 +471,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Change text variable"),
                  _("Modify the text (string) of a global variable."),
                  _("the text of global variable _PARAM0_"),
-                 _("Global variables"),
+                 _("External variables/Global variables"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .UseStandardOperatorParameters("string",
                                      ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -232,11 +486,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Change boolean variable"),
           _("Modify the boolean value of a global variable."),
           _("Set the boolean value of global variable _PARAM0_ to _PARAM1_"),
-          _("Global variables"),
+          _("External variables/Global variables"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
-      .AddParameter("trueorfalse", _("New Value:"));
+      .AddParameter("trueorfalse", _("New Value:"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddAction("ToggleGlobalVariableAsBoolean",
@@ -245,10 +500,11 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                      _("If it was true, it will become false, and if it was "
                        "false it will become true."),
                  _("Toggle the boolean value of global variable _PARAM0_"),
-                 _("Global variables"),
+                 _("External variables/Global variables"),
                  "res/conditions/var24.png",
                  "res/conditions/var.png")
-      .AddParameter("globalvar", _("Variable"));
+      .AddParameter("globalvar", _("Variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddAction(
@@ -256,12 +512,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Remove a child"),
           _("Remove a child from a scene structure variable."),
           _("Remove child _PARAM1_ from scene structure variable _PARAM0_"),
-          _("Scene variables/Arrays and structures"),
+          _("External variables/Scene variables/Arrays and structures"),
           "res/actions/var24.png",
           "res/actions/var.png")
       .AddParameter("scenevar", _("Structure variable"))
       .AddParameter("string", _("Child's name"))
-      .MarkAsAdvanced();
+      .MarkAsAdvanced()
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddAction(
@@ -269,12 +526,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Remove a child"),
           _("Remove a child from a global structure variable."),
           _("Remove child _PARAM1_ from global structure variable _PARAM0_"),
-          _("Global variables/Arrays and structures"),
+          _("External variables/Global variables/Arrays and structures"),
           "res/actions/var24.png",
           "res/actions/var.png")
       .AddParameter("globalvar", _("Structure variable"))
       .AddParameter("string", _("Child's name"))
-      .MarkAsAdvanced();
+      .MarkAsAdvanced()
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddAction("VariableClearChildren",
@@ -282,10 +540,11 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Remove all the children from the scene structure or array "
                    "variable."),
                  _("Clear children from scene variable _PARAM0_"),
-                 _("Scene variables/Arrays and structures"),
+                 _("External variables/Scene variables/Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Structure or array variable"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -294,10 +553,11 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Remove all the children from the global structure or array "
                    "variable."),
                  _("Clear children from global variable _PARAM0_"),
-                 _("Global variables/Arrays and structures"),
+                 _("External variables/Global variables/Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Structure or array variable"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -306,7 +566,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Adds an existing variable at the end of a scene array "
                    "variable."),
                  _("Add variable _PARAM1_ to array variable _PARAM0_"),
-                 _("Scene variables/Arrays and structures"),
+                 _("External variables/Scene variables/Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
@@ -314,6 +574,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
       .SetParameterLongDescription(
           _("The content of the variable will *be copied* and added at the "
             "end of the array."))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -322,11 +583,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Add text variable"),
           _("Adds a text (string) at the end of a scene array variable."),
           _("Add text _PARAM1_ to array variable _PARAM0_"),
-          _("Scene variables/Arrays and structures"),
+          _("External variables/Scene variables/Arrays and structures"),
           "res/actions/var24.png",
           "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
       .AddParameter("string", _("Text to add"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -334,11 +596,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Add number variable"),
                  _("Adds a number at the end of a scene array variable."),
                  _("Add number _PARAM1_ to array variable _PARAM0_"),
-                 _("Scene variables/Arrays and structures"),
+                 _("External variables/Scene variables/Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
       .AddParameter("expression", _("Number to add"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -346,11 +609,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Add boolean variable"),
                  _("Adds a boolean at the end of a scene array variable."),
                  _("Add boolean _PARAM1_ to array variable _PARAM0_"),
-                 _("Scene variables/Arrays and structures"),
+                 _("External variables/Scene variables/Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
       .AddParameter("trueorfalse", _("Boolean to add"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -360,11 +624,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                    "variable."),
                  _("Remove variable at index _PARAM1_ from scene array "
                    "variable _PARAM0_"),
-                 _("Scene variables/Arrays and structures"),
+                 _("External variables/Scene variables/Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
       .AddParameter("expression", _("Index to remove"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -373,12 +638,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Number of children"),
           _("Compare the number of children in a scene array variable."),
           _("The number of children in the array variable _PARAM0_"),
-          _("Scene variables/Arrays and structures"),
+          _("External variables/Scene variables/Arrays and structures"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("scenevar", _("Array variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -387,9 +653,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("First text child"),
           _("Get the value of the first element of a scene array variable, if "
             "it is a text (string)."),
-          _("Scene variables/Arrays and structures"),
+          _("External variables/Scene variables/Arrays and structures"),
           "res/actions/var.png")
-      .AddParameter("scenevar", _("Array variable"));
+      .AddParameter("scenevar", _("Array variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddExpression(
@@ -397,9 +664,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("First number child"),
           _("Get the value of the first element of a scene array variable, if "
             "it is a number."),
-          _("Scene variables/Arrays and structures"),
+          _("External variables/Scene variables/Arrays and structures"),
           "res/actions/var.png")
-      .AddParameter("scenevar", _("Array variable"));
+      .AddParameter("scenevar", _("Array variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddStrExpression(
@@ -407,9 +675,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Last text child"),
           _("Get the value of the last element of a scene array variable, if "
             "it is a text (string)."),
-          _("Scene variables/Arrays and structures"),
+          _("External variables/Scene variables/Arrays and structures"),
           "res/actions/var.png")
-      .AddParameter("scenevar", _("Array variable"));
+      .AddParameter("scenevar", _("Array variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddExpression(
@@ -417,9 +686,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Last number child"),
           _("Get the value of the last element of a scene array variable, if "
             "it is a number."),
-          _("Scene variables/Arrays and structures"),
+          _("External variables/Scene variables/Arrays and structures"),
           "res/actions/var.png")
-      .AddParameter("scenevar", _("Array variable"));
+      .AddParameter("scenevar", _("Array variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddAction(
@@ -427,7 +697,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Add existing variable"),
           _("Adds an existing variable at the end of a global array variable."),
           _("Add variable _PARAM1_ to array variable _PARAM0_"),
-          _("Global variables/Arrays and structures"),
+          _("External variables/Global variables/Arrays and structures"),
           "res/actions/var24.png",
           "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
@@ -435,6 +705,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
       .SetParameterLongDescription(
           _("The content of the variable will *be copied* and added at the "
             "end of the array."))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -444,11 +715,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                    "array variable."),
                  _("Remove variable at index _PARAM1_ from global array "
                    "variable _PARAM0_"),
-                 _("Global variables/Arrays and structures"),
+                 _("External variables/Global variables/Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
       .AddParameter("expression", _("Index to remove"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -457,11 +729,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Add text variable"),
           _("Adds a text (string) at the end of a global array variable."),
           _("Add text _PARAM1_ to array variable _PARAM0_"),
-          _("Global variables/Arrays and structures"),
+          _("External variables/Global variables/Arrays and structures"),
           "res/actions/var24.png",
           "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
       .AddParameter("string", _("Text to add"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -469,11 +742,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Add number variable"),
                  _("Adds a number at the end of a global array variable."),
                  _("Add number _PARAM1_ to array variable _PARAM0_"),
-                 _("Global variables/Arrays and structures"),
+                 _("External variables/Global variables/Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
       .AddParameter("expression", _("Number to add"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -481,11 +755,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Add boolean variable"),
                  _("Adds a boolean at the end of a global array variable."),
                  _("Add boolean _PARAM1_ to array variable _PARAM0_"),
-                 _("Global variables/Arrays and structures"),
+                 _("External variables/Global variables/Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
       .AddParameter("trueorfalse", _("Boolean to add"))
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -494,12 +769,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Number of children"),
           _("Compare the number of children in a global array variable."),
           _("The number of children of the array variable _PARAM0_"),
-          _("Global variables/Arrays and structures"),
+          _("External variables/Global variables/Arrays and structures"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("globalvar", _("Array variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly()
       .MarkAsAdvanced();
 
   extension
@@ -507,18 +783,20 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                         _("First text child"),
                         _("Value of the first element of a global array "
                           "variable, if it is a text (string) variable."),
-                        _("Global variables/Arrays and structures"),
+                        _("External variables/Global variables/Arrays and structures"),
                         "res/actions/var.png")
-      .AddParameter("globalvar", _("Array variable"));
+      .AddParameter("globalvar", _("Array variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddExpression("GlobalVariableFirstNumber",
                      _("First number child"),
                      _("Value of the first element of a global array "
                        "variable, if it is a number variable"),
-                     _("Global variables/Arrays and structures"),
+                     _("External variables/Global variables/Arrays and structures"),
                      "res/actions/var.png")
-      .AddParameter("globalvar", _("Array variable"));
+      .AddParameter("globalvar", _("Array variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddStrExpression(
@@ -526,9 +804,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Last text child"),
           _("Value of the last element of a global array variable, if "
             "it is a text (string) variable."),
-          _("Global variables/Arrays and structures"),
+          _("External variables/Global variables/Arrays and structures"),
           "res/actions/var.png")
-      .AddParameter("globalvar", _("Array variable"));
+      .AddParameter("globalvar", _("Array variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddExpression(
@@ -536,59 +815,65 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Last number child"),
           _("Value of the last element of a global array variable, if "
             "it is a number variable"),
-          _("Global variables/Arrays and structures"),
+          _("External variables/Global variables/Arrays and structures"),
           "res/actions/var.png")
-      .AddParameter("globalvar", _("Array variable"));
+      .AddParameter("globalvar", _("Array variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddExpression("GlobalVariableChildCount",
                      _("Number of children"),
                      _("Number of children in a global array or "
                        "structure variable"),
-                     _("Global variables/Arrays and structures"),
+                     _("External variables/Global variables/Arrays and structures"),
                      "res/actions/var.png")
-      .AddParameter("globalvar", _("Array or structure variable"));
+      .AddParameter("globalvar", _("Array or structure variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddExpression("VariableChildCount",
                      _("Number of children"),
                      _("Number of children in a scene array or "
                        "structure variable"),
-                     _("Scene variables/Arrays and structures"),
+                     _("Arrays and structures"),
                      "res/actions/var.png")
-      .AddParameter("scenevar", _("Array or structure variable"));
+      .AddParameter("variable", _("Array or structure variable"), "AllowUndeclaredVariable");
 
   extension
       .AddExpression("Variable",
                      _("Number variable"),
                      _("Number value of a scene variable"),
-                     _("Scene variables"),
+                     _("External variables/Scene variables"),
                      "res/actions/var.png")
-      .AddParameter("scenevar", _("Variable"));
+      .AddParameter("scenevar", _("Variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddStrExpression("VariableString",
                         _("Text variable"),
                         _("Text of a scene variable"),
-                        _("Scene variables"),
+                        _("External variables/Scene variables"),
                         "res/actions/var.png")
-      .AddParameter("scenevar", _("Variable"));
+      .AddParameter("scenevar", _("Variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddExpression("GlobalVariable",
                      _("Number variable"),
                      _("Number value of a global variable"),
-                     _("Global variables"),
+                     _("External variables/Global variables"),
                      "res/actions/var.png")
-      .AddParameter("globalvar", _("Name of the global variable"));
+      .AddParameter("globalvar", _("Name of the global variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   extension
       .AddStrExpression("GlobalVariableString",
                         _("Text variable"),
                         _("Text of a global variable"),
-                        _("Global variables"),
+                        _("External variables/Global variables"),
                         "res/actions/var.png")
-      .AddParameter("globalvar", _("Variable"));
+      .AddParameter("globalvar", _("Variable"))
+      .SetRelevantForFunctionEventsOnly();
 }
 
 }  // namespace gd

Core/GDCore/Extensions/Metadata/InstructionMetadata.h

@@ -456,6 +456,15 @@ class GD_CORE_API InstructionMetadata : public gd::AbstractFunctionMetadata {
     return *this;
   }
 
+/**
+ * \brief Return the type manipulated in a standard way by the instruction.
+ * 
+ * \param type "number" or "string"
+ */
+  const gd::String &GetManipulatedType() const {
+    return codeExtraInformation.type;
+  }
+
   /**
    * If InstructionMetadata::ExtraInformation::SetManipulatedType was called
    * with "number" or "string", this function will tell the code generator the

Core/GDCore/IDE/EventBasedBehaviorBrowser.cpp

@@ -26,7 +26,7 @@ void EventBasedBehaviorBrowser::ExposeEvents(
 void EventBasedBehaviorBrowser::ExposeEvents(
     gd::Project &project, gd::ArbitraryEventsWorkerWithContext &worker) const {
   gd::ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
-      project, eventsBasedBehavior, worker);
+      project, eventsFunctionsExtension, eventsBasedBehavior, worker);
 }
 
 void EventBasedBehaviorBrowser::ExposeObjects(

Core/GDCore/IDE/EventBasedBehaviorBrowser.h

@@ -29,8 +29,11 @@ namespace gd {
  */
 class GD_CORE_API EventBasedBehaviorBrowser : public ProjectBrowser {
 public:
-  EventBasedBehaviorBrowser(gd::EventsBasedBehavior &eventsBasedBehavior_)
-      : eventsBasedBehavior(eventsBasedBehavior_) {}
+  EventBasedBehaviorBrowser(
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension_,
+      gd::EventsBasedBehavior &eventsBasedBehavior_)
+      : eventsFunctionsExtension(eventsFunctionsExtension_),
+        eventsBasedBehavior(eventsBasedBehavior_) {}
 
   /**
    * \brief Call the specified worker on all events of the event-based
@@ -48,7 +51,7 @@ public:
    * This should be the preferred way to traverse all the events of an event-based behavior.
    */
   void
-  ExposeEvents(gd::Project &project,
+  ExposeEvents(gd::Project &project, 
                gd::ArbitraryEventsWorkerWithContext &worker) const override;
 
   /**
@@ -80,6 +83,7 @@ public:
                          gd::ArbitraryBehaviorSharedDataWorker &worker) const override;
 
 private:
+  const gd::EventsFunctionsExtension &eventsFunctionsExtension;
   gd::EventsBasedBehavior &eventsBasedBehavior;
 };
 

Core/GDCore/IDE/Events/ArbitraryEventsWorker.cpp

@@ -14,29 +14,27 @@
 #include "GDCore/Events/Expression.h"
 #include "GDCore/Extensions/Metadata/ParameterMetadata.h"
 #include "GDCore/String.h"
+#include "GDCore/Tools/Log.h"
 
 using namespace std;
 
 namespace gd {
 
-ArbitraryEventsWorker::~ArbitraryEventsWorker() {}
+AbstractArbitraryEventsWorker::~AbstractArbitraryEventsWorker() {}
 
-void ArbitraryEventsWorker::VisitEventList(gd::EventsList& events) {
+void AbstractArbitraryEventsWorker::VisitEventList(gd::EventsList& events) {
   DoVisitEventList(events);
 
   for (std::size_t i = 0; i < events.size();) {
     if (events[i].AcceptVisitor(*this))
       events.RemoveEvent(i);
     else {
-      if (events[i].CanHaveSubEvents())
-        VisitEventList(events[i].GetSubEvents());
-
       ++i;
     }
   }
 }
 
-bool ArbitraryEventsWorker::VisitEvent(gd::BaseEvent& event) {
+bool AbstractArbitraryEventsWorker::VisitEvent(gd::BaseEvent& event) {
   bool shouldDelete = DoVisitEvent(event);
   if (shouldDelete) return true;
 
@@ -55,15 +53,17 @@ bool ArbitraryEventsWorker::VisitEvent(gd::BaseEvent& event) {
       *expressionAndMetadata.first, expressionAndMetadata.second);
   }
 
-
+  if (!shouldDelete && event.CanHaveSubEvents()) {
+    VisitEventList(event.GetSubEvents());
+  }
   return shouldDelete;
 }
 
-bool ArbitraryEventsWorker::VisitLinkEvent(gd::LinkEvent& linkEvent) {
+bool AbstractArbitraryEventsWorker::VisitLinkEvent(gd::LinkEvent& linkEvent) {
   return DoVisitLinkEvent(linkEvent);
 }
 
-void ArbitraryEventsWorker::VisitInstructionList(
+void AbstractArbitraryEventsWorker::VisitInstructionList(
     gd::InstructionsList& instructions, bool areConditions) {
   DoVisitInstructionList(instructions, areConditions);
 
@@ -79,22 +79,19 @@ void ArbitraryEventsWorker::VisitInstructionList(
   }
 }
 
-bool ArbitraryEventsWorker::VisitInstruction(gd::Instruction& instruction,
+bool AbstractArbitraryEventsWorker::VisitInstruction(gd::Instruction& instruction,
                                              bool isCondition) {
   return DoVisitInstruction(instruction, isCondition);
 }
 
-bool ArbitraryEventsWorker::VisitEventExpression(gd::Expression& expression,
+bool AbstractArbitraryEventsWorker::VisitEventExpression(gd::Expression& expression,
                                                  const gd::ParameterMetadata& metadata) {
   return DoVisitEventExpression(expression, metadata);
 }
 
-ArbitraryEventsWorkerWithContext::~ArbitraryEventsWorkerWithContext() {}
+AbstractReadOnlyArbitraryEventsWorker::~AbstractReadOnlyArbitraryEventsWorker() {}
 
-
-ReadOnlyArbitraryEventsWorker::~ReadOnlyArbitraryEventsWorker() {}
-
-void ReadOnlyArbitraryEventsWorker::VisitEventList(const gd::EventsList& events) {
+void AbstractReadOnlyArbitraryEventsWorker::VisitEventList(const gd::EventsList& events) {
   DoVisitEventList(events);
 
   for (std::size_t i = 0; i < events.size(); ++i) {
@@ -109,7 +106,7 @@ void ReadOnlyArbitraryEventsWorker::VisitEventList(const gd::EventsList& events)
   }
 }
 
-void ReadOnlyArbitraryEventsWorker::VisitEvent(const gd::BaseEvent& event) {
+void AbstractReadOnlyArbitraryEventsWorker::VisitEvent(const gd::BaseEvent& event) {
   DoVisitEvent(event);
 
   const vector<const gd::InstructionsList*> conditionsVectors =
@@ -130,11 +127,11 @@ void ReadOnlyArbitraryEventsWorker::VisitEvent(const gd::BaseEvent& event) {
   }
 }
 
-void ReadOnlyArbitraryEventsWorker::VisitLinkEvent(const gd::LinkEvent& linkEvent) {
+void AbstractReadOnlyArbitraryEventsWorker::VisitLinkEvent(const gd::LinkEvent& linkEvent) {
   DoVisitLinkEvent(linkEvent);
 }
 
-void ReadOnlyArbitraryEventsWorker::VisitInstructionList(
+void AbstractReadOnlyArbitraryEventsWorker::VisitInstructionList(
     const gd::InstructionsList& instructions, bool areConditions) {
   DoVisitInstructionList(instructions, areConditions);
 
@@ -150,21 +147,73 @@ void ReadOnlyArbitraryEventsWorker::VisitInstructionList(
   }
 }
 
-void ReadOnlyArbitraryEventsWorker::VisitInstruction(const gd::Instruction& instruction,
+void AbstractReadOnlyArbitraryEventsWorker::VisitInstruction(const gd::Instruction& instruction,
                                              bool isCondition) {
   DoVisitInstruction(instruction, isCondition);
 }
 
 
-void ReadOnlyArbitraryEventsWorker::VisitEventExpression(const gd::Expression& expression,
+void AbstractReadOnlyArbitraryEventsWorker::VisitEventExpression(const gd::Expression& expression,
                                                  const gd::ParameterMetadata& metadata) {
   DoVisitEventExpression(expression, metadata);
 }
 
-void ReadOnlyArbitraryEventsWorker::StopAnyEventIteration() {
+void AbstractReadOnlyArbitraryEventsWorker::StopAnyEventIteration() {
   shouldStopIteration = true;
 }
 
+ArbitraryEventsWorker::~ArbitraryEventsWorker() {}
+
+bool ArbitraryEventsWorker::VisitEvent(gd::BaseEvent &event) {
+  return AbstractArbitraryEventsWorker::VisitEvent(event);
+}
+
+ArbitraryEventsWorkerWithContext::~ArbitraryEventsWorkerWithContext() {}
+
+bool ArbitraryEventsWorkerWithContext::VisitEvent(gd::BaseEvent &event) {
+  if (!event.HasVariables()) {
+    return AbstractArbitraryEventsWorker::VisitEvent(event);
+  }
+  // Push local variables
+  auto newProjectScopedContainers =
+      ProjectScopedContainers::MakeNewProjectScopedContainersWithLocalVariables(
+          *currentProjectScopedContainers, event);
+  auto *parentProjectScopedContainers = currentProjectScopedContainers;
+  currentProjectScopedContainers = &newProjectScopedContainers;
+
+  bool shouldDelete = AbstractArbitraryEventsWorker::VisitEvent(event);
+
+  // Pop local variables
+  currentProjectScopedContainers = parentProjectScopedContainers;
+  return shouldDelete;
+}
+
+ReadOnlyArbitraryEventsWorker::~ReadOnlyArbitraryEventsWorker() {}
+
+void ReadOnlyArbitraryEventsWorker::VisitEvent(
+    const gd::BaseEvent &event) {
+  AbstractReadOnlyArbitraryEventsWorker::VisitEvent(event);
+}
+
 ReadOnlyArbitraryEventsWorkerWithContext::~ReadOnlyArbitraryEventsWorkerWithContext() {}
 
+void ReadOnlyArbitraryEventsWorkerWithContext::VisitEvent(
+    const gd::BaseEvent &event) {
+  if (!event.HasVariables()) {
+    AbstractReadOnlyArbitraryEventsWorker::VisitEvent(event);
+    return;
+  }
+  // Push local variables
+  auto newProjectScopedContainers =
+      ProjectScopedContainers::MakeNewProjectScopedContainersWithLocalVariables(
+          *currentProjectScopedContainers, event);
+  auto *parentProjectScopedContainers = currentProjectScopedContainers;
+  currentProjectScopedContainers = &newProjectScopedContainers;
+
+  AbstractReadOnlyArbitraryEventsWorker::VisitEvent(event);
+
+  // Pop local variables
+  currentProjectScopedContainers = parentProjectScopedContainers;
+}
+
 }  // namespace gd

Core/GDCore/IDE/Events/ArbitraryEventsWorker.h

@@ -3,8 +3,8 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_ARBITRARYEVENTSWORKER_H
-#define GDCORE_ARBITRARYEVENTSWORKER_H
+#pragma once
+
 #include <map>
 #include <memory>
 #include <vector>
@@ -12,6 +12,7 @@
 #include "GDCore/Events/EventVisitor.h"
 #include "GDCore/Project/ProjectScopedContainers.h"
 #include "GDCore/String.h"
+
 namespace gd {
 class Instruction;
 class BaseEvent;
@@ -25,27 +26,24 @@ class ParameterMetadata;
 namespace gd {
 
 /**
- * \brief ArbitraryEventsWorker is an abstract class used to browse events (and
- * instructions) and do some work on them. Can be used to implement refactoring
- * for example.
+ * \brief AbstractArbitraryEventsWorker is a base abstract class used to browse events (and
+ * instructions) and do some work on them. It must not be inherited directly.
  *
+ * \see gd::ArbitraryEventsWorker
  * \see gd::ArbitraryEventsWorkerWithContext
  *
  * \ingroup IDE
  */
-class GD_CORE_API ArbitraryEventsWorker : private EventVisitor {
+class GD_CORE_API AbstractArbitraryEventsWorker : private EventVisitor {
  public:
-  ArbitraryEventsWorker(){};
-  virtual ~ArbitraryEventsWorker();
+  AbstractArbitraryEventsWorker(){};
+  virtual ~AbstractArbitraryEventsWorker();
 
-  /**
-   * \brief Launch the worker on the specified events list.
-   */
-  void Launch(gd::EventsList& events) { VisitEventList(events); };
+protected:
+  virtual bool VisitEvent(gd::BaseEvent& event) override;
+  void VisitEventList(gd::EventsList& events);
 
  private:
-  void VisitEventList(gd::EventsList& events);
-  bool VisitEvent(gd::BaseEvent& event) override;
   bool VisitLinkEvent(gd::LinkEvent& linkEvent) override;
   void VisitInstructionList(gd::InstructionsList& instructions,
                             bool areConditions);
@@ -101,6 +99,31 @@ class GD_CORE_API ArbitraryEventsWorker : private EventVisitor {
   }
 };
 
+/**
+ * \brief ArbitraryEventsWorker is an abstract class used to browse events (and
+ * instructions) and do some work on them. Can be used to implement refactoring
+ * for example.
+ *
+ * \see gd::ArbitraryEventsWorkerWithContext
+ *
+ * \ingroup IDE
+ */
+class GD_CORE_API ArbitraryEventsWorker : public AbstractArbitraryEventsWorker {
+public:
+  ArbitraryEventsWorker(){};
+  virtual ~ArbitraryEventsWorker();
+
+  /**
+   * \brief Launch the worker on the specified events list.
+   */
+  void Launch(gd::EventsList &events) {
+    AbstractArbitraryEventsWorker::VisitEventList(events);
+  };
+
+private:
+  bool VisitEvent(gd::BaseEvent &event) override;
+};
+
 /**
  * \brief An events worker that will know about the context (the objects
  * container). Useful for workers working on expressions notably.
@@ -110,10 +133,10 @@ class GD_CORE_API ArbitraryEventsWorker : private EventVisitor {
  * \ingroup IDE
  */
 class GD_CORE_API ArbitraryEventsWorkerWithContext
-    : public ArbitraryEventsWorker {
+    : public AbstractArbitraryEventsWorker {
  public:
   ArbitraryEventsWorkerWithContext()
-      : projectScopedContainers(nullptr){};
+      : currentProjectScopedContainers(nullptr){};
   virtual ~ArbitraryEventsWorkerWithContext();
 
   /**
@@ -121,53 +144,50 @@ class GD_CORE_API ArbitraryEventsWorkerWithContext
    * giving the objects container on which the events are applying to.
    */
   void Launch(gd::EventsList& events,
-              const gd::ProjectScopedContainers& projectScopedContainers_) {
-    projectScopedContainers = &projectScopedContainers_;
-    ArbitraryEventsWorker::Launch(events);
+              const gd::ProjectScopedContainers& projectScopedContainers) {
+    currentProjectScopedContainers = &projectScopedContainers;
+    AbstractArbitraryEventsWorker::VisitEventList(events);
   };
 
-  void Launch(gd::EventsList& events) = delete;
-
- protected:
+protected:
   const gd::ProjectScopedContainers& GetProjectScopedContainers() {
     // Pointers are guaranteed to be not nullptr after
     // Launch was called.
-    return *projectScopedContainers;
+    return *currentProjectScopedContainers;
   };
   const gd::ObjectsContainersList& GetObjectsContainersList() {
     // Pointers are guaranteed to be not nullptr after
     // Launch was called.
-    return projectScopedContainers->GetObjectsContainersList();
+    return currentProjectScopedContainers->GetObjectsContainersList();
   };
 
  private:
-  const gd::ProjectScopedContainers* projectScopedContainers;
+  bool VisitEvent(gd::BaseEvent& event) override;
+
+  const gd::ProjectScopedContainers* currentProjectScopedContainers;
 };
 
 /**
  * \brief ReadOnlyArbitraryEventsWorker is an abstract class used to browse events (and
- * instructions). It can be used to implement autocompletion for example.
+ * instructions). It must not be inherited directly.
  *
+ * \see gd::ReadOnlyArbitraryEventsWorker
  * \see gd::ReadOnlyArbitraryEventsWorkerWithContext
  *
  * \ingroup IDE
  */
-class GD_CORE_API ReadOnlyArbitraryEventsWorker : private ReadOnlyEventVisitor {
+class GD_CORE_API AbstractReadOnlyArbitraryEventsWorker : private ReadOnlyEventVisitor {
  public:
-  ReadOnlyArbitraryEventsWorker() : shouldStopIteration(false) {};
-  virtual ~ReadOnlyArbitraryEventsWorker();
-
-  /**
-   * \brief Launch the worker on the specified events list.
-   */
-  void Launch(const gd::EventsList& events) { VisitEventList(events); };
+  AbstractReadOnlyArbitraryEventsWorker() : shouldStopIteration(false) {};
+  virtual ~AbstractReadOnlyArbitraryEventsWorker();
 
 protected:
   void StopAnyEventIteration() override;
+  virtual void VisitEvent(const gd::BaseEvent& event) override;
+
+  void VisitEventList(const gd::EventsList& events);
 
  private:
-  void VisitEventList(const gd::EventsList& events);
-  void VisitEvent(const gd::BaseEvent& event) override;
   void VisitLinkEvent(const gd::LinkEvent& linkEvent) override;
   void VisitInstructionList(const gd::InstructionsList& instructions,
                             bool areConditions);
@@ -213,6 +233,31 @@ protected:
   bool shouldStopIteration;
 };
 
+/**
+ * \brief ReadOnlyArbitraryEventsWorker is an abstract class used to browse events (and
+ * instructions). It can be used to implement autocompletion for example.
+ *
+ * \see gd::ReadOnlyArbitraryEventsWorkerWithContext
+ *
+ * \ingroup IDE
+ */
+class GD_CORE_API ReadOnlyArbitraryEventsWorker
+    : public AbstractReadOnlyArbitraryEventsWorker {
+public:
+  ReadOnlyArbitraryEventsWorker(){};
+  virtual ~ReadOnlyArbitraryEventsWorker();
+
+  /**
+   * \brief Launch the worker on the specified events list.
+   */
+  void Launch(const gd::EventsList &events) {
+    AbstractReadOnlyArbitraryEventsWorker::VisitEventList(events);
+  };
+
+private:
+  void VisitEvent(const gd::BaseEvent &event) override;
+};
+
 /**
  * \brief An events worker that will know about the context (the objects
  * container). Useful for workers working on expressions notably.
@@ -222,10 +267,10 @@ protected:
  * \ingroup IDE
  */
 class GD_CORE_API ReadOnlyArbitraryEventsWorkerWithContext
-    : public ReadOnlyArbitraryEventsWorker {
+    : public AbstractReadOnlyArbitraryEventsWorker {
  public:
   ReadOnlyArbitraryEventsWorkerWithContext()
-      : projectScopedContainers(nullptr){};
+      : currentProjectScopedContainers(nullptr){};
   virtual ~ReadOnlyArbitraryEventsWorkerWithContext();
 
   /**
@@ -233,24 +278,22 @@ class GD_CORE_API ReadOnlyArbitraryEventsWorkerWithContext
    * giving the objects container on which the events are applying to.
    */
   void Launch(const gd::EventsList& events,
-              const gd::ProjectScopedContainers& projectScopedContainers_) {
-    projectScopedContainers = &projectScopedContainers_;
-    ReadOnlyArbitraryEventsWorker::Launch(events);
+              const gd::ProjectScopedContainers& projectScopedContainers) {
+    currentProjectScopedContainers = &projectScopedContainers;
+    AbstractReadOnlyArbitraryEventsWorker::VisitEventList(events);
   };
 
-  void Launch(gd::EventsList& events) = delete;
-
- protected:
+protected:
   const gd::ProjectScopedContainers& GetProjectScopedContainers() {
     // Pointers are guaranteed to be not nullptr after
     // Launch was called.
-    return *projectScopedContainers;
+    return *currentProjectScopedContainers;
   };
 
  private:
-  const gd::ProjectScopedContainers* projectScopedContainers;
+  void VisitEvent(const gd::BaseEvent& event) override;
+
+  const gd::ProjectScopedContainers* currentProjectScopedContainers;
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_ARBITRARYEVENTSWORKER_H

Core/GDCore/IDE/Events/BehaviorParametersFiller.cpp

@@ -0,0 +1,65 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2024 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "BehaviorParametersFiller.h"
+
+#include <map>
+#include <memory>
+#include <vector>
+
+#include "GDCore/Events/Instruction.h"
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+#include "GDCore/Extensions/Metadata/ParameterMetadataTools.h"
+#include "GDCore/String.h"
+#include "GDCore/Tools/Log.h"
+
+namespace gd {
+
+bool BehaviorParametersFiller::DoVisitInstruction(gd::Instruction &instruction,
+                                                  bool isCondition) {
+  const auto &metadata = isCondition
+                             ? gd::MetadataProvider::GetConditionMetadata(
+                                   platform, instruction.GetType())
+                             : gd::MetadataProvider::GetActionMetadata(
+                                   platform, instruction.GetType());
+
+  gd::ParameterMetadataTools::IterateOverParametersWithIndex(
+      instruction.GetParameters(), metadata.GetParameters(),
+      [&](const gd::ParameterMetadata &parameterMetadata,
+          const gd::Expression &parameterValue, size_t parameterIndex,
+          const gd::String &lastObjectName) {
+        if (parameterMetadata.GetValueTypeMetadata().IsBehavior() &&
+            parameterValue.GetPlainString().length() == 0) {
+
+          auto &expectedBehaviorTypeName =
+              parameterMetadata.GetValueTypeMetadata().GetExtraInfo();
+
+          auto &objectsContainersList =
+              projectScopedContainers.GetObjectsContainersList();
+          auto behaviorNames =
+              objectsContainersList.GetBehaviorsOfObject(lastObjectName, true);
+
+          gd::String foundBehaviorName = "";
+          for (auto &behaviorName : behaviorNames) {
+            auto behaviorTypeName =
+                objectsContainersList.GetTypeOfBehavior(behaviorName, false);
+            if (behaviorTypeName == expectedBehaviorTypeName) {
+              foundBehaviorName = behaviorName;
+              break;
+            }
+          }
+          if (!foundBehaviorName.empty()) {
+            instruction.SetParameter(parameterIndex,
+                                     gd::Expression(foundBehaviorName));
+          }
+        }
+      });
+
+  return false;
+}
+
+BehaviorParametersFiller::~BehaviorParametersFiller() {}
+
+} // namespace gd

Core/GDCore/IDE/Events/BehaviorParametersFiller.h

@@ -0,0 +1,45 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2024 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#pragma once
+
+#include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
+#include "GDCore/String.h"
+#include <map>
+#include <memory>
+#include <vector>
+
+namespace gd {
+class Instruction;
+class Platform;
+class ProjectScopedContainers;
+} // namespace gd
+
+namespace gd {
+
+/**
+ * \brief Fill empty behavior parameters with any behavior that matches the
+ * required behavior type.
+ *
+ * \ingroup IDE
+ */
+class GD_CORE_API BehaviorParametersFiller : public ArbitraryEventsWorker {
+public:
+  BehaviorParametersFiller(
+      const gd::Platform &platform_,
+      const gd::ProjectScopedContainers &projectScopedContainers_)
+      : platform(platform_),
+        projectScopedContainers(projectScopedContainers_){};
+  virtual ~BehaviorParametersFiller();
+
+private:
+  bool DoVisitInstruction(gd::Instruction &instruction,
+                          bool isCondition) override;
+
+  const gd::Platform &platform;
+  const gd::ProjectScopedContainers &projectScopedContainers;
+};
+
+} // namespace gd

Core/GDCore/IDE/Events/EventsRefactorer.cpp

@@ -588,31 +588,6 @@ bool EventsRefactorer::RemoveObjectInConditions(
   return somethingModified;
 }
 
-void EventsRefactorer::RemoveObjectInEvents(const gd::Platform& platform,
-                                            gd::ProjectScopedContainers& projectScopedContainers,
-                                            gd::EventsList& events,
-                                            gd::String name) {
-  for (std::size_t i = 0; i < events.size(); ++i) {
-    vector<gd::InstructionsList*> conditionsVectors =
-        events[i].GetAllConditionsVectors();
-    for (std::size_t j = 0; j < conditionsVectors.size(); ++j) {
-      bool conditionsModified = RemoveObjectInConditions(
-          platform, projectScopedContainers, *conditionsVectors[j], name);
-    }
-
-    vector<gd::InstructionsList*> actionsVectors =
-        events[i].GetAllActionsVectors();
-    for (std::size_t j = 0; j < actionsVectors.size(); ++j) {
-      bool actionsModified = RemoveObjectInActions(
-          platform, projectScopedContainers, *actionsVectors[j], name);
-    }
-
-    if (events[i].CanHaveSubEvents())
-      RemoveObjectInEvents(
-          platform, projectScopedContainers, events[i].GetSubEvents(), name);
-  }
-}
-
 gd::String ReplaceAllOccurrencesCaseInsensitive(gd::String context,
                                                 const gd::String& from,
                                                 const gd::String& to) {

Core/GDCore/IDE/Events/EventsRefactorer.h

@@ -86,14 +86,6 @@ class GD_CORE_API EventsRefactorer {
                                    gd::String oldName,
                                    gd::String newName);
 
-  /**
-   * Remove all actions or conditions using an object
-   */
-  static void RemoveObjectInEvents(const gd::Platform& platform,
-                                   gd::ProjectScopedContainers& projectScopedContainers,
-                                   gd::EventsList& events,
-                                   gd::String name);
-
   /**
    * Search for a gd::String in events
    *

