Add missing event data (#7449)

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:
@@ -165,6 +176,7 @@ jobs:
 
   # Build the WebAssembly library only (so that it's cached on a S3 and easy to re-use).
   build-gdevelop_js-wasm-only:
+    resource_class: medium+ # Compilation time decrease linearly with the number of CPUs, but not linking (so "large" does not speedup total build time).
     docker:
       - image: cimg/node:16.13
 
@@ -221,10 +233,83 @@ jobs:
           name: Deploy to S3 (latest)
           command: aws s3 sync Binaries/embuild/GDevelop.js s3://gdevelop-gdevelop.js/$(git rev-parse --abbrev-ref HEAD)/latest/
 
+  # Build the WebAssembly library with clang-tidy and memory sanitizers.
+  build-gdevelop_js-debug-sanitizers-and-extra-checks:
+    resource_class: xlarge # Total time decrease linearly with the number of CPUs.
+    docker:
+      - image: cimg/node:16.13
+
+    working_directory: ~/GDevelop
+
+    steps:
+      - checkout
+      - aws-cli/setup
+
+      # System dependencies (for Emscripten)
+      - run:
+          name: Install dependencies for Emscripten
+          command: sudo apt-get update && sudo apt install cmake
+
+      - run:
+          name: Install dependencies for clang-tidy v19
+          command: wget https://apt.llvm.org/llvm.sh && chmod +x llvm.sh && sudo ./llvm.sh 19 && sudo apt install clang-tidy-19
+
+      - run:
+          name: Install Python3 dependencies for Emscripten
+          command: sudo apt install python-is-python3 python3-distutils -y
+
+      - run:
+          name: Install Emscripten (for GDevelop.js)
+          command: git clone https://github.com/juj/emsdk.git && cd emsdk && ./emsdk install 3.1.21 && ./emsdk activate 3.1.21 && cd ..
+
+      # GDevelop.js dependencies
+      - restore_cache:
+          keys:
+            - gdevelop.js-linux-nodejs-dependencies-{{ checksum "GDevelop.js/package-lock.json" }}
+            # fallback to using the latest cache if no exact match is found
+            - gdevelop.js-linux-nodejs-dependencies-
+
+      - run:
+          name: Install GDevelop.js dependencies and build it
+          command: cd GDevelop.js && npm install && cd ..
+
+      # Build GDevelop.js
+      - run:
+          name: Build GDevelop.js ('debug-sanitizers' variant)
+          command: cd GDevelop.js && source ../emsdk/emsdk_env.sh && npm run build -- --variant=debug-sanitizers
+
+      - run:
+          name: Run clang-tidy
+          command: cd GDevelop.js && npm run lint
+
+      - run:
+          name: Run tests
+          command: cd GDevelop.js && npm run test -- --maxWorkers=4
+
+      # Upload artifacts (CircleCI)
+      - store_artifacts:
+          path: Binaries/embuild/GDevelop.js
+
+      # Upload artifacts (AWS)
+      - run:
+          name: Deploy to S3 (specific commit)
+          command: aws s3 sync Binaries/embuild/GDevelop.js s3://gdevelop-gdevelop.js/$(git rev-parse --abbrev-ref HEAD)/variant/debug-sanitizers/commit/$(git rev-parse HEAD)/
+
 workflows:
-  builds:
+  gdevelop_js-wasm:
     jobs:
       - build-gdevelop_js-wasm-only
+  gdevelop_js-wasm-extra-checks:
+    jobs:
+      - build-gdevelop_js-debug-sanitizers-and-extra-checks:
+          # Extra checks are resource intensive so don't all run them.
+          filters:
+            branches:
+              only:
+                - master
+                - /experimental-build.*/
+  builds:
+    jobs:
       - build-macos:
           filters:
             branches:

.clang-tidy

@@ -0,0 +1,4 @@
+Checks: 'clang-diagnostic-*,clang-analyzer-*,cppcoreguidelines-*,-cppcoreguidelines-explicit-virtual-functions,-cppcoreguidelines-avoid-const-or-ref-data-members,-cppcoreguidelines-special-member-functions,-cppcoreguidelines-avoid-magic-numbers,-cppcoreguidelines-non-private-member-variables-in-classes,-cppcoreguidelines-owning-memory,-cppcoreguidelines-virtual-class-destructor,-clang-analyzer-optin.performance.Padding,-cppcoreguidelines-narrowing-conversions'
+WarningsAsErrors: 'cppcoreguidelines-pro-type-member-init, clang-analyzer-optin.cplusplus.UninitializedObject'
+HeaderFilterRegex: '.*'
+FormatStyle: none

.gitattributes

@@ -1,12 +1,12 @@
 Core/GDCore/Serialization/rapidjson/rapidjson.h/* linguist-vendored
-Core/GDCore/TinyXml/* linguist-vendored
 Extensions/ParticleSystem/SPARK/* linguist-vendored
 Extensions/PhysicsBehavior/Box2D/* linguist-vendored
 Extensions/PhysicsBehavior/box2djs/* linguist-vendored
 Extensions/Physics2Behavior/box2d.js linguist-vendored
+Extensions/Physics3DBehavior/*.wasm-compat.js linguist-vendored
 Extensions/BBText/pixi-multistyle-text/* linguist-vendored
 Extensions/P2P/A_peer.js linguist-vendored
+Extensions/Multiplayer/peer.js linguist-vendored
 Extensions/Shopify/shopify-buy.umd.polyfilled.min.js linguist-vendored
 Extensions/TileMap/pako/* linguist-vendored
 Extensions/TileMap/pixi-tilemap/* linguist-vendored
-Extensions/TweenBehavior/shifty.js linguist-vendored

.github/workflows/gdcore-tools-hook.yml

@@ -0,0 +1,22 @@
+# This worflow notifies arthuro555's gdcore-tools repository when a new release is published.
+#
+# This is used to allow gdcore-tools, a library to use GDCore outside of GDevelop,
+# to attempt to automatically build, test, and publish a release for the new
+# GDevelop version.
+name: Trigger gdcore-tools pipeline
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  dispatch-event:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Repository Dispatch
+        uses: peter-evans/repository-dispatch@v3
+        with:
+          token: ${{ secrets.GDCORE_TOOLS_PAT }}
+          repository: arthuro555/gdcore-tools
+          event-type: gdevelop-release
+          client-payload: '{"release": ${{ toJson(github.event.release) }}}'

.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/GDevelopExtensions.code-snippets

@@ -107,7 +107,7 @@
     "description": "Define a parameter in a GDevelop extension definition.",
     "prefix": "gdparam",
     "body": [
-      ".addParameter('${1|string,expression,object,behavior,yesorno,stringWithSelector,scenevar,globalvar,objectvar,objectList,objectListWithoutPicking,color,key,sceneName,file,layer,relationalOperator,operator,trueorfalse,musicfile,soundfile,police,mouse,passwordjoyaxis,camera,objectPtr,forceMultiplier|}', '${2:Parameter description}', '${3:Optional parameter data}', /*parameterIsOptional=*/${4|false,true|})"
+      ".addParameter('${1|string,expression,object,behavior,yesorno,stringWithSelector,scenevar,globalvar,objectvar,objectList,objectListWithoutPicking,color,key,sceneName,file,layer,relationalOperator,operator,trueorfalse,musicfile,soundfile,mouse,passwordjoyaxis,camera,objectPtr,forceMultiplier|}', '${2:Parameter description}', '${3:Optional parameter data}', /*parameterIsOptional=*/${4|false,true|})"
     ]
   },
   "Add code only parameter": {

.vscode/settings.json

@@ -114,7 +114,8 @@
     "__bits": "cpp",
     "__verbose_abort": "cpp",
     "variant": "cpp",
-    "charconv": "cpp"
+    "charconv": "cpp",
+    "execution": "cpp"
   },
   "files.exclude": {
     "Binaries/*build*": true,

CMakeLists.txt

@@ -60,7 +60,7 @@ if("${CMAKE_BUILD_TYPE}" STREQUAL "Release" AND NOT WIN32 AND CMAKE_COMPILER_IS_
 endif()
 
 #Activate C++11
-set(CMAKE_CXX_STANDARD 11) # Upgrading to C++17 would need to remove usage of bind2nd (should be easy).
+set(CMAKE_CXX_STANDARD 11) # Upgrading to C++17 should be tried.
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 # Mark some warnings as errors
@@ -69,12 +69,18 @@ if(CMAKE_CXX_COMPILER_ID STREQUAL "Clang")
 	# uninitialized variables or other hard to debug bugs.
 	add_compile_options(
 		-Wall
+		-Wextra
+		-Wuninitialized
+		-Wconditional-uninitialized
 		-Wno-unknown-warning-option
 		-Wno-reorder-ctor
 		-Wno-reorder
+		-Wno-unused-parameter
 		-Wno-pessimizing-move
-		-Wno-unused-variable
+		-Wno-unused-variable # Not a good style, but not a risk
 		-Wno-unused-private-field
+		-Wno-ignored-qualifiers # Not a risk
+		-Wno-sign-compare # Not a big risk
 
 		# Make as much warnings considered as errors as possible (only one for now).
 		-Werror=return-stack-address

Core/CMakeLists.txt

@@ -11,6 +11,11 @@ set(CMAKE_CXX_USE_RESPONSE_FILE_FOR_INCLUDES 1)
 set(GDCORE_include_dir ${GD_base_dir}/Core PARENT_SCOPE)
 set(GDCORE_lib_dir ${GD_base_dir}/Binaries/Output/${CMAKE_BUILD_TYPE}_${CMAKE_SYSTEM_NAME} PARENT_SCOPE)
 
+# Create VersionPriv.h - only useful for testing.
+if (NOT EMSCRIPTEN)
+	file(WRITE "${GD_base_dir}/Core/GDCore/Tools/VersionPriv.h" "#define GD_VERSION_STRING \"0.0.0-0\"")
+endif()
+
 # Dependencies on external libraries:
 #
 

Core/GDCore/DocMainPage.h

@@ -58,99 +58,7 @@
  * Common functions and tools for programming.
  */
 
-/**
- * \defgroup TinyXml Integrated TinyXml library
- *
- * See the full documentation of TinyXml [here](http://www.grinninglizard.com/tinyxmldocs/index.html).
- */
-
 /**
  * \defgroup SpriteObjectExtension Standard Sprite Object extension
  * \ingroup BuiltinExtensions
- */
-
-/**
- * \class TiXmlAttribute
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlAttributeSet
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlBase
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlComment
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlCursor
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlDeclaration
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlDocument
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlElement
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlHandle
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlNode
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlOutStream
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlParsingData
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlPrinter
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlString
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlText
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlUnknown
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
-/**
- * \class TiXmlVisitor
- * \brief Part of the tinyxml library
- * \ingroup TinyXml
- */
+ */

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/ForEachEvent.cpp

@@ -8,7 +8,6 @@
 #include "GDCore/Events/Serialization.h"
 #include "GDCore/Events/Tools/EventsCodeNameMangler.h"
 #include "GDCore/Serialization/SerializerElement.h"
-#include "GDCore/TinyXml/tinyxml.h"
 
 using namespace std;
 

Core/GDCore/Events/Builtin/GroupEvent.cpp

@@ -10,7 +10,6 @@
 #include "GDCore/Events/CodeGeneration/EventsCodeGenerator.h"
 #include "GDCore/Events/Serialization.h"
 #include "GDCore/Serialization/SerializerElement.h"
-#include "GDCore/TinyXml/tinyxml.h"
 
 using namespace std;
 

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/Builtin/WhileEvent.h

@@ -72,8 +72,6 @@ class GD_CORE_API WhileEvent : public gd::BaseEvent {
                               ///< de/activate infinite loop warning when the
                               ///< user create the event
 
-  mutable unsigned int whileConditionsHeight;
-
   int GetConditionsHeight() const;
   int GetActionsHeight() const;
   int GetWhileConditionsHeight() const;

Core/GDCore/Events/CodeGeneration/DiagnosticReport.h

@@ -0,0 +1,129 @@
+/*
+ * 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_; }
+
+  void LogAllDiagnostics() {
+    for (auto &diagnostic : projectDiagnostics) {
+      std::cout << diagnostic->GetMessage()
+                << "(object: " << diagnostic->GetObjectName()
+                << ", actual value: " << diagnostic->GetActualValue()
+                << ", expected value: " << diagnostic->GetExpectedValue() << ")"
+                << std::endl;
+    }
+  }
+
+ 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/EffectsCodeGenerator.cpp

@@ -15,6 +15,7 @@
 #include "GDCore/Project/Layout.h"
 #include "GDCore/Project/Object.h"
 #include "GDCore/Project/Project.h"
+#include "GDCore/Project/EventsFunctionsExtension.h"
 #include "GDCore/IDE/ProjectBrowserHelper.h"
 
 namespace gd {
@@ -47,6 +48,9 @@ void EffectsCodeGenerator::GenerateEffectsIncludeFiles(
   
   // TODO Merge with UsedExtensionsFinder.
 
+  // TODO Factorize with the iteration on all effects for resource exposure.
+  // TODO Implement an ArbitraryEffectWorker and add a method in ProjectBrowserHelper
+
   // See also gd::Project::ExposeResources for a method that traverse the whole
   // project (this time for resources) and
   // WholeProjectRefactorer::ExposeProjectEvents.
@@ -68,6 +72,27 @@ void EffectsCodeGenerator::GenerateEffectsIncludeFiles(
 
   // Add objects effects
   gd::ProjectBrowserHelper::ExposeProjectObjects(project, effectsCodeGenerator);
+
+  // Add event-based objects layouts effects
+  for (std::size_t s = 0; s < project.GetEventsFunctionsExtensionsCount();
+       s++) {
+    auto &eventsFunctionExtension = project.GetEventsFunctionsExtension(s);
+
+    auto &eventsBasedObjects = eventsFunctionExtension.GetEventsBasedObjects();
+    for (std::size_t objectIndex = 0;
+         objectIndex < eventsBasedObjects.GetCount(); ++objectIndex) {
+      auto &eventsBasedObject = eventsBasedObjects.Get(objectIndex);
+
+      auto &layers = eventsBasedObject.GetLayers();
+      for (std::size_t l = 0; l < layers.GetLayersCount(); ++l) {
+        auto &effects = layers.GetLayer(l).GetEffects();
+        for (std::size_t e = 0; e < effects.GetEffectsCount(); ++e) {
+          auto &effect = effects.GetEffect(e);
+          effectsCodeGenerator.AddEffectIncludeFiles(effect);
+        }
+      }
+    }
+  }
 }
 
 }  // 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"
@@ -41,14 +42,15 @@ gd::String EventsCodeGenerator::GenerateRelationalOperatorCall(
     const vector<gd::String>& arguments,
     const gd::String& callStartString,
     std::size_t startFromArgument) {
-  std::size_t relationalOperatorIndex = instrInfos.parameters.size();
-  for (std::size_t i = startFromArgument; i < instrInfos.parameters.size();
+  std::size_t relationalOperatorIndex = instrInfos.parameters.GetParametersCount();
+  for (std::size_t i = startFromArgument; i < instrInfos.parameters.GetParametersCount();
        ++i) {
-    if (instrInfos.parameters[i].GetType() == "relationalOperator")
+    if (instrInfos.parameters.GetParameter(i).GetType() == "relationalOperator") {
       relationalOperatorIndex = i;
+    }
   }
   // Ensure that there is at least one parameter after the relational operator
-  if (relationalOperatorIndex + 1 >= instrInfos.parameters.size()) {
+  if (relationalOperatorIndex + 1 >= instrInfos.parameters.GetParametersCount()) {
     ReportError();
     return "";
   }
@@ -75,11 +77,11 @@ gd::String EventsCodeGenerator::GenerateRelationalOperatorCall(
 
 /**
  * @brief Generate a relational operation
- * 
+ *
  * @param relationalOperator the operator
  * @param lhs the left hand operand
  * @param rhs the right hand operand
- * @return gd::String 
+ * @return gd::String
  */
 gd::String EventsCodeGenerator::GenerateRelationalOperation(
     const gd::String& relationalOperator,
@@ -121,14 +123,16 @@ gd::String EventsCodeGenerator::GenerateOperatorCall(
     const gd::String& callStartString,
     const gd::String& getterStartString,
     std::size_t startFromArgument) {
-  std::size_t operatorIndex = instrInfos.parameters.size();
-  for (std::size_t i = startFromArgument; i < instrInfos.parameters.size();
+  std::size_t operatorIndex = instrInfos.parameters.GetParametersCount();
+  for (std::size_t i = startFromArgument; i < instrInfos.parameters.GetParametersCount();
        ++i) {
-    if (instrInfos.parameters[i].GetType() == "operator") operatorIndex = i;
+    if (instrInfos.parameters.GetParameter(i).GetType() == "operator") {
+      operatorIndex = i;
+    }
   }
 
   // Ensure that there is at least one parameter after the operator
-  if (operatorIndex + 1 >= instrInfos.parameters.size()) {
+  if (operatorIndex + 1 >= instrInfos.parameters.GetParametersCount()) {
     ReportError();
     return "";
   }
@@ -190,14 +194,16 @@ gd::String EventsCodeGenerator::GenerateCompoundOperatorCall(
     const vector<gd::String>& arguments,
     const gd::String& callStartString,
     std::size_t startFromArgument) {
-  std::size_t operatorIndex = instrInfos.parameters.size();
-  for (std::size_t i = startFromArgument; i < instrInfos.parameters.size();
+  std::size_t operatorIndex = instrInfos.parameters.GetParametersCount();
+  for (std::size_t i = startFromArgument; i < instrInfos.parameters.GetParametersCount();
        ++i) {
-    if (instrInfos.parameters[i].GetType() == "operator") operatorIndex = i;
+    if (instrInfos.parameters.GetParameter(i).GetType() == "operator") {
+      operatorIndex = i;
+    }
   }
 
   // Ensure that there is at least one parameter after the operator
-  if (operatorIndex + 1 >= instrInfos.parameters.size()) {
+  if (operatorIndex + 1 >= instrInfos.parameters.GetParametersCount()) {
     ReportError();
     return "";
   }
@@ -241,25 +247,27 @@ gd::String EventsCodeGenerator::GenerateMutatorCall(
     const vector<gd::String>& arguments,
     const gd::String& callStartString,
     std::size_t startFromArgument) {
-  std::size_t operatorIndex = instrInfos.parameters.size();
-  for (std::size_t i = startFromArgument; i < instrInfos.parameters.size();
+  std::size_t operatorIndex = instrInfos.parameters.GetParametersCount();
+  for (std::size_t i = startFromArgument; i < instrInfos.parameters.GetParametersCount();
        ++i) {
-    if (instrInfos.parameters[i].GetType() == "operator") operatorIndex = i;
+    if (instrInfos.parameters.GetParameter(i).GetType() == "operator") {
+      operatorIndex = i;
+    }
   }
 
   // Ensure that there is at least one parameter after the operator
-  if (operatorIndex + 1 >= instrInfos.parameters.size()) {
+  if (operatorIndex + 1 >= instrInfos.parameters.GetParametersCount()) {
     ReportError();
     return "";
   }
 
   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 +287,9 @@ gd::String EventsCodeGenerator::GenerateMutatorCall(
       argumentsStr += arguments[i];
     }
   }
+  if (instrInfos.GetManipulatedType() == "boolean") {
+    return callStartString + "(" + argumentsStr + ")." + mutator->second;
+  }
 
   return callStartString + "(" + argumentsStr + ")." + mutator->second + "(" +
          rhs + ")";
@@ -312,23 +323,36 @@ gd::String EventsCodeGenerator::GenerateConditionCode(
   }
 
   // Insert code only parameters and be sure there is no lack of parameter.
-  while (condition.GetParameters().size() < instrInfos.parameters.size()) {
+  while (condition.GetParameters().size() < instrInfos.parameters.GetParametersCount()) {
     vector<gd::Expression> parameters = condition.GetParameters();
     parameters.push_back(gd::Expression(""));
     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())) {
+  for (std::size_t pNb = 0; pNb < instrInfos.parameters.GetParametersCount(); ++pNb) {
+    if (ParameterMetadata::IsObject(instrInfos.parameters.GetParameter(pNb).GetType())) {
       gd::String objectInParameter =
           condition.GetParameter(pNb).GetPlainString();
 
-      if (!GetObjectsContainersList().HasObjectOrGroupNamed(objectInParameter)) {
+      const auto &expectedObjectType =
+          instrInfos.parameters.GetParameter(pNb).GetExtraInfo();
+      const auto &actualObjectType =
+          GetObjectsContainersList().GetTypeOfObject(objectInParameter);
+      if (!GetObjectsContainersList().HasObjectOrGroupNamed(
+              objectInParameter)) {
+        gd::ProjectDiagnostic projectDiagnostic(
+            gd::ProjectDiagnostic::ErrorType::UnknownObject, "",
+            objectInParameter, "");
+        if (diagnosticReport) 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);
+        if (diagnosticReport) diagnosticReport->Add(projectDiagnostic);
         return "/* Mismatched object type - skipped. */";
       }
     }
@@ -336,7 +360,7 @@ gd::String EventsCodeGenerator::GenerateConditionCode(
 
   if (instrInfos.IsObjectInstruction()) {
     gd::String objectName = condition.GetParameter(0).GetPlainString();
-    if (!objectName.empty() && !instrInfos.parameters.empty()) {
+    if (!objectName.empty() && instrInfos.parameters.GetParametersCount() > 0) {
       std::vector<gd::String> realObjects =
           GetObjectsContainersList().ExpandObjectName(objectName, context.GetCurrentObject());
       for (std::size_t i = 0; i < realObjects.size(); ++i) {
@@ -364,15 +388,22 @@ 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) {
+    if (instrInfos.parameters.GetParametersCount() >= 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 +413,7 @@ gd::String EventsCodeGenerator::GenerateConditionCode(
             condition.GetParameters(), instrInfos.parameters, context);
         conditionCode += GenerateBehaviorCondition(
             realObjects[i],
-            condition.GetParameter(1).GetPlainString(),
+            behaviorName,
             autoInfo,
             arguments,
             instrInfos,
@@ -457,6 +488,33 @@ 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);
+            if (diagnosticReport) diagnosticReport->Add(projectDiagnostic);
+          }
+        }
+      });
+}
+
 /**
  * Generate code for an action.
  */
@@ -488,21 +546,35 @@ gd::String EventsCodeGenerator::GenerateActionCode(
           : instrInfos.codeExtraInformation.functionCallName;
 
   // Be sure there is no lack of parameter.
-  while (action.GetParameters().size() < instrInfos.parameters.size()) {
+  while (action.GetParameters().size() < instrInfos.parameters.GetParametersCount()) {
     vector<gd::Expression> parameters = action.GetParameters();
     parameters.push_back(gd::Expression(""));
     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())) {
+  for (std::size_t pNb = 0; pNb < instrInfos.parameters.GetParametersCount(); ++pNb) {
+    if (ParameterMetadata::IsObject(instrInfos.parameters.GetParameter(pNb).GetType())) {
       gd::String objectInParameter = action.GetParameter(pNb).GetPlainString();
-      if (!GetObjectsContainersList().HasObjectOrGroupNamed(objectInParameter)) {
+
+      const auto &expectedObjectType =
+          instrInfos.parameters.GetParameter(pNb).GetExtraInfo();
+      const auto &actualObjectType =
+          GetObjectsContainersList().GetTypeOfObject(objectInParameter);
+      if (!GetObjectsContainersList().HasObjectOrGroupNamed(
+              objectInParameter)) {
+        gd::ProjectDiagnostic projectDiagnostic(
+            gd::ProjectDiagnostic::ErrorType::UnknownObject, "",
+            objectInParameter, "");
+        if (diagnosticReport) 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);
+        if (diagnosticReport) diagnosticReport->Add(projectDiagnostic);
         return "/* Mismatched object type - skipped. */";
       }
     }
@@ -512,7 +584,7 @@ gd::String EventsCodeGenerator::GenerateActionCode(
   if (instrInfos.IsObjectInstruction()) {
     gd::String objectName = action.GetParameter(0).GetPlainString();
 
-    if (!instrInfos.parameters.empty()) {
+    if (instrInfos.parameters.GetParametersCount() > 0) {
       std::vector<gd::String> realObjects =
           GetObjectsContainersList().ExpandObjectName(objectName, context.GetCurrentObject());
       for (std::size_t i = 0; i < realObjects.size(); ++i) {
@@ -540,17 +612,22 @@ 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.GetParametersCount() >= 2) {
+      const gd::String &objectName = action.GetParameter(0).GetPlainString();
+      const gd::String &behaviorName = action.GetParameter(1).GetPlainString();
+      const gd::String &actualBehaviorType =
+          GetObjectsContainersList().GetTypeOfBehavior(behaviorName);
 
-    if (instrInfos.parameters.size() >= 2) {
       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 +636,7 @@ gd::String EventsCodeGenerator::GenerateActionCode(
             action.GetParameters(), instrInfos.parameters, context);
         actionCode +=
             GenerateBehaviorAction(realObjects[i],
-                                   action.GetParameter(1).GetPlainString(),
+                                   behaviorName,
                                    autoInfo,
                                    functionCallName,
                                    arguments,
@@ -583,6 +660,29 @@ 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 +707,23 @@ 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 +786,13 @@ 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 +804,8 @@ 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 = "=";
     }
@@ -718,7 +828,7 @@ gd::String EventsCodeGenerator::GenerateParameterCodes(
              metadata.GetType() == "spineResource" ||
              // Deprecated, old parameter names:
              metadata.GetType() == "password" || metadata.GetType() == "musicfile" ||
-             metadata.GetType() == "soundfile" || metadata.GetType() == "police") {
+             metadata.GetType() == "soundfile") {
     argOutput = "\"" + ConvertToString(parameter.GetPlainString()) + "\"";
   } else if (metadata.GetType() == "mouse") {
     argOutput = "\"" + ConvertToString(parameter.GetPlainString()) + "\"";
@@ -760,7 +870,7 @@ gd::String EventsCodeGenerator::GenerateParameterCodes(
 
 vector<gd::String> EventsCodeGenerator::GenerateParametersCodes(
     const vector<gd::Expression>& parameters,
-    const vector<gd::ParameterMetadata>& parametersInfo,
+    const ParameterMetadataContainer& parametersInfo,
     EventsCodeGenerationContext& context,
     std::vector<std::pair<gd::String, gd::String> >*
         supplementaryParametersTypes) {
@@ -865,6 +975,11 @@ 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 +1000,17 @@ 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;
@@ -988,10 +1107,10 @@ gd::String EventsCodeGenerator::GenerateFreeCondition(
 
   // Add logical not if needed
   bool conditionAlreadyTakeCareOfInversion = false;
-  for (std::size_t i = 0; i < instrInfos.parameters.size();
+  for (std::size_t i = 0; i < instrInfos.parameters.GetParametersCount();
        ++i)  // Some conditions already have a "conditionInverted" parameter
   {
-    if (instrInfos.parameters[i].GetType() == "conditionInverted")
+    if (instrInfos.parameters.GetParameter(i).GetType() == "conditionInverted")
       conditionAlreadyTakeCareOfInversion = true;
   }
   if (!conditionAlreadyTakeCareOfInversion && conditionInverted)
@@ -1012,7 +1131,7 @@ gd::String EventsCodeGenerator::GenerateObjectCondition(
   // Prepare call
   // Add a static_cast if necessary
   gd::String objectFunctionCallNamePart =
-      (!instrInfos.parameters[0].GetExtraInfo().empty())
+      (!instrInfos.parameters.GetParameter(0).GetExtraInfo().empty())
           ? "static_cast<" + objInfo.className + "*>(" +
                 GetObjectListName(objectName, context) + "[i])->" +
                 instrInfos.codeExtraInformation.functionCallName
@@ -1067,7 +1186,13 @@ gd::String EventsCodeGenerator::GenerateFreeAction(
   // Generate call
   gd::String call;
   if (instrInfos.codeExtraInformation.type == "number" ||
-      instrInfos.codeExtraInformation.type == "string") {
+      instrInfos.codeExtraInformation.type == "string" ||
+      // Boolean actions declared with addExpressionAndConditionAndAction uses
+      // MutatorAndOrAccessor even though they don't declare an operator parameter.
+      // Boolean operators are only used with SetMutators or SetCustomCodeGenerator.
+      (instrInfos.codeExtraInformation.type == "boolean" &&
+       instrInfos.codeExtraInformation.accessType ==
+           gd::InstructionMetadata::ExtraInformation::AccessType::Mutators)) {
     if (instrInfos.codeExtraInformation.accessType ==
         gd::InstructionMetadata::ExtraInformation::MutatorAndOrAccessor)
       call = GenerateOperatorCall(
@@ -1233,12 +1358,30 @@ gd::String EventsCodeGenerator::GeneratePropertyGetter(const gd::PropertiesConta
   return "getProperty" + property.GetName() + "As" + type + "()";
 }
 
