Show error box when there's an error logging in with provider (#6284)

Do not show in changelog

.circleci/config.yml

@@ -30,7 +30,7 @@ jobs:
 
       - run:
           name: Install Emscripten (for GDevelop.js)
-          command: git clone https://github.com/juj/emsdk.git && cd emsdk && ./emsdk install 1.39.6 && ./emsdk activate 1.39.6 && cd ..
+          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:
@@ -107,7 +107,7 @@ jobs:
 
       - run:
           name: Install Emscripten (for GDevelop.js)
-          command: git clone https://github.com/juj/emsdk.git && cd emsdk && ./emsdk install 1.39.6 && ./emsdk activate 1.39.6 && cd ..
+          command: git clone https://github.com/juj/emsdk.git && cd emsdk && ./emsdk install 3.1.21 && ./emsdk activate 3.1.21 && cd ..
 
       - run:
           name: Install system dependencies for Electron builder
@@ -127,7 +127,8 @@ jobs:
       # Build GDevelop.js (and run tests to ensure it works)
       - run:
           name: Build GDevelop.js
-          command: cd GDevelop.js && source ../emsdk/emsdk_env.sh && npm run build && npm test && cd ..
+          # Use "--runInBand" as it's faster and avoid deadlocks on CircleCI Linux machines (probably because limited in processes number).
+          command: cd GDevelop.js && source ../emsdk/emsdk_env.sh && npm run build && npm test -- --runInBand && cd ..
 
       # GDevelop IDE dependencies (after building GDevelop.js to avoid downloading a pre-built version)
       - run:
@@ -184,7 +185,7 @@ jobs:
 
       - run:
           name: Install Emscripten (for GDevelop.js)
-          command: git clone https://github.com/juj/emsdk.git && cd emsdk && ./emsdk install 1.39.6 && ./emsdk activate 1.39.6 && cd ..
+          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:
@@ -200,7 +201,8 @@ jobs:
       # Build GDevelop.js (and run tests to ensure it works)
       - run:
           name: Build GDevelop.js
-          command: cd GDevelop.js && source ../emsdk/emsdk_env.sh && npm run build && npm test && cd ..
+          # Use "--runInBand" as it's faster and avoid deadlocks on CircleCI Linux machines (probably because limited in processes number).
+          command: cd GDevelop.js && source ../emsdk/emsdk_env.sh && npm run build && npm test -- --runInBand && cd ..
 
       - save_cache:
           paths:

.github/ISSUE_TEMPLATE/--automatic-crash.yml

@@ -0,0 +1,37 @@
+name: 💥 Automatic crash report
+description: Do not use this template for bug reports. This template is only for automatic crash reports.
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe what you were doing when the crash happened
+      description: If applicable, add screenshots to help explain your problem.
+      placeholder: |
+        1. Went to '...'
+        2. Clicked on '...'
+        3. Scrolled down to '...'
+        4. Saw error
+  - type: input
+    id: gdevelop_version
+    attributes:
+      label: GDevelop version
+      description: |
+        The version of GDevelop used. Leave the prefilled value.
+    validations:
+      required: true
+  - type: textarea
+    id: platform_info
+    attributes:
+      label: Platform info
+      description: |
+        The platform you are using GDevelop on. Leave the prefilled value.
+  - type: textarea
+    id: error_stack
+    attributes:
+      label: Additional error context
+      description: Additonal context about the problem. Leave the prefilled value.
+  - type: textarea
+    id: component_stack
+    attributes:
+      label: Additional component context
+      description: Additonal context about the problem. Leave the prefilled value.

.github/ISSUE_TEMPLATE/--bug-report.yml

@@ -2,18 +2,21 @@ name: 🐛Bug report
 description: Create a bug report about GDevelop or the game engine
 body:
   - type: checkboxes
+    id: searched_issues
     attributes:
       label: Is there an existing issue for this?
       options:
-      - label: I have searched the [existing issues](https://github.com/4ian/GDevelop/issues)
-        required: true
+        - label: I have searched the [existing issues](https://github.com/4ian/GDevelop/issues)
+          required: true
   - type: textarea
+    id: description
     attributes:
       label: Describe the bug
       description: A clear and concise description of what the bug is.
     validations:
       required: true
   - type: textarea
+    id: reproduction_steps
     attributes:
       label: Steps to reproduce
       description: |
@@ -27,6 +30,7 @@ body:
     validations:
       required: true
   - type: dropdown
+    id: platform
     attributes:
       label: GDevelop platform
       description: Which platform of GDevelop are you using?
@@ -38,6 +42,7 @@ body:
     validations:
       required: true
   - type: input
+    id: gdevelop_version
     attributes:
       label: GDevelop version
       description: |
@@ -47,6 +52,7 @@ body:
     validations:
       required: true
   - type: textarea
+    id: platform_info
     attributes:
       label: Platform info
       value: |
@@ -66,6 +72,7 @@ body:
 
         </details>
   - type: textarea
+    id: additional_context
     attributes:
       label: Additional context
       description: Add any other context about the problem here.

.gitpod.yml

@@ -14,7 +14,7 @@ tasks:
     init: |
           sudo apt-get update 
           sudo apt install cmake python-is-python3 python3-distutils -y
-          git clone https://github.com/juj/emsdk.git && cd emsdk && ./emsdk install 1.39.6 && ./emsdk activate 1.39.6 && cd ..
+          git clone https://github.com/juj/emsdk.git && cd emsdk && ./emsdk install 3.1.21 && ./emsdk activate 3.1.21 && cd ..
           cd GDevelop.js
           npm install
           source ../emsdk/emsdk_env.sh && npm run build -- --dev

.travis.yml

@@ -39,7 +39,7 @@ install:
   - cd ..
 # Install Emscripten (for GDevelop.js)
   - git clone https://github.com/juj/emsdk.git
-  - cd emsdk && ./emsdk install 1.39.6 && ./emsdk activate 1.39.6 && cd ..
+  - cd emsdk && ./emsdk install 3.1.21 && ./emsdk activate 3.1.21 && cd ..
 # Install GDevelop.js dependencies
   - cd GDevelop.js && npm install && cd ..
 # Build GDevelop.js

.vscode/settings.json

@@ -113,7 +113,8 @@
     "memory_resource": "cpp",
     "__bits": "cpp",
     "__verbose_abort": "cpp",
-    "variant": "cpp"
+    "variant": "cpp",
+    "charconv": "cpp"
   },
   "files.exclude": {
     "Binaries/*build*": true,

Core/GDCore/Events/Builtin/LinkEvent.cpp

@@ -164,7 +164,7 @@ void LinkEvent::UnserializeFrom(gd::Project& project,
 }
 
 bool LinkEvent::AcceptVisitor(gd::EventVisitor &eventVisitor) {
-  return BaseEvent::AcceptVisitor(eventVisitor) |
+  return BaseEvent::AcceptVisitor(eventVisitor) ||
          eventVisitor.VisitLinkEvent(*this);
 }
 

Core/GDCore/Events/CodeGeneration/EffectsCodeGenerator.cpp

@@ -46,10 +46,6 @@ void EffectsCodeGenerator::GenerateEffectsIncludeFiles(
   // TODO Add unit tests on this function.
   
   // TODO Merge with UsedExtensionsFinder.
-  // Default lights rely on the fact that UsedExtensionsFinder doesn't find
-  // extension usages for effects. This has the happy side effect of not
-  // including Three.js when no 3D object are in the scenes.
-  // We need to make something explicit to avoid future bugs.
 
   // See also gd::Project::ExposeResources for a method that traverse the whole
   // project (this time for resources) and

Core/GDCore/Events/CodeGeneration/EventsCodeGenerator.cpp

@@ -69,8 +69,36 @@ gd::String EventsCodeGenerator::GenerateRelationalOperatorCall(
     }
   }
 
-  return callStartString + "(" + argumentsStr + ") " + relationalOperator +
-         " " + rhs;
+  auto lhs = callStartString + "(" + argumentsStr + ")";
+  return GenerateRelationalOperation(relationalOperator, lhs, rhs);
+}
+
+/**
+ * @brief Generate a relational operation
+ * 
+ * @param relationalOperator the operator
+ * @param lhs the left hand operand
+ * @param rhs the right hand operand
+ * @return gd::String 
+ */
+gd::String EventsCodeGenerator::GenerateRelationalOperation(
+    const gd::String& relationalOperator,
+    const gd::String& lhs,
+    const gd::String& rhs) {
+  return lhs + " " + GenerateRelationalOperatorCodes(relationalOperator) + " " + rhs;
+}
+
+const gd::String EventsCodeGenerator::GenerateRelationalOperatorCodes(const gd::String &operatorString) {
+    if (operatorString == "=") {
+        return "==";
+    }
+    if (operatorString != "<" && operatorString != ">" &&
+        operatorString != "<=" && operatorString != ">=" && operatorString != "!=" &&
+        operatorString != "startsWith" && operatorString != "endsWith" && operatorString != "contains") {
+      cout << "Warning: Bad relational operator: Set to == by default." << endl;
+      return "==";
+    }
+    return operatorString;
 }
 
 /**
@@ -638,18 +666,6 @@ gd::String EventsCodeGenerator::GenerateActionsListCode(
   return outputCode;
 }
 
-const gd::String EventsCodeGenerator::GenerateRelationalOperatorCodes(const gd::String &operatorString) {
-    if (operatorString == "=") {
-        return "==";
-    }
-    if (operatorString != "<" && operatorString != ">" &&
-        operatorString != "<=" && operatorString != ">=" && operatorString != "!=") {
-      cout << "Warning: Bad relational operator: Set to == by default." << endl;
-      return "==";
-    }
-    return operatorString;
-}
-
 gd::String EventsCodeGenerator::GenerateParameterCodes(
     const gd::Expression& parameter,
     const gd::ParameterMetadata& metadata,
@@ -674,7 +690,7 @@ gd::String EventsCodeGenerator::GenerateParameterCodes(
     argOutput =
         GenerateObject(parameter.GetPlainString(), metadata.GetType(), context);
   } else if (metadata.GetType() == "relationalOperator") {
-    argOutput += GenerateRelationalOperatorCodes(parameter.GetPlainString());
+    argOutput += parameter.GetPlainString();
     argOutput = "\"" + argOutput + "\"";
   } else if (metadata.GetType() == "operator") {
     argOutput += parameter.GetPlainString();
@@ -698,6 +714,8 @@ gd::String EventsCodeGenerator::GenerateParameterCodes(
              metadata.GetType() == "tilesetResource" ||
              metadata.GetType() == "videoResource" ||
              metadata.GetType() == "model3DResource" ||
+             metadata.GetType() == "atlasResource" ||
+             metadata.GetType() == "spineResource" ||
              // Deprecated, old parameter names:
              metadata.GetType() == "password" || metadata.GetType() == "musicfile" ||
              metadata.GetType() == "soundfile" || metadata.GetType() == "police") {
@@ -1212,13 +1230,13 @@ gd::String EventsCodeGenerator::GeneratePropertyGetter(const gd::PropertiesConta
                                                        const gd::NamedPropertyDescriptor& property,
                                                        const gd::String& type,
                                                        gd::EventsCodeGenerationContext& context) {
-  return "getProperty" + property.GetName() + "()";
+  return "getProperty" + property.GetName() + "As" + type + "()";
 }
 
 gd::String EventsCodeGenerator::GenerateParameterGetter(const gd::ParameterMetadata& parameter,
                                                         const gd::String& type,
                                                         gd::EventsCodeGenerationContext& context) {
-  return "getParameter" + parameter.GetName() + "()";
+  return "getParameter" + parameter.GetName() + "As" + type + "()";
 }
 
 EventsCodeGenerator::EventsCodeGenerator(const gd::Project& project_,

Core/GDCore/Events/CodeGeneration/EventsCodeGenerator.h

@@ -12,8 +12,8 @@
 
 #include "GDCore/Events/Event.h"
 #include "GDCore/Events/Instruction.h"
-#include "GDCore/String.h"
 #include "GDCore/Project/ProjectScopedContainers.h"
+#include "GDCore/String.h"
 namespace gd {
 class EventsList;
 class Expression;
@@ -58,8 +58,9 @@ class GD_CORE_API EventsCodeGenerator {
    * \brief Construct a code generator for the specified
    * objects/groups and platform
    */
-  EventsCodeGenerator(const gd::Platform& platform,
-                      const gd::ProjectScopedContainers& projectScopedContainers_);
+  EventsCodeGenerator(
+      const gd::Platform& platform,
+      const gd::ProjectScopedContainers& projectScopedContainers_);
   virtual ~EventsCodeGenerator(){};
 
   /**
@@ -472,10 +473,15 @@ class GD_CORE_API EventsCodeGenerator {
    */
   size_t GenerateSingleUsageUniqueIdForEventsList();
 
+  virtual gd::String GenerateRelationalOperation(
+      const gd::String& relationalOperator,
+      const gd::String& lhs,
+      const gd::String& rhs);
+
+ protected:
   virtual const gd::String GenerateRelationalOperatorCodes(
       const gd::String& operatorString);
 
- protected:
   /**
    * \brief Generate the code for a single parameter.
    *
@@ -546,7 +552,9 @@ class GD_CORE_API EventsCodeGenerator {
   };
 
   virtual gd::String GenerateVariableValueAs(const gd::String& type) {
-    return type == "string" ? ".getAsString()" : ".getAsNumber()";
+    return type == "number|string" ? ".getAsNumberOrString()"
+           : type == "string"      ? ".getAsString()"
+                                   : ".getAsNumber()";
   }
 
   /**
@@ -577,14 +585,16 @@ class GD_CORE_API EventsCodeGenerator {
     return "fakeObjectListOf_" + objectName;
   }
 
-  virtual gd::String GeneratePropertyGetter(const gd::PropertiesContainer& propertiesContainer,
-                                            const gd::NamedPropertyDescriptor& property,
-                                            const gd::String& type,
-                                            gd::EventsCodeGenerationContext& context);
+  virtual gd::String GeneratePropertyGetter(
+      const gd::PropertiesContainer& propertiesContainer,
+      const gd::NamedPropertyDescriptor& property,
+      const gd::String& type,
+      gd::EventsCodeGenerationContext& context);
 
-  virtual gd::String GenerateParameterGetter(const gd::ParameterMetadata& parameter,
-                                             const gd::String& type,
-                                             gd::EventsCodeGenerationContext& context);
+  virtual gd::String GenerateParameterGetter(
+      const gd::ParameterMetadata& parameter,
+      const gd::String& type,
+      gd::EventsCodeGenerationContext& context);
 
   /**
    * \brief Generate the code to reference an object which is
@@ -665,7 +675,8 @@ class GD_CORE_API EventsCodeGenerator {
    * The default implementation generates C-style code : It wraps the predicate
    * inside parenthesis and add a !.
    */
-  virtual gd::String GenerateNegatedPredicate(const gd::String& predicate) const {
+  virtual gd::String GenerateNegatedPredicate(
+      const gd::String& predicate) const {
     return "!(" + predicate + ")";
   };
 
@@ -726,6 +737,7 @@ class GD_CORE_API EventsCodeGenerator {
       const std::vector<gd::String>& arguments,
       const gd::String& callStartString,
       std::size_t startFromArgument = 0);
+
   gd::String GenerateOperatorCall(const gd::InstructionMetadata& instrInfos,
                                   const std::vector<gd::String>& arguments,
                                   const gd::String& callStartString,

Core/GDCore/Events/CodeGeneration/ExpressionCodeGenerator.cpp

@@ -103,7 +103,7 @@ void ExpressionCodeGenerator::OnVisitVariableNode(VariableNode& node) {
   // This "translation" from the type to an enum could be avoided
   // if all types were moved to an enum.
   auto type = gd::ExpressionTypeFinder::GetType(codeGenerator.GetPlatform(),
-                                            codeGenerator.GetObjectsContainersList(),
+                                            codeGenerator.GetProjectScopedContainers(),
                                             rootType,
                                             node);
 
@@ -191,7 +191,7 @@ void ExpressionCodeGenerator::OnVisitVariableBracketAccessorNode(
     return;
   }
 
-  ExpressionCodeGenerator generator("string", "", codeGenerator, context);
+  ExpressionCodeGenerator generator("number|string", "", codeGenerator, context);
   node.expression->Visit(generator);
   output +=
       codeGenerator.GenerateVariableBracketAccessor(generator.GetOutput());
@@ -200,7 +200,7 @@ void ExpressionCodeGenerator::OnVisitVariableBracketAccessorNode(
 
 void ExpressionCodeGenerator::OnVisitIdentifierNode(IdentifierNode& node) {
   auto type = gd::ExpressionTypeFinder::GetType(codeGenerator.GetPlatform(),
-                                            codeGenerator.GetObjectsContainersList(),
+                                            codeGenerator.GetProjectScopedContainers(),
                                             rootType,
                                             node);
 
@@ -271,7 +271,7 @@ void ExpressionCodeGenerator::OnVisitIdentifierNode(IdentifierNode& node) {
 
 void ExpressionCodeGenerator::OnVisitFunctionCallNode(FunctionCallNode& node) {
   auto type = gd::ExpressionTypeFinder::GetType(codeGenerator.GetPlatform(),
-                                            codeGenerator.GetObjectsContainersList(),
+                                            codeGenerator.GetProjectScopedContainers(),
                                             rootType,
                                             node);
 
@@ -502,7 +502,7 @@ gd::String ExpressionCodeGenerator::GenerateDefaultValue(
 
 void ExpressionCodeGenerator::OnVisitEmptyNode(EmptyNode& node) {
   auto type = gd::ExpressionTypeFinder::GetType(codeGenerator.GetPlatform(),
-                                            codeGenerator.GetObjectsContainersList(),
+                                            codeGenerator.GetProjectScopedContainers(),
                                             rootType,
                                             node);
   output += GenerateDefaultValue(type);
@@ -511,7 +511,7 @@ void ExpressionCodeGenerator::OnVisitEmptyNode(EmptyNode& node) {
 void ExpressionCodeGenerator::OnVisitObjectFunctionNameNode(
     ObjectFunctionNameNode& node) {
   auto type = gd::ExpressionTypeFinder::GetType(codeGenerator.GetPlatform(),
-                                            codeGenerator.GetObjectsContainersList(),
+                                            codeGenerator.GetProjectScopedContainers(),
                                             rootType,
                                             node);
   output += GenerateDefaultValue(type);

Core/GDCore/Events/Parsers/ExpressionParser2.h

@@ -277,8 +277,11 @@ class GD_CORE_API ExpressionParser2 {
 
   std::unique_ptr<VariableNode> Variable(const gd::String &name, gd::ExpressionParserLocation nameLocation) {
     auto variable = gd::make_unique<VariableNode>(name);
-    variable->child = VariableAccessorOrVariableBracketAccessor();
-    variable->child->parent = variable.get();
+
+    if (CheckIfChar(IsOpeningSquareBracket) || CheckIfChar(IsDot)) {
+      variable->child = VariableAccessorOrVariableBracketAccessor();
+      variable->child->parent = variable.get();
+    }
 
     variable->location = ExpressionParserLocation(
         nameLocation.GetStartPosition(), GetCurrentPosition());
@@ -302,8 +305,12 @@ class GD_CORE_API ExpressionParser2 {
                                "bracket for each opening bracket."));
       }
       SkipIfChar(IsClosingSquareBracket);
-      child->child = VariableAccessorOrVariableBracketAccessor();
-      child->child->parent = child.get();
+
+      SkipAllWhitespaces();
+      if (CheckIfChar(IsOpeningSquareBracket) || CheckIfChar(IsDot)) {
+        child->child = VariableAccessorOrVariableBracketAccessor();
+        child->child->parent = child.get();
+      }
       child->location =
           ExpressionParserLocation(childStartPosition, GetCurrentPosition());
 
@@ -315,8 +322,15 @@ class GD_CORE_API ExpressionParser2 {
       auto identifierAndLocation = ReadIdentifierName(/*allowDeprecatedSpacesInName=*/ false);
       auto child =
           gd::make_unique<VariableAccessorNode>(identifierAndLocation.name);
-      child->child = VariableAccessorOrVariableBracketAccessor();
-      child->child->parent = child.get();
+      if (identifierAndLocation.name.empty()) {
+        child->diagnostic = RaiseSyntaxError(_("A name should be entered after the dot."));
+      }
+
+      SkipAllWhitespaces();
+      if (CheckIfChar(IsOpeningSquareBracket) || CheckIfChar(IsDot)) {
+        child->child = VariableAccessorOrVariableBracketAccessor();
+        child->child->parent = child.get();
+      }
       child->nameLocation = identifierAndLocation.location;
       child->dotLocation = dotLocation;
       child->location =
@@ -325,7 +339,11 @@ class GD_CORE_API ExpressionParser2 {
       return std::move(child);
     }
 
-    return std::move(gd::make_unique<VariableAccessorOrVariableBracketAccessorNode>());
+    // Should never happen, unless a node called this function without checking if the current character
+    // was a dot or an opening bracket - this means there is an error in the grammar.
+    auto unrecognisedNode = gd::make_unique<VariableAccessorOrVariableBracketAccessorNode>();
+    unrecognisedNode->diagnostic = RaiseSyntaxError(_("A dot or bracket was expected here."));
+    return std::move(unrecognisedNode);
   }
 
   std::unique_ptr<FunctionCallNode> FreeFunction(
@@ -361,18 +379,24 @@ class GD_CORE_API ExpressionParser2 {
     const auto &childIdentifierNameLocation =
         childIdentifierAndLocation.location;
 
+    std::unique_ptr<gd::ExpressionParserError> emptyNameError = childIdentifierName.empty() ?
+      RaiseSyntaxError(_("A name should be entered after the dot.")) : nullptr;
+
     SkipAllWhitespaces();
 
     if (IsNamespaceSeparator()) {
       ExpressionParserLocation namespaceSeparatorLocation =
           SkipNamespaceSeparator();
       SkipAllWhitespaces();
-      return BehaviorFunction(parentIdentifier,
+      auto behaviorFunction = BehaviorFunction(parentIdentifier,
                               childIdentifierName,
                               parentIdentifierLocation,
                               parentIdentifierDotLocation,
                               childIdentifierNameLocation,
                               namespaceSeparatorLocation);
+
+      if (emptyNameError) behaviorFunction->diagnostic = std::move(emptyNameError);
+      return std::move(behaviorFunction);
     } else if (CheckIfChar(IsOpeningParenthesis)) {
       ExpressionParserLocation openingParenthesisLocation = SkipChar();
 
@@ -381,7 +405,7 @@ class GD_CORE_API ExpressionParser2 {
           childIdentifierName);
       auto parametersNode = Parameters(function.get(), parentIdentifier);
       function->parameters = std::move(parametersNode.parameters),
-      function->diagnostic = std::move(parametersNode.diagnostic);
+      function->diagnostic = emptyNameError ? std::move(emptyNameError) : std::move(parametersNode.diagnostic);
 
       function->location = ExpressionParserLocation(
           parentIdentifierLocation.GetStartPosition(), GetCurrentPosition());
@@ -394,6 +418,8 @@ class GD_CORE_API ExpressionParser2 {
       return std::move(function);
     } else if (CheckIfChar(IsDot) || CheckIfChar(IsOpeningSquareBracket)) {
       auto variable = gd::make_unique<VariableNode>(parentIdentifier);
+      variable->diagnostic = std::move(emptyNameError);
+
       auto child =
           gd::make_unique<VariableAccessorNode>(childIdentifierName);
       child->child = VariableAccessorOrVariableBracketAccessor();
@@ -419,6 +445,7 @@ class GD_CORE_API ExpressionParser2 {
     node->identifierNameLocation = parentIdentifierLocation;
     node->identifierNameDotLocation = parentIdentifierDotLocation;
     node->childIdentifierNameLocation = childIdentifierNameLocation;
+    node->diagnostic = std::move(emptyNameError);
     return std::move(node);
   }
 
@@ -491,11 +518,6 @@ class GD_CORE_API ExpressionParser2 {
     std::vector<std::unique_ptr<ExpressionNode>> parameters;
     gd::String lastObjectName = "";
 
-    // By convention, object is always the first parameter, and behavior the
-    // second one.
-    size_t parameterIndex =
-        WrittenParametersFirstIndex(objectName, behaviorName);
-
     bool previousCharacterIsParameterSeparator = false;
     while (!IsEndReached()) {
       SkipAllWhitespaces();
@@ -514,7 +536,6 @@ class GD_CORE_API ExpressionParser2 {
       SkipAllWhitespaces();
       previousCharacterIsParameterSeparator = CheckIfChar(IsParameterSeparator);
       SkipIfChar(IsParameterSeparator);
-      parameterIndex++;
     }
 
     ExpressionParserLocation invalidClosingParenthesisLocation;

Core/GDCore/Events/Parsers/ExpressionParser2NodePrinter.h

@@ -8,6 +8,7 @@
 
 #include <memory>
 #include <vector>
+
 #include "GDCore/Events/Parsers/ExpressionParser2Node.h"
 #include "GDCore/Events/Parsers/ExpressionParser2NodeWorker.h"
 namespace gd {
@@ -43,6 +44,11 @@ class GD_CORE_API ExpressionParser2NodePrinter
    */
   const gd::String& GetOutput() { return output; };
 
+  static gd::String PrintStringLiteral(const gd::String& str) {
+    return "\"" +
+           str.FindAndReplace("\\", "\\\\").FindAndReplace("\"", "\\\"") + "\"";
+  }
+
  protected:
   void OnVisitSubExpressionNode(SubExpressionNode& node) override {
     output += "(";
@@ -69,10 +75,7 @@ class GD_CORE_API ExpressionParser2NodePrinter
   }
   void OnVisitNumberNode(NumberNode& node) override { output += node.number; }
   void OnVisitTextNode(TextNode& node) override {
-    output +=
-        "\"" +
-        node.text.FindAndReplace("\\", "\\\\").FindAndReplace("\"", "\\\"") +
-        "\"";
+    output += PrintStringLiteral(node.text);
   }
   void OnVisitVariableNode(VariableNode& node) override {
     output += node.name;
@@ -97,8 +100,8 @@ class GD_CORE_API ExpressionParser2NodePrinter
   }
   void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode& node) override {
     if (!node.behaviorFunctionName.empty()) {
-      output +=
-          node.objectName + "." + node.objectFunctionOrBehaviorName + "::" + node.behaviorFunctionName;
+      output += node.objectName + "." + node.objectFunctionOrBehaviorName +
+                "::" + node.behaviorFunctionName;
     } else {
       output += node.objectName + "." + node.objectFunctionOrBehaviorName;
     }

Core/GDCore/Extensions/Builtin/AdvancedExtension.cpp

@@ -115,21 +115,23 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAdvancedExtension(
       .AddExpression(
           "GetArgumentAsNumber",
           _("Get function parameter value"),
-          _("Get function parameter (also called \"argument\") value."),
+          _("Get function parameter (also called \"argument\") value. You don't need this most of the time as you can simply write the parameter name in an expression."),
           "",
           "res/function16.png")
       .AddParameter("functionParameterName", _("Parameter name"), "number,string,boolean")
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddStrExpression(
           "GetArgumentAsString",
           _("Get function parameter text"),
-          _("Get function parameter (also called \"argument\") text."),
+          _("Get function parameter (also called \"argument\") text. You don't need this most of the time as you can simply write the parameter name in an expression."),
           "",
           "res/function16.png")
       .AddParameter("functionParameterName", _("Parameter name"), "number,string,boolean")
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddCondition(

Core/GDCore/Extensions/Builtin/AllBuiltinExtensions.h

@@ -49,6 +49,7 @@ class GD_CORE_API BuiltinExtensionsImplementer {
   static void ImplementsAnimatableExtension(gd::PlatformExtension& extension);
   static void ImplementsEffectExtension(gd::PlatformExtension& extension);
   static void ImplementsOpacityExtension(gd::PlatformExtension& extension);
+  static void ImplementsTextContainerExtension(gd::PlatformExtension& extension);
 };
 
 }  // namespace gd

Core/GDCore/Extensions/Builtin/BaseObjectExtension.cpp

@@ -396,7 +396,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Z order"),
                 _("Modify the Z-order of an object"),
                 _("the z-order"),
-                _("Z order"),
+                _("Layers and cameras"),
                 "res/actions/planicon24.png",
                 "res/actions/planicon.png")
 
@@ -550,7 +550,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                    _("Z-order"),
                    _("Compare the Z-order of the specified object."),
                    _("the Z-order"),
-                   _("Z-order"),
+                   _("Layer"),
                    "res/conditions/planicon24.png",
                    "res/conditions/planicon.png")
 
@@ -617,6 +617,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
           "number", ParameterOptions::MakeNewOptions())
       .MarkAsAdvanced();
 
+  // Deprecated
   obj.AddCondition("AngleOfDisplacement",
                    _("Angle of movement (using forces)"),
                    _("Compare the angle of movement of an object according to "
@@ -626,7 +627,20 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                    _("Movement using forces"),
                    "res/conditions/vitesse24.png",
                    "res/conditions/vitesse.png")
+      .SetHidden()
+      .AddParameter("object", _("Object"))
+      .AddParameter("expression", _("Angle, in degrees"))
+      .AddParameter("expression", _("Tolerance, in degrees"))
+      .MarkAsAdvanced();
 
+  obj.AddCondition("IsTotalForceAngleAround",
+                   _("Angle of movement (using forces)"),
+                   _("Compare the angle of movement of an object according to "
+                     "the forces applied on it."),
+                   _("Angle of movement of _PARAM0_ is _PARAM1_ ± _PARAM2_°"),
+                   _("Movement using forces"),
+                   "res/conditions/vitesse24.png",
+                   "res/conditions/vitesse.png")
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angle, in degrees"))
       .AddParameter("expression", _("Tolerance, in degrees"))
@@ -1137,7 +1151,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
   obj.AddExpression("ZOrder",
                     _("Z-order"),
                     _("Z-order of an object"),
-                    _("Visibility"),
+                    "",
                     "res/actions/planicon.png")
       .AddParameter("object", _("Object"));
 
@@ -1267,8 +1281,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Enable an effect on the object"),
                 _("Enable effect _PARAM1_ on _PARAM0_: _PARAM2_"),
                 _("Effects"),
-                "res/actions/effect24.png",
-                "res/actions/effect.png")
+                "res/actions/effect_black.svg",
+                "res/actions/effect_black.svg")
       .AddParameter("object", _("Object"))
       .AddParameter("objectEffectName", _("Effect name"))
       .AddParameter("yesorno", _("Enable?"))
@@ -1283,8 +1297,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                       "names) in the effects window."),
                 _("Set _PARAM2_ to _PARAM3_ for effect _PARAM1_ of _PARAM0_"),
                 _("Effects"),
-                "res/actions/effect24.png",
-                "res/actions/effect.png")
+                "res/actions/effect_black.svg",
+                "res/actions/effect_black.svg")
       .AddParameter("object", _("Object"))
       .AddParameter("objectEffectName", _("Effect name"))
       .AddParameter("objectEffectParameterName", _("Property name"))
@@ -1301,8 +1315,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                       "names) in the effects window."),
                 _("Set _PARAM2_ to _PARAM3_ for effect _PARAM1_ of _PARAM0_"),
                 _("Effects"),
-                "res/actions/effect24.png",
-                "res/actions/effect.png")
+                "res/actions/effect_black.svg",
+                "res/actions/effect_black.svg")
       .AddParameter("object", _("Object"))
       .AddParameter("objectEffectName", _("Effect name"))
       .AddParameter("objectEffectParameterName", _("Property name"))
@@ -1318,8 +1332,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                       "names) in the effects window."),
                 _("Enable _PARAM2_ for effect _PARAM1_ of _PARAM0_: _PARAM3_"),
                 _("Effects"),
-                "res/actions/effect24.png",
-                "res/actions/effect.png")
+                "res/actions/effect_black.svg",
+                "res/actions/effect_black.svg")
       .AddParameter("object", _("Object"))
       .AddParameter("objectEffectName", _("Effect name"))
       .AddParameter("objectEffectParameterName", _("Property name"))
@@ -1333,8 +1347,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                    _("Check if the effect on an object is enabled."),
                    _("Effect _PARAM1_ of _PARAM0_ is enabled"),
                    _("Effects"),
-                   "res/actions/effect24.png",
-                   "res/actions/effect.png")
+                   "res/actions/effect_black.svg",
+                   "res/actions/effect_black.svg")
       .AddParameter("object", _("Object"))
       .AddParameter("objectEffectName", _("Effect name"))
       .MarkAsSimple()
@@ -1610,7 +1624,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
           _("Cast a ray from _PARAM1_;_PARAM2_, angle: _PARAM3_ and max "
             "distance: _PARAM4_px, against _PARAM0_, and save the "
             "result in _PARAM5_, _PARAM6_"),
-          "",
+          _("Collision"),
           "res/conditions/raycast24.png",
           "res/conditions/raycast.png")
       .AddParameter("objectList", _("Objects to test against the ray"))
@@ -1641,7 +1655,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
           _("Cast a ray from _PARAM1_;_PARAM2_ to _PARAM3_;_PARAM4_ "
             "against _PARAM0_, and save the "
             "result in _PARAM5_, _PARAM6_"),
-          "",
+          _("Collision"),
           "res/conditions/raycast24.png",
           "res/conditions/raycast.png")
       .AddParameter("objectList", _("Objects to test against the ray"))

Core/GDCore/Extensions/Builtin/CameraExtension.cpp

@@ -27,7 +27,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
   extension.AddInstructionOrExpressionGroupMetadata(_("Layers and cameras"))
       .SetIcon("res/conditions/camera24.png");
   extension.AddInstructionOrExpressionGroupMetadata(_("Effects"))
-      .SetIcon("res/actions/effect24.png");
+      .SetIcon("res/actions/effect_black.svg");
 
   extension
       .AddExpressionAndConditionAndAction(
@@ -327,7 +327,6 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
       .AddParameter("expression", _("Camera number (default : 0)"), "", true)
       .SetDefaultValue("0");
 