Core/GDCore/IDE/Events/EventsVariableInstructionTypeSwitcher.cpp

@@ -0,0 +1,100 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "GDCore/IDE/Events/EventsVariableInstructionTypeSwitcher.h"
+
+#include <map>
+#include <memory>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include "GDCore/Events/Event.h"
+#include "GDCore/Events/EventsList.h"
+#include "GDCore/Events/Parsers/ExpressionParser2NodePrinter.h"
+#include "GDCore/Events/Parsers/ExpressionParser2NodeWorker.h"
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+#include "GDCore/Extensions/Metadata/ParameterMetadata.h"
+#include "GDCore/Extensions/Metadata/ParameterMetadataTools.h"
+#include "GDCore/IDE/Events/ExpressionValidator.h"
+#include "GDCore/IDE/Events/ExpressionVariableOwnerFinder.h"
+#include "GDCore/IDE/Events/ExpressionVariableNameFinder.h"
+#include "GDCore/IDE/VariableInstructionSwitcher.h"
+#include "GDCore/Project/Layout.h"
+#include "GDCore/Project/Project.h"
+#include "GDCore/Project/ProjectScopedContainers.h"
+#include "GDCore/Project/VariablesContainer.h"
+#include "GDCore/String.h"
+#include "GDCore/Tools/Log.h"
+
+namespace gd {
+
+bool EventsVariableInstructionTypeSwitcher::DoVisitInstruction(gd::Instruction& instruction,
+                                                bool isCondition) {
+  const auto& metadata = isCondition
+                             ? gd::MetadataProvider::GetConditionMetadata(
+                                   platform, instruction.GetType())
+                             : gd::MetadataProvider::GetActionMetadata(
+                                   platform, instruction.GetType());
+
+  gd::ParameterMetadataTools::IterateOverParametersWithIndex(
+      instruction.GetParameters(),
+      metadata.GetParameters(),
+      [&](const gd::ParameterMetadata& parameterMetadata,
+          const gd::Expression& parameterValue,
+          size_t parameterIndex,
+          const gd::String& lastObjectName) {
+        const gd::String& type = parameterMetadata.GetType();
+
+        if (!gd::ParameterMetadata::IsExpression("variable", type) ||
+            !gd::VariableInstructionSwitcher::IsSwitchableVariableInstruction(
+                instruction.GetType())) {
+                  return;
+        }
+        const auto variableName =
+            gd::ExpressionVariableNameFinder::GetVariableName(
+                *parameterValue.GetRootNode());
+
+        const gd::VariablesContainer *variablesContainer = nullptr;
+        if (type == "objectvar") {
+          const auto &objectsContainersList =
+              GetProjectScopedContainers().GetObjectsContainersList();
+          if (objectsContainersList.HasObjectOrGroupWithVariableNamed(
+                  lastObjectName, variableName) !=
+              gd::ObjectsContainersList::VariableExistence::DoesNotExist) {
+            variablesContainer =
+                GetProjectScopedContainers()
+                    .GetObjectsContainersList()
+                    .GetObjectOrGroupVariablesContainer(lastObjectName);
+          }
+        } else {
+          if (GetProjectScopedContainers().GetVariablesContainersList().Has(
+                  variableName)) {
+            variablesContainer =
+                &GetProjectScopedContainers()
+                      .GetVariablesContainersList()
+                      .GetVariablesContainerFromVariableName(variableName);
+          }
+        }
+
+        // Every occurrence of the variable or its children are checked.
+        // Ensuring that a child is actually the one with a type change would
+        // take more time.
+        if (variablesContainer == &targetVariablesContainer) {
+          if (typeChangedVariableNames.find(variableName) !=
+              typeChangedVariableNames.end()) {
+            gd::VariableInstructionSwitcher::
+                SwitchBetweenUnifiedInstructionIfNeeded(
+                    platform, GetProjectScopedContainers(), instruction);
+          }
+        }
+      });
+
+  return false;
+}
+
+EventsVariableInstructionTypeSwitcher::~EventsVariableInstructionTypeSwitcher() {}
+
+}  // namespace gd

Core/GDCore/IDE/Events/EventsVariableInstructionTypeSwitcher.h

@@ -0,0 +1,53 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2024 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#pragma once
+
+#include <map>
+#include <memory>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
+#include "GDCore/String.h"
+
+namespace gd {
+class VariablesContainer;
+class Platform;
+}  // namespace gd
+
+namespace gd {
+/**
+ * \brief Switch the types of variable instructions for a given set of
+ * variables.
+ *
+ * \see gd::VariableInstructionSwitcher
+ *
+ * \ingroup IDE
+ */
+class GD_CORE_API EventsVariableInstructionTypeSwitcher
+    : public ArbitraryEventsWorkerWithContext {
+public:
+  EventsVariableInstructionTypeSwitcher(
+      const gd::Platform &platform_,
+      const gd::VariablesContainer &targetVariablesContainer_,
+      const std::unordered_set<gd::String> &typeChangedVariableNames_)
+      : platform(platform_),
+        targetVariablesContainer(targetVariablesContainer_),
+        typeChangedVariableNames(typeChangedVariableNames_){};
+  virtual ~EventsVariableInstructionTypeSwitcher();
+
+ private:
+  bool DoVisitInstruction(gd::Instruction &instruction,
+                          bool isCondition) override;
+
+  const gd::Platform &platform;
+  const gd::VariablesContainer &targetVariablesContainer;
+  gd::String objectName;
+  const std::unordered_set<gd::String> &typeChangedVariableNames;
+};
+
+} // namespace gd

Core/GDCore/IDE/Events/EventsVariableReplacer.cpp

@@ -20,6 +20,9 @@
 #include "GDCore/Extensions/Metadata/ParameterMetadataTools.h"
 #include "GDCore/IDE/Events/ExpressionValidator.h"
 #include "GDCore/IDE/Events/ExpressionVariableOwnerFinder.h"
+#include "GDCore/IDE/Events/ExpressionVariableNameFinder.h"
+#include "GDCore/IDE/VariableInstructionSwitcher.h"
+#include "GDCore/IDE/WholeProjectRefactorer.h"
 #include "GDCore/Project/Layout.h"
 #include "GDCore/Project/Project.h"
 #include "GDCore/Project/ProjectScopedContainers.h"
@@ -42,7 +45,7 @@ class GD_CORE_API ExpressionVariableReplacer
       const gd::Platform& platform_,
       const gd::ProjectScopedContainers& projectScopedContainers_,
       const gd::VariablesContainer& targetVariablesContainer_,
-      const std::unordered_map<gd::String, gd::String>& oldToNewVariableNames_,
+      const VariablesRenamingChangesetNode& variablesRenamingChangesetRoot_,
       const std::unordered_set<gd::String>& removedVariableNames_)
       : hasDoneRenaming(false),
         removedVariableUsed(false),
@@ -50,7 +53,7 @@ class GD_CORE_API ExpressionVariableReplacer
         projectScopedContainers(projectScopedContainers_),
         forcedInitialVariablesContainer(nullptr),
         targetVariablesContainer(targetVariablesContainer_),
-        oldToNewVariableNames(oldToNewVariableNames_),
+        variablesRenamingChangesetRoot(variablesRenamingChangesetRoot_),
         removedVariableNames(removedVariableNames_){};
   virtual ~ExpressionVariableReplacer(){};
 
@@ -80,20 +83,28 @@ class GD_CORE_API ExpressionVariableReplacer
     // will be accessed.
 
     if (forcedInitialVariablesContainer) {
+      const gd::String oldVariableName = node.name;
+      PushVariablesRenamingChangesetRoot();
       // A scope was forced. Honor it: it means this node represents a variable
       // of the forced variables container.
       if (forcedInitialVariablesContainer == &targetVariablesContainer) {
         RenameOrRemoveVariableOfTargetVariableContainer(node.name);
       }
 
-      if (node.child) node.child->Visit(*this);
+      if (node.child) {
+        bool hasBeenPushed =
+            PushVariablesRenamingChangesetNodeForVariable(oldVariableName);
+        node.child->Visit(*this);
+        PopVariablesRenamingChangesetNode(hasBeenPushed);
+      }
+      PopVariablesRenamingChangesetNode(true);
       return;
     }
 
     // Match the potential *new* name of the variable, because refactorings are
     // done after changes in the variables container.
     projectScopedContainers.MatchIdentifierWithName<void>(
-        GetPotentialNewName(node.name),
+        node.name,
         [&]() {
           // This represents an object.
           // Remember the object name.
@@ -103,14 +114,21 @@ class GD_CORE_API ExpressionVariableReplacer
         },
         [&]() {
           // This is a variable.
-          if (projectScopedContainers.GetVariablesContainersList()
-                  .HasVariablesContainer(targetVariablesContainer)) {
+          if (&projectScopedContainers.GetVariablesContainersList()
+                   .GetVariablesContainerFromVariableName(node.name) ==
+              &targetVariablesContainer) {
             // The node represents a variable, that can come from the target
             // (because the target is in the scope), replace or remove it:
-            RenameOrRemoveVariableOfTargetVariableContainer(node.name);
+            PushVariablesRenamingChangesetRoot();
+            RenameVariableAndVisitChild(node.name, node.child.get());
+            PopVariablesRenamingChangesetNode(true);
+          } else {
+            if (node.child) {
+              PushVariablesRenamingChangesetNodeForIgnoredVariables();
+              node.child->Visit(*this);
+              PopVariablesRenamingChangesetNode(true);
+            }
           }
-
-          if (node.child) node.child->Visit(*this);
         },
         [&]() {
           // This is a property.
@@ -121,14 +139,7 @@ class GD_CORE_API ExpressionVariableReplacer
           if (node.child) node.child->Visit(*this);
         },
         [&]() {
-          // This is something else - potentially a deleted variable.
-          if (projectScopedContainers.GetVariablesContainersList()
-                  .HasVariablesContainer(targetVariablesContainer)) {
-            // The node represents a variable, that can come from the target
-            // (because the target is in the scope), replace or remove it:
-            RenameOrRemoveVariableOfTargetVariableContainer(node.name);
-          }
-
+          // This is something else.
           if (node.child) node.child->Visit(*this);
         });
   }
@@ -136,25 +147,49 @@ class GD_CORE_API ExpressionVariableReplacer
     auto& objectsContainersList =
         projectScopedContainers.GetObjectsContainersList();
     if (!objectNameToUseForVariableAccessor.empty()) {
+      // This is always true because MatchIdentifierWithName is used to get
+      // objectNameToUseForVariableAccessor.
       if (objectsContainersList.HasObjectOrGroupVariablesContainer(
               objectNameToUseForVariableAccessor, targetVariablesContainer)) {
+        objectNameToUseForVariableAccessor = "";
         // The node represents an object variable, and this object variables are
         // the target. Do the replacement or removals:
-        RenameOrRemoveVariableOfTargetVariableContainer(node.name);
+        PushVariablesRenamingChangesetRoot();
+        RenameVariableAndVisitChild(node.name, node.child.get());
+        PopVariablesRenamingChangesetNode(true);
       }
+    } else {
+      RenameVariableAndVisitChild(node.name, node.child.get());
     }
-    objectNameToUseForVariableAccessor = "";
-
-    if (node.child) node.child->Visit(*this);
   }
   void OnVisitVariableBracketAccessorNode(
       VariableBracketAccessorNode& node) override {
     objectNameToUseForVariableAccessor = "";
 
+    // TODO Literal expressions could be checked to handle renaming in
+    // `expression` and in `child`.
     node.expression->Visit(*this);
-    if (node.child) node.child->Visit(*this);
+    if (node.child) {
+      PushVariablesRenamingChangesetNodeForIgnoredVariables();
+      node.child->Visit(*this);
+      PopVariablesRenamingChangesetNode(true);
+    }
   }
-  void OnVisitIdentifierNode(IdentifierNode& node) override {
+  void OnVisitIdentifierNode(IdentifierNode &node) override {
+    auto renameVariableAndChild = [this, &node]() {
+      PushVariablesRenamingChangesetRoot();
+      const gd::String oldVariableName = node.identifierName;
+      RenameOrRemoveVariableOfTargetVariableContainer(node.identifierName);
+      if (!node.childIdentifierName.empty()) {
+        bool hasBeenPushed =
+            PushVariablesRenamingChangesetNodeForVariable(oldVariableName);
+        RenameOrRemoveVariableOfTargetVariableContainer(
+            node.childIdentifierName);
+        PopVariablesRenamingChangesetNode(hasBeenPushed);
+      }
+      PopVariablesRenamingChangesetNode(true);
+    };
+
     auto& objectsContainersList =
         projectScopedContainers.GetObjectsContainersList();
 
@@ -166,7 +201,7 @@ class GD_CORE_API ExpressionVariableReplacer
       // A scope was forced. Honor it: it means this node represents a variable
       // of the forced variables container.
       if (forcedInitialVariablesContainer == &targetVariablesContainer) {
-        RenameOrRemoveVariableOfTargetVariableContainer(node.identifierName);
+        renameVariableAndChild();
       }
       return;
     }
@@ -174,25 +209,27 @@ class GD_CORE_API ExpressionVariableReplacer
     // Match the potential *new* name of the variable, because refactorings are
     // done after changes in the variables container.
     projectScopedContainers.MatchIdentifierWithName<void>(
-        GetPotentialNewName(node.identifierName),
+        node.identifierName,
         [&]() {
           // This represents an object.
           if (objectsContainersList.HasObjectOrGroupVariablesContainer(
                   node.identifierName, targetVariablesContainer)) {
             // The node represents an object variable, and this object variables
             // are the target. Do the replacement or removals:
+            PushVariablesRenamingChangesetRoot();
             RenameOrRemoveVariableOfTargetVariableContainer(
                 node.childIdentifierName);
+            PopVariablesRenamingChangesetNode(true);
           }
         },
         [&]() {
           // This is a variable.
-          if (projectScopedContainers.GetVariablesContainersList()
-                  .HasVariablesContainer(targetVariablesContainer)) {
+          if (&projectScopedContainers.GetVariablesContainersList()
+                   .GetVariablesContainerFromVariableName(
+                       node.identifierName) == &targetVariablesContainer) {
             // The node represents a variable, that can come from the target
             // (because the target is in the scope), replace or remove it:
-            RenameOrRemoveVariableOfTargetVariableContainer(
-                node.identifierName);
+            renameVariableAndChild();
           }
         },
         [&]() {
@@ -202,14 +239,7 @@ class GD_CORE_API ExpressionVariableReplacer
           // This is a parameter.
         },
         [&]() {
-          // This is something else - potentially a deleted variable.
-          if (projectScopedContainers.GetVariablesContainersList()
-                  .HasVariablesContainer(targetVariablesContainer)) {
-            // The node represents a variable, that can come from the target
-            // (because the target is in the scope), replace or remove it:
-            RenameOrRemoveVariableOfTargetVariableContainer(
-                node.identifierName);
-          }
+          // This is something else.
         });
   }
   void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode& node) override {}
@@ -268,19 +298,24 @@ class GD_CORE_API ExpressionVariableReplacer
   bool hasDoneRenaming;
   bool removedVariableUsed;
 
-  const gd::String& GetPotentialNewName(const gd::String& oldName) {
-    return oldToNewVariableNames.count(oldName) >= 1
-            ? oldToNewVariableNames.find(oldName)->second
-            : oldName;
-  }
-
   bool RenameOrRemoveVariableOfTargetVariableContainer(
       gd::String& variableName) {
+    const auto *currentVariablesRenamingChangesetNode =
+        GetCurrentVariablesRenamingChangesetNode();
+    if (!currentVariablesRenamingChangesetNode) {
+      return false;
+    }
+    const auto &oldToNewVariableNames =
+        currentVariablesRenamingChangesetNode->oldToNewVariableNames;
     if (oldToNewVariableNames.count(variableName) >= 1) {
       variableName = oldToNewVariableNames.find(variableName)->second;
       hasDoneRenaming = true;
       return true;
-    } else if (removedVariableNames.count(variableName) >= 1) {
+    } else if (
+      // Only the root variable is checked for removing.
+      currentVariablesRenamingChangesetNode ==
+                   &variablesRenamingChangesetRoot &&
+               removedVariableNames.count(variableName) >= 1) {
       removedVariableUsed = true;
       return true;
     }
@@ -288,6 +323,62 @@ class GD_CORE_API ExpressionVariableReplacer
     return false;  // Nothing was changed or done.
   }
 
+  void RenameVariableAndVisitChild(gd::String &variableName,
+                                   ExpressionNode *childNode) {
+    // `variableName` is modified by
+    // `RenameOrRemoveVariableOfTargetVariableContainer`.
+    const gd::String oldVariableName = variableName;
+    RenameOrRemoveVariableOfTargetVariableContainer(variableName);
+    if (childNode) {
+      bool hasBeenPushed =
+          PushVariablesRenamingChangesetNodeForVariable(oldVariableName);
+      childNode->Visit(*this);
+      PopVariablesRenamingChangesetNode(hasBeenPushed);
+    }
+  }
+
+  void PushVariablesRenamingChangesetRoot() {
+    variablesRenamingChangesetNodeStack.push_back(&variablesRenamingChangesetRoot);
+  }
+
+  void PushVariablesRenamingChangesetNodeForIgnoredVariables() {
+    variablesRenamingChangesetNodeStack.push_back(nullptr);
+  }
+
+  const gd::VariablesRenamingChangesetNode *GetCurrentVariablesRenamingChangesetNode() {
+    return variablesRenamingChangesetNodeStack.size() == 0 ?
+    &variablesRenamingChangesetRoot :
+        variablesRenamingChangesetNodeStack
+            [variablesRenamingChangesetNodeStack.size() - 1];
+  }
+
+  bool PushVariablesRenamingChangesetNodeForVariable(const gd::String& variableName) {
+    const auto *currentVariablesRenamingChangesetNode = GetCurrentVariablesRenamingChangesetNode();
+    if (!currentVariablesRenamingChangesetNode) {
+      // There were already no more change on a parent.
+      return false;
+    }
+    const auto &childVariablesRenamingChangesetNodeItr =
+        currentVariablesRenamingChangesetNode->modifiedVariables.find(
+            variableName);
+    if (childVariablesRenamingChangesetNodeItr ==
+        currentVariablesRenamingChangesetNode->modifiedVariables.end()) {
+      // There is no more change on the current variable child.
+      variablesRenamingChangesetNodeStack.push_back(nullptr);
+    }
+    else {
+      variablesRenamingChangesetNodeStack.push_back(
+          childVariablesRenamingChangesetNodeItr->second.get());
+    }
+    return true;
+  }
+
+  void PopVariablesRenamingChangesetNode(bool hasBeenPushed) {
+    if (hasBeenPushed) {
+      variablesRenamingChangesetNodeStack.pop_back();
+    }
+  }
+
   // Scope:
   const gd::Platform& platform;
   const gd::ProjectScopedContainers& projectScopedContainers;
@@ -295,10 +386,11 @@ class GD_CORE_API ExpressionVariableReplacer
 
   // Renaming or removing to do:
   const gd::VariablesContainer& targetVariablesContainer;
-  const std::unordered_map<gd::String, gd::String>& oldToNewVariableNames;
+  const VariablesRenamingChangesetNode &variablesRenamingChangesetRoot;
   const std::unordered_set<gd::String>& removedVariableNames;
 
   gd::String objectNameToUseForVariableAccessor;
+  std::vector<const VariablesRenamingChangesetNode*> variablesRenamingChangesetNodeStack;
 };
 
 const gd::VariablesContainer*
@@ -351,7 +443,7 @@ bool EventsVariableReplacer::DoVisitInstruction(gd::Instruction& instruction,
           ExpressionVariableReplacer renamer(platform,
                                              GetProjectScopedContainers(),
                                              targetVariablesContainer,
-                                             oldToNewVariableNames,
+                                             variablesRenamingChangesetRoot,
                                              removedVariableNames);
           renamer.SetForcedInitialVariablesContainer(
               FindForcedVariablesContainerIfAny(type, lastObjectName));
@@ -383,7 +475,7 @@ bool EventsVariableReplacer::DoVisitEventExpression(
     ExpressionVariableReplacer renamer(platform,
                                        GetProjectScopedContainers(),
                                        targetVariablesContainer,
-                                       oldToNewVariableNames,
+                                       variablesRenamingChangesetRoot,
                                        removedVariableNames);
     renamer.SetForcedInitialVariablesContainer(
         FindForcedVariablesContainerIfAny(type, ""));

Core/GDCore/IDE/Events/EventsVariableReplacer.h

@@ -4,6 +4,7 @@
  * reserved. This project is released under the MIT License.
  */
 #pragma once
+
 #include <map>
 #include <memory>
 #include <unordered_map>
@@ -12,11 +13,13 @@
 
 #include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
 #include "GDCore/String.h"
+
 namespace gd {
 class BaseEvent;
 class VariablesContainer;
 class EventsList;
 class Platform;
+struct VariablesRenamingChangesetNode;
 }  // namespace gd
 
 namespace gd {
@@ -33,12 +36,12 @@ class GD_CORE_API EventsVariableReplacer
   EventsVariableReplacer(
       const gd::Platform &platform_,
       const gd::VariablesContainer &targetVariablesContainer_,
-      const std::unordered_map<gd::String, gd::String> &oldToNewVariableNames_,
+      const VariablesRenamingChangesetNode &variablesRenamingChangesetRoot_,
       const std::unordered_set<gd::String> &removedVariableNames_)
       : platform(platform_),
         targetVariablesContainer(targetVariablesContainer_),
-        oldToNewVariableNames(oldToNewVariableNames_),
-        removedVariableNames(removedVariableNames_){};
+        variablesRenamingChangesetRoot(variablesRenamingChangesetRoot_),
+        removedVariableNames(removedVariableNames_) {};
   virtual ~EventsVariableReplacer();
 
  private:
@@ -53,7 +56,7 @@ class GD_CORE_API EventsVariableReplacer
   const gd::Platform &platform;
   const gd::VariablesContainer &targetVariablesContainer;
   gd::String objectName;
-  const std::unordered_map<gd::String, gd::String> &oldToNewVariableNames;
+  const VariablesRenamingChangesetNode &variablesRenamingChangesetRoot;
   const std::unordered_set<gd::String> &removedVariableNames;
 };
 

Core/GDCore/IDE/Events/EventsVariablesFinder.cpp

@@ -229,7 +229,7 @@ std::set<gd::String> EventsVariablesFinder::FindAllObjectVariables(
     const gd::Platform& platform,
     const gd::Project& project,
     const gd::Layout& layout,
-    const gd::Object& object) {
+    const gd::String& objectName) {
   std::set<gd::String> results;
 
   FindArgumentsInEventsAndDependencies(
@@ -238,7 +238,7 @@ std::set<gd::String> EventsVariablesFinder::FindAllObjectVariables(
       project,
       layout,
       "objectvar",
-      object.GetName());
+      objectName);
 
   return results;
 }

Core/GDCore/IDE/Events/EventsVariablesFinder.h

@@ -63,14 +63,14 @@ class EventsVariablesFinder {
    *
    * \param project The project
    * \param layout The layout to use.
-   * \param  object The object to be scanned
+   * \param  objectName The name of the object to be scanned
    * \return A std::set containing the names of all object variables used.
    */
   static std::set<gd::String> FindAllObjectVariables(
       const gd::Platform& platform,
       const gd::Project& project,
       const gd::Layout& layout,
-      const gd::Object& object);
+      const gd::String& objectName);
 
  private:
 

Core/GDCore/IDE/Events/ExpressionCompletionFinder.h

@@ -3,8 +3,7 @@
  * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_EXPRESSIONAUTOCOMPLETIONPROVIDER_H
-#define GDCORE_EXPRESSIONAUTOCOMPLETIONPROVIDER_H
+#pragma once
 
 #include <memory>
 #include <vector>
@@ -20,7 +19,7 @@
 #include "GDCore/IDE/Events/ExpressionNodeLocationFinder.h"
 #include "GDCore/IDE/Events/ExpressionTypeFinder.h"
 #include "GDCore/IDE/Events/ExpressionVariableOwnerFinder.h"
-#include "GDCore/IDE/Events/ExpressionVariableParentFinder.h"
+#include "GDCore/IDE/Events/ExpressionVariablePathFinder.h"
 #include "GDCore/Project/ProjectScopedContainers.h"
 #include "GDCore/Project/Variable.h"
 
@@ -147,6 +146,19 @@ struct GD_CORE_API ExpressionCompletionDescription {
     return *this;
   }
 
+  /**
+   * \brief Return the scope of the variable, for a variable completion.
+   */
+  gd::VariablesContainer::SourceType GetVariableScope() const {
+    return variableScope;
+  }
+
+  ExpressionCompletionDescription &
+  SetVariableScope(gd::VariablesContainer::SourceType variableScope_) {
+    variableScope = variableScope_;
+    return *this;
+  }
+
   /**
    * \brief Return the prefix that must be completed.
    */
@@ -315,6 +327,7 @@ struct GD_CORE_API ExpressionCompletionDescription {
                                   size_t replacementEndPosition_)
       : completionKind(completionKind_),
         variableType(gd::Variable::Number),
+        variableScope(gd::VariablesContainer::Unknown),
         replacementStartPosition(replacementStartPosition_),
         replacementEndPosition(replacementEndPosition_),
         isExact(false),
@@ -325,6 +338,7 @@ struct GD_CORE_API ExpressionCompletionDescription {
  private:
   CompletionKind completionKind;
   gd::Variable::Type variableType;
+  gd::VariablesContainer::SourceType variableScope;
   gd::String type;
   gd::String prefix;
   gd::String completion;
@@ -525,7 +539,7 @@ class GD_CORE_API ExpressionCompletionFinder
   }
   void OnVisitVariableAccessorNode(VariableAccessorNode& node) override {
     VariableAndItsParent variableAndItsParent =
-        gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+        gd::ExpressionVariablePathFinder::GetLastParentOfNode(
             platform, projectScopedContainers, node);
 
     // If no child, we're at the end of a variable (like `GrandChild` in
@@ -666,7 +680,7 @@ class GD_CORE_API ExpressionCompletionFinder
             [&]() {
               // This is a variable.
               VariableAndItsParent variableAndItsParent =
-                  gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+                  gd::ExpressionVariablePathFinder::GetLastParentOfNode(
                       platform, projectScopedContainers, node);
 
               AddCompletionsForChildrenVariablesOf(
@@ -933,6 +947,7 @@ class GD_CORE_API ExpressionCompletionFinder
               location.GetEndPosition());
           description.SetCompletion(variableName);
           description.SetVariableType(variable.GetType());
+          description.SetVariableScope(variablesContainer.GetSourceType());
           completions.push_back(description);
 
           if (eagerlyCompleteIfExactMatch && variableName == search) {
@@ -958,6 +973,7 @@ class GD_CORE_API ExpressionCompletionFinder
               location.GetEndPosition());
           description.SetCompletion(variableName);
           description.SetVariableType(variable.GetType());
+          description.SetVariableScope(gd::VariablesContainer::Object);
           completions.push_back(description);
 
           if (eagerlyCompleteIfExactMatch && variableName == search) {
@@ -1012,6 +1028,10 @@ class GD_CORE_API ExpressionCompletionFinder
               location.GetEndPosition());
           description.SetCompletion(variableName);
           description.SetVariableType(variable.GetType());
+          description.SetVariableScope(
+              projectScopedContainers.GetVariablesContainersList()
+                  .GetVariablesContainerFromVariableName(variableName)
+                  .GetSourceType());
           completions.push_back(description);
 
           if (eagerlyCompleteIfExactMatch && variableName == search) {
@@ -1060,6 +1080,10 @@ class GD_CORE_API ExpressionCompletionFinder
               location.GetEndPosition());
           description.SetCompletion(variableName);
           description.SetVariableType(variable.GetType());
+          description.SetVariableScope(
+              projectScopedContainers.GetVariablesContainersList()
+                  .GetVariablesContainerFromVariableName(variableName)
+                  .GetSourceType());
           completions.push_back(description);
 
           if (eagerlyCompleteIfExactMatch && variableName == search) {
@@ -1113,5 +1137,3 @@ class GD_CORE_API ExpressionCompletionFinder
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_EXPRESSIONAUTOCOMPLETIONPROVIDER_H

Core/GDCore/IDE/Events/ExpressionValidator.cpp

@@ -106,20 +106,20 @@ bool ExpressionValidator::ValidateObjectVariableOrVariableOrProperty(
       auto variableExistence = objectsContainersList.HasObjectOrGroupWithVariableNamed(identifier.identifierName, identifier.childIdentifierName);
 
       if (variableExistence == gd::ObjectsContainersList::DoesNotExist) {
-        RaiseTypeError(_("This variable does not exist on this object or group."),
-                        identifier.childIdentifierNameLocation);
+        RaiseUndeclaredVariableError(_("This variable does not exist on this object or group."),
+                        identifier.childIdentifierNameLocation, identifier.childIdentifierName, identifier.identifierName);
 
         return true; // We should have found a variable.
       }
       else if (variableExistence == gd::ObjectsContainersList::ExistsOnlyOnSomeObjectsOfTheGroup) {
-        RaiseTypeError(_("This variable only exists on some objects of the group. It must be declared for all objects."),
-                        identifier.childIdentifierNameLocation);
+        RaiseUndeclaredVariableError(_("This variable only exists on some objects of the group. It must be declared for all objects."),
+                        identifier.childIdentifierNameLocation, identifier.childIdentifierName, identifier.identifierName);
 
         return true; // We should have found a variable.
       }
       else if (variableExistence == gd::ObjectsContainersList::GroupIsEmpty) {
-        RaiseTypeError(_("This group is empty. Add an object to this group first."),
-                        identifier.identifierNameLocation);
+        RaiseUndeclaredVariableError(_("This group is empty. Add an object to this group first."),
+                        identifier.identifierNameLocation, identifier.childIdentifierName, identifier.identifierName);
 
         return true; // We should have found a variable.
       }
@@ -166,8 +166,7 @@ bool ExpressionValidator::ValidateObjectVariableOrVariableOrProperty(
         return true; // We found a property, even if the child is not allowed.
       }
 
-      const gd::NamedPropertyDescriptor& property = projectScopedContainers
-          .GetPropertiesContainersList().Get(identifier.identifierName).second;
+      const gd::NamedPropertyDescriptor& property = propertiesContainersList.Get(identifier.identifierName).second;
 
       if (property.GetType() == "Number") {
        childType = Type::Number;
@@ -248,9 +247,10 @@ ExpressionValidator::Type ExpressionValidator::ValidateFunction(
   if (!function.behaviorName.empty() &&
       !objectsContainersList.HasBehaviorInObjectOrGroup(function.objectName,
                                       function.behaviorName)) {
-    RaiseTypeError(_("This behavior is not attached to this object."),
-                   function.behaviorNameLocation,
-                   /*isFatal=*/false);
+    RaiseError(gd::ExpressionParserError::ErrorType::MissingBehavior,
+               _("This behavior is not attached to this object."),
+               function.behaviorNameLocation,
+               /*isFatal=*/false, function.behaviorName, function.objectName);
     return returnType;
   }
 
@@ -264,11 +264,11 @@ ExpressionValidator::Type ExpressionValidator::ValidateFunction(
 
   if (gd::MetadataProvider::IsBadExpressionMetadata(metadata)) {
     if (function.functionName.empty()) {
-      RaiseError("invalid_function_name",
+      RaiseError(gd::ExpressionParserError::ErrorType::InvalidFunctionName,
                _("Enter the name of the function to call."),
                function.location);
     } else {
-      RaiseError("invalid_function_name",
+      RaiseError(gd::ExpressionParserError::ErrorType::InvalidFunctionName,
                _("Cannot find an expression with this name: ") +
                    function.functionName + "\n" +
                    _("Double check that you've not made any typo in the name."),
@@ -341,13 +341,13 @@ ExpressionValidator::Type ExpressionValidator::ValidateFunction(
 
     if (function.parameters.size() < minParametersCount) {
       RaiseError(
-          "too_few_parameters",
+          gd::ExpressionParserError::ErrorType::TooFewParameters,
           _("You have not entered enough parameters for the expression.") +
               " " + expectedCountMessage,
           function.location);
     } else {
       RaiseError(
-          "extra_parameter",
+          gd::ExpressionParserError::ErrorType::TooManyParameters,
           _("This parameter was not expected by this expression. Remove it "
             "or verify that you've entered the proper expression name.") +
               " " + expectedCountMessage,
@@ -376,7 +376,10 @@ ExpressionValidator::Type ExpressionValidator::ValidateFunction(
         dynamic_cast<EmptyNode*>(parameter.get()) == nullptr) {
       auto currentParentType = parentType;
       parentType = StringToType(parameterMetadata.GetType());
+      auto parentParameterExtraInfo = currentParameterExtraInfo;
+      currentParameterExtraInfo = &parameterMetadata.GetExtraInfo();
       parameter->Visit(*this);
+      currentParameterExtraInfo = parentParameterExtraInfo;
       parentType = currentParentType;
 
       const gd::String& expectedParameterType = parameterMetadata.GetType();
@@ -384,7 +387,7 @@ ExpressionValidator::Type ExpressionValidator::ValidateFunction(
               ExpressionValidator::variableTypeString, expectedParameterType)) {
         if (dynamic_cast<IdentifierNode*>(parameter.get()) == nullptr &&
             dynamic_cast<VariableNode*>(parameter.get()) == nullptr) {
-          RaiseError("malformed_variable_parameter",
+          RaiseError(gd::ExpressionParserError::ErrorType::MalformedVariableParameter,
                      _("A variable name was expected but something else was "
                        "written. Enter just the name of the variable for this "
                        "parameter."),
@@ -392,7 +395,7 @@ ExpressionValidator::Type ExpressionValidator::ValidateFunction(
         }
       } else if (gd::ParameterMetadata::IsObject(expectedParameterType)) {
         if (dynamic_cast<IdentifierNode*>(parameter.get()) == nullptr) {
-          RaiseError("malformed_object_parameter",
+          RaiseError(gd::ExpressionParserError::ErrorType::MalformedObjectParameter,
                      _("An object name was expected but something else was "
                        "written. Enter just the name of the object for this "
                        "parameter."),
@@ -406,7 +409,7 @@ ExpressionValidator::Type ExpressionValidator::ValidateFunction(
                !gd::ParameterMetadata::IsExpression(
                    ExpressionValidator::stringTypeString,
                    expectedParameterType)) {
-        RaiseError("unknown_parameter_type",
+        RaiseError(gd::ExpressionParserError::ErrorType::UnknownParameterType,
                    _("This function is improperly set up. Reach out to the "
                      "extension developer or a GDevelop maintainer to fix "
                      "this issue"),
@@ -440,6 +443,10 @@ const gd::String& ExpressionValidator::TypeToString(Type type) {
       return numberOrStringTypeString;
     case Type::Variable:
       return variableTypeString;
+    case Type::LegacyVariable:
+      // This function is only used to display error.
+      // Users don't care if it's legacy or not.
+      return variableTypeString;
     case Type::Object:
       return objectTypeString;
     case Type::Empty:
@@ -466,7 +473,12 @@ ExpressionValidator::Type ExpressionValidator::StringToType(
   if (type == ExpressionValidator::variableTypeString ||
       gd::ParameterMetadata::IsExpression(
           ExpressionValidator::variableTypeString, type)) {
-    return Type::Variable;
+    if (gd::ValueTypeMetadata::IsTypeLegacyPreScopedVariable(type)) {
+      return Type::LegacyVariable;
+    }
+    else {
+      return Type::Variable;
+    }
   }
   if (type == ExpressionValidator::objectTypeString ||
       gd::ParameterMetadata::IsObject(type)) {

Core/GDCore/IDE/Events/ExpressionValidator.h

@@ -3,8 +3,7 @@
  * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_EXPRESSIONVALIDATOR_H
-#define GDCORE_EXPRESSIONVALIDATOR_H
+#pragma once
 
 #include <memory>
 #include <vector>
@@ -39,12 +38,14 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
  public:
   ExpressionValidator(const gd::Platform &platform_,
                       const gd::ProjectScopedContainers & projectScopedContainers_,
-                      const gd::String &rootType_)
+                      const gd::String &rootType_,
+                      const gd::String &extraInfo_ = "")
       : platform(platform_),
         projectScopedContainers(projectScopedContainers_),
         parentType(StringToType(gd::ParameterMetadata::GetExpressionValueType(rootType_))),
         childType(Type::Unknown),
-        forbidsUsageOfBracketsBecauseParentIsObject(false) {};
+        forbidsUsageOfBracketsBecauseParentIsObject(false),
+        currentParameterExtraInfo(&extraInfo_) {};
   virtual ~ExpressionValidator(){};
 
   /**
@@ -65,7 +66,7 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
    *
    * Expressions with fatal error can't be generated.
    */
-  const std::vector<ExpressionParserDiagnostic*>& GetFatalErrors() {
+  const std::vector<ExpressionParserError*>& GetFatalErrors() {
     return fatalErrors;
   };
 
@@ -74,7 +75,7 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
    *
    * No errors means that the expression is valid.
    */
-  const std::vector<ExpressionParserDiagnostic*>& GetAllErrors() {
+  const std::vector<ExpressionParserError*>& GetAllErrors() {
     return allErrors;
   };
 
@@ -86,19 +87,21 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
   void OnVisitOperatorNode(OperatorNode& node) override {
     ReportAnyError(node);
 
+    // The "required" type ("parentType")  will be used when visiting the first operand.
+    // Note that it may be refined thanks to this first operand (see later).
     node.leftHandSide->Visit(*this);
-    const Type leftType = childType;
+    const Type leftType = childType; // Store the type of the first operand.
 