+gd::String EventsCodeGenerator::GeneratePropertyGetterWithoutCasting(
+    const gd::PropertiesContainer &propertiesContainer,
+    const gd::NamedPropertyDescriptor &property) {
+  return "getProperty" + property.GetName() + "()";
+}
+
+gd::String EventsCodeGenerator::GeneratePropertySetterWithoutCasting(
+    const gd::PropertiesContainer &propertiesContainer,
+    const gd::NamedPropertyDescriptor &property,
+    const gd::String &operandCode) {
+  return "setProperty" + property.GetName() + "(" + operandCode + ")";
+    }
+
 gd::String EventsCodeGenerator::GenerateParameterGetter(const gd::ParameterMetadata& parameter,
                                                         const gd::String& type,
                                                         gd::EventsCodeGenerationContext& context) {
   return "getParameter" + parameter.GetName() + "As" + type + "()";
 }
 
+gd::String EventsCodeGenerator::GenerateParameterGetterWithoutCasting(
+    const gd::ParameterMetadata &parameter) {
+      return "getParameter" + parameter.GetName() + "()";
+    }
+
 EventsCodeGenerator::EventsCodeGenerator(const gd::Project& project_,
                                          const gd::Layout& layout,
                                          const gd::Platform& platform_)
@@ -1251,7 +1394,8 @@ 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 +1409,7 @@ 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;
@@ -127,7 +128,7 @@ class GD_CORE_API EventsCodeGenerator {
    */
   std::vector<gd::String> GenerateParametersCodes(
       const std::vector<gd::Expression>& parameters,
-      const std::vector<gd::ParameterMetadata>& parametersInfo,
+      const ParameterMetadataContainer& parametersInfo,
       EventsCodeGenerationContext& context,
       std::vector<std::pair<gd::String, gd::String> >*
           supplementaryParametersTypes = 0);
@@ -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 +467,14 @@ 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,
+    VARIABLE_OR_PROPERTY,
+    VARIABLE_OR_PROPERTY_OR_PARAMETER
+  };
 
   /**
    * Generate a single unique number for the specified instruction.
@@ -478,7 +504,25 @@ 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);
+
+  virtual gd::String GeneratePropertySetterWithoutCasting(
+      const gd::PropertiesContainer &propertiesContainer,
+      const gd::NamedPropertyDescriptor &property,
+      const gd::String &operandCode);
+
+protected:
   virtual const gd::String GenerateRelationalOperatorCodes(
       const gd::String& operatorString);
 
@@ -496,7 +540,7 @@ class GD_CORE_API EventsCodeGenerator {
   parameter -> string
    * - operator : Used to update a value using a setter and a getter -> string
    * - key, mouse, objectvar, scenevar, globalvar, password, musicfile,
-  soundfile, police -> string
+  soundfile -> string
    * - trueorfalse, yesorno -> boolean ( See GenerateTrue/GenerateFalse ).
    *
    * <br><br>
@@ -533,12 +577,19 @@ class GD_CORE_API EventsCodeGenerator {
       const gd::String& variableName,
       const VariableScope& scope,
       gd::EventsCodeGenerationContext& context,
-      const gd::String& objectName) {
+      const gd::String& objectName,
+      bool hasChild) {
+    // 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 || scope == VARIABLE_OR_PROPERTY ||
+               scope == VARIABLE_OR_PROPERTY_OR_PARAMETER) {
+      // TODO Split the 3 cases to make tests stronger.
+      return "getAnyVariable(" + variableName + ")";
     }
 
     return "getVariableForObject(" + objectName + ", " + variableName + ")";
@@ -591,11 +642,18 @@ class GD_CORE_API EventsCodeGenerator {
       const gd::String& type,
       gd::EventsCodeGenerationContext& context);
 
+  virtual gd::String GeneratePropertyGetterWithoutCasting(
+      const gd::PropertiesContainer &propertiesContainer,
+      const gd::NamedPropertyDescriptor &property);
+
   virtual gd::String GenerateParameterGetter(
       const gd::ParameterMetadata& parameter,
       const gd::String& type,
       gd::EventsCodeGenerationContext& context);
 
+  virtual gd::String
+  GenerateParameterGetterWithoutCasting(const gd::ParameterMetadata &parameter);
+
   /**
    * \brief Generate the code to reference an object which is
    * in an empty/null state.
@@ -779,6 +837,10 @@ 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 +871,9 @@ 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);
   }
 
@@ -110,18 +133,22 @@ 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"
-            ? gd::EventsCodeGenerator::PROJECT_VARIABLE
-            : ((type == "scenevar")
-                  ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
-                  : gd::EventsCodeGenerator::OBJECT_VARIABLE);
+        type == "variable"
+            ? gd::EventsCodeGenerator::ANY_VARIABLE
+        : type == "variableOrProperty"
+            ? gd::EventsCodeGenerator::VARIABLE_OR_PROPERTY
+        : type == "variableOrPropertyOrParameter"
+            ? gd::EventsCodeGenerator::VARIABLE_OR_PROPERTY_OR_PARAMETER
+        : type == "globalvar" ? gd::EventsCodeGenerator::PROJECT_VARIABLE
+        : type == "scenevar"  ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
+                              : gd::EventsCodeGenerator::OBJECT_VARIABLE;
 
     auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(codeGenerator.GetPlatform(),
                                           codeGenerator.GetObjectsContainersList(),
                                           rootObjectName,
                                           node);
     output += codeGenerator.GenerateGetVariable(
-        node.name, scope, context, objectName);
+        node.name, scope, context, objectName, node.child != nullptr);
     if (node.child) node.child->Visit(*this);
   } else {
     // The node represents a variable or an object variable in an expression waiting for its *value* to be returned.
@@ -137,19 +164,8 @@ 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, "", node.child != nullptr);
       if (node.child) node.child->Visit(*this);
       output += codeGenerator.GenerateVariableValueAs(type);
     }, [&]() {
@@ -170,8 +186,9 @@ void ExpressionCodeGenerator::OnVisitVariableAccessorNode(
     VariableAccessorNode& node) {
     if (!objectNameToUseForVariableAccessor.empty()) {
       // Use the name of the object passed by the parent, as we need both to access an object variable.
-      output += codeGenerator.GenerateGetVariable(node.name,
-          gd::EventsCodeGenerator::OBJECT_VARIABLE, context, objectNameToUseForVariableAccessor);
+      output += codeGenerator.GenerateGetVariable(
+          node.name, gd::EventsCodeGenerator::OBJECT_VARIABLE, context,
+          objectNameToUseForVariableAccessor, node.child != nullptr);
 
       // We have accessed an object variable, from now we can continue accessing the child variables
       // (including using the bracket notation).
@@ -208,22 +225,27 @@ void ExpressionCodeGenerator::OnVisitIdentifierNode(IdentifierNode& node) {
     output +=
         codeGenerator.GenerateObject(node.identifierName, type, context);
   } else if (gd::ParameterMetadata::IsExpression("variable", type)) {
-      EventsCodeGenerator::VariableScope scope =
-          type == "globalvar"
-              ? gd::EventsCodeGenerator::PROJECT_VARIABLE
-              : ((type == "scenevar")
-                    ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
-                    : gd::EventsCodeGenerator::OBJECT_VARIABLE);
+    EventsCodeGenerator::VariableScope scope =
+        type == "variable"
+            ? gd::EventsCodeGenerator::ANY_VARIABLE
+        : type == "variableOrProperty"
+            ? gd::EventsCodeGenerator::VARIABLE_OR_PROPERTY
+        : type == "variableOrPropertyOrParameter"
+            ? gd::EventsCodeGenerator::VARIABLE_OR_PROPERTY_OR_PARAMETER
+        : type == "globalvar" ? gd::EventsCodeGenerator::PROJECT_VARIABLE
+        : type == "scenevar"  ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
+                              : gd::EventsCodeGenerator::OBJECT_VARIABLE;
 
-      auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(codeGenerator.GetPlatform(),
-                                            codeGenerator.GetObjectsContainersList(),
-                                            rootObjectName,
-                                            node);
-      output += codeGenerator.GenerateGetVariable(
-          node.identifierName, scope, context, objectName);
-      if (!node.childIdentifierName.empty()) {
-        output += codeGenerator.GenerateVariableAccessor(node.childIdentifierName);
-      }
+    auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(
+        codeGenerator.GetPlatform(), codeGenerator.GetObjectsContainersList(),
+        rootObjectName, node);
+    output += codeGenerator.GenerateGetVariable(
+        node.identifierName, scope, context, objectName,
+        !node.childIdentifierName.empty());
+    if (!node.childIdentifierName.empty()) {
+      output +=
+          codeGenerator.GenerateVariableAccessor(node.childIdentifierName);
+    }
   } else {
     const auto& variablesContainersList = codeGenerator.GetProjectScopedContainers().GetVariablesContainersList();
     const auto& propertiesContainersList = codeGenerator.GetProjectScopedContainers().GetPropertiesContainersList();
@@ -233,22 +255,13 @@ void ExpressionCodeGenerator::OnVisitIdentifierNode(IdentifierNode& node) {
     codeGenerator.GetProjectScopedContainers().MatchIdentifierWithName<void>(node.identifierName, [&]() {
       // Generate the code to access the object variable.
       output += codeGenerator.GenerateGetVariable(
-        node.childIdentifierName, gd::EventsCodeGenerator::OBJECT_VARIABLE, context, node.identifierName);
+          node.childIdentifierName, gd::EventsCodeGenerator::OBJECT_VARIABLE,
+          context, node.identifierName, !node.childIdentifierName.empty());
       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::VARIABLE_OR_PROPERTY_OR_PARAMETER, context,
+          "", !node.childIdentifierName.empty());
       if (!node.childIdentifierName.empty()) {
         output += codeGenerator.GenerateVariableAccessor(node.childIdentifierName);
       }
@@ -424,11 +437,11 @@ gd::String ExpressionCodeGenerator::GenerateParametersCodes(
   size_t nonCodeOnlyParameterIndex = 0;
   gd::String parametersCode;
   for (std::size_t i = initialParameterIndex;
-       i < expressionMetadata.parameters.size();
+       i < expressionMetadata.GetParameters().GetParametersCount();
        ++i) {
     if (i != initialParameterIndex) parametersCode += ", ";
 
-    auto& parameterMetadata = expressionMetadata.parameters[i];
+    auto& parameterMetadata = expressionMetadata.GetParameters().GetParameter(i);
     if (!parameterMetadata.IsCodeOnly()) {
       if (nonCodeOnlyParameterIndex < parameters.size()) {
         auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(codeGenerator.GetPlatform(),

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

@@ -17,8 +17,7 @@
 namespace gd {
 
 EventsList BaseEvent::badSubEvents;
-std::vector<gd::String> BaseEvent::emptyDependencies;
-gd::String BaseEvent::emptySourceFile;
+VariablesContainer BaseEvent::badLocalVariables;
 
 BaseEvent::BaseEvent()
     : totalTimeDuringLastSession(0),
@@ -28,6 +27,8 @@ 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.
@@ -150,26 +175,6 @@ class GD_CORE_API BaseEvent {
         noExpr;
     return noExpr;
   };
-
-  /**
-   * \brief Returns the dependencies on source files of the project.
-   * \note Default implementation returns an empty list of dependencies. This is
-   * fine for most events that are not related to adding custom user source
-   * code.
-   */
-  virtual const std::vector<gd::String>& GetSourceFileDependencies() const {
-    return emptyDependencies;
-  };
-
-  /**
-   * \brief Returns the name of the source file associated with the event
-   * \note Default implementation returns an empty string. This is fine for most
-   * events that are not related to adding custom user source code.
-   */
-  virtual const gd::String& GetAssociatedGDManagedSourceFile(
-      gd::Project& project) const {
-    return emptySourceFile;
-  };
   ///@}
 
   /** \name Code generation
@@ -301,8 +306,7 @@ class GD_CORE_API BaseEvent {
                     ///< Used for saving the event for instance.
 
   static gd::EventsList badSubEvents;
-  static std::vector<gd::String> emptyDependencies;
-  static gd::String emptySourceFile;
+  static gd::VariablesContainer badLocalVariables;
 };
 
 /**
@@ -325,6 +329,3 @@ class EmptyEvent : public BaseEvent {
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_EVENT_H
-#endif

Core/GDCore/Events/EventsList.h

@@ -18,7 +18,6 @@ class BaseEvent;
 namespace gd {
 class SerializerElement;
 }
-class TiXmlElement;
 
 #undef CreateEvent
 

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;
@@ -36,54 +36,61 @@ struct GD_CORE_API ExpressionParserLocation {
 
  private:
   bool isValid;
-  size_t startPosition;
-  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;
+  size_t startPosition = 0;
+  size_t endPosition = 0;
 };
 
 /**
  * \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/Events/Serialization.cpp

@@ -182,10 +182,10 @@ void EventsListSerialization::UpdateInstructionsFromGD2x(
     // Common updates for some parameters
     const std::vector<gd::Expression>& parameters = instr.GetParameters();
     for (std::size_t j = 0;
-         j < parameters.size() && j < metadata.parameters.size();
+         j < parameters.size() && j < metadata.parameters.GetParametersCount();
          ++j) {
-      if (metadata.parameters[j].GetType() == "relationalOperator" ||
-          metadata.parameters[j].GetType() == "operator") {
+      if (metadata.parameters.GetParameter(j).GetType() == "relationalOperator" ||
+          metadata.parameters.GetParameter(j).GetType() == "operator") {
         if (j == parameters.size() - 1) {
           std::cout << "ERROR: No more parameters after a [relational]operator "
                        "when trying to update an instruction from GD2.x";

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();
 
@@ -109,7 +141,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAdvancedExtension(
                     "res/function32.png")
       .AddParameter("functionParameterName", _("Parameter name"), "number,string,boolean")
       .SetRelevantForFunctionEventsOnly()
-      .MarkAsAdvanced();
+      .MarkAsAdvanced()
+      .SetHidden();
 
   extension
       .AddExpression(
@@ -145,7 +178,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAdvancedExtension(
       .AddParameter("functionParameterName", _("Parameter name"), "number,string,boolean")
       .UseStandardRelationalOperatorParameters(
           "number", gd::ParameterOptions::MakeNewOptions())
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddCondition(
@@ -159,7 +193,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAdvancedExtension(
       .AddParameter("functionParameterName", _("Parameter name"), "number,string,boolean")
       .UseStandardRelationalOperatorParameters(
           "string", gd::ParameterOptions::MakeNewOptions())
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 }
 
 }  // namespace gd

Core/GDCore/Extensions/Builtin/BaseObjectExtension.cpp

@@ -117,7 +117,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Change the position of the center of _PARAM0_: _PARAM1_ "
                   "_PARAM2_ (x "
                   "axis), _PARAM3_ _PARAM4_ (y axis)"),
-                _("Position/Center"),
+                _("Position ❯ Center"),
                 "res/actions/position24_black.png",
                 "res/actions/position_black.png")
       .AddParameter("object", _("Object"))
@@ -133,7 +133,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Center X position"),
          _("the X position of the center of rotation"),
          _("the X position of the center"),
-         _("Position/Center"),
+         _("Position ❯ Center"),
          "res/actions/position24_black.png")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -144,7 +144,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Center Y position"),
          _("the Y position of the center of rotation"),
          _("the Y position of the center"),
-         _("Position/Center"),
+         _("Position ❯ Center"),
          "res/actions/position24_black.png")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -155,7 +155,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                                 _("the bounding box (the area encapsulating "
                                   "the object) left position"),
                                 _("the bounding box left position"),
-                                _("Position/Bounding Box"),
+                                _("Position ❯ Bounding Box"),
                                 "res/conditions/bounding-box-left_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -166,7 +166,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Bounding box top position"),
          _("the bounding box (the area encapsulating the object) top position"),
          _("the bounding box top position"),
-         _("Position/Bounding Box"),
+         _("Position ❯ Bounding Box"),
          "res/conditions/bounding-box-top_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -177,7 +177,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                                 _("the bounding box (the area encapsulating "
                                   "the object) right position"),
                                 _("the bounding box right position"),
-                                _("Position/Bounding Box"),
+                                _("Position ❯ Bounding Box"),
                                 "res/conditions/bounding-box-right_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -188,7 +188,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                                 _("the bounding box (the area encapsulating "
                                   "the object) bottom position"),
                                 _("the bounding box bottom position"),
-                                _("Position/Bounding Box"),
+                                _("Position ❯ Bounding Box"),
                                 "res/conditions/bounding-box-bottom_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -199,7 +199,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                                 _("the bounding box (the area encapsulating "
                                   "the object) center X position"),
                                 _("the bounding box center X position"),
-                                _("Position/Bounding Box"),
+                                _("Position ❯ Bounding Box"),
                                 "res/conditions/bounding-box-center_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -210,7 +210,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                                 _("the bounding box (the area encapsulating "
                                   "the object) center Y position"),
                                 _("the bounding box center Y position"),
-                                _("Position/Bounding Box"),
+                                _("Position ❯ Bounding Box"),
                                 "res/conditions/bounding-box-center_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -255,7 +255,6 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Angle"),
                 "res/actions/rotate24_black.png",
                 "res/actions/rotate_black.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angular speed (in degrees per second)"))
       .AddCodeOnlyParameter("currentScene", "")
@@ -269,7 +268,6 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Angle"),
          "res/actions/rotate24_black.png",
          "res/actions/rotate_black.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angle to rotate towards (in degrees)"))
       .AddParameter("expression", _("Angular speed (in degrees per second)"))
@@ -285,7 +283,6 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Angle"),
          "res/actions/rotate24_black.png",
          "res/actions/rotate_black.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("X position"))
       .AddParameter("expression", _("Y position"))
@@ -304,12 +301,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Movement using forces"),
          "res/actions/force24.png",
          "res/actions/force.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Speed on X axis (in pixels per second)"))
       .AddParameter("expression", _("Speed on Y axis (in pixels per second)"))
       .AddParameter("forceMultiplier", _("Force multiplier"), "", true)
-      .SetDefaultValue("0");
+      .SetDefaultValue("0")
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   obj.AddAction("AddForceAL",
                 _("Add a force (angle)"),
@@ -321,12 +318,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Movement using forces"),
                 "res/actions/force24.png",
                 "res/actions/force.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angle"))
       .AddParameter("expression", _("Speed (in pixels per second)"))
       .AddParameter("forceMultiplier", _("Force multiplier"), "", true)
       .SetDefaultValue("0")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddAction(
@@ -339,13 +336,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Movement using forces"),
          "res/actions/force24.png",
          "res/actions/force.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("X position"))
       .AddParameter("expression", _("Y position"))
       .AddParameter("expression", _("Speed (in pixels per second)"))
       .AddParameter("forceMultiplier", _("Force multiplier"), "", true)
       .SetDefaultValue("0")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddAction(
@@ -360,13 +357,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Movement using forces"),
          "res/actions/forceTourne24.png",
          "res/actions/forceTourne.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", "X position of the center")
       .AddParameter("expression", "Y position of the center")
       .AddParameter("expression", "Speed (in Degrees per seconds)")
       .AddParameter("expression", "Distance (in pixels)")
       .AddParameter("forceMultiplier", "Force multiplier")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .SetHidden();
 
   obj.AddAction("Arreter",
@@ -376,8 +373,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Movement using forces"),
                 "res/actions/arreter24.png",
                 "res/actions/arreter.png")
-
       .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddAction("Delete",
@@ -417,6 +414,99 @@ 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())
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .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())
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .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"))
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .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())
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .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())
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .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"))
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .SetRelevantForLayoutEventsOnly();
+
   obj.AddAction("ModVarObjet",
                 _("Change number variable"),
                 _("Modify the number value of an object variable."),
@@ -427,8 +517,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
 
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
+      .SetHelpPath("/all-features/variables/object-variables/")
       .UseStandardOperatorParameters("number",
-                                     ParameterOptions::MakeNewOptions());
+                                     ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction("ModVarObjetTxt",
                 _("Change text variable"),
@@ -440,8 +532,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
 
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
+      .SetHelpPath("/all-features/variables/object-variables/")
       .UseStandardOperatorParameters("string",
-                                     ParameterOptions::MakeNewOptions());
+                                     ParameterOptions::MakeNewOptions())
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction("SetObjectVariableAsBoolean",
                 _("Change boolean variable"),
@@ -454,7 +548,9 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
 
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
-      .AddParameter("trueorfalse", _("New Value:"));
+      .AddParameter("trueorfalse", _("New Value:"))
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction(
          "ToggleObjectVariableAsBoolean",
@@ -469,31 +565,35 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          "res/actions/var.png")
 
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Variable"));
+      .AddParameter("objectvar", _("Variable"))
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("ObjectVariableChildExists",
                    _("Child existence"),
                    _("Check if the specified child of the object "
                      "structure variable exists."),
                    _("Child _PARAM2_ of variable _PARAM1_ of _PARAM0_ exists"),
-                   _("Variables/Arrays and structures"),
+                   _("Variables ❯ Arrays and structures"),
                    "res/conditions/var24.png",
                    "res/conditions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Structure variable"))
       .AddParameter("string", _("Name of the child"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddAction("ObjectVariableRemoveChild",
                 _("Remove a child"),
                 _("Remove a child from an object structure variable."),
                 _("Remove child _PARAM2_ from variable _PARAM1_ of _PARAM0_"),
-                _("Variables/Arrays and structures"),
+                _("Variables ❯ Arrays and structures"),
                 "res/actions/var24.png",
                 "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Structure variable"))
       .AddParameter("string", _("Child's name"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddAction("ObjectVariableClearChildren",
@@ -501,11 +601,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Remove all the children from the object array or structure "
                   "variable."),
                 _("Clear children from variable _PARAM1_ of _PARAM0_"),
-                _("Variables/Arrays and structures"),
+                _("Variables ❯ Arrays and structures"),
                 "res/actions/var24.png",
                 "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array or structure variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddAction("Cache",
@@ -600,8 +701,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                    _("Movement using forces"),
                    "res/conditions/arret24.png",
                    "res/conditions/arret.png")
-
       .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddCondition("Vitesse",
@@ -611,10 +712,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                    _("Movement using forces"),
                    "res/conditions/vitesse24.png",
                    "res/conditions/vitesse.png")
-
       .AddParameter("object", _("Object"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   // Deprecated
@@ -631,6 +732,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angle, in degrees"))
       .AddParameter("expression", _("Tolerance, in degrees"))
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddCondition("IsTotalForceAngleAround",
@@ -644,6 +746,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angle, in degrees"))
       .AddParameter("expression", _("Tolerance, in degrees"))
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddCondition("VarObjet",
@@ -657,7 +760,9 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
-          "number", ParameterOptions::MakeNewOptions());
+          "number", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("VarObjetTxt",
                    _("Text variable"),
@@ -670,7 +775,9 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
-          "string", ParameterOptions::MakeNewOptions());
+          "string", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("ObjectVariableAsBoolean",
                    _("Boolean variable"),
@@ -683,7 +790,9 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .AddParameter("trueorfalse", _("Check if the value is"))
-      .SetDefaultValue("true");
+      .SetDefaultValue("true")
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("VarObjetDef",
                    "Variable defined",
@@ -697,12 +806,57 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .MarkAsAdvanced()
+      .SetRelevantForLayoutEventsOnly();
+
+  // Deprecated
   obj.AddAction(
          "ObjectVariablePush",
          _("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"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var24.png",
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
@@ -711,6 +865,25 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .SetParameterLongDescription(_("The content of the object variable will "
                                      "*be copied* and added at the "
                                      "end of the array."))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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."))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddAction(
@@ -718,38 +891,44 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Add text variable"),
          _("Adds a text (string) to the end of an object array variable."),
          _("Add text _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-         _("Variables/Arrays and structures"),
+         _("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();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .MarkAsAdvanced()
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction("ObjectVariablePushNumber",
                 _("Add number variable"),
                 _("Adds a number to the end of an object array variable."),
                 _("Add number _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-                _("Variables/Arrays and structures"),
+                _("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();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .MarkAsAdvanced()
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction(
          "ObjectVariablePushBool",
          _("Add boolean variable"),
          _("Adds a boolean to the end of an object array variable."),
          _("Add boolean _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-         _("Variables/Arrays and structures"),
+         _("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();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .MarkAsAdvanced()
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction(
          "ObjectVariableRemoveAt",
@@ -758,12 +937,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
            "variable."),
          _("Remove variable at index _PARAM2_ from array variable _PARAM1_ of "
            "_PARAM0_"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var24.png",
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("expression", _("Index to remove"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddCondition(
@@ -771,13 +951,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Number of children"),
          _("Compare the number of children in an object array variable."),
          _("The number of children in the array variable _PARAM1_"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/conditions/var24.png",
          "res/conditions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddStrExpression(
@@ -785,40 +966,44 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("First text child"),
          _("Get the value of the first element of an object array variable, if "
            "it is a text (string) variable."),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Array variable"));
+      .AddParameter("objectvar", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   obj.AddExpression(
          "ArrayVariableFirstNumber",
          _("First number child"),
          _("Get the value of the first element of an object array variable, if "
            "it is a number variable."),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Array variable"));
+      .AddParameter("objectvar", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   obj.AddStrExpression(
          "ArrayVariableLastString",
          _("Last text child"),
          _("Get the value of the last element of an object array variable, if "
            "it is a text (string) variable."),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Array variable"));
+      .AddParameter("objectvar", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   obj.AddExpression(
          "ArrayVariableLastNumber",
          _("Last number child"),
          _("Get the value of the last element of an object array variable, if "
            "it is a number variable."),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Array variable"));
+      .AddParameter("objectvar", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   obj.AddCondition("BehaviorActivated",
                    _("Behavior activated"),
@@ -853,12 +1038,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Movement using forces"),
                 "res/actions/forceVers24.png",
                 "res/actions/forceVers.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("objectPtr", _("Target Object"))
       .AddParameter("expression", _("Speed (in pixels per second)"))
       .AddParameter("forceMultiplier", _("Force multiplier"), "", true)
       .SetDefaultValue("0")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddAction(
@@ -873,13 +1058,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Movement using forces"),
          "res/actions/forceTourne24.png",
          "res/actions/forceTourne.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("objectPtr", _("Rotate around this object"))
       .AddParameter("expression", _("Speed (in degrees per second)"))
       .AddParameter("expression", _("Distance (in pixels)"))
       .AddParameter("forceMultiplier", _("Force multiplier"), "", true)
       .SetDefaultValue("0")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddAction("MettreAutour",
@@ -907,10 +1092,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Movement using forces"),
                 "res/actions/ecarter24.png",
                 "res/actions/ecarter.png")
-
       .SetHidden()
       .AddParameter("object", _("Object"))
-      .AddParameter("objectList", "Object 2 (won't move)");
+      .AddParameter("objectList", "Object 2 (won't move)")
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   // Deprecated action
   obj.AddAction("Ecarter",
@@ -934,7 +1119,6 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Position"),
                 "res/actions/ecarter24.png",
                 "res/actions/ecarter.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("objectList", _("Objects (won't move)"))
       .AddParameter("yesorno",
@@ -943,6 +1127,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     "",
                     true)
       .SetDefaultValue("no")
+      .SetHelpPath("/all-features/collisions/")
       .MarkAsSimple();
 