-  // TODO Deprecated: hide this action in a future release.
   extension
       .AddAction(
           "FixCamera",
@@ -339,6 +338,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
           "",
           "res/actions/camera24.png",
           "res/actions/camera.png")
+      .SetHidden()
       .AddCodeOnlyParameter("currentScene", "")
       .AddParameter("objectPtr", _("Object"))
       .AddParameter("expression",
@@ -386,7 +386,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
                  _("Center the camera on an object"),
                  _("Center the camera on the specified object."),
                  _("Center camera on _PARAM1_ (layer: _PARAM3_)"),
-                 "",
+                 _("Layers and cameras"),
                  "res/actions/camera24.png",
                  "res/actions/camera.png")
       .AddCodeOnlyParameter("currentScene", "")
@@ -450,8 +450,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
                 "names) in the effects window."),
           _("Set _PARAM3_ to _PARAM4_ for effect _PARAM2_ of layer _PARAM1_"),
           _("Effects"),
-          "res/actions/effect24.png",
-          "res/actions/effect.png")
+          "res/actions/effect_black.svg",
+          "res/actions/effect_black.svg")
       .AddCodeOnlyParameter("currentScene", "")
       .AddParameter("layer", _("Layer"), "", true)
       .SetDefaultValue("\"\"")
@@ -469,8 +469,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
                 "names) in the effects window."),
           _("Set _PARAM3_ to _PARAM4_ for effect _PARAM2_ of layer _PARAM1_"),
           _("Effects"),
-          "res/actions/effect24.png",
-          "res/actions/effect.png")
+          "res/actions/effect_black.svg",
+          "res/actions/effect_black.svg")
       .AddCodeOnlyParameter("currentScene", "")
       .AddParameter("layer", _("Layer"), "", true)
       .SetDefaultValue("\"\"")
@@ -488,8 +488,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
                 "names) in the effects window."),
           _("Enable _PARAM3_ for effect _PARAM2_ of layer _PARAM1_: _PARAM4_"),
           _("Effects"),
-          "res/actions/effect24.png",
-          "res/actions/effect.png")
+          "res/actions/effect_black.svg",
+          "res/actions/effect_black.svg")
       .AddCodeOnlyParameter("currentScene", "")
       .AddParameter("layer", _("Layer"), "", true)
       .SetDefaultValue("\"\"")
@@ -504,8 +504,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
                     _("The effect on a layer is enabled"),
                     _("Effect _PARAM2_ on layer _PARAM1_ is enabled"),
                     _(""),
-                    "res/actions/effect24.png",
-                    "res/actions/effect.png")
+                    "res/actions/effect_black.svg",
+                    "res/actions/effect_black.svg")
       .AddCodeOnlyParameter("currentScene", "")
       .AddParameter("layer", _("Layer"), "", true)
       .SetDefaultValue("\"\"")
@@ -518,8 +518,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
                  _("Enable an effect on a layer"),
                  _("Enable effect _PARAM2_ on layer _PARAM1_: _PARAM3_"),
                  _("Effects"),
-                 "res/actions/effect24.png",
-                 "res/actions/effect.png")
+                 "res/actions/effect_black.svg",
+                 "res/actions/effect_black.svg")
       .AddCodeOnlyParameter("currentScene", "")
       .AddParameter("layer", _("Layer"), "", true)
       .SetDefaultValue("\"\"")
@@ -548,7 +548,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
   extension
       .AddAction(
           "ChangeLayerTimeScale",
-          _("Change layer time scale"),
+          _("Layer time scale"),
           _("Change the time scale applied to the objects of the layer."),
           _("Set the time scale of layer _PARAM1_ to _PARAM2_"),
           "",
@@ -594,7 +594,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsCameraExtension(
   extension
       .AddAction(
           "SetLayerAmbientLightColor",
-          _("Set the ambient light color"),
+          _("Ambient light color"),
           _("Set the ambient light color of the lighting layer in format "
             "\"R;G;B\" string."),
           _("Set the ambient color of the lighting layer _PARAM1_ to _PARAM2_"),

Core/GDCore/Extensions/Builtin/Capabilities/AnimatableExtension.cpp

@@ -23,6 +23,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAnimatableExtension(
                                "Florian Rival",
                                "Open source (MIT License)")
       .SetExtensionHelpPath("/objects");
+  extension.AddInstructionOrExpressionGroupMetadata(_("Animatable capability"))
+      .SetIcon("res/actions/animation24.png");
   extension.AddInstructionOrExpressionGroupMetadata(_("Animations and images"))
       .SetIcon("res/actions/animation24.png");
 
@@ -42,7 +44,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAnimatableExtension(
          "number",
          "Index",
          _("Animation (by number)"),
-         _("the number of the animation played by the object (the number from "
+         _("the animation played by the object using the animation number (from "
            "the animations list)"),
          _("the number of the animation"),
          _("Animations and images"),
@@ -53,6 +55,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAnimatableExtension(
           "number", gd::ParameterOptions::MakeNewOptions().SetDescription(
                         _("Animation index")))
       .MarkAsSimple();
+  aut.GetAllExpressions()["Index"].SetGroup("");
 
   aut.AddExpressionAndConditionAndAction(
          "string",
@@ -69,6 +72,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAnimatableExtension(
           "objectAnimationName", gd::ParameterOptions::MakeNewOptions().SetDescription(
                         _("Animation name")))
       .MarkAsSimple();
+  aut.GetAllStrExpressions()["Name"].SetGroup("");
 
   aut.AddScopedAction("PauseAnimation",
                 _("Pause the animation"),
@@ -107,6 +111,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAnimatableExtension(
           "number", gd::ParameterOptions::MakeNewOptions().SetDescription(
                         _("Speed scale")))
       .MarkAsSimple();
+  aut.GetAllExpressions()["SpeedScale"].SetGroup("");
 
   aut.AddScopedCondition("IsAnimationPaused",
                    _("Animation paused"),
@@ -130,6 +135,31 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAnimatableExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("behavior", _("Behavior"), "AnimatableBehavior")
       .MarkAsSimple();
+
+  aut.AddExpressionAndConditionAndAction(
+         "number",
+         "ElapsedTime",
+         _("Animation elapsed time"),
+         _("the elapsed time from the beginning of the animation (in seconds)"),
+         _("the animation elapsed time"),
+         _("Animations and images"),
+         "res/actions/animation24.png")
+      .AddParameter("object", _("Object"))
+      .AddParameter("behavior", _("Behavior"), "AnimatableBehavior")
+      .UseStandardParameters(
+          "number", gd::ParameterOptions::MakeNewOptions().SetDescription(
+                        _("Elapsed time (in seconds)")))
+      .MarkAsAdvanced();
+  aut.GetAllExpressions()["ElapsedTime"].SetGroup("");
+
+  aut.AddExpression(
+         "Duration",
+         _("Animation duration"),
+         _("Return the current animation duration (in seconds)."),
+         _("Animations and images"),
+         "res/actions/animation24.png")
+      .AddParameter("object", _("Object"))
+      .AddParameter("behavior", _("Behavior"), "AnimatableBehavior");
 }
 
 }  // namespace gd

Core/GDCore/Extensions/Builtin/Capabilities/EffectExtension.cpp

@@ -24,7 +24,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsEffectExtension(
                                "Open source (MIT License)")
       .SetExtensionHelpPath("/objects");
   extension.AddInstructionOrExpressionGroupMetadata(_("Effects"))
-      .SetIcon("res/actions/effect24.png");
+      .SetIcon("res/actions/effect_black.svg");
 
   gd::BehaviorMetadata& aut = extension.AddBehavior(
       "EffectBehavior",
@@ -32,7 +32,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsEffectExtension(
       "Effect",
       _("Apply visual effects to objects."),
       "",
-      "res/actions/effect24.png",
+      "res/actions/effect_black.svg",
       "EffectBehavior",
       std::make_shared<gd::Behavior>(),
       std::make_shared<gd::BehaviorsSharedData>())
@@ -43,8 +43,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsEffectExtension(
                 _("Enable an effect on the object"),
                 _("Enable effect _PARAM2_ on _PARAM0_: _PARAM3_"),
                 _("Effects"),
-                "res/actions/effect24.png",
-                "res/actions/effect.png")
+                "res/actions/effect_black.svg",
+                "res/actions/effect_black.svg")
       .AddParameter("object", _("Object"))
       .AddParameter("behavior", _("Behavior"), "EffectBehavior")
       .AddParameter("objectEffectName", _("Effect name"))
@@ -58,8 +58,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsEffectExtension(
                       "names) in the effects window."),
                 _("Set _PARAM3_ to _PARAM4_ for effect _PARAM2_ of _PARAM0_"),
                 _("Effects"),
-                "res/actions/effect24.png",
-                "res/actions/effect.png")
+                "res/actions/effect_black.svg",
+                "res/actions/effect_black.svg")
       .AddParameter("object", _("Object"))
       .AddParameter("behavior", _("Behavior"), "EffectBehavior")
       .AddParameter("objectEffectName", _("Effect name"))
@@ -75,8 +75,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsEffectExtension(
                       "names) in the effects window."),
                 _("Set _PARAM3_ to _PARAM4_ for effect _PARAM2_ of _PARAM0_"),
                 _("Effects"),
-                "res/actions/effect24.png",
-                "res/actions/effect.png")
+                "res/actions/effect_black.svg",
+                "res/actions/effect_black.svg")
       .AddParameter("object", _("Object"))
       .AddParameter("behavior", _("Behavior"), "EffectBehavior")
       .AddParameter("objectEffectName", _("Effect name"))
@@ -91,8 +91,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsEffectExtension(
                       "names) in the effects window."),
                 _("Enable _PARAM3_ for effect _PARAM2_ of _PARAM0_: _PARAM4_"),
                 _("Effects"),
-                "res/actions/effect24.png",
-                "res/actions/effect.png")
+                "res/actions/effect_black.svg",
+                "res/actions/effect_black.svg")
       .AddParameter("object", _("Object"))
       .AddParameter("behavior", _("Behavior"), "EffectBehavior")
       .AddParameter("objectEffectName", _("Effect name"))
@@ -105,8 +105,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsEffectExtension(
                    _("Check if the effect on an object is enabled."),
                    _("Effect _PARAM2_ of _PARAM0_ is enabled"),
                    _("Effects"),
-                   "res/actions/effect24.png",
-                   "res/actions/effect.png")
+                   "res/actions/effect_black.svg",
+                   "res/actions/effect_black.svg")
       .AddParameter("object", _("Object"))
       .AddParameter("behavior", _("Behavior"), "EffectBehavior")
       .AddParameter("objectEffectName", _("Effect name"))

Core/GDCore/Extensions/Builtin/Capabilities/FlippableExtension.cpp

@@ -24,7 +24,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsFlippableExtension(
                                "Open source (MIT License)")
       .SetExtensionHelpPath("/objects");
   extension.AddInstructionOrExpressionGroupMetadata(_("Effects"))
-      .SetIcon("res/actions/effect24.png");
+      .SetIcon("res/actions/effect_black.svg");
 
   gd::BehaviorMetadata& aut = extension.AddBehavior(
       "FlippableBehavior",

Core/GDCore/Extensions/Builtin/Capabilities/OpacityExtension.cpp

@@ -23,6 +23,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsOpacityExtension(
                                "Florian Rival",
                                "Open source (MIT License)")
       .SetExtensionHelpPath("/objects");
+  extension.AddInstructionOrExpressionGroupMetadata(_("Opacity capability"))
+      .SetIcon("res/actions/opacity24.png");
   extension.AddInstructionOrExpressionGroupMetadata(_("Visibility"))
       .SetIcon("res/actions/opacity24.png");
 
@@ -54,6 +56,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsOpacityExtension(
                         _("Opacity (0-255)")))
       .SetFunctionName("setOpacity")
       .SetGetter("getOpacity");
+  aut.GetAllExpressions()["Value"].SetGroup("");
 }
 
 }  // namespace gd

Core/GDCore/Extensions/Builtin/Capabilities/ScalableExtension.cpp

@@ -23,6 +23,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsScalableExtension(
                                "Florian Rival",
                                "Open source (MIT License)")
       .SetExtensionHelpPath("/objects");
+  extension.AddInstructionOrExpressionGroupMetadata(_("Scalable capability"))
+      .SetIcon("res/actions/scale24_black.png");
   extension.AddInstructionOrExpressionGroupMetadata(_("Size"))
       .SetIcon("res/actions/scale24_black.png");
 
@@ -44,7 +46,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsScalableExtension(
          _("Scale"),
          _("the scale of the object (default scale is 1)"),
          _("the scale"),
-         _("Scale"),
+         _("Size"),
          "res/actions/scale24_black.png")
       .AddParameter("object", _("Object"))
       .AddParameter("behavior", _("Behavior"), "ScalableBehavior")
@@ -53,6 +55,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsScalableExtension(
           gd::ParameterOptions::MakeNewOptions().SetDescription(
               _("Scale (1 by default)")))
       .MarkAsAdvanced();
+  aut.GetAllExpressions()["Value"].SetGroup("");
 
   aut.AddExpressionAndConditionAndAction(
          "number",
@@ -60,7 +63,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsScalableExtension(
          _("Scale on X axis"),
          _("the scale on X axis of the object (default scale is 1)"),
          _("the scale on X axis"),
-         _("Scale"),
+         _("Size"),
          "res/actions/scaleWidth24_black.png")
       .AddParameter("object", _("Object"))
       .AddParameter("behavior", _("Behavior"), "ScalableBehavior")
@@ -69,6 +72,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsScalableExtension(
           gd::ParameterOptions::MakeNewOptions().SetDescription(
               _("Scale (1 by default)")))
       .MarkAsAdvanced();
+  aut.GetAllExpressions()["X"].SetGroup("");
 
   aut.AddExpressionAndConditionAndAction(
          "number",
@@ -76,7 +80,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsScalableExtension(
          _("Scale on Y axis"),
          _("the scale on Y axis of the object (default scale is 1)"),
          _("the scale on Y axis"),
-         _("Scale"),
+         _("Size"),
          "res/actions/scaleHeight24_black.png")
       .AddParameter("object", _("Object"))
       .AddParameter("behavior", _("Behavior"), "ScalableBehavior")
@@ -85,6 +89,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsScalableExtension(
           gd::ParameterOptions::MakeNewOptions().SetDescription(
               _("Scale (1 by default)")))
       .MarkAsAdvanced();
+  aut.GetAllExpressions()["Y"].SetGroup("");
 }
 
 }  // namespace gd

Core/GDCore/Extensions/Builtin/Capabilities/TextContainerExtension.cpp

@@ -0,0 +1,58 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the GNU Lesser General Public
+ * License.
+ */
+#include "GDCore/Extensions/Builtin/AllBuiltinExtensions.h"
+#include "GDCore/Extensions/Metadata/MultipleInstructionMetadata.h"
+#include "GDCore/Project/Behavior.h"
+#include "GDCore/Project/BehaviorsSharedData.h"
+#include "GDCore/Project/Object.h"
+#include "GDCore/Tools/Localization.h"
+
+using namespace std;
+namespace gd {
+
+void GD_CORE_API BuiltinExtensionsImplementer::ImplementsTextContainerExtension(
+    gd::PlatformExtension& extension) {
+  extension
+      .SetExtensionInformation("TextContainerCapability",
+                               _("Text capability"),
+                               _("Animate objects."),
+                               "Florian Rival",
+                               "Open source (MIT License)")
+      .SetExtensionHelpPath("/objects");
+  extension.AddInstructionOrExpressionGroupMetadata(_("Text capability"))
+      .SetIcon("res/conditions/text24_black.png");
+
+  gd::BehaviorMetadata& aut = extension.AddBehavior(
+      "TextContainerBehavior",
+      _("Text capability"),
+      "Text",
+      _("Access objects text."),
+      "",
+      "res/conditions/text24_black.png",
+      "TextContainerBehavior",
+      std::make_shared<gd::Behavior>(),
+      std::make_shared<gd::BehaviorsSharedData>())
+    .SetHidden();
+
+  aut.AddExpressionAndConditionAndAction(
+         "string",
+         "Value",
+         _("Text"),
+         _("the text"),
+         _("the text"),
+         "",
+         "res/conditions/text24_black.png")
+      .AddParameter("object", _("Object"))
+      .AddParameter("behavior", _("Behavior"), "TextContainerBehavior")
+      .UseStandardParameters(
+          "string", gd::ParameterOptions::MakeNewOptions().SetDescription(
+                        _("Text")))
+      .MarkAsSimple();
+  aut.GetAllStrExpressions()["Value"].SetGroup("");
+}
+
+}  // namespace gd

Core/GDCore/Extensions/Builtin/ExternalLayoutsExtension.cpp

@@ -38,6 +38,8 @@ BuiltinExtensionsImplementer::ImplementsExternalLayoutsExtension(
       .SetDefaultValue("0")
       .AddParameter("expression", _("Y position of the origin"), "", true)
       .SetDefaultValue("0")
+      .AddParameter("expression", _("Z position of the origin"), "", true)
+      .SetDefaultValue("0")
       .MarkAsAdvanced();
 }
 

Core/GDCore/Extensions/Builtin/SceneExtension.cpp

@@ -5,6 +5,7 @@
  */
 #include "AllBuiltinExtensions.h"
 #include "GDCore/Tools/Localization.h"
+#include "GDCore/Extensions/Metadata/MultipleInstructionMetadata.h"
 
 using namespace std;
 namespace gd {
@@ -57,7 +58,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsSceneExtension(
   extension
       .AddCondition("DoesSceneExist",
                     _("Does scene exist"),
-                    _("Check if scene exists."),
+                    _("Check if a scene exists."),
                     _("Scene _PARAM1_ exists"),
                     "",
                     "res/actions/texte.png",
@@ -163,6 +164,45 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsSceneExtension(
           "res/actions/window.png")
       .SetHelpPath("/interface/scene-editor/events")
       .AddCodeOnlyParameter("currentScene", "");
+
+  extension
+      .AddAction("PrioritizeLoadingOfScene",
+                 _("Preload scene"),
+                 _("Preload a scene resources as soon as possible in background."),
+                 _("Preload scene _PARAM1_ in background"),
+                 "",
+                 "res/actions/hourglass_black.svg",
+                 "res/actions/hourglass_black.svg")
+      .SetHelpPath("/all-features/resources-loading")
+      .AddCodeOnlyParameter("currentScene", "")
+      .AddParameter("sceneName", _("Name of the new scene"))
+      .MarkAsAdvanced();
+
+  extension.AddExpressionAndCondition("number",
+                                "SceneLoadingProgress",
+                                _("Scene loading progress"),
+                                _("The progress of resources loading in background for a scene (between 0 and 1)."),
+                                _("_PARAM0_ loading progress"),
+                                _(""),
+                                "res/actions/hourglass_black.svg")
+      .SetHelpPath("/all-features/resources-loading")
+      .AddCodeOnlyParameter("currentScene", "")
+      .AddParameter("sceneName", _("Scene name"))
+      .UseStandardParameters("number", ParameterOptions::MakeNewOptions())
+      .MarkAsAdvanced();
+
+  extension
+      .AddCondition("AreSceneAssetsLoaded",
+                    _("Scene preloaded"),
+                    _("Check if scene resources have finished to load in background."),
+                    _("Scene _PARAM1_ was preloaded in background"),
+                    "",
+                    "res/actions/hourglass_black.svg",
+                    "res/actions/hourglass_black.svg")
+      .SetHelpPath("/all-features/resources-loading")
+      .AddCodeOnlyParameter("currentScene", "")
+      .AddParameter("sceneName", _("Scene name"))
+      .MarkAsAdvanced();
 }
 
 }  // namespace gd

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

@@ -30,7 +30,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsSpriteExtension(
           .AddObject<SpriteObject>("Sprite",
                                    _("Sprite"),
                                    _("Animated object which can be used for "
-                                     "most elements of a game"),
+                                     "most elements of a game."),
                                    "CppPlatform/Extensions/spriteicon.png")
           .SetCategoryFullName(_("General"))
           .AddDefaultBehavior("EffectCapability::EffectBehavior")
@@ -408,6 +408,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsSpriteExtension(
       .SetHidden()
       .MarkAsSimple();
 
+  // Deprecated
   obj.AddCondition("ScaleWidth",
                    _("Scale on X axis"),
                    _("Compare the scale of the width of an object."),
@@ -415,7 +416,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsSpriteExtension(
                    _("Size"),
                    "res/conditions/scaleWidth24_black.png",
                    "res/conditions/scaleWidth_black.png")
-
+      .SetHidden()
       .AddParameter("object", _("Object"), "Sprite")
       .UseStandardRelationalOperatorParameters(
           "number",
@@ -423,6 +424,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsSpriteExtension(
               _("Scale (1 by default)")))
       .MarkAsAdvanced();
 
+  // Deprecated
   obj.AddCondition("ScaleHeight",
                    _("Scale on Y axis"),
                    _("Compare the scale of the height of an object."),
@@ -430,7 +432,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsSpriteExtension(
                    _("Size"),
                    "res/conditions/scaleHeight24_black.png",
                    "res/conditions/scaleHeight_black.png")
-
+      .SetHidden()
       .AddParameter("object", _("Object"), "Sprite")
       .UseStandardRelationalOperatorParameters(
           "number",

Core/GDCore/Extensions/Builtin/WindowExtension.cpp

@@ -87,8 +87,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsWindowExtension(
   extension
       .AddAction(
           "SetWindowSize",
-          _("Change the size of the game window"),
-          _("This action changes the size of the game window. Note that this "
+          _("Game window size"),
+          _("Changes the size of the game window. Note that this "
             "will only work on platform supporting this operation: games "
             "running in browsers or on mobile phones can not update their "
             "window size. Game resolution can still be updated."),

Core/GDCore/Extensions/Metadata/ExpressionMetadata.cpp

@@ -5,6 +5,7 @@
  */
 #include "ExpressionMetadata.h"
 #include "GDCore/CommonTools.h"
+#include "GDCore/Extensions/PlatformExtension.h"
 #include "GDCore/String.h"
 
 namespace gd {
@@ -46,16 +47,14 @@ gd::ExpressionMetadata& ExpressionMetadata::AddParameter(
       // For objects/behavior, the supplementary information
       // parameter is an object/behavior type...
       ((gd::ParameterMetadata::IsObject(type) ||
-       gd::ParameterMetadata::IsBehavior(type))
-       // Prefix with the namespace if it's not already there.
-       && !(supplementaryInformation.rfind(extensionNamespace, 0) == 0))
-          ? (supplementaryInformation.empty()
-                 ? ""
-                 : extensionNamespace +
-                       supplementaryInformation  //... so prefix it with the extension
-                                           // namespace.
-             )
-          : supplementaryInformation);  // Otherwise don't change anything
+        gd::ParameterMetadata::IsBehavior(type))
+               // Prefix with the namespace if it's not already there.
+               && (supplementaryInformation.find(
+                       PlatformExtension::GetNamespaceSeparator()) == gd::String::npos)
+           ? (supplementaryInformation.empty()
+                  ? ""
+                  : extensionNamespace + supplementaryInformation)
+           : supplementaryInformation));
 
   // TODO: Assert against supplementaryInformation === "emsc" (when running with
   // Emscripten), and warn about a missing argument when calling addParameter.

Core/GDCore/Extensions/Metadata/InstructionMetadata.cpp

@@ -8,6 +8,7 @@
 #include <algorithm>
 
 #include "GDCore/CommonTools.h"
+#include "GDCore/Extensions/PlatformExtension.h"
 #include "GDCore/Serialization/SerializerElement.h"
 #include "GDCore/Tools/Localization.h"
 #include "GDCore/Tools/Log.h"
@@ -64,17 +65,14 @@ InstructionMetadata& InstructionMetadata::AddParameter(
       // For objects/behavior, the supplementary information
       // parameter is an object/behavior type...
       ((gd::ParameterMetadata::IsObject(type) ||
-       gd::ParameterMetadata::IsBehavior(type))
-       // Prefix with the namespace if it's not already there.
-       && !(supplementaryInformation.rfind(extensionNamespace, 0) == 0))
-          ? (supplementaryInformation.empty()
-                 ? ""
-                 : extensionNamespace +
-                       supplementaryInformation  //... so prefix it with the
-                                                 // extension
-                                                 // namespace.
-             )
-          : supplementaryInformation);  // Otherwise don't change anything
+        gd::ParameterMetadata::IsBehavior(type))
+               // Prefix with the namespace if it's not already there.
+               && (supplementaryInformation.find(
+                       PlatformExtension::GetNamespaceSeparator()) == gd::String::npos)
+           ? (supplementaryInformation.empty()
+                  ? ""
+                  : extensionNamespace + supplementaryInformation)
+           : supplementaryInformation));
 
   // TODO: Assert against supplementaryInformation === "emsc" (when running with
   // Emscripten), and warn about a missing argument when calling addParameter.
@@ -190,7 +188,7 @@ InstructionMetadata::UseStandardRelationalOperatorParameters(
       gd::String templateSentence = _("<subject> of _PARAM0_ <operator> <value>");
 
       sentence =
-          templateSentence.FindAndReplace("<subject>", sentence)
+          templateSentence.FindAndReplace("<subject>", sentence.CapitalizeFirstLetter())
               .FindAndReplace(
                   "<operator>",
                   "_PARAM" + gd::String::From(operatorParamIndex) + "_")
@@ -200,7 +198,7 @@ InstructionMetadata::UseStandardRelationalOperatorParameters(
       gd::String templateSentence = _("<subject> <operator> <value>");
 
       sentence =
-          templateSentence.FindAndReplace("<subject>", sentence)
+          templateSentence.FindAndReplace("<subject>", sentence.CapitalizeFirstLetter())
               .FindAndReplace(
                   "<operator>",
                   "_PARAM" + gd::String::From(operatorParamIndex) + "_")

Core/GDCore/Extensions/Metadata/MultipleInstructionMetadata.h

@@ -191,6 +191,16 @@ class GD_CORE_API MultipleInstructionMetadata : public AbstractFunctionMetadata
     return *this;
   }
 
+  /**
+   * \see gd::InstructionMetadata::SetHelpPath
+   */
+  MultipleInstructionMetadata &SetHelpPath(const gd::String &path) {
+    if (expression) expression->SetHelpPath(path);
+    if (condition) condition->SetHelpPath(path);
+    if (action) action->SetHelpPath(path);
+    return *this;
+  }
+
   /**
    * \see gd::InstructionMetadata::MarkAsSimple
    */

Core/GDCore/Extensions/Metadata/ObjectMetadata.h

@@ -303,12 +303,24 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
     return *this;
   }
 
-
   /**
-   * \brief Return true if the instruction must be hidden in the IDE.
+   * \brief Return true if the object must be hidden in the IDE.
    */
   bool IsHidden() const { return hidden; }
 
+  /**
+   * \brief Declare a usage of the 3D renderer.
+   */
+  ObjectMetadata &MarkAsRenderedIn3D() {
+    isRenderedIn3D = true;
+    return *this;
+  }
+
+  /**
+   * \brief Return true if the object uses the 3D renderer.
+   */
+  bool IsRenderedIn3D() const { return isRenderedIn3D; }
+
   std::map<gd::String, gd::InstructionMetadata> conditionsInfos;
   std::map<gd::String, gd::InstructionMetadata> actionsInfos;
   std::map<gd::String, gd::ExpressionMetadata> expressionsInfos;
@@ -329,6 +341,7 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
   gd::String categoryFullName;
   std::set<gd::String> defaultBehaviorTypes;
   bool hidden = false;
+  bool isRenderedIn3D = false;
 
   std::shared_ptr<gd::ObjectConfiguration>
       blueprintObject;  ///< The "blueprint" object to be copied when a new

Core/GDCore/Extensions/Metadata/ParameterMetadataTools.cpp

@@ -60,10 +60,10 @@ void ParameterMetadataTools::ParametersToObjectsContainer(
   }
 }
 
-void ParameterMetadataTools::ForEachParameterWithPrefix(
+void ParameterMetadataTools::ForEachParameterMatchingSearch(
     const std::vector<const std::vector<gd::ParameterMetadata>*>&
         parametersVectorsList,
-    const gd::String& prefix,
+    const gd::String& search,
     std::function<void(const gd::ParameterMetadata&)> cb) {
   for (auto it = parametersVectorsList.rbegin();
        it != parametersVectorsList.rend();
@@ -71,7 +71,7 @@ void ParameterMetadataTools::ForEachParameterWithPrefix(
     const std::vector<gd::ParameterMetadata>* parametersVector = *it;
 
     for (const auto& parameterMetadata: *parametersVector) {
-      if (parameterMetadata.GetName().find(prefix) == 0) cb(parameterMetadata);
+      if (parameterMetadata.GetName().FindCaseInsensitive(search) != gd::String::npos) cb(parameterMetadata);
     }
   }
 }

Core/GDCore/Extensions/Metadata/ParameterMetadataTools.h

@@ -27,9 +27,9 @@ class GD_CORE_API ParameterMetadataTools {
       const std::vector<gd::ParameterMetadata>& parameters,
       gd::ObjectsContainer& outputObjectsContainer);
 
-  static void ForEachParameterWithPrefix(
+  static void ForEachParameterMatchingSearch(
       const std::vector<const std::vector<gd::ParameterMetadata>*>& parametersVectorsList,
-      const gd::String& prefix,
+      const gd::String& search,
       std::function<void(const gd::ParameterMetadata&)> cb);
 
   static bool Has(

Core/GDCore/Extensions/Metadata/ValueTypeMetadata.h

@@ -217,7 +217,9 @@ class GD_CORE_API ValueTypeMetadata {
              parameterType == "jsonResource" ||
              parameterType == "tilemapResource" ||
              parameterType == "tilesetResource" ||
-             parameterType == "model3DResource";
+             parameterType == "model3DResource" ||
+             parameterType == "atlasResource" ||
+             parameterType == "spineResource";
     }
     return false;
   }

Core/GDCore/Extensions/PlatformExtension.h

@@ -264,8 +264,11 @@ class GD_CORE_API PlatformExtension {
    *
    * \param name The name of the behavior
    * \param fullname The user friendly name of the behavior
+   * \param defaultName The default name of behavior instances
    * \param description The user friendly description of the behavior
+   * \param group The behavior category label
    * \param icon The icon of the behavior.
+   * \param className The name of the class implementing the behavior
    * \param instance An instance of the behavior that
    * will be used to create the behavior
    * \param sharedDatasInstance Optional
@@ -288,6 +291,7 @@ class GD_CORE_API PlatformExtension {
    * \param name The name of the behavior
    * \param fullname The user friendly name of the behavior
    * \param description The user friendly description of the behavior
+   * \param group The behavior category label
    * \param icon The icon of the behavior.
    */
   gd::BehaviorMetadata& AddEventsBasedBehavior(

Core/GDCore/IDE/DependenciesAnalyzer.cpp

@@ -4,7 +4,6 @@
  * reserved. This project is released under the MIT License.
  */
 
-#if defined(GD_IDE_ONLY)
 #include "DependenciesAnalyzer.h"
 #include <algorithm>
 #include "GDCore/Events/Builtin/LinkEvent.h"
@@ -29,9 +28,9 @@ DependenciesAnalyzer::DependenciesAnalyzer(const gd::Project& project_,
 
 bool DependenciesAnalyzer::Analyze() {
   if (layout)
-    return Analyze(layout->GetEvents(), true);
+    return Analyze(layout->GetEvents());
   else if (externalEvents)
-    return Analyze(externalEvents->GetEvents(), true);
+    return Analyze(externalEvents->GetEvents());
 
   std::cout << "ERROR: DependenciesAnalyzer called without any layout or "
                "external events.";
@@ -40,63 +39,38 @@ bool DependenciesAnalyzer::Analyze() {
 
 DependenciesAnalyzer::~DependenciesAnalyzer() {}
 
-bool DependenciesAnalyzer::Analyze(const gd::EventsList& events, bool isOnTopLevel) {
+bool DependenciesAnalyzer::Analyze(const gd::EventsList& events) {
   for (unsigned int i = 0; i < events.size(); ++i) {
     const gd::LinkEvent* linkEvent = dynamic_cast<const gd::LinkEvent*>(&events[i]);
     if (linkEvent) {
-      DependenciesAnalyzer analyzer(*this);
-
       gd::String linked = linkEvent->GetTarget();
       if (project.HasExternalEventsNamed(linked)) {
         if (std::find(parentExternalEvents.begin(),
                       parentExternalEvents.end(),
-                      linked) != parentExternalEvents.end())
-          return false;  // Circular dependency!
-
-        externalEventsDependencies.insert(
-            linked);  // There is a direct dependency
-        if (!isOnTopLevel) notTopLevelExternalEventsDependencies.insert(linked);
-        analyzer.AddParentExternalEvents(linked);
-        if (!analyzer.Analyze(project.GetExternalEvents(linked).GetEvents(),
-                              isOnTopLevel))
+                      linked) != parentExternalEvents.end()) {
+          // Circular dependency!
           return false;
-
+        }
+        bool wasDependencyJustAdded = externalEventsDependencies.insert(linked).second;
+        if (wasDependencyJustAdded) {
+          parentExternalEvents.push_back(linked);
+          if (!Analyze(project.GetExternalEvents(linked).GetEvents()))
+            return false;
+          parentExternalEvents.pop_back();
+        }
       } else if (project.HasLayoutNamed(linked)) {
         if (std::find(parentScenes.begin(), parentScenes.end(), linked) !=
-            parentScenes.end())
-          return false;  // Circular dependency!
-
-        scenesDependencies.insert(linked);  // There is a direct dependency
-        if (!isOnTopLevel) notTopLevelScenesDependencies.insert(linked);
-        analyzer.AddParentScene(linked);
-        if (!analyzer.Analyze(project.GetLayout(linked).GetEvents(),
-                              isOnTopLevel))
+            parentScenes.end()) {
+          // Circular dependency!
           return false;
-      }
-
-      // Update with indirect dependencies.
-      scenesDependencies.insert(analyzer.GetScenesDependencies().begin(),
-                                analyzer.GetScenesDependencies().end());
-      externalEventsDependencies.insert(
-          analyzer.GetExternalEventsDependencies().begin(),
-          analyzer.GetExternalEventsDependencies().end());
-      sourceFilesDependencies.insert(
-          analyzer.GetSourceFilesDependencies().begin(),
-          analyzer.GetSourceFilesDependencies().end());
-      notTopLevelScenesDependencies.insert(
-          analyzer.GetNotTopLevelScenesDependencies().begin(),
-          analyzer.GetNotTopLevelScenesDependencies().end());
-      notTopLevelExternalEventsDependencies.insert(
-          analyzer.GetNotTopLevelExternalEventsDependencies().begin(),
-          analyzer.GetNotTopLevelExternalEventsDependencies().end());
-
-      if (!isOnTopLevel) {
-        notTopLevelScenesDependencies.insert(
-            analyzer.GetScenesDependencies().begin(),
-            analyzer.GetScenesDependencies().end());
-        notTopLevelExternalEventsDependencies.insert(
-            analyzer.GetExternalEventsDependencies().begin(),
-            analyzer.GetExternalEventsDependencies().end());
+        }
+        bool wasDependencyJustAdded = scenesDependencies.insert(linked).second;
+        if (wasDependencyJustAdded) {
+          parentScenes.push_back(linked);
+          if (!Analyze(project.GetLayout(linked).GetEvents()))
+            return false;
+          parentScenes.pop_back();
+        }
       }
     }
 
@@ -112,45 +86,9 @@ bool DependenciesAnalyzer::Analyze(const gd::EventsList& events, bool isOnTopLev
 
     // Analyze sub events dependencies
     if (events[i].CanHaveSubEvents()) {
-      if (!Analyze(events[i].GetSubEvents(), false)) return false;
+      if (!Analyze(events[i].GetSubEvents())) return false;
     }
   }
 
   return true;
 }
-
-gd::String DependenciesAnalyzer::ExternalEventsCanBeCompiledForAScene() {
-  if (!externalEvents) {
-    std::cout << "ERROR: ExternalEventsCanBeCompiledForAScene called without "
-                 "external events set!"
-              << std::endl;
-    return "";
-  }
-
-  gd::String sceneName;
-  for (unsigned int i = 0; i < project.GetLayoutsCount(); ++i) {
-    // For each layout, compute the dependencies and the dependencies which are
-    // not coming from a top level event.
-    DependenciesAnalyzer analyzer(project, project.GetLayout(i));
-    if (!analyzer.Analyze()) continue;  // Analyze failed -> Cyclic dependencies
-    const std::set<gd::String>& dependencies =
-        analyzer.GetExternalEventsDependencies();
-    const std::set<gd::String>& notTopLevelDependencies =
-        analyzer.GetNotTopLevelExternalEventsDependencies();
-
-    // Check if the external events is a dependency, and that is is only present
-    // as a link on the top level.
-    if (dependencies.find(externalEvents->GetName()) != dependencies.end() &&
-        notTopLevelDependencies.find(externalEvents->GetName()) ==
-            notTopLevelDependencies.end()) {
-      if (!sceneName.empty())
-        return "";  // External events can be compiled only if one scene is
-                    // including them.
-      else
-        sceneName = project.GetLayout(i).GetName();
-    }
-  }
-
-  return sceneName;  // External events can be compiled and used for the scene.
-}
-#endif

Core/GDCore/IDE/DependenciesAnalyzer.h

@@ -39,11 +39,6 @@ class GD_CORE_API DependenciesAnalyzer {
 
   /**
    * \brief Constructor for analyzing the dependencies of external events.
-   *
-   * You can also call then
-   * DependenciesAnalyzer::ExternalEventsCanBeCompiledForAScene to check if the
-   * external events can be compiled separately and called by a scene. \see
-   * DependenciesAnalyzer::ExternalEventsCanBeCompiledForAScene
    */
   DependenciesAnalyzer(const gd::Project& project_,
                        const gd::ExternalEvents& externalEvents);
@@ -60,18 +55,6 @@ class GD_CORE_API DependenciesAnalyzer {
    */
   bool Analyze();
 