     if (leftType == Type::Number) {
       if (node.op == ' ') {
-        RaiseError("syntax_error",
+        RaiseError(gd::ExpressionParserError::ErrorType::SyntaxError,
             "No operator found. Did you forget to enter an operator (like +, -, "
             "* or /) between numbers or expressions?", node.rightHandSide->location);
       }
     }
     else if (leftType == Type::String) {
       if (node.op == ' ') {
-        RaiseError("syntax_error",
+        RaiseError(gd::ExpressionParserError::ErrorType::SyntaxError,
             "You must add the operator + between texts or expressions. For "
             "example: \"Your name: \" + VariableString(PlayerName).", node.rightHandSide->location);
       }
@@ -113,22 +116,26 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
           _("Operators (+, -, /, *) can't be used with an object name. Remove "
             "the operator."),
             node.rightHandSide->location);
-    } else if (leftType == Type::Variable) {
+    } else if (leftType == Type::Variable || leftType == Type::LegacyVariable) {
       RaiseOperatorError(
           _("Operators (+, -, /, *) can't be used in variable names. Remove "
             "the operator from the variable name."),
             node.rightHandSide->location);
     }
 
-    parentType = leftType;
+    // The "required" type ("parentType") of the second operator is decided by:
+    // - the parent type. Unless it can (`number|string`) or should (`unknown`) be refined, then:
+    // - the first operand.
+    parentType = ShouldTypeBeRefined(parentType) ? leftType : parentType;
     node.rightHandSide->Visit(*this);
     const Type rightType = childType;
 
-    // The type is decided by the first operand, unless it can (`number|string`)
-    // or should (`unknown`) be refined, in which case we go for the right
-    // operand (which got visited knowing the type of the first operand, so it's
+    // The type of the overall operator ("childType") is decided by:
+    // - the parent type. Unless it can (`number|string`) or should (`unknown`) be refined, then:
+    // - the first operand. Unless it can (`number|string`) or should (`unknown`) be refined, then:
+    // - the right operand (which got visited knowing the type of the first operand, so it's
     // equal or strictly more precise than the left operand).
-    childType = (leftType == Type::Unknown || leftType == Type::NumberOrString) ? leftType : rightType;
+    childType = ShouldTypeBeRefined(parentType) ? (ShouldTypeBeRefined(leftType) ? leftType : rightType) : parentType;
   }
   void OnVisitUnaryOperatorNode(UnaryOperatorNode& node) override {
     ReportAnyError(node);
@@ -156,7 +163,7 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
           _("Operators (+, -) can't be used with an object name. Remove the "
             "operator."),
           node.location);
-    } else if (rightType == Type::Variable) {
+    } else if (rightType == Type::Variable || rightType == Type::LegacyVariable) {
       RaiseTypeError(
           _("Operators (+, -) can't be used in variable names. Remove "
             "the operator from the variable name."),
@@ -194,7 +201,14 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     ReportAnyError(node);
 
     if (parentType == Type::Variable) {
-      childType = Type::Variable;
+      childType = parentType;
+
+      CheckVariableExistence(node.location, node.name);
+      if (node.child) {
+        node.child->Visit(*this);
+      }
+    } else if (parentType == Type::LegacyVariable) {
+      childType = parentType;
 
       if (node.child) {
         node.child->Visit(*this);
@@ -264,7 +278,7 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     ReportAnyError(node);
 
     if (forbidsUsageOfBracketsBecauseParentIsObject) {
-      RaiseError("brackets_not_allowed_for_objects",
+      RaiseError(gd::ExpressionParserError::ErrorType::BracketsNotAllowedForObjects,
                  _("You can't use the brackets to access an object variable. "
                    "Use a dot followed by the variable name, like this: "
                    "`MyObject.MyVariable`."),
@@ -273,9 +287,14 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     forbidsUsageOfBracketsBecauseParentIsObject = false;
 
     Type currentParentType = parentType;
+    Type currentChildType = childType;
     parentType = Type::NumberOrString;
+    auto parentParameterExtraInfo = currentParameterExtraInfo;
+    currentParameterExtraInfo = nullptr;
     node.expression->Visit(*this);
+    currentParameterExtraInfo = parentParameterExtraInfo;
     parentType = currentParentType;
+    childType = currentChildType;
 
     if (node.child) {
       node.child->Visit(*this);
@@ -287,7 +306,7 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
       if (!ValidateObjectVariableOrVariableOrProperty(node)) {
         // The identifier is not a variable, so either the variable is not properly declared
         // or it's a text without quotes.
-        RaiseTypeError(_("You must wrap your text inside double quotes "
+        RaiseUnknownIdentifierError(_("You must wrap your text inside double quotes "
                               "(example: \"Hello world\")."),
                             node.location);
       }
@@ -295,20 +314,22 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     else if (parentType == Type::Number) {
       if (!ValidateObjectVariableOrVariableOrProperty(node)) {
         // The identifier is not a variable, so the variable is not properly declared.
-        RaiseTypeError(
-            _("You must enter a number."), node.location);
+        RaiseUnknownIdentifierError(_("You must enter a number."), node.location);
       }
     }
     else if (parentType == Type::NumberOrString) {
       if (!ValidateObjectVariableOrVariableOrProperty(node)) {
         // The identifier is not a variable, so either the variable is not properly declared
         // or it's a text without quotes.
-        RaiseTypeError(
+        RaiseUnknownIdentifierError(
             _("You must enter a number or a text, wrapped inside double quotes (example: \"Hello world\"), or a variable name."),
             node.location);
       }
     }
-    else if (parentType != Type::Object && parentType != Type::Variable) {
+    else if (parentType == Type::Variable) {
+      CheckVariableExistence(node.location, node.identifierName);
+    }
+    else if (parentType != Type::Object && parentType != Type::LegacyVariable) {
       // It can't happen.
       RaiseTypeError(
           _("You've entered a name, but this type was expected:") + " " + TypeToString(parentType),
@@ -332,7 +353,7 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     } else if (parentType == Type::String) {
       message = _(
           "You must enter a text (between quotes) or a valid expression call.");
-    } else if (parentType == Type::Variable) {
+    } else if (parentType == Type::Variable || parentType == Type::LegacyVariable) {
       message = _("You must enter a variable name.");
     } else if (parentType == Type::Object) {
       message = _("You must enter a valid object name.");
@@ -345,12 +366,51 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
   }
 
  private:
-  enum Type {Unknown = 0, Number, String, NumberOrString, Variable, Object, Empty};
+  enum Type {Unknown = 0, Number, String, NumberOrString, Variable, LegacyVariable, Object, Empty};
   Type ValidateFunction(const gd::FunctionCallNode& function);
   bool ValidateObjectVariableOrVariableOrProperty(const gd::IdentifierNode& identifier);
 
+  void CheckVariableExistence(const ExpressionParserLocation &location, const gd::String& name) {
+    if (!currentParameterExtraInfo || *currentParameterExtraInfo != "AllowUndeclaredVariable") {
+      projectScopedContainers.MatchIdentifierWithName<void>(
+          name,
+          [&]() {
+            // This represents an object.
+            RaiseVariableNameCollisionError(
+                _("This variable has the same name as an object. Consider "
+                  "renaming one or the other."),
+                location, name);
+          },
+          [&]() {
+            // This is a variable.
+          },
+          [&]() {
+            // This is a property.
+            // This error won't happen unless the priority is changed.
+            RaiseVariableNameCollisionError(
+                _("This variable has the same name as a property. Consider "
+                  "renaming one or the other."),
+                location, name);
+          },
+          [&]() {
+            // This is a parameter.
+            // This error won't happen unless the priority is changed.
+            RaiseVariableNameCollisionError(
+                _("This variable has the same name as a parameter. Consider "
+                  "renaming one or the other."),
+                location, name);
+          },
+          [&]() {
+            // This is something else.
+            RaiseUndeclaredVariableError(
+                _("No variable with this name found."), location,
+                name);
+          });
+    }
+  }
+
   void ReportAnyError(const ExpressionNode& node, bool isFatal = true) {
-    if (node.diagnostic && node.diagnostic->IsError()) {
+    if (node.diagnostic) {
       // Syntax errors are holden by the AST nodes.
       // It's fine to give pointers on them as the AST live longer than errors
       // handling.
@@ -361,10 +421,13 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     }
   }
 
-  void RaiseError(const gd::String &type,
-      const gd::String &message, const ExpressionParserLocation &location, bool isFatal = true) {
+  void RaiseError(gd::ExpressionParserError::ErrorType type,
+                  const gd::String &message,
+                  const ExpressionParserLocation &location, bool isFatal = true,
+                  const gd::String &actualValue = "",
+                  const gd::String &objectName = "") {
     auto diagnostic = gd::make_unique<ExpressionParserError>(
-        type, message, location);
+        type, message, location, actualValue, objectName);
     allErrors.push_back(diagnostic.get());
     if (isFatal) {
       fatalErrors.push_back(diagnostic.get());
@@ -375,14 +438,39 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     supplementalErrors.push_back(std::move(diagnostic));
   }
 
-  void RaiseTypeError(
-      const gd::String &message, const ExpressionParserLocation &location, bool isFatal = true) {
-    RaiseError("type_error", message, location, isFatal);
+  void RaiseUnknownIdentifierError(const gd::String &message,
+                                   const ExpressionParserLocation &location) {
+    RaiseError(gd::ExpressionParserError::ErrorType::UnknownIdentifier, message,
+               location);
   }
 
-  void RaiseOperatorError(
-      const gd::String &message, const ExpressionParserLocation &location) {
-    RaiseError("invalid_operator", message, location);
+  void RaiseUndeclaredVariableError(const gd::String &message,
+                                    const ExpressionParserLocation &location,
+                                    const gd::String &variableName,
+                                    const gd::String &objectName = "") {
+    RaiseError(gd::ExpressionParserError::ErrorType::UndeclaredVariable,
+               message, location, true, variableName, objectName);
+  }
+
+  void RaiseVariableNameCollisionError(const gd::String &message,
+                                    const ExpressionParserLocation &location,
+                                    const gd::String &variableName,
+                                    const gd::String &objectName = "") {
+    RaiseError(gd::ExpressionParserError::ErrorType::VariableNameCollision,
+               message, location, false, variableName, objectName);
+  }
+
+  void RaiseTypeError(const gd::String &message,
+                      const ExpressionParserLocation &location,
+                      bool isFatal = true) {
+    RaiseError(gd::ExpressionParserError::ErrorType::MismatchedType, message,
+               location, isFatal);
+  }
+
+  void RaiseOperatorError(const gd::String &message,
+                          const ExpressionParserLocation &location) {
+    RaiseError(gd::ExpressionParserError::ErrorType::InvalidOperator, message,
+               location);
   }
 
   void ReadChildTypeFromVariable(gd::Variable::Type variableType) {
@@ -395,6 +483,10 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     }
   }
 
+  static bool ShouldTypeBeRefined(Type type) {
+    return (type == Type::Unknown || type == Type::NumberOrString);
+  }
+
   static Type StringToType(const gd::String &type);
   static const gd::String &TypeToString(Type type);
   static const gd::String unknownTypeString;
@@ -402,20 +494,21 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
   static const gd::String stringTypeString;
   static const gd::String numberOrStringTypeString;
   static const gd::String variableTypeString;
+  static const gd::String legacyVariableTypeString;
   static const gd::String objectTypeString;
   static const gd::String identifierTypeString;
   static const gd::String emptyTypeString;
 
-  std::vector<ExpressionParserDiagnostic*> fatalErrors;
-  std::vector<ExpressionParserDiagnostic*> allErrors;
-  std::vector<std::unique_ptr<ExpressionParserDiagnostic>> supplementalErrors;
+  std::vector<ExpressionParserError*> fatalErrors;
+  std::vector<ExpressionParserError*> allErrors;
+  std::vector<std::unique_ptr<ExpressionParserError>> supplementalErrors;
   Type childType; ///< The type "discovered" down the tree and passed up.
   Type parentType; ///< The type "required" by the top of the tree.
   bool forbidsUsageOfBracketsBecauseParentIsObject;
+  const gd::String *currentParameterExtraInfo;
   const gd::Platform &platform;
   const gd::ProjectScopedContainers &projectScopedContainers;
 };
 
 }  // namespace gd
 
-#endif  // GDCORE_EXPRESSIONVALIDATOR_H

Core/GDCore/IDE/Events/ExpressionVariableNameFinder.h

@@ -0,0 +1,55 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#pragma once
+
+#include "GDCore/Events/Parsers/ExpressionParser2Node.h"
+#include "GDCore/Events/Parsers/ExpressionParser2NodeWorker.h"
+
+namespace gd {
+
+/**
+ * \brief Find the variable name from a variable expression.
+ *
+ * \see gd::ExpressionParser2
+ */
+class GD_CORE_API ExpressionVariableNameFinder : public ExpressionParser2NodeWorker {
+ public:
+
+  static const gd::String GetVariableName(gd::ExpressionNode& node) {
+    gd::ExpressionVariableNameFinder typeFinder;
+    node.Visit(typeFinder);
+    return typeFinder.variableName;
+  }
+
+  virtual ~ExpressionVariableNameFinder(){};
+
+ protected:
+  ExpressionVariableNameFinder()
+      : variableName("") {};
+
+  void OnVisitSubExpressionNode(SubExpressionNode& node) override {}
+  void OnVisitOperatorNode(OperatorNode& node) override {}
+  void OnVisitUnaryOperatorNode(UnaryOperatorNode& node) override {}
+  void OnVisitNumberNode(NumberNode& node) override {}
+  void OnVisitTextNode(TextNode& node) override {}
+  void OnVisitVariableNode(VariableNode& node) override {
+    variableName = node.name;
+  }
+  void OnVisitVariableAccessorNode(VariableAccessorNode& node) override {}
+  void OnVisitIdentifierNode(IdentifierNode& node) override {
+    variableName = node.identifierName;
+  }
+  void OnVisitEmptyNode(EmptyNode& node) override {}
+  void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode& node) override {}
+  void OnVisitVariableBracketAccessorNode(
+      VariableBracketAccessorNode& node) override {}
+  void OnVisitFunctionCallNode(FunctionCallNode& functionCall) override {}
+
+ private:
+  gd::String variableName;
+};
+
+}  // namespace gd

Core/GDCore/IDE/Events/ExpressionVariableParentFinder.h

@@ -1,374 +0,0 @@
-/*
- * GDevelop Core
- * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
- * reserved. This project is released under the MIT License.
- */
-#pragma once
-
-#include <memory>
-#include <vector>
-
-#include "GDCore/Events/Parsers/ExpressionParser2Node.h"
-#include "GDCore/Events/Parsers/ExpressionParser2NodeWorker.h"
-#include "GDCore/Extensions/Metadata/ExpressionMetadata.h"
-#include "GDCore/Extensions/Metadata/MetadataProvider.h"
-#include "GDCore/Extensions/Metadata/ObjectMetadata.h"
-#include "GDCore/Extensions/Metadata/ParameterMetadata.h"
-#include "GDCore/Project/ProjectScopedContainers.h"
-#include "GDCore/Project/Variable.h"
-#include "GDCore/Tools/Localization.h"
-
-namespace gd {
-class Expression;
-class ObjectsContainer;
-class Platform;
-class ParameterMetadata;
-class ExpressionMetadata;
-}  // namespace gd
-
-namespace gd {
-
-/**
- * \brief Contains a variables container or a variable. Useful
- * to refer to the parent of a variable (which can be a VariablesContainer
- * or another Variable).
- */
-struct VariableAndItsParent {
-  const gd::VariablesContainer* parentVariablesContainer;
-  const gd::Variable* parentVariable;
-};
-
-/**
- * \brief Find the last parent (i.e: the variables container) of a node
- * representing a variable.
- *
- * Useful for completions, to know which variables can be entered in a node.
- *
- * \see gd::ExpressionParser2
- */
-class GD_CORE_API ExpressionVariableParentFinder
-    : public ExpressionParser2NodeWorker {
- public:
-  static VariableAndItsParent GetLastParentOfNode(
-      const gd::Platform& platform,
-      const gd::ProjectScopedContainers& projectScopedContainers,
-      gd::ExpressionNode& node) {
-    gd::ExpressionVariableParentFinder typeFinder(platform,
-                                                  projectScopedContainers);
-    node.Visit(typeFinder);
-    return typeFinder.variableAndItsParent;
-  }
-
-  virtual ~ExpressionVariableParentFinder(){};
-
- protected:
-  ExpressionVariableParentFinder(
-      const gd::Platform& platform_,
-      const gd::ProjectScopedContainers& projectScopedContainers_)
-      : platform(platform_),
-        projectScopedContainers(projectScopedContainers_),
-        variableNode(nullptr),
-        thisIsALegacyPrescopedVariable(false),
-        bailOutBecauseEmptyVariableName(false),
-        legacyPrescopedVariablesContainer(nullptr),
-        variableAndItsParent{} {};
-
-  void OnVisitSubExpressionNode(SubExpressionNode& node) override {}
-  void OnVisitOperatorNode(OperatorNode& node) override {}
-  void OnVisitUnaryOperatorNode(UnaryOperatorNode& node) override {}
-  void OnVisitNumberNode(NumberNode& node) override {}
-  void OnVisitTextNode(TextNode& node) override {}
-  void OnVisitVariableNode(VariableNode& node) override {
-    if (variableNode != nullptr) {
-      // This is not possible
-      return;
-    }
-    variableNode = &node;
-
-    // Check if the parent is a function call, in which we might be dealing
-    // with a legacy pre-scoped variable parameter:
-    if (node.parent) node.parent->Visit(*this);
-
-    if (thisIsALegacyPrescopedVariable) {
-      // The node represents a variable name, and the variables container
-      // containing it was identified in the FunctionCallNode.
-      childVariableNames.insert(childVariableNames.begin(), node.name);
-      if (legacyPrescopedVariablesContainer)
-        variableAndItsParent = WalkUntilLastParent(
-            *legacyPrescopedVariablesContainer, childVariableNames);
-    } else {
-      // Otherwise, the identifier is to be interpreted as usual:
-      // it can be an object (on which a variable is accessed),
-      // or a variable.
-      projectScopedContainers.MatchIdentifierWithName<void>(
-          node.name,
-          [&]() {
-            // This is an object.
-            const auto* variablesContainer =
-                projectScopedContainers.GetObjectsContainersList()
-                    .GetObjectOrGroupVariablesContainer(node.name);
-            if (variablesContainer)
-              variableAndItsParent =
-                  WalkUntilLastParent(*variablesContainer, childVariableNames);
-          },
-          [&]() {
-            // This is a variable.
-            if (projectScopedContainers.GetVariablesContainersList().Has(
-                    node.name)) {
-              variableAndItsParent = WalkUntilLastParent(
-                  projectScopedContainers.GetVariablesContainersList().Get(
-                      node.name),
-                  childVariableNames);
-            }
-          },
-          [&]() {
-            // Ignore properties here.
-            // There is no support for "children" of properties.
-          },
-          [&]() {
-            // Ignore parameters here.
-            // There is no support for "children" of parameters.
-          },
-          [&]() {
-            // Ignore unrecognised identifiers here.
-          });
-    }
-  }
-  void OnVisitVariableAccessorNode(VariableAccessorNode& node) override {
-    if (node.name.empty() && node.child) {
-      // A variable accessor should always have a name if it has a child (i.e:
-      // another accessor). While the parser may have generated an empty name,
-      // flag this so we avoid finding a wrong parent (and so, run the risk of
-      // giving wrong autocompletions).
-      bailOutBecauseEmptyVariableName = true;
-    }
-    childVariableNames.insert(childVariableNames.begin(), node.name);
-    if (node.parent) node.parent->Visit(*this);
-  }
-  void OnVisitIdentifierNode(IdentifierNode& node) override {
-    if (variableNode != nullptr) {
-      // This is not possible
-      return;
-    }
-    // This node is not necessarily a variable node.
-    // It will be checked when visiting the FunctionCallNode, just after.
-    variableNode = &node;
-
-    // Check if the parent is a function call, in which we might be dealing
-    // with a legacy pre-scoped variable parameter:
-    if (node.parent) node.parent->Visit(*this);
-
-    if (thisIsALegacyPrescopedVariable) {
-      // The identifier represents a variable name, and the variables container
-      // containing it was identified in the FunctionCallNode.
-      if (!node.childIdentifierName.empty())
-        childVariableNames.insert(childVariableNames.begin(),
-                                  node.childIdentifierName);
-      childVariableNames.insert(childVariableNames.begin(),
-                                node.identifierName);
-
-      if (legacyPrescopedVariablesContainer)
-        variableAndItsParent = WalkUntilLastParent(
-            *legacyPrescopedVariablesContainer, childVariableNames);
-
-    } else {
-      // Otherwise, the identifier is to be interpreted as usual:
-      // it can be an object (on which a variable is accessed),
-      // or a variable.
-      projectScopedContainers.MatchIdentifierWithName<void>(
-          node.identifierName,
-          [&]() {
-            // This is an object.
-            if (!node.childIdentifierName.empty())
-              childVariableNames.insert(childVariableNames.begin(),
-                                        node.childIdentifierName);
-
-            const auto* variablesContainer =
-                projectScopedContainers.GetObjectsContainersList()
-                    .GetObjectOrGroupVariablesContainer(node.identifierName);
-            if (variablesContainer)
-              variableAndItsParent =
-                  WalkUntilLastParent(*variablesContainer, childVariableNames);
-          },
-          [&]() {
-            // This is a variable.
-            if (!node.childIdentifierName.empty())
-              childVariableNames.insert(childVariableNames.begin(),
-                                        node.childIdentifierName);
-
-            if (projectScopedContainers.GetVariablesContainersList().Has(
-                    node.identifierName)) {
-              variableAndItsParent = WalkUntilLastParent(
-                  projectScopedContainers.GetVariablesContainersList().Get(
-                      node.identifierName),
-                  childVariableNames);
-            }
-          },
-          [&]() {
-            // Ignore properties here.
-            // There is no support for "children" of properties.
-          },
-          [&]() {
-            // Ignore parameters here.
-            // There is no support for "children" of properties.
-          },
-          [&]() {
-            // Ignore unrecognised identifiers here.
-          });
-    }
-  }
-  void OnVisitEmptyNode(EmptyNode& node) override {}
-  void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode& node) override {}
-  void OnVisitVariableBracketAccessorNode(
-      VariableBracketAccessorNode& node) override {
-    // Add a child with an empty name, which will be interpreted as
-    // "take the first child/item of the structure/array".
-    childVariableNames.insert(childVariableNames.begin(), "");
-    if (node.parent) node.parent->Visit(*this);
-  }
-  void OnVisitFunctionCallNode(FunctionCallNode& functionCall) override {
-    if (variableNode == nullptr) {
-      return;
-    }
-    int parameterIndex = -1;
-    for (int i = 0; i < functionCall.parameters.size(); i++) {
-      if (functionCall.parameters.at(i).get() == variableNode) {
-        parameterIndex = i;
-        break;
-      }
-    }
-    if (parameterIndex < 0) {
-      return;
-    }
-
-    const auto& objectsContainersList =
-        projectScopedContainers.GetObjectsContainersList();
-
-    const gd::ParameterMetadata* parameterMetadata =
-        MetadataProvider::GetFunctionCallParameterMetadata(
-            platform, objectsContainersList, functionCall, parameterIndex);
-    if (parameterMetadata == nullptr) return;  // Unexpected
-
-    // Support for legacy pre-scoped variables:
-    if (parameterMetadata->GetValueTypeMetadata().IsLegacyPreScopedVariable()) {
-      if (parameterMetadata->GetType() == "objectvar") {
-        // Legacy convention where a "objectvar"
-        // parameter represents a variable of the object represented by the
-        // previous "object" parameter. The object on which the function is
-        // called is returned if no previous parameters are objects.
-        gd::String objectName = functionCall.objectName;
-        for (int previousIndex = parameterIndex - 1; previousIndex >= 0;
-             previousIndex--) {
-          const gd::ParameterMetadata* previousParameterMetadata =
-              MetadataProvider::GetFunctionCallParameterMetadata(
-                  platform, objectsContainersList, functionCall, previousIndex);
-          if (previousParameterMetadata != nullptr &&
-              gd::ParameterMetadata::IsObject(
-                  previousParameterMetadata->GetType())) {
-            auto previousParameterNode =
-                functionCall.parameters[previousIndex].get();
-            IdentifierNode* objectNode =
-                dynamic_cast<IdentifierNode*>(previousParameterNode);
-            objectName = objectNode->identifierName;
-            break;
-          }
-        }
-
-        legacyPrescopedVariablesContainer =
-            projectScopedContainers.GetObjectsContainersList()
-                .GetObjectOrGroupVariablesContainer(objectName);
-        thisIsALegacyPrescopedVariable = true;
-      } else if (parameterMetadata->GetType() == "scenevar") {
-        legacyPrescopedVariablesContainer =
-            projectScopedContainers.GetVariablesContainersList()
-                .GetBottomMostVariablesContainer();
-        thisIsALegacyPrescopedVariable = true;
-      } else if (parameterMetadata->GetType() == "globalvar") {
-        legacyPrescopedVariablesContainer =
-            projectScopedContainers.GetVariablesContainersList()
-                .GetTopMostVariablesContainer();
-        thisIsALegacyPrescopedVariable = true;
-      }
-    } else {
-      thisIsALegacyPrescopedVariable = false;
-      legacyPrescopedVariablesContainer = nullptr;
-    }
-  }
-
- private:
-  VariableAndItsParent WalkUntilLastParent(
-      const gd::Variable& variable,
-      const std::vector<gd::String>& childVariableNames,
-      size_t startIndex = 0) {
-    if (bailOutBecauseEmptyVariableName)
-      return {};  // Do not even attempt to find the parent if we had an issue
-                  // when visiting nodes.
-
-    const gd::Variable* currentVariable = &variable;
-
-    // Walk until size - 1 as we want the last parent.
-    for (size_t index = startIndex; index + 1 < childVariableNames.size();
-         ++index) {
-      const gd::String& childName = childVariableNames[index];
-
-      if (childName.empty()) {
-        if (currentVariable->GetChildrenCount() == 0) {
-          // The array or structure is empty, we can't walk through it - there
-          // is no "parent".
-          return {};
-        }
-
-        if (currentVariable->GetType() == gd::Variable::Array) {
-          currentVariable = &currentVariable->GetAtIndex(0);
-        } else {
-          currentVariable =
-              currentVariable->GetAllChildren().begin()->second.get();
-        }
-      } else {
-        if (!currentVariable->HasChild(childName)) {
-          // Non existing child - there is no "parent".
-          return {};
-        }
-
-        currentVariable = &currentVariable->GetChild(childName);
-      }
-    }
-
-    // Return the last parent of the chain of variables (so not the last
-    // variable but the one before it).
-    return {.parentVariable = currentVariable};
-  }
-
-  VariableAndItsParent WalkUntilLastParent(
-      const gd::VariablesContainer& variablesContainer,
-      const std::vector<gd::String>& childVariableNames) {
-    if (bailOutBecauseEmptyVariableName)
-      return {};  // Do not even attempt to find the parent if we had an issue
-                  // when visiting nodes.
-    if (childVariableNames.empty())
-      return {};  // There is no "parent" to the variables container itself.
-
-    const gd::String& firstChildName = *childVariableNames.begin();
-
-    const gd::Variable* variable = variablesContainer.Has(firstChildName)
-                                       ? &variablesContainer.Get(firstChildName)
-                                       : nullptr;
-    if (childVariableNames.size() == 1 || !variable)
-      return {// Only one child: the parent is the variables container itself.
-              .parentVariablesContainer = &variablesContainer};
-
-    return WalkUntilLastParent(*variable, childVariableNames, 1);
-  }
-
-  gd::ExpressionNode* variableNode;
-  std::vector<gd::String> childVariableNames;
-  bool thisIsALegacyPrescopedVariable;
-  bool bailOutBecauseEmptyVariableName;
-  const gd::VariablesContainer* legacyPrescopedVariablesContainer;
-  VariableAndItsParent variableAndItsParent;
-
-  const gd::Platform& platform;
-  const gd::ProjectScopedContainers& projectScopedContainers;
-};
-
-}  // namespace gd

Core/GDCore/IDE/Events/ExpressionVariablePathFinder.cpp

@@ -0,0 +1,195 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "ExpressionVariablePathFinder.h"
+
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+
+namespace gd {
+
+/**
+ * \brief Find the pre-scoped container of legacy variables or the object name
+ * from the function call node.
+ */
+class GD_CORE_API ExpressionLiteralFinder : public ExpressionParser2NodeWorker {
+public:
+  virtual ~ExpressionLiteralFinder(){};
+
+  gd::String literalValue;
+
+  ExpressionLiteralFinder() : literalValue(""){};
+
+protected:
+  void OnVisitSubExpressionNode(SubExpressionNode &node) override {}
+  void OnVisitOperatorNode(OperatorNode &node) override {}
+  void OnVisitUnaryOperatorNode(UnaryOperatorNode &node) override {}
+  void OnVisitNumberNode(NumberNode &node) override {
+    literalValue = node.number;
+  }
+  void OnVisitTextNode(TextNode &node) override { literalValue = node.text; }
+  void OnVisitVariableNode(VariableNode &node) override {}
+  void OnVisitVariableAccessorNode(VariableAccessorNode &node) override {}
+  void OnVisitIdentifierNode(IdentifierNode &node) override {}
+  void OnVisitEmptyNode(EmptyNode &node) override {}
+  void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode &node) override {}
+  void OnVisitVariableBracketAccessorNode(
+      VariableBracketAccessorNode &node) override {}
+  void OnVisitFunctionCallNode(FunctionCallNode &functionCall) override {}
+};
+
+void ExpressionVariablePathFinder::OnVisitVariableBracketAccessorNode(
+    VariableBracketAccessorNode &node) {
+  // Try to find a literal accessor or add a child with an empty name, which
+  // will be interpreted as "take the first child/item of the structure/array".
+  gd::ExpressionLiteralFinder expressionLiteralFinder;
+  if (node.expression) {
+    node.expression->Visit(expressionLiteralFinder);
+  }
+  childVariableNames.push_back(expressionLiteralFinder.literalValue);
+
+  if (node.child && &node != lastNodeToCheck) {
+    node.child->Visit(*this);
+  }
+}
+
+/**
+ * \brief Find the pre-scoped container of legacy variables or the object name
+ * from the function call node.
+ */
+class GD_CORE_API ExpressionVariableContextFinder
+    : public ExpressionParser2NodeWorker {
+ public:
+
+  virtual ~ExpressionVariableContextFinder(){};
+
+  gd::String objectName;
+  gd::String parameterType;
+  gd::ExpressionNode* variableNode;
+
+  ExpressionVariableContextFinder(
+      const gd::Platform& platform_,
+      const gd::ProjectScopedContainers& projectScopedContainers_)
+      : platform(platform_),
+        projectScopedContainers(projectScopedContainers_),
+        variableNode(nullptr),
+        objectName(""),
+        parameterType("") {};
+
+ protected:
+  void OnVisitSubExpressionNode(SubExpressionNode& node) override {}
+  void OnVisitOperatorNode(OperatorNode& node) override {}
+  void OnVisitUnaryOperatorNode(UnaryOperatorNode& node) override {}
+  void OnVisitNumberNode(NumberNode& node) override {}
+  void OnVisitTextNode(TextNode& node) override {}
+  void OnVisitVariableNode(VariableNode& node) override {
+    if (variableNode) {
+      // This is not possible
+      return;
+    }
+    variableNode = &node;
+
+    // Check if the parent is a function call, in which we might be dealing
+    // with a legacy pre-scoped variable parameter:
+    if (node.parent) node.parent->Visit(*this);
+  }
+  void OnVisitVariableAccessorNode(VariableAccessorNode& node) override {
+    if (node.parent) node.parent->Visit(*this);
+  }
+  void OnVisitIdentifierNode(IdentifierNode& node) override {
+    if (variableNode) {
+      // This is not possible
+      return;
+    }
+    // This node is not necessarily a variable node.
+    // It will be checked when visiting the FunctionCallNode, just after.
+    variableNode = &node;
+
+    // Check if the parent is a function call, in which we might be dealing
+    // with a legacy pre-scoped variable parameter:
+    if (node.parent) node.parent->Visit(*this);
+  }
+  void OnVisitEmptyNode(EmptyNode& node) override {}
+  void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode& node) override {}
+  void OnVisitVariableBracketAccessorNode(
+      VariableBracketAccessorNode& node) override {
+    if (node.parent) node.parent->Visit(*this);
+      }
+  void OnVisitFunctionCallNode(FunctionCallNode& functionCall) override {
+    int parameterIndex = -1;
+    for (int i = 0; i < functionCall.parameters.size(); i++) {
+      if (functionCall.parameters.at(i).get() == variableNode) {
+        parameterIndex = i;
+        break;
+      }
+    }
+    if (parameterIndex < 0) {
+      return;
+    }
+
+    const auto& objectsContainersList =
+        projectScopedContainers.GetObjectsContainersList();
+
+    const gd::ParameterMetadata* parameterMetadata =
+        MetadataProvider::GetFunctionCallParameterMetadata(
+            platform, objectsContainersList, functionCall, parameterIndex);
+    if (parameterMetadata == nullptr) return;  // Unexpected
+
+    if (parameterMetadata->GetType() == "objectvar") {
+      // Legacy convention where a "objectvar"
+      // parameter represents a variable of the object represented by the
+      // previous "object" parameter. The object on which the function is
+      // called is returned if no previous parameters are objects.
+      objectName = functionCall.objectName;
+      for (int previousIndex = parameterIndex - 1; previousIndex >= 0;
+            previousIndex--) {
+        const gd::ParameterMetadata* previousParameterMetadata =
+            MetadataProvider::GetFunctionCallParameterMetadata(
+                platform, objectsContainersList, functionCall, previousIndex);
+        if (previousParameterMetadata != nullptr &&
+            gd::ParameterMetadata::IsObject(
+                previousParameterMetadata->GetType())) {
+          auto previousParameterNode =
+              functionCall.parameters[previousIndex].get();
+          IdentifierNode* objectNode =
+              dynamic_cast<IdentifierNode*>(previousParameterNode);
+          objectName = objectNode->identifierName;
+          break;
+        }
+      }
+      parameterType = parameterMetadata->GetType();
+    }
+  }
+
+ private:
+  const gd::Platform& platform;
+  const gd::ProjectScopedContainers& projectScopedContainers;
+
+};
+
+VariableAndItsParent ExpressionVariablePathFinder::GetLastParentOfNode(
+    const gd::Platform &platform,
+    const gd::ProjectScopedContainers &projectScopedContainers,
+    gd::ExpressionNode &node) {
+
+  gd::ExpressionVariableContextFinder contextFinder(platform,
+                                                    projectScopedContainers);
+  node.Visit(contextFinder);
+  if (!contextFinder.variableNode) {
+    return {};
+  }
+
+  gd::ExpressionVariablePathFinder typeFinder(platform, projectScopedContainers,
+                                              contextFinder.parameterType,
+                                              contextFinder.objectName, &node);
+  contextFinder.variableNode->Visit(typeFinder);
+
+  if (typeFinder.variableName.empty() || !typeFinder.variablesContainer) {
+    return {};
+  }
+  return typeFinder.WalkUntilLastParent(*typeFinder.variablesContainer,
+                                        typeFinder.childVariableNames);
+}
+
+}  // namespace gd