   obj.AddCondition("CollisionPoint",
@@ -955,6 +1140,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("X position of the point"))
       .AddParameter("expression", _("Y position of the point"))
+      .SetHelpPath("/all-features/collisions/")
       .MarkAsSimple();
 
   extension
@@ -986,6 +1172,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
       .AddParameter("expression", _("Time in seconds"))
+      .SetHelpPath("/all-features/timers-and-time/")
       .SetHidden();
 
   obj.AddCondition(
@@ -1001,6 +1188,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
       .AddParameter("relationalOperator", _("Sign of the test"), "time")
       .AddParameter("expression", _("Time in seconds"))
+      .SetHelpPath("/all-features/timers-and-time/")
       .SetManipulatedType("number");
 
   obj.AddCondition("ObjectTimerPaused",
@@ -1012,6 +1200,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                    "res/conditions/timerPaused.png")
       .AddParameter("object", _("Object"))
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/")
       .MarkAsAdvanced();
 
   obj.AddAction(
@@ -1024,7 +1213,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          "res/actions/timer24.png",
          "res/actions/timer.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("identifier", _("Timer's name"), "objectTimer");
+      .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/");
 
   obj.AddAction("PauseObjectTimer",
                 _("Pause an object timer"),
@@ -1035,6 +1225,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 "res/actions/pauseTimer.png")
       .AddParameter("object", _("Object"))
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/")
       .MarkAsAdvanced();
 
   obj.AddAction("UnPauseObjectTimer",
@@ -1046,6 +1237,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 "res/actions/unPauseTimer.png")
       .AddParameter("object", _("Object"))
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/")
       .MarkAsAdvanced();
 
   obj.AddAction("RemoveObjectTimer",
@@ -1057,6 +1249,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 "res/actions/timer.png")
       .AddParameter("object", _("Object"))
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/")
       .MarkAsAdvanced();
 
   obj.AddExpression("X",
@@ -1085,28 +1278,32 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     _("X coordinate of the sum of forces"),
                     _("Movement using forces"),
                     "res/actions/force.png")
-      .AddParameter("object", _("Object"));
+      .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   obj.AddExpression("ForceY",
                     _("Y coordinate of the sum of forces"),
                     _("Y coordinate of the sum of forces"),
                     _("Movement using forces"),
                     "res/actions/force.png")
-      .AddParameter("object", _("Object"));
+      .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   obj.AddExpression("ForceAngle",
                     _("Angle of the sum of forces"),
                     _("Angle of the sum of forces (in degrees)"),
                     _("Movement using forces"),
                     "res/actions/force.png")
-      .AddParameter("object", _("Object"));
+      .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   obj.AddExpression("ForceLength",
                     _("Length of the sum of forces"),
                     _("Length of the sum of forces"),
                     _("Movement using forces"),
                     "res/actions/force.png")
-      .AddParameter("object", _("Object"));
+      .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   obj.AddExpression("Longueur",
                     _("Length of the sum of forces"),
@@ -1114,6 +1311,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     _("Movement using forces"),
                     "res/actions/force.png")
       .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .SetHidden();
 
   obj.AddExpression("Width",
@@ -1203,16 +1401,18 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     _("Variables"),
                     "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Variable"));
+      .AddParameter("objectvar", _("Variable"))
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddExpression(
          "VariableChildCount",
          _("Number of children"),
          _("Number of children in an object array or structure variable"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Array or structure variable"));
+      .AddParameter("objectvar", _("Array or structure variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   obj.AddStrExpression("VariableString",
                        _("Text variable"),
@@ -1220,7 +1420,9 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                        _("Variables"),
                        "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Variable"));
+      .AddParameter("objectvar", _("Variable"))
+      .SetHelpPath("/all-features/variables/object-variables/")
+      .SetRelevantForFunctionEventsOnly();
 
   obj.AddExpression("ObjectTimerElapsedTime",
                     _("Object timer value"),
@@ -1228,7 +1430,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     _("Timers"),
                     "res/actions/time.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("identifier", _("Timer's name"), "objectTimer");
+      .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/");
 
   obj.AddExpression("AngleToObject",
                     _("Angle between two objects"),
@@ -1448,6 +1651,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
           "res/actions/doMove24.png",
           "res/actions/doMove.png")
       .AddCodeOnlyParameter("currentScene", "")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   extension
@@ -1463,6 +1667,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("objectList", _("Object 2"))
       .AddParameter("expression", _("Tolerance, in degrees"))
       .AddCodeOnlyParameter("conditionInverted", "")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   extension
@@ -1595,6 +1800,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     "",
                     true)
       .SetDefaultValue("no")
+      .SetHelpPath("/all-features/collisions/")
       .MarkAsSimple();
 
   extension
@@ -1610,6 +1816,22 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("expression",
                     _("Angle of tolerance, in degrees (0: minimum tolerance)"))
       .AddCodeOnlyParameter("conditionInverted", "")
+      .SetHidden()
+      .MarkAsAdvanced();
+
+  extension
+      .AddCondition("IsTurnedTowardObject",
+                    _("An object is turned toward another"),
+                    _("Check if an object is turned toward another"),
+                    _("_PARAM0_ is turned toward _PARAM1_ ± _PARAM2_°"),
+                    _("Angle"),
+                    "res/conditions/estTourne24.png",
+                    "res/conditions/estTourne.png")
+      .AddParameter("objectList", _("Name of the object"))
+      .AddParameter("objectList", _("Name of the second object"))
+      .AddParameter("expression",
+                    _("Angle of tolerance, in degrees (0: minimum tolerance)"))
+      .AddCodeOnlyParameter("conditionInverted", "")
       .MarkAsAdvanced();
 
   extension
@@ -1641,6 +1863,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
           _("Scene variable where to store the Y position of the intersection. "
             "If no intersection is found, the variable won't be changed."))
       .AddCodeOnlyParameter("conditionInverted", "")
+      .SetHelpPath("/all-features/collisions/")
       .MarkAsAdvanced();
 
   extension
@@ -1672,6 +1895,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
           _("Scene variable where to store the Y position of the intersection. "
             "If no intersection is found, the variable won't be changed."))
       .AddCodeOnlyParameter("conditionInverted", "")
+      .SetHelpPath("/all-features/collisions/")
       .MarkAsAdvanced();
 
   extension

Core/GDCore/Extensions/Builtin/CameraExtension.cpp

@@ -327,6 +327,25 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
       .AddParameter("expression", _("Camera number (default : 0)"), "", true)
       .SetDefaultValue("0");
 
+  extension
+      .AddCondition(
+          "CameraZoom",
+          _("Camera zoom"),
+          _("Compare the zoom of a camera of a layer."),
+          _("Zoom of camera _PARAM2_ of layer _PARAM1_"),
+          "",
+          "res/conditions/camera24.png",
+          "res/conditions/camera.png")
+      .AddCodeOnlyParameter("currentScene", "")
+      .AddParameter("layer", _("Layer"), "", true)
+      .SetDefaultValue("\"\"")
+      .AddParameter("expression", _("Camera number (default : 0)"), "", true)
+      .SetDefaultValue("0")
+      .UseStandardRelationalOperatorParameters(
+          "number", gd::ParameterOptions::MakeNewOptions().SetDescription(
+              _("Zoom")))
+      .MarkAsAdvanced();
+
   extension
       .AddAction(
           "FixCamera",

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/CommonInstructionsExtension.cpp

@@ -92,14 +92,16 @@ BuiltinExtensionsImplementer::ImplementsCommonInstructionsExtension(
       .SetCanHaveSubInstructions()
       .MarkAsAdvanced();
 
-  extension.AddCondition(
-      "Once",
-      _("Trigger once while true"),
-      _("Run actions only once, for each time the conditions have been met."),
-      _("Trigger once"),
-      "",
-      "res/conditions/once24.png",
-      "res/conditions/once.png");
+  extension
+      .AddCondition("Once",
+                    _("Trigger once while true"),
+                    _("Run actions only once, for each time the conditions "
+                      "have been met."),
+                    _("Trigger once"),
+                    "",
+                    "res/conditions/once24.png",
+                    "res/conditions/once.png")
+      .SetHelpPath("/all-features/advanced-conditions/trigger-once");
 
   extension
       .AddCondition("CompareNumbers",

Core/GDCore/Extensions/Builtin/ExternalLayoutsExtension.cpp

@@ -28,7 +28,7 @@ BuiltinExtensionsImplementer::ImplementsExternalLayoutsExtension(
       .AddAction("CreateObjectsFromExternalLayout",
                  _("Create objects from an external layout"),
                  _("Create objects from an external layout."),
-                 _("Create objects from the external layout named _PARAM1_"),
+                 _("Create objects from the external layout named _PARAM1_ at position _PARAM2_;_PARAM3_;_PARAM4_"),
                  "",
                  "res/ribbon_default/externallayout32.png",
                  "res/ribbon_default/externallayout32.png")

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/KeyboardExtension.cpp

@@ -35,7 +35,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsKeyboardExtension(
                     "res/conditions/keyboard24.png",
                     "res/conditions/keyboard.png")
       .AddCodeOnlyParameter("currentScene", "")
-      .AddParameter("key", _("Key"));
+      .AddParameter("key", _("Key to check"))
+      .SetHidden();
 
   extension
       .AddCondition("KeyReleased",
@@ -46,33 +47,32 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsKeyboardExtension(
                     "res/conditions/keyboard24.png",
                     "res/conditions/keyboard.png")
       .AddCodeOnlyParameter("currentScene", "")
-      .AddParameter("key", _("Key"));
+      .AddParameter("key", _("Key to check"))
+      .SetHidden();
 
   extension
       .AddCondition("KeyFromTextPressed",
-                    _("Key pressed (text expression)"),
-                    _("Check if a key, retrieved from the result of the "
-                      "expression, is pressed"),
+                    _("Key pressed"),
+                    _("Check if a key is pressed"),
                     _("_PARAM1_ key is pressed"),
                     "",
                     "res/conditions/keyboard24.png",
                     "res/conditions/keyboard.png")
       .AddCodeOnlyParameter("currentScene", "")
-      .AddParameter("string", _("Expression generating the key to check"))
-      .MarkAsAdvanced();
+      .AddParameter("keyboardKey", _("Key to check"))
+      .MarkAsSimple();
 
   extension
       .AddCondition("KeyFromTextReleased",
-                    _("Key released (text expression)"),
-                    _("Check if a key, retrieved from the result of the "
-                      "expression, was just released"),
+                    _("Key released"),
+                    _("Check if a key was just released"),
                     _("_PARAM1_ key is released"),
                     "",
                     "res/conditions/keyboard24.png",
                     "res/conditions/keyboard.png")
       .AddCodeOnlyParameter("currentScene", "")
-      .AddParameter("string", _("Expression generating the key to check"))
-      .MarkAsAdvanced();
+      .AddParameter("keyboardKey", _("Key to check"))
+      .MarkAsSimple();
 
   extension
       .AddCondition("AnyKeyPressed",

Core/GDCore/Extensions/Builtin/MathematicalToolsExtension.cpp

@@ -151,7 +151,8 @@ BuiltinExtensionsImplementer::ImplementsMathematicalToolsExtension(
   extension
       .AddExpression("abs",
                      _("Absolute value"),
-                     _("Absolute value"),
+                     _("Return the non-negative value by removing the sign. "
+                       "The absolute value of -8 is 8."),
                      "",
                      "res/mathfunction.png")
       .AddParameter("expression", _("Expression"));

Core/GDCore/Extensions/Builtin/MouseExtension.cpp

@@ -252,7 +252,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsMouseExtension(
                     "res/conditions/mouse.png")
       .AddCodeOnlyParameter("currentScene", "")
       .AddParameter("mouse", _("Button to check"))
-      .MarkAsSimple();
+      .MarkAsSimple()
+      .SetHidden();
 
   // Support for deprecated names:
   extension.AddDuplicatedCondition("SourisBouton", "MouseButtonPressed")
@@ -262,49 +263,41 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsMouseExtension(
       .AddCondition("MouseButtonReleased",
                     _("Mouse button released"),
                     _("Check if the specified mouse button was released."),
-                    _("_PARAM1_ mouse button was released"),
+                    _("Touch or _PARAM1_ mouse button is released"),
                     "",
                     "res/conditions/mouse24.png",
                     "res/conditions/mouse.png")
       .AddCodeOnlyParameter("currentScene", "")
       .AddParameter("mouse", _("Button to check"))
-      .MarkAsSimple();
+      .MarkAsSimple()
+      .SetHidden();
 
   extension
       .AddCondition(
           "MouseButtonFromTextPressed",
-          _("Mouse button pressed or touch held (text expression)"),
-          _("Check if a mouse button, retrieved from the result of the "
-            "expression, is pressed."),
-          _("_PARAM1_ mouse button is pressed"),
+          _("Mouse button pressed or touch held"),
+          _("Check if the specified mouse button is pressed or "
+              "if a touch is in contact with the screen."),
+          _("Touch or _PARAM1_ mouse button is down"),
           "",
           "res/conditions/mouse24.png",
           "res/conditions/mouse.png")
       .AddCodeOnlyParameter("currentScene", "")
-      .AddParameter("stringWithSelector",
-                    _("Expression generating the mouse button to check"),
-                    "[\"Left\", \"Right\", \"Middle\"]")
-      .SetParameterLongDescription(
-          _("Possible values are Left, Right and Middle."))
-      .MarkAsAdvanced();
+      .AddParameter("mouseButton", _("Button to check"))
+      .MarkAsSimple();
 
   extension
       .AddCondition(
           "MouseButtonFromTextReleased",
-          _("Mouse button released (text expression)"),
-          _("Check if a mouse button, retrieved from the result of the "
-            "expression, was just released."),
-          _("_PARAM1_ mouse button is released"),
+          _("Mouse button released"),
+          _("Check if the specified mouse button was released."),
+          _("Touch or _PARAM1_ mouse button is released"),
           "",
           "res/conditions/mouse24.png",
           "res/conditions/mouse.png")
       .AddCodeOnlyParameter("currentScene", "")
-      .AddParameter("stringWithSelector",
-                    _("Expression generating the mouse button to check"),
-                    "[\"Left\", \"Right\", \"Middle\"]")
-      .SetParameterLongDescription(
-          _("Possible values are Left, Right and Middle."))
-      .MarkAsAdvanced();
+      .AddParameter("mouseButton", _("Button to check"))
+      .MarkAsSimple();
 
   extension
       .AddExpressionAndCondition("number",
@@ -338,6 +331,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsMouseExtension(
       .AddParameter("expression", _("Camera number (default : 0)"), "", true)
       .SetDefaultValue("0");
 
+  // Deprecated
   extension
       .AddCondition(
           "PopStartedTouch",
@@ -354,6 +348,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsMouseExtension(
       .AddCodeOnlyParameter("currentScene", "")
       .SetHidden();
 
+  // Deprecated
   extension
       .AddCondition(
           "PopEndedTouch",
@@ -370,6 +365,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsMouseExtension(
       .AddCodeOnlyParameter("currentScene", "")
       .SetHidden();
 
+  // Deprecated
   extension
       .AddCondition(
           "HasAnyTouchStarted",

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

@@ -116,6 +116,13 @@ void SpriteAnimationList::ExposeResources(gd::ArbitraryResourceWorker& worker) {
   }
 }
 
+bool SpriteAnimationList::HasAnimationNamed(const gd::String &name) const {
+  return !name.empty() && (find_if(animations.begin(), animations.end(),
+                                   [&name](const Animation &animation) {
+                                     return animation.GetName() == name;
+                                   }) != animations.end());
+}
+
 const Animation& SpriteAnimationList::GetAnimation(std::size_t nb) const {
   if (nb >= animations.size()) return badAnimation;
 

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

@@ -51,6 +51,11 @@ class GD_CORE_API SpriteAnimationList {
    */
   std::size_t GetAnimationsCount() const { return animations.size(); };
 
+  /**
+   * \brief Return true if an animation exists for a given name.
+   */
+  bool HasAnimationNamed(const gd::String &name) const;
+
   /**
    * \brief Add an animation at the end of the existing ones.
    */

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

@@ -33,6 +33,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsSpriteExtension(
                                      "most elements of a game."),
                                    "CppPlatform/Extensions/spriteicon.png")
           .SetCategoryFullName(_("General"))
+          .SetOpenFullEditorLabel(_("Edit animations"))
           .AddDefaultBehavior("EffectCapability::EffectBehavior")
           .AddDefaultBehavior("ResizableCapability::ResizableBehavior")
           .AddDefaultBehavior("ScalableCapability::ScalableBehavior")

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

@@ -24,37 +24,34 @@
 namespace gd {
 
 SpriteObject::SpriteObject()
-    : updateIfNotVisible(false) {}
+    : updateIfNotVisible(false),
+      preScale(1) {}
 
 SpriteObject::~SpriteObject(){};
 
 void SpriteObject::DoUnserializeFrom(gd::Project& project,
                                      const gd::SerializerElement& element) {
   updateIfNotVisible = element.GetBoolAttribute("updateIfNotVisible", true);
+  preScale = element.GetDoubleAttribute("preScale", 1);
   animations.UnserializeFrom(element);
 }
 
 void SpriteObject::DoSerializeTo(gd::SerializerElement& element) const {
   element.SetAttribute("updateIfNotVisible", updateIfNotVisible);
+  if (preScale != 1) {
+    element.SetAttribute("preScale", preScale);
+  }
   animations.SerializeTo(element);
 }
 
 std::map<gd::String, gd::PropertyDescriptor> SpriteObject::GetProperties()
     const {
   std::map<gd::String, gd::PropertyDescriptor> properties;
-  properties[_("Animate even if hidden or far from the screen")]
-      .SetValue(updateIfNotVisible ? "true" : "false")
-      .SetType("Boolean");
-  properties["PLEASE_ALSO_SHOW_EDIT_BUTTON_THANKS"].SetValue("");
-
   return properties;
 }
 
 bool SpriteObject::UpdateProperty(const gd::String& name,
                                   const gd::String& value) {
-  if (name == _("Animate even if hidden or far from the screen"))
-    updateIfNotVisible = value == "1";
-
   return true;
 }
 
@@ -64,9 +61,7 @@ void SpriteObject::ExposeResources(gd::ArbitraryResourceWorker& worker) {
 
 std::map<gd::String, gd::PropertyDescriptor>
 SpriteObject::GetInitialInstanceProperties(
-    const gd::InitialInstance& initialInstance,
-    gd::Project& project,
-    gd::Layout& scene) {
+    const gd::InitialInstance& initialInstance) {
   std::map<gd::String, gd::PropertyDescriptor> properties;
   properties["animation"] =
       gd::PropertyDescriptor(
@@ -80,9 +75,7 @@ SpriteObject::GetInitialInstanceProperties(
 bool SpriteObject::UpdateInitialInstanceProperty(
     gd::InitialInstance& initialInstance,
     const gd::String& name,
-    const gd::String& value,
-    gd::Project& project,
-    gd::Layout& scene) {
+    const gd::String& value) {
   if (name == "animation") {
     initialInstance.SetRawDoubleProperty(
         "animation", std::max(0, value.empty() ? 0 : value.To<int>()));
@@ -91,6 +84,19 @@ bool SpriteObject::UpdateInitialInstanceProperty(
   return true;
 }
 
+size_t SpriteObject::GetAnimationsCount() const {
+  return animations.GetAnimationsCount();
+}
+
+const gd::String &SpriteObject::GetAnimationName(size_t index) const {
+  return animations.GetAnimation(index).GetName();
+}
+
+bool SpriteObject::HasAnimationNamed(
+    const gd::String &name) const {
+  return animations.HasAnimationNamed(name);
+}
+
 const SpriteAnimationList& SpriteObject::GetAnimations() const {
   return animations;
 }

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

@@ -47,15 +47,17 @@ class GD_CORE_API SpriteObject : public gd::ObjectConfiguration {
   bool UpdateProperty(const gd::String& name, const gd::String& value) override;
 
   std::map<gd::String, gd::PropertyDescriptor> GetInitialInstanceProperties(
-      const gd::InitialInstance& position,
-      gd::Project& project,
-      gd::Layout& scene) override;
+      const gd::InitialInstance& position) override;
   bool UpdateInitialInstanceProperty(gd::InitialInstance& position,
                                      const gd::String& name,
-                                     const gd::String& value,
-                                     gd::Project& project,
-                                     gd::Layout& scene) override;
+                                     const gd::String& value) override;
 
+  size_t GetAnimationsCount() const override;
+
+  const gd::String &GetAnimationName(size_t index) const override;
+
+  bool HasAnimationNamed(const gd::String &animationName) const override;
+  
   /**
    * \brief Return the animation configuration.
    */
@@ -80,6 +82,23 @@ class GD_CORE_API SpriteObject : public gd::ObjectConfiguration {
    */
   bool GetUpdateIfNotVisible() const { return updateIfNotVisible; }
 
+  /**
+   * \brief Return the scale applied to object to evaluate the default dimensions.
+   */
+  double GetPreScale() { return preScale; }
+
+  /**
+   * \brief Set the scale applied to object to evaluate the default dimensions.
+   * 
+   * Its value must be strictly positive.
+   */
+  void SetPreScale(double preScale_) {
+    if (preScale_ <= 0) {
+      return;
+    }
+    preScale = preScale_;
+  }
+
  private:
   void DoUnserializeFrom(gd::Project& project,
                          const gd::SerializerElement& element) override;
@@ -90,6 +109,7 @@ class GD_CORE_API SpriteObject : public gd::ObjectConfiguration {
   bool updateIfNotVisible;  ///< If set to true, ask the game engine to play
                             ///< object animation even if hidden or far from
                             ///< the screen.
+  double preScale;
 };
 
 }  // namespace gd

Core/GDCore/Extensions/Builtin/VariablesExtension.cpp

@@ -25,29 +25,286 @@ 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("variableOrPropertyOrParameter", _("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("variableOrPropertyOrParameter", _("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("variableOrPropertyOrParameter", _("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("variableOrProperty", _("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("variableOrProperty", _("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("variableOrProperty", _("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())
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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."))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
+
+  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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
+
+  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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
+
+  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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
+
+  // 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()
+      .SetHidden();
 
   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()
+      .SetHidden();
 
   extension
       .AddCondition(
@@ -55,12 +312,14 @@ 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()
+      .SetHidden();
 
   extension
       .AddCondition("VariableChildExists",
@@ -68,11 +327,14 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -81,11 +343,14 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -93,7 +358,7 @@ 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 +370,14 @@ 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()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -118,12 +385,14 @@ 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()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -132,19 +401,21 @@ 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()
+      .SetHidden();
 
   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 +428,28 @@ 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()
+      .SetHidden();
 
   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()
+      .SetHidden();
 
   extension
       .AddAction(
@@ -182,11 +457,13 @@ 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()
+      .SetHidden();
 
   extension
       .AddAction("ToggleSceneVariableAsBoolean",
@@ -195,22 +472,26 @@ 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()
+      .SetHidden();
 
   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()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -218,12 +499,14 @@ 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()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -232,11 +515,13 @@ 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()
+      .SetHidden();
 
   extension
       .AddAction("ToggleGlobalVariableAsBoolean",
@@ -245,10 +530,12 @@ 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()
+      .SetHidden();
 
   extension
       .AddAction(
@@ -256,12 +543,15 @@ 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();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .MarkAsAdvanced()
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction(
@@ -269,12 +559,15 @@ 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();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .MarkAsAdvanced()
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction("VariableClearChildren",
@@ -282,10 +575,13 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -294,10 +590,13 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -306,7 +605,7 @@ 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 +613,9 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
       .SetParameterLongDescription(
           _("The content of the variable will *be copied* and added at the "
             "end of the array."))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -322,11 +624,14 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -334,11 +639,14 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -346,11 +654,14 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -360,11 +671,14 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -373,12 +687,15 @@ 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())
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -387,9 +704,12 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddExpression(
@@ -397,9 +717,12 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddStrExpression(
@@ -407,9 +730,12 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddExpression(
@@ -417,9 +743,12 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction(
@@ -427,7 +756,7 @@ 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 +764,9 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
       .SetParameterLongDescription(
           _("The content of the variable will *be copied* and added at the "
             "end of the array."))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -444,11 +776,14 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -457,11 +792,14 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -469,11 +807,14 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -481,11 +822,14 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -494,12 +838,15 @@ 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())
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -507,18 +854,24 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddStrExpression(
@@ -526,9 +879,12 @@ 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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddExpression(
@@ -536,59 +892,73 @@ 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()
+      .SetHidden();
 
   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"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   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")
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   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()
+      .SetHidden();
 
   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()
+      .SetHidden();
 
   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()
+      .SetHidden();
 
   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()
+      .SetHidden();
 }
 
 }  // namespace gd

Core/GDCore/Extensions/Metadata/BehaviorMetadata.cpp

@@ -424,7 +424,7 @@ std::map<gd::String, gd::PropertyDescriptor> BehaviorMetadata::GetProperties() c
   return instance->GetProperties();
 }
 
-gd::BehaviorsSharedData* BehaviorMetadata::GetSharedDataInstance() const { 
+gd::BehaviorsSharedData* BehaviorMetadata::GetSharedDataInstance() const {
   return sharedDatasInstance.get();
 }
 
@@ -440,12 +440,18 @@ std::map<gd::String, gd::PropertyDescriptor> BehaviorMetadata::GetSharedProperti
 
 const std::vector<gd::String>& BehaviorMetadata::GetRequiredBehaviorTypes() const {
   requiredBehaviors.clear();
-  for (auto& property : Get().GetProperties()) {
+  if (!instance) {
+    return requiredBehaviors;
+  }
+  for (auto& property : instance->GetProperties()) {
     const String& propertyName = property.first;
     const gd::PropertyDescriptor& propertyDescriptor = property.second;
 
     if (propertyDescriptor.GetType() == "Behavior") {
-      requiredBehaviors.push_back(propertyDescriptor.GetExtraInfo()[0]);
+      const auto& extraInfos = propertyDescriptor.GetExtraInfo();
+      if (extraInfos.size() > 0) {
+        requiredBehaviors.push_back(extraInfos[0]);
+      }
     }
   }
   return requiredBehaviors;

Core/GDCore/Extensions/Metadata/BehaviorMetadata.h

@@ -12,6 +12,7 @@
 #include "GDCore/Extensions/Metadata/ExpressionMetadata.h"
 #include "GDCore/Extensions/Metadata/InstructionMetadata.h"
 #include "GDCore/String.h"
+#include "GDCore/Project/QuickCustomization.h"
 namespace gd {
 class Behavior;
 class BehaviorsSharedData;
@@ -41,10 +42,10 @@ class GD_CORE_API BehaviorMetadata : public InstructionOrExpressionContainerMeta
       const gd::String& className_,
       std::shared_ptr<gd::Behavior> instance,
       std::shared_ptr<gd::BehaviorsSharedData> sharedDatasInstance);
-      
+
   /**
    * \brief Construct a behavior metadata, without "blueprint" behavior.
-   * 
+   *
    * \note This is used by events based behaviors.
    */
   BehaviorMetadata(
@@ -271,7 +272,7 @@ class GD_CORE_API BehaviorMetadata : public InstructionOrExpressionContainerMeta
    * Check if the behavior is private - it can't be used outside of its
    * extension.
    */
-  bool IsPrivate() const { return isPrivate; }
+  bool IsPrivate() const override { return isPrivate; }
 