-  /**
-   * Check if the external events (passed in the constructor) can be compiled
-   * and called by a single scene:<br> This is possible when the link calling
-   * the external events does not have any parent event and when this situation
-   * occurs only in a single scene and not in another.
-   *
-   * \return The name of the scene which is able to call the compiled external
-   * events. If empty, no scene is able to call them. (So external events have
-   * to be included directly by links).
-   */
-  gd::String ExternalEventsCanBeCompiledForAScene();
-
   /**
    * \brief Return the scenes being dependencies of the scene or external events
    * passed in the constructor.
@@ -96,25 +79,6 @@ class GD_CORE_API DependenciesAnalyzer {
     return sourceFilesDependencies;
   };
 
-  /**
-   * \brief Return the scenes being dependencies of the scene or external events
-   * passed in the constructor, but being not top level dependencies: The links
-   * including them are not a top level events (i.e: They have a parent event).
-   */
-  const std::set<gd::String>& GetNotTopLevelScenesDependencies() const {
-    return notTopLevelScenesDependencies;
-  };
-
-  /**
-   * \brief Return the external events being dependencies of the scene or
-   * external events passed in the constructor, but being not top level
-   * dependencies: The links including them are not a top level events (i.e:
-   * They have a parent event).
-   */
-  const std::set<gd::String>& GetNotTopLevelExternalEventsDependencies() const {
-    return notTopLevelExternalEventsDependencies;
-  };
-
  private:
   /**
    * \brief Analyze the dependencies of the events.
@@ -124,32 +88,11 @@ class GD_CORE_API DependenciesAnalyzer {
    * (they have no parents). \return false if a circular dependency exists, true
    * otherwise.
    */
-  bool Analyze(const gd::EventsList& events, bool isOnTopLevel);
-
-  void AddParentScene(gd::String parentScene) {
-    parentScenes.push_back(parentScene);
-  };
-  void AddParentExternalEvents(gd::String parentExternalEvents_) {
-    parentExternalEvents.push_back(parentExternalEvents_);
-  };
-
-  /**
-   * Return true if all links pointing to external events called \a
-   * externalEventsName are only at the top level of \a events. The function
-   * return false as soon as it discover a link to external events which is not
-   * at the top level ( i.e: It has a parent event ).
-   *
-   * \warning The function assumes that there are not cyclic dependencies.
-   */
-  bool CheckIfExternalEventsIsLinkedOnlyAtTopLevel(
-      const gd::String& externalEventsName,
-      std::vector<std::shared_ptr<gd::BaseEvent> >& events);
+  bool Analyze(const gd::EventsList& events);
 
   std::set<gd::String> scenesDependencies;
   std::set<gd::String> externalEventsDependencies;
   std::set<gd::String> sourceFilesDependencies;
-  std::set<gd::String> notTopLevelScenesDependencies;
-  std::set<gd::String> notTopLevelExternalEventsDependencies;
   std::vector<gd::String>
       parentScenes;  ///< Used to check for circular dependencies.
   std::vector<gd::String>

Core/GDCore/IDE/Events/EventsContextAnalyzer.cpp

@@ -58,7 +58,7 @@ class GD_CORE_API ExpressionObjectsAnalyzer
   void OnVisitNumberNode(NumberNode& node) override {}
   void OnVisitTextNode(TextNode& node) override {}
   void OnVisitVariableNode(VariableNode& node) override {
-    auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers.GetObjectsContainersList(), rootType, node);
+    auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers, rootType, node);
 
     if (gd::ParameterMetadata::IsExpression("variable", type)) {
       // Nothing to do (this can't reference an object)
@@ -88,7 +88,7 @@ class GD_CORE_API ExpressionObjectsAnalyzer
     if (node.child) node.child->Visit(*this);
   }
   void OnVisitIdentifierNode(IdentifierNode& node) override {
-    auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers.GetObjectsContainersList(), rootType, node);
+    auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers, rootType, node);
     if (gd::ParameterMetadata::IsObject(type)) {
       context.AddObjectName(projectScopedContainers, node.identifierName);
     } else if (gd::ParameterMetadata::IsExpression("variable", type)) {

Core/GDCore/IDE/Events/EventsIdentifiersFinder.cpp

@@ -226,7 +226,7 @@ void EventsIdentifiersFinder::FindArgumentsInEventsAndDependencies(
   eventWorker.Launch(layout.GetEvents(),
       gd::ProjectScopedContainers::MakeNewProjectScopedContainersForProjectAndLayout(project, layout));
 
-  DependenciesAnalyzer dependenciesAnalyzer = DependenciesAnalyzer(project, layout);
+  DependenciesAnalyzer dependenciesAnalyzer(project, layout);
   dependenciesAnalyzer.Analyze();
   for (const gd::String& externalEventName : dependenciesAnalyzer.GetExternalEventsDependencies()) {
     const gd::ExternalEvents& externalEvents = project.GetExternalEvents(externalEventName);

Core/GDCore/IDE/Events/EventsRefactorer.cpp

@@ -81,8 +81,7 @@ class GD_CORE_API ExpressionObjectRenamer : public ExpressionParser2NodeWorker {
   void OnVisitNumberNode(NumberNode& node) override {}
   void OnVisitTextNode(TextNode& node) override {}
   void OnVisitVariableNode(VariableNode& node) override {
-    const auto& objectsContainersList = projectScopedContainers.GetObjectsContainersList();
-    auto type = gd::ExpressionTypeFinder::GetType(platform, objectsContainersList, rootType, node);
+    auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers, rootType, node);
 
     if (gd::ValueTypeMetadata::IsTypeLegacyPreScopedVariable(type)) {
       // Nothing to do (this can't reference an object)
@@ -115,7 +114,7 @@ class GD_CORE_API ExpressionObjectRenamer : public ExpressionParser2NodeWorker {
     if (node.child) node.child->Visit(*this);
   }
   void OnVisitIdentifierNode(IdentifierNode& node) override {
-    auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers.GetObjectsContainersList(), rootType, node);
+    auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers, rootType, node);
     if (gd::ParameterMetadata::IsObject(type) &&
         node.identifierName == objectName) {
       hasDoneRenaming = true;
@@ -217,8 +216,7 @@ class GD_CORE_API ExpressionObjectFinder : public ExpressionParser2NodeWorker {
   void OnVisitNumberNode(NumberNode& node) override {}
   void OnVisitTextNode(TextNode& node) override {}
   void OnVisitVariableNode(VariableNode& node) override {
-    const auto& objectsContainersList = projectScopedContainers.GetObjectsContainersList();
-    auto type = gd::ExpressionTypeFinder::GetType(platform, objectsContainersList, rootType, node);
+    auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers, rootType, node);
 
     if (gd::ValueTypeMetadata::IsTypeLegacyPreScopedVariable(type)) {
       // Nothing to do (this can't reference an object)
@@ -250,7 +248,7 @@ class GD_CORE_API ExpressionObjectFinder : public ExpressionParser2NodeWorker {
     if (node.child) node.child->Visit(*this);
   }
   void OnVisitIdentifierNode(IdentifierNode& node) override {
-    auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers.GetObjectsContainersList(), rootType, node);
+    auto type = gd::ExpressionTypeFinder::GetType(platform, projectScopedContainers, rootType, node);
     if (gd::ParameterMetadata::IsObject(type) &&
         node.identifierName == searchedObjectName) {
       hasObject = true;

Core/GDCore/IDE/Events/EventsVariableReplacer.cpp

@@ -136,7 +136,7 @@ class GD_CORE_API ExpressionVariableReplacer
     auto& objectsContainersList =
         projectScopedContainers.GetObjectsContainersList();
     if (!objectNameToUseForVariableAccessor.empty()) {
-      if (objectsContainersList.HasVariablesContainer(
+      if (objectsContainersList.HasObjectOrGroupVariablesContainer(
               objectNameToUseForVariableAccessor, targetVariablesContainer)) {
         // The node represents an object variable, and this object variables are
         // the target. Do the replacement or removals:
@@ -177,7 +177,7 @@ class GD_CORE_API ExpressionVariableReplacer
         GetPotentialNewName(node.identifierName),
         [&]() {
           // This represents an object.
-          if (objectsContainersList.HasVariablesContainer(
+          if (objectsContainersList.HasObjectOrGroupVariablesContainer(
                   node.identifierName, targetVariablesContainer)) {
             // The node represents an object variable, and this object variables
             // are the target. Do the replacement or removals:

Core/GDCore/IDE/Events/EventsVariablesFinder.cpp

@@ -258,7 +258,7 @@ void EventsVariablesFinder::FindArgumentsInEventsAndDependencies(
   eventWorker.Launch(layout.GetEvents(),
       gd::ProjectScopedContainers::MakeNewProjectScopedContainersForProjectAndLayout(project, layout));
 
-  DependenciesAnalyzer dependenciesAnalyzer = DependenciesAnalyzer(project, layout);
+  DependenciesAnalyzer dependenciesAnalyzer(project, layout);
   dependenciesAnalyzer.Analyze();
   for (const gd::String& externalEventName : dependenciesAnalyzer.GetExternalEventsDependencies()) {
     const gd::ExternalEvents& externalEvents = project.GetExternalEvents(externalEventName);

Core/GDCore/IDE/Events/ExpressionCompletionFinder.h

@@ -11,13 +11,16 @@
 
 #include "GDCore/Events/Parsers/ExpressionParser2.h"
 #include "GDCore/Events/Parsers/ExpressionParser2Node.h"
+#include "GDCore/Events/Parsers/ExpressionParser2NodePrinter.h"
 #include "GDCore/Events/Parsers/ExpressionParser2NodeWorker.h"
+#include "GDCore/Events/Parsers/GrammarTerminals.h"
 #include "GDCore/Extensions/Metadata/ExpressionMetadata.h"
 #include "GDCore/Extensions/Metadata/InstructionMetadata.h"
 #include "GDCore/Extensions/Metadata/ValueTypeMetadata.h"
 #include "GDCore/IDE/Events/ExpressionNodeLocationFinder.h"
 #include "GDCore/IDE/Events/ExpressionTypeFinder.h"
 #include "GDCore/IDE/Events/ExpressionVariableOwnerFinder.h"
+#include "GDCore/IDE/Events/ExpressionVariableParentFinder.h"
 #include "GDCore/Project/ProjectScopedContainers.h"
 #include "GDCore/Project/Variable.h"
 
@@ -395,12 +398,10 @@ class GD_CORE_API ExpressionCompletionFinder
 
  protected:
   void OnVisitSubExpressionNode(SubExpressionNode& node) override {
-    const auto& objectsContainersList =
-        projectScopedContainers.GetObjectsContainersList();
     auto type = gd::ExpressionTypeFinder::GetType(
-        platform, objectsContainersList, rootType, node);
+        platform, projectScopedContainers, rootType, node);
 
-    AddCompletionsForAllIdentifiersWithPrefix("", type);
+    AddCompletionsForAllIdentifiersMatchingSearch("", type);
     completions.push_back(
         ExpressionCompletionDescription::ForExpressionWithPrefix(
             type, "", searchedPosition + 1, searchedPosition + 1));
@@ -409,12 +410,10 @@ class GD_CORE_API ExpressionCompletionFinder
     // No completions.
   }
   void OnVisitUnaryOperatorNode(UnaryOperatorNode& node) override {
-    const auto& objectsContainersList =
-        projectScopedContainers.GetObjectsContainersList();
     auto type = gd::ExpressionTypeFinder::GetType(
-        platform, objectsContainersList, rootType, node);
+        platform, projectScopedContainers, rootType, node);
 
-    AddCompletionsForAllIdentifiersWithPrefix("", type);
+    AddCompletionsForAllIdentifiersMatchingSearch("", type);
     completions.push_back(
         ExpressionCompletionDescription::ForExpressionWithPrefix(
             type, "", searchedPosition + 1, searchedPosition + 1));
@@ -488,90 +487,143 @@ class GD_CORE_API ExpressionCompletionFinder
     const auto& objectsContainersList =
         projectScopedContainers.GetObjectsContainersList();
     auto type = gd::ExpressionTypeFinder::GetType(
-        platform, objectsContainersList, rootType, node);
+        platform, projectScopedContainers, rootType, node);
+
+    // Only attempt to complete with the children of the variable
+    // if it's the last child (no more `.AnotherVariable` written after).
+    bool eagerlyCompleteIfExactMatch = node.child == nullptr;
 
     if (gd::ValueTypeMetadata::IsTypeLegacyPreScopedVariable(type)) {
-      const gd::VariablesContainer* variablesContainer = nullptr;
-      if (type == "globalvar") {
-        variablesContainer =
-            projectScopedContainers.GetVariablesContainersList()
-                .GetTopMostVariablesContainer();
-      } else if (type == "scenevar") {
-        variablesContainer =
-            projectScopedContainers.GetVariablesContainersList()
-                .GetBottomMostVariablesContainer();
+      if (type == "globalvar" || type == "scenevar") {
+        const auto* variablesContainer =
+            type == "globalvar"
+                ? projectScopedContainers.GetVariablesContainersList()
+                      .GetTopMostVariablesContainer()
+                : projectScopedContainers.GetVariablesContainersList()
+                      .GetBottomMostVariablesContainer();
+        if (variablesContainer) {
+          AddCompletionsForVariablesMatchingSearch(*variablesContainer,
+                                                   node.name,
+                                                   node.nameLocation,
+                                                   eagerlyCompleteIfExactMatch);
+        }
       } else if (type == "objectvar") {
         auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(
-            platform,
-            objectsContainersList,
-            // Variable fields doesn't use expression completion,
-            // so the object will be found inside the expression itself.
-            "",
-            node);
-        variablesContainer =
-            objectsContainersList.GetObjectOrGroupVariablesContainer(
-                objectName);
-      }
+            platform, objectsContainersList, rootObjectName, node);
 
-      if (variablesContainer) {
-        AddCompletionsForVariablesWithPrefix(
-            *variablesContainer, node.name, node.nameLocation);
+        AddCompletionsForObjectOrGroupVariablesMatchingSearch(
+            objectsContainersList,
+            objectName,
+            node.name,
+            node.nameLocation,
+            eagerlyCompleteIfExactMatch);
       }
     } else {
-      AddCompletionsForObjectsAndVariablesWithPrefix(
-          node.name, type, node.nameLocation);
+      AddCompletionsForObjectsAndVariablesMatchingSearch(
+          node.name, type, node.nameLocation, eagerlyCompleteIfExactMatch);
     }
   }
   void OnVisitVariableAccessorNode(VariableAccessorNode& node) override {
-    // No completions
+    VariableAndItsParent variableAndItsParent =
+        gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+            platform, projectScopedContainers, node);
+
+    // If no child, we're at the end of a variable (like `GrandChild` in
+    // `Something.Child.GrandChild`) so we can complete eagerly children if we
+    // can.
+    gd::String eagerlyCompleteForVariableName =
+        node.child == nullptr ? node.name : "";
+    AddCompletionsForChildrenVariablesOf(variableAndItsParent,
+                                         node.nameLocation,
+                                         eagerlyCompleteForVariableName);
   }
   void OnVisitVariableBracketAccessorNode(
-      VariableBracketAccessorNode& node) override {
-    // No completions
-  }
+      VariableBracketAccessorNode& node) override {}
   void OnVisitIdentifierNode(IdentifierNode& node) override {
     const auto& objectsContainersList =
         projectScopedContainers.GetObjectsContainersList();
     auto type = gd::ExpressionTypeFinder::GetType(
-        platform, objectsContainersList, rootType, node);
+        platform, projectScopedContainers, rootType, node);
     if (gd::ParameterMetadata::IsObject(type)) {
       // Only show completions of objects if an object is required.
-      AddCompletionsForObjectWithPrefix(
+      AddCompletionsForObjectMatchingSearch(
           node.identifierName, type, node.location);
     } else if (gd::ValueTypeMetadata::IsTypeLegacyPreScopedVariable(type)) {
-      const gd::VariablesContainer* variablesContainer = nullptr;
-      if (type == "globalvar") {
-        variablesContainer =
-            projectScopedContainers.GetVariablesContainersList()
-                .GetTopMostVariablesContainer();
-      } else if (type == "scenevar") {
-        variablesContainer =
-            projectScopedContainers.GetVariablesContainersList()
-                .GetBottomMostVariablesContainer();
+      if (type == "globalvar" || type == "scenevar") {
+        const auto* variablesContainer =
+            type == "globalvar"
+                ? projectScopedContainers.GetVariablesContainersList()
+                      .GetTopMostVariablesContainer()
+                : projectScopedContainers.GetVariablesContainersList()
+                      .GetBottomMostVariablesContainer();
+        if (variablesContainer) {
+          if (IsCaretOn(node.identifierNameDotLocation) ||
+              IsCaretOn(node.childIdentifierNameLocation)) {
+            // Complete a potential child variable:
+            if (variablesContainer->Has(node.identifierName)) {
+              AddCompletionsForChildrenVariablesOf(
+                  &variablesContainer->Get(node.identifierName),
+                  node.childIdentifierNameLocation,
+                  node.childIdentifierName);
+            }
+          } else {
+            // Complete a root variable of the scene or project.
+
+            // Don't attempt to complete children variables if there is
+            // already a dot written (`MyVariable.`).
+            bool eagerlyCompleteIfPossible =
+                !node.identifierNameDotLocation.IsValid();
+            AddCompletionsForVariablesMatchingSearch(
+                *variablesContainer,
+                node.identifierName,
+                node.identifierNameLocation,
+                eagerlyCompleteIfPossible);
+          }
+        }
       } else if (type == "objectvar") {
         auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(
-            platform,
-            objectsContainersList,
-            // Variable fields doesn't use expression completion,
-            // so the object will be found inside the expression itself.
-            "",
-            node);
-        variablesContainer =
-            objectsContainersList.GetObjectOrGroupVariablesContainer(
-                objectName);
-      }
+            platform, objectsContainersList, rootObjectName, node);
 
-      if (variablesContainer) {
-        AddCompletionsForVariablesWithPrefix(*variablesContainer,
-                                             node.identifierName,
-                                             node.identifierNameLocation);
+        if (IsCaretOn(node.identifierNameDotLocation) ||
+            IsCaretOn(node.childIdentifierNameLocation)) {
+          // Complete a potential child variable:
+          const auto* variablesContainer =
+              objectsContainersList.GetObjectOrGroupVariablesContainer(
+                  objectName);
+          if (variablesContainer &&
+              variablesContainer->Has(node.identifierName)) {
+            AddCompletionsForChildrenVariablesOf(
+                &variablesContainer->Get(node.identifierName),
+                node.childIdentifierNameLocation,
+                node.childIdentifierName);
+          }
+        } else {
+          // Complete a root variable of the object.
+
+          // Don't attempt to complete children variables if there is
+          // already a dot written (`MyVariable.`).
+          bool eagerlyCompleteIfPossible =
+              !node.identifierNameDotLocation.IsValid();
+          AddCompletionsForObjectOrGroupVariablesMatchingSearch(
+              objectsContainersList,
+              objectName,
+              node.identifierName,
+              node.identifierNameLocation,
+              eagerlyCompleteIfPossible);
+        }
       }
     } else {
       // Object function, behavior name, variable, object variable.
       if (IsCaretOn(node.identifierNameLocation)) {
-        // Is this the proper position?
-        AddCompletionsForAllIdentifiersWithPrefix(
-            node.identifierName, type, node.identifierNameLocation);
+        // Don't attempt to complete children variables if there is
+        // already a dot written (`MyVariable.`).
+        bool eagerlyCompleteIfPossible =
+            !node.identifierNameDotLocation.IsValid();
+        AddCompletionsForAllIdentifiersMatchingSearch(
+            node.identifierName,
+            type,
+            node.identifierNameLocation,
+            eagerlyCompleteIfPossible);
         if (!node.identifierNameDotLocation.IsValid()) {
           completions.push_back(
               ExpressionCompletionDescription::ForExpressionWithPrefix(
@@ -582,46 +634,69 @@ class GD_CORE_API ExpressionCompletionFinder
         }
       } else if (IsCaretOn(node.identifierNameDotLocation) ||
                  IsCaretOn(node.childIdentifierNameLocation)) {
-        const gd::String& objectName = node.identifierName;
+        // Might be:
+        // - An object variable, object behavior or object expression.
+        // - Or a variable with a child.
+        projectScopedContainers.MatchIdentifierWithName<void>(
+            node.identifierName,
+            [&]() {
+              // This is an object.
+              const gd::String& objectName = node.identifierName;
+              AddCompletionsForObjectOrGroupVariablesMatchingSearch(
+                  objectsContainersList,
+                  objectName,
+                  node.childIdentifierName,
+                  node.childIdentifierNameLocation,
+                  true);
 
-        // Might be an object variable, object behavior or object expression:
-        const auto* variablesContainer =
-            projectScopedContainers.GetObjectsContainersList()
-                .GetObjectOrGroupVariablesContainer(objectName);
-        if (variablesContainer) {
-          AddCompletionsForVariablesWithPrefix(
-              *variablesContainer,
-              node.childIdentifierName,
-              node.childIdentifierNameLocation);
-        }
+              completions.push_back(
+                  ExpressionCompletionDescription::ForBehaviorWithPrefix(
+                      node.childIdentifierName,
+                      node.childIdentifierNameLocation.GetStartPosition(),
+                      node.childIdentifierNameLocation.GetEndPosition(),
+                      objectName));
+              completions.push_back(
+                  ExpressionCompletionDescription::ForExpressionWithPrefix(
+                      type,
+                      node.childIdentifierName,
+                      node.childIdentifierNameLocation.GetStartPosition(),
+                      node.childIdentifierNameLocation.GetEndPosition(),
+                      objectName));
+            },
+            [&]() {
+              // This is a variable.
+              VariableAndItsParent variableAndItsParent =
+                  gd::ExpressionVariableParentFinder::GetLastParentOfNode(
+                      platform, projectScopedContainers, node);
 
-        completions.push_back(
-            ExpressionCompletionDescription::ForBehaviorWithPrefix(
-                node.childIdentifierName,
-                node.childIdentifierNameLocation.GetStartPosition(),
-                node.childIdentifierNameLocation.GetEndPosition(),
-                objectName));
-        completions.push_back(
-            ExpressionCompletionDescription::ForExpressionWithPrefix(
-                type,
-                node.childIdentifierName,
-                node.childIdentifierNameLocation.GetStartPosition(),
-                node.childIdentifierNameLocation.GetEndPosition(),
-                objectName));
+              AddCompletionsForChildrenVariablesOf(
+                  variableAndItsParent,
+                  node.childIdentifierNameLocation,
+                  node.childIdentifierName);
+            },
+            [&]() {
+              // Ignore properties here.
+              // There is no support for "children" of properties.
+            },
+            [&]() {
+              // Ignore parameters here.
+              // There is no support for "children" of parameters.
+            },
+            [&]() {
+              // Ignore unrecognised identifiers here.
+            });
       }
     }
   }
   void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode& node) override {
-    const auto& objectsContainersList =
-        projectScopedContainers.GetObjectsContainersList();
     auto type = gd::ExpressionTypeFinder::GetType(
-        platform, objectsContainersList, rootType, node);
+        platform, projectScopedContainers, rootType, node);
     if (!node.behaviorFunctionName.empty() ||
         node.behaviorNameNamespaceSeparatorLocation.IsValid()) {
       // Behavior function (or behavior function being written, with the
       // function name missing)
       if (IsCaretOn(node.objectNameLocation)) {
-        AddCompletionsForObjectWithPrefix(
+        AddCompletionsForObjectMatchingSearch(
             node.objectName, type, node.objectNameLocation);
       } else if (IsCaretOn(node.objectNameDotLocation) ||
                  IsCaretOn(node.objectFunctionOrBehaviorNameLocation)) {
@@ -645,7 +720,7 @@ class GD_CORE_API ExpressionCompletionFinder
     } else {
       // Object function or behavior name
       if (IsCaretOn(node.objectNameLocation)) {
-        AddCompletionsForObjectWithPrefix(
+        AddCompletionsForObjectMatchingSearch(
             node.objectName, type, node.objectNameLocation);
       } else if (IsCaretOn(node.objectNameDotLocation) ||
                  IsCaretOn(node.objectFunctionOrBehaviorNameLocation)) {
@@ -666,17 +741,15 @@ class GD_CORE_API ExpressionCompletionFinder
     }
   }
   void OnVisitFunctionCallNode(FunctionCallNode& node) override {
-    const auto& objectsContainersList =
-        projectScopedContainers.GetObjectsContainersList();
     auto type = gd::ExpressionTypeFinder::GetType(
-        platform, objectsContainersList, rootType, node);
+        platform, projectScopedContainers, rootType, node);
     bool isCaretOnParenthesis = IsCaretOn(node.openingParenthesisLocation) ||
                                 IsCaretOn(node.closingParenthesisLocation);
 
     if (!node.behaviorName.empty()) {
       // Behavior function
       if (IsCaretOn(node.objectNameLocation)) {
-        AddCompletionsForObjectWithPrefix(
+        AddCompletionsForObjectMatchingSearch(
             node.objectName, type, node.objectNameLocation);
       } else if (IsCaretOn(node.objectNameDotLocation) ||
                  IsCaretOn(node.behaviorNameLocation)) {
@@ -700,7 +773,7 @@ class GD_CORE_API ExpressionCompletionFinder
     } else if (!node.objectName.empty()) {
       // Object function
       if (IsCaretOn(node.objectNameLocation)) {
-        AddCompletionsForObjectWithPrefix(
+        AddCompletionsForObjectMatchingSearch(
             node.objectName, type, node.objectNameLocation);
       } else {
         // Add completions for behaviors, because we could imagine that the user
@@ -738,12 +811,11 @@ class GD_CORE_API ExpressionCompletionFinder
     }
   }
   void OnVisitEmptyNode(EmptyNode& node) override {
-    const auto& objectsContainersList =
-        projectScopedContainers.GetObjectsContainersList();
     auto type = gd::ExpressionTypeFinder::GetType(
-        platform, objectsContainersList, rootType, node);
+        platform, projectScopedContainers, rootType, node);
 
-    AddCompletionsForAllIdentifiersWithPrefix(node.text, type, node.location);
+    AddCompletionsForAllIdentifiersMatchingSearch(
+        node.text, type, node.location);
     completions.push_back(
         ExpressionCompletionDescription::ForExpressionWithPrefix(
             type,
@@ -762,12 +834,98 @@ class GD_CORE_API ExpressionCompletionFinder
              (inclusive && searchedPosition <= location.GetEndPosition())));
   }
 
-  void AddCompletionsForVariablesWithPrefix(
-      const gd::VariablesContainer& variablesContainer,
-      const gd::String& prefix,
+  /**
+   * A slightly less strict check than `gd::Project::IsNameSafe` as child
+   * variables can be completed even if they start with a number.
+   */
+  bool IsIdentifierSafe(const gd::String& name) {
+    if (name.empty()) return false;
+
+    for (auto character : name) {
+      if (!GrammarTerminals::IsAllowedInIdentifier(character)) {
+        return false;
+      }
+    }
+
+    return true;
+  }
+
+  void AddCompletionsForChildrenVariablesOf(
+      VariableAndItsParent variableAndItsParent,
+      const ExpressionParserLocation& location,
+      gd::String eagerlyCompleteForVariableName = "") {
+    if (variableAndItsParent.parentVariable) {
+      AddCompletionsForChildrenVariablesOf(variableAndItsParent.parentVariable,
+                                           location,
+                                           eagerlyCompleteForVariableName);
+    } else if (variableAndItsParent.parentVariablesContainer) {
+      AddCompletionsForVariablesMatchingSearch(
+          *variableAndItsParent.parentVariablesContainer, "", location);
+    }
+  }
+
+  void AddCompletionsForChildrenVariablesOf(
+      const gd::Variable* variable,
+      const ExpressionParserLocation& location,
+      gd::String eagerlyCompleteForVariableName = "") {
+    if (!variable) return;
+
+    if (variable->GetType() == gd::Variable::Structure) {
+      for (const auto& name : variable->GetAllChildrenNames()) {
+        if (!IsIdentifierSafe(name)) continue;
+
+        const auto& childVariable = variable->GetChild(name);
+        ExpressionCompletionDescription description(
+            ExpressionCompletionDescription::Variable,
+            location.GetStartPosition(),
+            location.GetEndPosition());
+        description.SetCompletion(name);
+        description.SetVariableType(childVariable.GetType());
+        completions.push_back(description);
+
+        if (name == eagerlyCompleteForVariableName) {
+          AddEagerCompletionForVariableChildren(childVariable, name, location);
+        }
+      }
+    } else {
+      // TODO: we could do a "comment only completion" to indicate that nothing
+      // can/should be completed?
+    }
+  }
+
+  void AddEagerCompletionForVariableChildren(
+      const gd::Variable& variable,
+      const gd::String& variableName,
       const ExpressionParserLocation& location) {
-    variablesContainer.ForEachVariableWithPrefix(
-        prefix,
+    if (variable.GetType() == gd::Variable::Structure) {
+      gd::String prefix = variableName + ".";
+      for (const auto& name : variable.GetAllChildrenNames()) {
+        gd::String completion =
+            IsIdentifierSafe(name)
+                ? (prefix + name)
+                : (variableName + "[" +
+                   gd::ExpressionParser2NodePrinter::PrintStringLiteral(name) +
+                   "]");
+
+        const auto& childVariable = variable.GetChild(name);
+        ExpressionCompletionDescription description(
+            ExpressionCompletionDescription::Variable,
+            location.GetStartPosition(),
+            location.GetEndPosition());
+        description.SetCompletion(completion);
+        description.SetVariableType(childVariable.GetType());
+        completions.push_back(description);
+      }
+    }
+  }
+
+  void AddCompletionsForVariablesMatchingSearch(
+      const gd::VariablesContainer& variablesContainer,
+      const gd::String& search,
+      const ExpressionParserLocation& location,
+      bool eagerlyCompleteIfExactMatch = false) {
+    variablesContainer.ForEachVariableMatchingSearch(
+        search,
         [&](const gd::String& variableName, const gd::Variable& variable) {
           ExpressionCompletionDescription description(
               ExpressionCompletionDescription::Variable,
@@ -776,34 +934,66 @@ class GD_CORE_API ExpressionCompletionFinder
           description.SetCompletion(variableName);
           description.SetVariableType(variable.GetType());
           completions.push_back(description);
+
+          if (eagerlyCompleteIfExactMatch && variableName == search) {
+            AddEagerCompletionForVariableChildren(
+                variable, variableName, location);
+          }
         });
   }
 
-  void AddCompletionsForObjectWithPrefix(
-      const gd::String& prefix,
-      const gd::String& type,
-      const ExpressionParserLocation& location) {
-    projectScopedContainers.GetObjectsContainersList().ForEachNameWithPrefix(
-        prefix,
-        [&](const gd::String& name,
-            const gd::ObjectConfiguration* objectConfiguration) {
+  void AddCompletionsForObjectOrGroupVariablesMatchingSearch(
+      const gd::ObjectsContainersList& objectsContainersList,
+      const gd::String& objectOrGroupName,
+      const gd::String& search,
+      const ExpressionParserLocation& location,
+      bool eagerlyCompleteIfExactMatch) {
+    objectsContainersList.ForEachObjectOrGroupVariableMatchingSearch(
+        objectOrGroupName,
+        search,
+        [&](const gd::String& variableName, const gd::Variable& variable) {
           ExpressionCompletionDescription description(
-              ExpressionCompletionDescription::Object,
+              ExpressionCompletionDescription::Variable,
               location.GetStartPosition(),
               location.GetEndPosition());
-          description.SetObjectConfiguration(objectConfiguration);
-          description.SetCompletion(name);
-          description.SetType(type);
+          description.SetCompletion(variableName);
+          description.SetVariableType(variable.GetType());
           completions.push_back(description);
+
+          if (eagerlyCompleteIfExactMatch && variableName == search) {
+            AddEagerCompletionForVariableChildren(
+                variable, variableName, location);
+          }
         });
   }
 
-  void AddCompletionsForObjectsAndVariablesWithPrefix(
-      const gd::String& prefix,
+  void AddCompletionsForObjectMatchingSearch(
+      const gd::String& search,
       const gd::String& type,
       const ExpressionParserLocation& location) {
-    projectScopedContainers.ForEachIdentifierWithPrefix(
-        prefix,
+    projectScopedContainers.GetObjectsContainersList()
+        .ForEachNameMatchingSearch(
+            search,
+            [&](const gd::String& name,
+                const gd::ObjectConfiguration* objectConfiguration) {
+              ExpressionCompletionDescription description(
+                  ExpressionCompletionDescription::Object,
+                  location.GetStartPosition(),
+                  location.GetEndPosition());
+              description.SetObjectConfiguration(objectConfiguration);
+              description.SetCompletion(name);
+              description.SetType(type);
+              completions.push_back(description);
+            });
+  }
+
+  void AddCompletionsForObjectsAndVariablesMatchingSearch(
+      const gd::String& search,
+      const gd::String& type,
+      const ExpressionParserLocation& location,
+      bool eagerlyCompleteIfExactMatch) {
+    projectScopedContainers.ForEachIdentifierMatchingSearch(
+        search,
         [&](const gd::String& objectName,
             const ObjectConfiguration* objectConfiguration) {
           ExpressionCompletionDescription description(
@@ -823,6 +1013,11 @@ class GD_CORE_API ExpressionCompletionFinder
           description.SetCompletion(variableName);
           description.SetVariableType(variable.GetType());
           completions.push_back(description);
+
+          if (eagerlyCompleteIfExactMatch && variableName == search) {
+            AddEagerCompletionForVariableChildren(
+                variable, variableName, location);
+          }
         },
         [&](const gd::NamedPropertyDescriptor& property) {
           // Ignore properties here.
@@ -832,20 +1027,21 @@ class GD_CORE_API ExpressionCompletionFinder
         });
   }
 
-  void AddCompletionsForAllIdentifiersWithPrefix(const gd::String& prefix,
-                                                 const gd::String& type) {
-    AddCompletionsForAllIdentifiersWithPrefix(
-        prefix,
+  void AddCompletionsForAllIdentifiersMatchingSearch(const gd::String& search,
+                                                     const gd::String& type) {
+    AddCompletionsForAllIdentifiersMatchingSearch(
+        search,
         type,
         ExpressionParserLocation(searchedPosition + 1, searchedPosition + 1));
   }
 
-  void AddCompletionsForAllIdentifiersWithPrefix(
-      const gd::String& prefix,
+  void AddCompletionsForAllIdentifiersMatchingSearch(
+      const gd::String& search,
       const gd::String& type,
-      const ExpressionParserLocation& location) {
-    projectScopedContainers.ForEachIdentifierWithPrefix(
-        prefix,
+      const ExpressionParserLocation& location,
+      bool eagerlyCompleteIfExactMatch = false) {
+    projectScopedContainers.ForEachIdentifierMatchingSearch(
+        search,
         [&](const gd::String& objectName,
             const ObjectConfiguration* objectConfiguration) {
           ExpressionCompletionDescription description(
@@ -865,6 +1061,11 @@ class GD_CORE_API ExpressionCompletionFinder
           description.SetCompletion(variableName);
           description.SetVariableType(variable.GetType());
           completions.push_back(description);
+
+          if (eagerlyCompleteIfExactMatch && variableName == search) {
+            AddEagerCompletionForVariableChildren(
+                variable, variableName, location);
+          }
         },
         [&](const gd::NamedPropertyDescriptor& property) {
           ExpressionCompletionDescription description(
@@ -892,11 +1093,14 @@ class GD_CORE_API ExpressionCompletionFinder
       const gd::String& rootType_,
       size_t searchedPosition_,
       gd::ExpressionNode* maybeParentNodeAtLocation_)
-      : platform(platform_),
+      : searchedPosition(searchedPosition_),
+        maybeParentNodeAtLocation(maybeParentNodeAtLocation_),
+        platform(platform_),
         projectScopedContainers(projectScopedContainers_),
         rootType(rootType_),
-        searchedPosition(searchedPosition_),
-        maybeParentNodeAtLocation(maybeParentNodeAtLocation_){};
+        rootObjectName("")  // Always empty, might be changed if variable fields
+                            // in the editor are changed to use completion.
+        {};
 
   std::vector<ExpressionCompletionDescription> completions;
   size_t searchedPosition;
@@ -905,6 +1109,7 @@ class GD_CORE_API ExpressionCompletionFinder
   const gd::Platform& platform;
   const gd::ProjectScopedContainers& projectScopedContainers;
   const gd::String rootType;
+  const gd::String rootObjectName;
 };
 