Core/GDCore/IDE/Events/ExpressionVariablePathFinder.h

@@ -0,0 +1,357 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include "GDCore/Events/Parsers/ExpressionParser2Node.h"
+#include "GDCore/Events/Parsers/ExpressionParser2NodeWorker.h"
+#include "GDCore/Project/ProjectScopedContainers.h"
+#include "GDCore/Project/Variable.h"
+#include "GDCore/Project/VariablesContainer.h"
+
+namespace gd {
+class Platform;
+}  // namespace gd
+
+namespace gd {
+
+/**
+ * \brief Contains a variables container or a variable. Useful
+ * to refer to the parent of a variable (which can be a VariablesContainer
+ * or another Variable).
+ */
+struct VariableAndItsParent {
+  const gd::VariablesContainer* parentVariablesContainer;
+  const gd::Variable* parentVariable;
+};
+
+/**
+ * \brief Find a variable path from an expression node.
+ *
+ * \see gd::ExpressionParser2
+ */
+class GD_CORE_API ExpressionVariablePathFinder
+    : public ExpressionParser2NodeWorker {
+ public:
+
+  static VariableAndItsParent GetLastParentOfNode(
+      const gd::Platform& platform,
+      const gd::ProjectScopedContainers& projectScopedContainers,
+      gd::ExpressionNode& node);
+
+  static const gd::Variable::Type GetVariableType(
+      const gd::Platform& platform,
+      const gd::ProjectScopedContainers& projectScopedContainers,
+      gd::ExpressionNode& node, const gd::String& objectName) {
+    // The context is not checked because this is called on variable parameters.
+    gd::String parameterType = objectName.empty() ? "variable" : "objectvar";
+    gd::String objName = objectName;
+    gd::ExpressionVariablePathFinder typeFinder(
+        platform, projectScopedContainers, parameterType, objName);
+    node.Visit(typeFinder);
+
+    if (typeFinder.variableName.empty() || !typeFinder.variablesContainer) {
+      return gd::Variable::Unknown;
+    }
+    auto *variable = typeFinder.WalkUntilLastChild(
+        typeFinder.variablesContainer->Get(typeFinder.variableName),
+        typeFinder.childVariableNames);
+    return variable ? variable->GetType() : gd::Variable::Unknown;
+  }
+
+  static const gd::Variable::Type GetArrayVariableType(
+      const gd::Platform& platform,
+      const gd::ProjectScopedContainers& projectScopedContainers,
+      gd::ExpressionNode& node, const gd::String& objectName) {
+    // The context is not checked because this is called on variable parameters.
+    gd::String parameterType = objectName.empty() ? "variable" : "objectvar";
+    gd::String objName = objectName;
+    gd::ExpressionVariablePathFinder typeFinder(
+        platform, projectScopedContainers, parameterType, objName);
+    node.Visit(typeFinder);
+
+    if (typeFinder.variableName.empty() || !typeFinder.variablesContainer) {
+      return gd::Variable::Unknown;
+    }
+    auto *variable = typeFinder.WalkUntilLastChild(
+        typeFinder.variablesContainer->Get(typeFinder.variableName),
+        typeFinder.childVariableNames);
+    if (variable && variable->GetType() != gd::Variable::Array) {
+      return gd::Variable::Unknown;
+    }
+    return variable && variable->GetChildrenCount() > 0
+               ? variable->GetAtIndex(0).GetType()
+               : gd::Variable::Unknown;
+  }
+
+  virtual ~ExpressionVariablePathFinder(){};
+
+ protected:
+  ExpressionVariablePathFinder(
+      const gd::Platform& platform_,
+      const gd::ProjectScopedContainers& projectScopedContainers_,
+      const gd::String& parameterType_,
+      gd::String& objectName_,
+      const gd::ExpressionNode* lastNodeToCheck_ = nullptr)
+      : platform(platform_),
+        projectScopedContainers(projectScopedContainers_),
+        parameterType(parameterType_),
+        objectName(objectName_),
+        lastNodeToCheck(lastNodeToCheck_),
+        variablesContainer(nullptr),
+        variableName(""),
+        bailOutBecauseEmptyVariableName(false) {};
+
+  void OnVisitVariableBracketAccessorNode(
+      VariableBracketAccessorNode& node) override;
+
+  void OnVisitSubExpressionNode(SubExpressionNode& node) override {}
+  void OnVisitOperatorNode(OperatorNode& node) override {}
+  void OnVisitUnaryOperatorNode(UnaryOperatorNode& node) override {}
+  void OnVisitNumberNode(NumberNode& node) override {}
+  void OnVisitTextNode(TextNode& node) override {}
+  void OnVisitVariableNode(VariableNode& node) override {
+    FindVariableFor(node.name);
+    if (node.child && &node != lastNodeToCheck) node.child->Visit(*this);
+  }
+  void OnVisitVariableAccessorNode(VariableAccessorNode& node) override {
+    if (node.name.empty() && node.child) {
+      // A variable accessor should always have a name if it has a child (i.e:
+      // another accessor). While the parser may have generated an empty name,
+      // flag this so we avoid finding a wrong parent (and so, run the risk of
+      // giving wrong autocompletions).
+      bailOutBecauseEmptyVariableName = true;
+    }
+    if (variableName.empty()) {
+      const auto& objectsContainersList = projectScopedContainers.GetObjectsContainersList();
+      if (objectsContainersList.HasObjectOrGroupWithVariableNamed(objectName,
+                                                                  node.name) !=
+          gd::ObjectsContainersList::VariableExistence::DoesNotExist) {
+        variableName = node.name;
+        variablesContainer =
+            projectScopedContainers.GetObjectsContainersList()
+                .GetObjectOrGroupVariablesContainer(objectName);
+      }
+    } else {
+      childVariableNames.push_back(node.name);
+    }
+    if (node.child && &node != lastNodeToCheck) node.child->Visit(*this);
+  }
+  void OnVisitIdentifierNode(IdentifierNode& node) override {
+    FindVariableFor(node.identifierName, node.identifierNameDotLocation.IsValid() ? &node.childIdentifierName : nullptr);
+  }
+  void OnVisitEmptyNode(EmptyNode& node) override {}
+  void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode& node) override {}
+  void OnVisitFunctionCallNode(FunctionCallNode& functionCall) override {}
+
+  void FindVariableFor(const gd::String& identifier, gd::String* childIdentifier = nullptr) {
+    if (!objectName.empty()) {
+      const auto& objectsContainersList = projectScopedContainers.GetObjectsContainersList();
+      if (objectsContainersList.HasObjectOrGroupWithVariableNamed(objectName,
+                                                                  identifier) !=
+          gd::ObjectsContainersList::VariableExistence::DoesNotExist) {
+        variableName = identifier;
+        variablesContainer =
+            projectScopedContainers.GetObjectsContainersList()
+                .GetObjectOrGroupVariablesContainer(objectName);
+        if (childIdentifier) {
+          childVariableNames.push_back(*childIdentifier);
+        }
+      }
+    }
+    else if (parameterType == "scenevar") {
+      // The node represents a variable name, and the variables container
+      // containing it was identified in the FunctionCallNode.
+      variablesContainer = projectScopedContainers.GetVariablesContainersList()
+                .GetBottomMostVariablesContainer();
+      variableName = identifier;
+      if (childIdentifier) {
+        childVariableNames.push_back(*childIdentifier);
+      }
+    } 
+    else if (parameterType == "globalvar") {
+      // The node represents a variable name, and the variables container
+      // containing it was identified in the FunctionCallNode.
+      variablesContainer = projectScopedContainers.GetVariablesContainersList()
+                .GetTopMostVariablesContainer();
+      variableName = identifier;
+      if (childIdentifier) {
+        childVariableNames.push_back(*childIdentifier);
+      }
+    } else {
+      // Otherwise, the identifier is to be interpreted as usual:
+      // it can be an object (on which a variable is accessed),
+      // or a variable.
+      projectScopedContainers.MatchIdentifierWithName<void>(
+          identifier,
+          [&]() {
+            objectName = identifier;
+            if (childIdentifier) {
+              if (parameterType == "variable") {
+                // An object is overlapping the variable.
+                // Even in "variable" parameters, this is not allowed to be
+                // consistent with expressions.
+              } else {
+                // It's an object variable expression.
+                const auto& objectsContainersList = projectScopedContainers.GetObjectsContainersList();
+                if (objectsContainersList.HasObjectOrGroupWithVariableNamed(objectName,
+                                                                            *childIdentifier) !=
+                    gd::ObjectsContainersList::VariableExistence::DoesNotExist) {
+                  variableName = *childIdentifier;
+                  variablesContainer =
+                      projectScopedContainers.GetObjectsContainersList()
+                          .GetObjectOrGroupVariablesContainer(objectName);
+                }
+              }
+            }
+          },
+          [&]() {
+            // This is a variable.
+            if (projectScopedContainers.GetVariablesContainersList().Has(identifier)) {
+              variablesContainer =
+                  &(projectScopedContainers.GetVariablesContainersList()
+                        .GetVariablesContainerFromVariableName(identifier));
+              variableName = identifier;
+              if (childIdentifier) {
+                childVariableNames.push_back(*childIdentifier);
+              }
+            }
+          },
+          [&]() {
+            // Ignore properties here.
+            // There is no support for "children" of properties.
+          },
+          [&]() {
+            // Ignore parameters here.
+            // There is no support for "children" of parameters.
+          },
+          [&]() {
+            // Ignore unrecognised identifiers here.
+          });
+    }
+  }
+
+ private:
+  const gd::Variable* WalkUntilLastChild(
+      const gd::Variable& variable,
+      const std::vector<gd::String>& childVariableNames,
+      size_t startIndex = 0) {
+    if (bailOutBecauseEmptyVariableName)
+      return nullptr;  // Do not even attempt to find the parent if we had an issue
+                  // when visiting nodes.
+
+    const gd::Variable* currentVariable = &variable;
+
+    for (size_t index = startIndex; index < childVariableNames.size();
+         ++index) {
+      const gd::String& childName = childVariableNames[index];
+
+      if (childName.empty()) {
+        if (currentVariable->GetChildrenCount() == 0) {
+          // The array or structure is empty, we can't walk through it - there
+          // is no "parent".
+          return nullptr;
+        }
+
+        if (currentVariable->GetType() == gd::Variable::Array) {
+          currentVariable = &currentVariable->GetAtIndex(0);
+        } else {
+          currentVariable =
+              currentVariable->GetAllChildren().begin()->second.get();
+        }
+      } else {
+        if (!currentVariable->HasChild(childName)) {
+          // Non existing child - there is no "parent".
+          return nullptr;
+        }
+
+        currentVariable = &currentVariable->GetChild(childName);
+      }
+    }
+
+    // Return the last parent of the chain of variables (so not the last
+    // variable but the one before it).
+    return currentVariable;
+  }
+
+  VariableAndItsParent WalkUntilLastParent(
+      const gd::Variable& variable,
+      const std::vector<gd::String>& childVariableNames,
+      size_t startIndex = 0) {
+    if (bailOutBecauseEmptyVariableName)
+      return {};  // Do not even attempt to find the parent if we had an issue
+                  // when visiting nodes.
+
+    const gd::Variable* currentVariable = &variable;
+
+    // Walk until size - 1 as we want the last parent.
+    for (size_t index = startIndex; index + 1 < childVariableNames.size();
+         ++index) {
+      const gd::String& childName = childVariableNames[index];
+
+      if (childName.empty()) {
+        if (currentVariable->GetChildrenCount() == 0) {
+          // The array or structure is empty, we can't walk through it - there
+          // is no "parent".
+          return {};
+        }
+
+        if (currentVariable->GetType() == gd::Variable::Array) {
+          currentVariable = &currentVariable->GetAtIndex(0);
+        } else {
+          currentVariable =
+              currentVariable->GetAllChildren().begin()->second.get();
+        }
+      } else {
+        if (!currentVariable->HasChild(childName)) {
+          // Non existing child - there is no "parent".
+          return {};
+        }
+
+        currentVariable = &currentVariable->GetChild(childName);
+      }
+    }
+
+    // Return the last parent of the chain of variables (so not the last
+    // variable but the one before it).
+    return {.parentVariable = currentVariable};
+  }
+
+  VariableAndItsParent WalkUntilLastParent(
+      const gd::VariablesContainer& variablesContainer,
+      const std::vector<gd::String>& childVariableNames) {
+    if (bailOutBecauseEmptyVariableName)
+      return {};  // Do not even attempt to find the parent if we had an issue
+                  // when visiting nodes.
+
+    if (variableName.empty())
+      return {};  // There is no "parent" to the variables container itself.
+
+    const gd::Variable* variable = variablesContainer.Has(variableName)
+                                       ? &variablesContainer.Get(variableName)
+                                       : nullptr;
+    if (childVariableNames.empty() || !variable)
+      return {// No child: the parent is the variables container itself.
+              .parentVariablesContainer = &variablesContainer};
+
+    return WalkUntilLastParent(*variable, childVariableNames, 0);
+  }
+
+  const gd::Platform& platform;
+  const gd::ProjectScopedContainers& projectScopedContainers;
+  const gd::String& parameterType;
+  gd::String& objectName;
+  const gd::ExpressionNode* lastNodeToCheck;
+
+  const gd::VariablesContainer* variablesContainer;
+  gd::String variableName;
+  std::vector<gd::String> childVariableNames;
+  bool bailOutBecauseEmptyVariableName;
+};
+
+}  // namespace gd

Core/GDCore/IDE/EventsFunctionTools.cpp

@@ -20,14 +20,9 @@ namespace gd {
 
 void EventsFunctionTools::FreeEventsFunctionToObjectsContainer(
     const gd::Project& project,
-    const gd::EventsFunctionsContainer functionContainer,
+    const gd::EventsFunctionsContainer& functionContainer,
     const gd::EventsFunction& eventsFunction,
-    gd::ObjectsContainer& outputGlobalObjectsContainer,
     gd::ObjectsContainer& outputObjectsContainer) {
-  // Functions don't have access to objects from the "outer" scope.
-  outputGlobalObjectsContainer.GetObjects().clear();
-  outputGlobalObjectsContainer.GetObjectGroups().Clear();
-
   // Functions scope for objects is defined according
   // to parameters
   outputObjectsContainer.GetObjects().clear();
@@ -45,13 +40,11 @@ void EventsFunctionTools::BehaviorEventsFunctionToObjectsContainer(
     const gd::Project& project,
     const gd::EventsBasedBehavior& eventsBasedBehavior,
     const gd::EventsFunction& eventsFunction,
-    gd::ObjectsContainer& outputGlobalObjectsContainer,
     gd::ObjectsContainer& outputObjectsContainer) {
   // The context is build the same way as free function...
   FreeEventsFunctionToObjectsContainer(project,
                                        eventsBasedBehavior.GetEventsFunctions(),
                                        eventsFunction,
-                                       outputGlobalObjectsContainer,
                                        outputObjectsContainer);
 
   // ...and has an "Object" by convention...
@@ -83,13 +76,11 @@ void EventsFunctionTools::ObjectEventsFunctionToObjectsContainer(
     const gd::Project& project,
     const gd::EventsBasedObject& eventsBasedObject,
     const gd::EventsFunction& eventsFunction,
-    gd::ObjectsContainer& outputGlobalObjectsContainer,
     gd::ObjectsContainer& outputObjectsContainer) {
   // The context is build the same way as free function...
   FreeEventsFunctionToObjectsContainer(project,
                                        eventsBasedObject.GetEventsFunctions(),
                                        eventsFunction,
-                                       outputGlobalObjectsContainer,
                                        outputObjectsContainer);
 
   // TODO EBO Use a constant instead a hard coded value "Object".

Core/GDCore/IDE/EventsFunctionTools.h

@@ -3,11 +3,11 @@
  * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#if defined(GD_IDE_ONLY)
-#ifndef EventsFunctionTools_H
-#define EventsFunctionTools_H
+#pragma once 
+
 #include <vector>
 #include "GDCore/String.h"
+
 namespace gd {
 class Project;
 class EventsFunctionsContainer;
@@ -35,10 +35,10 @@ class GD_CORE_API EventsFunctionTools {
    */
   static void FreeEventsFunctionToObjectsContainer(
       const gd::Project& project,
-      const gd::EventsFunctionsContainer functionContainer,
+      const gd::EventsFunctionsContainer& functionContainer,
       const gd::EventsFunction& eventsFunction,
-      gd::ObjectsContainer& outputGlobalObjectsContainer,
       gd::ObjectsContainer& outputObjectsContainer);
+
   /**
    * \brief Given a behavior events function, initialize the given objects container
    * with objects described in the events function parameters, in
@@ -52,8 +52,8 @@ class GD_CORE_API EventsFunctionTools {
       const gd::Project& project,
       const gd::EventsBasedBehavior& eventsBasedBehavior,
       const gd::EventsFunction& eventsFunction,
-      gd::ObjectsContainer& outputGlobalObjectsContainer,
       gd::ObjectsContainer& outputObjectsContainer);
+
   /**
    * \brief Given a parent-object events function, initialize the given objects container
    * with objects described in the events function parameters, in
@@ -67,10 +67,6 @@ class GD_CORE_API EventsFunctionTools {
       const gd::Project& project,
       const gd::EventsBasedObject& eventsBasedObject,
       const gd::EventsFunction& eventsFunction,
-      gd::ObjectsContainer& outputGlobalObjectsContainer,
       gd::ObjectsContainer& outputObjectsContainer);
 };
 }  // namespace gd
-
-#endif  // EventsFunctionTools_H
-#endif

Core/GDCore/IDE/ProjectBrowserHelper.cpp

@@ -148,12 +148,6 @@ void ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(
     gd::ArbitraryEventsWorker &worker) {
     // Add (free) events functions
     for (auto &&eventsFunction : eventsFunctionsExtension.GetInternalVector()) {
-      gd::ObjectsContainer globalObjectsAndGroups;
-      gd::ObjectsContainer objectsAndGroups;
-      gd::EventsFunctionTools::FreeEventsFunctionToObjectsContainer(
-          project, eventsFunctionsExtension, *eventsFunction,
-          globalObjectsAndGroups, objectsAndGroups);
-
       worker.Launch(eventsFunction->GetEvents());
     }
 
@@ -176,14 +170,11 @@ void ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(
     gd::ArbitraryEventsWorkerWithContext &worker) {
     // Add (free) events functions
     for (auto &&eventsFunction : eventsFunctionsExtension.GetInternalVector()) {
-      gd::ObjectsContainer globalObjectsAndGroups;
-      gd::ObjectsContainer objectsAndGroups;
-      gd::EventsFunctionTools::FreeEventsFunctionToObjectsContainer(
-          project, eventsFunctionsExtension, *eventsFunction,
-          globalObjectsAndGroups, objectsAndGroups);
-      auto projectScopedContainers =
-        gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(globalObjectsAndGroups, objectsAndGroups);
-      projectScopedContainers.AddParameters(eventsFunction->GetParametersForEvents(eventsFunctionsExtension));
+      gd::ObjectsContainer parameterObjectsContainer;
+      auto projectScopedContainers = gd::ProjectScopedContainers::
+          MakeNewProjectScopedContainersForFreeEventsFunction(
+              project, eventsFunctionsExtension, *eventsFunction,
+              parameterObjectsContainer);
 
       worker.Launch(eventsFunction->GetEvents(), projectScopedContainers);
     }
@@ -192,13 +183,13 @@ void ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(
     for (auto &&eventsBasedBehavior :
          eventsFunctionsExtension.GetEventsBasedBehaviors()
              .GetInternalVector()) {
-      ExposeEventsBasedBehaviorEvents(project, *eventsBasedBehavior, worker);
+      ExposeEventsBasedBehaviorEvents(project, eventsFunctionsExtension, *eventsBasedBehavior, worker);
     }
 
     // Add (object) events functions
     for (auto &&eventsBasedObject :
          eventsFunctionsExtension.GetEventsBasedObjects().GetInternalVector()) {
-      ExposeEventsBasedObjectEvents(project, *eventsBasedObject, worker);
+      ExposeEventsBasedObjectEvents(project, eventsFunctionsExtension, *eventsBasedObject, worker);
     }
 }
 
@@ -212,20 +203,17 @@ void ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
 }
 
 void ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
-    gd::Project &project, const gd::EventsBasedBehavior &eventsBasedBehavior,
+    gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    const gd::EventsBasedBehavior &eventsBasedBehavior,
     gd::ArbitraryEventsWorkerWithContext &worker) {
   auto &behaviorEventsFunctions = eventsBasedBehavior.GetEventsFunctions();
   for (auto &&eventsFunction : behaviorEventsFunctions.GetInternalVector()) {
-    gd::ObjectsContainer globalObjectsAndGroups;
-    gd::ObjectsContainer objectsAndGroups;
-    gd::EventsFunctionTools::BehaviorEventsFunctionToObjectsContainer(
-        project, eventsBasedBehavior, *eventsFunction, globalObjectsAndGroups,
-        objectsAndGroups);
-    auto projectScopedContainers =
-      gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(globalObjectsAndGroups, objectsAndGroups);
-    projectScopedContainers.AddPropertiesContainer(eventsBasedBehavior.GetSharedPropertyDescriptors());
-    projectScopedContainers.AddPropertiesContainer(eventsBasedBehavior.GetPropertyDescriptors());
-    projectScopedContainers.AddParameters(eventsFunction->GetParametersForEvents(eventsBasedBehavior.GetEventsFunctions()));
+
+    gd::ObjectsContainer parameterObjectsContainers;
+    auto projectScopedContainers = gd::ProjectScopedContainers::
+        MakeNewProjectScopedContainersForBehaviorEventsFunction(
+            project, eventsFunctionsExtension, eventsBasedBehavior,
+            *eventsFunction, parameterObjectsContainers);
 
     worker.Launch(eventsFunction->GetEvents(), projectScopedContainers);
   }
@@ -236,30 +224,23 @@ void ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
     gd::ArbitraryEventsWorker &worker) {
   auto &objectEventsFunctions = eventsBasedObject.GetEventsFunctions();
   for (auto &&eventsFunction : objectEventsFunctions.GetInternalVector()) {
-    gd::ObjectsContainer globalObjectsAndGroups;
-    gd::ObjectsContainer objectsAndGroups;
-    gd::EventsFunctionTools::ObjectEventsFunctionToObjectsContainer(
-        project, eventsBasedObject, *eventsFunction, globalObjectsAndGroups,
-        objectsAndGroups);
-
     worker.Launch(eventsFunction->GetEvents());
   }
 }
 
 void ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
-    gd::Project &project, const gd::EventsBasedObject &eventsBasedObject,
+    gd::Project &project,
+    const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    const gd::EventsBasedObject &eventsBasedObject,
     gd::ArbitraryEventsWorkerWithContext &worker) {
   auto &objectEventsFunctions = eventsBasedObject.GetEventsFunctions();
   for (auto &&eventsFunction : objectEventsFunctions.GetInternalVector()) {
-    gd::ObjectsContainer globalObjectsAndGroups;
-    gd::ObjectsContainer objectsAndGroups;
-    gd::EventsFunctionTools::ObjectEventsFunctionToObjectsContainer(
-        project, eventsBasedObject, *eventsFunction, globalObjectsAndGroups,
-        objectsAndGroups);
-    auto projectScopedContainers =
-      gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(globalObjectsAndGroups, objectsAndGroups);
-    projectScopedContainers.AddPropertiesContainer(eventsBasedObject.GetPropertyDescriptors());
-    projectScopedContainers.AddParameters(eventsFunction->GetParametersForEvents(eventsBasedObject.GetEventsFunctions()));
+
+    gd::ObjectsContainer parameterObjectsContainers;
+    auto projectScopedContainers = gd::ProjectScopedContainers::
+        MakeNewProjectScopedContainersForObjectEventsFunction(
+            project, eventsFunctionsExtension, eventsBasedObject,
+            *eventsFunction, parameterObjectsContainers);
 
     worker.Launch(eventsFunction->GetEvents(), projectScopedContainers);
   }

Core/GDCore/IDE/ProjectBrowserHelper.h

@@ -122,7 +122,9 @@ public:
    * event-based behavior.
    */
   static void ExposeEventsBasedBehaviorEvents(
-      gd::Project &project, const gd::EventsBasedBehavior &eventsBasedBehavior,
+      gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      const gd::EventsBasedBehavior &eventsBasedBehavior,
       gd::ArbitraryEventsWorkerWithContext &worker);
 
   /**
@@ -144,10 +146,11 @@ public:
    * This should be the preferred way to traverse all the events of an
    * event-based object.
    */
-  static void
-  ExposeEventsBasedObjectEvents(gd::Project &project,
-                                const gd::EventsBasedObject &eventsBasedObject,
-                                gd::ArbitraryEventsWorkerWithContext &worker);
+  static void ExposeEventsBasedObjectEvents(
+      gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      const gd::EventsBasedObject &eventsBasedObject,
+      gd::ArbitraryEventsWorkerWithContext &worker);
 
   /**
    * \brief Call the specified worker on all ObjectContainers of the project

Core/GDCore/IDE/ProjectStripper.cpp

@@ -30,14 +30,26 @@ void GD_CORE_API ProjectStripper::StripProjectForExport(gd::Project &project) {
     project.GetLayout(i).GetEvents().Clear();
   }
 
-  // Keep the EventsBasedObject object list because it's useful for the Runtime
+  // Keep:
+  // - the EventsBasedObject object list because it's useful for the Runtime
   // to create the child-object.
+  // - the globalVariables and sceneVariables
   for (unsigned int extensionIndex = 0;
        extensionIndex < project.GetEventsFunctionsExtensionsCount();
        ++extensionIndex) {
     auto &extension = project.GetEventsFunctionsExtension(extensionIndex);
+    extension.SetFullName("");
+    extension.SetShortDescription("");
+    extension.SetDescription("");
+    extension.SetHelpPath("");
+    extension.SetIconUrl("");
+    extension.SetPreviewIconUrl("");
+    extension.SetOrigin("", "");
+    extension.SetVersion("");
     auto &eventsBasedObjects = extension.GetEventsBasedObjects();
-    if (eventsBasedObjects.size() == 0) {
+    if (eventsBasedObjects.size() == 0 &&
+        extension.GetGlobalVariables().Count() == 0 &&
+        extension.GetSceneVariables().Count() == 0) {
       project.RemoveEventsFunctionsExtension(extension.GetName());
       extensionIndex--;
       continue;
@@ -51,6 +63,7 @@ void GD_CORE_API ProjectStripper::StripProjectForExport(gd::Project &project) {
       eventsBasedObject.GetPropertyDescriptors().GetInternalVector().clear();
     }
     extension.GetEventsBasedBehaviors().Clear();
+    extension.ClearEventsFunctions();
   }
 }
 

Core/GDCore/IDE/VariableInstructionSwitcher.cpp

@@ -0,0 +1,241 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "VariableInstructionSwitcher.h"
+
+#include "GDCore/Events/Instruction.h"
+#include "GDCore/IDE/Events/ExpressionVariablePathFinder.h"
+#include "GDCore/Project/Variable.h"
+
+namespace gd {
+
+const gd::String VariableInstructionSwitcher::variableGetterIdentifier =
+    "NumberVariable";
+const gd::String VariableInstructionSwitcher::variableSetterIdentifier =
+    "SetNumberVariable";
+const gd::String VariableInstructionSwitcher::variablePushIdentifier =
+    "PushNumber";
+const gd::String VariableInstructionSwitcher::objectVariableGetterIdentifier =
+    "NumberObjectVariable";
+const gd::String VariableInstructionSwitcher::objectVariableSetterIdentifier =
+    "SetNumberObjectVariable";
+const gd::String VariableInstructionSwitcher::objectVariablePushIdentifier =
+    "PushNumberToObjectVariable";
+const gd::String VariableInstructionSwitcher::unknownInstructionIdentifier = "";
+
+bool VariableInstructionSwitcher::IsSwitchableVariableInstruction(
+    const gd::String &instructionType) {
+  return instructionType == "NumberVariable" ||
+         instructionType == "StringVariable" ||
+         instructionType == "BooleanVariable" ||
+
+         instructionType == "SetNumberVariable" ||
+         instructionType == "SetStringVariable" ||
+         instructionType == "SetBooleanVariable" ||
+
+         instructionType == "PushNumber" || instructionType == "PushString" ||
+         instructionType == "PushBoolean" ||
+
+         IsSwitchableObjectVariableInstruction(instructionType);
+}
+
+bool VariableInstructionSwitcher::IsSwitchableObjectVariableInstruction(
+    const gd::String &instructionType) {
+  return instructionType == "NumberObjectVariable" ||
+         instructionType == "StringObjectVariable" ||
+         instructionType == "BooleanObjectVariable" ||
+
+         instructionType == "SetNumberObjectVariable" ||
+         instructionType == "SetStringObjectVariable" ||
+         instructionType == "SetBooleanObjectVariable" ||
+
+         instructionType == "PushNumberToObjectVariable" ||
+         instructionType == "PushStringToObjectVariable" ||
+         instructionType == "PushBooleanToObjectVariable";
+}
+
+const gd::String &
+VariableInstructionSwitcher::GetSwitchableVariableInstructionIdentifier(
+    const gd::String &instructionType) {
+  return instructionType == "NumberVariable" ||
+                 instructionType == "StringVariable" ||
+                 instructionType == "BooleanVariable"
+             ? VariableInstructionSwitcher::variableGetterIdentifier
+         :
+
+         instructionType == "SetNumberVariable" ||
+                 instructionType == "SetStringVariable" ||
+                 instructionType == "SetBooleanVariable"
+             ? VariableInstructionSwitcher::variableSetterIdentifier
+         :
+
+         instructionType == "PushNumber" || instructionType == "PushString" ||
+                 instructionType == "PushBoolean"
+             ? VariableInstructionSwitcher::variablePushIdentifier
+         :
+
+         instructionType == "NumberObjectVariable" ||
+                 instructionType == "StringObjectVariable" ||
+                 instructionType == "BooleanObjectVariable"
+             ? VariableInstructionSwitcher::objectVariableGetterIdentifier
+         :
+
+         instructionType == "SetNumberObjectVariable" ||
+                 instructionType == "SetStringObjectVariable" ||
+                 instructionType == "SetBooleanObjectVariable"
+             ? VariableInstructionSwitcher::objectVariableSetterIdentifier
+         :
+
+         instructionType == "PushNumberToObjectVariable" ||
+                 instructionType == "PushStringToObjectVariable" ||
+                 instructionType == "PushBooleanToObjectVariable"
+             ? VariableInstructionSwitcher::objectVariablePushIdentifier
+             :
+
+             VariableInstructionSwitcher::unknownInstructionIdentifier;
+}
+
+const gd::Variable::Type
+VariableInstructionSwitcher::GetSwitchableInstructionVariableType(
+    const gd::String &instructionType) {
+  return instructionType == "NumberVariable" ||
+                 instructionType == "SetNumberVariable" ||
+                 instructionType == "PushNumber" ||
+                 instructionType == "NumberObjectVariable" ||
+                 instructionType == "SetNumberObjectVariable" ||
+                 instructionType == "PushNumberToObjectVariable"
+             ? gd::Variable::Number
+         :
+
+         instructionType == "StringVariable" ||
+                 instructionType == "SetStringVariable" ||
+                 instructionType == "PushString" ||
+                 instructionType == "StringObjectVariable" ||
+                 instructionType == "SetStringObjectVariable" ||
+                 instructionType == "PushStringToObjectVariable"
+             ? gd::Variable::String
+         :
+
+         instructionType == "BooleanVariable" ||
+                 instructionType == "SetBooleanVariable" ||
+                 instructionType == "PushBoolean" ||
+                 instructionType == "BooleanObjectVariable" ||
+                 instructionType == "SetBooleanObjectVariable" ||
+                 instructionType == "PushBooleanToObjectVariable"
+             ? gd::Variable::Boolean
+             :
+
+             gd::Variable::Unknown;
+}
+
+void VariableInstructionSwitcher::SwitchVariableInstructionType(
+    gd::Instruction &instruction, const gd::Variable::Type variableType) {
+  if (instruction.GetType() == "NumberVariable" ||
+      instruction.GetType() == "StringVariable" ||
+      instruction.GetType() == "BooleanVariable") {
+    if (variableType == gd::Variable::Type::Number) {
+      instruction.SetType("NumberVariable");
+    } else if (variableType == gd::Variable::Type::String) {
+      instruction.SetType("StringVariable");
+    } else if (variableType == gd::Variable::Type::Boolean) {
+      instruction.SetType("BooleanVariable");
+    }
+  } else if (instruction.GetType() == "SetNumberVariable" ||
+             instruction.GetType() == "SetStringVariable" ||
+             instruction.GetType() == "SetBooleanVariable") {
+    if (variableType == gd::Variable::Type::Number) {
+      instruction.SetType("SetNumberVariable");
+    } else if (variableType == gd::Variable::Type::String) {
+      instruction.SetType("SetStringVariable");
+    } else if (variableType == gd::Variable::Type::Boolean) {
+      instruction.SetType("SetBooleanVariable");
+    }
+  } else if (instruction.GetType() == "PushNumber" ||
+             instruction.GetType() == "PushString" ||
+             instruction.GetType() == "PushBoolean") {
+    if (variableType == gd::Variable::Type::Number) {
+      instruction.SetType("PushNumber");
+    } else if (variableType == gd::Variable::Type::String) {
+      instruction.SetType("PushString");
+    } else if (variableType == gd::Variable::Type::Boolean) {
+      instruction.SetType("PushBoolean");
+    }
+  } else if (instruction.GetType() == "NumberObjectVariable" ||
+             instruction.GetType() == "StringObjectVariable" ||
+             instruction.GetType() == "BooleanObjectVariable") {
+    if (variableType == gd::Variable::Type::Number) {
+      instruction.SetType("NumberObjectVariable");
+    } else if (variableType == gd::Variable::Type::String) {
+      instruction.SetType("StringObjectVariable");
+    } else if (variableType == gd::Variable::Type::Boolean) {
+      instruction.SetType("BooleanObjectVariable");
+    }
+  } else if (instruction.GetType() == "SetNumberObjectVariable" ||
+             instruction.GetType() == "SetStringObjectVariable" ||
+             instruction.GetType() == "SetBooleanObjectVariable") {
+    if (variableType == gd::Variable::Type::Number) {
+      instruction.SetType("SetNumberObjectVariable");
+    } else if (variableType == gd::Variable::Type::String) {
+      instruction.SetType("SetStringObjectVariable");
+    } else if (variableType == gd::Variable::Type::Boolean) {
+      instruction.SetType("SetBooleanObjectVariable");
+    }
+  } else if (instruction.GetType() == "PushNumberToObjectVariable" ||
+             instruction.GetType() == "PushStringToObjectVariable" ||
+             instruction.GetType() == "PushBooleanToObjectVariable") {
+    if (variableType == gd::Variable::Type::Number) {
+      instruction.SetType("PushNumberToObjectVariable");
+    } else if (variableType == gd::Variable::Type::String) {
+      instruction.SetType("PushStringToObjectVariable");
+    } else if (variableType == gd::Variable::Type::Boolean) {
+      instruction.SetType("PushBooleanToObjectVariable");
+    }
+  }
+}
+
+const gd::Variable::Type
+VariableInstructionSwitcher::GetVariableTypeFromParameters(
+    const gd::Platform &platform,
+    const gd::ProjectScopedContainers &projectScopedContainers,
+    const gd::Instruction &instruction) {
+  if (instruction.GetParametersCount() < 2 ||
+      !gd::VariableInstructionSwitcher::IsSwitchableVariableInstruction(
+          instruction.GetType())) {
+    return gd::Variable::Type::Unknown;
+  }
+  const bool isObjectVariable =
+      gd::VariableInstructionSwitcher::IsSwitchableObjectVariableInstruction(
+          instruction.GetType());
+  const gd::String &objectName =
+      isObjectVariable ? instruction.GetParameter(0).GetPlainString() : "";
+
+  const std::size_t variableParameterIndex = isObjectVariable ? 1 : 0;
+  auto &variableExpressionNode =
+      *instruction.GetParameter(variableParameterIndex).GetRootNode();
+
+  auto variableType = gd::ExpressionVariablePathFinder::GetVariableType(
+      platform, projectScopedContainers, variableExpressionNode, objectName);
+  return variableType == gd::Variable::Type::Array
+             ? // "Push" actions need the child type to be able to switch.
+             gd::ExpressionVariablePathFinder::GetArrayVariableType(
+                 platform, projectScopedContainers, variableExpressionNode,
+                 objectName)
+             : variableType;
+}
+
+void VariableInstructionSwitcher::SwitchBetweenUnifiedInstructionIfNeeded(
+    const gd::Platform &platform,
+    const gd::ProjectScopedContainers &projectScopedContainers,
+    gd::Instruction &instruction) {
+  const auto variableType =
+      gd::VariableInstructionSwitcher::GetVariableTypeFromParameters(
+          platform, projectScopedContainers, instruction);
+  if (variableType != gd::Variable::Type::Unknown) {
+    gd::VariableInstructionSwitcher::SwitchVariableInstructionType(
+        instruction, variableType);
+  }
+}
+
+} // namespace gd

Core/GDCore/IDE/VariableInstructionSwitcher.h

@@ -0,0 +1,91 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#pragma once
+#include "GDCore/Project/Variable.h"
+#include "GDCore/String.h"
+
+namespace gd {
+class Instruction;
+class Platform;
+class ProjectScopedContainers;
+} // namespace gd
+
+namespace gd {
+/**
+ * Events set and check variables with sets of 3 instructions for:
+ * - number
+ * - string
+ * - boolean
+ *
+ * Users only see 1 instruction. The editor automatically switches between the 3
+ * instructions according to the variable type.
+ */
+class GD_CORE_API VariableInstructionSwitcher {
+public:
+  /**
+   * \brief Return true if the instruction is a variable getter or setter
+   * (including object variable instructions).
+   */
+  static bool
+  IsSwitchableVariableInstruction(const gd::String &instructionType);
+
+  /**
+   * \brief Return true if the instruction is an object variable getter or
+   * setter.
+   */
+  static bool
+  IsSwitchableObjectVariableInstruction(const gd::String &instructionType);
+
+  /**
+   * \brief Return the common identifier for variable getter or setter or an
+   * empty string otherwise.
+   *
+   * The instruction type of the "number" one is actually used as the common
+   * identifier.
+   */
+  static const gd::String &
+  GetSwitchableVariableInstructionIdentifier(const gd::String &instructionType);
+
+  /**
+   * \brief Return the variable type for variable getter or setter.
+   */
+  static const gd::Variable::Type
+  GetSwitchableInstructionVariableType(const gd::String &instructionType);
+
+  /**
+   * \brief Modify the instruction type to match the given variable type.
+   */
+  static void
+  SwitchVariableInstructionType(gd::Instruction &instruction,
+                                const gd::Variable::Type variableType);
+
+  /**
+   * \brief Return the variable type of the instruction parameter.
+   */
+  static const gd::Variable::Type GetVariableTypeFromParameters(
+      const gd::Platform &platform,
+      const gd::ProjectScopedContainers &projectScopedContainers,
+      const gd::Instruction &instruction);
+
+  /**
+   * \brief Modify the instruction type to match the variable type of the
+   * instruction parameter.
+   */
+  static void SwitchBetweenUnifiedInstructionIfNeeded(
+      const gd::Platform &platform,
+      const gd::ProjectScopedContainers &projectScopedContainers,
+      gd::Instruction &instruction);
+
+private:
+  static const gd::String variableGetterIdentifier;
+  static const gd::String variableSetterIdentifier;
+  static const gd::String variablePushIdentifier;
+  static const gd::String objectVariableGetterIdentifier;
+  static const gd::String objectVariableSetterIdentifier;
+  static const gd::String objectVariablePushIdentifier;
+  static const gd::String unknownInstructionIdentifier;
+};
+} // namespace gd