   /**
    * Set that the behavior is private - it can't be used outside of its
@@ -297,9 +298,27 @@ class GD_CORE_API BehaviorMetadata : public InstructionOrExpressionContainerMeta
     return *this;
   }
 
+  QuickCustomization::Visibility GetQuickCustomizationVisibility() const {
+    return quickCustomizationVisibility;
+  }
+
+  BehaviorMetadata &SetQuickCustomizationVisibility(QuickCustomization::Visibility visibility) {
+    quickCustomizationVisibility = visibility;
+    return *this;
+  }
+
+  BehaviorMetadata &SetOpenFullEditorLabel(const gd::String& label) {
+    openFullEditorLabel = label;
+    return *this;
+  }
+
+  const gd::String& GetOpenFullEditorLabel() const {
+    return openFullEditorLabel;
+  }
+
   /**
    * \brief Return the associated gd::Behavior, handling behavior contents.
-   * 
+   *
    * \note Returns a dumb Behavior for events based behaviors as CustomBehavior
    * are using EventBasedBehavior.
    */
@@ -317,7 +336,7 @@ class GD_CORE_API BehaviorMetadata : public InstructionOrExpressionContainerMeta
   /**
    * \brief Return the associated gd::BehaviorsSharedData, handling behavior
    * shared data, if any (nullptr if none).
-   * 
+   *
    * \note Returns nullptr for events based behaviors as they don't declare
    * shared data yet.
    */
@@ -374,6 +393,8 @@ class GD_CORE_API BehaviorMetadata : public InstructionOrExpressionContainerMeta
   mutable std::vector<gd::String> requiredBehaviors;
   bool isPrivate = false;
   bool isHidden = false;
+  gd::String openFullEditorLabel;
+  QuickCustomization::Visibility quickCustomizationVisibility = QuickCustomization::Visibility::Default;
 
   // TODO: Nitpicking: convert these to std::unique_ptr to clarify ownership.
   std::shared_ptr<gd::Behavior> instance;

Core/GDCore/Extensions/Metadata/EffectMetadata.h

@@ -185,10 +185,10 @@ class GD_CORE_API EffectMetadata {
   gd::String fullname;
   gd::String description;
   std::vector<gd::String> includeFiles;
-  bool isMarkedAsNotWorkingForObjects;
-  bool isMarkedAsOnlyWorkingFor2D;
-  bool isMarkedAsOnlyWorkingFor3D;
-  bool isMarkedAsUnique;
+  bool isMarkedAsNotWorkingForObjects = false;
+  bool isMarkedAsOnlyWorkingFor2D = false;
+  bool isMarkedAsOnlyWorkingFor3D = false;
+  bool isMarkedAsUnique = false;
   std::map<gd::String, gd::PropertyDescriptor> properties;
 };
 

Core/GDCore/Extensions/Metadata/EventMetadata.cpp

@@ -19,7 +19,8 @@ EventMetadata::EventMetadata(const gd::String &name_,
     : fullname(fullname_),
       description(description_),
       group(group_),
-      instance(instance_) {
+      instance(instance_),
+      hasCustomCodeGenerator(false) {
   ClearCodeGenerationAndPreprocessing();
   if (instance) instance->SetType(name_);
 }

Core/GDCore/Extensions/Metadata/EventMetadata.h

@@ -83,7 +83,7 @@ class GD_CORE_API EventMetadata {
   gd::String group;
 
   std::shared_ptr<gd::BaseEvent> instance;
-  bool hasCustomCodeGenerator;
+  bool hasCustomCodeGenerator = false;
   std::function<gd::String(gd::BaseEvent& event,
                            gd::EventsCodeGenerator& codeGenerator,
                            gd::EventsCodeGenerationContext& context)>

Core/GDCore/Extensions/Metadata/ExpressionMetadata.cpp

@@ -38,12 +38,12 @@ gd::ExpressionMetadata& ExpressionMetadata::AddParameter(
     const gd::String& description,
     const gd::String& supplementaryInformation,
     bool parameterIsOptional) {
-  gd::ParameterMetadata info;
-  info.SetType(type);
-  info.description = description;
-  info.codeOnly = false;
-  info.SetOptional(parameterIsOptional);
-  info.SetExtraInfo(
+  parameters.AddNewParameter("")
+  .SetType(type)
+  .SetDescription(description)
+  .SetCodeOnly(false)
+  .SetOptional(parameterIsOptional)
+  .SetExtraInfo(
       // For objects/behavior, the supplementary information
       // parameter is an object/behavior type...
       ((gd::ParameterMetadata::IsObject(type) ||
@@ -59,22 +59,16 @@ gd::ExpressionMetadata& ExpressionMetadata::AddParameter(
   // TODO: Assert against supplementaryInformation === "emsc" (when running with
   // Emscripten), and warn about a missing argument when calling addParameter.
 
-  parameters.push_back(info);
   return *this;
 }
 
-gd::ExpressionMetadata& ExpressionMetadata::AddCodeOnlyParameter(
-    const gd::String& type, const gd::String& supplementaryInformation) {
-  gd::ParameterMetadata info;
-  info.SetType(type);
-  info.codeOnly = true;
-  info.SetExtraInfo(supplementaryInformation);
-
-  parameters.push_back(info);
+gd::ExpressionMetadata &ExpressionMetadata::AddCodeOnlyParameter(
+    const gd::String &type, const gd::String &supplementaryInformation) {
+  parameters.AddNewParameter("").SetType(type).SetCodeOnly().SetExtraInfo(
+      supplementaryInformation);
   return *this;
 }
 
-
 gd::ExpressionMetadata& ExpressionMetadata::SetRequiresBaseObjectCapability(
     const gd::String& capability) {
   requiredBaseObjectCapability = capability;

Core/GDCore/Extensions/Metadata/ExpressionMetadata.h

@@ -193,8 +193,9 @@ class GD_CORE_API ExpressionMetadata : public gd::AbstractFunctionMetadata {
    * \see AddParameter
    */
   ExpressionMetadata &SetDefaultValue(const gd::String &defaultValue) override {
-    if (!parameters.empty())
-      parameters.back().SetDefaultValue(defaultValue);
+    if (parameters.GetParametersCount() > 0) {
+      parameters.GetInternalVector().back()->SetDefaultValue(defaultValue);
+    }
     return *this;
   };
 
@@ -206,8 +207,9 @@ class GD_CORE_API ExpressionMetadata : public gd::AbstractFunctionMetadata {
    */
   ExpressionMetadata &
   SetParameterLongDescription(const gd::String &longDescription) override {
-    if (!parameters.empty())
-      parameters.back().SetLongDescription(longDescription);
+    if (parameters.GetParametersCount() > 0) {
+      parameters.GetInternalVector().back()->SetLongDescription(longDescription);
+    }
     return *this;
   };
 
@@ -220,7 +222,9 @@ class GD_CORE_API ExpressionMetadata : public gd::AbstractFunctionMetadata {
    */
   ExpressionMetadata &SetParameterExtraInfo(
       const gd::String &extraInfo) override {
-    if (!parameters.empty()) parameters.back().SetExtraInfo(extraInfo);
+    if (parameters.GetParametersCount() > 0) {
+      parameters.GetInternalVector().back()->SetExtraInfo(extraInfo);
+    }
     return *this;
   }
 
@@ -248,19 +252,16 @@ class GD_CORE_API ExpressionMetadata : public gd::AbstractFunctionMetadata {
   const gd::String& GetGroup() const { return group; }
   const gd::String& GetSmallIconFilename() const { return smallIconFilename; }
   const gd::ParameterMetadata& GetParameter(std::size_t id) const {
-    return parameters[id];
+    return parameters.GetParameter(id);
   };
   gd::ParameterMetadata& GetParameter(std::size_t id) {
-    return parameters[id];
+    return parameters.GetParameter(id);
   };
-  std::size_t GetParametersCount() const { return parameters.size(); };
-  const std::vector<gd::ParameterMetadata>& GetParameters() const {
+  std::size_t GetParametersCount() const { return parameters.GetParametersCount(); };
+  const gd::ParameterMetadataContainer& GetParameters() const {
     return parameters;
   };
 
-  std::vector<gd::ParameterMetadata> parameters;
-
-  
   /**
    * \brief Set the function name which will be used when generating the code.
    * \param functionName the name of the function to call
@@ -368,6 +369,8 @@ class GD_CORE_API ExpressionMetadata : public gd::AbstractFunctionMetadata {
   bool isPrivate;
   gd::String requiredBaseObjectCapability;
   gd::String relevantContext;
+
+  gd::ParameterMetadataContainer parameters;
 };
 
 }  // namespace gd

Core/GDCore/Extensions/Metadata/InstructionMetadata.cpp

@@ -9,6 +9,7 @@
 
 #include "GDCore/CommonTools.h"
 #include "GDCore/Extensions/PlatformExtension.h"
+#include "GDCore/Project/ParameterMetadataContainer.h"
 #include "GDCore/Serialization/SerializerElement.h"
 #include "GDCore/Tools/Localization.h"
 #include "GDCore/Tools/Log.h"
@@ -77,7 +78,7 @@ InstructionMetadata& InstructionMetadata::AddParameter(
   // TODO: Assert against supplementaryInformation === "emsc" (when running with
   // Emscripten), and warn about a missing argument when calling addParameter.
 
-  parameters.push_back(info);
+  parameters.AddParameter(info);
   return *this;
 }
 
@@ -88,7 +89,7 @@ InstructionMetadata& InstructionMetadata::AddCodeOnlyParameter(
   info.codeOnly = true;
   info.SetExtraInfo(supplementaryInformation);
 
-  parameters.push_back(info);
+  parameters.AddParameter(info);
   return *this;
 }
 
@@ -102,7 +103,7 @@ InstructionMetadata& InstructionMetadata::UseStandardOperatorParameters(
     AddParameter(
         "yesorno",
         options.description.empty() ? _("New value") : options.description);
-    size_t valueParamIndex = parameters.size() - 1;
+    size_t valueParamIndex = parameters.GetParametersCount() - 1;
 
     if (isObjectInstruction || isBehaviorInstruction) {
       gd::String templateSentence = _("Set _PARAM0_ as <subject>: <value>");
@@ -127,8 +128,8 @@ InstructionMetadata& InstructionMetadata::UseStandardOperatorParameters(
                  options.description.empty() ? _("Value") : options.description,
                  options.typeExtraInfo);
 
-    size_t operatorParamIndex = parameters.size() - 2;
-    size_t valueParamIndex = parameters.size() - 1;
+    size_t operatorParamIndex = parameters.GetParametersCount() - 2;
+    size_t valueParamIndex = parameters.GetParametersCount() - 1;
 
     if (isObjectInstruction || isBehaviorInstruction) {
       gd::String templateSentence = _("Change <subject> of _PARAM0_: <operator> <value>");
@@ -181,8 +182,8 @@ InstructionMetadata::UseStandardRelationalOperatorParameters(
     AddParameter(type,
                  options.description.empty() ? _("Value to compare") : options.description,
                  options.typeExtraInfo);
-    size_t operatorParamIndex = parameters.size() - 2;
-    size_t valueParamIndex = parameters.size() - 1;
+    size_t operatorParamIndex = parameters.GetParametersCount() - 2;
+    size_t valueParamIndex = parameters.GetParametersCount() - 1;
 
     if (isObjectInstruction || isBehaviorInstruction) {
       gd::String templateSentence = _("<subject> of _PARAM0_ <operator> <value>");

Core/GDCore/Extensions/Metadata/InstructionMetadata.h

@@ -14,6 +14,7 @@
 #include <memory>
 
 #include "GDCore/Events/Instruction.h"
+#include "GDCore/Project/ParameterMetadataContainer.h"
 #include "GDCore/String.h"
 #include "ParameterMetadata.h"
 #include "ParameterOptions.h"
@@ -61,12 +62,12 @@ class GD_CORE_API InstructionMetadata : public gd::AbstractFunctionMetadata {
   const gd::String &GetDescription() const { return description; }
   const gd::String &GetSentence() const { return sentence; }
   const gd::String &GetGroup() const { return group; }
-  ParameterMetadata &GetParameter(size_t i) { return parameters[i]; }
+  ParameterMetadata &GetParameter(size_t i) { return parameters.GetParameter(i); }
   const ParameterMetadata &GetParameter(size_t i) const {
-    return parameters[i];
+    return parameters.GetParameter(i);
   }
-  size_t GetParametersCount() const { return parameters.size(); }
-  const std::vector<ParameterMetadata> &GetParameters() const {
+  size_t GetParametersCount() const { return parameters.GetParametersCount(); }
+  const ParameterMetadataContainer &GetParameters() const {
     return parameters;
   }
   const gd::String &GetIconFilename() const { return iconFilename; }
@@ -256,7 +257,9 @@ class GD_CORE_API InstructionMetadata : public gd::AbstractFunctionMetadata {
    * \see AddParameter
    */
   InstructionMetadata &SetDefaultValue(const gd::String &defaultValue_) override {
-    if (!parameters.empty()) parameters.back().SetDefaultValue(defaultValue_);
+    if (parameters.GetParametersCount() > 0) {
+      parameters.GetInternalVector().back()->SetDefaultValue(defaultValue_);
+    }
     return *this;
   };
 
@@ -268,8 +271,9 @@ class GD_CORE_API InstructionMetadata : public gd::AbstractFunctionMetadata {
    */
   InstructionMetadata &SetParameterLongDescription(
       const gd::String &longDescription) override {
-    if (!parameters.empty())
-      parameters.back().SetLongDescription(longDescription);
+    if (parameters.GetParametersCount() > 0) {
+      parameters.GetInternalVector().back()->SetLongDescription(longDescription);
+    }
     return *this;
   }
 
@@ -281,7 +285,9 @@ class GD_CORE_API InstructionMetadata : public gd::AbstractFunctionMetadata {
    * \see AddParameter
    */
   InstructionMetadata &SetParameterExtraInfo(const gd::String &extraInfo) override {
-    if (!parameters.empty()) parameters.back().SetExtraInfo(extraInfo);
+    if (parameters.GetParametersCount() > 0) {
+      parameters.GetInternalVector().back()->SetExtraInfo(extraInfo);
+    }
     return *this;
   }
 
@@ -456,6 +462,15 @@ 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
@@ -551,7 +566,7 @@ class GD_CORE_API InstructionMetadata : public gd::AbstractFunctionMetadata {
    */
   InstructionMetadata &GetCodeExtraInformation() { return *this; }
 
-  std::vector<ParameterMetadata> parameters;
+  ParameterMetadataContainer parameters;
 
  private:
   gd::String fullname;

Core/GDCore/Extensions/Metadata/InstructionOrExpressionContainerMetadata.h

@@ -174,6 +174,7 @@ public:
   virtual const gd::String &GetFullName() const = 0;
   virtual const gd::String &GetDescription() const = 0;
   virtual const gd::String &GetIconFilename() const = 0;
+  virtual bool IsPrivate() const = 0;
 
   /**
    * \brief Return a reference to a map containing the names of the actions

Core/GDCore/Extensions/Metadata/MetadataProvider.cpp

@@ -454,11 +454,12 @@ const gd::ParameterMetadata* MetadataProvider::GetFunctionCallParameterMetadata(
       // TODO use a badMetadata instead of a nullptr?
       const gd::ParameterMetadata* parameterMetadata = nullptr;
       while (metadataParameterIndex <
-             metadata.parameters.size()) {
-        if (!metadata.parameters[metadataParameterIndex]
+             metadata.GetParameters().GetParametersCount()) {
+        if (!metadata.GetParameters().GetParameter(metadataParameterIndex)
                  .IsCodeOnly()) {
           if (visibleParameterIndex == parameterIndex) {
-            parameterMetadata = &metadata.parameters[metadataParameterIndex];
+            parameterMetadata =
+                &metadata.GetParameters().GetParameter(metadataParameterIndex);
           }
           visibleParameterIndex++;
         }

Core/GDCore/Extensions/Metadata/MetadataProvider.h

@@ -288,8 +288,8 @@ class GD_CORE_API MetadataProvider {
   static EffectMetadata badEffectMetadata;
   static gd::InstructionMetadata badInstructionMetadata;
   static gd::ExpressionMetadata badExpressionMetadata;
-  int useless;  // Useless member to avoid emscripten "must have a positive
-                // integer typeid pointer" runtime error.
+  int useless = 0;  // Useless member to avoid emscripten "must have a positive
+                    // integer typeid pointer" runtime error.
 };
 
 }  // namespace gd

Core/GDCore/Extensions/Metadata/ObjectMetadata.cpp

@@ -46,30 +46,25 @@ ObjectMetadata::ObjectMetadata(const gd::String& extensionNamespace_,
                                const gd::String& fullname_,
                                const gd::String& description_,
                                const gd::String& icon24x24)
-    : ObjectMetadata(extensionNamespace_,
-                     name_,
-                     fullname_,
-                     description_,
-                     icon24x24,
-                     []() -> std::unique_ptr<gd::ObjectConfiguration> {
-      gd::LogFatalError(
-          "Error: Event-based objects don't have blueprint. "
-          "This method should not never be called.");
-      return nullptr;
-    }) {}
+    : name(name_),
+      iconFilename(icon24x24),
+      extensionNamespace(extensionNamespace_) {
+  SetFullName(gd::String(fullname_));
+  SetDescription(gd::String(description_));
+}
 
 ObjectMetadata::ObjectMetadata(const gd::String& extensionNamespace_,
                                const gd::String& name_,
                                const gd::String& fullname_,
                                const gd::String& description_,
                                const gd::String& icon24x24,
-                               CreateFunPtr createFunPtrP)
-    : name(name_),
-      iconFilename(icon24x24),
-      createFunPtr(createFunPtrP),
-      extensionNamespace(extensionNamespace_) {
-  SetFullName(gd::String(fullname_));
-  SetDescription(gd::String(description_));
+                               CreateFunPtr createFunPtr_)
+    : ObjectMetadata(extensionNamespace_,
+                     name_,
+                     fullname_,
+                     description_,
+                     icon24x24) {
+  createFunPtr = createFunPtr_;
 }
 
 gd::InstructionMetadata& ObjectMetadata::AddCondition(

Core/GDCore/Extensions/Metadata/ObjectMetadata.h

@@ -39,6 +39,8 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
   /**
    * \brief Construct an object metadata, using a "blueprint" object that will
    * be copied when a new object is requested.
+   *
+   * \note This is used for objects declared in JavaScript extensions.
    */
   ObjectMetadata(const gd::String& extensionNamespace_,
                  const gd::String& name_,
@@ -47,9 +49,9 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
                  const gd::String& icon24x24_,
                  std::shared_ptr<gd::ObjectConfiguration> blueprintObject_);
   /**
-   * \brief Construct an object metadata, without "blueprint" object
+   * \brief Construct an object metadata.
    *
-   * \note This is used by events based objects.
+   * \note This is used by events based objects ("custom objects").
    */
   ObjectMetadata(const gd::String& extensionNamespace_,
                  const gd::String& name_,
@@ -60,14 +62,17 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
   /**
    * \brief Construct an object metadata, with a function that will be called
    * to instantiate a new object.
+   *
+   * \note This is used for objects declared in C++ extensions.
    */
   ObjectMetadata(const gd::String& extensionNamespace_,
                  const gd::String& name_,
                  const gd::String& fullname_,
                  const gd::String& description_,
                  const gd::String& icon24x24_,
-                 CreateFunPtr createFunPtrP);
-  ObjectMetadata() : createFunPtr(NULL) {}
+                 CreateFunPtr createFunPtr_);
+
+  ObjectMetadata() {}
   virtual ~ObjectMetadata(){};
 
   /**
@@ -246,6 +251,11 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
     return *this;
   }
 
+  ObjectMetadata& ResetDefaultBehaviorsJustForTesting() {
+    defaultBehaviorTypes.clear();
+    return *this;
+  }
+
   const gd::String& GetName() const override { return name; }
   const gd::String& GetFullName() const override { return fullname; }
   const gd::String& GetCategoryFullName() const { return categoryFullName; }
@@ -295,6 +305,22 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
    */
   std::map<gd::String, gd::ExpressionMetadata>& GetAllStrExpressions() override { return strExpressionsInfos; };
 
+
+  /**
+   * Check if the behavior is private - it can't be used outside of its
+   * extension.
+   */
+  bool IsPrivate() const override { return isPrivate; }
+
+  /**
+   * Set that the behavior is private - it can't be used outside of its
+   * extension.
+   */
+  ObjectMetadata &SetPrivate() {
+    isPrivate = true;
+    return *this;
+  }
+
   /**
    * \brief Set the object to be hidden in the IDE.
    *
@@ -323,6 +349,15 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
    */
   bool IsRenderedIn3D() const { return isRenderedIn3D; }
 
+  ObjectMetadata &SetOpenFullEditorLabel(const gd::String& label) {
+    openFullEditorLabel = label;
+    return *this;
+  }
+
+  const gd::String& GetOpenFullEditorLabel() const {
+    return openFullEditorLabel;
+  }
+
   std::map<gd::String, gd::InstructionMetadata> conditionsInfos;
   std::map<gd::String, gd::InstructionMetadata> actionsInfos;
   std::map<gd::String, gd::ExpressionMetadata> expressionsInfos;
@@ -330,7 +365,7 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
 
   std::vector<gd::String> includeFiles;
   gd::String className;
-  CreateFunPtr createFunPtr;
+  CreateFunPtr createFunPtr = nullptr;
 
  private:
   gd::String extensionNamespace;
@@ -342,8 +377,10 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
   gd::String iconFilename;
   gd::String categoryFullName;
   std::set<gd::String> defaultBehaviorTypes;
+  bool isPrivate = false;
   bool hidden = false;
   bool isRenderedIn3D = false;
+  gd::String openFullEditorLabel;
 
   std::shared_ptr<gd::ObjectConfiguration>
       blueprintObject;  ///< The "blueprint" object to be copied when a new

Core/GDCore/Extensions/Metadata/ParameterMetadata.h

@@ -4,8 +4,8 @@
  * reserved. This project is released under the MIT License.
  */
 
-#ifndef PARAMETER_METADATA_H
-#define PARAMETER_METADATA_H
+#pragma once
+
 #include <map>
 #include <memory>
 
@@ -29,6 +29,12 @@ class GD_CORE_API ParameterMetadata {
   ParameterMetadata();
   virtual ~ParameterMetadata(){};
 
+  /**
+   * \brief Return a pointer to a new ParameterMetadata constructed from
+   * this one.
+   */
+  ParameterMetadata* Clone() const { return new ParameterMetadata(*this); };
+
   /**
    * \brief Return the metadata of the parameter type.
    */
@@ -248,5 +254,3 @@ class GD_CORE_API ParameterMetadata {
 };
 
 }  // namespace gd
-
-#endif  // PARAMETER_METADATA_H

Core/GDCore/Extensions/Metadata/ParameterMetadataTools.cpp

@@ -6,86 +6,157 @@
 #include "ParameterMetadataTools.h"
 
 #include "GDCore/Events/Expression.h"
+#include "GDCore/Events/Parsers/ExpressionParser2.h"
+#include "GDCore/Events/Parsers/ExpressionParser2NodePrinter.h"
 #include "GDCore/Project/Object.h"
 #include "GDCore/Project/ObjectsContainer.h"
 #include "GDCore/Project/ObjectsContainersList.h"
+#include "GDCore/Project/ParameterMetadataContainer.h"
 #include "GDCore/Project/Project.h"
 #include "GDCore/String.h"
 #include "InstructionMetadata.h"
-#include "GDCore/Events/Parsers/ExpressionParser2.h"
-#include "GDCore/Events/Parsers/ExpressionParser2NodePrinter.h"
 
 namespace gd {
 const ParameterMetadata ParameterMetadataTools::badParameterMetadata;
 
 void ParameterMetadataTools::ParametersToObjectsContainer(
     const gd::Project& project,
-    const std::vector<gd::ParameterMetadata>& parameters,
+    const ParameterMetadataContainer& parameters,
     gd::ObjectsContainer& outputObjectsContainer) {
-  outputObjectsContainer.GetObjects().clear();
+  // Keep track of all objects and their behaviors names, so we can remove
+  // those who are in the container but not in the parameters anymore.
+  std::set<gd::String> allObjectNames;
+  std::map<gd::String, std::set<gd::String>> allObjectNonDefaultBehaviorNames;
 
   gd::String lastObjectName;
-  for (std::size_t i = 0; i < parameters.size(); ++i) {
-    const auto& parameter = parameters[i];
+  for (std::size_t i = 0; i < parameters.GetParametersCount(); ++i) {
+    const auto& parameter = parameters.GetParameter(i);
     if (parameter.GetName().empty()) continue;
 
-    if (gd::ParameterMetadata::IsObject(parameter.GetType())) {
-      outputObjectsContainer.InsertNewObject(
-          project,
-          parameter.GetExtraInfo(),
-          parameter.GetName(),
-          outputObjectsContainer.GetObjectsCount());
+    auto &valueTypeMetadata = parameter.GetValueTypeMetadata();
+    if (valueTypeMetadata.IsObject()) {
+      const gd::String& objectName = parameter.GetName();
+      const gd::String& objectType = parameter.GetExtraInfo();
+      allObjectNames.insert(objectName);
+
+      // Check if we can keep the existing object.
+      if (outputObjectsContainer.HasObjectNamed(objectName)) {
+        const gd::Object& object = outputObjectsContainer.GetObject(objectName);
+
+        if (object.GetType() != objectType) {
+          // Object type has changed, remove it so it is re-created.
+          outputObjectsContainer.RemoveObject(objectName);
+        }
+      }
+
+      if (outputObjectsContainer.HasObjectNamed(objectName)) {
+        // Keep the existing object, ensure the default behaviors
+        // are all present (and no more than required by the object type).
+        // Non default behaviors coming from parameters will be added or removed later.
+        project.EnsureObjectDefaultBehaviors(outputObjectsContainer.GetObject(objectName));
+      } else {
+        // Create a new object (and its default behaviors) if needed.
+        outputObjectsContainer.InsertNewObject(
+            project,
+            objectType,
+            objectName,
+            outputObjectsContainer.GetObjectsCount());
+      }
 