 }  // namespace gd

Core/GDCore/IDE/Events/ExpressionLeftSideTypeFinder.h

@@ -14,13 +14,12 @@
 #include "GDCore/Extensions/Metadata/MetadataProvider.h"
 #include "GDCore/Extensions/Metadata/ObjectMetadata.h"
 #include "GDCore/Extensions/Metadata/ParameterMetadata.h"
-#include "GDCore/Project/Layout.h"  // For GetTypeOfObject and GetTypeOfBehavior
+#include "GDCore/Project/ProjectScopedContainers.h"
 #include "GDCore/Tools/Localization.h"
 
 namespace gd {
 class Expression;
 class ObjectsContainer;
-class ObjectsContainersList;
 class Platform;
 class ParameterMetadata;
 class ExpressionMetadata;
@@ -41,10 +40,10 @@ class GD_CORE_API ExpressionLeftSideTypeFinder : public ExpressionParser2NodeWor
    * operations.
    */
   static const gd::String GetType(const gd::Platform &platform,
-                      const gd::ObjectsContainersList &objectsContainersList,
+                      const gd::ProjectScopedContainers &projectScopedContainers,
                       gd::ExpressionNode& node) {
     gd::ExpressionLeftSideTypeFinder typeFinder(
-        platform, objectsContainersList);
+        platform, projectScopedContainers);
     node.Visit(typeFinder);
     return typeFinder.GetType();
   }
@@ -53,9 +52,9 @@ class GD_CORE_API ExpressionLeftSideTypeFinder : public ExpressionParser2NodeWor
 
  protected:
   ExpressionLeftSideTypeFinder(const gd::Platform &platform_,
-                       const gd::ObjectsContainersList &objectsContainersList_)
+                       const gd::ProjectScopedContainers &projectScopedContainers_)
       : platform(platform_),
-        objectsContainersList(objectsContainersList_),
+        projectScopedContainers(projectScopedContainers_),
         type("unknown") {};
 
   const gd::String &GetType() {
@@ -67,6 +66,14 @@ class GD_CORE_API ExpressionLeftSideTypeFinder : public ExpressionParser2NodeWor
   }
   void OnVisitOperatorNode(OperatorNode& node) override {
     node.leftHandSide->Visit(*this);
+
+    // The type is decided by the first operand, unless it can (`number|string`)
+    // or should (`unknown`) be refined, in which case we go for the right
+    // operand (which got visited knowing the type of the first operand, so it's
+    // equal or strictly more precise than the left operand).
+    if (type == "unknown" || type == "number|string") {
+      node.rightHandSide->Visit(*this);
+    }
   }
   void OnVisitUnaryOperatorNode(UnaryOperatorNode& node) override {
     node.factor->Visit(*this);
@@ -83,7 +90,7 @@ class GD_CORE_API ExpressionLeftSideTypeFinder : public ExpressionParser2NodeWor
   }
   void OnVisitFunctionCallNode(FunctionCallNode& node) override {
     const gd::ExpressionMetadata &metadata = MetadataProvider::GetFunctionCallMetadata(
-        platform, objectsContainersList, node);
+        platform, projectScopedContainers.GetObjectsContainersList(), node);
     if (gd::MetadataProvider::IsBadExpressionMetadata(metadata)) {
       type = "unknown";
     }
@@ -93,12 +100,99 @@ class GD_CORE_API ExpressionLeftSideTypeFinder : public ExpressionParser2NodeWor
   }
   void OnVisitVariableNode(VariableNode& node) override {
     type = "unknown";
+
+    projectScopedContainers.MatchIdentifierWithName<void>(node.name,
+      [&]() {
+        // This represents an object.
+        // We could store it to explore the type of the variable, but in practice this
+        // is only called for structures/arrays with 2 levels, and we don't support structure
+        // type identification for now.
+      },
+      [&]() {
+        // This is a variable.
+        // We could store it to explore the type of the variable, but in practice this
+        // is only called for structures/arrays with 2 levels, and we don't support structure
+        // type identification for now.
+      }, [&]() {
+        // This is a property with more than one child - this is unsupported.
+      }, [&]() {
+        // This is a parameter with more than one child - this is unsupported.
+      }, [&]() {
+        // This is something else.
+        type = "unknown";
+      });
   }
   void OnVisitVariableAccessorNode(VariableAccessorNode& node) override {
     type = "unknown";
   }
   void OnVisitIdentifierNode(IdentifierNode& node) override {
     type = "unknown";
+    projectScopedContainers.MatchIdentifierWithName<void>(node.identifierName,
+      [&]() {
+        // It's an object variable.
+        if (projectScopedContainers.GetObjectsContainersList()
+                .HasObjectOrGroupWithVariableNamed(
+                    node.identifierName, node.childIdentifierName)
+              == ObjectsContainersList::VariableExistence::DoesNotExist) {
+          type = "unknown";
+          return;
+        }
+
+        auto variableType =
+            projectScopedContainers.GetObjectsContainersList()
+                .GetTypeOfObjectOrGroupVariable(node.identifierName,
+                                                node.childIdentifierName);
+        ReadTypeFromVariable(variableType);
+      },
+      [&]() {
+        // It's a variable.
+        const auto& variable =
+            projectScopedContainers.GetVariablesContainersList().Get(
+                node.identifierName);
+
+        if (node.childIdentifierName.empty()) {
+          ReadTypeFromVariable(variable.GetType());
+        } else {
+          if (!variable.HasChild(node.childIdentifierName)) {
+            type = "unknown";
+            return;
+          }
+
+          ReadTypeFromVariable(
+              variable.GetChild(node.childIdentifierName).GetType());
+        }
+      }, [&]() {
+        // This is a property.
+        const gd::NamedPropertyDescriptor& property = projectScopedContainers
+            .GetPropertiesContainersList().Get(node.identifierName).second;
+
+        if (property.GetType() == "Number") {
+          type = "number";
+        } else if (property.GetType() == "Boolean") {
+          // Nothing - we don't know the precise type (this could be used a string or as a number)
+        } else {
+          // Assume type is String or equivalent.
+          type = "string";
+        }
+      }, [&]() {
+        // It's a parameter.
+
+        const auto& parametersVectorsList = projectScopedContainers.GetParametersVectorsList();
+        const auto& parameter = gd::ParameterMetadataTools::Get(parametersVectorsList, node.identifierName);
+        const auto& valueTypeMetadata = parameter.GetValueTypeMetadata();
+        if (valueTypeMetadata.IsNumber()) {
+          type = "number";
+        } else if (valueTypeMetadata.IsString()) {
+          type = "string";
+        } else if (valueTypeMetadata.IsBoolean()) {
+          // Nothing - we don't know the precise type (this could be used as a string or as a number).
+        } else {
+          type = "unknown";
+        }
+      }, [&]() {
+        // This is something else.
+        type = "unknown";
+      });
   }
   void OnVisitEmptyNode(EmptyNode& node) override {
     type = "unknown";
@@ -108,10 +202,18 @@ class GD_CORE_API ExpressionLeftSideTypeFinder : public ExpressionParser2NodeWor
   }
 
  private:
+  void ReadTypeFromVariable(gd::Variable::Type variableType) {
+    if (variableType == gd::Variable::Number) {
+      type = "number";
+    } else if (variableType == gd::Variable::String) {
+      type = "string";
+    }
+  }
+
   gd::String type;
 
   const gd::Platform &platform;
-  const gd::ObjectsContainersList &objectsContainersList;
+  const gd::ProjectScopedContainers &projectScopedContainers;
   const gd::String rootType;
 };
 

Core/GDCore/IDE/Events/ExpressionTypeFinder.h

@@ -15,13 +15,12 @@
 #include "GDCore/Extensions/Metadata/MetadataProvider.h"
 #include "GDCore/Extensions/Metadata/ObjectMetadata.h"
 #include "GDCore/Extensions/Metadata/ParameterMetadata.h"
-#include "GDCore/Project/Layout.h" // For GetTypeOfObject and GetTypeOfBehavior
+#include "GDCore/Project/ProjectScopedContainers.h"
 #include "GDCore/Tools/Localization.h"
 
 namespace gd {
 class Expression;
 class ObjectsContainer;
-class ObjectsContainersList;
 class Platform;
 class ParameterMetadata;
 class ExpressionMetadata;
@@ -51,11 +50,11 @@ class GD_CORE_API ExpressionTypeFinder : public ExpressionParser2NodeWorker {
    * sub-expression that a given node represents.
    */
   static const gd::String GetType(const gd::Platform &platform,
-                      const gd::ObjectsContainersList &objectsContainersList,
+                      const gd::ProjectScopedContainers &projectScopedContainers,
                       const gd::String &rootType,
                       gd::ExpressionNode& node) {
     gd::ExpressionTypeFinder typeFinder(
-        platform, objectsContainersList, rootType);
+        platform, projectScopedContainers, rootType);
     node.Visit(typeFinder);
     return typeFinder.GetType();
   }
@@ -64,10 +63,10 @@ class GD_CORE_API ExpressionTypeFinder : public ExpressionParser2NodeWorker {
 
  protected:
   ExpressionTypeFinder(const gd::Platform &platform_,
-                       const gd::ObjectsContainersList &objectsContainersList_,
+                       const gd::ProjectScopedContainers &projectScopedContainers_,
                        const gd::String &rootType_)
       : platform(platform_),
-        objectsContainersList(objectsContainersList_),
+        projectScopedContainers(projectScopedContainers_),
         rootType(rootType_),
         type(ExpressionTypeFinder::unknownType),
         child(nullptr) {};
@@ -113,8 +112,12 @@ class GD_CORE_API ExpressionTypeFinder : public ExpressionParser2NodeWorker {
     }
     auto leftSideType = gd::ExpressionLeftSideTypeFinder::GetType(
         platform,
-        objectsContainersList,
+        projectScopedContainers,
         node);
+
+    // If we can infer a definitive number or string type, use it.
+    // Otherwise, we only know that it's number or string, and this can even
+    // be used as is at runtime.
     if (leftSideType == ExpressionTypeFinder::numberType
      || leftSideType == ExpressionTypeFinder::stringType) {
       type = leftSideType;
@@ -126,7 +129,7 @@ class GD_CORE_API ExpressionTypeFinder : public ExpressionParser2NodeWorker {
   void OnVisitFunctionCallNode(FunctionCallNode& node) override {
     if (child == nullptr) {
       const gd::ExpressionMetadata &metadata = MetadataProvider::GetFunctionCallMetadata(
-          platform, objectsContainersList, node);
+          platform, projectScopedContainers.GetObjectsContainersList(), node);
       if (gd::MetadataProvider::IsBadExpressionMetadata(metadata)) {
         VisitParent(node);
       }
@@ -138,7 +141,7 @@ class GD_CORE_API ExpressionTypeFinder : public ExpressionParser2NodeWorker {
       const gd::ParameterMetadata* parameterMetadata =
           gd::MetadataProvider::GetFunctionCallParameterMetadata(
               platform,
-              objectsContainersList,
+              projectScopedContainers.GetObjectsContainersList(),
               node,
               *child);
       if (parameterMetadata == nullptr || parameterMetadata->GetType().empty()) {
@@ -159,7 +162,7 @@ class GD_CORE_API ExpressionTypeFinder : public ExpressionParser2NodeWorker {
     else if (rootType == ExpressionTypeFinder::numberOrStringType) {
       auto leftSideType = gd::ExpressionLeftSideTypeFinder::GetType(
           platform,
-          objectsContainersList,
+          projectScopedContainers,
           node);
       if (leftSideType == ExpressionTypeFinder::numberType
        || leftSideType == ExpressionTypeFinder::stringType) {
@@ -183,7 +186,7 @@ class GD_CORE_API ExpressionTypeFinder : public ExpressionParser2NodeWorker {
   ExpressionNode *child;
 
   const gd::Platform &platform;
-  const gd::ObjectsContainersList &objectsContainersList;
+  const gd::ProjectScopedContainers &projectScopedContainers;
   const gd::String rootType;
 };
 

Core/GDCore/IDE/Events/ExpressionValidator.cpp

@@ -89,20 +89,43 @@ bool ExpressionValidator::ValidateObjectVariableOrVariableOrProperty(
   const auto& propertiesContainersList = projectScopedContainers.GetPropertiesContainersList();
   const auto& parametersVectorsList = projectScopedContainers.GetParametersVectorsList();
 
+  // Unless we find something precise (like a variable or property or parameter with a known type),
+  // we consider this node will be of the type required by the parent.
+  childType = parentType;
+
   return projectScopedContainers.MatchIdentifierWithName<bool>(identifier.identifierName,
     [&]() {
       // This represents an object.
       if (identifier.childIdentifierName.empty()) {
         RaiseTypeError(_("An object variable or expression should be entered."),
                         identifier.identifierNameLocation);
+
         return true; // We should have found a variable.
       }
 
-      if (!objectsContainersList.HasObjectOrGroupWithVariableNamed(identifier.identifierName, identifier.childIdentifierName)) {
+      auto variableExistence = objectsContainersList.HasObjectOrGroupWithVariableNamed(identifier.identifierName, identifier.childIdentifierName);
+
+      if (variableExistence == gd::ObjectsContainersList::DoesNotExist) {
         RaiseTypeError(_("This variable does not exist on this object or group."),
-                        identifier.identifierNameLocation);
+                        identifier.childIdentifierNameLocation);
+
         return true; // We should have found a variable.
       }
+      else if (variableExistence == gd::ObjectsContainersList::ExistsOnlyOnSomeObjectsOfTheGroup) {
+        RaiseTypeError(_("This variable only exists on some objects of the group. It must be declared for all objects."),
+                        identifier.childIdentifierNameLocation);
+
+        return true; // We should have found a variable.
+      }
+      else if (variableExistence == gd::ObjectsContainersList::GroupIsEmpty) {
+        RaiseTypeError(_("This group is empty. Add an object to this group first."),
+                        identifier.identifierNameLocation);
+
+        return true; // We should have found a variable.
+      }
+
+      auto variableType = objectsContainersList.GetTypeOfObjectOrGroupVariable(identifier.identifierName, identifier.childIdentifierName);
+      ReadChildTypeFromVariable(variableType);
 
       return true; // We found a variable.
     }, [&]() {
@@ -110,7 +133,6 @@ bool ExpressionValidator::ValidateObjectVariableOrVariableOrProperty(
 
       // Try to identify a declared variable with the name (and maybe the child
       // variable).
-
       const gd::Variable& variable =
           variablesContainersList.Get(identifier.identifierName);
 
@@ -118,6 +140,7 @@ bool ExpressionValidator::ValidateObjectVariableOrVariableOrProperty(
         // Just the root variable is accessed, check it can be used in an
         // expression.
         validateVariableTypeForExpression(variable.GetType());
+        ReadChildTypeFromVariable(variable.GetType());
 
         return true; // We found a variable.
       } else {
@@ -131,6 +154,7 @@ bool ExpressionValidator::ValidateObjectVariableOrVariableOrProperty(
 
         const gd::Variable& childVariable =
             variable.GetChild(identifier.childIdentifierName);
+        ReadChildTypeFromVariable(childVariable.GetType());
         return true; // We found a variable.
       }
     }, [&]() {
@@ -138,23 +162,44 @@ bool ExpressionValidator::ValidateObjectVariableOrVariableOrProperty(
       if (!identifier.childIdentifierName.empty()) {
         RaiseTypeError(_("Accessing a child variable of a property is not possible - just write the property name."),
             identifier.childIdentifierNameLocation);
+
         return true; // We found a property, even if the child is not allowed.
       }
 
+      const gd::NamedPropertyDescriptor& property = projectScopedContainers
+          .GetPropertiesContainersList().Get(identifier.identifierName).second;
+
+      if (property.GetType() == "Number") {
+       childType = Type::Number;
+      } else if (property.GetType() == "Boolean") {
+        // Nothing - we don't know the precise type (this could be used a string or as a number)
+      } else {
+        // Assume type is String or equivalent.
+        childType = Type::String;
+      }
+
       return true; // We found a property.
     }, [&]() {
       // This is a parameter.
       if (!identifier.childIdentifierName.empty()) {
         RaiseTypeError(_("Accessing a child variable of a parameter is not possible - just write the parameter name."),
             identifier.childIdentifierNameLocation);
+
         return true; // We found a parameter, even if the child is not allowed.
       }
 
       const auto& parameter = gd::ParameterMetadataTools::Get(parametersVectorsList, identifier.identifierName);
       const auto& valueTypeMetadata = parameter.GetValueTypeMetadata();
-      if (!valueTypeMetadata.IsNumber() && !valueTypeMetadata.IsString() && !valueTypeMetadata.IsBoolean()) {
+      if (valueTypeMetadata.IsNumber()) {
+        childType = Type::Number;
+      } else if (valueTypeMetadata.IsString()) {
+        childType = Type::String;
+      } else if (valueTypeMetadata.IsBoolean()) {
+        // Nothing - we don't know the precise type (this could be used as a string or as a number).
+      } else {
         RaiseTypeError(_("This parameter is not a string, number or boolean - it can't be used in an expression."),
             identifier.identifierNameLocation);
+
         return true; // We found a parameter, even though the type is incompatible.
       }
 
@@ -218,11 +263,17 @@ ExpressionValidator::Type ExpressionValidator::ValidateFunction(
   }
 
   if (gd::MetadataProvider::IsBadExpressionMetadata(metadata)) {
-    RaiseError("invalid_function_name",
+    if (function.functionName.empty()) {
+      RaiseError("invalid_function_name",
+               _("Enter the name of the function to call."),
+               function.location);
+    } else {
+      RaiseError("invalid_function_name",
                _("Cannot find an expression with this name: ") +
                    function.functionName + "\n" +
                    _("Double check that you've not made any typo in the name."),
                function.location);
+    }
     return returnType;
   }
 

Core/GDCore/IDE/Events/ExpressionValidator.h

@@ -103,9 +103,9 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
             "example: \"Your name: \" + VariableString(PlayerName).", node.rightHandSide->location);
       }
       else if (node.op != '+') {
-      RaiseOperatorError(
-          _("You've used an operator that is not supported. Only + can be used "
-            "to concatenate texts."),
+        RaiseOperatorError(
+            _("You've used an operator that is not supported. Only + can be used "
+              "to concatenate texts."),
             ExpressionParserLocation(node.leftHandSide->location.GetEndPosition() + 1, node.location.GetEndPosition()));
       }
     } else if (leftType == Type::Object) {
@@ -124,7 +124,11 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     node.rightHandSide->Visit(*this);
     const Type rightType = childType;
 
-    childType = leftType;
+    // The type is decided by the first operand, unless it can (`number|string`)
+    // or should (`unknown`) be refined, in which case we go for the right
+    // operand (which got visited knowing the type of the first operand, so it's
+    // equal or strictly more precise than the left operand).
+    childType = (leftType == Type::Unknown || leftType == Type::NumberOrString) ? leftType : rightType;
   }
   void OnVisitUnaryOperatorNode(UnaryOperatorNode& node) override {
     ReportAnyError(node);
@@ -309,8 +313,10 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
       RaiseTypeError(
           _("You've entered a name, but this type was expected:") + " " + TypeToString(parentType),
           node.location);
+      childType = parentType;
+    } else {
+      childType = parentType;
     }
-    childType = parentType;
   }
   void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode& node) override {
     ReportAnyError(node);
@@ -379,6 +385,16 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     RaiseError("invalid_operator", message, location);
   }
 
+  void ReadChildTypeFromVariable(gd::Variable::Type variableType) {
+    if (variableType == gd::Variable::Number) {
+      childType = Type::Number;
+    } else if (variableType == gd::Variable::String) {
+      childType = Type::String;
+    } else {
+      // Nothing - we don't know the precise type (this could be used as a string or as a number).
+    }
+  }
+
   static Type StringToType(const gd::String &type);
   static const gd::String &TypeToString(Type type);
   static const gd::String unknownTypeString;

Core/GDCore/IDE/Events/ExpressionVariableParentFinder.h

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

Core/GDCore/IDE/Events/UsedExtensionsFinder.cpp

@@ -25,6 +25,9 @@ const UsedExtensionsResult UsedExtensionsFinder::ScanProject(gd::Project& projec
 void UsedExtensionsFinder::DoVisitObject(gd::Object &object) {
   auto metadata = gd::MetadataProvider::GetExtensionAndObjectMetadata(
       project.GetCurrentPlatform(), object.GetType());
+  if (metadata.GetMetadata().IsRenderedIn3D()) {
+    result.MarkAsHaving3DObjects();
+  }
   result.GetUsedExtensions().insert(metadata.GetExtension().GetName());
   for (auto &&includeFile : metadata.GetMetadata().includeFiles) {
     result.GetUsedIncludeFiles().insert(includeFile);
@@ -110,7 +113,7 @@ void UsedExtensionsFinder::OnVisitVariableNode(VariableNode& node) {
   result.GetUsedExtensions().insert("BuiltinVariables");
 
   auto type = gd::ExpressionTypeFinder::GetType(
-      project.GetCurrentPlatform(), GetObjectsContainersList(), rootType, node);
+      project.GetCurrentPlatform(), GetProjectScopedContainers(), rootType, node);
 
   if (gd::ParameterMetadata::IsExpression("variable", type)) {
     // Nothing to do (this can't reference an object)
@@ -154,7 +157,7 @@ void UsedExtensionsFinder::OnVisitVariableBracketAccessorNode(
 // Add extensions bound to Objects/Behaviors/Functions
 void UsedExtensionsFinder::OnVisitIdentifierNode(IdentifierNode &node) {
   auto type = gd::ExpressionTypeFinder::GetType(
-      project.GetCurrentPlatform(), GetObjectsContainersList(), rootType, node);
+      project.GetCurrentPlatform(), GetProjectScopedContainers(), rootType, node);
   if (gd::ParameterMetadata::IsObject(type) ||
       GetObjectsContainersList().HasObjectOrGroupNamed(node.identifierName)) {
     // An object or object variable is used.

Core/GDCore/IDE/Events/UsedExtensionsFinder.h

@@ -44,6 +44,13 @@ public:
     return usedRequiredFiles;
   }
 
+  /**
+   * \brief Return true when at least 1 object uses the 3D renderer.
+   */
+  bool Has3DObjects() const {
+    return has3DObjects;
+  }
+
   /**
    * The extensions used by the project (or part of it).
    */
@@ -59,10 +66,15 @@ public:
    */
   std::set<gd::String> &GetUsedRequiredFiles() { return usedRequiredFiles; }
 
+  void MarkAsHaving3DObjects() {
+    has3DObjects = true;
+  }
+
 private:
   std::set<gd::String> usedExtensions;
   std::set<gd::String> usedIncludeFiles;
   std::set<gd::String> usedRequiredFiles;
+  bool has3DObjects = false;
 };
 
 class GD_CORE_API UsedExtensionsFinder

Core/GDCore/IDE/ExtensionsLoader.cpp

@@ -43,7 +43,6 @@ void ExtensionsLoader::LoadAllExtensions(const gd::String &directory,
   struct dirent *lecture;
   DIR *rep;
   rep = opendir(directory.c_str());
-  int l = 0;
 
   if (rep == NULL) {
     cout << "Unable to open Extensions (" << directory << ") directory."
@@ -63,8 +62,6 @@ void ExtensionsLoader::LoadAllExtensions(const gd::String &directory,
 
       LoadExtension(directory + "/" + lec, platform, forgiving);
       librariesLoaded.push_back(directory + "/" + lec);
-
-      l++;
     }
   }
 
@@ -103,7 +100,6 @@ void ExtensionsLoader::ExtensionsLoadingDone(const gd::String &directory) {
   struct dirent *lecture;
   DIR *rep;
   rep = opendir(directory.c_str());
-  int l = 0;
 
   if (rep == NULL) {
     cout << "Unable to open Extensions (" << directory << ") directory."
@@ -118,7 +114,6 @@ void ExtensionsLoader::ExtensionsLoadingDone(const gd::String &directory) {
         lec.find(".xgd" + suffix, lec.length() - 4 - suffix.length()) !=
             string::npos) {
       librariesLoaded.push_back(directory + "/" + lec);
-      l++;
     }
   }
 

Core/GDCore/IDE/ObjectAssetSerializer.cpp

@@ -0,0 +1,246 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2023 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "ObjectAssetSerializer.h"
+
+#include <algorithm>
+
+#include "GDCore/Extensions/Builtin/SpriteExtension/SpriteObject.h"
+#include "GDCore/Extensions/Metadata/BehaviorMetadata.h"
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+#include "GDCore/Extensions/Platform.h"
+#include "GDCore/Extensions/PlatformExtension.h"
+#include "GDCore/IDE/Project/AssetResourcePathCleaner.h"
+#include "GDCore/IDE/Project/ResourcesInUseHelper.h"
+#include "GDCore/IDE/Project/ResourcesRenamer.h"
+#include "GDCore/Project/Behavior.h"
+#include "GDCore/Project/CustomBehavior.h"
+#include "GDCore/Project/EventsFunctionsExtension.h"
+#include "GDCore/Project/Layout.h"
+#include "GDCore/Project/Object.h"
+#include "GDCore/Project/Project.h"
+#include "GDCore/Project/PropertyDescriptor.h"
+#include "GDCore/Serialization/SerializerElement.h"
+#include "GDCore/Tools/Log.h"
+
+namespace gd {
+
+gd::String
+ObjectAssetSerializer::GetObjectExtensionName(const gd::Object &object) {
+  const gd::String &type = object.GetType();
+  const auto separatorIndex =
+      type.find(PlatformExtension::GetNamespaceSeparator());
+  return separatorIndex != std::string::npos ? type.substr(0, separatorIndex)
+                                             : "";
+}
+
+void ObjectAssetSerializer::SerializeTo(
+    gd::Project &project, const gd::Object &object,
+    const gd::String &objectFullName, SerializerElement &element,
+    std::map<gd::String, std::vector<gd::String>> &resourcesFileNameMap) {
+  auto cleanObject = object.Clone();
+  cleanObject->GetVariables().Clear();
+  cleanObject->GetEffects().Clear();
+  for (auto &&behaviorName : cleanObject->GetAllBehaviorNames()) {
+    cleanObject->RemoveBehavior(behaviorName);
+  }
+
+  gd::String extensionName = GetObjectExtensionName(*cleanObject);
+
+  std::map<gd::String, gd::String> resourcesNameReverseMap;
+  gd::ObjectAssetSerializer::RenameObjectResourceFiles(
+      project, *cleanObject, "", objectFullName, resourcesFileNameMap,
+      resourcesNameReverseMap);
+
+  element.SetAttribute("id", "");
+  element.SetAttribute("name", "");
+  element.SetAttribute("license", "");
+  if (project.HasEventsFunctionsExtensionNamed(extensionName)) {
+    auto &extension = project.GetEventsFunctionsExtension(extensionName);
+    element.SetAttribute("description", extension.GetShortDescription());
+  }
+  element.SetAttribute("gdevelopVersion", "");
+  element.SetAttribute("version", "");
+  element.SetIntAttribute("animationsCount", 1);
+  element.SetIntAttribute("maxFramesCount", 1);
+  // TODO Find the right object dimensions.
+  element.SetIntAttribute("width", 0);
+  element.SetIntAttribute("height", 0);
+  SerializerElement &authorsElement = element.AddChild("authors");
+  authorsElement.ConsiderAsArrayOf("author");
+  SerializerElement &tagsElement = element.AddChild("tags");
+  tagsElement.ConsiderAsArrayOf("tag");
+
+  SerializerElement &objectAssetsElement = element.AddChild("objectAssets");
+  objectAssetsElement.ConsiderAsArrayOf("objectAsset");
+  SerializerElement &objectAssetElement =
+      objectAssetsElement.AddChild("objectAsset");
+
+  cleanObject->SerializeTo(objectAssetElement.AddChild("object"));
+
+  SerializerElement &resourcesElement =
+      objectAssetElement.AddChild("resources");
+  resourcesElement.ConsiderAsArrayOf("resource");
+  auto &resourcesManager = project.GetResourcesManager();
+  gd::ResourcesInUseHelper resourcesInUse(resourcesManager);
+  cleanObject->GetConfiguration().ExposeResources(resourcesInUse);
+  for (auto &&newResourceName : resourcesInUse.GetAllResources()) {
+    if (newResourceName.length() == 0) {
+      continue;
+    }
+    auto &resource = resourcesManager.GetResource(
+        resourcesNameReverseMap.find(newResourceName) !=
+                resourcesNameReverseMap.end()
+            ? resourcesNameReverseMap[newResourceName]
+            : newResourceName);
+    SerializerElement &resourceElement = resourcesElement.AddChild("resource");
+    resource.SerializeTo(resourceElement);
+    // Override name and file because the project and the asset don't use the
+    // same one.
+    resourceElement.SetAttribute("kind", resource.GetKind());
+    resourceElement.SetAttribute("name", newResourceName);
+    auto &oldFilePath = resource.GetFile();
+    resourceElement.SetAttribute("file", newResourceName);
+  }
+
+  SerializerElement &requiredExtensionsElement =
+      objectAssetElement.AddChild("requiredExtensions");
+  requiredExtensionsElement.ConsiderAsArrayOf("requiredExtension");
+  if (project.HasEventsFunctionsExtensionNamed(extensionName)) {
+    SerializerElement &requiredExtensionElement =
+        requiredExtensionsElement.AddChild("requiredExtension");
+    requiredExtensionElement.SetAttribute("extensionName", extensionName);
+    requiredExtensionElement.SetAttribute("extensionVersion", "1.0.0");
+  }
+
+  // TODO This can be removed when the asset script no longer require it.
+  SerializerElement &customizationElement =
+      objectAssetElement.AddChild("customization");
+  customizationElement.ConsiderAsArrayOf("empty");
+}
+
+void ObjectAssetSerializer::RenameObjectResourceFiles(
+    gd::Project &project, gd::Object &object,
+    const gd::String &destinationDirectory, const gd::String &objectFullName,
+    std::map<gd::String, std::vector<gd::String>> &resourcesFileNameMap,
+    std::map<gd::String, gd::String> &resourcesNameReverseMap) {
+  std::map<gd::String, gd::String> cleanedResourcesFileNameMap;
+  gd::AssetResourcePathCleaner assetResourcePathCleaner(
+      project.GetResourcesManager(), cleanedResourcesFileNameMap,
+      resourcesNameReverseMap);
+  object.GetConfiguration().ExposeResources(assetResourcePathCleaner);
+
+  // Use asset store script naming conventions for sprite resource files.
+  if (object.GetConfiguration().GetType() == "Sprite") {
+    gd::SpriteObject &spriteConfiguration =
+        dynamic_cast<gd::SpriteObject &>(object.GetConfiguration());
+    /// Resource files may be duplicated because the files names allow the
+    /// asset store script to rebuild the animations.
+    std::map<gd::String, std::vector<gd::String>> normalizedFileNames;
+
+    for (std::size_t animationIndex = 0;
+         animationIndex < spriteConfiguration.GetAnimationsCount();
+         animationIndex++) {
+      auto &animation = spriteConfiguration.GetAnimation(animationIndex);
+      auto &direction = animation.GetDirection(0);
+
+      const gd::String &animationName =
+          animation.GetName().empty()
+              ? gd::String::From(animationIndex)
+              : animation.GetName().FindAndReplace("_", " ", true);
+
+      // Search frames that share the same resource.
+      std::map<gd::String, std::vector<int>> frameIndexes;
+      for (std::size_t frameIndex = 0; frameIndex < direction.GetSpritesCount();
+           frameIndex++) {
+        auto &frame = direction.GetSprite(frameIndex);
+
+        if (frameIndexes.find(frame.GetImageName()) == frameIndexes.end()) {
+          std::vector<int> emptyVector;
+          frameIndexes[frame.GetImageName()] = emptyVector;
+        }
+        auto &indexes = frameIndexes[frame.GetImageName()];
+        indexes.push_back(frameIndex);
+      }
+
+      for (std::size_t frameIndex = 0; frameIndex < direction.GetSpritesCount();
+           frameIndex++) {
+        auto &frame = direction.GetSprite(frameIndex);
+        auto oldName = frame.GetImageName();
+
+        if (normalizedFileNames.find(oldName) == normalizedFileNames.end()) {
+          std::vector<gd::String> value;
+          normalizedFileNames[oldName] = value;
+        }
+
+        gd::String newName = objectFullName;
+        if (spriteConfiguration.GetAnimationsCount() > 1) {
+          newName += "_" + animationName;
+        }
+        if (direction.GetSpritesCount() > 1) {
+          newName += "_";
+          auto &indexes = frameIndexes[frame.GetImageName()];
+          for (size_t i = 0; i < indexes.size(); i++) {
+            newName += gd::String::From(indexes.at(i) + 1);
+            if (i < indexes.size() - 1) {
+              newName += ";";
+            }
+          }
+        }
+        gd::String extension = oldName.substr(oldName.find_last_of("."));
+        newName += extension;
+
+        frame.SetImageName(newName);
+        auto &newNames = normalizedFileNames[oldName];
+        if (find(newNames.begin(), newNames.end(), newName) == newNames.end()) {
+          newNames.push_back(newName);
+        }
+      }
+    }
+    for (std::map<gd::String, gd::String>::const_iterator it =
+             cleanedResourcesFileNameMap.begin();
+         it != cleanedResourcesFileNameMap.end(); ++it) {
+      if (!it->first.empty()) {
+        const gd::String &originFile = it->first;
+        const gd::String &destinationFile = it->second;
+
+        std::vector<gd::String> value;
+        for (auto &&normalizedFileName : normalizedFileNames[destinationFile]) {
+          value.push_back(normalizedFileName);
+        }
+        resourcesFileNameMap[originFile] = value;
+      }
+    }
+    auto clonedResourcesNameReverseMap = resourcesNameReverseMap;
+    resourcesNameReverseMap.clear();
+    for (std::map<gd::String, gd::String>::const_iterator it =
+             clonedResourcesNameReverseMap.begin();
+         it != clonedResourcesNameReverseMap.end(); ++it) {
+      if (!it->first.empty()) {
+        const gd::String& newResourceName = it->first;
+        const gd::String& oldResourceName = it->second;
+        for (auto&& normalizedFileName : normalizedFileNames[newResourceName]) {
+          resourcesNameReverseMap[normalizedFileName] =
+              oldResourceName;
+        }
+      }
+    }
+  }
+  else {
+    for (std::map<gd::String, gd::String>::const_iterator it =
+             cleanedResourcesFileNameMap.begin();
+         it != cleanedResourcesFileNameMap.end(); ++it) {
+      if (!it->first.empty()) {
+        const gd::String &originFile = it->first;
+        const gd::String &destinationFile = it->second;
+
+        std::vector<gd::String> value;
+        value.push_back(destinationFile);
+        resourcesFileNameMap[originFile] = value;
+      }
+    }
+  }
+}
+} // namespace gd