Core/GDCore/IDE/WholeProjectRefactorer.cpp

@@ -19,12 +19,14 @@
 #include "GDCore/IDE/Events/EventsPropertyReplacer.h"
 #include "GDCore/IDE/Events/EventsRefactorer.h"
 #include "GDCore/IDE/Events/EventsVariableReplacer.h"
+#include "GDCore/IDE/Events/EventsVariableInstructionTypeSwitcher.h"
 #include "GDCore/IDE/Events/ExpressionsParameterMover.h"
 #include "GDCore/IDE/Events/ExpressionsRenamer.h"
 #include "GDCore/IDE/Events/InstructionsParameterMover.h"
 #include "GDCore/IDE/Events/InstructionsTypeRenamer.h"
 #include "GDCore/IDE/Events/LinkEventTargetRenamer.h"
 #include "GDCore/IDE/Events/ProjectElementRenamer.h"
+#include "GDCore/IDE/Events/BehaviorParametersFiller.h"
 #include "GDCore/IDE/EventsFunctionTools.h"
 #include "GDCore/IDE/Project/ArbitraryBehaviorSharedDataWorker.h"
 #include "GDCore/IDE/Project/ArbitraryEventBasedBehaviorsWorker.h"
@@ -140,7 +142,6 @@ void WholeProjectRefactorer::EnsureObjectEventsFunctionsProperParameters(
 
 VariablesChangeset
 WholeProjectRefactorer::ComputeChangesetForVariablesContainer(
-    gd::Project &project,
     const gd::SerializerElement &oldSerializedVariablesContainer,
     const gd::VariablesContainer &newVariablesContainer) {
   gd::VariablesChangeset changeset;
@@ -180,6 +181,20 @@ WholeProjectRefactorer::ComputeChangesetForVariablesContainer(
         changeset.oldToNewVariableNames[oldName] = variableName;
       }
 
+      const auto &oldVariable = oldVariablesContainer.Get(oldName);
+      if (gd::WholeProjectRefactorer::HasAnyVariableTypeChanged(oldVariable, variable)) {
+        changeset.typeChangedVariableNames.insert(variableName);
+      }
+
+      const auto &variablesRenamingChangesetNode =
+          gd::WholeProjectRefactorer::ComputeChangesetForVariable(oldVariable,
+                                                                  variable);
+
+      if (variablesRenamingChangesetNode) {
+        changeset.modifiedVariables[oldName] =
+            std::move(variablesRenamingChangesetNode);
+      }
+
       // Renamed or not, this is not a removed variable.
       removedUuidAndNames.erase(variable.GetPersistentUuid());
     }
@@ -192,14 +207,124 @@ WholeProjectRefactorer::ComputeChangesetForVariablesContainer(
   return changeset;
 }
 
+std::shared_ptr<VariablesRenamingChangesetNode>
+WholeProjectRefactorer::ComputeChangesetForVariable(
+    const gd::Variable &oldVariable, const gd::Variable &newVariable) {
+
+  if (newVariable.GetChildrenCount() == 0 ||
+      oldVariable.GetChildrenCount() == 0) {
+    return std::shared_ptr<VariablesRenamingChangesetNode>(nullptr);
+  }
+
+  std::unordered_map<gd::String, gd::String> oldVariableNamesByUuid;
+  for (const auto &pair : oldVariable.GetAllChildren()) {
+    const auto &oldName = pair.first;
+    const auto oldChild = pair.second;
+
+    // All variables are candidate to be removed.
+    oldVariableNamesByUuid[oldChild->GetPersistentUuid()] = oldName;
+  }
+
+  auto changeset = std::make_shared<VariablesRenamingChangesetNode>();
+  for (const auto &pair : newVariable.GetAllChildren()) {
+    const auto &newName = pair.first;
+    const auto newChild = pair.second;
+
+    auto existingOldVariableUuidAndName =
+        oldVariableNamesByUuid.find(newChild->GetPersistentUuid());
+    if (existingOldVariableUuidAndName == oldVariableNamesByUuid.end()) {
+      // This is a new variable.
+      continue;
+    }
+    const gd::String &oldName = existingOldVariableUuidAndName->second;
+    const auto &oldChild = oldVariable.GetChild(oldName);
+
+    if (oldName != newName) {
+      // This is a renamed child.
+      changeset->oldToNewVariableNames[oldName] = newName;
+    }
+
+    const auto &childChangeset =
+        gd::WholeProjectRefactorer::ComputeChangesetForVariable(oldChild,
+                                                                *newChild);
+    if (childChangeset) {
+      changeset->modifiedVariables[oldName] = std::move(childChangeset);
+    }
+  }
+  if (changeset->modifiedVariables.size() == 0 &&
+      changeset->oldToNewVariableNames.size() == 0) {
+    return std::shared_ptr<VariablesRenamingChangesetNode>(nullptr);
+  }
+  return std::move(changeset);
+};
+
+bool WholeProjectRefactorer::HasAnyVariableTypeChanged(
+    const gd::Variable &oldVariable, const gd::Variable &newVariable) {
+  if (newVariable.GetType() != oldVariable.GetType()) {
+    return true;
+  }
+
+  if (newVariable.GetChildrenCount() == 0 ||
+      oldVariable.GetChildrenCount() == 0) {
+    return false;
+  }
+
+  std::unordered_map<gd::String, gd::String> oldVariableNamesByUuid;
+  for (const auto &pair : oldVariable.GetAllChildren()) {
+    const auto &oldName = pair.first;
+    const auto oldChild = pair.second;
+
+    // All variables are candidate to be removed.
+    oldVariableNamesByUuid[oldChild->GetPersistentUuid()] = oldName;
+  }
+
+  for (const auto &pair : newVariable.GetAllChildren()) {
+    const auto &newName = pair.first;
+    const auto newChild = pair.second;
+
+    auto existingOldVariableUuidAndName =
+        oldVariableNamesByUuid.find(newChild->GetPersistentUuid());
+    if (existingOldVariableUuidAndName == oldVariableNamesByUuid.end()) {
+      // This is a new variable.
+      continue;
+    }
+    const gd::String &oldName = existingOldVariableUuidAndName->second;
+    const auto &oldChild = oldVariable.GetChild(oldName);
+
+    if (gd::WholeProjectRefactorer::HasAnyVariableTypeChanged(oldChild,
+                                                              *newChild)) {
+      return true;
+    }
+  }
+  return false;
+}
+
 void WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
-    gd::Project &project, const gd::VariablesContainer &newVariablesContainer,
-    const gd::VariablesChangeset &changeset) {
+    gd::Project &project, gd::VariablesContainer &variablesContainer,
+    const gd::VariablesChangeset &changeset,
+    const gd::SerializerElement &originalSerializedVariables) {
+  // Revert changes
+  gd::SerializerElement editedSerializedVariables;
+  variablesContainer.SerializeTo(editedSerializedVariables);
+  variablesContainer.UnserializeFrom(originalSerializedVariables);
+
+  // Rename and remove variables
   gd::EventsVariableReplacer eventsVariableReplacer(
-      project.GetCurrentPlatform(), newVariablesContainer,
-      changeset.oldToNewVariableNames, changeset.removedVariableNames);
+      project.GetCurrentPlatform(), variablesContainer,
+      changeset, changeset.removedVariableNames);
   gd::ProjectBrowserHelper::ExposeProjectEvents(project,
                                                 eventsVariableReplacer);
+
+  // Apply back changes
+  variablesContainer.UnserializeFrom(editedSerializedVariables);
+
+  // Switch types of instructions
+  gd::EventsVariableInstructionTypeSwitcher
+      eventsVariableInstructionTypeSwitcher(project.GetCurrentPlatform(),
+                                            variablesContainer,
+                                            changeset.typeChangedVariableNames);
+  gd::ProjectBrowserHelper::ExposeProjectEvents(
+      project, eventsVariableInstructionTypeSwitcher);
 }
 
 void WholeProjectRefactorer::UpdateExtensionNameInEventsBasedBehavior(
@@ -208,7 +333,7 @@ void WholeProjectRefactorer::UpdateExtensionNameInEventsBasedBehavior(
     gd::EventsBasedBehavior &eventsBasedBehavior,
     const gd::String &sourceExtensionName) {
   const EventBasedBehaviorBrowser eventBasedBehaviorExposer(
-      eventsBasedBehavior);
+      eventsFunctionsExtension, eventsBasedBehavior);
   WholeProjectRefactorer::RenameEventsFunctionsExtension(
       project, eventsFunctionsExtension, sourceExtensionName,
       eventsFunctionsExtension.GetName(), eventBasedBehaviorExposer);
@@ -724,7 +849,7 @@ void WholeProjectRefactorer::RenameEventsBasedBehaviorProperty(
                                               oldPropertyName, newPropertyName);
 
     gd::ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
-        project, eventsBasedBehavior, behaviorRenamer);
+        project, eventsFunctionsExtension, eventsBasedBehavior, behaviorRenamer);
   } else {
     // Properties that represent primitive values will be used through
     // their related actions/conditions/expressions. Rename these.
@@ -794,7 +919,7 @@ void WholeProjectRefactorer::RenameEventsBasedBehaviorSharedProperty(
                                               oldPropertyName, newPropertyName);
 
     gd::ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
-        project, eventsBasedBehavior, behaviorRenamer);
+        project, eventsFunctionsExtension, eventsBasedBehavior, behaviorRenamer);
   } else {
     // Properties that represent primitive values will be used through
     // their related actions/conditions/expressions. Rename these.
@@ -1391,53 +1516,38 @@ void WholeProjectRefactorer::DoRenameObject(
   projectBrowser.ExposeFunctions(project, objectParameterRenamer);
 }
 
-void WholeProjectRefactorer::ObjectOrGroupRemovedInLayout(
-    gd::Project &project, gd::Layout &layout, const gd::String &objectName,
-    bool isObjectGroup, bool removeEventsAndGroups) {
+void WholeProjectRefactorer::ObjectRemovedInLayout(
+    gd::Project &project, gd::Layout &layout, const gd::String &objectName) {
   auto projectScopedContainers = gd::ProjectScopedContainers::
       MakeNewProjectScopedContainersForProjectAndLayout(project, layout);
 
-  // Remove object in the current layout
-  if (removeEventsAndGroups) {
-    gd::EventsRefactorer::RemoveObjectInEvents(project.GetCurrentPlatform(),
-                                               projectScopedContainers,
-                                               layout.GetEvents(), objectName);
-  }
-  if (!isObjectGroup) { // Object groups can't have instances or be in other
-                        // groups
-    if (removeEventsAndGroups) {
-      for (std::size_t g = 0; g < layout.GetObjectGroups().size(); ++g) {
-        if (layout.GetObjectGroups()[g].Find(objectName))
-          layout.GetObjectGroups()[g].RemoveObject(objectName);
-      }
-    }
-    layout.GetInitialInstances().RemoveInitialInstancesOfObject(objectName);
-  }
-
-  // Remove object in external events
-  if (removeEventsAndGroups) {
-    for (auto &externalEventsName :
-         GetAssociatedExternalEvents(project, layout.GetName())) {
-      auto &externalEvents = project.GetExternalEvents(externalEventsName);
-
-      gd::EventsRefactorer::RemoveObjectInEvents(
-          project.GetCurrentPlatform(), projectScopedContainers,
-          externalEvents.GetEvents(), objectName);
-    }
+  // Object groups can't have instances or be in other groups
+  for (std::size_t g = 0; g < layout.GetObjectGroups().size(); ++g) {
+    if (layout.GetObjectGroups()[g].Find(objectName))
+      layout.GetObjectGroups()[g].RemoveObject(objectName);
   }
+  layout.GetInitialInstances().RemoveInitialInstancesOfObject(objectName);
 
   // Remove object in external layouts
-  if (!isObjectGroup) { // Object groups can't have instances
-    std::vector<gd::String> externalLayoutsNames =
-        GetAssociatedExternalLayouts(project, layout);
-    for (gd::String name : externalLayoutsNames) {
-      auto &externalLayout = project.GetExternalLayout(name);
-      externalLayout.GetInitialInstances().RemoveInitialInstancesOfObject(
-          objectName);
-    }
+  std::vector<gd::String> externalLayoutsNames =
+      GetAssociatedExternalLayouts(project, layout);
+  for (gd::String name : externalLayoutsNames) {
+    auto &externalLayout = project.GetExternalLayout(name);
+    externalLayout.GetInitialInstances().RemoveInitialInstancesOfObject(
+        objectName);
   }
 }
 
+void WholeProjectRefactorer::BehaviorsAddedToObjectInLayout(
+    gd::Project &project, gd::Layout &layout, const gd::String &objectName) {
+  auto projectScopedContainers = gd::ProjectScopedContainers::
+      MakeNewProjectScopedContainersForProjectAndLayout(project, layout);
+  gd::BehaviorParametersFiller behaviorParameterFiller(
+      project.GetCurrentPlatform(), projectScopedContainers);
+  gd::ProjectBrowserHelper::ExposeLayoutEventsAndExternalEvents(
+      project, layout, behaviorParameterFiller);
+}
+
 void WholeProjectRefactorer::ObjectOrGroupRenamedInLayout(
     gd::Project &project, gd::Layout &layout, const gd::String &oldName,
     const gd::String &newName, bool isObjectGroup) {
@@ -1605,45 +1715,28 @@ void WholeProjectRefactorer::RenameObjectEffect(gd::Project &project,
       project, layout, projectElementRenamer);
 }
 
-void WholeProjectRefactorer::ObjectOrGroupRemovedInEventsBasedObject(
+void WholeProjectRefactorer::ObjectRemovedInEventsBasedObject(
     gd::Project &project, gd::EventsBasedObject &eventsBasedObject,
     gd::ObjectsContainer &globalObjectsContainer,
-    gd::ObjectsContainer &objectsContainer, const gd::String &objectName,
-    bool isObjectGroup, bool removeEventsAndGroups) {
+    gd::ObjectsContainer &objectsContainer, const gd::String &objectName) {
   for (auto &functionUniquePtr :
        eventsBasedObject.GetEventsFunctions().GetInternalVector()) {
     auto function = functionUniquePtr.get();
-    WholeProjectRefactorer::ObjectOrGroupRemovedInEventsFunction(
+    WholeProjectRefactorer::ObjectRemovedInEventsFunction(
         project, *function, globalObjectsContainer, objectsContainer,
-        objectName, isObjectGroup, isObjectGroup);
+        objectName);
   }
 }
 
-void WholeProjectRefactorer::ObjectOrGroupRemovedInEventsFunction(
+void WholeProjectRefactorer::ObjectRemovedInEventsFunction(
     gd::Project &project, gd::EventsFunction &eventsFunction,
     gd::ObjectsContainer &globalObjectsContainer,
-    gd::ObjectsContainer &objectsContainer, const gd::String &objectName,
-    bool isObjectGroup, bool removeEventsAndGroups) {
-  // In theory we should pass a ProjectScopedContainers to this function so it
-  // does not have to construct one. In practice, this is ok because we only
-  // deal with objects.
-  auto projectScopedContainers =
-      gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(
-          globalObjectsContainer, objectsContainer);
+    gd::ObjectsContainer &objectsContainer, const gd::String &objectName) {
 
-  if (removeEventsAndGroups) {
-    gd::EventsRefactorer::RemoveObjectInEvents(
-        project.GetCurrentPlatform(), projectScopedContainers,
-        eventsFunction.GetEvents(), objectName);
-  }
-  if (!isObjectGroup) { // Object groups can't be in other groups
-    if (removeEventsAndGroups) {
-      for (std::size_t g = 0; g < eventsFunction.GetObjectGroups().size();
-           ++g) {
-        if (eventsFunction.GetObjectGroups()[g].Find(objectName))
-          eventsFunction.GetObjectGroups()[g].RemoveObject(objectName);
-      }
-    }
+  for (std::size_t g = 0; g < eventsFunction.GetObjectGroups().size();
+        ++g) {
+    if (eventsFunction.GetObjectGroups()[g].Find(objectName))
+      eventsFunction.GetObjectGroups()[g].RemoveObject(objectName);
   }
 }
 
@@ -1676,7 +1769,8 @@ void WholeProjectRefactorer::ObjectOrGroupRenamedInEventsFunction(
       project.GetCurrentPlatform(), projectScopedContainers,
       eventsFunction.GetEvents(), oldName, newName);
 
-  if (!isObjectGroup) { // Object groups can't be in other groups
+  // Object groups can't be in other groups
+  if (!isObjectGroup) {
     for (std::size_t g = 0; g < eventsFunction.GetObjectGroups().size(); ++g) {
       eventsFunction.GetObjectGroups()[g].RenameObject(oldName, newName);
     }
@@ -1686,7 +1780,8 @@ void WholeProjectRefactorer::ObjectOrGroupRenamedInEventsFunction(
 void WholeProjectRefactorer::GlobalObjectOrGroupRenamed(
     gd::Project &project, const gd::String &oldName, const gd::String &newName,
     bool isObjectGroup) {
-  if (!isObjectGroup) { // Object groups can't be in other groups
+  // Object groups can't be in other groups
+  if (!isObjectGroup) {
     for (std::size_t g = 0; g < project.GetObjectGroups().size(); ++g) {
       project.GetObjectGroups()[g].RenameObject(oldName, newName);
     }
@@ -1702,15 +1797,10 @@ void WholeProjectRefactorer::GlobalObjectOrGroupRenamed(
   }
 }
 
-void WholeProjectRefactorer::GlobalObjectOrGroupRemoved(
-    gd::Project &project, const gd::String &objectName, bool isObjectGroup,
-    bool removeEventsAndGroups) {
-  if (!isObjectGroup) { // Object groups can't be in other groups
-    if (removeEventsAndGroups) {
-      for (std::size_t g = 0; g < project.GetObjectGroups().size(); ++g) {
-        project.GetObjectGroups()[g].RemoveObject(objectName);
-      }
-    }
+void WholeProjectRefactorer::GlobalObjectRemoved(
+    gd::Project &project, const gd::String &objectName) {
+  for (std::size_t g = 0; g < project.GetObjectGroups().size(); ++g) {
+    project.GetObjectGroups()[g].RemoveObject(objectName);
   }
 
   for (std::size_t i = 0; i < project.GetLayoutsCount(); ++i) {
@@ -1718,8 +1808,18 @@ void WholeProjectRefactorer::GlobalObjectOrGroupRemoved(
     if (layout.HasObjectNamed(objectName))
       continue;
 
-    ObjectOrGroupRemovedInLayout(project, layout, objectName, isObjectGroup,
-                                 removeEventsAndGroups);
+    ObjectRemovedInLayout(project, layout, objectName);
+  }
+}
+
+void WholeProjectRefactorer::BehaviorsAddedToGlobalObject(
+    gd::Project &project, const gd::String &objectName) {
+  for (std::size_t i = 0; i < project.GetLayoutsCount(); ++i) {
+    gd::Layout &layout = project.GetLayout(i);
+    if (layout.HasObjectNamed(objectName))
+      continue;
+
+    BehaviorsAddedToObjectInLayout(project, layout, objectName);
   }
 }
 

Core/GDCore/IDE/WholeProjectRefactorer.h

@@ -9,7 +9,10 @@
 #include <unordered_set>
 #include <unordered_map>
 #include <vector>
+#include <memory>
 #include "GDCore/String.h"
+#include "GDCore/Project/Variable.h"
+
 namespace gd {
 class Platform;
 class Project;
@@ -34,13 +37,26 @@ class BehaviorMetadata;
 class UnfilledRequiredBehaviorPropertyProblem;
 class ProjectBrowser;
 class SerializerElement;
+struct VariablesRenamingChangesetNode;
 }  // namespace gd
 
 namespace gd {
 
-struct VariablesChangeset {
-  std::unordered_set<gd::String> removedVariableNames;
+struct VariablesRenamingChangesetNode {
   std::unordered_map<gd::String, gd::String> oldToNewVariableNames;
+  std::unordered_map<gd::String, std::shared_ptr<gd::VariablesRenamingChangesetNode>>
+      modifiedVariables;
+};
+
+struct VariablesChangeset : VariablesRenamingChangesetNode {
+  std::unordered_set<gd::String> removedVariableNames;
+
+  /**
+   * No distinction is done between a change of the variable itself or its
+   * children. Ensuring that a child is actually the one with a type change
+   * would take more time than checking the instruction type is rightly set.
+   */
+  std::unordered_set<gd::String> typeChangedVariableNames;
 
   bool HasRemovedVariables() { return !removedVariableNames.empty(); }
 
@@ -51,8 +67,8 @@ struct VariablesChangeset {
  * \brief Tool functions to do refactoring on the whole project after
  * changes like deletion or renaming of an object.
  *
- * \TODO Ideally ObjectOrGroupRenamedInLayout, ObjectOrGroupRemovedInLayout,
- * GlobalObjectOrGroupRenamed, GlobalObjectOrGroupRemoved would be implemented
+ * \TODO Ideally ObjectOrGroupRenamedInLayout, ObjectRemovedInLayout,
+ * GlobalObjectOrGroupRenamed, GlobalObjectRemoved would be implemented
  * using ExposeProjectEvents.
  */
 class GD_CORE_API WholeProjectRefactorer {
@@ -62,7 +78,6 @@ class GD_CORE_API WholeProjectRefactorer {
    * \brief Compute the changes made on the variables of a variable container.
    */
   static VariablesChangeset ComputeChangesetForVariablesContainer(
-    gd::Project &project,
     const gd::SerializerElement &oldSerializedVariablesContainer,
     const gd::VariablesContainer &newVariablesContainer);
 
@@ -71,9 +86,9 @@ class GD_CORE_API WholeProjectRefactorer {
    * made to variables.
    */
   static void ApplyRefactoringForVariablesContainer(
-    gd::Project &project,
-    const gd::VariablesContainer &newVariablesContainer,
-    const gd::VariablesChangeset& changeset);
+      gd::Project &project, gd::VariablesContainer &variablesContainer,
+      const gd::VariablesChangeset &changeset,
+      const gd::SerializerElement &originalSerializedVariables);
 
   /**
    * \brief Refactor the project **before** an events function extension is
@@ -376,11 +391,21 @@ class GD_CORE_API WholeProjectRefactorer {
    * This will update the layout, all external layouts associated with it
    * and all external events associated with it.
    */
-  static void ObjectOrGroupRemovedInLayout(gd::Project& project,
+  static void ObjectRemovedInLayout(gd::Project& project,
                                            gd::Layout& layout,
-                                           const gd::String& objectName,
-                                           bool isObjectGroup,
-                                           bool removeEventsAndGroups = true);
+                                           const gd::String& objectName);
+
+  /**
+   * \brief Refactor the project after behaviors are added to an object in a
+   * layout.
+   *
+   * This will update the layout, all external events associated with it.
+   * The refactor is actually applied to all objects because it allow to handle
+   * groups.
+   */
+  static void BehaviorsAddedToObjectInLayout(gd::Project &project,
+                                             gd::Layout &layout,
+                                             const gd::String &objectName);
 
   /**
    * \brief Refactor the project after an object is removed in an events-based
@@ -388,14 +413,12 @@ class GD_CORE_API WholeProjectRefactorer {
    *
    * This will update the events of the function and groups.
    */
-  static void ObjectOrGroupRemovedInEventsBasedObject(
+  static void ObjectRemovedInEventsBasedObject(
       gd::Project& project,
       gd::EventsBasedObject& eventsBasedObject,
       gd::ObjectsContainer& globalObjectsContainer,
       gd::ObjectsContainer& objectsContainer,
-      const gd::String& objectName,
-      bool isObjectGroup,
-      bool removeEventsAndGroups);
+      const gd::String& objectName);
 
   /**
    * \brief Refactor the events function after an object or group is renamed
@@ -429,14 +452,12 @@ class GD_CORE_API WholeProjectRefactorer {
    *
    * This will update the events of the function and groups.
    */
-  static void ObjectOrGroupRemovedInEventsFunction(
+  static void ObjectRemovedInEventsFunction(
       gd::Project& project,
       gd::EventsFunction& eventsFunction,
       gd::ObjectsContainer& globalObjectsContainer,
       gd::ObjectsContainer& objectsContainer,
-      const gd::String& objectName,
-      bool isObjectGroup,
-      bool removeEventsAndGroups = true);
+      const gd::String& objectName);
 
   /**
    * \brief Refactor the project after a global object is renamed.
@@ -455,10 +476,18 @@ class GD_CORE_API WholeProjectRefactorer {
    * This will update all the layouts, all external layouts associated with them
    * and all external events used by the layouts.
    */
-  static void GlobalObjectOrGroupRemoved(gd::Project& project,
-                                         const gd::String& objectName,
-                                         bool isObjectGroup,
-                                         bool removeEventsAndGroups = true);
+  static void GlobalObjectRemoved(gd::Project& project,
+                                         const gd::String& objectName);
+
+  /**
+   * \brief Refactor the project after behaviors are added a global object.
+   *
+   * This will update all the layouts, all external events associated with them.
+   * The refactor is actually applied to all objects because it allow to handle
+   * groups.
+   */
+  void BehaviorsAddedToGlobalObject(gd::Project &project,
+                                    const gd::String &objectName);
 
   /**
    * \brief Return the set of all the types of the objects that are using the
@@ -555,6 +584,13 @@ class GD_CORE_API WholeProjectRefactorer {
       const gd::String& behaviorName,
       std::unordered_set<gd::String>& dependentBehaviorNames);
 
+  static std::shared_ptr<VariablesRenamingChangesetNode>
+  ComputeChangesetForVariable(const gd::Variable &oldVariable,
+                              const gd::Variable &newVariable);
+
+  static bool HasAnyVariableTypeChanged(const gd::Variable &oldVariable,
+                                        const gd::Variable &newVariable);
+
   static const gd::String behaviorObjectParameterName;
   static const gd::String parentObjectParameterName;
 

Core/GDCore/Project/CustomObjectConfiguration.cpp

@@ -13,12 +13,14 @@
 #include "GDCore/Serialization/SerializerElement.h"
 #include "GDCore/Tools/Log.h"
 #include "GDCore/Project/CustomConfigurationHelper.h"
+#include "GDCore/Project/InitialInstance.h"
 
 using namespace gd;
 
 void CustomObjectConfiguration::Init(const gd::CustomObjectConfiguration& objectConfiguration) {
   project = objectConfiguration.project;
   objectContent = objectConfiguration.objectContent;
+  animations = objectConfiguration.animations;
 
   // There is no default copy for a map of unique_ptr like childObjectConfigurations.
   childObjectConfigurations.clear();
@@ -88,23 +90,38 @@ bool CustomObjectConfiguration::UpdateProperty(const gd::String& propertyName,
 
 std::map<gd::String, gd::PropertyDescriptor>
 CustomObjectConfiguration::GetInitialInstanceProperties(
-    const gd::InitialInstance& instance,
-    gd::Project& project,
-    gd::Layout& scene) {
-  return std::map<gd::String, gd::PropertyDescriptor>();
+    const gd::InitialInstance &initialInstance, gd::Project &project,
+    gd::Layout &scene) {
+  std::map<gd::String, gd::PropertyDescriptor> properties;
+  if (!animations.HasNoAnimations()) {
+    properties["animation"] =
+        gd::PropertyDescriptor(
+            gd::String::From(initialInstance.GetRawDoubleProperty("animation")))
+            .SetLabel(_("Animation"))
+            .SetType("number");
+  }
+  return properties;
 }
 
 bool CustomObjectConfiguration::UpdateInitialInstanceProperty(
-    gd::InitialInstance& instance,
-    const gd::String& name,
-    const gd::String& value,
-    gd::Project& project,
-    gd::Layout& scene) {
-  return false;
+    gd::InitialInstance &initialInstance, const gd::String &name,
+    const gd::String &value, gd::Project &project, gd::Layout &scene) {
+  if (name == "animation") {
+    initialInstance.SetRawDoubleProperty(
+        "animation", std::max(0, value.empty() ? 0 : value.To<int>()));
+  }
+
+  return true;
 }
 
 void CustomObjectConfiguration::DoSerializeTo(SerializerElement& element) const {
   element.AddChild("content") = objectContent;
+
+  if (!animations.HasNoAnimations()) {
+    auto &animatableElement = element.AddChild("animatable");
+    animations.SerializeTo(animatableElement);
+  }
+
   auto &childrenContentElement = element.AddChild("childrenContent");
   for (auto &pair : childObjectConfigurations) {
     auto &childName = pair.first;
@@ -116,6 +133,12 @@ void CustomObjectConfiguration::DoSerializeTo(SerializerElement& element) const
 void CustomObjectConfiguration::DoUnserializeFrom(Project& project,
                                                const SerializerElement& element) {
   objectContent = element.GetChild("content");
+
+  if (element.HasChild("animatable")) {
+    auto &animatableElement = element.GetChild("animatable");
+    animations.UnserializeFrom(animatableElement);
+  }
+
   auto &childrenContentElement = element.GetChild("childrenContent");
   for (auto &pair : childrenContentElement.GetAllChildren()) {
     auto &childName = pair.first;
@@ -126,6 +149,8 @@ void CustomObjectConfiguration::DoUnserializeFrom(Project& project,
 }
 
 void CustomObjectConfiguration::ExposeResources(gd::ArbitraryResourceWorker& worker) {
+  animations.ExposeResources(worker);
+
   std::map<gd::String, gd::PropertyDescriptor> properties = GetProperties();
 
   for (auto& property : properties) {
@@ -178,3 +203,11 @@ void CustomObjectConfiguration::ExposeResources(gd::ArbitraryResourceWorker& wor
     configuration.ExposeResources(worker);
   }
 }
+
+const SpriteAnimationList& CustomObjectConfiguration::GetAnimations() const {
+  return animations;
+}
+
+SpriteAnimationList& CustomObjectConfiguration::GetAnimations() {
+  return animations;
+}

Core/GDCore/Project/CustomObjectConfiguration.h

@@ -3,8 +3,7 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_CUSTOMOBJECTCONFIGURATION_H
-#define GDCORE_CUSTOMOBJECTCONFIGURATION_H
+#pragma once
 
 #include "GDCore/Project/ObjectConfiguration.h"
 
@@ -16,7 +15,7 @@
 #include "GDCore/Project/PropertyDescriptor.h"
 #include "GDCore/Serialization/Serializer.h"
 #include "GDCore/Serialization/SerializerElement.h"
-
+#include "GDCore/Extensions/Builtin/SpriteExtension/SpriteAnimationList.h"
 
 using namespace gd;
 
@@ -72,7 +71,17 @@ class CustomObjectConfiguration : public gd::ObjectConfiguration {
 
   gd::ObjectConfiguration &GetChildObjectConfiguration(const gd::String& objectName);
 
- protected:
+  /**
+   * \brief Return the animation configuration for Animatable custom objects.
+   */
+  const SpriteAnimationList& GetAnimations() const;
+
+  /**
+   * @brief Return the animation configuration for Animatable custom objects.
+   */
+  SpriteAnimationList& GetAnimations();
+
+protected:
   void DoSerializeTo(SerializerElement& element) const override;
   void DoUnserializeFrom(Project& project, const SerializerElement& element) override;
 
@@ -84,6 +93,8 @@ class CustomObjectConfiguration : public gd::ObjectConfiguration {
 
   static gd::ObjectConfiguration badObjectConfiguration;
 
+  SpriteAnimationList animations;
+
   /**
    * Initialize configuration using another configuration. Used by copy-ctor
    * and assign-op.
@@ -95,6 +106,5 @@ class CustomObjectConfiguration : public gd::ObjectConfiguration {
    */
   void Init(const gd::CustomObjectConfiguration& object);
 };
-}  // namespace gd
 
-#endif  // GDCORE_CUSTOMOBJECTCONFIGURATION_H
+}  // namespace gd

Core/GDCore/Project/EventsBasedObject.cpp

@@ -14,7 +14,9 @@ EventsBasedObject::EventsBasedObject()
         "MyObject",
         gd::EventsFunctionsContainer::FunctionOwner::Object),
     ObjectsContainer(),
-    isRenderedIn3D(false) {
+    isRenderedIn3D(false),
+    isAnimatable(false),
+    isTextContainer(false) {
 }
 
 EventsBasedObject::~EventsBasedObject() {}
@@ -31,6 +33,12 @@ void EventsBasedObject::SerializeTo(SerializerElement& element) const {
   if (isRenderedIn3D) {
     element.SetBoolAttribute("is3D", true);
   }
+  if (isAnimatable) {
+    element.SetBoolAttribute("isAnimatable", true);
+  }
+  if (isTextContainer) {
+    element.SetBoolAttribute("isTextContainer", true);
+  }
 
   AbstractEventsBasedEntity::SerializeTo(element);
   SerializeObjectsTo(element.AddChild("objects"));
@@ -41,6 +49,8 @@ void EventsBasedObject::UnserializeFrom(gd::Project& project,
                                         const SerializerElement& element) {
   defaultName = element.GetStringAttribute("defaultName");
   isRenderedIn3D = element.GetBoolAttribute("is3D", false);
+  isAnimatable = element.GetBoolAttribute("isAnimatable", false);
+  isTextContainer = element.GetBoolAttribute("isTextContainer", false);
 
   AbstractEventsBasedEntity::UnserializeFrom(project, element);
   UnserializeObjectsFrom(project, element.GetChild("objects"));

Core/GDCore/Project/EventsBasedObject.h

@@ -85,6 +85,32 @@ class GD_CORE_API EventsBasedObject: public AbstractEventsBasedEntity, public Ob
    */
   bool IsRenderedIn3D() const { return isRenderedIn3D; }
 
+  /**
+   * \brief Declare an Animatable capability.
+   */
+  EventsBasedObject& MarkAsAnimatable(bool isAnimatable_) {
+    isAnimatable = isAnimatable_;
+    return *this;
+  }
+
+  /**
+   * \brief Return true if the object needs an Animatable capability.
+   */
+  bool IsAnimatable() const { return isAnimatable; }
+
+  /**
+   * \brief Declare a TextContainer capability.
+   */
+  EventsBasedObject& MarkAsTextContainer(bool isTextContainer_) {
+    isTextContainer = isTextContainer_;
+    return *this;
+  }
+
+  /**
+   * \brief Return true if the object needs a TextContainer capability.
+   */
+  bool IsTextContainer() const { return isTextContainer; }
+
   void SerializeTo(SerializerElement& element) const override;
 
   void UnserializeFrom(gd::Project& project,
@@ -93,6 +119,8 @@ class GD_CORE_API EventsBasedObject: public AbstractEventsBasedEntity, public Ob
  private:
   gd::String defaultName;
   bool isRenderedIn3D;
+  bool isAnimatable;
+  bool isTextContainer;
 };
 
 }  // namespace gd

Core/GDCore/Project/EventsFunctionsContainer.h

@@ -107,6 +107,7 @@ public:
     return Insert(object, position);
   }
   void RemoveEventsFunction(const gd::String& name) { return Remove(name); }
+  void ClearEventsFunctions() { return Clear(); }
   void MoveEventsFunction(std::size_t oldIndex, std::size_t newIndex) {
     return Move(oldIndex, newIndex);
   };

Core/GDCore/Project/EventsFunctionsExtension.cpp

@@ -15,7 +15,9 @@ namespace gd {
 
 EventsFunctionsExtension::EventsFunctionsExtension() :
     gd::EventsFunctionsContainer(
-        gd::EventsFunctionsContainer::FunctionOwner::Extension) {}
+        gd::EventsFunctionsContainer::FunctionOwner::Extension),
+      globalVariables(gd::VariablesContainer::SourceType::ExtensionGlobal),
+      sceneVariables(gd::VariablesContainer::SourceType::ExtensionScene) {}
 
 EventsFunctionsExtension::EventsFunctionsExtension(
     const EventsFunctionsExtension& other) :
@@ -48,6 +50,8 @@ void EventsFunctionsExtension::Init(const gd::EventsFunctionsExtension& other) {
   EventsFunctionsContainer::Init(other);
   eventsBasedBehaviors = other.eventsBasedBehaviors;
   eventsBasedObjects = other.eventsBasedObjects;
+  globalVariables = other.GetGlobalVariables();
+  sceneVariables = other.GetSceneVariables();
 }
 
 void EventsFunctionsExtension::SerializeTo(SerializerElement& element) const {
@@ -82,6 +86,9 @@ void EventsFunctionsExtension::SerializeTo(SerializerElement& element) const {
   for (auto& dependency : dependencies)
     SerializeDependencyTo(dependency, dependenciesElement.AddChild(""));
 
+  GetGlobalVariables().SerializeTo(element.AddChild("globalVariables"));
+  GetSceneVariables().SerializeTo(element.AddChild("sceneVariables"));
+
   SerializeEventsFunctionsTo(element.AddChild("eventsFunctions"));
   eventsBasedBehaviors.SerializeElementsTo(
       "eventsBasedBehavior", element.AddChild("eventsBasedBehaviors"));
@@ -147,6 +154,9 @@ void EventsFunctionsExtension::UnserializeExtensionDeclarationFrom(
   for (size_t i = 0; i < dependenciesElement.GetChildrenCount(); ++i)
     dependencies.push_back(
         UnserializeDependencyFrom(dependenciesElement.GetChild(i)));
+  
+  globalVariables.UnserializeFrom(element.GetChild("globalVariables"));
+  sceneVariables.UnserializeFrom(element.GetChild("sceneVariables"));
 