       // Memorize the last object name. By convention, parameters that require
       // an object (mainly, "objectvar" and "behavior") should be placed after
       // the object in the list of parameters (if possible, just after).
       // Search "lastObjectName" in the codebase for other place where this
       // convention is enforced.
-      lastObjectName = parameter.GetName();
-    } else if (gd::ParameterMetadata::IsBehavior(parameter.GetType())) {
+      lastObjectName = objectName;
+    } else if (valueTypeMetadata.IsBehavior()) {
       if (!lastObjectName.empty()) {
         if (outputObjectsContainer.HasObjectNamed(lastObjectName)) {
-          const gd::Object& object =
-              outputObjectsContainer.GetObject(lastObjectName);
-          gd::String behaviorName = parameter.GetName();
+          const gd::String& behaviorName = parameter.GetName();
+          const gd::String& behaviorType = parameter.GetExtraInfo();
+
+          gd::Object& object = outputObjectsContainer.GetObject(lastObjectName);
+          allObjectNonDefaultBehaviorNames[lastObjectName].insert(behaviorName);
+
+          // Check if we can keep the existing behavior.
+          if (object.HasBehaviorNamed(behaviorName)) {
+            if (object.GetBehavior(behaviorName).GetTypeName() !=
+                behaviorType) {
+              // Behavior type has changed, remove it so it is re-created.
+              object.RemoveBehavior(behaviorName);
+            }
+          }
 
           if (!object.HasBehaviorNamed(behaviorName)) {
-            outputObjectsContainer.GetObject(lastObjectName)
-                .AddNewBehavior(
-                    project, parameter.GetExtraInfo(), behaviorName);
+            object.AddNewBehavior(
+                project, parameter.GetExtraInfo(), behaviorName);
           }
         }
       }
     }
   }
+
+  // Remove objects that are not in the parameters anymore.
+  std::set<gd::String> objectNamesInContainer =
+      outputObjectsContainer.GetAllObjectNames();
+  for (const auto& objectName : objectNamesInContainer) {
+    if (allObjectNames.find(objectName) == allObjectNames.end()) {
+      outputObjectsContainer.RemoveObject(objectName);
+    }
+  }
+
+  // Remove behaviors of objects that are not in the parameters anymore.
+  for (const auto& objectName : allObjectNames) {
+    if (!outputObjectsContainer.HasObjectNamed(objectName)) {
+      // Should not happen.
+      continue;
+    }
+
+    auto& object = outputObjectsContainer.GetObject(objectName);
+    const auto& allBehaviorNames = allObjectNonDefaultBehaviorNames[objectName];
+    for (const auto& behaviorName : object.GetAllBehaviorNames()) {
+      if (object.GetBehavior(behaviorName).IsDefaultBehavior()) {
+        // Default behaviors are already ensured to be all present
+        // (and no more than required by the object type).
+        continue;
+      }
+
+      if (allBehaviorNames.find(behaviorName) == allBehaviorNames.end()) {
+        object.RemoveBehavior(behaviorName);
+      }
+    }
+  }
 }
 
 void ParameterMetadataTools::ForEachParameterMatchingSearch(
-    const std::vector<const std::vector<gd::ParameterMetadata>*>&
+    const std::vector<const ParameterMetadataContainer*>&
         parametersVectorsList,
     const gd::String& search,
     std::function<void(const gd::ParameterMetadata&)> cb) {
   for (auto it = parametersVectorsList.rbegin();
        it != parametersVectorsList.rend();
        ++it) {
-    const std::vector<gd::ParameterMetadata>* parametersVector = *it;
+    const ParameterMetadataContainer* parametersVector = *it;
 
-    for (const auto& parameterMetadata: *parametersVector) {
-      if (parameterMetadata.GetName().FindCaseInsensitive(search) != gd::String::npos) cb(parameterMetadata);
+    for (const auto &parameterMetadata :
+         parametersVector->GetInternalVector()) {
+      if (parameterMetadata->GetName().FindCaseInsensitive(search) !=
+          gd::String::npos)
+        cb(*parameterMetadata);
     }
   }
 }
 
 bool ParameterMetadataTools::Has(
-      const std::vector<const std::vector<gd::ParameterMetadata>*>& parametersVectorsList,
+      const std::vector<const ParameterMetadataContainer*>& parametersVectorsList,
       const gd::String& parameterName) {
   for (auto it = parametersVectorsList.rbegin();
        it != parametersVectorsList.rend();
        ++it) {
-    const std::vector<gd::ParameterMetadata>* parametersVector = *it;
+    const ParameterMetadataContainer* parametersVector = *it;
 
-    for (const auto& parameterMetadata: *parametersVector) {
-      if (parameterMetadata.GetName() == parameterName) return true;
+    for (const auto& parameterMetadata: parametersVector->GetInternalVector()) {
+      if (parameterMetadata->GetName() == parameterName) return true;
     }
   }
 
@@ -93,16 +164,18 @@ bool ParameterMetadataTools::Has(
 }
 
 const gd::ParameterMetadata& ParameterMetadataTools::Get(
-    const std::vector<const std::vector<gd::ParameterMetadata>*>&
+    const std::vector<const ParameterMetadataContainer*>&
         parametersVectorsList,
     const gd::String& parameterName) {
   for (auto it = parametersVectorsList.rbegin();
        it != parametersVectorsList.rend();
        ++it) {
-    const std::vector<gd::ParameterMetadata>* parametersVector = *it;
+    const ParameterMetadataContainer* parametersVector = *it;
 
-    for (const auto& parameterMetadata: *parametersVector) {
-      if (parameterMetadata.GetName() == parameterName) return parameterMetadata;
+    for (const auto &parameterMetadata :
+         parametersVector->GetInternalVector()) {
+      if (parameterMetadata->GetName() == parameterName)
+        return *parameterMetadata;
     }
   }
 
@@ -111,7 +184,7 @@ const gd::ParameterMetadata& ParameterMetadataTools::Get(
 
 void ParameterMetadataTools::IterateOverParameters(
     const std::vector<gd::Expression>& parameters,
-    const std::vector<gd::ParameterMetadata>& parametersMetadata,
+    const ParameterMetadataContainer& parametersMetadata,
     std::function<void(const gd::ParameterMetadata& parameterMetadata,
                        const gd::Expression& parameterValue,
                        const gd::String& lastObjectName)> fn) {
@@ -128,15 +201,17 @@ void ParameterMetadataTools::IterateOverParameters(
 
 void ParameterMetadataTools::IterateOverParametersWithIndex(
     const std::vector<gd::Expression>& parameters,
-    const std::vector<gd::ParameterMetadata>& parametersMetadata,
+    const ParameterMetadataContainer& parametersMetadata,
     std::function<void(const gd::ParameterMetadata& parameterMetadata,
                        const gd::Expression& parameterValue,
                        size_t parameterIndex,
                        const gd::String& lastObjectName)> fn) {
   gd::String lastObjectName = "";
-  for (std::size_t pNb = 0; pNb < parametersMetadata.size(); ++pNb) {
-    const gd::ParameterMetadata& parameterMetadata = parametersMetadata[pNb];
-    const gd::Expression& parameterValue =
+  for (std::size_t pNb = 0; pNb < parametersMetadata.GetParametersCount();
+       ++pNb) {
+    const gd::ParameterMetadata &parameterMetadata =
+        parametersMetadata.GetParameter(pNb);
+    const gd::Expression &parameterValue =
         pNb < parameters.size() ? parameters[pNb].GetPlainString() : "";
     const gd::Expression& parameterValueOrDefault =
         parameterValue.GetPlainString().empty() && parameterMetadata.IsOptional()
@@ -179,10 +254,10 @@ void ParameterMetadataTools::IterateOverParametersWithIndex(
 
   size_t parameterIndex = 0;
   for (size_t metadataIndex = (isObjectFunction ? 1 : 0);
-       metadataIndex < metadata.parameters.size() &&
+       metadataIndex < metadata.GetParameters().GetParametersCount() &&
        parameterIndex < node.parameters.size();
        ++metadataIndex) {
-    auto &parameterMetadata = metadata.parameters[metadataIndex];
+    auto &parameterMetadata = metadata.GetParameters().GetParameter(metadataIndex);
     if (parameterMetadata.IsCodeOnly()) {
       continue;
     }
@@ -204,16 +279,17 @@ void ParameterMetadataTools::IterateOverParametersWithIndex(
 }
 
 size_t ParameterMetadataTools::GetObjectParameterIndexFor(
-    const std::vector<gd::ParameterMetadata>& parametersMetadata,
+    const ParameterMetadataContainer& parametersMetadata,
     size_t parameterIndex) {
   // By convention, parameters that require
   // an object (mainly, "objectvar" and "behavior") should be placed after
   // the object in the list of parameters (if possible, just after).
   // Search "lastObjectName" in the codebase for other place where this
   // convention is enforced.
-  for (std::size_t pNb = parameterIndex; pNb < parametersMetadata.size();
-       pNb--) {
-    if (gd::ParameterMetadata::IsObject(parametersMetadata[pNb].GetType())) {
+  for (std::size_t pNb = parameterIndex;
+       pNb < parametersMetadata.GetParametersCount(); pNb--) {
+    if (gd::ParameterMetadata::IsObject(
+            parametersMetadata.GetParameter(pNb).GetType())) {
       return pNb;
     }
   }

Core/GDCore/Extensions/Metadata/ParameterMetadataTools.h

@@ -15,6 +15,7 @@ class ObjectsContainer;
 class ObjectsContainersList;
 class ParameterMetadata;
 class Expression;
+class ParameterMetadataContainer;
 struct FunctionCallNode;
 struct ExpressionNode;
 }  // namespace gd
@@ -24,20 +25,20 @@ class GD_CORE_API ParameterMetadataTools {
  public:
   static void ParametersToObjectsContainer(
       const gd::Project& project,
-      const std::vector<gd::ParameterMetadata>& parameters,
+      const ParameterMetadataContainer& parameters,
       gd::ObjectsContainer& outputObjectsContainer);
 
   static void ForEachParameterMatchingSearch(
-      const std::vector<const std::vector<gd::ParameterMetadata>*>& parametersVectorsList,
+      const std::vector<const ParameterMetadataContainer*>& parametersVectorsList,
       const gd::String& search,
       std::function<void(const gd::ParameterMetadata&)> cb);
 
   static bool Has(
-      const std::vector<const std::vector<gd::ParameterMetadata>*>& parametersVectorsList,
+      const std::vector<const ParameterMetadataContainer*>& parametersVectorsList,
       const gd::String& parameterName);
 
   static const gd::ParameterMetadata& Get(
-      const std::vector<const std::vector<gd::ParameterMetadata>*>& parametersVectorsList,
+      const std::vector<const ParameterMetadataContainer*>& parametersVectorsList,
       const gd::String& parameterName);
 
   /**
@@ -47,7 +48,7 @@ class GD_CORE_API ParameterMetadataTools {
    */
   static void IterateOverParameters(
       const std::vector<gd::Expression>& parameters,
-      const std::vector<gd::ParameterMetadata>& parametersMetadata,
+      const ParameterMetadataContainer& parametersMetadata,
       std::function<void(const gd::ParameterMetadata& parameterMetadata,
                          const gd::Expression& parameterValue,
                          const gd::String& lastObjectName)> fn);
@@ -59,7 +60,7 @@ class GD_CORE_API ParameterMetadataTools {
    */
   static void IterateOverParametersWithIndex(
       const std::vector<gd::Expression>& parameters,
-      const std::vector<gd::ParameterMetadata>& parametersMetadata,
+      const ParameterMetadataContainer& parametersMetadata,
       std::function<void(const gd::ParameterMetadata& parameterMetadata,
                          const gd::Expression& parameterValue,
                          size_t parameterIndex,
@@ -84,7 +85,7 @@ class GD_CORE_API ParameterMetadataTools {
    * it's linked to.
    */
   static size_t GetObjectParameterIndexFor(
-      const std::vector<gd::ParameterMetadata>& parametersMetadata,
+      const ParameterMetadataContainer& parametersMetadata,
       size_t parameterIndex);
 
 private:

Core/GDCore/Extensions/Metadata/SourceFileMetadata.h

@@ -0,0 +1,56 @@
+/*
+ * 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/String.h"
+#include "GDCore/Serialization/SerializerElement.h"
+
+namespace gd {
+/**
+ * \brief Contains information about a source file that must be included
+ * when an extension is used.
+ */
+class GD_CORE_API SourceFileMetadata {
+ public:
+  /**
+   * Construct a new dependency metadata, though you probably want to call
+   * `AddSourceFile` on gd::PlatformExtension.
+   *
+   * \see gd::PlatformExtension
+   */
+  SourceFileMetadata() {};
+
+  SourceFileMetadata& SetResourceName(const gd::String& resourceName_) {
+    resourceName = resourceName_;
+    return *this;
+  };
+
+  SourceFileMetadata& SetIncludePosition(const gd::String& includePosition_) {
+    includePosition = includePosition_;
+    return *this;
+  };
+
+  const gd::String& GetResourceName() const { return resourceName; };
+
+  gd::String& GetResourceName() { return resourceName; };
+
+  const gd::String& GetIncludePosition() const { return includePosition; };
+
+  void SerializeTo(SerializerElement& element) const {
+    element.AddChild("resourceName").SetStringValue(resourceName);
+    element.AddChild("includePosition").SetStringValue(includePosition);
+  }
+
+  void UnserializeFrom(const SerializerElement& element) {
+    resourceName = element.GetStringAttribute("resourceName");
+    includePosition = element.GetStringAttribute("includePosition", "last");
+  }
+
+ private:
+  gd::String resourceName;  ///< The name of the resource in the project.
+  gd::String includePosition = "last";  ///< "first" or "last".
+};
+
+}  // namespace gd

Core/GDCore/Extensions/Metadata/ValueTypeMetadata.cpp

@@ -53,27 +53,34 @@ const gd::String &ValueTypeMetadata::GetExpressionPrimitiveValueType(
 
 const gd::String &
 ValueTypeMetadata::GetPrimitiveValueType(const gd::String &parameterType) {
-  if (parameterType == "variable" ||
-      gd::ValueTypeMetadata::IsTypeExpression("variable", parameterType)) {
-    return ValueTypeMetadata::variableType;
+  if (parameterType == "number" ||
+      gd::ValueTypeMetadata::IsTypeValue("number", parameterType)) {
+    return ValueTypeMetadata::numberType;
   }
-  if (parameterType == "boolean" || parameterType == "yesorno" ||
-      parameterType == "trueorfalse") {
-    return ValueTypeMetadata::booleanType;
-  }
-  // These 2 types are not strings from the code generator point of view,
-  // but it is for event-based extensions.
-  if (parameterType == "key" || parameterType == "mouse") {
+  if (parameterType == "string" ||
+      gd::ValueTypeMetadata::IsTypeValue("string", parameterType)) {
     return ValueTypeMetadata::stringType;
   }
-  return GetExpressionPrimitiveValueType(parameterType);
+  if (parameterType == "variable" ||
+      gd::ValueTypeMetadata::IsTypeValue("variable", parameterType)) {
+    return ValueTypeMetadata::variableType;
+  }
+  if (parameterType == "boolean" ||
+      gd::ValueTypeMetadata::IsTypeValue("boolean", parameterType)) {
+    return ValueTypeMetadata::booleanType;
+  }
+  return parameterType;
 }
 
 const gd::String ValueTypeMetadata::numberValueType = "number";
 const gd::String ValueTypeMetadata::booleanValueType = "boolean";
+const gd::String ValueTypeMetadata::stringValueType = "string";
 const gd::String ValueTypeMetadata::colorValueType = "color";
 const gd::String ValueTypeMetadata::choiceValueType = "stringWithSelector";
-const gd::String ValueTypeMetadata::stringValueType = "string";
+const gd::String ValueTypeMetadata::behaviorValueType = "behavior";
+const gd::String ValueTypeMetadata::leaderboardIdValueType = "leaderboardId";
+const gd::String ValueTypeMetadata::objectAnimationNameValueType = "objectAnimationName";
+const gd::String ValueTypeMetadata::keyboardKeyValueType = "keyboardKey";
 
 const gd::String &ValueTypeMetadata::ConvertPropertyTypeToValueType(
     const gd::String &propertyType) {
@@ -85,8 +92,16 @@ const gd::String &ValueTypeMetadata::ConvertPropertyTypeToValueType(
     return colorValueType;
   } else if (propertyType == "Choice") {
     return choiceValueType;
+  } else if (propertyType == "Behavior") {
+    return behaviorValueType;
+  } else if (propertyType == "LeaderboardId") {
+    return leaderboardIdValueType;
+  } else if (propertyType == "ObjectAnimationName") {
+    return objectAnimationNameValueType;
+  } else if (propertyType == "KeyboardKey") {
+    return keyboardKeyValueType;
   }
-  // For "String" or default
+  // For "String", "Resource", "MultilineString" or default
   return stringValueType;
 };
 

Core/GDCore/Extensions/Metadata/ValueTypeMetadata.h

@@ -111,31 +111,54 @@ class GD_CORE_API ValueTypeMetadata {
    * given type.
    */
   bool IsNumber() const {
-    return gd::ValueTypeMetadata::IsTypeExpression("number", name);
+    return gd::ValueTypeMetadata::IsTypeValue("number", name);
   }
 
   /**
    * \brief Return true if the type is a string.
    */
   bool IsString() const {
-    return gd::ValueTypeMetadata::IsTypeExpression("string", name);
+    return gd::ValueTypeMetadata::IsTypeValue("string", name);
   }
 
   /**
    * \brief Return true if the type is a boolean.
    */
   bool IsBoolean() const {
-    return gd::ValueTypeMetadata::IsTypeExpression("boolean", name);
+    return gd::ValueTypeMetadata::IsTypeValue("boolean", name);
   }
 
   /**
-   * \brief Return true if the type of the parameter is a number.
+   * \brief Return true if the type of the parameter is a variable.
    * \note If you had a new type of parameter, also add it in the IDE (
    * see EventsFunctionParametersEditor, ParameterRenderingService
    * and ExpressionAutocompletion) and in the EventsCodeGenerator.
    */
   bool IsVariable() const {
-    return gd::ValueTypeMetadata::IsTypeExpression("variable", name);
+    return gd::ValueTypeMetadata::IsVariable(name);
+  }
+
+  /**
+   * \brief Return true if the type of the parameter is a variable.
+   * \note If you had a new type of parameter, also add it in the IDE (
+   * see EventsFunctionParametersEditor, ParameterRenderingService
+   * and ExpressionAutocompletion) and in the EventsCodeGenerator.
+   */
+  static bool IsVariable(const gd::String &type) {
+    return gd::ValueTypeMetadata::GetPrimitiveValueType(type) == "variable";
+  }
+
+  /**
+   * \brief Return true if the type of the parameter is a variable and not a
+   * property or a parameter.
+   */
+  bool IsVariableOnly() const {
+      return
+          // Any variable.
+          name == "variable" ||
+          // Old, "pre-scoped" variables:
+          name == "objectvar" || name == "globalvar" ||
+          name == "scenevar";
   }
 
   /**
@@ -175,7 +198,9 @@ class GD_CORE_API ValueTypeMetadata {
   }
 
   /**
-   * \brief Return true if the type is an expression of the given type.
+   * \brief Return true if the type is an expression of the given type from the
+   * caller point of view.
+   *
    * \note If you are adding a new type of parameter, also add it in the IDE (
    * see EventsFunctionParametersEditor, ParameterRenderingService
    * and ExpressionAutocompletion) and in the EventsCodeGenerator.
@@ -186,6 +211,7 @@ class GD_CORE_API ValueTypeMetadata {
       return parameterType == "number" || parameterType == "expression" ||
              parameterType == "camera" || parameterType == "forceMultiplier";
     } else if (type == "string") {
+      // "key" and "mouse" are not mapped her, see GetPrimitiveValueType.
       return parameterType == "string" || parameterType == "layer" ||
              parameterType == "color" || parameterType == "file" ||
              parameterType == "stringWithSelector" ||
@@ -199,19 +225,24 @@ class GD_CORE_API ValueTypeMetadata {
              parameterType == "functionParameterName" ||
              parameterType == "externalLayoutName" ||
              parameterType == "leaderboardId" ||
+             parameterType == "keyboardKey" ||
+             parameterType == "mouseButton" ||
              parameterType == "identifier";
     } else if (type == "boolean") {
       return parameterType == "yesorno" || parameterType == "trueorfalse";
     } else if (type == "variable") {
       return
-             parameterType == "variable" || // Any variable.
-             // Old, "pre-scoped" variables:
-             parameterType == "objectvar" || parameterType == "globalvar" ||
-             parameterType == "scenevar";
+          // Any variable.
+          parameterType == "variable" ||
+          parameterType == "variableOrProperty" ||
+          parameterType == "variableOrPropertyOrParameter" ||
+          // Old, "pre-scoped" variables:
+          parameterType == "objectvar" || parameterType == "globalvar" ||
+          parameterType == "scenevar";
     } else if (type == "resource") {
       return parameterType == "fontResource" ||
-             parameterType == "soundfile" ||
-             parameterType == "musicfile" ||
+             parameterType == "audioResource" ||
+             parameterType == "videoResource" ||
              parameterType == "bitmapFontResource" ||
              parameterType == "imageResource" ||
              parameterType == "jsonResource" ||
@@ -219,7 +250,30 @@ class GD_CORE_API ValueTypeMetadata {
              parameterType == "tilesetResource" ||
              parameterType == "model3DResource" ||
              parameterType == "atlasResource" ||
-             parameterType == "spineResource";
+             parameterType == "spineResource" ||
+             // Deprecated, old parameter types:
+             parameterType == "soundfile" ||
+             parameterType == "musicfile";
+    }
+    return false;
+  }
+
+  /**
+   * \brief Return true if the type is a value of the given primitive type from
+   * the function events point of view
+   */
+  static bool IsTypeValue(const gd::String &type,
+                           const gd::String &parameterType) {
+    if (gd::ValueTypeMetadata::IsTypeExpression(type, parameterType)) {
+      return true;
+    }
+    // These 2 parameter types are not strings from the outside of a function as
+    // the generator add quote around a text, but from the events inside of the
+    // function the parameter is a string.
+    //
+    // See EventsCodeGenerator::GenerateParameterCodes
+    if (type == "string") {
+      return parameterType == "key" || parameterType == "mouse";
     }
     return false;
   }
@@ -275,9 +329,13 @@ class GD_CORE_API ValueTypeMetadata {
 
   static const gd::String numberValueType;
   static const gd::String booleanValueType;
+  static const gd::String stringValueType;
   static const gd::String colorValueType;
   static const gd::String choiceValueType;
-  static const gd::String stringValueType;
+  static const gd::String behaviorValueType;
+  static const gd::String leaderboardIdValueType;
+  static const gd::String objectAnimationNameValueType;
+  static const gd::String keyboardKeyValueType;
 };
 
 }  // namespace gd

Core/GDCore/Extensions/Platform.cpp

@@ -38,12 +38,14 @@ bool Platform::AddExtension(std::shared_ptr<gd::PlatformExtension> extension) {
 
   extensionsLoaded.push_back(extension);
 
-  // Load all creation/destruction functions for objects provided by the
-  // extension
+  // Load all creation functions for objects provided by the
+  // extension.
   vector<gd::String> objectsTypes = extension->GetExtensionObjectsTypes();
   for (std::size_t i = 0; i < objectsTypes.size(); ++i) {
-    creationFunctionTable[objectsTypes[i]] =
-        extension->GetObjectCreationFunctionPtr(objectsTypes[i]);
+    CreateFunPtr createFunPtr = extension->GetObjectCreationFunctionPtr(objectsTypes[i]);
+    if (createFunPtr != nullptr) {
+      creationFunctionTable[objectsTypes[i]] = createFunPtr;
+    }
   }
 
   for (const auto& it :
@@ -62,7 +64,9 @@ void Platform::RemoveExtension(const gd::String& name) {
     if (extension->GetName() == name) {
       vector<gd::String> objectsTypes = extension->GetExtensionObjectsTypes();
       for (std::size_t i = 0; i < objectsTypes.size(); ++i) {
-        creationFunctionTable.erase(objectsTypes[i]);
+        if (creationFunctionTable.find(objectsTypes[i]) != creationFunctionTable.end()) {
+          creationFunctionTable.erase(objectsTypes[i]);
+        }
       }
     }
   }
@@ -96,11 +100,11 @@ std::shared_ptr<gd::PlatformExtension> Platform::GetExtension(
 std::unique_ptr<gd::ObjectConfiguration> Platform::CreateObjectConfiguration(
     gd::String type) const {
   if (creationFunctionTable.find(type) == creationFunctionTable.end()) {
-    gd::LogWarning("Tried to create an object with an unknown type: " + type
+    gd::LogWarning("Tried to create an object configuration with an unknown type: " + type
               + " for platform " + GetName() + "!");
     type = "";
     if (creationFunctionTable.find("") == creationFunctionTable.end()) {
-      gd::LogError("Unable to create a Base object!");
+      gd::LogFatalError("Unable to create a base object configuration!");
       return nullptr;
     }
   }

Core/GDCore/Extensions/PlatformExtension.cpp

@@ -215,6 +215,11 @@ gd::DependencyMetadata& PlatformExtension::AddDependency() {
   return extensionDependenciesMetadata.back();
 }
 
+gd::SourceFileMetadata& PlatformExtension::AddSourceFile() {
+  extensionSourceFilesMetadata.push_back(SourceFileMetadata());
+  return extensionSourceFilesMetadata.back();
+}
+
 gd::ObjectMetadata& PlatformExtension::AddObject(
     const gd::String& name,
     const gd::String& fullname,
@@ -463,10 +468,22 @@ PlatformExtension::GetAllStrExpressions() {
   return strExpressionsInfos;
 }
 
+const std::vector<gd::DependencyMetadata>& PlatformExtension::GetAllDependencies() const {
+  return extensionDependenciesMetadata;
+}
+
 std::vector<gd::DependencyMetadata>& PlatformExtension::GetAllDependencies() {
   return extensionDependenciesMetadata;
 }
 
+const std::vector<gd::SourceFileMetadata>& PlatformExtension::GetAllSourceFiles() const {
+  return extensionSourceFilesMetadata;
+}
+
+std::vector<gd::SourceFileMetadata>& PlatformExtension::GetAllSourceFiles() {
+  return extensionSourceFilesMetadata;
+}
+
 std::map<gd::String, gd::EventMetadata>& PlatformExtension::GetAllEvents() {
   return eventsInfos;
 }
@@ -808,6 +825,24 @@ gd::String PlatformExtension::GetObjectFullType(const gd::String &extensionName,
   return extensionName + separator + objectName;
 }
 
+gd::String PlatformExtension::GetExtensionFromFullObjectType(const gd::String& type) {
+  const auto separatorIndex =
+      type.find(PlatformExtension::GetNamespaceSeparator());
+  if (separatorIndex == std::string::npos) {
+    return "";
+  }
+  return type.substr(0, separatorIndex);
+}
+
+gd::String PlatformExtension::GetObjectNameFromFullObjectType(const gd::String& type) {
+  const auto separatorIndex =
+      type.find(PlatformExtension::GetNamespaceSeparator());
+  if (separatorIndex == std::string::npos) {
+    return "";
+  }
+  return type.substr(separatorIndex + 2);
+}
+
 PlatformExtension::PlatformExtension()
     : deprecated(false), category(_("General")) {}
 

Core/GDCore/Extensions/PlatformExtension.h

@@ -13,6 +13,7 @@
 #include "GDCore/CommonTools.h"
 #include "GDCore/Extensions/Metadata/BehaviorMetadata.h"
 #include "GDCore/Extensions/Metadata/DependencyMetadata.h"
+#include "GDCore/Extensions/Metadata/SourceFileMetadata.h"
 #include "GDCore/Extensions/Metadata/EffectMetadata.h"
 #include "GDCore/Extensions/Metadata/EventMetadata.h"
 #include "GDCore/Extensions/Metadata/InstructionOrExpressionGroupMetadata.h"
@@ -40,8 +41,7 @@ class Object;
 class ObjectConfiguration;
 }  // namespace gd
 
-typedef std::function<std::unique_ptr<gd::ObjectConfiguration>()>
-    CreateFunPtr;
+typedef std::function<std::unique_ptr<gd::ObjectConfiguration>()> CreateFunPtr;
 
 namespace gd {
 
@@ -51,25 +51,25 @@ namespace gd {
  */
 class GD_CORE_API CompilationInfo {
  public:
-  CompilationInfo() : informationCompleted(false){};
-  virtual ~CompilationInfo(){};
+  CompilationInfo() {};
+  virtual ~CompilationInfo() {};
 
-  bool informationCompleted;
+  bool informationCompleted = false;
 
-  bool runtimeOnly;  ///< True if the extension was compiled for a runtime use
-                     ///< only
+  bool runtimeOnly = false;  ///< True if the extension was compiled for a
+                             ///< runtime use only
 
 #if defined(__GNUC__)
-  int gccMajorVersion;
-  int gccMinorVersion;
-  int gccPatchLevel;
+  int gccMajorVersion = 0;
+  int gccMinorVersion = 0;
+  int gccPatchLevel = 0;
 #endif
 