Core/GDCore/IDE/ObjectAssetSerializer.h

@@ -0,0 +1,66 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2023 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#pragma once
+#include <map>
+#include <vector>
+
+#include "GDCore/String.h"
+
+namespace gd {
+class Object;
+class ExtensionDependency;
+class PropertyDescriptor;
+class Project;
+class Layout;
+class ArbitraryResourceWorker;
+class InitialInstance;
+class SerializerElement;
+class EffectsContainer;
+class AbstractFileSystem;
+} // namespace gd
+
+namespace gd {
+
+/**
+ * \brief Serialize objects into an asset for the store.
+ *
+ * \ingroup IDE
+ */
+class GD_CORE_API ObjectAssetSerializer {
+public:
+  /**
+   * \brief Serialize an object into an asset.
+   *
+   * \param project The project that contains the object and its resources.
+   * It's not actually modified.
+   * \param object The object to serialize as an asset.
+   * \param objectFullName The object name with spaces instead of PascalCase.
+   * \param element The element where the asset is serialize.
+   * \param resourcesFileNameMap The map from project resource file paths to
+   * asset resource file paths. Resource files of Sprite objects may be
+   * duplicated because the files names allow the asset store script to rebuild
+   * the animations.
+   */
+  static void
+  SerializeTo(gd::Project &project, const gd::Object &object,
+              const gd::String &objectFullName, SerializerElement &element,
+              std::map<gd::String, std::vector<gd::String>> &resourcesFileNameMap);
+
+  ~ObjectAssetSerializer(){};
+
+private:
+  ObjectAssetSerializer(){};
+
+  static void RenameObjectResourceFiles(
+      gd::Project &project, gd::Object &object,
+      const gd::String &destinationDirectory, const gd::String &objectFullName,
+      std::map<gd::String, std::vector<gd::String>> &resourcesFileNameMap,
+      std::map<gd::String, gd::String> &resourcesNameReverseMap);
+
+  static gd::String GetObjectExtensionName(const gd::Object &object);
+};
+
+} // namespace gd

Core/GDCore/IDE/Project/ArbitraryResourceWorker.cpp

@@ -52,6 +52,16 @@ void ArbitraryResourceWorker::ExposeModel3D(gd::String& resourceName){
     // do.
 };
 
+void ArbitraryResourceWorker::ExposeAtlas(gd::String& resourceName){
+    // Nothing to do by default - each child class can define here the action to
+    // do.
+};
+
+void ArbitraryResourceWorker::ExposeSpine(gd::String& resourceName){
+    // Nothing to do by default - each child class can define here the action to
+    // do.
+};
+
 void ArbitraryResourceWorker::ExposeVideo(gd::String& videoName){
     // Nothing to do by default - each child class can define here the action to
     // do.
@@ -63,14 +73,10 @@ void ArbitraryResourceWorker::ExposeBitmapFont(gd::String& bitmapFontName){
 };
 
 void ArbitraryResourceWorker::ExposeAudio(gd::String& audioName) {
-  for (auto resources : GetResources()) {
-    if (!resources) continue;
-
-    if (resources->HasResource(audioName) &&
-        resources->GetResource(audioName).GetKind() == "audio") {
-      // Nothing to do, the audio is a reference to a proper resource.
-      return;
-    }
+  if (resourcesManager->HasResource(audioName) &&
+      resourcesManager->GetResource(audioName).GetKind() == "audio") {
+    // Nothing to do, the audio is a reference to a proper resource.
+    return;
   }
 
   // For compatibility with older projects (where events were referring to files
@@ -80,14 +86,10 @@ void ArbitraryResourceWorker::ExposeAudio(gd::String& audioName) {
 };
 
 void ArbitraryResourceWorker::ExposeFont(gd::String& fontName) {
-  for (auto resources : GetResources()) {
-    if (!resources) continue;
-
-    if (resources->HasResource(fontName) &&
-        resources->GetResource(fontName).GetKind() == "font") {
-      // Nothing to do, the font is a reference to a proper resource.
-      return;
-    }
+  if (resourcesManager->HasResource(fontName) &&
+      resourcesManager->GetResource(fontName).GetKind() == "font") {
+    // Nothing to do, the font is a reference to a proper resource.
+    return;
   }
 
   // For compatibility with older projects (where events were referring to files
@@ -96,12 +98,7 @@ void ArbitraryResourceWorker::ExposeFont(gd::String& fontName) {
   ExposeFile(fontName);
 };
 
-void ArbitraryResourceWorker::ExposeResources(
-    gd::ResourcesManager* resourcesManager) {
-  if (!resourcesManager) return;
-
-  resourcesManagers.push_back(resourcesManager);
-
+void ArbitraryResourceWorker::ExposeResources() {
   std::vector<gd::String> resources = resourcesManager->GetAllResourceNames();
   for (std::size_t i = 0; i < resources.size(); i++) {
     if (resourcesManager->GetResource(resources[i]).UseFile())
@@ -110,9 +107,6 @@ void ArbitraryResourceWorker::ExposeResources(
 }
 
 void ArbitraryResourceWorker::ExposeEmbeddeds(gd::String& resourceName) {
-  if (resourcesManagers.empty()) return;
-  gd::ResourcesManager* resourcesManager = resourcesManagers[0];
-
   gd::Resource& resource = resourcesManager->GetResource(resourceName);
 
   if (!resource.GetMetadata().empty()) {
@@ -136,6 +130,7 @@ void ArbitraryResourceWorker::ExposeEmbeddeds(gd::String& resourceName) {
 
           gd::String potentiallyUpdatedTargetResourceName = targetResourceName;
           ExposeResourceWithType(targetResource.GetKind(), potentiallyUpdatedTargetResourceName);
+          ExposeEmbeddeds(potentiallyUpdatedTargetResourceName);
 
           if (potentiallyUpdatedTargetResourceName != targetResourceName) {
             // The resource name was renamed. Also update the mapping.
@@ -176,6 +171,7 @@ void ArbitraryResourceWorker::ExposeResourceWithType(
   }
   if (resourceType == "tilemap") {
     ExposeTilemap(resourceName);
+    ExposeEmbeddeds(resourceName);
     return;
   }
   if (resourceType == "tileset") {
@@ -184,12 +180,21 @@ void ArbitraryResourceWorker::ExposeResourceWithType(
   }
   if (resourceType == "json") {
     ExposeJson(resourceName);
+    ExposeEmbeddeds(resourceName);
     return;
   }
   if (resourceType == "video") {
     ExposeVideo(resourceName);
     return;
   }
+  if (resourceType == "atlas") {
+    ExposeAtlas(resourceName);
+    return;
+  }
+  if (resourceType == "spine") {
+    ExposeSpine(resourceName);
+    return;
+  }
   gd::LogError("Unexpected resource type: " + resourceType + " for: " + resourceName);
   return;
 }
@@ -243,10 +248,12 @@ bool ResourceWorkerInEventsWorker::DoVisitInstruction(gd::Instruction& instructi
         } else if (parameterMetadata.GetType() == "jsonResource") {
           gd::String updatedParameterValue = parameterValue;
           worker.ExposeJson(updatedParameterValue);
+          worker.ExposeEmbeddeds(updatedParameterValue);
           instruction.SetParameter(parameterIndex, updatedParameterValue);
         } else if (parameterMetadata.GetType() == "tilemapResource") {
           gd::String updatedParameterValue = parameterValue;
           worker.ExposeTilemap(updatedParameterValue);
+          worker.ExposeEmbeddeds(updatedParameterValue);
           instruction.SetParameter(parameterIndex, updatedParameterValue);
         } else if (parameterMetadata.GetType() == "tilesetResource") {
           gd::String updatedParameterValue = parameterValue;
@@ -256,19 +263,20 @@ bool ResourceWorkerInEventsWorker::DoVisitInstruction(gd::Instruction& instructi
           gd::String updatedParameterValue = parameterValue;
           worker.ExposeModel3D(updatedParameterValue);
           instruction.SetParameter(parameterIndex, updatedParameterValue);
+        } else if (parameterMetadata.GetType() == "atlasResource") {
+          gd::String updatedParameterValue = parameterValue;
+          worker.ExposeAtlas(updatedParameterValue);
+          instruction.SetParameter(parameterIndex, updatedParameterValue);
+        } else if (parameterMetadata.GetType() == "spineResource") {
+          gd::String updatedParameterValue = parameterValue;
+          worker.ExposeSpine(updatedParameterValue);
+          instruction.SetParameter(parameterIndex, updatedParameterValue);
         }
       });
 
   return false;
 };
 
-void LaunchResourceWorkerOnEvents(const gd::Project& project,
-                                  gd::EventsList& events,
-                                  gd::ArbitraryResourceWorker& worker) {
-  gd::ResourceWorkerInEventsWorker eventsWorker(project, worker);
-  eventsWorker.Launch(events);
-}
-
 gd::ResourceWorkerInEventsWorker
 GetResourceWorkerOnEvents(const gd::Project &project,
                           gd::ArbitraryResourceWorker &worker) {
@@ -293,8 +301,8 @@ void ResourceWorkerInObjectsWorker::DoVisitBehavior(gd::Behavior &behavior){
 gd::ResourceWorkerInObjectsWorker
 GetResourceWorkerOnObjects(const gd::Project &project,
                            gd::ArbitraryResourceWorker &worker) {
-  gd::ResourceWorkerInObjectsWorker eventsWorker(project, worker);
-  return eventsWorker;
+  gd::ResourceWorkerInObjectsWorker resourcesWorker(project, worker);
+  return resourcesWorker;
 }
 
 }  // namespace gd

Core/GDCore/IDE/Project/ArbitraryResourceWorker.h

@@ -37,13 +37,14 @@ namespace gd {
  * \see ResourcesMergingHelper
  * \see gd::ResourcesInUseHelper
  *
- * \see gd::LaunchResourceWorkerOnEvents
+ * \see gd::GetResourceWorkerOnEvents
  *
  * \ingroup IDE
  */
 class GD_CORE_API ArbitraryResourceWorker {
- public:
-  ArbitraryResourceWorker(){};
+public:
+  ArbitraryResourceWorker(gd::ResourcesManager &resourcesManager_)
+      : resourcesManager(&resourcesManager_){};
   virtual ~ArbitraryResourceWorker();
 
   /**
@@ -52,7 +53,7 @@ class GD_CORE_API ArbitraryResourceWorker {
    * first to ensure that resources are known so that images, shaders & audio
    * can make reference to them.
    */
-  void ExposeResources(gd::ResourcesManager *resourcesManager);
+  void ExposeResources();
 
   /**
    * \brief Expose a resource from a given type.
@@ -95,6 +96,16 @@ class GD_CORE_API ArbitraryResourceWorker {
    * \brief Expose a 3D model, which is always a reference to a "model3D" resource.
    */
   virtual void ExposeModel3D(gd::String &resourceName);
+  
+  /**
+   * \brief Expose an atlas, which is always a reference to a "atlas" resource.
+   */
+  virtual void ExposeAtlas(gd::String &resourceName);
+
+  /**
+   * \brief Expose an spine, which is always a reference to a "spine" resource.
+   */
+  virtual void ExposeSpine(gd::String &resourceName);
 
   /**
    * \brief Expose a video, which is always a reference to a "video" resource.
@@ -122,10 +133,8 @@ class GD_CORE_API ArbitraryResourceWorker {
    */
   virtual void ExposeEmbeddeds(gd::String &resourceName);
 
- protected:
-  const std::vector<gd::ResourcesManager *> &GetResources() {
-    return resourcesManagers;
-  };
+protected:
+  gd::ResourcesManager * resourcesManager;
 
  private:
   /**
@@ -133,8 +142,6 @@ class GD_CORE_API ArbitraryResourceWorker {
    * exposed as file (see ExposeFile).
    */
   void ExposeResource(gd::Resource &resource);
-
-  std::vector<gd::ResourcesManager *> resourcesManagers;
 };
 
 /**

Core/GDCore/IDE/Project/AssetResourcePathCleaner.cpp

@@ -0,0 +1,74 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2023 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+
+#include "AssetResourcePathCleaner.h"
+#include "GDCore/Project/Project.h"
+#include "GDCore/Project/ResourcesManager.h"
+#include "GDCore/String.h"
+
+namespace gd {
+void AssetResourcePathCleaner::ExposeImage(gd::String &imageName) {
+  ExposeResourceAsFile(imageName);
+}
+
+void AssetResourcePathCleaner::ExposeAudio(gd::String &audioName) {
+  ExposeResourceAsFile(audioName);
+}
+
+void AssetResourcePathCleaner::ExposeFont(gd::String &fontName) {
+  ExposeResourceAsFile(fontName);
+}
+
+void AssetResourcePathCleaner::ExposeJson(gd::String &jsonName) {
+  ExposeResourceAsFile(jsonName);
+}
+
+void AssetResourcePathCleaner::ExposeTilemap(gd::String &tilemapName) {
+  ExposeResourceAsFile(tilemapName);
+}
+
+void AssetResourcePathCleaner::ExposeTileset(gd::String &tilesetName) {
+  ExposeResourceAsFile(tilesetName);
+}
+
+void AssetResourcePathCleaner::ExposeVideo(gd::String &videoName) {
+  ExposeResourceAsFile(videoName);
+}
+
+void AssetResourcePathCleaner::ExposeBitmapFont(gd::String &bitmapFontName) {
+  ExposeResourceAsFile(bitmapFontName);
+}
+
+void AssetResourcePathCleaner::ExposeResourceAsFile(gd::String &resourceName) {
+
+  auto &resource = resourcesManager->GetResource(resourceName);
+  gd::String file = resource.GetFile();
+  ExposeFile(file);
+
+  resourcesNameReverseMap[file] = resourceName;
+  resourceName = file;
+}
+
+void AssetResourcePathCleaner::ExposeFile(gd::String &resourceFilePath) {
+
+  size_t slashPos = resourceFilePath.find_last_of("/");
+  size_t antiSlashPos = resourceFilePath.find_last_of("\\");
+  size_t baseNamePos =
+      slashPos == String::npos
+          ? antiSlashPos == String::npos ? 0 : (antiSlashPos + 1)
+      : antiSlashPos == String::npos ? (slashPos + 1)
+      : slashPos > antiSlashPos      ? (slashPos + 1)
+                                     : (antiSlashPos + 1);
+  gd::String baseName =
+      baseNamePos != 0
+          ? resourceFilePath.substr(baseNamePos, resourceFilePath.length())
+          : resourceFilePath;
+
+  resourcesFileNameMap[resourceFilePath] = baseName;
+  resourceFilePath = baseName;
+}
+
+} // namespace gd

Core/GDCore/IDE/Project/AssetResourcePathCleaner.h

@@ -0,0 +1,65 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2023 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#pragma once
+
+#include "GDCore/IDE/Project/ArbitraryResourceWorker.h"
+#include "GDCore/IDE/Project/ResourcesMergingHelper.h"
+#include "GDCore/String.h"
+#include <map>
+#include <memory>
+#include <vector>
+
+namespace gd {
+class AbstractFileSystem;
+class Project;
+} // namespace gd
+
+namespace gd {
+
+/**
+ * \brief AssetResourcePathCleaner is used when exporting an object as an asset.
+ * It removes the folder from the path.
+ *
+ * \see ArbitraryResourceWorker
+ *
+ * \ingroup IDE
+ */
+class GD_CORE_API AssetResourcePathCleaner : public ArbitraryResourceWorker {
+public:
+  AssetResourcePathCleaner(
+      gd::ResourcesManager &resourcesManager,
+      std::map<gd::String, gd::String> &resourcesFileNameMap_,
+      std::map<gd::String, gd::String> &resourcesNameReverseMap_)
+      : ArbitraryResourceWorker(resourcesManager),
+        resourcesFileNameMap(resourcesFileNameMap_),
+        resourcesNameReverseMap(resourcesNameReverseMap_){};
+  virtual ~AssetResourcePathCleaner(){};
+
+  void ExposeImage(gd::String &imageName) override;
+  void ExposeAudio(gd::String &audioName) override;
+  void ExposeFont(gd::String &fontName) override;
+  void ExposeJson(gd::String &jsonName) override;
+  void ExposeTilemap(gd::String &tilemapName) override;
+  void ExposeTileset(gd::String &tilesetName) override;
+  void ExposeVideo(gd::String &videoName) override;
+  void ExposeBitmapFont(gd::String &bitmapFontName) override;
+  void ExposeFile(gd::String &resource) override;
+
+protected:
+  void ExposeResourceAsFile(gd::String &resourceName);
+
+  /**
+   * New file names that can be accessed by their original name.
+   */
+  std::map<gd::String, gd::String> &resourcesFileNameMap;
+
+  /**
+   * Original resource names that can be accessed by their new name.
+   */
+  std::map<gd::String, gd::String> &resourcesNameReverseMap;
+};
+
+} // namespace gd

Core/GDCore/IDE/Project/ObjectsUsingResourceCollector.cpp

@@ -0,0 +1,19 @@
+#include "ObjectsUsingResourceCollector.h"
+
+#include "GDCore/Project/Object.h"
+#include "GDCore/Project/Project.h"
+
+namespace gd {
+
+void ObjectsUsingResourceCollector::DoVisitObject(gd::Object& object) {
+  gd::ResourceNameMatcher resourceNameMatcher(*resourcesManager, resourceName);
+
+  object.GetConfiguration().ExposeResources(resourceNameMatcher);
+  if (resourceNameMatcher.AnyResourceMatches()) {
+    objectNames.push_back(object.GetName());
+  }
+};
+
+ObjectsUsingResourceCollector::~ObjectsUsingResourceCollector() {}
+
+}  // namespace gd

Core/GDCore/IDE/Project/ObjectsUsingResourceCollector.h

@@ -0,0 +1,97 @@
+/*
+ * 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 <vector>
+
+#include "GDCore/IDE/Project/ArbitraryObjectsWorker.h"
+#include "GDCore/IDE/Project/ArbitraryResourceWorker.h"
+#include "GDCore/String.h"
+
+namespace gd {
+class Object;
+}  // namespace gd
+
+namespace gd {
+
+class GD_CORE_API ObjectsUsingResourceCollector
+    : public ArbitraryObjectsWorker {
+public:
+  ObjectsUsingResourceCollector(gd::ResourcesManager &resourcesManager_,
+                                const gd::String &resourceName_)
+      : resourcesManager(&resourcesManager_), resourceName(resourceName_){};
+  virtual ~ObjectsUsingResourceCollector();
+
+  std::vector<gd::String>& GetObjectNames() { return objectNames; }
+
+ private:
+  void DoVisitObject(gd::Object& object) override;
+
+  std::vector<gd::String> objectNames;
+  gd::String resourceName;
+  gd::ResourcesManager *resourcesManager;
+};
+
+class GD_CORE_API ResourceNameMatcher : public ArbitraryResourceWorker {
+public:
+  ResourceNameMatcher(gd::ResourcesManager &resourcesManager,
+                      const gd::String &resourceName_)
+      : resourceName(resourceName_),
+        matchesResourceName(false), gd::ArbitraryResourceWorker(
+                                        resourcesManager){};
+  virtual ~ResourceNameMatcher(){};
+
+  bool AnyResourceMatches() { return matchesResourceName; }
+  void Reset() { matchesResourceName = false; }
+
+ private:
+  virtual void ExposeFile(gd::String& resource) override{
+      /*Don't care, we just read resource names*/
+  };
+  virtual void ExposeImage(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+  virtual void ExposeAudio(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+  virtual void ExposeFont(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+  virtual void ExposeJson(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+  virtual void ExposeTilemap(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+  virtual void ExposeTileset(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+  virtual void ExposeVideo(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+  virtual void ExposeBitmapFont(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+  virtual void ExposeModel3D(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+  virtual void ExposeAtlas(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+  virtual void ExposeSpine(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
+
+  void MatchResourceName(gd::String& otherResourceName) {
+    if (otherResourceName == resourceName) matchesResourceName = true;
+  }
+
+  gd::String resourceName;
+  bool matchesResourceName;
+};
+
+};  // namespace gd

Core/GDCore/IDE/Project/ProjectResourcesAdder.cpp

@@ -18,8 +18,9 @@ namespace gd {
 std::vector<gd::String> ProjectResourcesAdder::GetAllUseless(
     gd::Project& project, const gd::String& resourceType) {
   std::vector<gd::String> unusedResources;
+
   // Search for resources used in the project
-  gd::ResourcesInUseHelper resourcesInUse;
+  gd::ResourcesInUseHelper resourcesInUse(project.GetResourcesManager());
   gd::ResourceExposer::ExposeWholeProjectResources(project, resourcesInUse);
   std::set<gd::String>& usedResources = resourcesInUse.GetAll(resourceType);
 

Core/GDCore/IDE/Project/ProjectResourcesCopier.cpp

@@ -25,8 +25,29 @@ bool ProjectResourcesCopier::CopyAllResourcesTo(
     bool updateOriginalProject,
     bool preserveAbsoluteFilenames,
     bool preserveDirectoryStructure) {
+  if (updateOriginalProject) {
+    gd::ProjectResourcesCopier::CopyAllResourcesTo(
+        originalProject, originalProject, fs, destinationDirectory,
+        preserveAbsoluteFilenames, preserveDirectoryStructure);
+  } else {
+    gd::Project clonedProject = originalProject;
+    gd::ProjectResourcesCopier::CopyAllResourcesTo(
+        originalProject, clonedProject, fs, destinationDirectory,
+        preserveAbsoluteFilenames, preserveDirectoryStructure);
+  }
+  return true;
+}
+
+bool ProjectResourcesCopier::CopyAllResourcesTo(
+    gd::Project& originalProject,
+    gd::Project& clonedProject,
+    AbstractFileSystem& fs,
+    gd::String destinationDirectory,
+    bool preserveAbsoluteFilenames,
+    bool preserveDirectoryStructure) {
+
   // Check if there are some resources with absolute filenames
-  gd::ResourcesAbsolutePathChecker absolutePathChecker(fs);
+  gd::ResourcesAbsolutePathChecker absolutePathChecker(originalProject.GetResourcesManager(), fs);
   gd::ResourceExposer::ExposeWholeProjectResources(originalProject, absolutePathChecker);
 
   auto projectDirectory = fs.DirNameFrom(originalProject.GetProjectFile());
@@ -34,24 +55,18 @@ bool ProjectResourcesCopier::CopyAllResourcesTo(
             << destinationDirectory << "..." << std::endl;
 
   // Get the resources to be copied
-  gd::ResourcesMergingHelper resourcesMergingHelper(fs);
+  gd::ResourcesMergingHelper resourcesMergingHelper(
+      clonedProject.GetResourcesManager(), fs);
   resourcesMergingHelper.SetBaseDirectory(projectDirectory);
   resourcesMergingHelper.PreserveDirectoriesStructure(
       preserveDirectoryStructure);
-  resourcesMergingHelper.PreserveAbsoluteFilenames(
-      preserveAbsoluteFilenames);
-
-  if (updateOriginalProject) {
-    gd::ResourceExposer::ExposeWholeProjectResources(originalProject, resourcesMergingHelper);
-  } else {
-    std::shared_ptr<gd::Project> project(new gd::Project(originalProject));
-    gd::ResourceExposer::ExposeWholeProjectResources(*project, resourcesMergingHelper);
-  }
+  resourcesMergingHelper.PreserveAbsoluteFilenames(preserveAbsoluteFilenames);
+  gd::ResourceExposer::ExposeWholeProjectResources(clonedProject,
+                                                    resourcesMergingHelper);
 
   // Copy resources
   map<gd::String, gd::String>& resourcesNewFilename =
       resourcesMergingHelper.GetAllResourcesOldAndNewFilename();
-  unsigned int i = 0;
   for (map<gd::String, gd::String>::const_iterator it =
            resourcesNewFilename.begin();
        it != resourcesNewFilename.end();
@@ -71,8 +86,6 @@ bool ProjectResourcesCopier::CopyAllResourcesTo(
                        destinationFile + _("\"."));
       }
     }
-
-    ++i;
   }
 
   return true;

Core/GDCore/IDE/Project/ProjectResourcesCopier.h

@@ -3,9 +3,10 @@
  * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef PROJECTRESOURCESCOPIER_H
-#define PROJECTRESOURCESCOPIER_H
+#pragma once
+
 #include "GDCore/String.h"
+
 namespace gd {
 class Project;
 class AbstractFileSystem;
@@ -47,8 +48,14 @@ class GD_CORE_API ProjectResourcesCopier {
                                  bool updateOriginalProject,
                                  bool preserveAbsoluteFilenames = true,
                                  bool preserveDirectoryStructure = true);
+
+private:
+  static bool CopyAllResourcesTo(gd::Project& originalProject,
+                                 gd::Project& clonedProject,
+                                 gd::AbstractFileSystem& fs,
+                                 gd::String destinationDirectory,
+                                 bool preserveAbsoluteFilenames = true,
+                                 bool preserveDirectoryStructure = true);
 };
 
 }  // namespace gd
-
-#endif  // PROJECTRESOURCESCOPIER_H

Core/GDCore/IDE/Project/ResourcesAbsolutePathChecker.h

@@ -3,8 +3,7 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef RESOURCESABSOLUTEPATHCHECKER_H
-#define RESOURCESABSOLUTEPATHCHECKER_H
+#pragma once
 
 #include "GDCore/IDE/AbstractFileSystem.h"
 #include "GDCore/IDE/Project/ArbitraryResourceWorker.h"
@@ -22,10 +21,10 @@ namespace gd {
  */
 class GD_CORE_API ResourcesAbsolutePathChecker
     : public ArbitraryResourceWorker {
- public:
-  ResourcesAbsolutePathChecker(AbstractFileSystem& fileSystem)
-      : ArbitraryResourceWorker(),
-        hasAbsoluteFilenames(false),
+public:
+  ResourcesAbsolutePathChecker(gd::ResourcesManager &resourcesManager,
+                               AbstractFileSystem &fileSystem)
+      : ArbitraryResourceWorker(resourcesManager), hasAbsoluteFilenames(false),
         fs(fileSystem){};
   virtual ~ResourcesAbsolutePathChecker(){};
 
@@ -47,5 +46,3 @@ class GD_CORE_API ResourcesAbsolutePathChecker
 };
 
 }  // namespace gd
-
-#endif  // RESOURCESABSOLUTEPATHCHECKER_H

Core/GDCore/IDE/Project/ResourcesInUseHelper.cpp

@@ -0,0 +1,25 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+
+#include "ResourcesInUseHelper.h"
+
+namespace gd {
+
+const std::vector<gd::String> ResourcesInUseHelper::resourceTypes = {
+    "image",   "audio", "font",       "json",   "tilemap",
+    "tileset", "video", "bitmapFont", "model3D"};
+
+const std::vector<gd::String> &ResourcesInUseHelper::GetAllResources() {
+  allResources.clear();
+  for (auto &&resourceType : gd::ResourcesInUseHelper::resourceTypes) {
+    for (auto &&resourceName : GetAll(resourceType)) {
+      allResources.push_back(resourceName);
+    }
+  }
+  return allResources;
+}
+
+} // namespace gd

Core/GDCore/IDE/Project/ResourcesInUseHelper.h

@@ -4,9 +4,7 @@
  * reserved. This project is released under the MIT License.
  */
 
-#if defined(GD_IDE_ONLY)
-#ifndef IMAGESUSEDINVENTORIZER_H
-#define IMAGESUSEDINVENTORIZER_H
+#pragma once
 
 #include <set>
 #include <vector>
@@ -33,10 +31,12 @@ std::set<gd::String> & usedImages = resourcesInUse.GetAllImages();
  * \ingroup IDE
  */
 class ResourcesInUseHelper : public gd::ArbitraryResourceWorker {
- public:
-  ResourcesInUseHelper() : gd::ArbitraryResourceWorker(){};
+public:
+  ResourcesInUseHelper(gd::ResourcesManager &resourcesManager)
+      : gd::ArbitraryResourceWorker(resourcesManager){};
   virtual ~ResourcesInUseHelper(){};
 
+  const std::vector<gd::String>& GetAllResources();
   std::set<gd::String>& GetAllImages() { return GetAll("image"); };
   std::set<gd::String>& GetAllAudios() { return GetAll("audio"); };
   std::set<gd::String>& GetAllFonts() { return GetAll("font"); };
@@ -46,6 +46,8 @@ class ResourcesInUseHelper : public gd::ArbitraryResourceWorker {
   std::set<gd::String>& GetAllVideos() { return GetAll("video"); };
   std::set<gd::String>& GetAllBitmapFonts() { return GetAll("bitmapFont"); };
   std::set<gd::String>& GetAll3DModels() { return GetAll("model3D"); };
+  std::set<gd::String>& GetAllAtlases() { return GetAll("atlas"); };
+  std::set<gd::String>& GetAllSpines() { return GetAll("spine"); };
   std::set<gd::String>& GetAll(const gd::String& resourceType) {
     if (resourceType == "image") return allImages;
     if (resourceType == "audio") return allAudios;
@@ -56,6 +58,8 @@ class ResourcesInUseHelper : public gd::ArbitraryResourceWorker {
     if (resourceType == "video") return allVideos;
     if (resourceType == "bitmapFont") return allBitmapFonts;
     if (resourceType == "model3D") return allModel3Ds;
+    if (resourceType == "atlas") return allAtlases;
+    if (resourceType == "spine") return allSpines;
 
     return emptyResources;
   };
@@ -63,35 +67,42 @@ class ResourcesInUseHelper : public gd::ArbitraryResourceWorker {
   virtual void ExposeFile(gd::String& resource) override{
       /*Don't care, we just list resource names*/
   };
-  virtual void ExposeImage(gd::String& imageResourceName) override {
-    allImages.insert(imageResourceName);
+  virtual void ExposeImage(gd::String& resourceName) override {
+    allImages.insert(resourceName);
   };
-  virtual void ExposeAudio(gd::String& audioResourceName) override {
-    allAudios.insert(audioResourceName);
+  virtual void ExposeAudio(gd::String& resourceName) override {
+    allAudios.insert(resourceName);
   };
-  virtual void ExposeFont(gd::String& fontResourceName) override {
-    allFonts.insert(fontResourceName);
+  virtual void ExposeFont(gd::String& resourceName) override {
+    allFonts.insert(resourceName);
   };
-  virtual void ExposeJson(gd::String& jsonResourceName) override {
-    allJsons.insert(jsonResourceName);
+  virtual void ExposeJson(gd::String& resourceName) override {
+    allJsons.insert(resourceName);
   };
-  virtual void ExposeTilemap(gd::String& tilemapResourceName) override {
-    allTilemaps.insert(tilemapResourceName);
+  virtual void ExposeTilemap(gd::String& resourceName) override {
+    allTilemaps.insert(resourceName);
   };
-  virtual void ExposeTileset(gd::String& tilesetResourceName) override {
-    allTilesets.insert(tilesetResourceName);
+  virtual void ExposeTileset(gd::String& resourceName) override {
+    allTilesets.insert(resourceName);
   };
-  virtual void ExposeVideo(gd::String& videoResourceName) override {
-    allVideos.insert(videoResourceName);
+  virtual void ExposeVideo(gd::String& resourceName) override {
+    allVideos.insert(resourceName);
   };
-  virtual void ExposeBitmapFont(gd::String& bitmapFontResourceName) override {
-    allBitmapFonts.insert(bitmapFontResourceName);
+  virtual void ExposeBitmapFont(gd::String& resourceName) override {
+    allBitmapFonts.insert(resourceName);
   };
   virtual void ExposeModel3D(gd::String& resourceName) override {
     allModel3Ds.insert(resourceName);
   };
+  virtual void ExposeAtlas(gd::String& resourceName) override {
+    allAtlases.insert(resourceName);
+  };
+  virtual void ExposeSpine(gd::String& resourceName) override {
+    allSpines.insert(resourceName);
+  };
 
  protected:
+  std::vector<gd::String> allResources;
   std::set<gd::String> allImages;
   std::set<gd::String> allAudios;
   std::set<gd::String> allFonts;
@@ -101,10 +112,11 @@ class ResourcesInUseHelper : public gd::ArbitraryResourceWorker {
   std::set<gd::String> allVideos;
   std::set<gd::String> allBitmapFonts;
   std::set<gd::String> allModel3Ds;
+  std::set<gd::String> allAtlases;
+  std::set<gd::String> allSpines;
   std::set<gd::String> emptyResources;
+
+  static const std::vector<gd::String> resourceTypes;
 };
 
 }  // namespace gd
-
-#endif  // IMAGESUSEDINVENTORIZER_H
-#endif

Core/GDCore/IDE/Project/ResourcesMergingHelper.cpp

@@ -28,7 +28,7 @@ void ResourcesMergingHelper::ExposeFile(gd::String& resourceFilename) {
   auto stripToFilenameOnly = [&]() {
     fs.MakeAbsolute(resourceFullFilename, baseDirectory);
     SetNewFilename(resourceFullFilename, fs.FileNameFrom(resourceFullFilename));
-    resourceFilename = oldFilenames[resourceFullFilename];
+    resourceFilename = newFilenames[resourceFullFilename];
   };
 
   // if we do not want to preserve the folders at all,
@@ -45,7 +45,7 @@ void ResourcesMergingHelper::ExposeFile(gd::String& resourceFilename) {
     gd::String relativeFilename = resourceFullFilename;
     if (fs.MakeRelative(relativeFilename, baseDirectory)) {
       SetNewFilename(resourceFullFilename, relativeFilename);
-      resourceFilename = oldFilenames[resourceFullFilename];
+      resourceFilename = newFilenames[resourceFullFilename];
     } else {
       // The filename cannot be made relative. Consider that it is absolute.
       // Just strip the filename to its file part
@@ -63,7 +63,7 @@ void ResourcesMergingHelper::ExposeFile(gd::String& resourceFilename) {
 
 void ResourcesMergingHelper::SetNewFilename(gd::String oldFilename,
                                             gd::String newFilename) {
-  if (oldFilenames.find(oldFilename) != oldFilenames.end()) return;
+  if (newFilenames.find(oldFilename) != newFilenames.end()) return;
 
   // Extract baseName and extension from the new filename
   size_t extensionPos = newFilename.find_last_of(".");
@@ -80,13 +80,13 @@ void ResourcesMergingHelper::SetNewFilename(gd::String oldFilename,
       gd::NewNameGenerator::Generate(
           baseName,
           [this, extension](const gd::String& newBaseName) {
-            return newFilenames.find(newBaseName + extension) !=
-                   newFilenames.end();
+            return oldFilenames.find(newBaseName + extension) !=
+                   oldFilenames.end();
           }) +
       extension;
 
-  oldFilenames[oldFilename] = finalFilename;
-  newFilenames[finalFilename] = oldFilename;
+  newFilenames[oldFilename] = finalFilename;
+  oldFilenames[finalFilename] = oldFilename;
 }
 
 void ResourcesMergingHelper::SetBaseDirectory(

Core/GDCore/IDE/Project/ResourcesMergingHelper.h

@@ -28,11 +28,11 @@ namespace gd {
  * \ingroup IDE
  */
 class GD_CORE_API ResourcesMergingHelper : public ArbitraryResourceWorker {
- public:
-  ResourcesMergingHelper(gd::AbstractFileSystem& fileSystem)
-      : ArbitraryResourceWorker(),
-        preserveDirectoriesStructure(false),
-        preserveAbsoluteFilenames(false),
+public:
+  ResourcesMergingHelper(gd::ResourcesManager &resourcesManager,
+                         gd::AbstractFileSystem &fileSystem)
+      : ArbitraryResourceWorker(resourcesManager),
+        preserveDirectoriesStructure(false), preserveAbsoluteFilenames(false),
         fs(fileSystem){};
   virtual ~ResourcesMergingHelper(){};
 
@@ -64,19 +64,25 @@ class GD_CORE_API ResourcesMergingHelper : public ArbitraryResourceWorker {
    * the Base Directory.
    */
   std::map<gd::String, gd::String>& GetAllResourcesOldAndNewFilename() {
-    return oldFilenames;
+    return newFilenames;
   };
 