   // Only unserialize behaviors and objects names.
   // As event based objects can contains objects using CustomBehavior and/or

Core/GDCore/Project/EventsFunctionsExtension.h

@@ -3,8 +3,7 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_EVENTSFUNCTIONEXTENSION_H
-#define GDCORE_EVENTSFUNCTIONEXTENSION_H
+#pragma once
 
 #include <vector>
 
@@ -12,6 +11,7 @@
 #include "GDCore/Project/EventsBasedBehavior.h"
 #include "GDCore/Project/EventsBasedObject.h"
 #include "GDCore/Project/EventsFunctionsContainer.h"
+#include "GDCore/Project/VariablesContainer.h"
 #include "GDCore/String.h"
 #include "GDCore/Tools/SerializableWithNameList.h"
 namespace gd {
@@ -216,6 +216,41 @@ class GD_CORE_API EventsFunctionsExtension : public EventsFunctionsContainer {
 
   ///@}
 
+  /** \name Variable management
+   * Members functions related to layout variables management.
+   */
+  ///@{
+
+  /**
+   * Return the global variables of the extension (variables scoped to the
+   * entire game lifetime).
+   */
+  inline const gd::VariablesContainer& GetGlobalVariables() const {
+    return globalVariables;
+  }
+
+  /**
+   * Return the global variables of the extension (variables scoped to the
+   * entire game lifetime).
+   */
+  inline gd::VariablesContainer& GetGlobalVariables() { return globalVariables; }
+
+  /**
+   * Return the global variables of the extension (variables scoped to the
+   * lifetime of a scene).
+   */
+  inline const gd::VariablesContainer& GetSceneVariables() const {
+    return sceneVariables;
+  }
+
+  /**
+   * Return the global variables of the extension (variables scoped to the
+   * lifetime of a scene).
+   */
+  inline gd::VariablesContainer& GetSceneVariables() { return sceneVariables; }
+
+  ///@}
+
   /** \name Serialization
    */
   ///@{
@@ -298,8 +333,9 @@ class GD_CORE_API EventsFunctionsExtension : public EventsFunctionsContainer {
   gd::SerializableWithNameList<EventsBasedBehavior> eventsBasedBehaviors;
   gd::SerializableWithNameList<EventsBasedObject> eventsBasedObjects;
   std::vector<gd::DependencyMetadata> dependencies;
+  
+  gd::VariablesContainer globalVariables;
+  gd::VariablesContainer sceneVariables;
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_EVENTSFUNCTIONEXTENSION_H

Core/GDCore/Project/InitialInstance.cpp

@@ -15,7 +15,7 @@
 
 namespace gd {
 
-gd::String* InitialInstance::badStringProperyValue = NULL;
+gd::String* InitialInstance::badStringPropertyValue = NULL;
 
 InitialInstance::InitialInstance()
     : objectName(""),
@@ -34,6 +34,7 @@ InitialInstance::InitialInstance()
       depth(0),
       locked(false),
       sealed(false),
+      keepRatio(true),
       persistentUuid(UUID::MakeUuid4()) {}
 
 void InitialInstance::UnserializeFrom(const SerializerElement& element) {
@@ -58,6 +59,7 @@ void InitialInstance::UnserializeFrom(const SerializerElement& element) {
   SetLayer(element.GetStringAttribute("layer"));
   SetLocked(element.GetBoolAttribute("locked", false));
   SetSealed(element.GetBoolAttribute("sealed", false));
+  SetShouldKeepRatio(element.GetBoolAttribute("keepRatio", false));
 
   persistentUuid = element.GetStringAttribute("persistentUuid");
   if (persistentUuid.empty()) ResetPersistentUuid();
@@ -120,6 +122,7 @@ void InitialInstance::SerializeTo(SerializerElement& element) const {
   if (HasCustomDepth()) element.SetAttribute("depth", GetCustomDepth());
   if (IsLocked()) element.SetAttribute("locked", IsLocked());
   if (IsSealed()) element.SetAttribute("sealed", IsSealed());
+  if (ShouldKeepRatio()) element.SetAttribute("keepRatio", ShouldKeepRatio());
 
   if (persistentUuid.empty()) persistentUuid = UUID::MakeUuid4();
   element.SetStringAttribute("persistentUuid", persistentUuid);
@@ -188,10 +191,10 @@ double InitialInstance::GetRawDoubleProperty(const gd::String& name) const {
 
 const gd::String& InitialInstance::GetRawStringProperty(
     const gd::String& name) const {
-  if (!badStringProperyValue) badStringProperyValue = new gd::String("");
+  if (!badStringPropertyValue) badStringPropertyValue = new gd::String("");
 
   const auto& it = stringProperties.find(name);
-  return it != stringProperties.end() ? it->second : *badStringProperyValue;
+  return it != stringProperties.end() ? it->second : *badStringPropertyValue;
 }
 
 void InitialInstance::SetRawDoubleProperty(const gd::String& name,

Core/GDCore/Project/InitialInstance.h

@@ -206,6 +206,17 @@ class GD_CORE_API InitialInstance {
    */
   void SetSealed(bool enable = true) { sealed = enable; }
 
+  /**
+   * \brief Return true if the dimensions (width, height and depth) should keep
+   * the same ratio.
+   */
+  bool ShouldKeepRatio() const { return keepRatio; };
+
+  /**
+   * \brief Define if instance's dimensions should keep the same ratio.
+   */
+  void SetShouldKeepRatio(bool enable = true) { keepRatio = enable; }
+
   ///@}
 
   /** \name Variable management
@@ -340,11 +351,13 @@ class GD_CORE_API InitialInstance {
   gd::VariablesContainer initialVariables;  ///< Instance specific variables
   bool locked;                              ///< True if the instance is locked
   bool sealed;                              ///< True if the instance is sealed
+  bool keepRatio;                           ///< True if the instance's dimensions
+                                            ///  should keep the same ratio.
   mutable gd::String persistentUuid;  ///< A persistent random version 4 UUID,
-                                      ///< useful for hot reloading.
+                                      ///  useful for hot reloading.
 
   static gd::String*
-      badStringProperyValue;  ///< Empty string returned by GetRawStringProperty
+      badStringPropertyValue;  ///< Empty string returned by GetRawStringProperty
 };
 
 }  // namespace gd

Core/GDCore/Project/Layout.cpp

@@ -53,7 +53,8 @@ Layout::Layout()
       stopSoundsOnStartup(true),
       standardSortMethod(true),
       disableInputWhenNotFocused(true),
-      profiler(NULL)
+      profiler(NULL),
+      variables(gd::VariablesContainer::SourceType::Scene)
 {
   gd::Layer layer;
   layer.SetCameraCount(1);
@@ -518,11 +519,13 @@ gd::String GD_CORE_API GetTypeOfObject(const gd::ObjectsContainer& project,
 void GD_CORE_API FilterBehaviorNamesFromObject(
     const gd::Object &object, const gd::String &behaviorType,
     std::vector<gd::String> &behaviorNames) {
-  for (size_t i = 0; i < behaviorNames.size(); i++) {
+  for (size_t i = 0; i < behaviorNames.size();) {
     auto &behaviorName = behaviorNames[i];
     if (!object.HasBehaviorNamed(behaviorName) ||
         object.GetBehavior(behaviorName).GetTypeName() != behaviorType) {
       behaviorNames.erase(behaviorNames.begin() + i);
+    } else {
+      ++i;
     }
   }
 }

Core/GDCore/Project/Layout.h

@@ -4,8 +4,8 @@
  * reserved. This project is released under the MIT License.
  */
 
-#ifndef GDCORE_LAYOUT_H
-#define GDCORE_LAYOUT_H
+#pragma once
+
 #include <map>
 #include <memory>
 #include <vector>
@@ -504,5 +504,3 @@ GetBehaviorsOfObject(const ObjectsContainer& game,
 }  // namespace gd
 
 typedef gd::Layout Scene;
-
-#endif  // GDCORE_LAYOUT_H

Core/GDCore/Project/Object.cpp

@@ -24,14 +24,18 @@ Object::~Object() {}
 Object::Object(const gd::String& name_,
                const gd::String& type_,
                std::unique_ptr<gd::ObjectConfiguration> configuration_)
-    : name(name_), configuration(std::move(configuration_)) {
+    : name(name_),
+      configuration(std::move(configuration_)),
+      objectVariables(gd::VariablesContainer::SourceType::Object) {
       SetType(type_);
     }
 
 Object::Object(const gd::String& name_,
                const gd::String& type_,
                gd::ObjectConfiguration* configuration_)
-    : name(name_), configuration(configuration_) {
+    : name(name_),
+      configuration(configuration_),
+      objectVariables(gd::VariablesContainer::SourceType::Object) {
       SetType(type_);
     }
 

Core/GDCore/Project/Object.h

@@ -3,8 +3,8 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_OBJECT_H
-#define GDCORE_OBJECT_H
+#pragma once
+
 #include <map>
 #include <memory>
 #include <vector>
@@ -287,5 +287,3 @@ struct ObjectHasName : public std::binary_function<std::unique_ptr<gd::Object>,
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_OBJECT_H

Core/GDCore/Project/ObjectsContainersList.cpp

@@ -12,6 +12,12 @@
 
 namespace gd {
 
+ObjectsContainersList
+ObjectsContainersList::MakeNewEmptyObjectsContainersList() {
+  ObjectsContainersList objectsContainersList;
+  return objectsContainersList;
+}
+
 ObjectsContainersList
 ObjectsContainersList::MakeNewObjectsContainersListForProjectAndLayout(
     const gd::Project& project, const gd::Layout& layout) {
@@ -21,6 +27,14 @@ ObjectsContainersList::MakeNewObjectsContainersListForProjectAndLayout(
   return objectsContainersList;
 }
 
+ObjectsContainersList
+ObjectsContainersList::MakeNewObjectsContainersListForProject(
+    const gd::Project& project) {
+  ObjectsContainersList objectsContainersList;
+  objectsContainersList.Add(project);
+  return objectsContainersList;
+}
+
 ObjectsContainersList
 ObjectsContainersList::MakeNewObjectsContainersListForContainers(
     const gd::ObjectsContainer& globalObjectsContainer,
@@ -31,6 +45,14 @@ ObjectsContainersList::MakeNewObjectsContainersListForContainers(
   return objectsContainersList;
 }
 
+ObjectsContainersList
+ObjectsContainersList::MakeNewObjectsContainersListForContainer(
+    const gd::ObjectsContainer& objectsContainer) {
+  ObjectsContainersList objectsContainersList;
+  objectsContainersList.Add(objectsContainer);
+  return objectsContainersList;
+}
+
 bool ObjectsContainersList::HasObjectOrGroupNamed(
     const gd::String& name) const {
   for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
@@ -370,7 +392,7 @@ void ObjectsContainersList::ForEachObject(
 
 gd::String ObjectsContainersList::GetTypeOfObject(
     const gd::String& objectName) const {
-  if (objectsContainers.size() != 2) {
+  if (objectsContainers.size() > 2) {
     std::cout << this << std::endl;
     std::cout << objectsContainers.size() << std::endl;
     // TODO: rework forwarded methods so they can work with any number of
@@ -379,19 +401,40 @@ gd::String ObjectsContainersList::GetTypeOfObject(
         "ObjectsContainersList::GetTypeOfObject called with objectsContainers "
         "not being exactly 2. This is a logical error and will crash.");
   }
+  if (objectsContainers.size() == 0) {
+    gd::LogWarning("ObjectsContainersList::GetTypeOfObject called without any "
+                   "objectsContainer");
+    return "";
+  }
+  if (objectsContainers.size() == 1) {
+    gd::ObjectsContainer emptyObjectsContainer;
+    return gd::GetTypeOfObject(emptyObjectsContainer, *objectsContainers[0],
+                               objectName, true);
+  }
   return gd::GetTypeOfObject(
       *objectsContainers[0], *objectsContainers[1], objectName, true);
 }
 
 bool ObjectsContainersList::HasBehaviorInObjectOrGroup(
     const gd::String& objectOrGroupName, const gd::String& behaviorName) const {
-  if (objectsContainers.size() != 2) {
+  if (objectsContainers.size() > 2) {
     // TODO: rework forwarded methods so they can work with any number of
     // containers.
     gd::LogFatalError(
-        "ObjectsContainersList::GetTypeOfObject called with objectsContainers "
+        "ObjectsContainersList::HasBehaviorInObjectOrGroup called with objectsContainers "
         "not being exactly 2. This is a logical error and will crash.");
   }
+  if (objectsContainers.size() == 0) {
+    gd::LogWarning("ObjectsContainersList::HasBehaviorInObjectOrGroup called without any "
+                   "objectsContainer");
+    return false;
+  }
+  if (objectsContainers.size() == 1) {
+    gd::ObjectsContainer emptyObjectsContainer;
+    return gd::HasBehaviorInObjectOrGroup(
+        emptyObjectsContainer, *objectsContainers[0], objectOrGroupName,
+        behaviorName, true);
+  }
   return gd::HasBehaviorInObjectOrGroup(*objectsContainers[0],
                                         *objectsContainers[1],
                                         objectOrGroupName,
@@ -403,13 +446,24 @@ gd::String ObjectsContainersList::GetTypeOfBehaviorInObjectOrGroup(
     const gd::String& objectOrGroupName,
     const gd::String& behaviorName,
     bool searchInGroups) const {
-  if (objectsContainers.size() != 2) {
+  if (objectsContainers.size() > 2) {
     // TODO: rework forwarded methods so they can work with any number of
     // containers.
     gd::LogFatalError(
-        "ObjectsContainersList::GetTypeOfObject called with objectsContainers "
+        "ObjectsContainersList::GetTypeOfBehaviorInObjectOrGroup called with objectsContainers "
         "not being exactly 2. This is a logical error and will crash.");
   }
+  if (objectsContainers.size() == 0) {
+    gd::LogWarning("ObjectsContainersList::GetTypeOfBehaviorInObjectOrGroup called without any "
+                   "objectsContainer");
+    return "";
+  }
+  if (objectsContainers.size() == 1) {
+    gd::ObjectsContainer emptyObjectsContainer;
+    return gd::GetTypeOfBehaviorInObjectOrGroup(
+        emptyObjectsContainer, *objectsContainers[0], objectOrGroupName,
+        behaviorName, searchInGroups);
+  }
   return gd::GetTypeOfBehaviorInObjectOrGroup(*objectsContainers[0],
                                               *objectsContainers[1],
                                               objectOrGroupName,
@@ -419,13 +473,23 @@ gd::String ObjectsContainersList::GetTypeOfBehaviorInObjectOrGroup(
 
 gd::String ObjectsContainersList::GetTypeOfBehavior(
     const gd::String& behaviorName, bool searchInGroups) const {
-  if (objectsContainers.size() != 2) {
+  if (objectsContainers.size() > 2) {
     // TODO: rework forwarded methods so they can work with any number of
     // containers.
     gd::LogFatalError(
-        "ObjectsContainersList::GetTypeOfObject called with objectsContainers "
+        "ObjectsContainersList::GetTypeOfBehavior called with objectsContainers "
         "not being exactly 2. This is a logical error and will crash.");
   }
+  if (objectsContainers.size() == 0) {
+    gd::LogWarning("ObjectsContainersList::GetTypeOfBehavior called without any "
+                   "objectsContainer");
+    return "";
+  }
+  if (objectsContainers.size() == 1) {
+    gd::ObjectsContainer emptyObjectsContainer;
+    return gd::GetTypeOfBehavior(emptyObjectsContainer, *objectsContainers[0],
+                                 behaviorName, searchInGroups);
+  }
   return gd::GetTypeOfBehavior(*objectsContainers[0],
                                *objectsContainers[1],
                                behaviorName,
@@ -434,14 +498,25 @@ gd::String ObjectsContainersList::GetTypeOfBehavior(
 
 std::vector<gd::String> ObjectsContainersList::GetBehaviorsOfObject(
     const gd::String& objectName, bool searchInGroups) const {
-  if (objectsContainers.size() != 2) {
+  if (objectsContainers.size() > 2) {
     // TODO: rework forwarded methods so they can work with any number of
     // containers.
     gd::LogFatalError(
-        "ObjectsContainersList::GetTypeOfObject called with objectsContainers "
+        "ObjectsContainersList::GetBehaviorsOfObject called with objectsContainers "
         "not being exactly 2. This is a logical error and will crash.");
   }
-
+  if (objectsContainers.size() == 0) {
+    gd::LogWarning("ObjectsContainersList::GetBehaviorsOfObject called without any "
+                   "objectsContainer");
+    std::vector<gd::String> behaviors;
+    return behaviors;
+  }
+  if (objectsContainers.size() == 1) {
+    gd::ObjectsContainer emptyObjectsContainer;
+    return gd::GetBehaviorsOfObject(emptyObjectsContainer,
+                                    *objectsContainers[0], objectName,
+                                    searchInGroups);
+  }
   return gd::GetBehaviorsOfObject(
       *objectsContainers[0], *objectsContainers[1], objectName, searchInGroups);
 }

Core/GDCore/Project/ObjectsContainersList.h

@@ -30,13 +30,21 @@ class GD_CORE_API ObjectsContainersList {
  public:
   virtual ~ObjectsContainersList(){};
 
+  static ObjectsContainersList MakeNewEmptyObjectsContainersList();
+
   static ObjectsContainersList MakeNewObjectsContainersListForProjectAndLayout(
       const gd::Project& project, const gd::Layout& layout);
 
+  static ObjectsContainersList MakeNewObjectsContainersListForProject(
+      const gd::Project& project);
+
   static ObjectsContainersList MakeNewObjectsContainersListForContainers(
       const gd::ObjectsContainer& globalObjectsContainer,
       const gd::ObjectsContainer& objectsContainer);
 
+  static ObjectsContainersList MakeNewObjectsContainersListForContainer(
+      const gd::ObjectsContainer& objectsContainer);
+
   /**
    * \brief Check if the specified object or group exists.
    */

Core/GDCore/Project/Project.cpp

@@ -75,7 +75,8 @@ Project::Project()
       currentPlatform(NULL),
       gdMajorVersion(gd::VersionWrapper::Major()),
       gdMinorVersion(gd::VersionWrapper::Minor()),
-      gdBuildVersion(gd::VersionWrapper::Build()) {}
+      gdBuildVersion(gd::VersionWrapper::Build()),
+      variables(gd::VariablesContainer::SourceType::Global) {}
 
 Project::~Project() {}
 
@@ -102,30 +103,19 @@ std::unique_ptr<gd::Object> Project::CreateObject(
     behavior->SetDefaultBehavior(true);
   };
 
-  if (project.HasEventsBasedObject(objectType)) {
-    // During project deserialization, event-based object metadata are not yet
-    // generated.
-    addDefaultBehavior("EffectCapability::EffectBehavior");
-    addDefaultBehavior("ResizableCapability::ResizableBehavior");
-    addDefaultBehavior("ScalableCapability::ScalableBehavior");
-    addDefaultBehavior("FlippableCapability::FlippableBehavior");
-    auto& eventBasedObject = project.GetEventsBasedObject(objectType);
-    if (eventBasedObject.IsRenderedIn3D()) {
-      addDefaultBehavior("Scene3D::Base3DBehavior");
-    }
-    else {
-      addDefaultBehavior("OpacityCapability::OpacityBehavior");
-    }
-  } else {
-    auto& objectMetadata =
-        gd::MetadataProvider::GetObjectMetadata(platform, objectType);
-    if (MetadataProvider::IsBadObjectMetadata(objectMetadata)) {
-      gd::LogWarning("Object: " + name + " has an unknown type: " + objectType);
-    }
-    for (auto& behaviorType : objectMetadata.GetDefaultBehaviors()) {
+  auto &objectMetadata =
+      gd::MetadataProvider::GetObjectMetadata(platform, objectType);
+  if (!MetadataProvider::IsBadObjectMetadata(objectMetadata)) {
+    for (auto &behaviorType : objectMetadata.GetDefaultBehaviors()) {
       addDefaultBehavior(behaviorType);
     }
   }
+  // During project deserialization, event-based object metadata are not yet
+  // generated. Default behaviors will be added by
+  // MetadataDeclarationHelper::UpdateCustomObjectDefaultBehaviors
+  else if (!project.HasEventsBasedObject(objectType)) {
+    gd::LogWarning("Object: " + name + " has an unknown type: " + objectType);
+  }
 
   return std::move(object);
 }

Core/GDCore/Project/Project.h

@@ -4,11 +4,12 @@
  * reserved. This project is released under the MIT License.
  */
 
-#ifndef GDCORE_PROJECT_H
-#define GDCORE_PROJECT_H
+#pragma once
+
 #include <memory>
 #include <vector>
 
+#include "GDCore/Events/CodeGeneration/DiagnosticReport.h"
 #include "GDCore/Project/ExtensionProperties.h"
 #include "GDCore/Project/LoadingScreen.h"
 #include "GDCore/Project/ObjectGroupsContainer.h"
@@ -1050,6 +1051,10 @@ class GD_CORE_API Project : public ObjectsContainer {
                                       std::size_t position = -1);
   ///@}
 
+  gd::WholeProjectDiagnosticReport& GetWholeProjectDiagnosticReport() {
+    return wholeProjectDiagnosticReport;
+  }
+
  private:
   /**
    * Initialize from another game. Used by copy-ctor and assign-op.
@@ -1125,6 +1130,7 @@ class GD_CORE_API Project : public ObjectsContainer {
       externalEvents;  ///< List of all externals events
   ExtensionProperties
       extensionProperties;              ///< The properties of the extensions.
+  gd::WholeProjectDiagnosticReport wholeProjectDiagnosticReport;
   mutable unsigned int gdMajorVersion;  ///< The GD major version used the last
                                         ///< time the project was saved.
   mutable unsigned int gdMinorVersion;  ///< The GD minor version used the last
@@ -1134,5 +1140,3 @@ class GD_CORE_API Project : public ObjectsContainer {
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_PROJECT_H

Core/GDCore/Project/ProjectScopedContainers.cpp

@@ -0,0 +1,116 @@
+#include "ProjectScopedContainers.h"
+
+#include "GDCore/IDE/EventsFunctionTools.h"
+#include "GDCore/Project/EventsFunctionsExtension.h"
+#include "GDCore/Project/EventsBasedBehavior.h"
+#include "GDCore/Project/EventsBasedObject.h"
+#include "GDCore/Project/ObjectsContainer.h"
+#include "GDCore/Events/Event.h"
+
+namespace gd {
+
+ProjectScopedContainers
+ProjectScopedContainers::MakeNewProjectScopedContainersForEventsFunctionsExtension(
+    const gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension) {
+
+  ProjectScopedContainers projectScopedContainers(
+      ObjectsContainersList::MakeNewEmptyObjectsContainersList(),
+      VariablesContainersList::
+          MakeNewVariablesContainersListForEventsFunctionsExtension(eventsFunctionsExtension),
+      PropertiesContainersList::MakeNewEmptyPropertiesContainersList());
+
+  return projectScopedContainers;
+};
+
+ProjectScopedContainers
+ProjectScopedContainers::MakeNewProjectScopedContainersForFreeEventsFunction(
+    const gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    const gd::EventsFunction &eventsFunction,
+    gd::ObjectsContainer &parameterObjectsContainer) {
+
+  gd::EventsFunctionTools::FreeEventsFunctionToObjectsContainer(
+      project, eventsFunctionsExtension, eventsFunction, parameterObjectsContainer);
+
+  ProjectScopedContainers projectScopedContainers(
+      ObjectsContainersList::MakeNewObjectsContainersListForContainer(
+          parameterObjectsContainer),
+      VariablesContainersList::
+          MakeNewVariablesContainersListForEventsFunctionsExtension(eventsFunctionsExtension),
+      PropertiesContainersList::MakeNewEmptyPropertiesContainersList());
+
+  projectScopedContainers.AddParameters(
+      eventsFunction.GetParametersForEvents(eventsFunctionsExtension));
+
+  return projectScopedContainers;
+};
+
+ProjectScopedContainers
+ProjectScopedContainers::MakeNewProjectScopedContainersForBehaviorEventsFunction(
+    const gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    const gd::EventsBasedBehavior& eventsBasedBehavior,
+    const gd::EventsFunction &eventsFunction,
+    gd::ObjectsContainer &parameterObjectsContainer) {
+
+  gd::EventsFunctionTools::BehaviorEventsFunctionToObjectsContainer(
+      project,
+      eventsBasedBehavior,
+      eventsFunction,
+      parameterObjectsContainer);
+
+  ProjectScopedContainers projectScopedContainers(
+      ObjectsContainersList::MakeNewObjectsContainersListForContainer(
+          parameterObjectsContainer),
+      VariablesContainersList::
+          MakeNewVariablesContainersListForEventsFunctionsExtension(eventsFunctionsExtension),
+      PropertiesContainersList::MakeNewEmptyPropertiesContainersList());
+
+  projectScopedContainers.AddPropertiesContainer(
+      eventsBasedBehavior.GetSharedPropertyDescriptors());
+  projectScopedContainers.AddPropertiesContainer(
+      eventsBasedBehavior.GetPropertyDescriptors());
+  projectScopedContainers.AddParameters(eventsFunction.GetParametersForEvents(
+      eventsBasedBehavior.GetEventsFunctions()));
+
+  return projectScopedContainers;
+}
+
+ProjectScopedContainers
+ProjectScopedContainers::MakeNewProjectScopedContainersForObjectEventsFunction(
+    const gd::Project &project,
+    const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    const gd::EventsBasedObject &eventsBasedObject,
+    const gd::EventsFunction &eventsFunction,
+    gd::ObjectsContainer &parameterObjectsContainer) {
+
+  gd::EventsFunctionTools::ObjectEventsFunctionToObjectsContainer(
+      project, eventsBasedObject, eventsFunction, parameterObjectsContainer);
+
+  ProjectScopedContainers projectScopedContainers(
+      ObjectsContainersList::MakeNewObjectsContainersListForContainer(
+          parameterObjectsContainer),
+      VariablesContainersList::
+          MakeNewVariablesContainersListForEventsFunctionsExtension(
+              eventsFunctionsExtension),
+      PropertiesContainersList::MakeNewEmptyPropertiesContainersList());
+
+  projectScopedContainers.AddPropertiesContainer(
+      eventsBasedObject.GetPropertyDescriptors());
+  projectScopedContainers.AddParameters(eventsFunction.GetParametersForEvents(
+      eventsBasedObject.GetEventsFunctions()));
+
+  return projectScopedContainers;
+}
+
+ProjectScopedContainers
+ProjectScopedContainers::MakeNewProjectScopedContainersWithLocalVariables(
+    const ProjectScopedContainers &projectScopedContainers,
+    const gd::BaseEvent &event) {
+  ProjectScopedContainers newProjectScopedContainers = projectScopedContainers;
+  newProjectScopedContainers.variablesContainersList =
+      VariablesContainersList::MakeNewVariablesContainersListPushing(
+          projectScopedContainers.GetVariablesContainersList(),
+          event.GetVariables());
+  return newProjectScopedContainers;
+}
+
+} // namespace gd

Core/GDCore/Project/ProjectScopedContainers.h

@@ -13,6 +13,11 @@ class ObjectsContainersList;
 class VariablesContainersList;
 class PropertiesContainersList;
 class NamedPropertyDescriptor;
+class BaseEvent;
+class EventsFunctionsExtension;
+class EventsFunction;
+class EventsBasedBehavior;
+class EventsBasedObject;
 }  // namespace gd
 
 namespace gd {
@@ -51,6 +56,21 @@ class ProjectScopedContainers {
     return projectScopedContainers;
   }
 
+  static ProjectScopedContainers
+  MakeNewProjectScopedContainersForProject(const gd::Project &project) {
+    ProjectScopedContainers projectScopedContainers(
+        ObjectsContainersList::MakeNewObjectsContainersListForProject(
+            project),
+        VariablesContainersList::
+            MakeNewVariablesContainersListForProject(project),
+        PropertiesContainersList::MakeNewEmptyPropertiesContainersList());
+
+    return projectScopedContainers;
+  }
+
+  /**
+   * @deprecated Use another method for an explicit context instead.
+   */
   static ProjectScopedContainers MakeNewProjectScopedContainersFor(
       const gd::ObjectsContainer &globalObjectsContainers,
       const gd::ObjectsContainer &objectsContainers) {
@@ -61,7 +81,40 @@ class ProjectScopedContainers {
         PropertiesContainersList::MakeNewEmptyPropertiesContainersList());
 
     return projectScopedContainers;
-  }
+  };
+
+  static ProjectScopedContainers
+  MakeNewProjectScopedContainersForEventsFunctionsExtension(
+      const gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension);
+
+  static ProjectScopedContainers
+  MakeNewProjectScopedContainersForFreeEventsFunction(
+      const gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      const gd::EventsFunction& eventsFunction,
+      gd::ObjectsContainer& parameterObjectsContainer);
+
+  static ProjectScopedContainers
+  MakeNewProjectScopedContainersForBehaviorEventsFunction(
+      const gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      const gd::EventsBasedBehavior &eventsBasedBehavior,
+      const gd::EventsFunction &eventsFunction,
+      gd::ObjectsContainer &parameterObjectsContainer);
+
+  static ProjectScopedContainers
+  MakeNewProjectScopedContainersForObjectEventsFunction(
+      const gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      const gd::EventsBasedObject &eventsBasedObject,
+      const gd::EventsFunction &eventsFunction,
+      gd::ObjectsContainer &parameterObjectsContainer);
+
+  static ProjectScopedContainers
+  MakeNewProjectScopedContainersWithLocalVariables(
+      const ProjectScopedContainers &projectScopedContainers,
+      const gd::BaseEvent &event);
 
   ProjectScopedContainers &AddPropertiesContainer(
       const gd::PropertiesContainer &container) {
@@ -152,6 +205,14 @@ class ProjectScopedContainers {
     return variablesContainersList;
   };
 
+  /**
+   * @brief Allow modification of the variables containers list. This is used
+   * by code generation which does push and pop of local variable containers.
+   */
+  gd::VariablesContainersList &GetVariablesContainersList() {
+    return variablesContainersList;
+  };
+
   const gd::PropertiesContainersList &GetPropertiesContainersList() const {
     return propertiesContainersList;
   };

Core/GDCore/Project/Variable.cpp

@@ -198,7 +198,24 @@ void Variable::MoveChildInArray(const size_t oldIndex, const size_t newIndex) {
   childrenArray.insert(childrenArray.begin() + newIndex, std::move(object));
 }
 
-Variable& Variable::PushNew() { return GetAtIndex(GetChildrenCount()); };
+Variable& Variable::PushNew() {
+  const size_t count = GetChildrenCount();
+  auto& variable = GetAtIndex(count);
+  if (type == Type::Array && count > 0) {
+    const auto childType = GetAtIndex(count - 1).type;
+    variable.type = childType;
+    if (childType == Type::Number) {
+      variable.SetValue(0);
+    }
+    else if (childType == Type::String) {
+      variable.SetString("");
+    }
+    else if (childType == Type::Boolean) {
+      variable.SetBool(false);
+    }
+  }
+  return variable;
+};
 
 void Variable::RemoveAtIndex(const size_t index) {
   if (index >= childrenArray.size()) return;
@@ -300,6 +317,23 @@ void Variable::UnserializeFrom(const SerializerElement& element) {
 
 Variable& Variable::ResetPersistentUuid() {
   persistentUuid = UUID::MakeUuid4();
+  for (auto& it : children) {
+    it.second->ResetPersistentUuid();
+  }
+  for (auto& it : childrenArray) {
+    it->ResetPersistentUuid();
+  }
+  return *this;
+}
+
+Variable& Variable::ClearPersistentUuid() {
+  persistentUuid = "";
+  for (auto& it : children) {
+    it.second->ClearPersistentUuid();
+  }
+  for (auto& it : childrenArray) {
+    it->ClearPersistentUuid();
+  }
   return *this;
 }
 

Core/GDCore/Project/Variable.h

@@ -30,6 +30,8 @@ class GD_CORE_API Variable {
  public:
   static gd::Variable badVariable;
   enum Type {
+    Unknown,
+    
     // Primitive types
     String,
     Number,
@@ -349,7 +351,7 @@ class GD_CORE_API Variable {
    * \brief Remove the persistent UUID - when the variable no
    * longer needs to be recognized between serializations.
    */
-  Variable& ClearPersistentUuid() { persistentUuid = ""; return *this; };
+  Variable& ClearPersistentUuid();
 
   /**
    * \brief Get the persistent UUID used to recognize

Core/GDCore/Project/VariablesContainer.cpp

@@ -35,7 +35,13 @@ class VariableHasName {
 };
 }  // namespace
 
-VariablesContainer::VariablesContainer() {}
+VariablesContainer::VariablesContainer()
+    : sourceType(VariablesContainer::SourceType::Unknown) {}
+
+VariablesContainer::VariablesContainer(
+    VariablesContainer::SourceType sourceType_) {
+  sourceType = sourceType_;
+}
 
 bool VariablesContainer::Has(const gd::String& name) const {
   auto i =
@@ -229,6 +235,7 @@ VariablesContainer& VariablesContainer::operator=(
 }
 
 void VariablesContainer::Init(const gd::VariablesContainer& other) {
+  sourceType = other.sourceType;
   persistentUuid = other.persistentUuid;
   variables.clear();
   for (auto& it : other.variables) {

Core/GDCore/Project/VariablesContainer.h

@@ -4,8 +4,7 @@
  * reserved. This project is released under the MIT License.
  */
 
-#ifndef GDCORE_VARIABLESCONTAINER_H
-#define GDCORE_VARIABLESCONTAINER_H
+#pragma once
 #include <memory>
 #include <vector>
 #include "GDCore/Project/Variable.h"
@@ -29,12 +28,25 @@ namespace gd {
  */
 class GD_CORE_API VariablesContainer {
  public:
+  enum SourceType {
+      Unknown,
+      Global,
+      Scene,
+      Object,
+      Local,
+      ExtensionGlobal,
+      ExtensionScene
+  };
+
   VariablesContainer();
+  VariablesContainer(const SourceType sourceType);
   VariablesContainer(const VariablesContainer&);
   virtual ~VariablesContainer(){};
 
   VariablesContainer& operator=(const VariablesContainer& rhs);
 
+  SourceType GetSourceType() const { return sourceType; }
+
   /** \name Variables management
    * Members functions related to variables management.
    */
@@ -89,7 +101,6 @@ class GD_CORE_API VariablesContainer {
    */
   const gd::String& GetNameAt(std::size_t index) const;
 
-#if defined(GD_IDE_ONLY)
   /**
    * \brief return the position of the variable called "name" in the variable
    * list
@@ -131,7 +142,6 @@ class GD_CORE_API VariablesContainer {
    * \brief Move the specified variable at a new position in the list.
    */
   void Move(std::size_t oldIndex, std::size_t newIndex);
-#endif
 
   /**
    * \brief Clear all variables of the container.
@@ -178,6 +188,7 @@ class GD_CORE_API VariablesContainer {
   ///@}
 
  private:
+  SourceType sourceType;
   std::vector<std::pair<gd::String, std::shared_ptr<gd::Variable>>> variables;
   mutable gd::String persistentUuid;  ///< A persistent random version 4 UUID,
                                       ///< useful for computing changesets.
@@ -192,5 +203,3 @@ class GD_CORE_API VariablesContainer {
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_VARIABLESCONTAINER_H

Core/GDCore/Project/VariablesContainersList.cpp

@@ -5,20 +5,50 @@
 #include "GDCore/Project/Layout.h"
 #include "GDCore/Project/Project.h"
 #include "GDCore/Project/Variable.h"
+#include "GDCore/Project/EventsFunctionsExtension.h"
 
 namespace gd {
 
 Variable VariablesContainersList::badVariable;
+VariablesContainer VariablesContainersList::badVariablesContainer;
 
 VariablesContainersList
 VariablesContainersList::MakeNewVariablesContainersListForProjectAndLayout(
     const gd::Project& project, const gd::Layout& layout) {
   VariablesContainersList variablesContainersList;
-  variablesContainersList.Add(project.GetVariables());
-  variablesContainersList.Add(layout.GetVariables());
+  variablesContainersList.Push(project.GetVariables());
+  variablesContainersList.Push(layout.GetVariables());
+  variablesContainersList.firstLocalVariableContainerIndex = 2;
   return variablesContainersList;
 }
 
+VariablesContainersList
+VariablesContainersList::MakeNewVariablesContainersListForProject(
+    const gd::Project& project) {
+  VariablesContainersList variablesContainersList;
+  variablesContainersList.Push(project.GetVariables());
+  variablesContainersList.firstLocalVariableContainerIndex = 1;
+  return variablesContainersList;
+}
+
+VariablesContainersList
+VariablesContainersList::MakeNewVariablesContainersListForEventsFunctionsExtension(
+    const gd::EventsFunctionsExtension &extension) {
+  VariablesContainersList variablesContainersList;
+  variablesContainersList.Push(extension.GetGlobalVariables());
+  variablesContainersList.Push(extension.GetSceneVariables());
+  variablesContainersList.firstLocalVariableContainerIndex = 2;
+  return variablesContainersList;
+}
+
+VariablesContainersList
+VariablesContainersList::MakeNewVariablesContainersListPushing(
+    const VariablesContainersList& variablesContainersList, const gd::VariablesContainer& variablesContainer) {
+  VariablesContainersList newVariablesContainersList(variablesContainersList);
+  newVariablesContainersList.Push(variablesContainer);
+  return newVariablesContainersList;
+}
+
 VariablesContainersList
 VariablesContainersList::MakeNewEmptyVariablesContainersList() {
   VariablesContainersList variablesContainersList;
@@ -43,6 +73,37 @@ const Variable& VariablesContainersList::Get(const gd::String& name) const {
   return badVariable;
 }
 