-  int sfmlMajorVersion;
-  int sfmlMinorVersion;
+  int sfmlMajorVersion = 0;
+  int sfmlMinorVersion = 0;
 
   gd::String gdCoreVersion;
-  int sizeOfpInt;
+  int sizeOfpInt = 0;
 };
 
 struct GD_CORE_API DuplicatedInstructionOptions {
@@ -215,6 +215,7 @@ class GD_CORE_API PlatformExtension {
       const gd::String& icon);
 
   gd::DependencyMetadata& AddDependency();
+  gd::SourceFileMetadata& AddSourceFile();
 
   /**
    * \brief Declare a new object as being part of the extension.
@@ -239,11 +240,12 @@ class GD_CORE_API PlatformExtension {
    * \param instance The "blueprint" object to be copied when a new object is
    asked for.
    */
-  gd::ObjectMetadata& AddObject(const gd::String& name_,
-                                const gd::String& fullname_,
-                                const gd::String& description_,
-                                const gd::String& icon_,
-                                std::shared_ptr<gd::ObjectConfiguration> instance);
+  gd::ObjectMetadata& AddObject(
+      const gd::String& name_,
+      const gd::String& fullname_,
+      const gd::String& description_,
+      const gd::String& icon_,
+      std::shared_ptr<gd::ObjectConfiguration> instance);
 
   /**
    * \brief Declare a new events based object as being part of the extension.
@@ -253,11 +255,10 @@ class GD_CORE_API PlatformExtension {
    * \param description The user friendly description of the object
    * \param icon The icon of the object.
    */
-  gd::ObjectMetadata& AddEventsBasedObject(
-      const gd::String& name_,
-      const gd::String& fullname_,
-      const gd::String& description_,
-      const gd::String& icon_);
+  gd::ObjectMetadata& AddEventsBasedObject(const gd::String& name_,
+                                           const gd::String& fullname_,
+                                           const gd::String& description_,
+                                           const gd::String& icon_);
 
   /**
    * \brief Declare a new behavior as being part of the extension.
@@ -420,8 +421,7 @@ class GD_CORE_API PlatformExtension {
   PlatformExtension& SetTags(const gd::String& csvTags) {
     tags.clear();
     tags = csvTags.Split(',');
-    for (size_t i = 0; i < tags.size(); i++)
-    {
+    for (size_t i = 0; i < tags.size(); i++) {
       tags[i] = tags[i].Trim().LowerCase();
     }
     return *this;
@@ -554,6 +554,24 @@ class GD_CORE_API PlatformExtension {
    */
   std::vector<gd::DependencyMetadata>& GetAllDependencies();
 
+  /**
+   * \brief Return a reference to a vector containing the metadata of all the
+   * dependencies of the extension.
+   */
+  const std::vector<gd::DependencyMetadata>& GetAllDependencies() const;
+
+  /**
+   * \brief Return a reference to a vector containing the metadata of all the
+   * dependencies of the extension.
+   */
+  std::vector<gd::SourceFileMetadata>& GetAllSourceFiles();
+
+  /**
+   * \brief Return a reference to a vector containing the metadata of all the
+   * dependencies of the extension.
+   */
+  const std::vector<gd::SourceFileMetadata>& GetAllSourceFiles() const;
+
   /**
    * \brief Return a reference to a map containing the names of the actions,
    * related to the object type, and the metadata associated with.
@@ -634,26 +652,30 @@ class GD_CORE_API PlatformExtension {
    */
   static gd::String GetNamespaceSeparator() { return "::"; }
 
-  static gd::String GetEventsFunctionFullType(const gd::String &extensionName,
-                                              const gd::String &functionName);
+  static gd::String GetEventsFunctionFullType(const gd::String& extensionName,
+                                              const gd::String& functionName);
 
-  static gd::String
-  GetBehaviorEventsFunctionFullType(const gd::String &extensionName,
-                                    const gd::String &behaviorName,
-                                    const gd::String &functionName);
+  static gd::String GetBehaviorEventsFunctionFullType(
+      const gd::String& extensionName,
+      const gd::String& behaviorName,
+      const gd::String& functionName);
 
-  static gd::String GetBehaviorFullType(const gd::String &extensionName,
-                                        const gd::String &behaviorName);
+  static gd::String GetBehaviorFullType(const gd::String& extensionName,
+                                        const gd::String& behaviorName);
 
-  static gd::String
-  GetObjectEventsFunctionFullType(const gd::String &extensionName,
-                                  const gd::String &objectName,
-                                  const gd::String &functionName);
+  static gd::String GetObjectEventsFunctionFullType(
+      const gd::String& extensionName,
+      const gd::String& objectName,
+      const gd::String& functionName);
 
-  static gd::String GetObjectFullType(const gd::String &extensionName,
-                                      const gd::String &objectName);
+  static gd::String GetObjectFullType(const gd::String& extensionName,
+                                      const gd::String& objectName);
 
-private:
+  static gd::String GetExtensionFromFullObjectType(const gd::String& type);
+
+  static gd::String GetObjectNameFromFullObjectType(const gd::String& type);
+
+ private:
   /**
    * Set the namespace (the string all actions/conditions/expressions start
    * with).
@@ -668,10 +690,10 @@ private:
   gd::String fullname;      ///< Name displayed to users in the editor.
   gd::String informations;  ///< Description displayed to users in the editor.
   gd::String category;
-  gd::String author;        ///< Author displayed to users in the editor.
-  gd::String license;       ///< License name displayed to users in the editor.
-  bool deprecated;  ///< true if the extension is deprecated and shouldn't be
-                    ///< shown in IDE.
+  gd::String author;   ///< Author displayed to users in the editor.
+  gd::String license;  ///< License name displayed to users in the editor.
+  bool deprecated;     ///< true if the extension is deprecated and shouldn't be
+                       ///< shown in IDE.
   gd::String helpPath;  ///< The relative path to the help for this extension in
                         ///< the documentation.
   gd::String iconUrl;   ///< The URL to the icon to be shown for this extension.
@@ -685,6 +707,7 @@ private:
   std::map<gd::String, gd::ExpressionMetadata> expressionsInfos;
   std::map<gd::String, gd::ExpressionMetadata> strExpressionsInfos;
   std::vector<gd::DependencyMetadata> extensionDependenciesMetadata;
+  std::vector<gd::SourceFileMetadata> extensionSourceFilesMetadata;
   std::map<gd::String, gd::EventMetadata> eventsInfos;
   std::map<gd::String, gd::PropertyDescriptor> extensionPropertiesMetadata;
   std::map<gd::String, InstructionOrExpressionGroupMetadata>

Core/GDCore/Extensions/PlatformExtension.inl

@@ -5,6 +5,8 @@
  * project is released under the MIT License.
  */
 
+// NOLINTBEGIN
+
 #ifndef GDCORE_PLATFORMEXTENSION_INL
 #define GDCORE_PLATFORMEXTENSION_INL
 
@@ -36,3 +38,5 @@ gd::ObjectMetadata& PlatformExtension::AddObject(const gd::String& name,
 }  // namespace gd
 
 #endif
+
+// NOLINTEND

Core/GDCore/IDE/CaptureOptions.cpp

@@ -0,0 +1,18 @@
+/*
+ * 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/CaptureOptions.h"
+
+#include "GDCore/String.h"
+
+using namespace std;
+
+namespace gd {
+
+Screenshot::Screenshot() {}
+
+CaptureOptions::CaptureOptions() {}
+
+}  // namespace gd

Core/GDCore/IDE/CaptureOptions.h

@@ -0,0 +1,50 @@
+#pragma once
+#include <memory>
+#include <vector>
+
+#include "GDCore/String.h"
+
+namespace gd {
+
+class GD_CORE_API Screenshot {
+ public:
+  Screenshot();
+  virtual ~Screenshot() {};
+
+  void SetDelayTimeInSeconds(int delayTimeInMs_) {
+    delayTimeInMs = delayTimeInMs_;
+  }
+  int GetDelayTimeInSeconds() const { return delayTimeInMs; }
+
+  void SetSignedUrl(const gd::String& signedUrl_) { signedUrl = signedUrl_; }
+  const gd::String& GetSignedUrl() const { return signedUrl; }
+
+  void SetPublicUrl(const gd::String& publicUrl_) { publicUrl = publicUrl_; }
+  const gd::String& GetPublicUrl() const { return publicUrl; }
+
+ private:
+  int delayTimeInMs = 0;
+  gd::String signedUrl;
+  gd::String publicUrl;
+};
+
+class GD_CORE_API CaptureOptions {
+ public:
+  CaptureOptions();
+  virtual ~CaptureOptions() {};
+
+  bool IsEmpty() const { return screenshots.empty(); }
+
+  void AddScreenshot(const Screenshot& screenshot) {
+    screenshots.push_back(screenshot);
+  }
+
+  const std::vector<Screenshot>& GetScreenshots() const { return screenshots; }
+
+  void ClearScreenshots() { screenshots.clear(); }
+
+ private:
+  std::vector<Screenshot> screenshots;
+};
+
+}  // namespace gd

Core/GDCore/IDE/DependenciesAnalyzer.cpp

@@ -12,7 +12,6 @@
 #include "GDCore/Project/ExternalEvents.h"
 #include "GDCore/Project/Layout.h"
 #include "GDCore/Project/Project.h"
-#include "GDCore/Project/SourceFile.h"
 
 DependenciesAnalyzer::DependenciesAnalyzer(const gd::Project& project_,
                                            const gd::Layout& layout_)
@@ -74,16 +73,6 @@ bool DependenciesAnalyzer::Analyze(const gd::EventsList& events) {
       }
     }
 
-    // Search for source files dependencies
-    std::vector<gd::String> dependencies =
-        events[i].GetSourceFileDependencies();
-    sourceFilesDependencies.insert(dependencies.begin(), dependencies.end());
-
-    const gd::String& associatedSourceFile =
-        events[i].GetAssociatedGDManagedSourceFile(const_cast<gd::Project&>(project));
-    if (!associatedSourceFile.empty())
-      sourceFilesDependencies.insert(associatedSourceFile);
-
     // Analyze sub events dependencies
     if (events[i].CanHaveSubEvents()) {
       if (!Analyze(events[i].GetSubEvents())) return false;

Core/GDCore/IDE/DependenciesAnalyzer.h

@@ -71,14 +71,6 @@ class GD_CORE_API DependenciesAnalyzer {
     return externalEventsDependencies;
   };
 
-  /**
-   * \brief Return the source files being dependencies of the scene or external
-   * events passed in the constructor.
-   */
-  const std::set<gd::String>& GetSourceFilesDependencies() const {
-    return sourceFilesDependencies;
-  };
-
  private:
   /**
    * \brief Analyze the dependencies of the events.
@@ -92,7 +84,6 @@ class GD_CORE_API DependenciesAnalyzer {
 
   std::set<gd::String> scenesDependencies;
   std::set<gd::String> externalEventsDependencies;
-  std::set<gd::String> sourceFilesDependencies;
   std::vector<gd::String>
       parentScenes;  ///< Used to check for circular dependencies.
   std::vector<gd::String>

Core/GDCore/IDE/EventBasedBehaviorBrowser.cpp

@@ -26,12 +26,9 @@ 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(
-    gd::Project &project, gd::ArbitraryObjectsWorker &worker) const {}
-
 void EventBasedBehaviorBrowser::ExposeFunctions(
     gd::Project &project, gd::ArbitraryEventsFunctionsWorker &worker) const {
   worker.Launch(eventsBasedBehavior.GetEventsFunctions());
@@ -43,7 +40,4 @@ void EventBasedBehaviorBrowser::ExposeEventBasedBehaviors(
   worker.Launch(eventsBasedBehavior);
 }
 
-void EventBasedBehaviorBrowser::ExposeBehaviorSharedDatas(
-    gd::Project &project, gd::ArbitraryBehaviorSharedDataWorker &worker) const {}
-
 } // namespace gd

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;
 
   /**
@@ -64,7 +67,7 @@ public:
    * \brief Do nothing.
    */
   void ExposeObjects(gd::Project &project,
-                     gd::ArbitraryObjectsWorker &worker) const override;
+                     gd::ArbitraryObjectsWorker &worker) const override {};
 
   /**
    * \brief Call the specified worker on the event-based behavior.
@@ -77,9 +80,10 @@ public:
    * \brief Do nothing.
    */
   void ExposeBehaviorSharedDatas(gd::Project &project,
-                         gd::ArbitraryBehaviorSharedDataWorker &worker) const override;
+                         gd::ArbitraryBehaviorSharedDataWorker &worker) const override {};
 
 private:
+  const gd::EventsFunctionsExtension &eventsFunctionsExtension;
   gd::EventsBasedBehavior &eventsBasedBehavior;
 };
 

Core/GDCore/IDE/EventBasedObjectBrowser.cpp

@@ -0,0 +1,37 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "EventBasedObjectBrowser.h"
+
+#include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
+#include "GDCore/IDE/Project/ArbitraryEventBasedBehaviorsWorker.h"
+#include "GDCore/IDE/Project/ArbitraryEventsFunctionsWorker.h"
+#include "GDCore/IDE/Project/ArbitraryObjectsWorker.h"
+#include "GDCore/IDE/Project/ArbitraryBehaviorSharedDataWorker.h"
+#include "GDCore/IDE/ProjectBrowserHelper.h"
+#include "GDCore/Project/EventsBasedObject.h"
+#include "GDCore/Project/Project.h"
+#include "GDCore/String.h"
+
+namespace gd {
+
+void EventBasedObjectBrowser::ExposeEvents(
+    gd::Project &project, gd::ArbitraryEventsWorker &worker) const {
+  gd::ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
+      project, eventsBasedObject, worker);
+}
+
+void EventBasedObjectBrowser::ExposeEvents(
+    gd::Project &project, gd::ArbitraryEventsWorkerWithContext &worker) const {
+  gd::ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
+      project, eventsFunctionsExtension, eventsBasedObject, worker);
+}
+
+void EventBasedObjectBrowser::ExposeFunctions(
+    gd::Project &project, gd::ArbitraryEventsFunctionsWorker &worker) const {
+  worker.Launch(eventsBasedObject.GetEventsFunctions());
+}
+
+} // namespace gd

Core/GDCore/IDE/EventBasedObjectBrowser.h

@@ -0,0 +1,90 @@
+/*
+ * 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/IDE/ProjectBrowser.h"
+
+namespace gd {
+class Project;
+class String;
+class EventsFunctionsExtension;
+class EventsFunction;
+class EventsBasedBehavior;
+class EventsBasedObject;
+class ArbitraryEventsWorker;
+class ArbitraryEventsWorkerWithContext;
+class ArbitraryEventsFunctionsWorker;
+class ArbitraryObjectsWorker;
+class ArbitraryEventBasedBehaviorsWorker;
+class ArbitraryBehaviorSharedDataWorker;
+} // namespace gd
+
+namespace gd {
+
+/**
+ * \brief Expose event-based object contents to workers.
+ */
+class GD_CORE_API EventBasedObjectBrowser : public ProjectBrowser {
+public:
+  EventBasedObjectBrowser(
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension_,
+      gd::EventsBasedObject &eventsBasedObject_)
+      : eventsFunctionsExtension(eventsFunctionsExtension_),
+        eventsBasedObject(eventsBasedObject_) {}
+
+  /**
+   * \brief Call the specified worker on all events of the event-based
+   * object.
+   *
+   * This should be the preferred way to traverse all the events of an event-based object.
+   */
+  void ExposeEvents(gd::Project &project,
+                    gd::ArbitraryEventsWorker &worker) const override;
+
+  /**
+   * \brief Call the specified worker on all events of the event-based
+   * object.
+   *
+   * This should be the preferred way to traverse all the events of an event-based object.
+   */
+  void
+  ExposeEvents(gd::Project &project, 
+               gd::ArbitraryEventsWorkerWithContext &worker) const override;
+
+  /**
+   * \brief Call the specified worker on all functions of the event-based object
+   *
+   * This should be the preferred way to traverse all the function signatures
+   * of an event-based object.
+   */
+  void ExposeFunctions(gd::Project &project,
+                       gd::ArbitraryEventsFunctionsWorker &worker) const override;
+
+  /**
+   * \brief Do nothing.
+   */
+  void ExposeObjects(gd::Project &project,
+                     gd::ArbitraryObjectsWorker &worker) const override {};
+
+  /**
+   * @brief Do nothing.
+   */
+  void ExposeEventBasedBehaviors(
+      gd::Project &project,
+      gd::ArbitraryEventBasedBehaviorsWorker &worker) const override {};
+
+  /**
+   * \brief Do nothing.
+   */
+  void ExposeBehaviorSharedDatas(gd::Project &project,
+                         gd::ArbitraryBehaviorSharedDataWorker &worker) const override {};
+
+private:
+  const gd::EventsFunctionsExtension &eventsFunctionsExtension;
+  gd::EventsBasedObject &eventsBasedObject;
+};
+
+} // namespace gd

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/EventsFunctionSelfCallChecker.cpp

@@ -72,12 +72,12 @@ public:
       gd::String lastObjectParameter = "";
       const gd::InstructionMetadata &instrInfos =
           MetadataProvider::GetActionMetadata(platform, instruction.GetType());
-      for (std::size_t pNb = 0; pNb < instrInfos.parameters.size(); ++pNb) {
+      for (std::size_t pNb = 0; pNb < instrInfos.parameters.GetParametersCount(); ++pNb) {
 
         if (ParameterMetadata::IsExpression(
-                "number", instrInfos.parameters[pNb].GetType()) ||
+                "number", instrInfos.parameters.GetParameter(pNb).GetType()) ||
             ParameterMetadata::IsExpression(
-                "string", instrInfos.parameters[pNb].GetType())) {
+                "string", instrInfos.parameters.GetParameter(pNb).GetType())) {
           auto node = instruction.GetParameter(pNb).GetRootNode();
           node->Visit(*this);
         }

Core/GDCore/IDE/Events/EventsIdentifiersFinder.cpp

@@ -86,9 +86,11 @@ class GD_CORE_API IdentifierFinderExpressionNodeWorker
     }
 
     size_t parameterIndex = 0;
-    for (size_t metadataIndex = (isObjectFunction ? 1 : 0); metadataIndex < metadata.parameters.size()
-      && parameterIndex < node.parameters.size(); ++metadataIndex) {
-      auto& parameterMetadata = metadata.parameters[metadataIndex];
+    for (size_t metadataIndex = (isObjectFunction ? 1 : 0);
+         metadataIndex < metadata.GetParameters().GetParametersCount() &&
+         parameterIndex < node.parameters.size();
+         ++metadataIndex) {
+      auto& parameterMetadata = metadata.GetParameters().GetParameter(metadataIndex);
       if (parameterMetadata.IsCodeOnly()) {
         continue;
       }
@@ -144,10 +146,10 @@ class GD_CORE_API IdentifierFinderEventWorker
                               platform, instruction.GetType())
                         : MetadataProvider::GetActionMetadata(
                               platform, instruction.GetType());
-      for (std::size_t pNb = 0; pNb < instrInfos.parameters.size(); ++pNb) {
+      for (std::size_t pNb = 0; pNb < instrInfos.parameters.GetParametersCount(); ++pNb) {
         // The parameter has the searched type...
-      if (instrInfos.parameters[pNb].GetType() == "identifier"
-       && instrInfos.parameters[pNb].GetExtraInfo() == identifierType) {
+      if (instrInfos.parameters.GetParameter(pNb).GetType() == "identifier"
+       && instrInfos.parameters.GetParameter(pNb).GetExtraInfo() == identifierType) {
           //...remember the value of the parameter.
           if (objectName.empty() || lastObjectParameter == objectName) {
             results.insert(instruction.GetParameter(pNb).GetPlainString());
@@ -155,9 +157,9 @@ class GD_CORE_API IdentifierFinderEventWorker
         }
         // Search in expressions
         else if (ParameterMetadata::IsExpression(
-                    "number", instrInfos.parameters[pNb].GetType()) ||
+                    "number", instrInfos.parameters.GetParameter(pNb).GetType()) ||
                 ParameterMetadata::IsExpression(
-                    "string", instrInfos.parameters[pNb].GetType())) {
+                    "string", instrInfos.parameters.GetParameter(pNb).GetType())) {
           auto node = instruction.GetParameter(pNb).GetRootNode();
 
           IdentifierFinderExpressionNodeWorker searcher(
@@ -170,7 +172,7 @@ class GD_CORE_API IdentifierFinderEventWorker
         }
         // Remember the value of the last "object" parameter.
         else if (gd::ParameterMetadata::IsObject(
-                    instrInfos.parameters[pNb].GetType())) {
+                    instrInfos.parameters.GetParameter(pNb).GetType())) {
           lastObjectParameter =
               instruction.GetParameter(pNb).GetPlainString();
         }

Core/GDCore/IDE/Events/EventsLeaderboardsLister.cpp

@@ -1,41 +0,0 @@
-/*
- * 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/EventsLeaderboardsLister.h"
-
-#include <map>
-#include <memory>
-#include <vector>
-
-#include "GDCore/Events/Event.h"
-#include "GDCore/Events/EventsList.h"
-#include "GDCore/Extensions/Metadata/InstructionMetadata.h"
-#include "GDCore/Extensions/Metadata/MetadataProvider.h"
-#include "GDCore/Project/Layout.h"
-#include "GDCore/Project/Project.h"
-#include "GDCore/String.h"
-
-namespace gd {
-
-bool EventsLeaderboardsLister::DoVisitInstruction(gd::Instruction& instruction,
-                                                  bool isCondition) {
-  const gd::InstructionMetadata& instrInfo =
-      isCondition ? MetadataProvider::GetConditionMetadata(
-                        project.GetCurrentPlatform(), instruction.GetType())
-                  : MetadataProvider::GetActionMetadata(
-                        project.GetCurrentPlatform(), instruction.GetType());
-
-  for (int i = 0; i < instruction.GetParametersCount() &&
-                  i < instrInfo.GetParametersCount();
-       ++i)
-    if (instrInfo.GetParameter(i).GetType() == "leaderboardId") {
-      leaderboardIds.insert(instruction.GetParameter(i).GetPlainString());
-    }
-  return false;
-}
-
-EventsLeaderboardsLister::~EventsLeaderboardsLister() {}
-
-}  // namespace gd

Core/GDCore/IDE/Events/EventsLeaderboardsLister.h

@@ -1,48 +0,0 @@
-/*
- * GDevelop Core
- * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
- * reserved. This project is released under the MIT License.
- */
-#ifndef EventsLeaderboardsLister_H
-#define EventsLeaderboardsLister_H
-#include <map>
-#include <memory>
-#include <set>
-#include <vector>
-
-#include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
-#include "GDCore/String.h"
-namespace gd {
-class BaseEvent;
-class Project;
-class EventsList;
-}
-
-namespace gd {
-
-/**
- * \brief List the leaderboard ids in the instructions.
- *
- * \ingroup IDE
- */
-class GD_CORE_API EventsLeaderboardsLister : public ArbitraryEventsWorker {
- public:
-  EventsLeaderboardsLister(gd::Project& project_) : project(project_){};
-  virtual ~EventsLeaderboardsLister();
-
-  /**
-   * Return the values of all leaderboardIds found in the events.
-   */
-  const std::set<gd::String>& GetLeaderboardIds() { return leaderboardIds; }
-
- private:
-  virtual bool DoVisitInstruction(gd::Instruction& instruction,
-                                  bool isCondition);
-
-  std::set<gd::String> leaderboardIds;
-  gd::Project& project;
-};
-
-}  // namespace gd
-
-#endif  // EventsLeaderboardsLister_H

Core/GDCore/IDE/Events/EventsLeaderboardsRenamer.cpp

@@ -1,49 +0,0 @@
-/*
- * 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/EventsLeaderboardsRenamer.h"
-
-#include <map>
-#include <memory>
-#include <vector>
-
-#include "GDCore/Events/Event.h"
-#include "GDCore/Events/EventsList.h"
-#include "GDCore/Extensions/Metadata/InstructionMetadata.h"
-#include "GDCore/Extensions/Metadata/MetadataProvider.h"
-#include "GDCore/Project/Layout.h"
-#include "GDCore/Project/Project.h"
-#include "GDCore/String.h"
-
-namespace gd {
-
-bool EventsLeaderboardsRenamer::DoVisitInstruction(gd::Instruction& instruction,
-                                                   bool isCondition) {
-  const gd::InstructionMetadata& instrInfo =
-      isCondition ? MetadataProvider::GetConditionMetadata(
-                        project.GetCurrentPlatform(), instruction.GetType())
-                  : MetadataProvider::GetActionMetadata(
-                        project.GetCurrentPlatform(), instruction.GetType());
-
-  for (int i = 0; i < instruction.GetParametersCount() &&
-                  i < instrInfo.GetParametersCount();
-       ++i) {
-    const gd::ParameterMetadata parameter = instrInfo.GetParameter(i);
-
-    if (parameter.GetType() == "leaderboardId") {
-      const gd::String leaderboardId =
-          instruction.GetParameter(i).GetPlainString();
-
-      if (leaderboardIdMap.find(leaderboardId) != leaderboardIdMap.end()) {
-        instruction.SetParameter(i, leaderboardIdMap[leaderboardId]);
-      }
-    }
-  }
-  return false;
-}
-
-EventsLeaderboardsRenamer::~EventsLeaderboardsRenamer() {}
-
-}  // namespace gd

Core/GDCore/IDE/Events/EventsLeaderboardsRenamer.h

@@ -1,46 +0,0 @@
-/*
- * GDevelop Core
- * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
- * reserved. This project is released under the MIT License.
- */
-#ifndef EventsLeaderboardsRenamer_H
-#define EventsLeaderboardsRenamer_H
-#include <map>
-#include <memory>
-#include <set>
-#include <vector>
-
-#include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
-#include "GDCore/String.h"
-namespace gd {
-class BaseEvent;
-class Project;
-class EventsList;
-}
-
-namespace gd {
-
-/**
- * \brief Replace the leaderboard ids in the instructions.
- *
- * \ingroup IDE
- */
-class GD_CORE_API EventsLeaderboardsRenamer : public ArbitraryEventsWorker {
- public:
-  EventsLeaderboardsRenamer(
-      gd::Project& project_,
-      const std::map<gd::String, gd::String>& leaderboardIdMap_)
-      : project(project_), leaderboardIdMap(leaderboardIdMap_){};
-  virtual ~EventsLeaderboardsRenamer();
-
- private:
-  virtual bool DoVisitInstruction(gd::Instruction& instruction,
-                                  bool isCondition);
-
-  std::map<gd::String, gd::String> leaderboardIdMap;
-  gd::Project& project;
-};
-
-}  // namespace gd
-
-#endif  // EventsLeaderboardsRenamer_H