   /**
    * Resources merging helper collects all resources filenames and update these
    * filenames.
    */
-  virtual void ExposeFile(gd::String& resource) override;
+  void ExposeFile(gd::String& resource) override;
 
  protected:
   void SetNewFilename(gd::String oldFilename, gd::String newFilename);
 
+  /**
+   * Original file names that can be accessed by their new name.
+   */
   std::map<gd::String, gd::String> oldFilenames;
+  /**
+   * New file names that can be accessed by their original name.
+   */
   std::map<gd::String, gd::String> newFilenames;
   gd::String baseDirectory;
   bool preserveDirectoriesStructure;  ///< If set to true, the directory

Core/GDCore/IDE/Project/ResourcesRenamer.h

@@ -22,13 +22,16 @@ namespace gd {
  */
 class ResourcesRenamer : public gd::ArbitraryResourceWorker {
  public:
-  /**
-   * @brief Constructor taking the map from old name to new name.
-   * @param oldToNewNames_ A map associating to a resource name the new name to
-   * use.
-   */
-  ResourcesRenamer(const std::map<gd::String, gd::String>& oldToNewNames_)
-      : gd::ArbitraryResourceWorker(), oldToNewNames(oldToNewNames_){};
+   /**
+    * @brief Constructor taking the map from old name to new name.
+    * @param oldToNewNames_ A map associating to a resource name the new name to
+    * use.
+    */
+   ResourcesRenamer(gd::ResourcesManager &resourcesManager,
+                    const std::map<gd::String, gd::String> &oldToNewNames_)
+       : gd::ArbitraryResourceWorker(resourcesManager),
+         oldToNewNames(oldToNewNames_){};
+
   virtual ~ResourcesRenamer(){};
 
   virtual void ExposeFile(gd::String& resourceFileName) override{
@@ -62,6 +65,12 @@ class ResourcesRenamer : public gd::ArbitraryResourceWorker {
   virtual void ExposeModel3D(gd::String& resourceName) override {
     RenameIfNeeded(resourceName);
   };
+  virtual void ExposeAtlas(gd::String& resourceName) override {
+    RenameIfNeeded(resourceName);
+  };
+  virtual void ExposeSpine(gd::String& resourceName) override {
+    RenameIfNeeded(resourceName);
+  };
 
  private:
   void RenameIfNeeded(gd::String& resourceName) {

Core/GDCore/IDE/Project/SceneResourcesFinder.cpp

@@ -0,0 +1,37 @@
+/*
+ * GDevelop JS Platform
+ * Copyright 2008-2023 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "SceneResourcesFinder.h"
+
+#include "GDCore/IDE/ResourceExposer.h"
+#include "GDCore/Project/Layout.h"
+#include "GDCore/Project/Project.h"
+#include "GDCore/Serialization/SerializerElement.h"
+
+namespace gd {
+
+std::set<gd::String> SceneResourcesFinder::FindProjectResources(gd::Project &project) {
+  gd::SceneResourcesFinder resourceWorker(project.GetResourcesManager());
+
+  gd::ResourceExposer::ExposeProjectResources(project, resourceWorker);
+  return resourceWorker.resourceNames;
+}
+
+std::set<gd::String> SceneResourcesFinder::FindSceneResources(gd::Project &project,
+    gd::Layout &layout) {
+  gd::SceneResourcesFinder resourceWorker(project.GetResourcesManager());
+
+  gd::ResourceExposer::ExposeLayoutResources(project, layout, resourceWorker);
+  return resourceWorker.resourceNames;
+}
+
+void SceneResourcesFinder::AddUsedResource(gd::String &resourceName) {
+  if (resourceName.empty()) {
+    return;
+  }
+  resourceNames.insert(resourceName);
+}
+
+} // namespace gd

Core/GDCore/IDE/Project/SceneResourcesFinder.h

@@ -0,0 +1,93 @@
+/*
+ * GDevelop JS Platform
+ * Copyright 2008-2023 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+
+#pragma once
+
+#include "GDCore/IDE/Project/ArbitraryResourceWorker.h"
+#include "GDCore/String.h"
+
+#include <set>
+
+namespace gd {
+class Project;
+class Layout;
+class SerializerElement;
+} // namespace gd
+
+namespace gd {
+
+/**
+ * \brief Find resource usages in several parts of the project.
+ *
+ * \ingroup IDE
+ */
+class SceneResourcesFinder : private gd::ArbitraryResourceWorker {
+public:
+  /**
+   * @brief Find resource usages in a given scenes.
+   *
+   * It doesn't include resources used globally.
+   */
+  static std::set<gd::String> FindSceneResources(gd::Project &project,
+                                                      gd::Layout &layout);
+
+  /**
+   * @brief Find resource that are used globally in the project.
+   *
+   * It doesn't include resources used in scenes.
+   */
+  static std::set<gd::String> FindProjectResources(gd::Project &project);
+
+  virtual ~SceneResourcesFinder(){};
+
+private:
+  SceneResourcesFinder(gd::ResourcesManager &resourcesManager)
+      : gd::ArbitraryResourceWorker(resourcesManager){};
+
+  void AddUsedResource(gd::String &resourceName);
+
+  void ExposeFile(gd::String &resourceFileName) override{
+      // Don't do anything: we're renaming resources, not the files they are
+      // pointing to.
+  };
+  void ExposeImage(gd::String &imageResourceName) override {
+    AddUsedResource(imageResourceName);
+  };
+  void ExposeAudio(gd::String &audioResourceName) override {
+    AddUsedResource(audioResourceName);
+  };
+  void ExposeFont(gd::String &fontResourceName) override {
+    AddUsedResource(fontResourceName);
+  };
+  void ExposeJson(gd::String &jsonResourceName) override {
+    AddUsedResource(jsonResourceName);
+  };
+  void ExposeTilemap(gd::String &tilemapResourceName) override {
+    AddUsedResource(tilemapResourceName);
+  };
+  void ExposeTileset(gd::String &tilesetResourceName) override {
+    AddUsedResource(tilesetResourceName);
+  };
+  void ExposeVideo(gd::String &videoResourceName) override {
+    AddUsedResource(videoResourceName);
+  };
+  void ExposeBitmapFont(gd::String &bitmapFontName) override {
+    AddUsedResource(bitmapFontName);
+  };
+  void ExposeModel3D(gd::String &resourceName) override {
+    AddUsedResource(resourceName);
+  };
+  void ExposeAtlas(gd::String &resourceName) override {
+    AddUsedResource(resourceName);
+  };
+  void ExposeSpine(gd::String &resourceName) override {
+    AddUsedResource(resourceName);
+  };
+
+  std::set<gd::String> resourceNames;
+};
+
+} // namespace gd

Core/GDCore/IDE/ProjectBrowserHelper.cpp

@@ -20,6 +20,7 @@
 #include "GDCore/Project/Project.h"
 #include "GDCore/Project/ProjectScopedContainers.h"
 #include "GDCore/String.h"
+#include "GDCore/IDE/DependenciesAnalyzer.h"
 
 namespace gd {
 
@@ -33,27 +34,8 @@ void ProjectBrowserHelper::ExposeProjectEvents(
   // Add events based extensions
   for (std::size_t e = 0; e < project.GetEventsFunctionsExtensionsCount();
        e++) {
-    // Add (free) events functions
     auto &eventsFunctionsExtension = project.GetEventsFunctionsExtension(e);
-    for (auto &&eventsFunction : eventsFunctionsExtension.GetInternalVector()) {
-      worker.Launch(eventsFunction->GetEvents());
-    }
-
-    // Add (behavior) events functions
-    for (auto &&eventsBasedBehavior :
-         eventsFunctionsExtension.GetEventsBasedBehaviors()
-             .GetInternalVector()) {
-      ExposeEventsBasedBehaviorEvents(project, *eventsBasedBehavior, worker);
-    }
-
-    // Add (object) events functions
-    for (auto &&eventsBasedObject :
-         eventsFunctionsExtension.GetEventsBasedObjects().GetInternalVector()) {
-      auto &objectEventsFunctions = eventsBasedObject->GetEventsFunctions();
-      for (auto &&eventsFunction : objectEventsFunctions.GetInternalVector()) {
-        worker.Launch(eventsFunction->GetEvents());
-      }
-    }
+    ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(project, eventsFunctionsExtension, worker);
   }
 }
 
@@ -69,7 +51,7 @@ void ProjectBrowserHelper::ExposeProjectEventsWithoutExtensions(
   }
 }
 
-void ProjectBrowserHelper::ExposeLayoutEvents(
+void ProjectBrowserHelper::ExposeLayoutEventsAndExternalEvents(
     gd::Project &project, gd::Layout &layout,
     gd::ArbitraryEventsWorker &worker) {
 
@@ -85,7 +67,7 @@ void ProjectBrowserHelper::ExposeLayoutEvents(
   }
 }
 
-void ProjectBrowserHelper::ExposeLayoutEvents(
+void ProjectBrowserHelper::ExposeLayoutEventsAndExternalEvents(
     gd::Project &project, gd::Layout &layout,
     gd::ArbitraryEventsWorkerWithContext &worker) {
   auto projectScopedContainers =
@@ -103,6 +85,32 @@ void ProjectBrowserHelper::ExposeLayoutEvents(
   }
 }
 
+void ProjectBrowserHelper::ExposeLayoutEventsAndDependencies(
+    gd::Project &project, gd::Layout &layout,
+    gd::ArbitraryEventsWorker &worker) {
+  // Add layouts events
+  worker.Launch(layout.GetEvents());
+
+  DependenciesAnalyzer dependenciesAnalyzer(project, layout);
+  bool hasCircularDependencies = !dependenciesAnalyzer.Analyze();
+  if (hasCircularDependencies) {
+    // The analyzer stops when it finds circular dependencies so the dependencies are not complete.
+    // TODO Should the analyzer still continue to avoid side effect on thing that would not be code generation related?
+    // Maybe a boolean parameter should be added?
+    return;
+  }
+  for (const gd::String& externalEventName : dependenciesAnalyzer.GetExternalEventsDependencies()) {
+    gd::ExternalEvents& externalEvents = project.GetExternalEvents(externalEventName);
+
+    worker.Launch(externalEvents.GetEvents());
+  }
+  for (const gd::String& sceneName : dependenciesAnalyzer.GetScenesDependencies()) {
+    gd::Layout& dependencyLayout = project.GetLayout(sceneName);
+    
+    worker.Launch(dependencyLayout.GetEvents());
+  }
+}
+
 void ProjectBrowserHelper::ExposeProjectEvents(
     gd::Project &project, gd::ArbitraryEventsWorkerWithContext &worker) {
   // See also gd::Project::ExposeResources for a method that traverse the whole
@@ -130,8 +138,43 @@ void ProjectBrowserHelper::ExposeProjectEvents(
   // Add events based extensions
   for (std::size_t e = 0; e < project.GetEventsFunctionsExtensionsCount();
        e++) {
-    // Add (free) events functions
     auto &eventsFunctionsExtension = project.GetEventsFunctionsExtension(e);
+    ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(project, eventsFunctionsExtension, worker);
+  }
+}
+
+void ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(
+    gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    gd::ArbitraryEventsWorker &worker) {
+    // Add (free) events functions
+    for (auto &&eventsFunction : eventsFunctionsExtension.GetInternalVector()) {
+      gd::ObjectsContainer globalObjectsAndGroups;
+      gd::ObjectsContainer objectsAndGroups;
+      gd::EventsFunctionTools::FreeEventsFunctionToObjectsContainer(
+          project, eventsFunctionsExtension, *eventsFunction,
+          globalObjectsAndGroups, objectsAndGroups);
+
+      worker.Launch(eventsFunction->GetEvents());
+    }
+
+    // Add (behavior) events functions
+    for (auto &&eventsBasedBehavior :
+         eventsFunctionsExtension.GetEventsBasedBehaviors()
+             .GetInternalVector()) {
+      ExposeEventsBasedBehaviorEvents(project, *eventsBasedBehavior, worker);
+    }
+
+    // Add (object) events functions
+    for (auto &&eventsBasedObject :
+         eventsFunctionsExtension.GetEventsBasedObjects().GetInternalVector()) {
+      ExposeEventsBasedObjectEvents(project, *eventsBasedObject, worker);
+    }
+}
+
+void ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(
+    gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    gd::ArbitraryEventsWorkerWithContext &worker) {
+    // Add (free) events functions
     for (auto &&eventsFunction : eventsFunctionsExtension.GetInternalVector()) {
       gd::ObjectsContainer globalObjectsAndGroups;
       gd::ObjectsContainer objectsAndGroups;
@@ -140,7 +183,7 @@ void ProjectBrowserHelper::ExposeProjectEvents(
           globalObjectsAndGroups, objectsAndGroups);
       auto projectScopedContainers =
         gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(globalObjectsAndGroups, objectsAndGroups);
-      projectScopedContainers.AddParameters(eventsFunction->GetParameters());
+      projectScopedContainers.AddParameters(eventsFunction->GetParametersForEvents(eventsFunctionsExtension));
 
       worker.Launch(eventsFunction->GetEvents(), projectScopedContainers);
     }
@@ -157,7 +200,6 @@ void ProjectBrowserHelper::ExposeProjectEvents(
          eventsFunctionsExtension.GetEventsBasedObjects().GetInternalVector()) {
       ExposeEventsBasedObjectEvents(project, *eventsBasedObject, worker);
     }
-  }
 }
 
 void ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
@@ -183,12 +225,27 @@ void ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
       gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(globalObjectsAndGroups, objectsAndGroups);
     projectScopedContainers.AddPropertiesContainer(eventsBasedBehavior.GetSharedPropertyDescriptors());
     projectScopedContainers.AddPropertiesContainer(eventsBasedBehavior.GetPropertyDescriptors());
-    projectScopedContainers.AddParameters(eventsFunction->GetParameters());
+    projectScopedContainers.AddParameters(eventsFunction->GetParametersForEvents(eventsBasedBehavior.GetEventsFunctions()));
 
     worker.Launch(eventsFunction->GetEvents(), projectScopedContainers);
   }
 }
 
+void ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
+    gd::Project &project, const gd::EventsBasedObject &eventsBasedObject,
+    gd::ArbitraryEventsWorker &worker) {
+  auto &objectEventsFunctions = eventsBasedObject.GetEventsFunctions();
+  for (auto &&eventsFunction : objectEventsFunctions.GetInternalVector()) {
+    gd::ObjectsContainer globalObjectsAndGroups;
+    gd::ObjectsContainer objectsAndGroups;
+    gd::EventsFunctionTools::ObjectEventsFunctionToObjectsContainer(
+        project, eventsBasedObject, *eventsFunction, globalObjectsAndGroups,
+        objectsAndGroups);
+
+    worker.Launch(eventsFunction->GetEvents());
+  }
+}
+
 void ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
     gd::Project &project, const gd::EventsBasedObject &eventsBasedObject,
     gd::ArbitraryEventsWorkerWithContext &worker) {
@@ -202,7 +259,7 @@ void ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
     auto projectScopedContainers =
       gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(globalObjectsAndGroups, objectsAndGroups);
     projectScopedContainers.AddPropertiesContainer(eventsBasedObject.GetPropertyDescriptors());
-    projectScopedContainers.AddParameters(eventsFunction->GetParameters());
+    projectScopedContainers.AddParameters(eventsFunction->GetParametersForEvents(eventsBasedObject.GetEventsFunctions()));
 
     worker.Launch(eventsFunction->GetEvents(), projectScopedContainers);
   }
@@ -216,7 +273,7 @@ void ProjectBrowserHelper::ExposeProjectObjects(
 
   // Layout objects
   for (size_t i = 0; i < project.GetLayoutsCount(); i++) {
-    worker.Launch(project.GetLayout(i));
+    gd::ProjectBrowserHelper::ExposeLayoutObjects(project.GetLayout(i), worker);
   }
 
   // Event based objects children
@@ -232,6 +289,14 @@ void ProjectBrowserHelper::ExposeProjectObjects(
   }
 };
 
+void ProjectBrowserHelper::ExposeLayoutObjects(gd::Layout &layout,
+                                  gd::ArbitraryObjectsWorker &worker) {
+  // In the future, layouts may have children object containers.
+
+  // Layout objects
+  worker.Launch(layout);
+}
+
 void ProjectBrowserHelper::ExposeProjectFunctions(
     gd::Project &project, gd::ArbitraryEventsFunctionsWorker &worker) {
 

Core/GDCore/IDE/ProjectBrowserHelper.h

@@ -60,18 +60,52 @@ public:
    * \brief Call the specified worker on all events of a layout and
    * its external events.
    */
-  static void ExposeLayoutEvents(gd::Project &project, gd::Layout &layout,
+  static void ExposeLayoutEventsAndExternalEvents(gd::Project &project, gd::Layout &layout,
                                  gd::ArbitraryEventsWorker &worker);
+
   /**
    * \brief Call the specified worker on all events of a layout and
    * its external events.
    */
-  static void ExposeLayoutEvents(gd::Project &project, gd::Layout &layout,
+  static void ExposeLayoutEventsAndExternalEvents(gd::Project &project, gd::Layout &layout,
                                  gd::ArbitraryEventsWorkerWithContext &worker);
 
+  /**
+   * \brief Call the specified worker on all events of a layout and
+   * its dependencies according to EventLink (external events or other layout
+   * events).
+   */
+  static void
+  ExposeLayoutEventsAndDependencies(gd::Project &project, gd::Layout &layout,
+                                    gd::ArbitraryEventsWorker &worker);
+
   /**
    * \brief Call the specified worker on all events of the event-based
-   * behavior
+   * extension.
+   *
+   * This should be the preferred way to traverse all the events of an events
+   * based extension.
+   */
+  static void ExposeEventsFunctionsExtensionEvents(
+      gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      gd::ArbitraryEventsWorker &worker);
+
+  /**
+   * \brief Call the specified worker on all events of the event-based
+   * extension.
+   *
+   * This should be the preferred way to traverse all the events of an events
+   * based extension.
+   */
+  static void ExposeEventsFunctionsExtensionEvents(
+      gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      gd::ArbitraryEventsWorkerWithContext &worker);
+
+  /**
+   * \brief Call the specified worker on all events of the event-based
+   * behavior.
    *
    * This should be the preferred way to traverse all the events of an events
    * based behavior.
@@ -93,10 +127,22 @@ public:
 
   /**
    * \brief Call the specified worker on all events of the event-based
-   * behavior.
+   * object.
    *
    * This should be the preferred way to traverse all the events of an
-   * event-based behavior.
+   * event-based object.
+   */
+  static void
+  ExposeEventsBasedObjectEvents(gd::Project &project,
+                                const gd::EventsBasedObject &eventsBasedObject,
+                                gd::ArbitraryEventsWorker &worker);
+
+  /**
+   * \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.
    */
   static void
   ExposeEventsBasedObjectEvents(gd::Project &project,
@@ -112,6 +158,14 @@ public:
   static void ExposeProjectObjects(gd::Project &project,
                                    gd::ArbitraryObjectsWorker &worker);
 
+  /**
+   * \brief Call the specified worker on all ObjectContainers of the layout.
+   *
+   * This should be the preferred way to traverse all the objects of a layout.
+   */
+  static void ExposeLayoutObjects(gd::Layout &layout,
+                                  gd::ArbitraryObjectsWorker &worker);
+
   /**
    * \brief Call the specified worker on all FunctionsContainers of the project
    * (global, layouts...)

Core/GDCore/IDE/PropertyFunctionGenerator.cpp

@@ -128,11 +128,7 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
     } else {
       gd::Instruction action;
       action.SetType("SetReturn" + numberOrString);
-      gd::String receiver = isBehavior ? "Object.Behavior::" : "Object.";
-      gd::String propertyPrefix =
-          (isSharedProperties ? "SharedProperty" : "Property");
-      action.AddParameter(receiver + propertyPrefix + property.GetName() +
-                          "()");
+      action.AddParameter(property.GetName());
       event.GetActions().Insert(action, 0);
     }
   }
@@ -233,15 +229,13 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
       gd::Instruction action;
       action.SetType(setterType);
       action.AddParameter("Object");
-      gd::String parameterGetterCall =
-          "GetArgumentAs" + numberOrString + "(\"Value\")";
       if (isBehavior) {
         action.AddParameter("Behavior");
         action.AddParameter("=");
-        action.AddParameter(parameterGetterCall);
+        action.AddParameter("Value");
       } else {
         action.AddParameter("=");
-        action.AddParameter(parameterGetterCall);
+        action.AddParameter("Value");
       }
       event.GetActions().Insert(action, 0);
     }

Core/GDCore/IDE/ResourceExposer.cpp

@@ -24,6 +24,7 @@
 #include "GDCore/Extensions/Platform.h"
 #include "GDCore/Extensions/Metadata/MetadataProvider.h"
 #include "GDCore/Extensions/Metadata/EffectMetadata.h"
+#include "GDCore/IDE/Events/UsedExtensionsFinder.h"
 
 namespace gd {
 
@@ -32,10 +33,9 @@ void ResourceExposer::ExposeWholeProjectResources(gd::Project& project, gd::Arbi
   // traverse the whole project (this time for events) and ExposeProjectEffects
   // (this time for effects).
 
-  gd::ResourcesManager* resourcesManager = &(project.GetResourcesManager());
-
   // Expose any project resources as files.
-  worker.ExposeResources(resourcesManager);
+  worker.ExposeResources();
+
   project.GetPlatformSpecificAssets().ExposeResources(worker);
 
   // Expose event resources
@@ -73,6 +73,49 @@ void ResourceExposer::ExposeWholeProjectResources(gd::Project& project, gd::Arbi
     worker.ExposeImage(loadingScreen.GetBackgroundImageResourceName());
 }
 
+void ResourceExposer::ExposeProjectResources(gd::Project& project, gd::ArbitraryResourceWorker& worker) {
+  // Expose global objects configuration resources
+  auto objectWorker = gd::GetResourceWorkerOnObjects(project, worker);
+  objectWorker.Launch(project);
+}
+
+void ResourceExposer::ExposeLayoutResources(
+    gd::Project &project, gd::Layout &layout,
+    gd::ArbitraryResourceWorker &worker) {
+
+  // Expose object configuration resources
+  auto objectWorker = gd::GetResourceWorkerOnObjects(project, worker);
+  gd::ProjectBrowserHelper::ExposeLayoutObjects(layout, objectWorker);
+
+  // Expose layer effect resources
+  for (std::size_t layerIndex = 0; layerIndex < layout.GetLayersCount();
+       layerIndex++) {
+    auto &layer = layout.GetLayer(layerIndex);
+
+    auto &effects = layer.GetEffects();
+    for (size_t effectIndex = 0; effectIndex < effects.GetEffectsCount();
+         effectIndex++) {
+      auto &effect = effects.GetEffect(effectIndex);
+      gd::ResourceExposer::ExposeEffectResources(project.GetCurrentPlatform(),
+                                                 effect, worker);
+    }
+  }
+
+  // Expose event resources
+  auto eventWorker = gd::GetResourceWorkerOnEvents(project, worker);
+  gd::ProjectBrowserHelper::ExposeLayoutEventsAndDependencies(project, layout,
+                                                              eventWorker);
+
+  // Exposed extension event resources
+  // Note that using resources in extensions is very unlikely and probably not
+  // worth the effort of something smart.
+  for (std::size_t e = 0; e < project.GetEventsFunctionsExtensionsCount();
+       e++) {
+    auto &eventsFunctionsExtension = project.GetEventsFunctionsExtension(e);
+    gd::ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(project, eventsFunctionsExtension, eventWorker);
+  }
+}
+
 void ResourceExposer::ExposeEffectResources(
     gd::Platform &platform, gd::Effect &effect,
     gd::ArbitraryResourceWorker &worker) {
@@ -88,11 +131,13 @@ void ResourceExposer::ExposeEffectResources(
       auto &resourceType = propertyDescriptor.GetExtraInfo()[0];
 
       const gd::String &resourceName = effect.GetStringParameter(propertyName);
-      gd::String potentiallyUpdatedResourceName = resourceName;
-      worker.ExposeResourceWithType(resourceType,
-                                    potentiallyUpdatedResourceName);
-      if (potentiallyUpdatedResourceName != resourceName) {
-        effect.SetStringParameter(propertyName, potentiallyUpdatedResourceName);
+      if (!resourceName.empty()) {
+        gd::String potentiallyUpdatedResourceName = resourceName;
+        worker.ExposeResourceWithType(resourceType,
+                                      potentiallyUpdatedResourceName);
+        if (potentiallyUpdatedResourceName != resourceName) {
+          effect.SetStringParameter(propertyName, potentiallyUpdatedResourceName);
+        }
       }
     }
   }

Core/GDCore/IDE/ResourceExposer.h

@@ -10,6 +10,7 @@ class Platform;
 class Project;
 class ArbitraryResourceWorker;
 class Effect;
+class Layout;
 } // namespace gd
 
 namespace gd {
@@ -31,6 +32,25 @@ public:
   static void ExposeWholeProjectResources(gd::Project &project,
                                           gd::ArbitraryResourceWorker &worker);
 
+  /**
+   * @brief Expose only the resources used globally on a project.
+   * 
+   * It doesn't include resources used in layouts.
+   */
+  static void ExposeProjectResources(gd::Project &project,
+                                     gd::ArbitraryResourceWorker &worker);
+
+  /**
+   * @brief Expose the resources used in a given layout.
+   * 
+   * It doesn't include resources used globally.
+   */
+  static void ExposeLayoutResources(gd::Project &project, gd::Layout &layout,
+                                          gd::ArbitraryResourceWorker &worker);
+
+  /**
+   * @brief Expose the resources used in a given effect.
+   */
   static void ExposeEffectResources(gd::Platform &platform, gd::Effect &effect,
                                     gd::ArbitraryResourceWorker &worker);
 };

Core/GDCore/IDE/WholeProjectRefactorer.cpp

@@ -16,8 +16,8 @@
 #include "GDCore/IDE/Events/BehaviorTypeRenamer.h"
 #include "GDCore/IDE/Events/CustomObjectTypeRenamer.h"
 #include "GDCore/IDE/Events/EventsBehaviorRenamer.h"
-#include "GDCore/IDE/Events/EventsRefactorer.h"
 #include "GDCore/IDE/Events/EventsPropertyReplacer.h"
+#include "GDCore/IDE/Events/EventsRefactorer.h"
 #include "GDCore/IDE/Events/EventsVariableReplacer.h"
 #include "GDCore/IDE/Events/ExpressionsParameterMover.h"
 #include "GDCore/IDE/Events/ExpressionsRenamer.h"
@@ -138,7 +138,8 @@ void WholeProjectRefactorer::EnsureObjectEventsFunctionsProperParameters(
   }
 }
 
-VariablesChangeset WholeProjectRefactorer::ComputeChangesetForVariablesContainer(
+VariablesChangeset
+WholeProjectRefactorer::ComputeChangesetForVariablesContainer(
     gd::Project &project,
     const gd::SerializerElement &oldSerializedVariablesContainer,
     const gd::VariablesContainer &newVariablesContainer) {
@@ -149,9 +150,9 @@ VariablesChangeset WholeProjectRefactorer::ComputeChangesetForVariablesContainer
 
   if (oldVariablesContainer.GetPersistentUuid() !=
       newVariablesContainer.GetPersistentUuid()) {
-    gd::LogWarning(
-        _("Called ComputeChangesetForVariablesContainer on variables containers "
-          "that are different - they can't be compared."));
+    gd::LogWarning(_(
+        "Called ComputeChangesetForVariablesContainer on variables containers "
+        "that are different - they can't be compared."));
     return changeset;
   }
 
@@ -192,14 +193,11 @@ VariablesChangeset WholeProjectRefactorer::ComputeChangesetForVariablesContainer
 }
 
 void WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
-    gd::Project &project,
-    const gd::VariablesContainer &newVariablesContainer,
-    const gd::VariablesChangeset& changeset) {
+    gd::Project &project, const gd::VariablesContainer &newVariablesContainer,
+    const gd::VariablesChangeset &changeset) {
   gd::EventsVariableReplacer eventsVariableReplacer(
-      project.GetCurrentPlatform(),
-      newVariablesContainer,
-      changeset.oldToNewVariableNames,
-      changeset.removedVariableNames);
+      project.GetCurrentPlatform(), newVariablesContainer,
+      changeset.oldToNewVariableNames, changeset.removedVariableNames);
   gd::ProjectBrowserHelper::ExposeProjectEvents(project,
                                                 eventsVariableReplacer);
 }
@@ -743,14 +741,14 @@ void WholeProjectRefactorer::RenameEventsBasedBehaviorProperty(
         EventsBasedBehavior::GetPropertyExpressionName(newPropertyName));
     gd::ProjectBrowserHelper::ExposeProjectEvents(project, expressionRenamer);
 
-    std::unordered_map<gd::String, gd::String> oldToNewPropertyNames = {{oldPropertyName, newPropertyName}};
+    std::unordered_map<gd::String, gd::String> oldToNewPropertyNames = {
+        {oldPropertyName, newPropertyName}};
     std::unordered_set<gd::String> removedPropertyNames;
     gd::EventsPropertyReplacer eventsPropertyReplacer(
-      project.GetCurrentPlatform(),
-      properties,
-      oldToNewPropertyNames,
-      removedPropertyNames);
-    gd::ProjectBrowserHelper::ExposeProjectEvents(project, eventsPropertyReplacer);
+        project.GetCurrentPlatform(), properties, oldToNewPropertyNames,
+        removedPropertyNames);
+    gd::ProjectBrowserHelper::ExposeProjectEvents(project,
+                                                  eventsPropertyReplacer);
 
     gd::InstructionsTypeRenamer actionRenamer = gd::InstructionsTypeRenamer(
         project,
@@ -813,14 +811,14 @@ void WholeProjectRefactorer::RenameEventsBasedBehaviorSharedProperty(
         EventsBasedBehavior::GetSharedPropertyExpressionName(newPropertyName));
     gd::ProjectBrowserHelper::ExposeProjectEvents(project, expressionRenamer);
 
-    std::unordered_map<gd::String, gd::String> oldToNewPropertyNames = {{oldPropertyName, newPropertyName}};
+    std::unordered_map<gd::String, gd::String> oldToNewPropertyNames = {
+        {oldPropertyName, newPropertyName}};
     std::unordered_set<gd::String> removedPropertyNames;
     gd::EventsPropertyReplacer eventsPropertyReplacer(
-      project.GetCurrentPlatform(),
-      properties,
-      oldToNewPropertyNames,
-      removedPropertyNames);
-    gd::ProjectBrowserHelper::ExposeProjectEvents(project, eventsPropertyReplacer);
+        project.GetCurrentPlatform(), properties, oldToNewPropertyNames,
+        removedPropertyNames);
+    gd::ProjectBrowserHelper::ExposeProjectEvents(project,
+                                                  eventsPropertyReplacer);
 
     gd::InstructionsTypeRenamer actionRenamer = gd::InstructionsTypeRenamer(
         project,
@@ -870,14 +868,14 @@ void WholeProjectRefactorer::RenameEventsBasedObjectProperty(
       EventsBasedObject::GetPropertyExpressionName(newPropertyName));
   gd::ProjectBrowserHelper::ExposeProjectEvents(project, expressionRenamer);
 
-  std::unordered_map<gd::String, gd::String> oldToNewPropertyNames = {{oldPropertyName, newPropertyName}};
+  std::unordered_map<gd::String, gd::String> oldToNewPropertyNames = {
+      {oldPropertyName, newPropertyName}};
   std::unordered_set<gd::String> removedPropertyNames;
   gd::EventsPropertyReplacer eventsPropertyReplacer(
-    project.GetCurrentPlatform(),
-    properties,
-    oldToNewPropertyNames,
-    removedPropertyNames);
-  gd::ProjectBrowserHelper::ExposeProjectEvents(project, eventsPropertyReplacer);
+      project.GetCurrentPlatform(), properties, oldToNewPropertyNames,
+      removedPropertyNames);
+  gd::ProjectBrowserHelper::ExposeProjectEvents(project,
+                                                eventsPropertyReplacer);
 
   gd::InstructionsTypeRenamer actionRenamer = gd::InstructionsTypeRenamer(
       project,
@@ -1351,7 +1349,6 @@ void WholeProjectRefactorer::DoRenameBehavior(
     gd::Project &project, const gd::String &oldBehaviorType,
     const gd::String &newBehaviorType,
     const gd::ProjectBrowser &projectBrowser) {
-
   // Rename behavior in required behavior properties
   auto requiredBehaviorRenamer =
       gd::RequiredBehaviorRenamer(oldBehaviorType, newBehaviorType);
@@ -1378,7 +1375,6 @@ void WholeProjectRefactorer::DoRenameBehavior(
 void WholeProjectRefactorer::DoRenameObject(
     gd::Project &project, const gd::String &oldObjectType,
     const gd::String &newObjectType, const gd::ProjectBrowser &projectBrowser) {
-
   // Rename object type in objects lists.
   auto customObjectTypeRenamer =
       gd::CustomObjectTypeRenamer(oldObjectType, newObjectType);
@@ -1398,7 +1394,8 @@ void WholeProjectRefactorer::DoRenameObject(
 void WholeProjectRefactorer::ObjectOrGroupRemovedInLayout(
     gd::Project &project, gd::Layout &layout, const gd::String &objectName,
     bool isObjectGroup, bool removeEventsAndGroups) {
-  auto projectScopedContainers = gd::ProjectScopedContainers::MakeNewProjectScopedContainersForProjectAndLayout(project, layout);
+  auto projectScopedContainers = gd::ProjectScopedContainers::
+      MakeNewProjectScopedContainersForProjectAndLayout(project, layout);
 
   // Remove object in the current layout
   if (removeEventsAndGroups) {
@@ -1447,7 +1444,8 @@ void WholeProjectRefactorer::ObjectOrGroupRenamedInLayout(
   if (oldName == newName || newName.empty() || oldName.empty())
     return;
 
-  auto projectScopedContainers = gd::ProjectScopedContainers::MakeNewProjectScopedContainersForProjectAndLayout(project, layout);
+  auto projectScopedContainers = gd::ProjectScopedContainers::
+      MakeNewProjectScopedContainersForProjectAndLayout(project, layout);
 