+const VariablesContainer &
+VariablesContainersList::GetVariablesContainerFromVariableName(
+    const gd::String &variableName) const {
+  for (auto it = variablesContainers.rbegin(); it != variablesContainers.rend();
+       ++it) {
+    if ((*it)->Has(variableName))
+      return **it;
+  }
+  return badVariablesContainer;
+}
+
+std::size_t
+VariablesContainersList::GetVariablesContainerPositionFromVariableName(
+    const gd::String &variableName) const {
+  for (std::size_t i = variablesContainers.size() - 1; i >= 0 ; --i) {
+    if (variablesContainers[i]->Has(variableName))
+      return i;
+  }
+  return gd::String::npos;
+}
+
+std::size_t VariablesContainersList::GetLocalVariablesContainerPosition(
+    const gd::VariablesContainer &localVariableContainer) const {
+  for (std::size_t i = firstLocalVariableContainerIndex;
+       i < variablesContainers.size(); ++i) {
+    if (variablesContainers[i] == &localVariableContainer)
+      return i - firstLocalVariableContainerIndex;
+  }
+  return gd::String::npos;
+}
+
 bool VariablesContainersList::HasVariablesContainer(const gd::VariablesContainer& variablesContainer) const {
   for (auto it = variablesContainers.rbegin(); it != variablesContainers.rend();
        ++it) {

Core/GDCore/Project/VariablesContainersList.h

@@ -8,6 +8,7 @@ class Project;
 class Layout;
 class VariablesContainer;
 class Variable;
+class EventsFunctionsExtension;
 }  // namespace gd
 
 namespace gd {
@@ -30,6 +31,20 @@ class GD_CORE_API VariablesContainersList {
   MakeNewVariablesContainersListForProjectAndLayout(const gd::Project& project,
                                                     const gd::Layout& layout);
 
+  static VariablesContainersList
+  MakeNewVariablesContainersListForProject(const gd::Project& project);
+
+  static VariablesContainersList
+  MakeNewVariablesContainersListForEventsFunctionsExtension(
+      const gd::EventsFunctionsExtension &extension);
+
+  static VariablesContainersList MakeNewVariablesContainersListPushing(
+      const VariablesContainersList &variablesContainersList,
+      const gd::VariablesContainer &variablesContainer);
+
+  /**
+   * @deprecated Use another method for an explicit context instead.
+   */
   static VariablesContainersList MakeNewEmptyVariablesContainersList();
 
   /**
@@ -47,6 +62,10 @@ class GD_CORE_API VariablesContainersList {
    */
   bool HasVariablesContainer(const gd::VariablesContainer& variablesContainer) const;
 
+  // TODO: Rename GetTopMostVariablesContainer and GetBottomMostVariablesContainer
+  // to give a clearer access to segments of the container list.
+  // For instance, a project tree segment and an event tree segment.
+
   /**
    * Get the variables container at the top of the scope (so the most "global" one).
    * \brief Avoid using apart when a scope must be forced.
@@ -57,29 +76,76 @@ class GD_CORE_API VariablesContainersList {
   };
 
   /**
-   * Get the variables container at the bottom of the scope (so the most "local" one).
+   * Get the variables container at the bottom of the scope
+   * (so the most "local" one) excluding local variables.
    * \brief Avoid using apart when a scope must be forced.
    */
   const VariablesContainer* GetBottomMostVariablesContainer() const {
     if (variablesContainers.empty()) return nullptr;
-    return variablesContainers.back();
+    return variablesContainers.at(firstLocalVariableContainerIndex - 1);
   }
 
+  /**
+   * Get the variables container for a given variable.
+   */
+  const VariablesContainer &
+  GetVariablesContainerFromVariableName(const gd::String &variableName) const;
+
+  /**
+   * Get the variables container index for a given variable.
+   */
+  std::size_t GetVariablesContainerPositionFromVariableName(
+      const gd::String &variableName) const;
+
+  /**
+   * \brief Get the index of the given local variables container.
+   */
+  std::size_t GetLocalVariablesContainerPosition(
+      const gd::VariablesContainer &localVariableContainer) const;
+
+  /**
+   * \brief Get the variable container at the specified index in the list.
+   *
+   * \warning Trying to access to a not existing variable container will result
+   * in undefined behavior.
+   */
+  const gd::VariablesContainer& GetVariablesContainer(std::size_t index) const {
+    return *variablesContainers.at(index);
+  }
+
+  /**
+   * \brief Return the number variable containers.
+   */
+  std::size_t GetVariablesContainersCount() const { return variablesContainers.size(); }
+
   /**
    * \brief Call the callback for each variable having a name matching the specified search.
    */
   void ForEachVariableMatchingSearch(const gd::String& search, std::function<void(const gd::String& name, const gd::Variable& variable)> fn) const;
 
-  /** Do not use - should be private but accessible to let Emscripten create a temporary. */
-  VariablesContainersList() {};
- private:
-
-  void Add(const gd::VariablesContainer& variablesContainer) {
+  /**
+   * \brief Push a new variables container to the context.
+   */
+  void Push(const gd::VariablesContainer& variablesContainer) {
     variablesContainers.push_back(&variablesContainer);
   };
 
+  /**
+   * \brief Pop a variables container from the context.
+   */
+  void Pop() {
+    variablesContainers.pop_back();
+  };
+
+
+  /** Do not use - should be private but accessible to let Emscripten create a temporary. */
+  VariablesContainersList(): firstLocalVariableContainerIndex(0) {};
+ private:
+
   std::vector<const gd::VariablesContainer*> variablesContainers;
+  std::size_t firstLocalVariableContainerIndex;
   static Variable badVariable;
+  static VariablesContainer badVariablesContainer;
 };
 
 }  // namespace gd

Core/tests/ArbitraryResourceWorker.cpp

@@ -91,7 +91,7 @@ TEST_CASE("ArbitraryResourceWorker", "[common][resources]") {
       sprite.SetImageName("res1");
       anim.SetDirectionsCount(1);
       anim.GetDirection(0).AddSprite(sprite);
-      spriteConfiguration.AddAnimation(anim);
+      spriteConfiguration.GetAnimations().AddAnimation(anim);
 
       gd::Object obj("myObject", "", spriteConfiguration.Clone());
       project.InsertObject(obj, 0);
@@ -138,7 +138,7 @@ TEST_CASE("ArbitraryResourceWorker", "[common][resources]") {
       sprite.SetImageName("res1");
       anim.SetDirectionsCount(1);
       anim.GetDirection(0).AddSprite(sprite);
-      spriteConfiguration.AddAnimation(anim);
+      spriteConfiguration.GetAnimations().AddAnimation(anim);
 
       gd::Object obj("myObject", "", spriteConfiguration.Clone());
       layout.InsertObject(obj, 0);
@@ -437,7 +437,7 @@ TEST_CASE("ArbitraryResourceWorker", "[common][resources]") {
       sprite.SetImageName("res1");
       anim.SetDirectionsCount(1);
       anim.GetDirection(0).AddSprite(sprite);
-      spriteConfiguration.AddAnimation(anim);
+      spriteConfiguration.GetAnimations().AddAnimation(anim);
 
       gd::Object obj("myObject", "", spriteConfiguration.Clone());
       layout.InsertObject(obj, 0);

Core/tests/Common.cpp

@@ -80,7 +80,7 @@ TEST_CASE("EventsList", "[common][events]") {
     #if defined(WINDOWS)
       REQUIRE(3000 >= endMemory - startMemory);
     #else
-      REQUIRE(1500 >= endMemory - startMemory);
+      REQUIRE(1650 >= endMemory - startMemory);
     #endif
   }
 }

Core/tests/DummyPlatform.cpp

@@ -126,6 +126,46 @@ void SetupProjectWithDummyPlatform(gd::Project& project,
       .AddParameter("object", _("Object"), "")
       .SetFunctionName("getFromBaseExpression");
 
+  baseObject.AddAction("SetNumberObjectVariable",
+                  "Do something with number object variables",
+                  "This does something with variables",
+                  "Do something with variables",
+                  "",
+                  "",
+                  "")
+      .AddParameter("object", "Object")
+      .AddParameter("objectvar", "Variable")
+      .AddParameter("operator", "Operator", "number")
+      .AddParameter("number", "Value");
+
+  baseObject.AddAction("SetStringObjectVariable",
+                  "Do something with string object variables",
+                  "This does something with variables",
+                  "Do something with variables",
+                  "",
+                  "",
+                  "")
+      .AddParameter("object", "Object")
+      .AddParameter("objectvar", "Variable")
+      .AddParameter("operator", "Operator", "string")
+      .AddParameter("string", "Value")
+      .SetRelevantForLayoutEventsOnly();
+
+  baseObject.AddAction("SetBooleanObjectVariable",
+                  "Do something with boolean object variables",
+                  "This does something with object variables",
+                  "Do something with object variables",
+                  "",
+                  "",
+                  "")
+      .AddParameter("object", "Object")
+      .AddParameter("objectvar", "Variable")
+      .AddParameter("operator", "Value", "boolean")
+      // This parameter allows to keep the operand expression
+      // when the editor switch between variable instructions.
+      .AddCodeOnlyParameter("yesorno", "Value")
+      .SetRelevantForLayoutEventsOnly();
+
 // Declare default behaviors that are used by event-based objects to avoid
 // warnings.
 {
@@ -204,6 +244,66 @@ void SetupProjectWithDummyPlatform(gd::Project& project,
     .SetHidden();
   platform.AddExtension(extension);
 }
+
+{
+  // Create an extension without namespace to match the switchable variable instructions.
+  std::shared_ptr<gd::PlatformExtension> extension =
+      std::shared_ptr<gd::PlatformExtension>(new gd::PlatformExtension);
+  extension->SetExtensionInformation(
+      "BuiltinVariables", "My testing extension for variables", "", "", "");
+
+  extension
+      ->AddAction("SetNumberVariable",
+                  "Do something with number variables",
+                  "This does something with variables",
+                  "Do something with variables",
+                  "",
+                  "",
+                  "")
+      .AddParameter("variable", "Variable")
+      .AddParameter("operator", "Operator", "number")
+      .AddParameter("number", "Value")
+      .SetFunctionName("setNumberVariable");
+
+  extension
+      ->AddAction("SetStringVariable",
+                  "Do something with string variables",
+                  "This does something with variables",
+                  "Do something with variables",
+                  "",
+                  "",
+                  "")
+      .AddParameter("variable", "Variable")
+      .AddParameter("operator", "Operator", "string")
+      .AddParameter("string", "Value")
+      .SetFunctionName("setStringVariable");
+
+  extension
+      ->AddAction("SetBooleanVariable",
+                  "Do something with boolean variables",
+                  "This does something with variables",
+                  "Do something with variables",
+                  "",
+                  "",
+                  "")
+      .AddParameter("variable", "Variable")
+      .AddParameter("operator", "Operator", "boolean")
+      // This parameter allows to keep the operand expression
+      // when the editor switch between variable instructions.
+      .AddCodeOnlyParameter("trueorfalse", "")
+      .SetFunctionName("setBooleanVariable");
+
+  extension->AddStrExpression("ToString",
+                      "",
+                      "",
+                      "",
+                      "")
+      .AddParameter("number", "")
+      .SetFunctionName("toString");
+
+  platform.AddExtension(extension);
+}
+
   // Create an extension with various stuff inside.
   std::shared_ptr<gd::PlatformExtension> extension =
       std::shared_ptr<gd::PlatformExtension>(new gd::PlatformExtension);

Core/tests/EventsVariablesFinder.cpp

@@ -273,7 +273,7 @@ TEST_CASE("EventsVariablesFinder (FindAllObjectVariables)", "[common]") {
         UseObjectVariable("MyObject", "MyObjectVariable"));
 
     auto variableNames = gd::EventsVariablesFinder::FindAllObjectVariables(
-        platform, project, layout, object);
+        platform, project, layout, "MyObject");
 
     REQUIRE(variableNames.size() == 1);
     REQUIRE(*(variableNames.begin()) == "MyObjectVariable");
@@ -290,7 +290,7 @@ TEST_CASE("EventsVariablesFinder (FindAllObjectVariables)", "[common]") {
         UseObjectVariableInExpression("MyObject", "MyObjectVariable"));
 
     auto variableNames = gd::EventsVariablesFinder::FindAllObjectVariables(
-        platform, project, layout, object);
+        platform, project, layout, "MyObject");
 
     REQUIRE(variableNames.size() == 1);
     REQUIRE(*(variableNames.begin()) == "MyObjectVariable");
@@ -309,7 +309,7 @@ TEST_CASE("EventsVariablesFinder (FindAllObjectVariables)", "[common]") {
     UseExternalEvents(layout, externalEvents);
 
     auto variableNames = gd::EventsVariablesFinder::FindAllObjectVariables(
-        platform, project, layout, object);
+        platform, project, layout, "MyObject");
 
     REQUIRE(variableNames.size() == 1);
     REQUIRE(*(variableNames.begin()) == "MyObjectVariable");
@@ -329,7 +329,7 @@ TEST_CASE("EventsVariablesFinder (FindAllObjectVariables)", "[common]") {
         UseObjectVariable("MyObject2", "MyObjectVariable2"));
 
     auto variableNames = gd::EventsVariablesFinder::FindAllObjectVariables(
-        platform, project, layout, object1);
+        platform, project, layout, "MyObject1");
 
     REQUIRE(variableNames.size() == 1);
     REQUIRE(*(variableNames.begin()) == "MyObjectVariable1");
@@ -352,7 +352,7 @@ TEST_CASE("EventsVariablesFinder (FindAllObjectVariables)", "[common]") {
     UseExternalEvents(layout, externalEvents);
 
     auto variableNames = gd::EventsVariablesFinder::FindAllObjectVariables(
-        platform, project, layout, object1);
+        platform, project, layout, "MyObject1");
 
     REQUIRE(variableNames.size() == 1);
     REQUIRE(*(variableNames.begin()) == "MyObjectVariable1");

Core/tests/ExpressionCodeGenerator.cpp

@@ -30,6 +30,21 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
   layout1.GetVariables().InsertNew("MySceneBooleanVariable").SetBool(true);
   layout1.GetVariables().InsertNew("MySceneStructureVariable").GetChild("MyChild");
   layout1.GetVariables().InsertNew("MySceneStructureVariable2").GetChild("MyChild");
+  layout1.GetVariables().InsertNew("MySceneEmptyArrayVariable").CastTo(gd::Variable::Type::Array);
+  {
+    auto& variable = layout1.GetVariables().InsertNew("MySceneNumberArrayVariable");
+    variable.CastTo(gd::Variable::Type::Array);
+    variable.PushNew().SetValue(1);
+    variable.PushNew().SetValue(2);
+    variable.PushNew().SetValue(3);
+  }
+  {
+    auto& variable = layout1.GetVariables().InsertNew("MySceneStringArrayVariable");
+    variable.CastTo(gd::Variable::Type::Array);
+    variable.PushNew().SetString("1");
+    variable.PushNew().SetString("2");
+    variable.PushNew().SetString("3");
+  }
 
   auto &mySpriteObject = layout1.InsertNewObject(project, "MyExtension::Sprite", "MySpriteObject", 0);
   mySpriteObject.GetVariables().InsertNew("MyNumberVariable").SetValue(123);
@@ -612,7 +627,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneVariable).getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneVariable).getAsNumber() + 1");
     }
     {
       auto node =
@@ -624,7 +639,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneVariable).getAsNumber() + getLayoutVariable(MySceneVariable2).getAsNumber()");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneVariable).getAsNumber() + getAnyVariable(MySceneVariable2).getAsNumber()");
     }
   }
   SECTION("Scene variables (conflict with a global variable)") {
@@ -638,7 +653,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(SceneVariableWithNameReused).getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(SceneVariableWithNameReused).getAsNumber() + 1");
     }
   }
   SECTION("Scene variables (2 levels)") {
@@ -652,7 +667,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(\"MyChild\").getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getAsNumber() + 1");
     }
     {
       auto node =
@@ -664,7 +679,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(\"MyChild\").getAsNumber() + getLayoutVariable(MySceneStructureVariable2).getChild(\"MyChild\").getAsNumber()");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getAsNumber() + getAnyVariable(MySceneStructureVariable2).getChild(\"MyChild\").getAsNumber()");
     }
   }
   SECTION("Scene variables (2 levels with bracket accessor, string)") {
@@ -678,7 +693,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(\"MyChild\").getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getAsNumber() + 1");
     }
     {
       auto node =
@@ -690,7 +705,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(\"MyChild\").getAsNumber() + getLayoutVariable(MySceneStructureVariable2).getChild(\"MyChild\").getAsNumber()");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getAsNumber() + getAnyVariable(MySceneStructureVariable2).getChild(\"MyChild\").getAsNumber()");
     }
   }
   SECTION("Scene variables (2 levels with bracket accessor, number)") {
@@ -704,7 +719,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(3).getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(3).getAsNumber() + 1");
     }
     {
       auto node =
@@ -716,7 +731,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(3).getAsNumber() + getLayoutVariable(MySceneStructureVariable2).getChild(3).getAsNumber()");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(3).getAsNumber() + getAnyVariable(MySceneStructureVariable2).getChild(3).getAsNumber()");
     }
   }
   SECTION("Scene variables (2 levels with bracket accessor, using a number variable as index)") {
@@ -730,7 +745,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(getLayoutVariable(MySceneVariable).getAsNumber()).getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(getAnyVariable(MySceneVariable).getAsNumber()).getAsNumber() + 1");
     }
   }
   SECTION("Scene variables (2 levels with bracket accessor, using a string variable as index)") {
@@ -744,7 +759,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(getLayoutVariable(MySceneStringVariable).getAsString()).getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(getAnyVariable(MySceneStringVariable).getAsString()).getAsNumber() + 1");
     }
   }
   SECTION("Scene variables (2 levels with bracket accessor, using a non string/number variable as index)") {
@@ -758,7 +773,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(getLayoutVariable(MySceneBooleanVariable).getAsNumberOrString()).getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(getAnyVariable(MySceneBooleanVariable).getAsNumberOrString()).getAsNumber() + 1");
     }
   }
   SECTION("Scene variables (2 levels with bracket accessor, using a unknown variable type as index)") {
@@ -772,7 +787,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(getLayoutVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"CantKnownTheTypeSoStayGeneric\").getAsNumberOrString()).getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"CantKnownTheTypeSoStayGeneric\").getAsNumberOrString()).getAsNumber() + 1");
     }
   }
   SECTION("Scene variables (2 levels with bracket accessor, using a unknown variable type and an operator with a number as index)") {
@@ -786,7 +801,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(getLayoutVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"CantKnownTheTypeSoStayGeneric\").getAsNumber() + 2).getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"CantKnownTheTypeSoStayGeneric\").getAsNumber() + 2).getAsNumber() + 1");
     }
   }
   SECTION("Scene variables (2 levels with bracket accessor, using a unknown variable type and an operator with a string as index)") {
@@ -800,7 +815,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(getLayoutVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"CantKnownTheTypeSoStayGeneric\").getAsString() + \"Test\").getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"CantKnownTheTypeSoStayGeneric\").getAsString() + \"Test\").getAsNumber() + 1");
     }
   }
   SECTION("Scene variables (2 levels with bracket accessor, using a unknown variable type as index) (expression type: number|string)") {
@@ -814,7 +829,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(getLayoutVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"CantKnownTheTypeSoStayGeneric\").getAsNumberOrString()).getAsNumberOrString()");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"CantKnownTheTypeSoStayGeneric\").getAsNumberOrString()).getAsNumberOrString()");
     }
   }
   SECTION("Scene variables (2 levels with bracket accessor, using a number variable casted to string as index)") {
@@ -828,7 +843,74 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
 
       REQUIRE(node);
       node->Visit(expressionCodeGenerator);
-      REQUIRE(expressionCodeGenerator.GetOutput() == "getLayoutVariable(MySceneStructureVariable).getChild(\"\" + getLayoutVariable(MySceneVariable).getAsString()).getAsNumber() + 1");
+      REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStructureVariable).getChild(\"\" + getAnyVariable(MySceneVariable).getAsString()).getAsNumber() + 1");
+    }
+  }
+  SECTION("Variable with bracket accessor and operators") {
+    {
+      auto node = parser.ParseExpression(
+          "MySceneStructureVariable[\"MyUndeclaredChild\"] * 2");
+      gd::ExpressionCodeGenerator expressionCodeGenerator(
+          "number", "", codeGenerator, context);
+
+      REQUIRE(node);
+      node->Visit(expressionCodeGenerator);
+      REQUIRE(expressionCodeGenerator.GetOutput() ==
+              "getAnyVariable(MySceneStructureVariable).getChild("
+              "\"MyUndeclaredChild\").getAsNumber() * 2");
+    }
+    {
+      auto node =
+          parser.ParseExpression("MySceneStructureVariable[\"MyUndeclaredChild\"] / 2");
+      gd::ExpressionCodeGenerator expressionCodeGenerator(
+          "number", "", codeGenerator, context);
+
+      REQUIRE(node);
+      node->Visit(expressionCodeGenerator);
+      REQUIRE(expressionCodeGenerator.GetOutput() ==
+              "getAnyVariable(MySceneStructureVariable).getChild("
+              "\"MyUndeclaredChild\").getAsNumber() / 2");
+    }
+    {
+      auto node =
+          parser.ParseExpression("MySceneStructureVariable[\"MyUndeclaredChild\"] - 2");
+      gd::ExpressionCodeGenerator expressionCodeGenerator(
+          "number", "", codeGenerator, context);
+
+      REQUIRE(node);
+      node->Visit(expressionCodeGenerator);
+      REQUIRE(expressionCodeGenerator.GetOutput() ==
+              "getAnyVariable(MySceneStructureVariable).getChild("
+              "\"MyUndeclaredChild\").getAsNumber() - 2");
+    }
+    {
+      auto node = parser.ParseExpression(
+          "MySceneStructureVariable["
+          "MySceneStructureVariable2[\"MyUndeclaredChild\"]] * 2");
+      gd::ExpressionCodeGenerator expressionCodeGenerator(
+          "number", "", codeGenerator, context);
+
+      REQUIRE(node);
+      node->Visit(expressionCodeGenerator);
+      REQUIRE(expressionCodeGenerator.GetOutput() ==
+              "getAnyVariable(MySceneStructureVariable).getChild("
+              "getAnyVariable(MySceneStructureVariable2).getChild("
+              "\"MyUndeclaredChild\").getAsNumberOrString()).getAsNumber() * 2");
+    }
+    {
+      auto node = parser.ParseExpression(
+          "MySceneStructureVariable[\"Child\" + "
+          "ToString(MySceneStructureVariable2[\"MyUndeclaredChild\"] * 2)] * 2");
+      gd::ExpressionCodeGenerator expressionCodeGenerator(
+          "number", "", codeGenerator, context);
+
+      REQUIRE(node);
+      node->Visit(expressionCodeGenerator);
+      REQUIRE(expressionCodeGenerator.GetOutput() ==
+              "getAnyVariable(MySceneStructureVariable).getChild("
+              "\"Child\" + "
+              "toString(getAnyVariable(MySceneStructureVariable2).getChild("
+              "\"MyUndeclaredChild\").getAsNumber() * 2)).getAsNumber() * 2");
     }
   }
   SECTION("Object variable with non existing object (invalid)") {
@@ -1008,80 +1090,83 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
               "fakeBadVariable");
     }
   }
-  SECTION("Valid variables (upcoming, new 'variable' type working for any variable)") {
-    // When implemented, copy the test cases from the next section, like this:
-    // SECTION("simple variable") {
-    //   REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-    //               codeGenerator, context, "variable", "MySceneVariable", "")
-    //           == "getLayoutVariable(MySceneVariable)");
-    // }
-    // SECTION("simple (global) variable") {
-    //   REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-    //               codeGenerator, context, "variable", "MyGlobalNumberVariable", "")
-    //           == "getProjectVariable(MyGlobalNumberVariable)");
-    // }
-  }
   SECTION("Valid variables (legacy, pre-scoped variables)") {
+    // Check that the scope is forwarded by the parser.
     SECTION("simple variable") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable", "")
-              == "getLayoutVariable(myVariable)");
+                  codeGenerator, context, "scenevar", "MySceneVariable", "")
+              == "getLayoutVariable(MySceneVariable)");
+    }
+    SECTION("simple (global) variable") {
+      REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
+                  codeGenerator, context, "globalvar", "MyGlobalNumberVariable", "")
+              == "getProjectVariable(MyGlobalNumberVariable)");
+    }
+  }
+  SECTION("Valid variables") {
+    // getAnyVariable is a mocked value. The function doesn't actually exist.
+    // The actual scope switching is done by GDJS and tested by GDevelop.js
+    // integration tests.
+    SECTION("simple variable") {
+      REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
+                  codeGenerator, context, "variable", "MySceneVariable", "")
+              == "getAnyVariable(MySceneVariable)");
     }
     SECTION("child dot accessor") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable.myChild", "")
-              == "getLayoutVariable(myVariable).getChild(\"myChild\")");
+                  codeGenerator, context, "variable", "MySceneVariable.myChild", "")
+              == "getAnyVariable(MySceneVariable).getChild(\"myChild\")");
     }
     SECTION("2 children") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable.child1.child2", "")
-              == "getLayoutVariable(myVariable).getChild(\"child1\").getChild(\"child2\")");
+                  codeGenerator, context, "variable", "MySceneVariable.child1.child2", "")
+              == "getAnyVariable(MySceneVariable).getChild(\"child1\").getChild(\"child2\")");
     }
     SECTION("bracket access") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable[ \"hello\" + "
+                  codeGenerator, context, "variable", "MySceneVariable[ \"hello\" + "
             "\"world\" ]", "")
-              == "getLayoutVariable(myVariable).getChild(\"hello\" + \"world\")");
+              == "getAnyVariable(MySceneVariable).getChild(\"hello\" + \"world\")");
     }
     SECTION("bracket access (using a string object variable inside)") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable[MySpriteObject.MyStringVariable]", "")
-              == "getLayoutVariable(myVariable).getChild(getVariableForObject(MySpriteObject, MyStringVariable).getAsString())");
+                  codeGenerator, context, "variable", "MySceneVariable[MySpriteObject.MyStringVariable]", "")
+              == "getAnyVariable(MySceneVariable).getChild(getVariableForObject(MySpriteObject, MyStringVariable).getAsString())");
     }
     SECTION("bracket access (using a number object variable inside)") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable[MySpriteObject.MyNumberVariable]", "")
-              == "getLayoutVariable(myVariable).getChild(getVariableForObject(MySpriteObject, MyNumberVariable).getAsNumber())");
+                  codeGenerator, context, "variable", "MySceneVariable[MySpriteObject.MyNumberVariable]", "")
+              == "getAnyVariable(MySceneVariable).getChild(getVariableForObject(MySpriteObject, MyNumberVariable).getAsNumber())");
     }
     SECTION("bracket access (using a string variable inside)") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable[MySceneStringVariable]", "")
-              == "getLayoutVariable(myVariable).getChild(getLayoutVariable(MySceneStringVariable).getAsString())");
+                  codeGenerator, context, "variable", "MySceneVariable[MySceneStringVariable]", "")
+              == "getAnyVariable(MySceneVariable).getChild(getAnyVariable(MySceneStringVariable).getAsString())");
     }
     SECTION("bracket access (using a number variable inside)") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable[MySceneVariable]", "")
-              == "getLayoutVariable(myVariable).getChild(getLayoutVariable(MySceneVariable).getAsNumber())");
+                  codeGenerator, context, "variable", "MySceneVariable[MySceneVariable]", "")
+              == "getAnyVariable(MySceneVariable).getChild(getAnyVariable(MySceneVariable).getAsNumber())");
     }
     SECTION("bracket access (using a string global variable inside)") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable[MyGlobalStringVariable]", "")
-              == "getLayoutVariable(myVariable).getChild(getProjectVariable(MyGlobalStringVariable).getAsString())");
+                  codeGenerator, context, "variable", "MySceneVariable[MyGlobalStringVariable]", "")
+              == "getAnyVariable(MySceneVariable).getChild(getAnyVariable(MyGlobalStringVariable).getAsString())");
     }
     SECTION("bracket access (using a number global variable inside)") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable[MyGlobalNumberVariable]", "")
-              == "getLayoutVariable(myVariable).getChild(getProjectVariable(MyGlobalNumberVariable).getAsNumber())");
+                  codeGenerator, context, "variable", "MySceneVariable[MyGlobalNumberVariable]", "")
+              == "getAnyVariable(MySceneVariable).getChild(getAnyVariable(MyGlobalNumberVariable).getAsNumber())");
     }
     SECTION("bracket access (using a boolean variable inside)") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable[MySceneBooleanVariable]", "")
-              == "getLayoutVariable(myVariable).getChild(getLayoutVariable(MySceneBooleanVariable).getAsNumberOrString())");
+                  codeGenerator, context, "variable", "MySceneVariable[MySceneBooleanVariable]", "")
+              == "getAnyVariable(MySceneVariable).getChild(getAnyVariable(MySceneBooleanVariable).getAsNumberOrString())");
     }
     SECTION("bracket access (using a structure variable inside)") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
-                  codeGenerator, context, "scenevar", "myVariable[MySceneStructureVariable.MyChild.SubChild]", "")
-              == "getLayoutVariable(myVariable).getChild(getLayoutVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"SubChild\").getAsNumberOrString())");
+                  codeGenerator, context, "variable", "MySceneVariable[MySceneStructureVariable.MyChild.SubChild]", "")
+              == "getAnyVariable(MySceneVariable).getChild(getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"SubChild\").getAsNumberOrString())");
     }
     SECTION("object variable") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
@@ -1091,7 +1176,7 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
     SECTION("object variable with bracket access (using a structure variable inside)") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
                   codeGenerator, context, "objectvar", "myVariable[MySceneStringVariable]", "MySpriteObject")
-              == "getVariableForObject(MySpriteObject, myVariable).getChild(getLayoutVariable(MySceneStringVariable).getAsString())");
+              == "getVariableForObject(MySpriteObject, myVariable).getChild(getAnyVariable(MySceneStringVariable).getAsString())");
     }
     SECTION("object variable with bracket access (using an object variable inside)") {
       REQUIRE(gd::ExpressionCodeGenerator::GenerateExpressionCode(
@@ -1295,6 +1380,221 @@ TEST_CASE("ExpressionCodeGenerator", "[common][events]") {
       REQUIRE(output == "getVariableForObject(MySpriteObject, MyOtherSpriteObject).getChild(\"Child\").getChild(\"Grandchild\")");
     }
   }
+  SECTION("Type conversions (valid operators with variables having different types than the expression)") {
+    SECTION("Expression/parent type is 'string'") {
+      {
+        auto node =
+          parser.ParseExpression("\"You have \" + MySceneVariable + \" points\"");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("string",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "\"You have \" + getAnyVariable(MySceneVariable).getAsString() + \" points\"");
+      }
+      {
+        auto node =
+          parser.ParseExpression("MySceneVariable + MySceneStringVariable");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("string",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneVariable).getAsString() + getAnyVariable(MySceneStringVariable).getAsString()");
+      }
+    }
+    SECTION("Expression/parent type is 'string' (with an unknown variable)") {
+      {
+        auto node =
+          parser.ParseExpression("\"You have \" + MySceneStructureVariable.MyChild.CantKnownTheTypeSoStayGeneric + \" points\"");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("string",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "\"You have \" + getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"CantKnownTheTypeSoStayGeneric\").getAsString() + \" points\"");
+      }
+    }
+    SECTION("Expression/parent type is 'string' (2 number variables)") {
+      {
+        auto node =
+          parser.ParseExpression("MySceneVariable + MySceneVariable2 + \"world\"");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("string",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneVariable).getAsString() + getAnyVariable(MySceneVariable2).getAsString() + \"world\"");
+      }
+      {
+        auto node =
+          parser.ParseExpression("MySceneVariable + MySceneVariable2 + MySceneStringVariable");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("string",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneVariable).getAsString() + getAnyVariable(MySceneVariable2).getAsString() + getAnyVariable(MySceneStringVariable).getAsString()");
+      }
+    }
+    SECTION("Expression/parent type is 'string' (array variable)") {
+      {
+        auto node =
+          parser.ParseExpression("\"hello\" + MySceneNumberArrayVariable[2] + \"world\"");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("string",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "\"hello\" + getAnyVariable(MySceneNumberArrayVariable).getChild(2).getAsString() + \"world\"");
+      }
+      {
+        auto node =
+          parser.ParseExpression("\"hello\" + MySceneEmptyArrayVariable[2] + \"world\"");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("string",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "\"hello\" + getAnyVariable(MySceneEmptyArrayVariable).getChild(2).getAsString() + \"world\"");
+      }
+    }
+
+    SECTION("Expression/parent type is 'number'") {
+      {
+        auto node =
+          parser.ParseExpression("123 + MySceneVariable + 456");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("number",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "123 + getAnyVariable(MySceneVariable).getAsNumber() + 456");
+      }
+      {
+        auto node =
+          parser.ParseExpression("MySceneStringVariable + MySceneVariable");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("number",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStringVariable).getAsNumber() + getAnyVariable(MySceneVariable).getAsNumber()");
+      }
+    }
+    SECTION("Expression/parent type is 'string' (with an unknown variable)") {
+      {
+        auto node =
+          parser.ParseExpression("123 + MySceneStructureVariable.MyChild.CantKnownTheTypeSoStayGeneric + 456");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("number",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "123 + getAnyVariable(MySceneStructureVariable).getChild(\"MyChild\").getChild(\"CantKnownTheTypeSoStayGeneric\").getAsNumber() + 456");
+      }
+    }
+    SECTION("Expression/parent type is 'number' (2 string variables)") {
+      {
+        auto node =
+          parser.ParseExpression("MySceneStringVariable + MySceneStringVariable + 456");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("number",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStringVariable).getAsNumber() + getAnyVariable(MySceneStringVariable).getAsNumber() + 456");
+      }
+      {
+        auto node =
+          parser.ParseExpression("MySceneStringVariable + MySceneStringVariable + MySceneVariable");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("number",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "getAnyVariable(MySceneStringVariable).getAsNumber() + getAnyVariable(MySceneStringVariable).getAsNumber() + getAnyVariable(MySceneVariable).getAsNumber()");
+      }
+    }
+    SECTION("Expression/parent type is 'number' (array variable)") {
+      {
+        auto node =
+          parser.ParseExpression("123 + MySceneNumberArrayVariable[2] + 456");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("number",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "123 + getAnyVariable(MySceneNumberArrayVariable).getChild(2).getAsNumber() + 456");
+      }
+      {
+        auto node =
+          parser.ParseExpression("123 + MySceneEmptyArrayVariable[2] + 456");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("number",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "123 + getAnyVariable(MySceneEmptyArrayVariable).getChild(2).getAsNumber() + 456");
+      }
+    }
+
+
+    SECTION("Multiple type conversions in sub expressions or same expression") {
+      {
+        auto node =
+          parser.ParseExpression("\"hello\" + MySceneNumberArrayVariable[2 + MySceneStringVariable] + \"world\" + MySceneVariable + \"world 2\"");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("string",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "\"hello\" + getAnyVariable(MySceneNumberArrayVariable).getChild(2 + getAnyVariable(MySceneStringVariable).getAsNumber()).getAsString() + \"world\" + getAnyVariable(MySceneVariable).getAsString() + \"world 2\"");
+      }
+      {
+        auto node =
+          parser.ParseExpression("\"hello\" + MySceneNumberArrayVariable[\"foo\" + MySceneVariable + \"bar\"] + \"world\" + MySceneVariable + \"world 2\"");
+        gd::ExpressionCodeGenerator expressionCodeGenerator("string",
+                                                            "",
+                                                            codeGenerator,
+                                                            context);
+
+        REQUIRE(node);
+        node->Visit(expressionCodeGenerator);
+        REQUIRE(expressionCodeGenerator.GetOutput() == "\"hello\" + getAnyVariable(MySceneNumberArrayVariable).getChild(\"foo\" + getAnyVariable(MySceneVariable).getAsString() + \"bar\").getAsString() + \"world\" + getAnyVariable(MySceneVariable).getAsString() + \"world 2\"");
+      }
+    }
+  }
   SECTION("Mixed test (1)") {
     {
       auto node = parser.ParseExpression("-+-MyExtension::MouseX(,)");