Core/GDCore/IDE/Events/EventsParameterReplacer.cpp

@@ -0,0 +1,243 @@
+/*
+ * 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/EventsParameterReplacer.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/Project/Layout.h"
+#include "GDCore/Project/Project.h"
+#include "GDCore/Project/ProjectScopedContainers.h"
+#include "GDCore/Project/PropertiesContainer.h"
+#include "GDCore/String.h"
+#include "GDCore/Tools/Log.h"
+
+namespace gd {
+
+/**
+ * \brief Go through the nodes and rename parameters.
+ *
+ * \see gd::ExpressionParser2
+ */
+class GD_CORE_API ExpressionParameterReplacer
+    : public ExpressionParser2NodeWorker {
+ public:
+  ExpressionParameterReplacer(
+      const gd::Platform& platform_,
+      const gd::ProjectScopedContainers& projectScopedContainers_,
+      bool isParentTypeAVariable_,
+      const std::unordered_map<gd::String, gd::String>& oldToNewPropertyNames_)
+      : hasDoneRenaming(false),
+        platform(platform_),
+        projectScopedContainers(projectScopedContainers_),
+        isParentTypeAVariable(isParentTypeAVariable_),
+        oldToNewPropertyNames(oldToNewPropertyNames_){};
+  virtual ~ExpressionParameterReplacer(){};
+
+  bool HasDoneRenaming() const { return hasDoneRenaming; }
+
+ protected:
+  void OnVisitSubExpressionNode(SubExpressionNode& node) override {
+    node.expression->Visit(*this);
+  }
+  void OnVisitOperatorNode(OperatorNode& node) override {
+    node.leftHandSide->Visit(*this);
+    node.rightHandSide->Visit(*this);
+  }
+  void OnVisitUnaryOperatorNode(UnaryOperatorNode& node) override {
+    node.factor->Visit(*this);
+  }
+  void OnVisitNumberNode(NumberNode& node) override {}
+  void OnVisitTextNode(TextNode& node) override {}
+  void OnVisitVariableNode(VariableNode& node) override {
+    if (isParentTypeAVariable) {
+        // Do nothing, it's a variable.
+        if (node.child) node.child->Visit(*this);
+        return;
+    }
+
+    // The node represents a variable or an object name on which a variable
+    // will be accessed, or a property with a child.
+
+    projectScopedContainers.MatchIdentifierWithName<void>(
+      // The property name is changed after the refactor operation.
+      node.name,
+      [&]() {
+        // Do nothing, it's an object variable.
+        if (node.child) node.child->Visit(*this);
+      }, [&]() {
+        // Do nothing, it's a variable.
+        if (node.child) node.child->Visit(*this);
+      }, [&]() {
+        // Do nothing, it's a property.
+        if (node.child) node.child->Visit(*this);
+      }, [&]() {
+        // This is a parameter
+        RenameParameter(node.name);
+        if (node.child) node.child->Visit(*this);
+      }, [&]() {
+        // Do nothing, it's something else.
+        if (node.child) node.child->Visit(*this);
+      });
+  }
+  void OnVisitVariableAccessorNode(VariableAccessorNode& node) override {
+    if (node.child) node.child->Visit(*this);
+  }
+  void OnVisitVariableBracketAccessorNode(
+      VariableBracketAccessorNode& node) override {
+    bool isGrandParentTypeAVariable = isParentTypeAVariable;
+    isParentTypeAVariable = false;
+    node.expression->Visit(*this);
+    isParentTypeAVariable = isGrandParentTypeAVariable;
+    if (node.child) node.child->Visit(*this);
+  }
+  void OnVisitIdentifierNode(IdentifierNode& node) override {
+    if (isParentTypeAVariable) {
+        // Do nothing, it's a variable.
+        return;
+    }
+    projectScopedContainers.MatchIdentifierWithName<void>(
+      // The property name is changed after the refactor operation
+      node.identifierName,
+      [&]() {
+        // Do nothing, it's an object variable.
+      }, [&]() {
+        // Do nothing, it's a variable.
+      }, [&]() {
+        // Do nothing, it's a property.
+      }, [&]() {
+        // This is a parameter.
+        RenameParameter(node.identifierName);
+      }, [&]() {
+        // Do nothing, it's something else.
+      });
+  }
+  void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode& node) override {}
+  void OnVisitFunctionCallNode(FunctionCallNode &node) override {
+    bool isGrandParentTypeAVariable = isParentTypeAVariable;
+    for (auto &parameter : node.parameters) {
+      const auto &parameterMetadata =
+          gd::MetadataProvider::GetFunctionCallParameterMetadata(
+              platform, projectScopedContainers.GetObjectsContainersList(),
+              node, *parameter);
+      if (!parameterMetadata) {
+        continue;
+      }
+      const auto &parameterTypeMetadata =
+          parameterMetadata->GetValueTypeMetadata();
+      if (gd::EventsParameterReplacer::CanContainParameter(
+              parameterTypeMetadata)) {
+        isParentTypeAVariable = parameterTypeMetadata.IsVariableOnly();
+        parameter->Visit(*this);
+      }
+    }
+    isParentTypeAVariable = isGrandParentTypeAVariable;
+  }
+  void OnVisitEmptyNode(EmptyNode& node) override {}
+
+ private:
+  bool hasDoneRenaming;
+
+  bool RenameParameter(
+      gd::String& name) {
+    if (oldToNewPropertyNames.count(name) >= 1) {
+      name = oldToNewPropertyNames.find(name)->second;
+      hasDoneRenaming = true;
+      return true;
+    }
+
+    return false;  // Nothing was changed or done.
+  }
+
+  // Scope:
+  const gd::Platform& platform;
+  const gd::ProjectScopedContainers& projectScopedContainers;
+
+  // Renaming to do
+  const std::unordered_map<gd::String, gd::String>& oldToNewPropertyNames;
+
+  gd::String objectNameToUseForVariableAccessor;
+  bool isParentTypeAVariable;
+};
+
+bool EventsParameterReplacer::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 (!gd::EventsParameterReplacer::CanContainParameter(
+          parameterMetadata.GetValueTypeMetadata())) {
+          return;
+        }
+        auto node = parameterValue.GetRootNode();
+        if (node) {
+          ExpressionParameterReplacer renamer(
+              platform, GetProjectScopedContainers(),
+              parameterMetadata.GetValueTypeMetadata().IsVariableOnly(),
+              oldToNewPropertyNames);
+          node->Visit(renamer);
+
+          if (renamer.HasDoneRenaming()) {
+            instruction.SetParameter(
+                parameterIndex, ExpressionParser2NodePrinter::PrintNode(*node));
+          }
+        }
+      });
+
+  return false;
+}
+
+bool EventsParameterReplacer::DoVisitEventExpression(
+    gd::Expression& expression, const gd::ParameterMetadata& metadata) {
+  if (!gd::EventsParameterReplacer::CanContainParameter(
+          metadata.GetValueTypeMetadata())) {
+    return false;
+  }
+  auto node = expression.GetRootNode();
+  if (node) {
+    ExpressionParameterReplacer renamer(
+        platform, GetProjectScopedContainers(),
+        metadata.GetValueTypeMetadata().IsVariableOnly(), oldToNewPropertyNames);
+    node->Visit(renamer);
+
+    if (renamer.HasDoneRenaming()) {
+      expression = ExpressionParser2NodePrinter::PrintNode(*node);
+    }
+  }
+
+  return false;
+}
+
+bool EventsParameterReplacer::CanContainParameter(
+    const gd::ValueTypeMetadata &valueTypeMetadata) {
+  return valueTypeMetadata.IsVariable() || valueTypeMetadata.IsNumber() ||
+         valueTypeMetadata.IsString();
+}
+
+EventsParameterReplacer::~EventsParameterReplacer() {}
+
+}  // namespace gd

Core/GDCore/IDE/Events/EventsParameterReplacer.h

@@ -0,0 +1,52 @@
+/*
+ * 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 <map>
+#include <memory>
+#include <unordered_map>
+#include <unordered_set>
+#include <vector>
+
+#include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
+#include "GDCore/String.h"
+namespace gd {
+class BaseEvent;
+class PropertiesContainer;
+class EventsList;
+class Platform;
+}  // namespace gd
+
+namespace gd {
+/**
+ * \brief Replace in expressions and in parameters of actions or conditions,
+ * references to the name of a parameter by another.
+ *
+ * \ingroup IDE
+ */
+class GD_CORE_API EventsParameterReplacer
+    : public ArbitraryEventsWorkerWithContext {
+ public:
+  EventsParameterReplacer(
+      const gd::Platform &platform_,
+      const std::unordered_map<gd::String, gd::String> &oldToNewPropertyNames_)
+      : platform(platform_),
+        oldToNewPropertyNames(oldToNewPropertyNames_){};
+  virtual ~EventsParameterReplacer();
+
+  static bool CanContainParameter(const gd::ValueTypeMetadata &valueTypeMetadata);
+
+ private:
+  bool DoVisitInstruction(gd::Instruction &instruction,
+                          bool isCondition) override;
+  bool DoVisitEventExpression(gd::Expression &expression,
+                              const gd::ParameterMetadata &metadata) override;
+
+  const gd::Platform &platform;
+  const std::unordered_map<gd::String, gd::String> &oldToNewPropertyNames;
+};
+
+}  // namespace gd

Core/GDCore/IDE/Events/EventsPropertyReplacer.cpp

@@ -41,6 +41,7 @@ class GD_CORE_API ExpressionPropertyReplacer
       const gd::Platform& platform_,
       const gd::ProjectScopedContainers& projectScopedContainers_,
       const gd::PropertiesContainer& targetPropertiesContainer_,
+      bool isParentTypeAVariable_,
       const std::unordered_map<gd::String, gd::String>& oldToNewPropertyNames_,
       const std::unordered_set<gd::String>& removedPropertyNames_)
       : hasDoneRenaming(false),
@@ -48,6 +49,7 @@ class GD_CORE_API ExpressionPropertyReplacer
         platform(platform_),
         projectScopedContainers(projectScopedContainers_),
         targetPropertiesContainer(targetPropertiesContainer_),
+        isParentTypeAVariable(isParentTypeAVariable_),
         oldToNewPropertyNames(oldToNewPropertyNames_),
         removedPropertyNames(removedPropertyNames_){};
   virtual ~ExpressionPropertyReplacer(){};
@@ -69,16 +71,21 @@ class GD_CORE_API ExpressionPropertyReplacer
   void OnVisitNumberNode(NumberNode& node) override {}
   void OnVisitTextNode(TextNode& node) override {}
   void OnVisitVariableNode(VariableNode& node) override {
+    if (isParentTypeAVariable) {
+        // Do nothing, it's a variable.
+        if (node.child) node.child->Visit(*this);
+        return;
+    }
+
     auto& propertiesContainersList =
         projectScopedContainers.GetPropertiesContainersList();
 
     // The node represents a variable or an object name on which a variable
     // will be accessed, or a property with a child.
 
-    // Match the potential *new* name of the property, because refactorings are
-    // done after changes in the variables container.
     projectScopedContainers.MatchIdentifierWithName<void>(
-      GetPotentialNewName(node.name),
+      // The property name is changed after the refactor operation.
+      node.name,
       [&]() {
         // Do nothing, it's an object variable.
         if (node.child) node.child->Visit(*this);
@@ -100,16 +107,7 @@ class GD_CORE_API ExpressionPropertyReplacer
         // Do nothing, it's a parameter.
         if (node.child) node.child->Visit(*this);
       }, [&]() {
-        // This is something else - potentially a deleted property.
-        // Check if it's coming from the target container with
-        // properties to replace.
-        if (propertiesContainersList.HasPropertiesContainer(
-                targetPropertiesContainer)) {
-          // The node represents a property, that can come from the target
-          // (because the target is in the scope), replace or remove it:
-          RenameOrRemovePropertyOfTargetPropertyContainer(node.name);
-        }
-
+        // Do nothing, it's something else.
         if (node.child) node.child->Visit(*this);
       });
   }
@@ -118,17 +116,24 @@ class GD_CORE_API ExpressionPropertyReplacer
   }
   void OnVisitVariableBracketAccessorNode(
       VariableBracketAccessorNode& node) override {
+    bool isGrandParentTypeAVariable = isParentTypeAVariable;
+    isParentTypeAVariable = false;
     node.expression->Visit(*this);
+    isParentTypeAVariable = isGrandParentTypeAVariable;
     if (node.child) node.child->Visit(*this);
   }
   void OnVisitIdentifierNode(IdentifierNode& node) override {
+    if (isParentTypeAVariable) {
+        // Do nothing, it's a variable.
+        return;
+    }
+
     auto& propertiesContainersList =
         projectScopedContainers.GetPropertiesContainersList();
 
-    // Match the potential *new* name of the property, because refactorings are
-    // done after changes in the variables container.
     projectScopedContainers.MatchIdentifierWithName<void>(
-      GetPotentialNewName(node.identifierName),
+      // The property name is changed after the refactor operation
+      node.identifierName,
       [&]() {
         // Do nothing, it's an object variable.
       }, [&]() {
@@ -145,22 +150,29 @@ class GD_CORE_API ExpressionPropertyReplacer
       }, [&]() {
         // Do nothing, it's a parameter.
       }, [&]() {
-        // This is something else - potentially a deleted property.
-        // Check if it's coming from the target container with
-        // properties to replace.
-        if (propertiesContainersList.HasPropertiesContainer(
-                targetPropertiesContainer)) {
-          // The node represents a property, that can come from the target
-          // (because the target is in the scope), replace or remove it:
-          RenameOrRemovePropertyOfTargetPropertyContainer(node.identifierName);
-        }
+        // Do nothing, it's something else.
       });
   }
   void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode& node) override {}
-  void OnVisitFunctionCallNode(FunctionCallNode& node) override {
-    for (auto& parameter : node.parameters) {
-      parameter->Visit(*this);
+  void OnVisitFunctionCallNode(FunctionCallNode &node) override {
+    bool isGrandParentTypeAVariable = isParentTypeAVariable;
+    for (auto &parameter : node.parameters) {
+      const auto &parameterMetadata =
+          gd::MetadataProvider::GetFunctionCallParameterMetadata(
+              platform, projectScopedContainers.GetObjectsContainersList(),
+              node, *parameter);
+      if (!parameterMetadata) {
+        continue;
+      }
+      const auto &parameterTypeMetadata =
+          parameterMetadata->GetValueTypeMetadata();
+      if (gd::EventsPropertyReplacer::CanContainProperty(
+              parameterTypeMetadata)) {
+        isParentTypeAVariable = parameterTypeMetadata.IsVariableOnly();
+        parameter->Visit(*this);
+      }
     }
+    isParentTypeAVariable = isGrandParentTypeAVariable;
   }
   void OnVisitEmptyNode(EmptyNode& node) override {}
 
@@ -168,12 +180,6 @@ class GD_CORE_API ExpressionPropertyReplacer
   bool hasDoneRenaming;
   bool removedPropertyUsed;
 
-  const gd::String& GetPotentialNewName(const gd::String& oldName) {
-    return oldToNewPropertyNames.count(oldName) >= 1
-            ? oldToNewPropertyNames.find(oldName)->second
-            : oldName;
-  }
-
   bool RenameOrRemovePropertyOfTargetPropertyContainer(
       gd::String& propertyName) {
     if (oldToNewPropertyNames.count(propertyName) >= 1) {
@@ -198,6 +204,7 @@ class GD_CORE_API ExpressionPropertyReplacer
   const std::unordered_set<gd::String>& removedPropertyNames;
 
   gd::String objectNameToUseForVariableAccessor;
+  bool isParentTypeAVariable;
 };
 
 bool EventsPropertyReplacer::DoVisitInstruction(gd::Instruction& instruction,
@@ -216,20 +223,16 @@ bool EventsPropertyReplacer::DoVisitInstruction(gd::Instruction& instruction,
           const gd::Expression& parameterValue,
           size_t parameterIndex,
           const gd::String& lastObjectName) {
-        const gd::String& type = parameterMetadata.GetType();
-
-        if (!gd::ParameterMetadata::IsExpression("variable", type) &&
-            !gd::ParameterMetadata::IsExpression("number", type) &&
-            !gd::ParameterMetadata::IsExpression("string", type))
-          return;  // Not an expression that can contain properties.
-
+        if (!gd::EventsPropertyReplacer::CanContainProperty(
+          parameterMetadata.GetValueTypeMetadata())) {
+          return;
+        }
         auto node = parameterValue.GetRootNode();
         if (node) {
-          ExpressionPropertyReplacer renamer(platform,
-                                             GetProjectScopedContainers(),
-                                             targetPropertiesContainer,
-                                             oldToNewPropertyNames,
-                                             removedPropertyNames);
+          ExpressionPropertyReplacer renamer(
+              platform, GetProjectScopedContainers(), targetPropertiesContainer,
+              parameterMetadata.GetValueTypeMetadata().IsVariableOnly(),
+              oldToNewPropertyNames, removedPropertyNames);
           node->Visit(renamer);
 
           if (renamer.IsRemovedPropertyUsed()) {
@@ -246,20 +249,16 @@ bool EventsPropertyReplacer::DoVisitInstruction(gd::Instruction& instruction,
 
 bool EventsPropertyReplacer::DoVisitEventExpression(
     gd::Expression& expression, const gd::ParameterMetadata& metadata) {
-  const gd::String& type = metadata.GetType();
-
-  if (!gd::ParameterMetadata::IsExpression("variable", type) &&
-      !gd::ParameterMetadata::IsExpression("number", type) &&
-      !gd::ParameterMetadata::IsExpression("string", type))
-    return false;  // Not an expression that can contain properties.
-
+  if (!gd::EventsPropertyReplacer::CanContainProperty(
+          metadata.GetValueTypeMetadata())) {
+    return false;
+  }
   auto node = expression.GetRootNode();
   if (node) {
-    ExpressionPropertyReplacer renamer(platform,
-                                       GetProjectScopedContainers(),
-                                       targetPropertiesContainer,
-                                       oldToNewPropertyNames,
-                                       removedPropertyNames);
+    ExpressionPropertyReplacer renamer(
+        platform, GetProjectScopedContainers(), targetPropertiesContainer,
+        metadata.GetValueTypeMetadata().IsVariableOnly(), oldToNewPropertyNames,
+        removedPropertyNames);
     node->Visit(renamer);
 
     if (renamer.IsRemovedPropertyUsed()) {
@@ -272,6 +271,12 @@ bool EventsPropertyReplacer::DoVisitEventExpression(
   return false;
 }
 
+bool EventsPropertyReplacer::CanContainProperty(
+    const gd::ValueTypeMetadata &valueTypeMetadata) {
+  return valueTypeMetadata.IsVariable() || valueTypeMetadata.IsNumber() ||
+         valueTypeMetadata.IsString();
+}
+
 EventsPropertyReplacer::~EventsPropertyReplacer() {}
 
 }  // namespace gd

Core/GDCore/IDE/Events/EventsPropertyReplacer.h

@@ -4,6 +4,7 @@
  * reserved. This project is released under the MIT License.
  */
 #pragma once
+
 #include <map>
 #include <memory>
 #include <unordered_map>
@@ -41,6 +42,8 @@ class GD_CORE_API EventsPropertyReplacer
         removedPropertyNames(removedPropertyNames_){};
   virtual ~EventsPropertyReplacer();
 
+  static bool CanContainProperty(const gd::ValueTypeMetadata &valueTypeMetadata);
+
  private:
   bool DoVisitInstruction(gd::Instruction &instruction,
                           bool isCondition) override;

Core/GDCore/IDE/Events/EventsRefactorer.cpp

@@ -22,6 +22,7 @@
 #include "GDCore/Project/EventsBasedObject.h"
 #include "GDCore/Project/ProjectScopedContainers.h"
 #include "GDCore/IDE/Events/ExpressionTypeFinder.h"
+#include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
 
 using namespace std;
 
@@ -51,17 +52,17 @@ class GD_CORE_API ExpressionObjectRenamer : public ExpressionParser2NodeWorker {
 
   static bool Rename(const gd::Platform &platform,
                      const gd::ProjectScopedContainers &projectScopedContainers,
-                     const gd::String &rootType,
-                     gd::ExpressionNode& node,
-                     const gd::String& objectName,
-                     const gd::String& objectNewName) {
-    if (gd::ExpressionValidator::HasNoErrors(platform, projectScopedContainers, rootType, node)) {
-      ExpressionObjectRenamer renamer(platform, projectScopedContainers, rootType, objectName, objectNewName);
+                     const gd::String &rootType, gd::ExpressionNode &node,
+                     const gd::String &objectName,
+                     const gd::String &objectNewName) {
+    if (gd::ExpressionValidator::HasNoErrors(platform, projectScopedContainers,
+                                             rootType, node)) {
+      ExpressionObjectRenamer renamer(platform, projectScopedContainers,
+                                      rootType, objectName, objectNewName);
       node.Visit(renamer);
 
       return renamer.HasDoneRenaming();
     }
-
     return false;
   }
 
@@ -83,7 +84,7 @@ class GD_CORE_API ExpressionObjectRenamer : public ExpressionParser2NodeWorker {
   void OnVisitVariableNode(VariableNode& node) override {
     auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers, rootType, node);
 
-    if (gd::ValueTypeMetadata::IsTypeLegacyPreScopedVariable(type)) {
+    if (gd::ValueTypeMetadata::IsVariable(type)) {
       // Nothing to do (this can't reference an object)
     } else {
       if (node.name == objectName) {
@@ -119,7 +120,7 @@ class GD_CORE_API ExpressionObjectRenamer : public ExpressionParser2NodeWorker {
         node.identifierName == objectName) {
       hasDoneRenaming = true;
       node.identifierName = objectNewName;
-    } else if (gd::ValueTypeMetadata::IsTypeLegacyPreScopedVariable(type)) {
+    } else if (gd::ValueTypeMetadata::IsVariable(type)) {
       // Nothing to do (this can't reference an object)
     } else {
       if (node.identifierName == objectName) {
@@ -295,187 +296,118 @@ class GD_CORE_API ExpressionObjectFinder : public ExpressionParser2NodeWorker {
   const gd::String rootType;
 };
 
-bool EventsRefactorer::RenameObjectInActions(const gd::Platform& platform,
-                                             gd::ProjectScopedContainers& projectScopedContainers,
-                                             gd::InstructionsList& actions,
-                                             gd::String oldName,
-                                             gd::String newName) {
-  bool somethingModified = false;
+/**
+ * \brief Replace in expressions and in parameters of actions or conditions,
+ * references to the name of an object by another.
+ *
+ * \ingroup IDE
+ */
+class GD_CORE_API EventsObjectReplacer
+    : public ArbitraryEventsWorkerWithContext {
+public:
+  EventsObjectReplacer(const gd::Platform &platform_,
+                       const gd::ObjectsContainer &targetedObjectsContainer_,
+                       const gd::String &oldObjectName_,
+                       const gd::String &newObjectName_)
+      : platform(platform_),
+        targetedObjectsContainer(targetedObjectsContainer_),
+        oldObjectName(oldObjectName_), newObjectName(newObjectName_){};
 
-  for (std::size_t aId = 0; aId < actions.size(); ++aId) {
-    const gd::InstructionMetadata& instrInfos =
-        MetadataProvider::GetActionMetadata(platform, actions[aId].GetType());
-    for (std::size_t pNb = 0; pNb < instrInfos.parameters.size(); ++pNb) {
-      // Replace object's name in parameters
-      if (gd::ParameterMetadata::IsObject(instrInfos.parameters[pNb].GetType()) &&
-          actions[aId].GetParameter(pNb).GetPlainString() == oldName)
-        actions[aId].SetParameter(pNb, gd::Expression(newName));
-      // Replace object's name in expressions
-      else if (ParameterMetadata::IsExpression(
-                   "number", instrInfos.parameters[pNb].GetType())) {
-        auto node = actions[aId].GetParameter(pNb).GetRootNode();
+  virtual ~EventsObjectReplacer() {}
 
-        if (ExpressionObjectRenamer::Rename(platform, projectScopedContainers, "number", *node, oldName, newName)) {
-          actions[aId].SetParameter(
-              pNb, ExpressionParser2NodePrinter::PrintNode(*node));
-        }
-      }
-      // Replace object's name in text expressions
-      else if (ParameterMetadata::IsExpression(
-                   "string", instrInfos.parameters[pNb].GetType())) {
-        auto node = actions[aId].GetParameter(pNb).GetRootNode();
-
-        if (ExpressionObjectRenamer::Rename(platform, projectScopedContainers, "string", *node, oldName, newName)) {
-          actions[aId].SetParameter(
-              pNb, ExpressionParser2NodePrinter::PrintNode(*node));
-        }
-      }
+private:
+  bool DoVisitInstruction(gd::Instruction &instruction,
+                          bool isCondition) override {
+    if (&targetedObjectsContainer !=
+        GetProjectScopedContainers()
+            .GetObjectsContainersList()
+            .GetObjectsContainerFromObjectName(oldObjectName)) {
+      return false;
     }
+    const auto &metadata = isCondition
+                               ? gd::MetadataProvider::GetConditionMetadata(
+                                     platform, instruction.GetType())
+                               : gd::MetadataProvider::GetActionMetadata(
+                                     platform, instruction.GetType());
 
-    if (!actions[aId].GetSubInstructions().empty())
-      somethingModified =
-          RenameObjectInActions(platform,
-                                projectScopedContainers,
-                                actions[aId].GetSubInstructions(),
-                                oldName,
-                                newName) ||
-          somethingModified;
+    gd::ParameterMetadataTools::IterateOverParametersWithIndex(
+        instruction.GetParameters(), metadata.GetParameters(),
+        [&](const gd::ParameterMetadata &parameterMetadata,
+            const gd::Expression &parameterValue, size_t parameterIndex,
+            const gd::String &lastObjectName) {
+          if (!gd::EventsObjectReplacer::CanContainObject(
+                  parameterMetadata.GetValueTypeMetadata())) {
+            return;
+          }
+          auto node = parameterValue.GetRootNode();
+          if (node) {
+            ExpressionObjectRenamer renamer(
+                platform, GetProjectScopedContainers(),
+                parameterMetadata.GetValueTypeMetadata().GetName(),
+                oldObjectName, newObjectName);
+            node->Visit(renamer);
+
+            if (renamer.HasDoneRenaming()) {
+              instruction.SetParameter(
+                  parameterIndex,
+                  ExpressionParser2NodePrinter::PrintNode(*node));
+            }
+          }
+        });
+
+    return false;
   }
 
-  return somethingModified;
-}
-
-bool EventsRefactorer::RenameObjectInConditions(
-    const gd::Platform& platform,
-    gd::ProjectScopedContainers& projectScopedContainers,
-    gd::InstructionsList& conditions,
-    gd::String oldName,
-    gd::String newName) {
-  bool somethingModified = false;
-
-  for (std::size_t cId = 0; cId < conditions.size(); ++cId) {
-    const gd::InstructionMetadata& instrInfos =
-        MetadataProvider::GetConditionMetadata(platform,
-                                               conditions[cId].GetType());
-    for (std::size_t pNb = 0; pNb < instrInfos.parameters.size(); ++pNb) {
-      // Replace object's name in parameters
-      if (gd::ParameterMetadata::IsObject(instrInfos.parameters[pNb].GetType()) &&
-          conditions[cId].GetParameter(pNb).GetPlainString() == oldName)
-        conditions[cId].SetParameter(pNb, gd::Expression(newName));
-      // Replace object's name in expressions
-      else if (ParameterMetadata::IsExpression(
-                   "number", instrInfos.parameters[pNb].GetType())) {
-        auto node = conditions[cId].GetParameter(pNb).GetRootNode();
-
-        if (ExpressionObjectRenamer::Rename(platform, projectScopedContainers, "number", *node, oldName, newName)) {
-          conditions[cId].SetParameter(
-              pNb, ExpressionParser2NodePrinter::PrintNode(*node));
-        }
-      }
-      // Replace object's name in text expressions
-      else if (ParameterMetadata::IsExpression(
-                   "string", instrInfos.parameters[pNb].GetType())) {
-        auto node = conditions[cId].GetParameter(pNb).GetRootNode();
-
-        if (ExpressionObjectRenamer::Rename(platform, projectScopedContainers, "string", *node, oldName, newName)) {
-          conditions[cId].SetParameter(
-              pNb, ExpressionParser2NodePrinter::PrintNode(*node));
-        }
-      }
+  bool DoVisitEventExpression(gd::Expression &expression,
+                              const gd::ParameterMetadata &metadata) override {
+    if (&targetedObjectsContainer !=
+        GetProjectScopedContainers()
+            .GetObjectsContainersList()
+            .GetObjectsContainerFromObjectName(oldObjectName)) {
+      return false;
+    }
+    if (!gd::EventsObjectReplacer::CanContainObject(
+            metadata.GetValueTypeMetadata())) {
+      return false;
     }
-
-    if (!conditions[cId].GetSubInstructions().empty())
-      somethingModified =
-          RenameObjectInConditions(platform,
-                                   projectScopedContainers,
-                                   conditions[cId].GetSubInstructions(),
-                                   oldName,
-                                   newName) ||
-          somethingModified;
-  }
-
-  return somethingModified;
-}
-
-bool EventsRefactorer::RenameObjectInEventParameters(
-    const gd::Platform& platform,
-    gd::ProjectScopedContainers& projectScopedContainers,
-    gd::Expression& expression,
-    gd::ParameterMetadata parameterMetadata,
-    gd::String oldName,
-    gd::String newName) {
-  bool somethingModified = false;
-
-  if (gd::ParameterMetadata::IsObject(parameterMetadata.GetType()) &&
-      expression.GetPlainString() == oldName)
-    expression = gd::Expression(newName);
-  // Replace object's name in expressions
-  else if (ParameterMetadata::IsExpression("number",
-                                           parameterMetadata.GetType())) {
     auto node = expression.GetRootNode();
+    if (node) {
+      ExpressionObjectRenamer renamer(platform, GetProjectScopedContainers(),
+                                      metadata.GetValueTypeMetadata().GetName(),
+                                      oldObjectName, newObjectName);
+      node->Visit(renamer);
 