   // Rename object in the current layout
   gd::EventsRefactorer::RenameObjectInEvents(
@@ -1536,10 +1534,19 @@ void WholeProjectRefactorer::RenameLayer(gd::Project &project,
                                          const gd::String &newName) {
   if (oldName == newName || newName.empty() || oldName.empty())
     return;
+
   gd::ProjectElementRenamer projectElementRenamer(project.GetCurrentPlatform(),
                                                   "layer", oldName, newName);
-  gd::ProjectBrowserHelper::ExposeLayoutEvents(project, layout,
-                                               projectElementRenamer);
+  gd::ProjectBrowserHelper::ExposeLayoutEventsAndExternalEvents(
+      project, layout, projectElementRenamer);
+  layout.GetInitialInstances().MoveInstancesToLayer(oldName, newName);
+
+  std::vector<gd::String> externalLayoutsNames =
+      GetAssociatedExternalLayouts(project, layout);
+  for (gd::String name : externalLayoutsNames) {
+    auto &externalLayout = project.GetExternalLayout(name);
+    externalLayout.GetInitialInstances().MoveInstancesToLayer(oldName, newName);
+  }
 }
 
 void WholeProjectRefactorer::RenameLayerEffect(gd::Project &project,
@@ -1552,8 +1559,8 @@ void WholeProjectRefactorer::RenameLayerEffect(gd::Project &project,
   gd::ProjectElementRenamer projectElementRenamer(
       project.GetCurrentPlatform(), "layerEffectName", oldName, newName);
   projectElementRenamer.SetLayerConstraint(layer.GetName());
-  gd::ProjectBrowserHelper::ExposeLayoutEvents(project, layout,
-                                               projectElementRenamer);
+  gd::ProjectBrowserHelper::ExposeLayoutEventsAndExternalEvents(
+      project, layout, projectElementRenamer);
 }
 
 void WholeProjectRefactorer::RenameObjectAnimation(gd::Project &project,
@@ -1566,8 +1573,8 @@ void WholeProjectRefactorer::RenameObjectAnimation(gd::Project &project,
   gd::ProjectElementRenamer projectElementRenamer(
       project.GetCurrentPlatform(), "objectAnimationName", oldName, newName);
   projectElementRenamer.SetObjectConstraint(object.GetName());
-  gd::ProjectBrowserHelper::ExposeLayoutEvents(project, layout,
-                                               projectElementRenamer);
+  gd::ProjectBrowserHelper::ExposeLayoutEventsAndExternalEvents(
+      project, layout, projectElementRenamer);
 }
 
 void WholeProjectRefactorer::RenameObjectPoint(gd::Project &project,
@@ -1580,8 +1587,8 @@ void WholeProjectRefactorer::RenameObjectPoint(gd::Project &project,
   gd::ProjectElementRenamer projectElementRenamer(
       project.GetCurrentPlatform(), "objectPointName", oldName, newName);
   projectElementRenamer.SetObjectConstraint(object.GetName());
-  gd::ProjectBrowserHelper::ExposeLayoutEvents(project, layout,
-                                               projectElementRenamer);
+  gd::ProjectBrowserHelper::ExposeLayoutEventsAndExternalEvents(
+      project, layout, projectElementRenamer);
 }
 
 void WholeProjectRefactorer::RenameObjectEffect(gd::Project &project,
@@ -1594,8 +1601,8 @@ void WholeProjectRefactorer::RenameObjectEffect(gd::Project &project,
   gd::ProjectElementRenamer projectElementRenamer(
       project.GetCurrentPlatform(), "objectEffectName", oldName, newName);
   projectElementRenamer.SetObjectConstraint(object.GetName());
-  gd::ProjectBrowserHelper::ExposeLayoutEvents(project, layout,
-                                               projectElementRenamer);
+  gd::ProjectBrowserHelper::ExposeLayoutEventsAndExternalEvents(
+      project, layout, projectElementRenamer);
 }
 
 void WholeProjectRefactorer::ObjectOrGroupRemovedInEventsBasedObject(
@@ -1617,9 +1624,12 @@ void WholeProjectRefactorer::ObjectOrGroupRemovedInEventsFunction(
     gd::ObjectsContainer &globalObjectsContainer,
     gd::ObjectsContainer &objectsContainer, const gd::String &objectName,
     bool isObjectGroup, bool removeEventsAndGroups) {
-  // In theory we should pass a ProjectScopedContainers to this function so it does not have to construct one.
-  // In practice, this is ok because we only deal with objects.
-  auto projectScopedContainers = gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(globalObjectsContainer, objectsContainer);
+  // In theory we should pass a ProjectScopedContainers to this function so it
+  // does not have to construct one. In practice, this is ok because we only
+  // deal with objects.
+  auto projectScopedContainers =
+      gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(
+          globalObjectsContainer, objectsContainer);
 
   if (removeEventsAndGroups) {
     gd::EventsRefactorer::RemoveObjectInEvents(
@@ -1655,9 +1665,12 @@ void WholeProjectRefactorer::ObjectOrGroupRenamedInEventsFunction(
     gd::ObjectsContainer &globalObjectsContainer,
     gd::ObjectsContainer &objectsContainer, const gd::String &oldName,
     const gd::String &newName, bool isObjectGroup) {
-  // In theory we should pass a ProjectScopedContainers to this function so it does not have to construct one.
-  // In practice, this is ok because we only deal with objects.
-  auto projectScopedContainers = gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(globalObjectsContainer, objectsContainer);
+  // In theory we should pass a ProjectScopedContainers to this function so it
+  // does not have to construct one. In practice, this is ok because we only
+  // deal with objects.
+  auto projectScopedContainers =
+      gd::ProjectScopedContainers::MakeNewProjectScopedContainersFor(
+          globalObjectsContainer, objectsContainer);
 
   gd::EventsRefactorer::RenameObjectInEvents(
       project.GetCurrentPlatform(), projectScopedContainers,
@@ -1705,7 +1718,7 @@ void WholeProjectRefactorer::GlobalObjectOrGroupRemoved(
     if (layout.HasObjectNamed(objectName))
       continue;
 
-        ObjectOrGroupRemovedInLayout(project, layout, objectName, isObjectGroup,
+    ObjectOrGroupRemovedInLayout(project, layout, objectName, isObjectGroup,
                                  removeEventsAndGroups);
   }
 }
@@ -1753,7 +1766,8 @@ size_t WholeProjectRefactorer::GetLayoutAndExternalLayoutLayerInstancesCount(
       GetAssociatedExternalLayouts(project, layout);
   for (gd::String name : externalLayoutsNames) {
     auto &externalLayout = project.GetExternalLayout(name);
-    count += externalLayout.GetInitialInstances().GetLayerInstancesCount(layerName);
+    count +=
+        externalLayout.GetInitialInstances().GetLayerInstancesCount(layerName);
   }
   return count;
 }

Core/GDCore/Project/CustomConfigurationHelper.cpp

@@ -5,6 +5,8 @@
  */
 #include "CustomConfigurationHelper.h"
 
+#include <map>
+
 #include "GDCore/IDE/Project/ArbitraryResourceWorker.h"
 #include "GDCore/Project/Behavior.h"
 #include "GDCore/Project/Project.h"
@@ -13,8 +15,6 @@
 #include "GDCore/Serialization/Serializer.h"
 #include "GDCore/Serialization/SerializerElement.h"
 
-#include <map>
-
 using namespace gd;
 
 void CustomConfigurationHelper::InitializeContent(
@@ -25,7 +25,8 @@ void CustomConfigurationHelper::InitializeContent(
     auto propertyType = property->GetType();
 
     if (propertyType == "String" || propertyType == "Choice" ||
-        propertyType == "Color" || propertyType == "Behavior") {
+        propertyType == "Color" || propertyType == "Behavior" ||
+        propertyType == "resource") {
       element.SetStringValue(property->GetValue());
     } else if (propertyType == "Number") {
       element.SetDoubleValue(property->GetValue().To<double>());
@@ -51,7 +52,8 @@ std::map<gd::String, gd::PropertyDescriptor> CustomConfigurationHelper::GetPrope
 
     if (configurationContent.HasChild(propertyName)) {
       if (propertyType == "String" || propertyType == "Choice" ||
-          propertyType == "Color" || propertyType == "Behavior") {
+          propertyType == "Color" || propertyType == "Behavior" ||
+          propertyType == "resource") {
         newProperty.SetValue(
             configurationContent.GetChild(propertyName).GetStringValue());
       } else if (propertyType == "Number") {
@@ -59,8 +61,9 @@ std::map<gd::String, gd::PropertyDescriptor> CustomConfigurationHelper::GetPrope
             configurationContent.GetChild(propertyName).GetDoubleValue()));
       } else if (propertyType == "Boolean") {
         newProperty.SetValue(
-            configurationContent.GetChild(propertyName).GetBoolValue() ? "true"
-                                                                  : "false");
+            configurationContent.GetChild(propertyName).GetBoolValue()
+                ? "true"
+                : "false");
       }
     } else {
       // No value was serialized for this property. `newProperty`
@@ -85,7 +88,8 @@ bool CustomConfigurationHelper::UpdateProperty(
   const gd::String &propertyType = property.GetType();
 
   if (propertyType == "String" || propertyType == "Choice" ||
-      propertyType == "Color" || propertyType == "Behavior") {
+      propertyType == "Color" || propertyType == "Behavior" ||
+      propertyType == "resource") {
     element.SetStringValue(newValue);
   } else if (propertyType == "Number") {
     element.SetDoubleValue(newValue.To<double>());

Core/GDCore/Project/CustomObjectConfiguration.cpp

@@ -155,6 +155,10 @@ void CustomObjectConfiguration::ExposeResources(gd::ArbitraryResourceWorker& wor
         worker.ExposeBitmapFont(newPropertyValue);
       } else if (resourceType == "model3D") {
         worker.ExposeModel3D(newPropertyValue);
+      } else if (resourceType == "atlas") {
+        worker.ExposeAtlas(newPropertyValue);
+      } else if (resourceType == "spine") {
+        worker.ExposeSpine(newPropertyValue);
       }
 
       if (newPropertyValue != oldPropertyValue) {

Core/GDCore/Project/EventsBasedObject.cpp

@@ -17,7 +17,7 @@ EventsBasedObject::EventsBasedObject()
 }
 
 EventsBasedObject::~EventsBasedObject() {}
-    
+
 EventsBasedObject::EventsBasedObject(const gd::EventsBasedObject &_eventBasedObject)
         : AbstractEventsBasedEntity(_eventBasedObject) {
   // TODO Add a copy constructor in ObjectsContainer.
@@ -27,17 +27,26 @@ EventsBasedObject::EventsBasedObject(const gd::EventsBasedObject &_eventBasedObj
 
 void EventsBasedObject::SerializeTo(SerializerElement& element) const {
   element.SetAttribute("defaultName", defaultName);
+  if (isRenderedIn3D) {
+    element.SetBoolAttribute("is3D", true);
+  }
 
   AbstractEventsBasedEntity::SerializeTo(element);
   SerializeObjectsTo(element.AddChild("objects"));
+  SerializeFoldersTo(element.AddChild("objectsFolderStructure"));
 }
 
 void EventsBasedObject::UnserializeFrom(gd::Project& project,
-                                          const SerializerElement& element) {
+                                        const SerializerElement& element) {
   defaultName = element.GetStringAttribute("defaultName");
+  isRenderedIn3D = element.GetBoolAttribute("is3D", false);
 
   AbstractEventsBasedEntity::UnserializeFrom(project, element);
   UnserializeObjectsFrom(project, element.GetChild("objects"));
+  if (element.HasChild("objectsFolderStructure")) {
+    UnserializeFoldersFrom(project, element.GetChild("objectsFolderStructure", 0));
+  }
+  AddMissingObjectsInRootFolder();
 }
 
 }  // namespace gd

Core/GDCore/Project/EventsBasedObject.h

@@ -72,6 +72,19 @@ class GD_CORE_API EventsBasedObject: public AbstractEventsBasedEntity, public Ob
     return *this;
   }
 
+  /**
+   * \brief Declare a usage of the 3D renderer.
+   */
+  EventsBasedObject& MarkAsRenderedIn3D(bool isRenderedIn3D_) {
+    isRenderedIn3D = isRenderedIn3D_;
+    return *this;
+  }
+
+  /**
+   * \brief Return true if the object uses the 3D renderer.
+   */
+  bool IsRenderedIn3D() const { return isRenderedIn3D; }
+
   void SerializeTo(SerializerElement& element) const override;
 
   void UnserializeFrom(gd::Project& project,
@@ -79,6 +92,7 @@ class GD_CORE_API EventsBasedObject: public AbstractEventsBasedEntity, public Ob
 
  private:
   gd::String defaultName;
+  bool isRenderedIn3D;
 };
 
 }  // namespace gd

Core/GDCore/Project/Layer.cpp

@@ -19,7 +19,7 @@ Layer::Layer()
       isLocked(false),
       isLightingLayer(false),
       followBaseLayerCamera(false),
-      camera3DNearPlaneDistance(0.1),
+      camera3DNearPlaneDistance(3),
       camera3DFarPlaneDistance(10000),
       camera3DFieldOfView(45),
       ambientLightColorR(200),
@@ -39,6 +39,7 @@ void Layer::SetCameraCount(std::size_t n) {
 void Layer::SerializeTo(SerializerElement& element) const {
   element.SetAttribute("name", GetName());
   element.SetAttribute("renderingType", GetRenderingType());
+  element.SetAttribute("cameraType", GetCameraType());
   element.SetAttribute("visibility", GetVisibility());
   element.SetAttribute("isLocked", IsLocked());
   element.SetAttribute("isLightingLayer", IsLightingLayer());
@@ -78,6 +79,7 @@ void Layer::SerializeTo(SerializerElement& element) const {
 void Layer::UnserializeFrom(const SerializerElement& element) {
   SetName(element.GetStringAttribute("name", "", "Name"));
   SetRenderingType(element.GetStringAttribute("renderingType", ""));
+  SetCameraType(element.GetStringAttribute("cameraType", "perspective"));
   SetVisibility(element.GetBoolAttribute("visibility", true, "Visibility"));
   SetLocked(element.GetBoolAttribute("isLocked", false));
   SetLightingLayer(element.GetBoolAttribute("isLightingLayer", false));

Core/GDCore/Project/Layer.h

@@ -104,10 +104,17 @@ class GD_CORE_API Layer {
   const gd::String& GetName() const { return name; }
 
   const gd::String& GetRenderingType() const { return renderingType; }
+
   void SetRenderingType(const gd::String& renderingType_) {
     renderingType = renderingType_;
   }
 
+  const gd::String& GetCameraType() const { return cameraType; }
+
+  void SetCameraType(const gd::String& cameraType_) {
+    cameraType = cameraType_;
+  }
+
   /**
    * \brief Change if layer is displayed or not
    */
@@ -268,6 +275,7 @@ class GD_CORE_API Layer {
   gd::String name;           ///< The name of the layer
   gd::String renderingType;  ///< The rendering type: "" (empty), "2d", "3d" or
                              ///< "2d+3d".
+  gd::String cameraType;
   bool isVisible;            ///< True if the layer is visible
   bool isLocked;             ///< True if the layer is locked
   bool isLightingLayer;  ///< True if the layer is used to display lights and

Core/GDCore/Project/Layout.cpp

@@ -294,6 +294,7 @@ void Layout::SerializeTo(SerializerElement& element) const {
   GetVariables().SerializeTo(element.AddChild("variables"));
   GetInitialInstances().SerializeTo(element.AddChild("instances"));
   SerializeObjectsTo(element.AddChild("objects"));
+  SerializeFoldersTo(element.AddChild("objectsFolderStructure"));
   gd::EventsListSerialization::SerializeEventsTo(events,
                                                  element.AddChild("events"));
 
@@ -353,6 +354,11 @@ void Layout::UnserializeFrom(gd::Project& project,
       project, GetEvents(), element.GetChild("events", 0, "Events"));
 
   UnserializeObjectsFrom(project, element.GetChild("objects", 0, "Objets"));
+  if (element.HasChild("objectsFolderStructure")) {
+    UnserializeFoldersFrom(project, element.GetChild("objectsFolderStructure", 0));
+  }
+  AddMissingObjectsInRootFolder();
+
   initialInstances.UnserializeFrom(
       element.GetChild("instances", 0, "Positions"));
   variables.UnserializeFrom(element.GetChild("variables", 0, "Variables"));
@@ -444,13 +450,15 @@ gd::String GD_CORE_API GetTypeOfObject(const gd::ObjectsContainer& project,
                                        bool searchInGroups) {
   gd::String type;
 
-  // Search in objects
+  // Search in objects.
   if (layout.HasObjectNamed(name))
     type = layout.GetObject(name).GetType();
   else if (project.HasObjectNamed(name))
     type = project.GetObject(name).GetType();
 
-  // Search in groups
+  // Search in groups.
+  // Currently, a group is considered as the "intersection" of all of its objects.
+  // Search "groups is the intersection of its objects" in the codebase.
   else if (searchInGroups) {
     for (std::size_t i = 0; i < layout.GetObjectGroups().size(); ++i) {
       if (layout.GetObjectGroups()[i].GetName() == name) {
@@ -523,7 +531,7 @@ std::vector<gd::String> GD_CORE_API GetBehaviorNamesInObjectOrGroup(
     const gd::ObjectsContainer &project, const gd::ObjectsContainer &layout,
     const gd::String &objectOrGroupName, const gd::String &behaviorType,
     bool searchInGroups) {
-  // Search in objects
+  // Search in objects.
   if (layout.HasObjectNamed(objectOrGroupName)) {
     auto &object = layout.GetObject(objectOrGroupName);
     auto behaviorNames = object.GetAllBehaviorNames();
@@ -542,7 +550,9 @@ std::vector<gd::String> GD_CORE_API GetBehaviorNamesInObjectOrGroup(
     return behaviorNames;
   }
 
-  // Search in groups
+  // Search in groups.
+  // Currently, a group is considered as the "intersection" of all of its objects.
+  // Search "groups is the intersection of its objects" in the codebase.
   const gd::ObjectsContainer *container;
   if (layout.GetObjectGroups().Has(objectOrGroupName)) {
     container = &layout;
@@ -554,12 +564,14 @@ std::vector<gd::String> GD_CORE_API GetBehaviorNamesInObjectOrGroup(
   }
   const vector<gd::String> &groupsObjects =
       container->GetObjectGroups().Get(objectOrGroupName).GetAllObjectsNames();
+
   // Empty groups don't contain any behavior.
   if (groupsObjects.empty()) {
     std::vector<gd::String> behaviorNames;
     return behaviorNames;
   }
 
+  // Compute the intersection of the behaviors of all objects.
   auto behaviorNames = GetBehaviorNamesInObjectOrGroup(
       project, layout, groupsObjects[0], behaviorType, false);
   for (size_t i = 1; i < groupsObjects.size(); i++) {
@@ -587,7 +599,7 @@ bool GD_CORE_API HasBehaviorInObjectOrGroup(const gd::ObjectsContainer &project,
                                             const gd::String &objectOrGroupName,
                                             const gd::String &behaviorName,
                                             bool searchInGroups) {
-  // Search in objects
+  // Search in objects.
   if (layout.HasObjectNamed(objectOrGroupName)) {
     return layout.GetObject(objectOrGroupName).HasBehaviorNamed(behaviorName);
   }
@@ -599,7 +611,9 @@ bool GD_CORE_API HasBehaviorInObjectOrGroup(const gd::ObjectsContainer &project,
     return false;
   }
 
-  // Search in groups
+  // Search in groups.
+  // Currently, a group is considered as the "intersection" of all of its objects.
+  // Search "groups is the intersection of its objects" in the codebase.
   const gd::ObjectsContainer *container;
   if (layout.GetObjectGroups().Has(objectOrGroupName)) {
     container = &layout;
@@ -610,10 +624,12 @@ bool GD_CORE_API HasBehaviorInObjectOrGroup(const gd::ObjectsContainer &project,
   }
   const vector<gd::String> &groupsObjects =
       container->GetObjectGroups().Get(objectOrGroupName).GetAllObjectsNames();
+
   // Empty groups don't contain any behavior.
   if (groupsObjects.empty()) {
     return false;
   }
+
   // Check that all objects have the behavior.
   for (auto &&object : groupsObjects) {
     if (!HasBehaviorInObjectOrGroup(project, layout, object, behaviorName,
@@ -629,7 +645,7 @@ bool GD_CORE_API IsDefaultBehavior(const gd::ObjectsContainer& project,
                                          gd::String objectOrGroupName,
                                          gd::String behaviorName,
                                          bool searchInGroups) {
-  // Search in objects
+  // Search in objects.
   if (layout.HasObjectNamed(objectOrGroupName)) {
     auto &object = layout.GetObject(objectOrGroupName);
     return object.HasBehaviorNamed(behaviorName) &&
@@ -645,7 +661,9 @@ bool GD_CORE_API IsDefaultBehavior(const gd::ObjectsContainer& project,
     return false;
   }
 
-  // Search in groups
+  // Search in groups.
+  // Currently, a group is considered as the "intersection" of all of its objects.
+  // Search "groups is the intersection of its objects" in the codebase.
   const gd::ObjectsContainer *container;
   if (layout.GetObjectGroups().Has(objectOrGroupName)) {
     container = &layout;
@@ -656,10 +674,12 @@ bool GD_CORE_API IsDefaultBehavior(const gd::ObjectsContainer& project,
   }
   const vector<gd::String> &groupsObjects =
       container->GetObjectGroups().Get(objectOrGroupName).GetAllObjectsNames();
+
   // Empty groups don't contain any behavior.
   if (groupsObjects.empty()) {
     return false;
   }
+
   // Check that all objects have the same type.
   for (auto &&object : groupsObjects) {
     if (!IsDefaultBehavior(project, layout, object, behaviorName,
@@ -675,7 +695,7 @@ gd::String GD_CORE_API GetTypeOfBehaviorInObjectOrGroup(const gd::ObjectsContain
                                          const gd::String& objectOrGroupName,
                                          const gd::String& behaviorName,
                                          bool searchInGroups) {
-  // Search in objects
+  // Search in objects.
   if (layout.HasObjectNamed(objectOrGroupName)) {
     auto &object = layout.GetObject(objectOrGroupName);
     return object.HasBehaviorNamed(behaviorName) ?
@@ -691,7 +711,9 @@ gd::String GD_CORE_API GetTypeOfBehaviorInObjectOrGroup(const gd::ObjectsContain
     return "";
   }
 
-  // Search in groups
+  // Search in groups.
+  // Currently, a group is considered as the "intersection" of all of its objects.
+  // Search "groups is the intersection of its objects" in the codebase.
   const gd::ObjectsContainer *container;
   if (layout.GetObjectGroups().Has(objectOrGroupName)) {
     container = &layout;
@@ -702,10 +724,12 @@ gd::String GD_CORE_API GetTypeOfBehaviorInObjectOrGroup(const gd::ObjectsContain
   }
   const vector<gd::String> &groupsObjects =
       container->GetObjectGroups().Get(objectOrGroupName).GetAllObjectsNames();
+
   // Empty groups don't contain any behavior.
   if (groupsObjects.empty()) {
     return "";
   }
+
   // Check that all objects have the behavior with the same type.
   auto behaviorType = GetTypeOfBehaviorInObjectOrGroup(
       project, layout, groupsObjects[0], behaviorName, false);
@@ -767,6 +791,8 @@ GetBehaviorsOfObject(const gd::ObjectsContainer& project,
   }
 
   // Search in groups
+  // Currently, a group is considered as the "intersection" of all of its objects.
+  // Search "groups is the intersection of its objects" in the codebase.
   if (searchInGroups) {
     for (std::size_t i = 0; i < layout.GetObjectGroups().size(); ++i) {
       if (layout.GetObjectGroups()[i].GetName() == name) {

Core/GDCore/Project/LoadingScreen.cpp

@@ -17,7 +17,7 @@ LoadingScreen::LoadingScreen()
       backgroundFadeInDuration(0.2),
       minDuration(1.5),
       logoAndProgressFadeInDuration(0.2),
-      logoAndProgressLogoFadeInDelay(0.2),
+      logoAndProgressLogoFadeInDelay(0),
       showProgressBar(true),
       progressBarMinWidth(40),
       progressBarMaxWidth(200),

Core/GDCore/Project/Object.cpp

@@ -40,7 +40,6 @@ void Object::Init(const gd::Object& object) {
   name = object.name;
   assetStoreId = object.assetStoreId;
   objectVariables = object.objectVariables;
-  tags = object.tags;
   effectsContainer = object.effectsContainer;
 
   behaviors.clear();
@@ -134,7 +133,6 @@ void Object::UnserializeFrom(gd::Project& project,
   SetType(element.GetStringAttribute("type"));
   assetStoreId = element.GetStringAttribute("assetStoreId");
   name = element.GetStringAttribute("name", name, "nom");
-  tags = element.GetStringAttribute("tags");
 
   objectVariables.UnserializeFrom(
       element.GetChild("variables", 0, "Variables"));
@@ -207,7 +205,6 @@ void Object::SerializeTo(SerializerElement& element) const {
   element.SetAttribute("name", GetName());
   element.SetAttribute("assetStoreId", GetAssetStoreId());
   element.SetAttribute("type", GetType());
-  element.SetAttribute("tags", GetTags());
   objectVariables.SerializeTo(element.AddChild("variables"));
   effectsContainer.SerializeTo(element.AddChild("effects"));
 

Core/GDCore/Project/Object.h

@@ -120,14 +120,6 @@ class GD_CORE_API Object {
    */
   const gd::String& GetType() const { return configuration->GetType(); }
 
-  /** \brief Change the tags of the object.
-   */
-  void SetTags(const gd::String& tags_) { tags = tags_; }
-
-  /** \brief Return the tags of the object.
-   */
-  const gd::String& GetTags() const { return tags; }
-
   /** \brief Shortcut to check if the object is a 3D object.
    */
   bool Is3DObject() const { return configuration->Is3DObject(); }
@@ -268,7 +260,6 @@ class GD_CORE_API Object {
                   ///< object.
   gd::VariablesContainer
       objectVariables;  ///< List of the variables of the object
-  gd::String tags;      ///< Comma-separated list of tags
   gd::EffectsContainer
       effectsContainer;  ///< The effects container for the object.
   mutable gd::String persistentUuid;  ///< A persistent random version 4 UUID,

Core/GDCore/Project/ObjectFolderOrObject.cpp

@@ -0,0 +1,248 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2023 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "GDCore/Project/ObjectFolderOrObject.h"
+
+#include <memory>
+
+#include "GDCore/Project/Object.h"
+#include "GDCore/Project/ObjectsContainer.h"
+#include "GDCore/Serialization/SerializerElement.h"
+#include "GDCore/Tools/Log.h"
+
+using namespace std;
+
+namespace gd {
+
+ObjectFolderOrObject ObjectFolderOrObject::badObjectFolderOrObject;
+
+ObjectFolderOrObject::ObjectFolderOrObject()
+    : folderName("__NULL"), object(nullptr) {}
+ObjectFolderOrObject::ObjectFolderOrObject(gd::String folderName_,
+                                           ObjectFolderOrObject* parent_)
+    : folderName(folderName_), parent(parent_), object(nullptr) {}
+ObjectFolderOrObject::ObjectFolderOrObject(gd::Object* object_,
+                                           ObjectFolderOrObject* parent_)
+    : object(object_), parent(parent_) {}
+ObjectFolderOrObject::~ObjectFolderOrObject() {}
+
+bool ObjectFolderOrObject::HasObjectNamed(const gd::String& name) {
+  if (IsFolder()) {
+    return std::any_of(
+        children.begin(),
+        children.end(),
+        [&name](
+            std::unique_ptr<gd::ObjectFolderOrObject>& objectFolderOrObject) {
+          return objectFolderOrObject->HasObjectNamed(name);
+        });
+  }
+  if (!object) return false;
+  return object->GetName() == name;
+}
+ObjectFolderOrObject& ObjectFolderOrObject::GetObjectNamed(
+    const gd::String& name) {
+  if (object && object->GetName() == name) {
+    return *this;
+  }
+  if (IsFolder()) {
+    for (std::size_t j = 0; j < children.size(); j++) {
+      ObjectFolderOrObject& foundInChild = children[j]->GetObjectNamed(name);
+      if (&(foundInChild) != &badObjectFolderOrObject) {
+        return foundInChild;
+      }
+    }
+  }
+  return badObjectFolderOrObject;
+}
+
+void ObjectFolderOrObject::SetFolderName(const gd::String& name) {
+  if (!IsFolder()) return;
+  folderName = name;
+}
+
+ObjectFolderOrObject& ObjectFolderOrObject::GetChildAt(std::size_t index) {
+  if (index >= children.size()) return badObjectFolderOrObject;
+  return *children[index];
+}
+const ObjectFolderOrObject& ObjectFolderOrObject::GetChildAt(std::size_t index) const {
+  if (index >= children.size()) return badObjectFolderOrObject;
+  return *children[index];
+}
+ObjectFolderOrObject& ObjectFolderOrObject::GetObjectChild(
+    const gd::String& name) {
+  for (std::size_t j = 0; j < children.size(); j++) {
+    if (!children[j]->IsFolder()) {
+      if (children[j]->GetObject().GetName() == name) return *children[j];
+    };
+  }
+  return badObjectFolderOrObject;
+}
+
+void ObjectFolderOrObject::InsertObject(gd::Object* insertedObject,
+                                        std::size_t position) {
+  auto objectFolderOrObject =
+      gd::make_unique<ObjectFolderOrObject>(insertedObject, this);
+  if (position < children.size()) {
+    children.insert(children.begin() + position,
+                    std::move(objectFolderOrObject));
+  } else {
+    children.push_back(std::move(objectFolderOrObject));
+  }
+}
+
+std::size_t ObjectFolderOrObject::GetChildPosition(
+    const ObjectFolderOrObject& child) const {
+  for (std::size_t j = 0; j < children.size(); j++) {
+    if (children[j].get() == &child) return j;
+  }
+  return gd::String::npos;
+}
+
+ObjectFolderOrObject& ObjectFolderOrObject::InsertNewFolder(
+    const gd::String& newFolderName, std::size_t position) {
+  auto newFolderPtr =
+      gd::make_unique<ObjectFolderOrObject>(newFolderName, this);
+  gd::ObjectFolderOrObject& newFolder = *(*(children.insert(
+      position < children.size() ? children.begin() + position : children.end(),
+      std::move(newFolderPtr))));
+  return newFolder;
+};
+
+void ObjectFolderOrObject::RemoveRecursivelyObjectNamed(
+    const gd::String& name) {
+  if (IsFolder()) {
+    children.erase(
+        std::remove_if(children.begin(),
+                       children.end(),
+                       [&name](std::unique_ptr<gd::ObjectFolderOrObject>&
+                                   objectFolderOrObject) {
+                         return !objectFolderOrObject->IsFolder() &&
+                                objectFolderOrObject->GetObject().GetName() ==
+                                    name;
+                       }),
+        children.end());
+    for (auto& it : children) {
+      it->RemoveRecursivelyObjectNamed(name);
+    }
+  }
+};
+
+bool ObjectFolderOrObject::IsADescendantOf(
+    const ObjectFolderOrObject& otherObjectFolderOrObject) {
+  if (parent == nullptr) return false;
+  if (&(*parent) == &otherObjectFolderOrObject) return true;
+  return parent->IsADescendantOf(otherObjectFolderOrObject);
+}
+
+void ObjectFolderOrObject::MoveChild(std::size_t oldIndex,
+                                     std::size_t newIndex) {
+  if (!IsFolder()) return;
+  if (oldIndex >= children.size() || newIndex >= children.size()) return;
+
+  std::unique_ptr<gd::ObjectFolderOrObject> objectFolderOrObject =
+      std::move(children[oldIndex]);
+  children.erase(children.begin() + oldIndex);
+  children.insert(children.begin() + newIndex, std::move(objectFolderOrObject));
+}
+
+void ObjectFolderOrObject::RemoveFolderChild(
+    const ObjectFolderOrObject& childToRemove) {
+  if (!IsFolder() || !childToRemove.IsFolder() ||
+      childToRemove.GetChildrenCount() > 0) {
+    return;
+  }
+  std::vector<std::unique_ptr<gd::ObjectFolderOrObject>>::iterator it = find_if(
+      children.begin(),
+      children.end(),
+      [&childToRemove](std::unique_ptr<gd::ObjectFolderOrObject>& child) {
+        return child.get() == &childToRemove;
+      });
+  if (it == children.end()) return;
+
+  children.erase(it);
+}
+
+void ObjectFolderOrObject::MoveObjectFolderOrObjectToAnotherFolder(
+    gd::ObjectFolderOrObject& objectFolderOrObject,
+    gd::ObjectFolderOrObject& newParentFolder,
+    std::size_t newPosition) {
+  if (!newParentFolder.IsFolder()) return;
+  if (newParentFolder.IsADescendantOf(objectFolderOrObject)) return;
+
+  std::vector<std::unique_ptr<gd::ObjectFolderOrObject>>::iterator it =
+      find_if(children.begin(),
+              children.end(),
+              [&objectFolderOrObject](std::unique_ptr<gd::ObjectFolderOrObject>&
+                                          childObjectFolderOrObject) {
+                return childObjectFolderOrObject.get() == &objectFolderOrObject;
+              });
+  if (it == children.end()) return;
+
+  std::unique_ptr<gd::ObjectFolderOrObject> objectFolderOrObjectPtr =
+      std::move(*it);
+  children.erase(it);
+
+  objectFolderOrObjectPtr->parent = &newParentFolder;
+  newParentFolder.children.insert(
+      newPosition < newParentFolder.children.size()
+          ? newParentFolder.children.begin() + newPosition
+          : newParentFolder.children.end(),
+      std::move(objectFolderOrObjectPtr));
+}
+
+void ObjectFolderOrObject::SerializeTo(SerializerElement& element) const {
+  if (IsFolder()) {
+    element.SetAttribute("folderName", GetFolderName());
+    if (children.size() > 0) {
+      SerializerElement& childrenElement = element.AddChild("children");
+      childrenElement.ConsiderAsArrayOf("objectFolderOrObject");
+      for (std::size_t j = 0; j < children.size(); j++) {
+        children[j]->SerializeTo(
+            childrenElement.AddChild("objectFolderOrObject"));
+      }
+    }
+  } else {
+    element.SetAttribute("objectName", GetObject().GetName());
+  }
+}
+
+void ObjectFolderOrObject::UnserializeFrom(
+    gd::Project& project,
+    const SerializerElement& element,
+    gd::ObjectsContainer& objectsContainer) {
+  children.clear();
+  gd::String potentialFolderName = element.GetStringAttribute("folderName", "");
+
+  if (!potentialFolderName.empty()) {
+    object = nullptr;
+    folderName = potentialFolderName;
+
+    if (element.HasChild("children")) {
+      const SerializerElement& childrenElements =
+          element.GetChild("children", 0);
+      childrenElements.ConsiderAsArrayOf("objectFolderOrObject");
+      for (std::size_t i = 0; i < childrenElements.GetChildrenCount(); ++i) {
+        std::unique_ptr<ObjectFolderOrObject> childObjectFolderOrObject =
+            make_unique<ObjectFolderOrObject>();
+        childObjectFolderOrObject->UnserializeFrom(
+            project, childrenElements.GetChild(i), objectsContainer);
+        childObjectFolderOrObject->parent = this;
+        children.push_back(std::move(childObjectFolderOrObject));
+      }
+    }
+  } else {
+    folderName = "";
+    gd::String objectName = element.GetStringAttribute("objectName");
+    if (objectsContainer.HasObjectNamed(objectName)) {
+      object = &objectsContainer.GetObject(objectName);
+    } else {
+      gd::LogError("Object with name " + objectName +
+                   " not found in objects container.");
+      object = nullptr;
+    }
+  }
+};
+
+}  // namespace gd