Core/tests/ExpressionCompletionFinder.cpp

@@ -55,8 +55,8 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Object or expression completions when type is string") {
       // clang-format off
       std::vector<gd::String> expectedCompletions{
-          "{ 0, string, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
-          "{ 3, no type, 1, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
+          "{ 0, string, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
+          "{ 3, no type, 2, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
           gd::ExpressionCompletionDescription::ForExpressionWithPrefix("string", "My", 0, 2).ToString()
       };
       // clang-format on
@@ -67,8 +67,8 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Object or expression completions when type is number") {
       // clang-format off
       std::vector<gd::String> expectedCompletions{
-          "{ 0, number, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
-          "{ 3, no type, 1, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
+          "{ 0, number, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
+          "{ 3, no type, 2, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
           gd::ExpressionCompletionDescription::ForExpressionWithPrefix("number", "My", 0, 2).ToString()
       };
       // clang-format on
@@ -79,8 +79,8 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Object or expression completions when type is number|string") {
       // clang-format off
       std::vector<gd::String> expectedCompletions{
-          "{ 0, number|string, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
-          "{ 3, no type, 1, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
+          "{ 0, number|string, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
+          "{ 3, no type, 2, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
           gd::ExpressionCompletionDescription::ForExpressionWithPrefix("number|string", "My", 0, 2).ToString()
       };
       // clang-format on
@@ -94,8 +94,8 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Object or expression completions in a variable name") {
       // clang-format off
       std::vector<gd::String> expectedCompletions{
-          "{ 0, string, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
-          "{ 3, no type, 1, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
+          "{ 0, string, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
+          "{ 3, no type, 2, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
           gd::ExpressionCompletionDescription::ForExpressionWithPrefix("string", "My", 0, 2).ToString()
       };
       // clang-format on
@@ -115,8 +115,8 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Object or expression completions in a variable index") {
       // clang-format off
       std::vector<gd::String> expectedCompletions{
-          "{ 0, number, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
-          "{ 3, no type, 1, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
+          "{ 0, number, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
+          "{ 3, no type, 2, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
           gd::ExpressionCompletionDescription::ForExpressionWithPrefix("number", "My", 0, 2).ToString()
       };
       // clang-format on
@@ -136,7 +136,7 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Object when type is an object") {
       // clang-format off
       std::vector<gd::String> expectedCompletions{
-          "{ 0, object, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
+          "{ 0, object, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
       };
       // clang-format on
       REQUIRE(getCompletionsFor("object", "My", 0) == expectedCompletions);
@@ -149,7 +149,7 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
       // result in different code generation):
       // clang-format off
       std::vector<gd::String> expectedCompletions{
-          "{ 0, objectPtr, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
+          "{ 0, objectPtr, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
       };
       // clang-format on
       REQUIRE(getCompletionsFor("objectPtr", "My", 0) == expectedCompletions);
@@ -204,8 +204,8 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
 
       // clang-format off
       std::vector<gd::String> expectedCompletions{
-          "{ 0, unknown, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
-          "{ 3, no type, 1, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
+          "{ 0, unknown, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }",
+          "{ 3, no type, 2, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
           gd::ExpressionCompletionDescription::ForExpressionWithPrefix("unknown", "My", 9, 10).ToString()
       };
       // clang-format on
@@ -215,7 +215,7 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Function with a Variable as argument") {
       // clang-format off
       std::vector<gd::String> expectedCompletions{
-          "{ 3, no type, 1, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
+          "{ 3, no type, 2, no prefix, myVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
       };
       // clang-format on
       REQUIRE(getCompletionsFor("number",
@@ -225,7 +225,7 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Object function with a Variable as argument") {
       // clang-format off
       std::vector<gd::String> expectedCompletions{
-          "{ 3, no type, 1, no prefix, myObjectVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
+          "{ 3, no type, 2, no prefix, myObjectVariable, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, no object configuration }",
       };
       // clang-format on
       REQUIRE(getCompletionsFor("number",
@@ -254,7 +254,7 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Test with string type") {
       // clang-format off
       std::vector<gd::String> expectedObjectCompletions{
-          "{ 0, string, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
+          "{ 0, string, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
       };
       std::vector<gd::String> expectedBehaviorOrFunctionCompletions{
           gd::ExpressionCompletionDescription::ForBehaviorWithPrefix("Func", 9, 13, "MyObject").ToString(),
@@ -277,7 +277,7 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Test with 'number|string' type") {
       // clang-format off
       std::vector<gd::String> expectedObjectCompletions{
-          "{ 0, number|string, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
+          "{ 0, number|string, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
       };
       std::vector<gd::String> expectedBehaviorOrFunctionCompletions{
           gd::ExpressionCompletionDescription::ForBehaviorWithPrefix("Func", 9, 13, "MyObject").ToString(),
@@ -303,7 +303,7 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Test 1") {
       // clang-format off
       std::vector<gd::String> expectedObjectCompletions{
-          "{ 0, string, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
+          "{ 0, string, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
       };
       std::vector<gd::String> expectedBehaviorOrFunctionCompletions{
           gd::ExpressionCompletionDescription::ForBehaviorWithPrefix("Func", 9, 13, "MyObject").ToString(),
@@ -336,7 +336,7 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Test 1") {
       // clang-format off
       std::vector<gd::String> expectedObjectCompletions{
-          "{ 0, string, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
+          "{ 0, string, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
       };
       std::vector<gd::String> expectedBehaviorCompletions{
           gd::ExpressionCompletionDescription::ForBehaviorWithPrefix("MyBehavior", 9, 19, "MyObject").ToString()};
@@ -366,7 +366,7 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Test 2") {
       // clang-format off
       std::vector<gd::String> expectedObjectCompletions{
-          "{ 0, string, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
+          "{ 0, string, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
       };
       std::vector<gd::String> expectedBehaviorCompletions{
           gd::ExpressionCompletionDescription::ForBehaviorWithPrefix("MyBehavior", 9, 19, "MyObject").ToString()
@@ -396,7 +396,7 @@ TEST_CASE("ExpressionCompletionFinder", "[common][events]") {
     SECTION("Test 1") {
       // clang-format off
       std::vector<gd::String> expectedObjectCompletions{
-          "{ 0, string, 1, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
+          "{ 0, string, 2, no prefix, MyObject, no object name, no behavior name, non-exact, not last parameter, no parameter metadata, with object configuration }"
       };
       std::vector<gd::String> expectedBehaviorCompletions{
           gd::ExpressionCompletionDescription::ForBehaviorWithPrefix("MyBehavior", 9, 19, "MyObject").ToString()

Core/tests/ExpressionParser2.cpp

@@ -11,7 +11,7 @@
 #include "GDCore/IDE/Events/ExpressionValidator.h"
 #include "GDCore/IDE/Events/ExpressionTypeFinder.h"
 #include "GDCore/IDE/Events/ExpressionVariableOwnerFinder.h"
-#include "GDCore/IDE/Events/ExpressionVariableParentFinder.h"
+#include "GDCore/IDE/Events/ExpressionVariablePathFinder.h"
 #include "GDCore/Project/Layout.h"
 #include "GDCore/Project/Project.h"
 #include "GDCore/Project/ProjectScopedContainers.h"
@@ -22,6 +22,8 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
   gd::Project project;
   gd::Platform platform;
   SetupProjectWithDummyPlatform(project, platform);
+  project.GetVariables().InsertNew("MyProjectVariable");
+
   auto &layout1 = project.InsertNewLayout("Layout1", 0);
   layout1.GetVariables().InsertNew("MySceneVariable");
   layout1.GetVariables().InsertNew("MySceneVariable2");
@@ -204,7 +206,7 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
       REQUIRE(node != nullptr);
 
       // Also check that if we try to find the last parent of node, it is not defined.
-      auto lastParentOfNode = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfNode = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, *node);
       REQUIRE(lastParentOfNode.parentVariable == nullptr);
       REQUIRE(lastParentOfNode.parentVariablesContainer == nullptr);
@@ -232,7 +234,7 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
       REQUIRE(node != nullptr);
 
       // Also check that if we try to find the last parent of node, it is not defined.
-      auto lastParentOfNode = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfNode = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, *node);
       REQUIRE(lastParentOfNode.parentVariable == nullptr);
       REQUIRE(lastParentOfNode.parentVariablesContainer == nullptr);
@@ -786,7 +788,7 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
       REQUIRE(node != nullptr);
 
       // Also check that if we try to find the last parent of node, it is not defined.
-      auto lastParentOfNode = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfNode = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, *node);
       REQUIRE(lastParentOfNode.parentVariable == nullptr);
       REQUIRE(lastParentOfNode.parentVariablesContainer == nullptr);
@@ -1519,13 +1521,61 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
     }
   }
 
+  SECTION("Variable with bracket accessor and operators") {
+    {
+      auto node =
+          parser.ParseExpression("MySceneStructureVariable[\"MyUndeclaredChild\"] * 2");
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "number");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+    {
+      auto node =
+          parser.ParseExpression("MySceneStructureVariable[\"MyUndeclaredChild\"] / 2");
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "number");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+    {
+      auto node =
+          parser.ParseExpression("MySceneStructureVariable[\"MyUndeclaredChild\"] - 2");
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "number");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+    {
+      auto node = parser.ParseExpression(
+          "MySceneStructureVariable["
+          "MySceneStructureVariable2[\"MyUndeclaredChild\"]] * 2");
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers,
+                                        "number");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+    {
+      // TODO `ToString` should not be required here.
+      auto node = parser.ParseExpression(
+          "MySceneStructureVariable[\"Child\" + "
+          "ToString(MySceneStructureVariable2[\"MyUndeclaredChild\"] * 2)] * 2");
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers,
+                                        "number");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+  }
+
   SECTION("Invalid scene variables (1 level, variable does not exist)") {
     {
       auto node =
           parser.ParseExpression("MyNonExistingSceneVariable");
 
       // Also check that if we try to find the last parent of node, it is not defined.
-      auto lastParentOfNode = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfNode = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, *node);
       REQUIRE(lastParentOfNode.parentVariable == nullptr);
       REQUIRE(lastParentOfNode.parentVariablesContainer == nullptr);
@@ -1557,7 +1607,7 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
           parser.ParseExpression("MyNonExistingSceneVariable.MyNonExistingChild");
 
       // Also check that if we try to find the last parent of node, it is not defined.
-      auto lastParentOfNode = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfNode = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, *node);
       REQUIRE(lastParentOfNode.parentVariable == nullptr);
       REQUIRE(lastParentOfNode.parentVariablesContainer == nullptr);
@@ -1641,7 +1691,7 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
           parser.ParseExpression("MyNonExistingSpriteObject.MyVariable");
 
       // Also check that if we try to find the last parent of node, it is not defined.
-      auto lastParentOfNode = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfNode = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, *node);
       REQUIRE(lastParentOfNode.parentVariable == nullptr);
       REQUIRE(lastParentOfNode.parentVariablesContainer == nullptr);
@@ -2711,6 +2761,130 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
               "You entered a text, but this type was expected: variable");
     }
   }
+  
+  SECTION("Variable declaration") {
+    SECTION("Undeclared variable") {
+      auto node = parser.ParseExpression("MyUndeclaredVariable");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "variable");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 1);
+      REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+              "No variable with this name found.");
+    }
+
+    SECTION("Undeclared variable with children") {
+      auto node = parser.ParseExpression("MyUndeclaredVariable.MyChild.MyChild");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "variable");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 1);
+      REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+              "No variable with this name found.");
+    }
+
+    SECTION("Variable name collision with an object") {
+      auto node = parser.ParseExpression("MySpriteObject");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers,
+                                        "variable");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+      REQUIRE(validator.GetAllErrors().size() == 1);
+      REQUIRE(validator.GetAllErrors()[0]->GetMessage() ==
+              "This variable has the same name as an object. Consider renaming "
+              "one or the other.");
+    }
+
+    SECTION("Variable name collision with an object (with child-variables)") {
+      auto node = parser.ParseExpression("MySpriteObject.MyChild.MyChild");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "variable");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+      REQUIRE(validator.GetAllErrors().size() == 1);
+      REQUIRE(validator.GetAllErrors()[0]->GetMessage() ==
+              "This variable has the same name as an object. Consider renaming "
+              "one or the other.");
+    }
+
+    SECTION("Declared scene variable") {
+      auto node = parser.ParseExpression("MySceneVariable");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "variable");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+
+    SECTION("Declared scene variable with children") {
+      // Children themselves don't need to be declared.
+      auto node = parser.ParseExpression("MySceneVariable.MyChild.MyChild");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "variable");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+
+    SECTION("Declared project variable") {
+      auto node = parser.ParseExpression("MyProjectVariable");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "variable");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+
+    SECTION("Declared project variable with children") {
+      auto node = parser.ParseExpression("MyProjectVariable.MyChild.MyChild");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "variable");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+
+    SECTION("Undeclared legacy pre-scope scene variable") {
+      auto node = parser.ParseExpression("MyUndeclaredVariable");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "scenevar");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+
+    SECTION("Undeclared legacy pre-scope scene variable with children") {
+      auto node = parser.ParseExpression("MyUndeclaredVariable.MyChild.MyChild");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "scenevar");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+
+    SECTION("Undeclared legacy pre-scope project variable") {
+      auto node = parser.ParseExpression("MyUndeclaredVariable");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "globalvar");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+
+    SECTION("Undeclared legacy pre-scope project variable with children") {
+      auto node = parser.ParseExpression("MyUndeclaredVariable.MyChild.MyChild");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "globalvar");
+      node->Visit(validator);
+      REQUIRE(validator.GetFatalErrors().size() == 0);
+    }
+  }
 
   SECTION("Valid variables") {
     SECTION("simple variable") {
@@ -2954,6 +3128,238 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
     }
   }
 
+  SECTION("Valid operators with variables having different types than the expression") {
+    SECTION("Expression/parent type is 'string'") {
+      // A trivial test (everything is a string).
+      {
+        auto node = parser.ParseExpression("\"You have \" + MySceneStringVariable + \" points\"");
+        REQUIRE(node != nullptr);
+
+        gd::ExpressionValidator validator(platform, projectScopedContainers, "string");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 0);
+      }
+      // A string concatenated with a number variable (will have to be casted to a string in code generation)
+      {
+        auto node = parser.ParseExpression("\"You have \" + MySceneNumberVariable");
+        REQUIRE(node != nullptr);
+
+        gd::ExpressionValidator validator(platform, projectScopedContainers, "string");
+        node->Visit(validator);
+
+        REQUIRE(validator.GetFatalErrors().size() == 0);
+      }
+      // A string concatenated with a number variable (will have to be casted to a string in code generation)
+      // and then with a string again.
+      {
+        auto node = parser.ParseExpression("\"You have \" + MySceneNumberVariable + \" points\"");
+        REQUIRE(node != nullptr);
+
+        gd::ExpressionValidator validator(platform, projectScopedContainers, "string");
+        node->Visit(validator);
+
+        REQUIRE(validator.GetFatalErrors().size() == 0);
+      }
+      // A string concatenated with an unknown variable (will have to be casted to a string in code generation)
+      // and then with a string again.
+      {
+        auto node = parser.ParseExpression("\"You have \" + MySceneStructureVariable.MyChild.CantKnownTheTypeSoStayGeneric + \" points\"");
+        REQUIRE(node != nullptr);
+
+        gd::ExpressionValidator validator(platform, projectScopedContainers, "string");
+        node->Visit(validator);
+
+        REQUIRE(validator.GetFatalErrors().size() == 0);
+      }
+    }
+    SECTION("Expression/parent type is 'number'") {
+      // A trivial test (everything is a string).
+      {
+        auto node = parser.ParseExpression("123 + MySceneNumberVariable + 456");
+        REQUIRE(node != nullptr);
+
+        gd::ExpressionValidator validator(platform, projectScopedContainers, "number");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 0);
+      }
+      // A number concatenated with a string variable (will have to be casted to a number in code generation)
+      {
+        auto node = parser.ParseExpression("123 + MySceneStringVariable");
+        REQUIRE(node != nullptr);
+
+        gd::ExpressionValidator validator(platform, projectScopedContainers, "number");
+        node->Visit(validator);
+
+        REQUIRE(validator.GetFatalErrors().size() == 0);
+      }
+      // A number concatenated with a string variable (will have to be casted to a number in code generation)
+      // and then with a number again.
+      {
+        auto node = parser.ParseExpression("123 + MySceneStringVariable + 456");
+        REQUIRE(node != nullptr);
+
+        gd::ExpressionValidator validator(platform, projectScopedContainers, "number");
+        node->Visit(validator);
+
+        REQUIRE(validator.GetFatalErrors().size() == 0);
+      }
+      // A number concatenated with an unknown variable (will have to be casted to a number in code generation)
+      // and then with a number again.
+      {
+        auto node = parser.ParseExpression("123 + MySceneStructureVariable.MyChild.CantKnownTheTypeSoStayGeneric + 456");
+        REQUIRE(node != nullptr);
+
+        gd::ExpressionValidator validator(platform, projectScopedContainers, "number");
+        node->Visit(validator);
+
+        REQUIRE(validator.GetFatalErrors().size() == 0);
+      }
+    }
+    SECTION("Expression/parent type is 'number|string'") {
+      SECTION("Expression/parent inferred type is 'string'") {
+        // A trivial test (everything is a string).
+        {
+          auto node = parser.ParseExpression("\"You have \" + MySceneStringVariable + \" points\"");
+          REQUIRE(node != nullptr);
+
+          gd::ExpressionValidator validator(platform, projectScopedContainers, "number|string");
+          node->Visit(validator);
+          REQUIRE(validator.GetFatalErrors().size() == 0);
+        }
+        // A string concatenated with a number variable (will have to be casted to a string in code generation)
+        {
+          auto node = parser.ParseExpression("\"You have \" + MySceneNumberVariable");
+          REQUIRE(node != nullptr);
+
+          gd::ExpressionValidator validator(platform, projectScopedContainers, "number|string");
+          node->Visit(validator);
+
+          REQUIRE(validator.GetFatalErrors().size() == 0);
+        }
+        // A string concatenated with a number variable (will have to be casted to a string in code generation)
+        // and then with a string again.
+        {
+          auto node = parser.ParseExpression("\"You have \" + MySceneNumberVariable + \" points\"");
+          REQUIRE(node != nullptr);
+
+          gd::ExpressionValidator validator(platform, projectScopedContainers, "number|string");
+          node->Visit(validator);
+
+          REQUIRE(validator.GetFatalErrors().size() == 0);
+        }
+        // A string concatenated with an unknown variable (will have to be casted to a string in code generation)
+        // and then with a string again.
+        {
+          auto node = parser.ParseExpression("\"You have \" + MySceneStructureVariable.MyChild.CantKnownTheTypeSoStayGeneric + \" points\"");
+          REQUIRE(node != nullptr);
+
+          gd::ExpressionValidator validator(platform, projectScopedContainers, "number|string");
+          node->Visit(validator);
+
+          REQUIRE(validator.GetFatalErrors().size() == 0);
+        }
+      }
+      SECTION("Expression/parent inferred type is 'number'") {
+        // A trivial test (everything is a string).
+        {
+          auto node = parser.ParseExpression("123 + MySceneNumberVariable + 456");
+          REQUIRE(node != nullptr);
+
+          gd::ExpressionValidator validator(platform, projectScopedContainers, "number|string");
+          node->Visit(validator);
+          REQUIRE(validator.GetFatalErrors().size() == 0);
+        }
+        // A number concatenated with a string variable (will have to be casted to a number in code generation)
+        {
+          auto node = parser.ParseExpression("123 + MySceneStringVariable");
+          REQUIRE(node != nullptr);
+
+          gd::ExpressionValidator validator(platform, projectScopedContainers, "number|string");
+          node->Visit(validator);
+
+          REQUIRE(validator.GetFatalErrors().size() == 0);
+        }
+        // A number concatenated with a string variable (will have to be casted to a number in code generation)
+        // and then with a number again.
+        {
+          auto node = parser.ParseExpression("123 + MySceneStringVariable + 456");
+          REQUIRE(node != nullptr);
+
+          gd::ExpressionValidator validator(platform, projectScopedContainers, "number|string");
+          node->Visit(validator);
+
+          REQUIRE(validator.GetFatalErrors().size() == 0);
+        }
+        // A number concatenated with an unknown variable (will have to be casted to a number in code generation)
+        // and then with a number again.
+        {
+          auto node = parser.ParseExpression("123 + MySceneStructureVariable.MyChild.CantKnownTheTypeSoStayGeneric + 456");
+          REQUIRE(node != nullptr);
+
+          gd::ExpressionValidator validator(platform, projectScopedContainers, "number|string");
+          node->Visit(validator);
+
+          REQUIRE(validator.GetFatalErrors().size() == 0);
+        }
+      }
+    }
+  }
+
+  SECTION("Invalid operators with variables having different types than the expression") {
+    // Try to do a sum between numbers in a string expression
+    {
+      auto node = parser.ParseExpression("\"You have \" + MySceneNumberVariable + 2 + \" points\"");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "string");
+      node->Visit(validator);
+
+      REQUIRE(validator.GetFatalErrors().size() == 1);
+      REQUIRE(validator.GetFatalErrors()[0]->GetMessage() == "You entered a number, but a text was expected (in quotes).");
+      REQUIRE(validator.GetFatalErrors()[0]->GetStartPosition() == 38);
+      REQUIRE(validator.GetFatalErrors()[0]->GetEndPosition() == 39);
+    }
+    // Try to do a sum between numbers in a number|string expression (that is inferred as a string with the first operand)
+    {
+      auto node = parser.ParseExpression("\"You have \" + MySceneNumberVariable + 2 + \" points\"");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "string");
+      node->Visit(validator);
+
+      REQUIRE(validator.GetFatalErrors().size() == 1);
+      REQUIRE(validator.GetFatalErrors()[0]->GetMessage() == "You entered a number, but a text was expected (in quotes).");
+      REQUIRE(validator.GetFatalErrors()[0]->GetStartPosition() == 38);
+      REQUIRE(validator.GetFatalErrors()[0]->GetEndPosition() == 39);
+    }
+    // Try to do a string concatenation in a number expression
+    {
+      auto node = parser.ParseExpression("123 + MySceneStringVariable + \"hello\" + 456");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "number");
+      node->Visit(validator);
+
+      REQUIRE(validator.GetFatalErrors().size() == 1);
+      REQUIRE(validator.GetFatalErrors()[0]->GetMessage() == "You entered a text, but a number was expected.");
+      REQUIRE(validator.GetFatalErrors()[0]->GetStartPosition() == 30);
+      REQUIRE(validator.GetFatalErrors()[0]->GetEndPosition() == 37);
+    }
+    // Try to do a string concatenation in a number|string expression (that is inferred as a number with the first operand)
+    {
+      auto node = parser.ParseExpression("123 + MySceneStringVariable + \"hello\" + 456");
+      REQUIRE(node != nullptr);
+
+      gd::ExpressionValidator validator(platform, projectScopedContainers, "number|string");
+      node->Visit(validator);
+
+      REQUIRE(validator.GetFatalErrors().size() == 1);
+      REQUIRE(validator.GetFatalErrors()[0]->GetMessage() == "You entered a text, but a number was expected.");
+      REQUIRE(validator.GetFatalErrors()[0]->GetStartPosition() == 30);
+      REQUIRE(validator.GetFatalErrors()[0]->GetEndPosition() == 37);
+    }
+  }
+
   SECTION("Valid function call with object variable") {
     {
       // Note that in this test we need to use an expression with "objectvar",
@@ -2986,10 +3392,10 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
       REQUIRE(variable2ObjectName == "MySpriteObject2");
 
       // Also check the ability to find the last parent of the variables:
-      auto lastParentOfVariable1Node = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfVariable1Node = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, variable1Node);
       REQUIRE(lastParentOfVariable1Node.parentVariablesContainer == &mySpriteObject.GetVariables());
-      auto lastParentOfVariable2Node = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfVariable2Node = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, variable2Node);
       REQUIRE(lastParentOfVariable2Node.parentVariablesContainer == &mySpriteObject2.GetVariables());
 
@@ -3025,10 +3431,10 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
       REQUIRE(variable2ObjectName == "MySpriteObject");
 
       // Also check the ability to find the last parent of the variables:
-      auto lastParentOfVariable1Node = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfVariable1Node = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, variable1Node);
       REQUIRE(lastParentOfVariable1Node.parentVariablesContainer == &mySpriteObject.GetVariables());
-      auto lastParentOfVariable2Node = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfVariable2Node = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, variable2Node);
       REQUIRE(lastParentOfVariable2Node.parentVariablesContainer == &mySpriteObject.GetVariables());
 
@@ -3054,7 +3460,7 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
       REQUIRE(variable1ObjectName == "MySpriteObject");
 
       // Also check the ability to find the last parent of the variable:
-      auto lastParentOfVariable1Node = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfVariable1Node = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, variable1Node);
       REQUIRE(lastParentOfVariable1Node.parentVariablesContainer == &mySpriteObject.GetVariables());
 
@@ -3081,7 +3487,7 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
       REQUIRE(variable1ObjectName == "MySpriteObject");
 
       // Also check the ability to find the last parent of the variable:
-      auto lastParentOfVariable1Node = gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+      auto lastParentOfVariable1Node = gd::ExpressionVariablePathFinder::GetLastParentOfNode(
           platform, projectScopedContainers, variable1Node);
       REQUIRE(lastParentOfVariable1Node.parentVariable == &mySpriteObject.GetVariables().Get("MyVariable"));
 

Core/tests/ObjectAssetSerializer.cpp

@@ -71,7 +71,7 @@ TEST_CASE("ObjectAssetSerializer", "[common]") {
       frame.SetImageName("assets/Idle.png");
       direction.AddSprite(frame);
 
-      spriteConfiguration->AddAnimation(animation);
+      spriteConfiguration->GetAnimations().AddAnimation(animation);
     }
 
     SerializerElement assetElement;

Core/tests/ObjectSerialization.cpp

@@ -35,7 +35,7 @@ void SetupSpriteConfiguration(gd::ObjectConfiguration &configuration) {
   REQUIRE(spriteConfiguration != nullptr);
   gd::Animation animation;
   animation.SetName("Idle");
-  spriteConfiguration->AddAnimation(animation);
+  spriteConfiguration->GetAnimations().AddAnimation(animation);
 };
 
 gd::Object &SetupProjectWithSprite(gd::Project &project,
@@ -83,9 +83,9 @@ void CheckSpriteConfigurationInProjectElement(
 void CheckSpriteConfiguration(gd::ObjectConfiguration &configuration) {
   auto *spriteConfiguration = dynamic_cast<gd::SpriteObject *>(&configuration);
   REQUIRE(spriteConfiguration);
-  REQUIRE(spriteConfiguration->GetAnimationsCount() == 1);
+  REQUIRE(spriteConfiguration->GetAnimations().GetAnimationsCount() == 1);
 
-  auto &animation = spriteConfiguration->GetAnimation(0);
+  auto &animation = spriteConfiguration->GetAnimations().GetAnimation(0);
   REQUIRE(animation.GetName() == "Idle");
 };
 

Core/tests/WholeProjectRefactorer.cpp

@@ -1214,10 +1214,10 @@ TEST_CASE("WholeProjectRefactorer", "[common]") {
       layout1.InsertNewObject(project, "MyExtension::Sprite", "Object1", 0);
       layout1.InsertNewObject(project, "MyExtension::Sprite", "Object2", 0);
 
-      gd::WholeProjectRefactorer::ObjectOrGroupRemovedInLayout(
-          project, layout1, "Object1", /* isObjectGroup =*/false);
-      gd::WholeProjectRefactorer::GlobalObjectOrGroupRemoved(
-          project, "GlobalObject1", /* isObjectGroup =*/false);
+      gd::WholeProjectRefactorer::ObjectRemovedInLayout(
+          project, layout1, "Object1");
+      gd::WholeProjectRefactorer::GlobalObjectRemoved(
+          project, "GlobalObject1");
       REQUIRE(layout1.GetObjectGroups()[0].Find("Object1") == false);
       REQUIRE(layout1.GetObjectGroups()[0].Find("Object2") == true);
       REQUIRE(layout1.GetObjectGroups()[0].Find("NotExistingObject") == true);
@@ -1243,10 +1243,10 @@ TEST_CASE("WholeProjectRefactorer", "[common]") {
       layout1.GetInitialInstances().InsertInitialInstance(instance2);
       layout1.GetInitialInstances().InsertInitialInstance(instance3);
 
-      gd::WholeProjectRefactorer::ObjectOrGroupRemovedInLayout(
-          project, layout1, "Object1", /* isObjectGroup =*/false);
-      gd::WholeProjectRefactorer::GlobalObjectOrGroupRemoved(
-          project, "GlobalObject1", /* isObjectGroup =*/false);
+      gd::WholeProjectRefactorer::ObjectRemovedInLayout(
+          project, layout1, "Object1");
+      gd::WholeProjectRefactorer::GlobalObjectRemoved(
+          project, "GlobalObject1");
       REQUIRE(layout1.GetInitialInstances().HasInstancesOfObject("Object1") ==
               false);
       REQUIRE(layout1.GetInitialInstances().HasInstancesOfObject("Object2") ==
@@ -1285,10 +1285,10 @@ TEST_CASE("WholeProjectRefactorer", "[common]") {
       externalLayout2.GetInitialInstances().InsertInitialInstance(instance2);
       externalLayout2.GetInitialInstances().InsertInitialInstance(instance3);
 
-      gd::WholeProjectRefactorer::ObjectOrGroupRemovedInLayout(
-          project, layout1, "Object1", /* isObjectGroup =*/false);
-      gd::WholeProjectRefactorer::GlobalObjectOrGroupRemoved(
-          project, "GlobalObject1", /* isObjectGroup =*/false);
+      gd::WholeProjectRefactorer::ObjectRemovedInLayout(
+          project, layout1, "Object1");
+      gd::WholeProjectRefactorer::GlobalObjectRemoved(
+          project, "GlobalObject1");
       REQUIRE(externalLayout1.GetInitialInstances().HasInstancesOfObject(
                   "Object1") == false);
       REQUIRE(externalLayout1.GetInitialInstances().HasInstancesOfObject(
@@ -1302,29 +1302,6 @@ TEST_CASE("WholeProjectRefactorer", "[common]") {
       REQUIRE(externalLayout2.GetInitialInstances().HasInstancesOfObject(
                   "GlobalObject1") == false);
     }
-
-    SECTION("Events") {
-      gd::Project project;
-      gd::Platform platform;
-      SetupProjectWithDummyPlatform(project, platform);
-      auto &eventsExtension = SetupProjectWithEventsFunctionExtension(project);
-
-      auto &layout = project.GetLayout("Scene");
-
-      // Trigger the refactoring after removing an object
-      gd::WholeProjectRefactorer::ObjectOrGroupRemovedInLayout(
-          project, layout, "ObjectWithMyBehavior", /* isObjectGroup=*/false);
-
-      for (auto *eventsList : GetEventsListsAssociatedToScene(project)) {
-      // Check actions with the object in parameters have been removed.
-      REQUIRE(
-          AreActionsEmpty(eventsList->GetEvent(FreeFunctionWithObjects)));
-
-      // Check actions with the object in expressions have been removed.
-      REQUIRE(AreActionsEmpty(
-          eventsList->GetEvent(FreeFunctionWithObjectExpression)));
-      }
-    }
   }
 
   SECTION("Object renamed (in layout)") {
@@ -1471,30 +1448,6 @@ TEST_CASE("WholeProjectRefactorer", "[common]") {
     }
   }
 
-  SECTION("Group deleted (in layout)") {
-    SECTION("Events") {
-      gd::Project project;
-      gd::Platform platform;
-      SetupProjectWithDummyPlatform(project, platform);
-      auto &eventsExtension = SetupProjectWithEventsFunctionExtension(project);
-
-      auto &layout = project.GetLayout("Scene");
-
-      // Trigger the refactoring after removing a group
-      gd::WholeProjectRefactorer::ObjectOrGroupRemovedInLayout(
-          project, layout, "GroupWithMyBehavior", /* isObjectGroup=*/true);
-
-      for (auto *eventsList : GetEventsListsAssociatedToScene(project)) {
-        // Check actions with the group in parameters have been removed.
-        REQUIRE(AreActionsEmpty(eventsList->GetEvent(FreeFunctionWithGroup)));
-
-        // Check actions with the group in expressions have been removed.
-        REQUIRE(AreActionsEmpty(
-            eventsList->GetEvent(FreeFunctionWithObjectExpressionOnGroup)));
-      }
-    }
-  }
-
   SECTION("Group renamed (in layout)") {
     SECTION("Events") {
       gd::Project project;
@@ -1522,6 +1475,41 @@ TEST_CASE("WholeProjectRefactorer", "[common]") {
     }
   }
 
+  SECTION("Behaviors added to an object (in layout)") {
+    gd::Project project;
+    gd::Platform platform;
+    SetupProjectWithDummyPlatform(project, platform);
+
+    auto &scene = project.InsertNewLayout("Scene", 0);
+    auto &object =
+        scene.InsertNewObject(project, "MyExtension::Sprite", "Object", 0);
+
+    gd::StandardEvent &event =
+        dynamic_cast<gd::StandardEvent &>(scene.GetEvents().InsertNewEvent(
+            project, "BuiltinCommonInstructions::Standard"));
+    // Add a behavior instruction using an object that doesn't have the
+    // behavior.
+    {
+      gd::Instruction action;
+      action.SetType("MyExtension::BehaviorDoSomething");
+      action.SetParametersCount(3);
+      action.SetParameter(0, gd::Expression("Object"));
+      // The behavior parameter is left empty.
+      action.SetParameter(1, gd::Expression(""));
+      action.SetParameter(2, gd::Expression("0"));
+      event.GetActions().Insert(action);
+    }
+
+    // Attach the behavior to the object.
+    object.AddNewBehavior(project, "MyExtension::MyBehavior", "MyBehavior");
+    gd::WholeProjectRefactorer::BehaviorsAddedToObjectInLayout(project, scene,
+                                                               "Object");
+
+    // The behavior parameter is now filled.
+    REQUIRE(event.GetActions()[0].GetParameter(1).GetPlainString() ==
+            "MyBehavior");
+  }
+
   SECTION("Object renamed (in events function)") {
     SECTION("Group") {
       gd::Project project;
@@ -1664,10 +1652,9 @@ TEST_CASE("WholeProjectRefactorer", "[common]") {
     // test)
 
     // Trigger the refactoring after the renaming of an object
-    gd::WholeProjectRefactorer::ObjectOrGroupRemovedInEventsFunction(
+    gd::WholeProjectRefactorer::ObjectRemovedInEventsFunction(
         project, eventsFunction, globalObjectsContainer, objectsContainer,
-        "Object1",
-        /* isObjectGroup=*/false);
+        "Object1");
 
     REQUIRE(objectGroup.Find("Object1") == false);
     REQUIRE(objectGroup.Find("Object2") == true);

Extensions/3D/A_RuntimeObject3D.ts

@@ -13,6 +13,23 @@ namespace gdjs {
   const getValidDimensionValue = (value: float | undefined) =>
     value === undefined ? 100 : value <= 0 ? 1 : value;
 
+  type Object3DNetworkSyncDataType = {
+    // z is position on the Z axis, different from zo, which is Z order
+    z: number;
+    w: number;
+    h: number;
+    d: number;
+    rx: number;
+    ry: number;
+    // no need for rz, as it is the angle from gdjs.RuntimeObject
+    flipX: boolean;
+    flipY: boolean;
+    flipZ: boolean;
+  };
+
+  export type Object3DNetworkSyncData = ObjectNetworkSyncData &
+    Object3DNetworkSyncDataType;
+
   /**
    * Base class for 3D objects.
    */
@@ -109,6 +126,39 @@ namespace gdjs {
       return true;
     }
 
+    getNetworkSyncData(): Object3DNetworkSyncData {
+      return {
+        ...super.getNetworkSyncData(),
+        z: this.getZ(),
+        w: this.getWidth(),
+        h: this.getHeight(),
+        d: this.getDepth(),
+        rx: this.getRotationX(),
+        ry: this.getRotationY(),
+        flipX: this.isFlippedX(),
+        flipY: this.isFlippedY(),
+        flipZ: this.isFlippedZ(),
+      };
+    }
+
+    updateFromNetworkSyncData(networkSyncData: Object3DNetworkSyncData) {
+      super.updateFromNetworkSyncData(networkSyncData);
+      if (networkSyncData.z !== undefined) this.setZ(networkSyncData.z);
+      if (networkSyncData.w !== undefined) this.setWidth(networkSyncData.w);
+      if (networkSyncData.h !== undefined) this.setHeight(networkSyncData.h);
+      if (networkSyncData.d !== undefined) this.setDepth(networkSyncData.d);
+      if (networkSyncData.rx !== undefined)
+        this.setRotationX(networkSyncData.rx);
+      if (networkSyncData.ry !== undefined)
+        this.setRotationY(networkSyncData.ry);
+      if (networkSyncData.flipX !== undefined)
+        this.flipX(networkSyncData.flipX);
+      if (networkSyncData.flipY !== undefined)
+        this.flipY(networkSyncData.flipY);
+      if (networkSyncData.flipZ !== undefined)
+        this.flipZ(networkSyncData.flipZ);
+    }
+
     extraInitializationFromInitialInstance(initialInstanceData: InstanceData) {
       if (initialInstanceData.customSize) {
         this.setWidth(initialInstanceData.width);

Extensions/3D/AmbientLight.ts

@@ -1,4 +1,8 @@
 namespace gdjs {
+  interface AmbientLightFilterNetworkSyncData {
+    i: number;
+    c: number;
+  }
   gdjs.PixiFiltersTools.registerFilterCreator(
     'Scene3D::AmbientLight',
     new (class implements gdjs.PixiFiltersTools.FilterCreator {
@@ -86,6 +90,16 @@ namespace gdjs {
             return 0;
           }
           updateBooleanParameter(parameterName: string, value: boolean): void {}
+          getNetworkSyncData(): AmbientLightFilterNetworkSyncData {
+            return {
+              i: this.light.intensity,
+              c: this.light.color.getHex(),
+            };
+          }
+          updateFromNetworkSyncData(data: AmbientLightFilterNetworkSyncData) {
+            this.light.intensity = data.i;
+            this.light.color.setHex(data.c);
+          }
         })();
       }
     })()