-    if (ExpressionObjectRenamer::Rename(platform, projectScopedContainers, "number", *node, oldName, newName)) {
-      expression = ExpressionParser2NodePrinter::PrintNode(*node);
+      if (renamer.HasDoneRenaming()) {
+        expression = ExpressionParser2NodePrinter::PrintNode(*node);
+      }
     }
-  }
-  // Replace object's name in text expressions
-  else if (ParameterMetadata::IsExpression("string",
-                                           parameterMetadata.GetType())) {
-    auto node = expression.GetRootNode();
 
-    if (ExpressionObjectRenamer::Rename(platform, projectScopedContainers, "string", *node, oldName, newName)) {
-      expression = ExpressionParser2NodePrinter::PrintNode(*node);
-    }
+    return false;
   }
 
-  return somethingModified;
-}
+  bool CanContainObject(const gd::ValueTypeMetadata &valueTypeMetadata) {
+    return valueTypeMetadata.IsObject() || valueTypeMetadata.IsVariable() ||
+           valueTypeMetadata.IsNumber() || valueTypeMetadata.IsString();
+  }
+
+  const gd::Platform &platform;
+  const gd::ObjectsContainer &targetedObjectsContainer;
+  const gd::String &oldObjectName;
+  const gd::String &newObjectName;
+};
 
 void EventsRefactorer::RenameObjectInEvents(const gd::Platform& platform,
-                                            gd::ProjectScopedContainers& projectScopedContainers,
+                                            const gd::ProjectScopedContainers& projectScopedContainers,
                                             gd::EventsList& events,
+                                            const gd::ObjectsContainer &targetedObjectsContainer,
                                             gd::String oldName,
                                             gd::String newName) {
-  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 somethingModified = RenameObjectInConditions(
-          platform, projectScopedContainers, *conditionsVectors[j], oldName, newName);
-    }
-
-    vector<gd::InstructionsList*> actionsVectors =
-        events[i].GetAllActionsVectors();
-    for (std::size_t j = 0; j < actionsVectors.size(); ++j) {
-      bool somethingModified = RenameObjectInActions(
-          platform, projectScopedContainers, *actionsVectors[j], oldName, newName);
-    }
-
-    vector<pair<gd::Expression*, gd::ParameterMetadata>>
-        expressionsWithMetadata = events[i].GetAllExpressionsWithMetadata();
-    for (std::size_t j = 0; j < expressionsWithMetadata.size(); ++j) {
-      gd::Expression* expression = expressionsWithMetadata[j].first;
-      gd::ParameterMetadata parameterMetadata =
-          expressionsWithMetadata[j].second;
-      bool somethingModified = RenameObjectInEventParameters(platform,
-                                                             projectScopedContainers,
-                                                             *expression,
-                                                             parameterMetadata,
-                                                             oldName,
-                                                             newName);
-    }
-
-    if (events[i].CanHaveSubEvents())
-      RenameObjectInEvents(platform,
-                           projectScopedContainers,
-                           events[i].GetSubEvents(),
-                           oldName,
-                           newName);
-  }
+  gd::EventsObjectReplacer eventsParameterReplacer(platform, targetedObjectsContainer, oldName, newName);
+  eventsParameterReplacer.Launch(events, projectScopedContainers);
 }
 
 bool EventsRefactorer::RemoveObjectInActions(const gd::Platform& platform,
-                                             gd::ProjectScopedContainers& projectScopedContainers,
+                                             const gd::ProjectScopedContainers& projectScopedContainers,
                                              gd::InstructionsList& actions,
                                              gd::String name) {
   bool somethingModified = false;
@@ -485,16 +417,16 @@ bool EventsRefactorer::RemoveObjectInActions(const gd::Platform& platform,
 
     const gd::InstructionMetadata& instrInfos =
         MetadataProvider::GetActionMetadata(platform, actions[aId].GetType());
-    for (std::size_t pNb = 0; pNb < instrInfos.parameters.size(); ++pNb) {
+    for (std::size_t pNb = 0; pNb < instrInfos.parameters.GetParametersCount(); ++pNb) {
       // Find object's name in parameters
-      if (gd::ParameterMetadata::IsObject(instrInfos.parameters[pNb].GetType()) &&
+      if (gd::ParameterMetadata::IsObject(instrInfos.parameters.GetParameter(pNb).GetType()) &&
           actions[aId].GetParameter(pNb).GetPlainString() == name) {
         deleteMe = true;
         break;
       }
       // Find object's name in expressions
       else if (ParameterMetadata::IsExpression(
-                   "number", instrInfos.parameters[pNb].GetType())) {
+                   "number", instrInfos.parameters.GetParameter(pNb).GetType())) {
         auto node = actions[aId].GetParameter(pNb).GetRootNode();
 
         if (ExpressionObjectFinder::CheckIfHasObject(platform, projectScopedContainers, "number", *node, name)) {
@@ -504,7 +436,7 @@ bool EventsRefactorer::RemoveObjectInActions(const gd::Platform& platform,
       }
       // Find object's name in text expressions
       else if (ParameterMetadata::IsExpression(
-                   "string", instrInfos.parameters[pNb].GetType())) {
+                   "string", instrInfos.parameters.GetParameter(pNb).GetType())) {
         auto node = actions[aId].GetParameter(pNb).GetRootNode();
 
         if (ExpressionObjectFinder::CheckIfHasObject(platform, projectScopedContainers, "string", *node, name)) {
@@ -532,7 +464,7 @@ bool EventsRefactorer::RemoveObjectInActions(const gd::Platform& platform,
 
 bool EventsRefactorer::RemoveObjectInConditions(
     const gd::Platform& platform,
-    gd::ProjectScopedContainers& projectScopedContainers,
+    const gd::ProjectScopedContainers& projectScopedContainers,
     gd::InstructionsList& conditions,
     gd::String name) {
   bool somethingModified = false;
@@ -543,16 +475,16 @@ bool EventsRefactorer::RemoveObjectInConditions(
     const gd::InstructionMetadata& instrInfos =
         MetadataProvider::GetConditionMetadata(platform,
                                                conditions[cId].GetType());
-    for (std::size_t pNb = 0; pNb < instrInfos.parameters.size(); ++pNb) {
+    for (std::size_t pNb = 0; pNb < instrInfos.parameters.GetParametersCount(); ++pNb) {
       // Find object's name in parameters
-      if (gd::ParameterMetadata::IsObject(instrInfos.parameters[pNb].GetType()) &&
+      if (gd::ParameterMetadata::IsObject(instrInfos.parameters.GetParameter(pNb).GetType()) &&
           conditions[cId].GetParameter(pNb).GetPlainString() == name) {
         deleteMe = true;
         break;
       }
       // Find object's name in expressions
       else if (ParameterMetadata::IsExpression(
-                   "number", instrInfos.parameters[pNb].GetType())) {
+                   "number", instrInfos.parameters.GetParameter(pNb).GetType())) {
         auto node = conditions[cId].GetParameter(pNb).GetRootNode();
 
         if (ExpressionObjectFinder::CheckIfHasObject(platform, projectScopedContainers, "number", *node, name)) {
@@ -562,7 +494,7 @@ bool EventsRefactorer::RemoveObjectInConditions(
       }
       // Find object's name in text expressions
       else if (ParameterMetadata::IsExpression(
-                   "string", instrInfos.parameters[pNb].GetType())) {
+                   "string", instrInfos.parameters.GetParameter(pNb).GetType())) {
         auto node = conditions[cId].GetParameter(pNb).GetRootNode();
 
         if (ExpressionObjectFinder::CheckIfHasObject(platform, projectScopedContainers, "string", *node, name)) {
@@ -588,31 +520,6 @@ 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

@@ -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_EVENTSREFACTORER_H
-#define GDCORE_EVENTSREFACTORER_H
+#pragma once
+
 #include <memory>
 #include <vector>
 
@@ -81,19 +81,12 @@ class GD_CORE_API EventsRefactorer {
    * events ).
    */
   static void RenameObjectInEvents(const gd::Platform& platform,
-                                   gd::ProjectScopedContainers& projectScopedContainers,
+                                   const gd::ProjectScopedContainers& projectScopedContainers,
                                    gd::EventsList& events,
+                                   const gd::ObjectsContainer &targetedObjectsContainer,
                                    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
    *
@@ -129,51 +122,13 @@ class GD_CORE_API EventsRefactorer {
   virtual ~EventsRefactorer(){};
 
  private:
-  /**
-   * Replace all occurrences of an object name by another name in an action
-   * ( include : objects in parameters and in math/text expressions ).
-   *
-   * \return true if something was modified.
-   */
-  static bool RenameObjectInActions(const gd::Platform& platform,
-                                    gd::ProjectScopedContainers& projectScopedContainers,
-                                    gd::InstructionsList& instructions,
-                                    gd::String oldName,
-                                    gd::String newName);
-
-  /**
-   * Replace all occurrences of an object name by another name in a condition
-   * ( include : objects in parameters and in math/text expressions ).
-   *
-   * \return true if something was modified.
-   */
-  static bool RenameObjectInConditions(const gd::Platform& platform,
-                                       gd::ProjectScopedContainers& projectScopedContainers,
-                                       gd::InstructionsList& instructions,
-                                       gd::String oldName,
-                                       gd::String newName);
-  /**
-   * Replace all occurrences of an object name by another name in an expression
-   * with the specified metadata
-   * ( include : objects or objects in math/text expressions ).
-   *
-   * \return true if something was modified.
-   */
-  static bool RenameObjectInEventParameters(
-      const gd::Platform& platform,
-      gd::ProjectScopedContainers& projectScopedContainers,
-      gd::Expression& expression,
-      gd::ParameterMetadata parameterMetadata,
-      gd::String oldName,
-      gd::String newName);
-
   /**
    * Remove all conditions of the list using an object
    *
    * \return true if something was modified.
    */
   static bool RemoveObjectInConditions(const gd::Platform& platform,
-                                       gd::ProjectScopedContainers& projectScopedContainers,
+                                       const gd::ProjectScopedContainers& projectScopedContainers,
                                        gd::InstructionsList& conditions,
                                        gd::String name);
 
@@ -183,7 +138,7 @@ class GD_CORE_API EventsRefactorer {
    * \return true if something was modified.
    */
   static bool RemoveObjectInActions(const gd::Platform& platform,
-                                    gd::ProjectScopedContainers& projectScopedContainers,
+                                    const gd::ProjectScopedContainers& projectScopedContainers,
                                     gd::InstructionsList& conditions,
                                     gd::String name);
 
@@ -250,5 +205,3 @@ class GD_CORE_API EventsRefactorer {
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_EVENTSREFACTORER_H

Core/GDCore/IDE/Events/EventsVariableInstructionTypeSwitcher.cpp

@@ -0,0 +1,108 @@
+/*
+ * 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 {
+
+VariablesContainer EventsVariableInstructionTypeSwitcher::nullVariablesContainer;
+
+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 (type == "variableOrProperty") {
+            variablesContainer =
+                &GetProjectScopedContainers()
+                      .GetVariablesContainersList()
+                      .GetVariablesContainerFromVariableOrPropertyName(variableName);
+        } else {
+          if (GetProjectScopedContainers().GetVariablesContainersList().Has(
+                  variableName)) {
+            variablesContainer =
+                &GetProjectScopedContainers()
+                      .GetVariablesContainersList()
+                      .GetVariablesContainerFromVariableOrPropertyOrParameterName(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 ||
+            lastObjectName == groupName) {
+          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 +1,68 @@
+/*
+ * 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 std::unordered_set<gd::String> &typeChangedVariableNames_,
+      const gd::VariablesContainer &targetVariablesContainer_)
+      : platform(platform_),
+        typeChangedVariableNames(typeChangedVariableNames_),
+        targetVariablesContainer(targetVariablesContainer_), groupName(""){};
+  EventsVariableInstructionTypeSwitcher(
+      const gd::Platform &platform_,
+      const std::unordered_set<gd::String> &typeChangedVariableNames_,
+      const gd::String &groupName_)
+      : platform(platform_),
+        typeChangedVariableNames(typeChangedVariableNames_),
+        targetVariablesContainer(nullVariablesContainer),
+        groupName(groupName_){};
+  virtual ~EventsVariableInstructionTypeSwitcher();
+
+private:
+  bool DoVisitInstruction(gd::Instruction &instruction,
+                          bool isCondition) override;
+
+  const gd::Platform &platform;
+  const gd::VariablesContainer &targetVariablesContainer;
+  /**
+   * Groups don't have VariablesContainer, so `targetVariablesContainer` will be
+   * pointing to `nullVariablesContainer` and the group name is use instead to
+   * check which instruction to modify.
+   */
+  const gd::String groupName;
+  const std::unordered_set<gd::String> &typeChangedVariableNames;
+
+  static VariablesContainer nullVariablesContainer;
+};
+
+} // 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"
@@ -29,6 +32,8 @@
 
 namespace gd {
 
+VariablesContainer EventsVariableReplacer::nullVariablesContainer;
+
 /**
  * \brief Go through the nodes and rename variables,
  * or signal if the instruction must be renamed if a removed variable is used.
@@ -41,22 +46,26 @@ class GD_CORE_API ExpressionVariableReplacer
   ExpressionVariableReplacer(
       const gd::Platform& platform_,
       const gd::ProjectScopedContainers& projectScopedContainers_,
+      const VariablesRenamingChangesetNode& variablesRenamingChangesetRoot_,
+      const std::unordered_set<gd::String>& removedVariableNames_,
       const gd::VariablesContainer& targetVariablesContainer_,
-      const std::unordered_map<gd::String, gd::String>& oldToNewVariableNames_,
-      const std::unordered_set<gd::String>& removedVariableNames_)
+      const gd::String &groupName_,
+      const gd::String &forcedInitialObjectName)
       : hasDoneRenaming(false),
         removedVariableUsed(false),
         platform(platform_),
         projectScopedContainers(projectScopedContainers_),
-        forcedInitialVariablesContainer(nullptr),
+        forcedVariablesContainer(nullptr),
+        forcedObjectName(forcedInitialObjectName),
+        variablesRenamingChangesetRoot(variablesRenamingChangesetRoot_),
+        removedVariableNames(removedVariableNames_),
         targetVariablesContainer(targetVariablesContainer_),
-        oldToNewVariableNames(oldToNewVariableNames_),
-        removedVariableNames(removedVariableNames_){};
+        targetGroupName(groupName_){};
   virtual ~ExpressionVariableReplacer(){};
 
   void SetForcedInitialVariablesContainer(
       const gd::VariablesContainer* forcedInitialVariablesContainer_) {
-    forcedInitialVariablesContainer = forcedInitialVariablesContainer_;
+    forcedVariablesContainer = forcedInitialVariablesContainer_;
   }
 
   bool HasDoneRenaming() const { return hasDoneRenaming; }
@@ -79,21 +88,30 @@ class GD_CORE_API ExpressionVariableReplacer
     // The node represents a variable or an object name on which a variable
     // will be accessed.
 
-    if (forcedInitialVariablesContainer) {
+    if (forcedVariablesContainer) {
+      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) {
+      if (forcedVariablesContainer == &targetVariablesContainer ||
+          IsTargetingObjectGroup(forcedObjectName)) {
         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 +121,21 @@ class GD_CORE_API ExpressionVariableReplacer
         },
         [&]() {
           // This is a variable.
-          if (projectScopedContainers.GetVariablesContainersList()
-                  .HasVariablesContainer(targetVariablesContainer)) {
+          if (&projectScopedContainers.GetVariablesContainersList()
+                   .GetVariablesContainerFromVariableOrPropertyOrParameterName(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 +146,7 @@ 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 +154,50 @@ 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, targetVariablesContainer) ||
+          IsTargetingObjectGroup(objectNameToUseForVariableAccessor)) {
+        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();
 
@@ -162,11 +205,12 @@ class GD_CORE_API ExpressionVariableReplacer
     // (and if it's a variable reference or a value does not have any importance
     // here).
 
-    if (forcedInitialVariablesContainer) {
+    if (forcedVariablesContainer) {
       // A scope was forced. Honor it: it means this node represents a variable
       // of the forced variables container.
-      if (forcedInitialVariablesContainer == &targetVariablesContainer) {
-        RenameOrRemoveVariableOfTargetVariableContainer(node.identifierName);
+      if (forcedVariablesContainer == &targetVariablesContainer ||
+          IsTargetingObjectGroup(forcedObjectName)) {
+        renameVariableAndChild();
       }
       return;
     }
@@ -174,25 +218,28 @@ 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)) {
+                  node.identifierName, targetVariablesContainer) ||
+              IsTargetingObjectGroup(node.identifierName)) {
             // 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()
+                   .GetVariablesContainerFromVariableOrPropertyOrParameterName(
+                       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 +249,7 @@ 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 {}
@@ -231,31 +271,33 @@ class GD_CORE_API ExpressionVariableReplacer
       // force the "scope" at which starts the evalution of variables.
       if (parameterMetadata && parameterMetadata->GetValueTypeMetadata()
                                    .IsLegacyPreScopedVariable()) {
-        const gd::VariablesContainer* oldForcedInitialVariablesContainer =
-            forcedInitialVariablesContainer;
+        const gd::VariablesContainer *oldForcedVariablesContainer =
+            forcedVariablesContainer;
+        const gd::String &oldForcedObjectName = forcedObjectName;
 
-        forcedInitialVariablesContainer = nullptr;
+        forcedVariablesContainer = nullptr;
+        forcedObjectName = "";
         if (parameterMetadata->GetType() == "globalvar") {
-          forcedInitialVariablesContainer =
+          forcedVariablesContainer =
               projectScopedContainers.GetVariablesContainersList()
                   .GetTopMostVariablesContainer();
         } else if (parameterMetadata->GetType() == "scenevar") {
-          forcedInitialVariablesContainer =
+          forcedVariablesContainer =
               projectScopedContainers.GetVariablesContainersList()
                   .GetBottomMostVariablesContainer();
         } else if (parameterMetadata->GetType() == "objectvar") {
           auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(
-              platform,
-              projectScopedContainers.GetObjectsContainersList(),
-              node.objectName,
-              *node.parameters[parameterIndex].get());
-          forcedInitialVariablesContainer =
+              platform, projectScopedContainers.GetObjectsContainersList(),
+              node.objectName, *node.parameters[parameterIndex].get());
+          forcedVariablesContainer =
               projectScopedContainers.GetObjectsContainersList()
                   .GetObjectOrGroupVariablesContainer(objectName);
+          forcedObjectName = objectName;
         }
 
         node.parameters[parameterIndex]->Visit(*this);
-        forcedInitialVariablesContainer = oldForcedInitialVariablesContainer;
+        forcedVariablesContainer = oldForcedVariablesContainer;
+        forcedObjectName = oldForcedObjectName;
       } else {
         // For any other parameter, there is no special treatment being needed.
         node.parameters[parameterIndex]->Visit(*this);
@@ -268,19 +310,28 @@ 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 IsTargetingObjectGroup(const gd::String &objectGroupName) {
+    return !targetGroupName.empty() && objectGroupName == targetGroupName;
   }
 
   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;
     }
@@ -288,24 +339,88 @@ 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;
-  const gd::VariablesContainer* forcedInitialVariablesContainer;
+  const gd::VariablesContainer* forcedVariablesContainer;
+  gd::String forcedObjectName;
 
   // Renaming or removing to do:
   const gd::VariablesContainer& targetVariablesContainer;
-  const std::unordered_map<gd::String, gd::String>& oldToNewVariableNames;
+  /**
+   * Groups don't have VariablesContainer, so `targetVariablesContainer` will be
+   * pointing to `nullVariablesContainer` and the group name is use instead to
+   * check which variable accesses to modify in expressions.
+   */
+  const gd::String& targetGroupName;
+  const VariablesRenamingChangesetNode &variablesRenamingChangesetRoot;
   const std::unordered_set<gd::String>& removedVariableNames;
 
   gd::String objectNameToUseForVariableAccessor;
+  std::vector<const VariablesRenamingChangesetNode*> variablesRenamingChangesetNodeStack;
 };
 
 const gd::VariablesContainer*
 EventsVariableReplacer::FindForcedVariablesContainerIfAny(
     const gd::String& type, const gd::String& lastObjectName) {
   // Handle legacy pre-scoped variable parameters: in this case, we
-  // force the "scope" at which starts the evalution of variables.
+  // force the "scope" at which starts the evaluation of variables.
   if (type == "objectvar") {
     return GetProjectScopedContainers()
         .GetObjectsContainersList()
@@ -350,9 +465,11 @@ bool EventsVariableReplacer::DoVisitInstruction(gd::Instruction& instruction,
         if (node) {
           ExpressionVariableReplacer renamer(platform,
                                              GetProjectScopedContainers(),
+                                             variablesRenamingChangesetRoot,
+                                             removedVariableNames,
                                              targetVariablesContainer,
-                                             oldToNewVariableNames,
-                                             removedVariableNames);
+                                             targetGroupName,
+                                             type == "objectvar" ? lastObjectName : "");
           renamer.SetForcedInitialVariablesContainer(
               FindForcedVariablesContainerIfAny(type, lastObjectName));
           node->Visit(renamer);
@@ -382,9 +499,11 @@ bool EventsVariableReplacer::DoVisitEventExpression(
   if (node) {
     ExpressionVariableReplacer renamer(platform,
                                        GetProjectScopedContainers(),
+                                       variablesRenamingChangesetRoot,
+                                       removedVariableNames,
                                        targetVariablesContainer,
-                                       oldToNewVariableNames,
-                                       removedVariableNames);
+                                       targetGroupName,
+                                       "");
     renamer.SetForcedInitialVariablesContainer(
         FindForcedVariablesContainerIfAny(type, ""));
     node->Visit(renamer);

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 {
@@ -32,13 +35,24 @@ class GD_CORE_API EventsVariableReplacer
  public:
   EventsVariableReplacer(
       const gd::Platform &platform_,
-      const gd::VariablesContainer &targetVariablesContainer_,
-      const std::unordered_map<gd::String, gd::String> &oldToNewVariableNames_,
-      const std::unordered_set<gd::String> &removedVariableNames_)
+      const VariablesRenamingChangesetNode &variablesRenamingChangesetRoot_,
+      const std::unordered_set<gd::String> &removedVariableNames_,
+      const gd::VariablesContainer &targetVariablesContainer_)
       : platform(platform_),
+        variablesRenamingChangesetRoot(variablesRenamingChangesetRoot_),
+        removedVariableNames(removedVariableNames_),
         targetVariablesContainer(targetVariablesContainer_),
-        oldToNewVariableNames(oldToNewVariableNames_),
-        removedVariableNames(removedVariableNames_){};
+        targetGroupName("") {};
+  EventsVariableReplacer(
+      const gd::Platform &platform_,
+      const VariablesRenamingChangesetNode &variablesRenamingChangesetRoot_,
+      const std::unordered_set<gd::String> &removedVariableNames_,
+      const gd::String &targetGroupName_)
+      : platform(platform_),
+        variablesRenamingChangesetRoot(variablesRenamingChangesetRoot_),
+        removedVariableNames(removedVariableNames_),
+        targetVariablesContainer(nullVariablesContainer),
+        targetGroupName(targetGroupName_) {};
   virtual ~EventsVariableReplacer();
 
  private:
@@ -52,9 +66,16 @@ 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;
+  /**
+   * Groups don't have VariablesContainer, so `targetVariablesContainer` will be
+   * pointing to `nullVariablesContainer` and the group name is use instead to
+   * check which variable accesses to modify in expressions.
+   */
+  const gd::String targetGroupName;
+  const VariablesRenamingChangesetNode &variablesRenamingChangesetRoot;
   const std::unordered_set<gd::String> &removedVariableNames;
+
+  static VariablesContainer nullVariablesContainer;
 };
 
 }  // namespace gd

Core/GDCore/IDE/Events/EventsVariablesFinder.cpp

@@ -93,9 +93,11 @@ class GD_CORE_API VariableFinderExpressionNodeWorker
     }
 
     size_t parameterIndex = 0;
-    for (size_t metadataIndex = (isObjectFunction ? 1 : 0); metadataIndex < metadata.parameters.size()
-      && parameterIndex < node.parameters.size(); ++metadataIndex) {
-      auto& parameterMetadata = metadata.parameters[metadataIndex];
+    for (size_t metadataIndex = (isObjectFunction ? 1 : 0);
+         metadataIndex < metadata.GetParameters().GetParametersCount() &&
+         parameterIndex < node.parameters.size();
+         ++metadataIndex) {
+      auto& parameterMetadata = metadata.GetParameters().GetParameter(metadataIndex);
       if (parameterMetadata.IsCodeOnly()) {
         continue;
       }
@@ -150,18 +152,18 @@ class GD_CORE_API VariableFinderEventWorker
                               platform, instruction.GetType())
                         : MetadataProvider::GetActionMetadata(
                               platform, instruction.GetType());
-      for (std::size_t pNb = 0; pNb < instrInfos.parameters.size(); ++pNb) {
+      for (std::size_t pNb = 0; pNb < instrInfos.parameters.GetParametersCount(); ++pNb) {
         // The parameter has the searched type...
-        if (instrInfos.parameters[pNb].GetType() == parameterType) {
+        if (instrInfos.parameters.GetParameter(pNb).GetType() == parameterType) {
           //...remember the value of the parameter.
           if (objectName.empty() || lastObjectParameter == objectName)
             results.insert(instruction.GetParameter(pNb).GetPlainString());
         }
         // Search in expressions
         else if (ParameterMetadata::IsExpression(
-                    "number", instrInfos.parameters[pNb].GetType()) ||
+                    "number", instrInfos.parameters.GetParameter(pNb).GetType()) ||
                 ParameterMetadata::IsExpression(
-                    "string", instrInfos.parameters[pNb].GetType())) {
+                    "string", instrInfos.parameters.GetParameter(pNb).GetType())) {
           auto node = instruction.GetParameter(pNb).GetRootNode();
 
           VariableFinderExpressionNodeWorker searcher(
@@ -174,7 +176,7 @@ class GD_CORE_API VariableFinderEventWorker
         }
         // Remember the value of the last "object" parameter.
         else if (gd::ParameterMetadata::IsObject(
-                    instrInfos.parameters[pNb].GetType())) {
+                    instrInfos.parameters.GetParameter(pNb).GetType())) {
           lastObjectParameter =
               instruction.GetParameter(pNb).GetPlainString();
         }
@@ -229,7 +231,7 @@ 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 +240,7 @@ std::set<gd::String> EventsVariablesFinder::FindAllObjectVariables(
       project,
       layout,
       "objectvar",
-      object.GetName());
+      objectName);
 
   return results;
 }