Core/GDCore/Project/ObjectFolderOrObject.h

@@ -0,0 +1,203 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2023 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#ifndef GDCORE_OBJECTFOLDEROROBJECT_H
+#define GDCORE_OBJECTFOLDEROROBJECT_H
+#include <memory>
+#include <vector>
+
+#include "GDCore/Serialization/SerializerElement.h"
+#include "GDCore/String.h"
+
+namespace gd {
+class Project;
+class Object;
+class SerializerElement;
+class ObjectsContainer;
+}  // namespace gd
+
+namespace gd {
+
+/**
+ * \brief Class representing a folder structure in order to organize objects
+ * in folders (to be used with an ObjectsContainer.)
+ *
+ * \see gd::ObjectsContainer
+ */
+class GD_CORE_API ObjectFolderOrObject {
+ public:
+  /**
+   * \brief Default constructor creating an empty instance. Useful for the null
+   * object pattern.
+   */
+  ObjectFolderOrObject();
+  virtual ~ObjectFolderOrObject();
+  /**
+   * \brief Constructor for creating an instance representing a folder.
+   */
+  ObjectFolderOrObject(gd::String folderName_,
+                       ObjectFolderOrObject* parent_ = nullptr);
+  /**
+   * \brief Constructor for creating an instance representing an object.
+   */
+  ObjectFolderOrObject(gd::Object* object_,
+                       ObjectFolderOrObject* parent_ = nullptr);
+
+  /**
+   * \brief Returns the object behind the instance.
+   */
+  gd::Object& GetObject() const { return *object; }
+
+  /**
+   * \brief Returns true if the instance represents a folder.
+   */
+  bool IsFolder() const { return !folderName.empty(); }
+  /**
+   * \brief Returns the name of the folder.
+   */
+  const gd::String& GetFolderName() const { return folderName; }
+
+  /**
+   * \brief Set the folder name. Does nothing if called on an instance not
+   * representing a folder.
+   */
+  void SetFolderName(const gd::String& name);
+
+  /**
+   * \brief Returns true if the instance represents the object with the given
+   * name or if any of the children does (recursive search).
+   */
+  bool HasObjectNamed(const gd::String& name);
+  /**
+   * \brief Returns the child instance holding the object with the given name
+   * (recursive search).
+   */
+  ObjectFolderOrObject& GetObjectNamed(const gd::String& name);
+
+  /**
+   * \brief Returns the number of children. Returns 0 if the instance represents
+   * an object.
+   */
+  std::size_t GetChildrenCount() const {
+    if (IsFolder()) return children.size();
+    return 0;
+  }
+  /**
+   * \brief Returns the child ObjectFolderOrObject at the given index.
+   */
+  ObjectFolderOrObject& GetChildAt(std::size_t index);
+  /**
+   * \brief Returns the child ObjectFolderOrObject at the given index.
+   */
+  const ObjectFolderOrObject& GetChildAt(std::size_t index) const;
+  /**
+   * \brief Returns the child ObjectFolderOrObject that represents the object
+   * with the given name. To use only if sure that the instance holds the object
+   * in its direct children (no recursive search).
+   *
+   * \note The equivalent method to get a folder by its name cannot be
+   * implemented because there is no unicity enforced on the folder name.
+   */
+  ObjectFolderOrObject& GetObjectChild(const gd::String& name);
+
+  /**
+   * \brief Returns the parent of the instance. If the instance has no parent
+   * (root folder), the null object is returned.
+   */
+  ObjectFolderOrObject& GetParent() {
+    if (parent == nullptr) {
+      return badObjectFolderOrObject;
+    }
+    return *parent;
+  };
+
+  /**
+   * \brief Returns true if the instance is a root folder (that's to say it
+   * has no parent).
+   */
+  bool IsRootFolder() { return !object && !parent; }
+
+  /**
+   * \brief Moves a child from a position to a new one.
+   */
+  void MoveChild(std::size_t oldIndex, std::size_t newIndex);
+  /**
+   * \brief Removes the given child from the instance's children. If the given
+   * child contains children of its own, does nothing.
+   */
+  void RemoveFolderChild(const ObjectFolderOrObject& childToRemove);
+  /**
+   * \brief Removes the child representing the object with the given name from
+   * the instance children and recursively does it for every folder children.
+   */
+  void RemoveRecursivelyObjectNamed(const gd::String& name);
+
+  /**
+   * \brief Inserts an instance representing the given object at the given
+   * position.
+   */
+  void InsertObject(gd::Object* insertedObject,
+                    std::size_t position = (size_t)-1);
+  /**
+   * \brief Inserts an instance representing a folder with the given name at the
+   * given position.
+   */
+  ObjectFolderOrObject& InsertNewFolder(const gd::String& newFolderName,
+                                        std::size_t position);
+  /**
+   * \brief Returns true if the instance is a descendant of the given instance
+   * of ObjectFolderOrObject.
+   */
+  bool IsADescendantOf(const ObjectFolderOrObject& otherObjectFolderOrObject);
+
+  /**
+   * \brief Returns the position of the given instance of ObjectFolderOrObject
+   * in the instance's children.
+   */
+  std::size_t GetChildPosition(const ObjectFolderOrObject& child) const;
+  /**
+   * \brief Moves the given child ObjectFolderOrObject to the given folder at
+   * the given position.
+   */
+  void MoveObjectFolderOrObjectToAnotherFolder(
+      gd::ObjectFolderOrObject& objectFolderOrObject,
+      gd::ObjectFolderOrObject& newParentFolder,
+      std::size_t newPosition);
+
+  /** \name Saving and loading
+   * Members functions related to saving and loading the objects of the class.
+   */
+  ///@{
+  /**
+   * \brief Serialize the ObjectFolderOrObject instance.
+   */
+  void SerializeTo(SerializerElement& element) const;
+
+  /**
+   * \brief Unserialize the ObjectFolderOrObject instance.
+   */
+  void UnserializeFrom(gd::Project& project,
+                       const SerializerElement& element,
+                       ObjectsContainer& objectsContainer);
+  ///@}
+
+ private:
+  static gd::ObjectFolderOrObject badObjectFolderOrObject;
+
+  gd::ObjectFolderOrObject*
+      parent;  // nullptr if root folder, points to the parent folder otherwise.
+
+  // Representing an object:
+  gd::Object* object;  // nullptr if folderName is set.
+
+  // or representing a folder:
+  gd::String folderName;  // Empty if object is set.
+  std::vector<std::unique_ptr<ObjectFolderOrObject>>
+      children;  // Folder children.
+};
+
+}  // namespace gd
+
+#endif  // GDCORE_OBJECTFOLDEROROBJECT_H

Core/GDCore/Project/ObjectGroupsContainer.cpp

@@ -162,10 +162,12 @@ void ObjectGroupsContainer::Move(std::size_t oldIndex, std::size_t newIndex) {
   objectGroups.insert(objectGroups.begin() + newIndex, std::move(objectGroup));
 }
 
-void ObjectGroupsContainer::ForEachNameWithPrefix(const gd::String& prefix,
-                                                std::function<void(const gd::String& name)> fn) const {
-  for (const auto& objectGroup: objectGroups) {
-    if (objectGroup->GetName().find(prefix) == 0) fn(objectGroup->GetName());
+void ObjectGroupsContainer::ForEachNameMatchingSearch(
+    const gd::String& search,
+    std::function<void(const gd::String& name)> fn) const {
+  for (const auto& objectGroup : objectGroups) {
+    if (objectGroup->GetName().FindCaseInsensitive(search) != gd::String::npos)
+      fn(objectGroup->GetName());
   }
 }
 

Core/GDCore/Project/ObjectGroupsContainer.h

@@ -118,9 +118,9 @@ class GD_CORE_API ObjectGroupsContainer {
   inline void Clear() { objectGroups.clear(); }
 
   /**
-   * \brief Call the callback for each group name starting with the prefix passed in parameter.
+   * \brief Call the callback for each group name matching the specified search.
    */
-  void ForEachNameWithPrefix(const gd::String& prefix, std::function<void(const gd::String& name)> fn) const;
+  void ForEachNameMatchingSearch(const gd::String& search, std::function<void(const gd::String& name)> fn) const;
   ///@}
 
   /** \name Saving and loading

Core/GDCore/Project/ObjectsContainer.cpp

@@ -9,12 +9,15 @@
 
 #include "GDCore/Extensions/Platform.h"
 #include "GDCore/Project/Object.h"
+#include "GDCore/Project/ObjectFolderOrObject.h"
 #include "GDCore/Project/Project.h"
 #include "GDCore/Serialization/SerializerElement.h"
 
 namespace gd {
 
-ObjectsContainer::ObjectsContainer() {}
+ObjectsContainer::ObjectsContainer() {
+  rootFolder = gd::make_unique<gd::ObjectFolderOrObject>("__ROOT");
+}
 
 ObjectsContainer::~ObjectsContainer() {}
 
@@ -24,6 +27,22 @@ void ObjectsContainer::SerializeObjectsTo(SerializerElement& element) const {
     initialObjects[j]->SerializeTo(element.AddChild("object"));
   }
 }
+void ObjectsContainer::SerializeFoldersTo(SerializerElement& element) const {
+  rootFolder->SerializeTo(element);
+}
+
+void ObjectsContainer::UnserializeFoldersFrom(
+    gd::Project& project, const SerializerElement& element) {
+  rootFolder->UnserializeFrom(project, element, *this);
+}
+
+void ObjectsContainer::AddMissingObjectsInRootFolder() {
+  for (std::size_t i = 0; i < initialObjects.size(); ++i) {
+    if (!rootFolder->HasObjectNamed(initialObjects[i]->GetName())) {
+      rootFolder->InsertObject(&(*initialObjects[i]));
+    }
+  }
+}
 
 void ObjectsContainer::UnserializeObjectsFrom(
     gd::Project& project, const SerializerElement& element) {
@@ -48,17 +67,23 @@ void ObjectsContainer::UnserializeObjectsFrom(
 bool ObjectsContainer::HasObjectNamed(const gd::String& name) const {
   return (find_if(initialObjects.begin(),
                   initialObjects.end(),
-                  bind2nd(gd::ObjectHasName(), name)) != initialObjects.end());
+                  [&](const std::unique_ptr<gd::Object>& object) {
+                    return object->GetName() == name;
+                  }) != initialObjects.end());
 }
 gd::Object& ObjectsContainer::GetObject(const gd::String& name) {
   return *(*find_if(initialObjects.begin(),
                     initialObjects.end(),
-                    bind2nd(gd::ObjectHasName(), name)));
+                    [&](const std::unique_ptr<gd::Object>& object) {
+                      return object->GetName() == name;
+                    }));
 }
 const gd::Object& ObjectsContainer::GetObject(const gd::String& name) const {
   return *(*find_if(initialObjects.begin(),
                     initialObjects.end(),
-                    bind2nd(gd::ObjectHasName(), name)));
+                    [&](const std::unique_ptr<gd::Object>& object) {
+                      return object->GetName() == name;
+                    }));
 }
 gd::Object& ObjectsContainer::GetObject(std::size_t index) {
   return *initialObjects[index];
@@ -84,6 +109,22 @@ gd::Object& ObjectsContainer::InsertNewObject(const gd::Project& project,
                                        : initialObjects.end(),
       project.CreateObject(objectType, name))));
 
+  rootFolder->InsertObject(&newlyCreatedObject);
+
+  return newlyCreatedObject;
+}
+
+gd::Object& ObjectsContainer::InsertNewObjectInFolder(
+    const gd::Project& project,
+    const gd::String& objectType,
+    const gd::String& name,
+    gd::ObjectFolderOrObject& objectFolderOrObject,
+    std::size_t position) {
+  gd::Object& newlyCreatedObject = *(*(initialObjects.insert(
+      initialObjects.end(), project.CreateObject(objectType, name))));
+
+  objectFolderOrObject.InsertObject(&newlyCreatedObject, position);
+
   return newlyCreatedObject;
 }
 
@@ -97,16 +138,6 @@ gd::Object& ObjectsContainer::InsertObject(const gd::Object& object,
   return newlyCreatedObject;
 }
 
-void ObjectsContainer::SwapObjects(std::size_t firstObjectIndex,
-                                   std::size_t secondObjectIndex) {
-  if (firstObjectIndex >= initialObjects.size() ||
-      secondObjectIndex >= initialObjects.size())
-    return;
-
-  std::iter_swap(initialObjects.begin() + firstObjectIndex,
-                 initialObjects.begin() + secondObjectIndex);
-}
-
 void ObjectsContainer::MoveObject(std::size_t oldIndex, std::size_t newIndex) {
   if (oldIndex >= initialObjects.size() || newIndex >= initialObjects.size())
     return;
@@ -120,30 +151,59 @@ void ObjectsContainer::RemoveObject(const gd::String& name) {
   std::vector<std::unique_ptr<gd::Object>>::iterator objectIt =
       find_if(initialObjects.begin(),
               initialObjects.end(),
-              bind2nd(ObjectHasName(), name));
+              [&](const std::unique_ptr<gd::Object>& object) {
+                return object->GetName() == name;
+              });
   if (objectIt == initialObjects.end()) return;
 
+  rootFolder->RemoveRecursivelyObjectNamed(name);
+
   initialObjects.erase(objectIt);
 }
 
-void ObjectsContainer::MoveObjectToAnotherContainer(
-    const gd::String& name,
+void ObjectsContainer::MoveObjectFolderOrObjectToAnotherContainerInFolder(
+    gd::ObjectFolderOrObject& objectFolderOrObject,
     gd::ObjectsContainer& newContainer,
+    gd::ObjectFolderOrObject& newParentFolder,
     std::size_t newPosition) {
-  std::vector<std::unique_ptr<gd::Object>>::iterator objectIt =
-      find_if(initialObjects.begin(),
-              initialObjects.end(),
-              bind2nd(ObjectHasName(), name));
+  if (objectFolderOrObject.IsFolder() || !newParentFolder.IsFolder()) return;
+
+  std::vector<std::unique_ptr<gd::Object>>::iterator objectIt = find_if(
+      initialObjects.begin(),
+      initialObjects.end(),
+      [&objectFolderOrObject](std::unique_ptr<gd::Object>& object) {
+        return object->GetName() == objectFolderOrObject.GetObject().GetName();
+      });
   if (objectIt == initialObjects.end()) return;
 
   std::unique_ptr<gd::Object> object = std::move(*objectIt);
   initialObjects.erase(objectIt);
 
-  newContainer.initialObjects.insert(
-      newPosition < newContainer.initialObjects.size()
-          ? newContainer.initialObjects.begin() + newPosition
-          : newContainer.initialObjects.end(),
-      std::move(object));
+  newContainer.initialObjects.push_back(std::move(object));
+
+  objectFolderOrObject.GetParent().MoveObjectFolderOrObjectToAnotherFolder(
+      objectFolderOrObject, newParentFolder, newPosition);
+}
+
+std::vector<const ObjectFolderOrObject*>
+ObjectsContainer::GetAllObjectFolderOrObjects() const {
+  std::vector<const ObjectFolderOrObject*> results;
+
+  std::function<void(const ObjectFolderOrObject& folder)> addChildrenOfFolder =
+      [&](const ObjectFolderOrObject& folder) {
+        for (size_t i = 0; i < folder.GetChildrenCount(); ++i) {
+          const auto& child = folder.GetChildAt(i);
+          results.push_back(&child);
+
+          if (child.IsFolder()) {
+            addChildrenOfFolder(child);
+          }
+        }
+      };
+
+  addChildrenOfFolder(*rootFolder);
+
+  return results;
 }
 
 }  // namespace gd

Core/GDCore/Project/ObjectsContainer.h

@@ -9,11 +9,12 @@
 #include <vector>
 #include "GDCore/String.h"
 #include "GDCore/Project/ObjectGroupsContainer.h"
+#include "GDCore/Project/ObjectFolderOrObject.h"
 namespace gd {
 class Object;
 class Project;
 class SerializerElement;
-}
+}  // namespace gd
 #undef GetObject  // Disable an annoying macro
 
 namespace gd {
@@ -98,6 +99,19 @@ class GD_CORE_API ObjectsContainer {
                               const gd::String& objectType,
                               const gd::String& name,
                               std::size_t position);
+  /**
+   * \brief Add a new empty object of type \a objectType called \a name in the
+   * given folder at the specified position.<br>
+   *
+   * \note The object is created using the project's current platform.
+   * \return A reference to the object in the list.
+   */
+  gd::Object& InsertNewObjectInFolder(
+      const gd::Project& project,
+      const gd::String& objectType,
+      const gd::String& name,
+      gd::ObjectFolderOrObject& objectFolderOrObject,
+      std::size_t position);
 
   /**
    * \brief Add a new object to the list
@@ -125,18 +139,18 @@ class GD_CORE_API ObjectsContainer {
   void MoveObject(std::size_t oldIndex, std::size_t newIndex);
 
   /**
-   * \brief Swap the position of the specified objects.
-   */
-  void SwapObjects(std::size_t firstObjectIndex, std::size_t secondObjectIndex);
-
-  /**
-   * Move the specified object to another container, removing it from the current one
-   * and adding it to the new one at the specified position.
+   * Move the specified object to another container, removing it from the
+   * current one and adding it to the new one at the specified position in the
+   * given folder.
    *
-   * \note This does not invalidate the references to the object (object is not moved in memory,
-   * as referenced by smart pointers internally).
+   * \note This does not invalidate the references to the object (object is not
+   * moved in memory, as referenced by smart pointers internally).
    */
-  void MoveObjectToAnotherContainer(const gd::String& name, gd::ObjectsContainer & newContainer, std::size_t newPosition);
+  void MoveObjectFolderOrObjectToAnotherContainerInFolder(
+      gd::ObjectFolderOrObject& objectFolderOrObject,
+      gd::ObjectsContainer& newContainer,
+      gd::ObjectFolderOrObject& newParentFolder,
+      std::size_t newPosition);
 
   /**
    * Provide a raw access to the vector containing the objects
@@ -153,20 +167,43 @@ class GD_CORE_API ObjectsContainer {
   }
   ///@}
 
+  /**
+   * Returns a vector containing all object and folders in this container.
+   * Only use this for checking if you hold a valid `ObjectFolderOrObject` -
+   * don't use this for rendering or anything else.
+   */
+  std::vector<const ObjectFolderOrObject*> GetAllObjectFolderOrObjects() const;
+
+  gd::ObjectFolderOrObject& GetRootFolder() {
+      return *rootFolder;
+  }
+
+  void AddMissingObjectsInRootFolder();
+
   /** \name Saving and loading
    * Members functions related to saving and loading the objects of the class.
    */
   ///@{
   /**
-   * \brief Serialize instances container.
+   * \brief Serialize the objects container.
    */
   void SerializeObjectsTo(SerializerElement& element) const;
 
   /**
-   * \brief Unserialize the instances container.
+   * \brief Unserialize the objects container.
    */
   void UnserializeObjectsFrom(gd::Project& project,
                               const SerializerElement& element);
+  /**
+   * \brief Serialize folder structure.
+   */
+  void SerializeFoldersTo(SerializerElement& element) const;
+
+  /**
+   * \brief Unserialize folder structure.
+   */
+  void UnserializeFoldersFrom(gd::Project& project,
+                              const SerializerElement& element);
   ///@}
 
   /** \name Objects groups management
@@ -190,6 +227,9 @@ class GD_CORE_API ObjectsContainer {
   std::vector<std::unique_ptr<gd::Object> >
       initialObjects;  ///< Objects contained.
   gd::ObjectGroupsContainer objectGroups;
+
+ private:
+  std::unique_ptr<gd::ObjectFolderOrObject> rootFolder;
 };
 
 }  // namespace gd

Core/GDCore/Project/ObjectsContainersList.cpp

@@ -51,24 +51,69 @@ bool ObjectsContainersList::HasObjectNamed(const gd::String& name) const {
   return false;
 }
 
-bool ObjectsContainersList::HasObjectOrGroupWithVariableNamed(
+ObjectsContainersList::VariableExistence
+ObjectsContainersList::HasObjectOrGroupWithVariableNamed(
     const gd::String& objectOrGroupName, const gd::String& variableName) const {
   for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
        ++it) {
     if ((*it)->HasObjectNamed(objectOrGroupName)) {
       const auto& variables =
           (*it)->GetObject(objectOrGroupName).GetVariables();
-      return variables.Has(variableName);
+      return variables.Has(variableName) ? VariableExistence::Exists
+                                         : VariableExistence::DoesNotExist;
     }
     if ((*it)->GetObjectGroups().Has(objectOrGroupName)) {
-      // Could be adapted if objects groups have variables in the future.
+      // This could be adapted if objects groups have variables in the future.
+
+      // Currently, a group is considered as the "intersection" of all of its
+      // objects. Search "groups is the intersection of its objects" in the
+      // codebase. Consider that a group has a variable if all objects of the
+      // group have it:
+      const auto& objectGroup = (*it)->GetObjectGroups().Get(objectOrGroupName);
+      const auto& objectNames = objectGroup.GetAllObjectsNames();
+      if (objectNames.empty()) return VariableExistence::GroupIsEmpty;
+
+      bool existsOnAtLeastOneObject = false;
+      bool missingOnAtLeastOneObject = false;
+      for (const auto& objectName : objectNames) {
+        if (!HasObjectWithVariableNamed(objectName, variableName)) {
+          missingOnAtLeastOneObject = true;
+          if (existsOnAtLeastOneObject) {
+            return VariableExistence::ExistsOnlyOnSomeObjectsOfTheGroup;
+          }
+        } else {
+          existsOnAtLeastOneObject = true;
+          if (missingOnAtLeastOneObject) {
+            return VariableExistence::ExistsOnlyOnSomeObjectsOfTheGroup;
+          }
+        }
+      }
+
+      if (missingOnAtLeastOneObject) {
+        return VariableExistence::DoesNotExist;
+      }
+
+      return VariableExistence::Exists;
+    }
+  }
+
+  return VariableExistence::DoesNotExist;
+}
+
+bool ObjectsContainersList::HasObjectWithVariableNamed(
+    const gd::String& objectName, const gd::String& variableName) const {
+  for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
+       ++it) {
+    if ((*it)->HasObjectNamed(objectName)) {
+      const auto& variables = (*it)->GetObject(objectName).GetVariables();
+      return variables.Has(variableName);
     }
   }
 
   return false;
 }
 
-bool ObjectsContainersList::HasVariablesContainer(
+bool ObjectsContainersList::HasObjectOrGroupVariablesContainer(
     const gd::String& objectOrGroupName,
     const gd::VariablesContainer& variablesContainer) const {
   for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
@@ -78,7 +123,31 @@ bool ObjectsContainersList::HasVariablesContainer(
              &(*it)->GetObject(objectOrGroupName).GetVariables();
     }
     if ((*it)->GetObjectGroups().Has(objectOrGroupName)) {
-      // Could be adapted if objects groups have variables in the future.
+      // For groups, we consider that the first object of the group defines the
+      // variables available for this group. Note that this is slightly
+      // different than other methods where a group is considered as the
+      // "intersection" of all of its objects.
+      const auto& objectNames =
+          (*it)->GetObjectGroups().Get(objectOrGroupName).GetAllObjectsNames();
+
+      if (!objectNames.empty()) {
+        return HasObjectVariablesContainer(objectNames[0], variablesContainer);
+      }
+      return false;
+    }
+  }
+
+  return false;
+}
+
+bool ObjectsContainersList::HasObjectVariablesContainer(
+    const gd::String& objectName,
+    const gd::VariablesContainer& variablesContainer) const {
+  for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
+       ++it) {
+    if ((*it)->HasObjectNamed(objectName)) {
+      return &variablesContainer ==
+             &(*it)->GetObject(objectName).GetVariables();
     }
   }
 
@@ -94,26 +163,154 @@ ObjectsContainersList::GetObjectOrGroupVariablesContainer(
       return &(*it)->GetObject(objectOrGroupName).GetVariables();
     }
     if ((*it)->GetObjectGroups().Has(objectOrGroupName)) {
-      // Could be adapted if objects groups have variables in the future.
+      // For groups, we consider that the first object of the group defines the
+      // variables available for this group. Note that this is slightly
+      // different than other methods where a group is considered as the
+      // "intersection" of all of its objects.
+      const auto& objectNames =
+          (*it)->GetObjectGroups().Get(objectOrGroupName).GetAllObjectsNames();
+
+      if (!objectNames.empty()) {
+        return GetObjectVariablesContainer(objectNames[0]);
+      }
+      return nullptr;
     }
   }
 
   return nullptr;
 }
 
-void ObjectsContainersList::ForEachNameWithPrefix(
-    const gd::String& prefix,
+const gd::VariablesContainer*
+ObjectsContainersList::GetObjectVariablesContainer(
+    const gd::String& objectName) const {
+  for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
+       ++it) {
+    if ((*it)->HasObjectNamed(objectName)) {
+      return &(*it)->GetObject(objectName).GetVariables();
+    }
+  }
+
+  return nullptr;
+}
+
+gd::Variable::Type ObjectsContainersList::GetTypeOfObjectOrGroupVariable(
+    const gd::String& objectOrGroupName, const gd::String& variableName) const {
+  for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
+       ++it) {
+    if ((*it)->HasObjectNamed(objectOrGroupName)) {
+      const auto& variables =
+          (*it)->GetObject(objectOrGroupName).GetVariables();
+
+      return variables.Get(variableName).GetType();
+    }
+    if ((*it)->GetObjectGroups().Has(objectOrGroupName)) {
+      // This could be adapted if objects groups have variables in the future.
+
+      // Currently, a group is considered as the "intersection" of all of its
+      // objects. Search "groups is the intersection of its objects" in the
+      // codebase. Consider that the first object having the variable will
+      // define its type.
+      const auto& objectGroup = (*it)->GetObjectGroups().Get(objectOrGroupName);
+      const auto& objectNames = objectGroup.GetAllObjectsNames();
+
+      for (const auto& objectName : objectNames) {
+        if (HasObjectWithVariableNamed(objectName, variableName)) {
+          return GetTypeOfObjectVariable(objectName, variableName);
+        }
+      }
+
+      return Variable::Type::Number;
+    }
+  }
+
+  return Variable::Type::Number;
+}
+
+gd::Variable::Type ObjectsContainersList::GetTypeOfObjectVariable(
+    const gd::String& objectName, const gd::String& variableName) const {
+  for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
+       ++it) {
+    if ((*it)->HasObjectNamed(objectName)) {
+      const auto& variables = (*it)->GetObject(objectName).GetVariables();
+
+      return variables.Get(variableName).GetType();
+    }
+  }
+
+  return Variable::Type::Number;
+}
+
+void ObjectsContainersList::ForEachObjectOrGroupVariableMatchingSearch(
+    const gd::String& objectOrGroupName,
+    const gd::String& search,
+    std::function<void(const gd::String& variableName,
+                       const gd::Variable& variable)> fn) const {
+  for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
+       ++it) {
+    if ((*it)->HasObjectNamed(objectOrGroupName)) {
+      const auto& variables =
+          (*it)->GetObject(objectOrGroupName).GetVariables();
+      variables.ForEachVariableMatchingSearch(search, fn);
+    }
+    if ((*it)->GetObjectGroups().Has(objectOrGroupName)) {
+      // This could be adapted if objects groups have variables in the future.
+
+      // Currently, a group is considered as the "intersection" of all of its
+      // objects. Search "groups is the intersection of its objects" in the
+      // codebase. Consider that a group has a variable if all objects of the
+      // group have it:
+      const auto& objectGroup = (*it)->GetObjectGroups().Get(objectOrGroupName);
+      const auto& objectNames = objectGroup.GetAllObjectsNames();
+
+      if (objectNames.empty()) return;
+      const auto& firstObjectName = objectNames.front();
+      ForEachObjectVariableMatchingSearch(
+          firstObjectName,
+          search,
+          [&](const gd::String& variableName, const gd::Variable& variable) {
+            for (const auto& objectName : objectGroup.GetAllObjectsNames()) {
+              if (!HasObjectWithVariableNamed(objectName, variableName)) {
+                return;  // This variable is not shared by all objects of the
+                         // group.
+              }
+            }
+
+            // This variable is shared by all objects in the group. Note that
+            // other objects can have it with a different type - we allow this.
+            fn(variableName, variable);
+          });
+    }
+  }
+}
+
+void ObjectsContainersList::ForEachObjectVariableMatchingSearch(
+    const gd::String& objectOrGroupName,
+    const gd::String& search,
+    std::function<void(const gd::String& variableName,
+                       const gd::Variable& variable)> fn) const {
+  for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
+       ++it) {
+    if ((*it)->HasObjectNamed(objectOrGroupName)) {
+      const auto& variables =
+          (*it)->GetObject(objectOrGroupName).GetVariables();
+      variables.ForEachVariableMatchingSearch(search, fn);
+    }
+  }
+}
+
+void ObjectsContainersList::ForEachNameMatchingSearch(
+    const gd::String& search,
     std::function<void(const gd::String& name,
                        const gd::ObjectConfiguration* objectConfiguration)> fn)
     const {
   for (auto it = objectsContainers.rbegin(); it != objectsContainers.rend();
        ++it) {
     for (const auto& object : (*it)->GetObjects()) {
-      if (object->GetName().find(prefix) == 0)
+      if (object->GetName().FindCaseInsensitive(search) != gd::String::npos)
         fn(object->GetName(), &object->GetConfiguration());
     }
-    (*it)->GetObjectGroups().ForEachNameWithPrefix(
-        prefix, [&](const gd::String& name) { fn(name, nullptr); });
+    (*it)->GetObjectGroups().ForEachNameMatchingSearch(
+        search, [&](const gd::String& name) { fn(name, nullptr); });
   }
 }
 
@@ -229,8 +426,10 @@ gd::String ObjectsContainersList::GetTypeOfBehavior(
         "ObjectsContainersList::GetTypeOfObject called with objectsContainers "
         "not being exactly 2. This is a logical error and will crash.");
   }
-  return gd::GetTypeOfBehavior(
-      *objectsContainers[0], *objectsContainers[1], behaviorName, searchInGroups);
+  return gd::GetTypeOfBehavior(*objectsContainers[0],
+                               *objectsContainers[1],
+                               behaviorName,
+                               searchInGroups);
 }
 
 std::vector<gd::String> ObjectsContainersList::GetBehaviorsOfObject(

Core/GDCore/Project/ObjectsContainersList.h

@@ -42,18 +42,26 @@ class GD_CORE_API ObjectsContainersList {
    */
   bool HasObjectOrGroupNamed(const gd::String& name) const;
 
+  enum VariableExistence {
+    DoesNotExist,
+    Exists,
+    GroupIsEmpty,
+    ExistsOnlyOnSomeObjectsOfTheGroup
+  };
+
   /**
    * \brief Check if the specified object or group has the specified variable in
    * its declared variables.
    */
-  bool HasObjectOrGroupWithVariableNamed(const gd::String& objectOrGroupName,
-                                         const gd::String& variableName) const;
+  VariableExistence HasObjectOrGroupWithVariableNamed(
+      const gd::String& objectOrGroupName,
+      const gd::String& variableName) const;
 
   /**
    * \brief Check if the specified object or group has the specified variables
    * container.
    */
-  bool HasVariablesContainer(
+  bool HasObjectOrGroupVariablesContainer(
       const gd::String& objectOrGroupName,
       const gd::VariablesContainer& variablesContainer) const;
 
@@ -64,6 +72,11 @@ class GD_CORE_API ObjectsContainersList {
   const gd::VariablesContainer* GetObjectOrGroupVariablesContainer(
       const gd::String& objectOrGroupName) const;
 
+  /**
+   * \brief Get a type from an object/group variable.
+   */
+  gd::Variable::Type GetTypeOfObjectOrGroupVariable(const gd::String& objectOrGroupName, const gd::String& variableName) const;
+
   /**
    * \brief Get a type from an object/group name.
    * \note If a group contains only objects of a same type, then the group has
@@ -81,18 +94,21 @@ class GD_CORE_API ObjectsContainersList {
                                   const gd::String& behaviorName) const;
 
   /**
-    * \brief Get the type of a behavior if an object or all objects of a group has it.
-    */
-  gd::String GetTypeOfBehaviorInObjectOrGroup(const gd::String &objectOrGroupName,
-                                              const gd::String &behaviorName,
-                                              bool searchInGroups = true) const;
+   * \brief Get the type of a behavior if an object or all objects of a group
+   * has it.
+   */
+  gd::String GetTypeOfBehaviorInObjectOrGroup(
+      const gd::String& objectOrGroupName,
+      const gd::String& behaviorName,
+      bool searchInGroups = true) const;
 
   /**
    * \brief Get a type from a behavior name
    * @return Type of the behavior.
    * @deprecated - Use GetTypeOfBehaviorInObjectOrGroup instead.
    */
-  gd::String GetTypeOfBehavior(const gd::String& behaviorName, bool searchInGroups = true) const;
+  gd::String GetTypeOfBehavior(const gd::String& behaviorName,
+                               bool searchInGroups = true) const;
 
   /**
    * \brief Get behaviors of an object/group
@@ -101,9 +117,8 @@ class GD_CORE_API ObjectsContainersList {
    *
    * @return Vector containing names of behaviors
    */
-  std::vector<gd::String>
-  GetBehaviorsOfObject(const gd::String& objectName,
-                       bool searchInGroups = true) const;
+  std::vector<gd::String> GetBehaviorsOfObject(
+      const gd::String& objectName, bool searchInGroups = true) const;
 
   /**
    * \brief Return a list containing all objects refered to by the group.
@@ -121,9 +136,24 @@ class GD_CORE_API ObjectsContainersList {
   void ForEachObject(std::function<void(const gd::Object& object)> fn) const;
 
   /**
-   * \brief Call the callback for each object or group name starting with the prefix passed in parameter.
+   * \brief Call the callback for each object or group name matching the
+   * search passed in parameter.
    */
-  void ForEachNameWithPrefix(const gd::String& prefix, std::function<void(const gd::String& name, const gd::ObjectConfiguration* objectConfiguration)> fn) const;
+  void ForEachNameMatchingSearch(
+      const gd::String& search,
+      std::function<void(const gd::String& name,
+                         const gd::ObjectConfiguration* objectConfiguration)>
+          fn) const;
+
+  /**
+   * \brief Call the callback for each variable of the object (or group)
+   * matching the search passed in parameter.
+   */
+  void ForEachObjectOrGroupVariableMatchingSearch(
+      const gd::String& objectOrGroupName,
+      const gd::String& search,
+      std::function<void(const gd::String& variableName,
+                         const gd::Variable& variable)> fn) const;
 
   /** Do not use - should be private but accessible to let Emscripten create a
    * temporary. */
@@ -132,6 +162,24 @@ class GD_CORE_API ObjectsContainersList {
  private:
   bool HasObjectNamed(const gd::String& name) const;
 
+  bool HasObjectWithVariableNamed(const gd::String& objectName,
+                                  const gd::String& variableName) const;
+
+  bool HasObjectVariablesContainer(
+      const gd::String& objectName,
+      const gd::VariablesContainer& variablesContainer) const;
+
+  const gd::VariablesContainer* GetObjectVariablesContainer(
+      const gd::String& objectName) const;
+
+  gd::Variable::Type GetTypeOfObjectVariable(const gd::String& objectName, const gd::String& variableName) const;
+
+  void ForEachObjectVariableMatchingSearch(
+      const gd::String& objectOrGroupName,
+      const gd::String& search,
+      std::function<void(const gd::String& variableName,
+                         const gd::Variable& variable)> fn) const;
+
   void Add(const gd::ObjectsContainer& objectsContainer) {
     objectsContainers.push_back(&objectsContainer);
   };

Core/GDCore/Project/Project.cpp

@@ -48,11 +48,6 @@ using namespace std;
 
 namespace gd {
 
-// By default, disallow unicode in identifiers, but this can be set to true
-// by the IDE. In the future, this will be set to true by default, keeping backward compatibility.
-// We keep it disabled by default to progressively ask users to test it in real projects.
-bool Project::allowUsageOfUnicodeIdentifierNames = false;
-
 Project::Project()
     : name(_("Project")),
       version("1.0.0"),
@@ -86,26 +81,24 @@ Project::~Project() {}
 
 void Project::ResetProjectUuid() { projectUuid = UUID::MakeUuid4(); }
 
-std::unique_ptr<gd::Object>
-Project::CreateObject(const gd::String &objectType, const gd::String &name) const {
-  std::unique_ptr<gd::Object> object =
-      gd::make_unique<Object>(name, objectType, CreateObjectConfiguration(objectType));
+std::unique_ptr<gd::Object> Project::CreateObject(
+    const gd::String& objectType, const gd::String& name) const {
+  std::unique_ptr<gd::Object> object = gd::make_unique<Object>(
+      name, objectType, CreateObjectConfiguration(objectType));
 
-  auto &platform = GetCurrentPlatform();
-  auto &project = *this;
-  auto addDefaultBehavior =
-      [&platform,
-       &project,
-       &object,
-       &objectType](const gd::String& behaviorType) {
-    auto &behaviorMetadata =
+  auto& platform = GetCurrentPlatform();
+  auto& project = *this;
+  auto addDefaultBehavior = [&platform, &project, &object, &objectType](
+                                const gd::String& behaviorType) {
+    auto& behaviorMetadata =
         gd::MetadataProvider::GetBehaviorMetadata(platform, behaviorType);
     if (MetadataProvider::IsBadBehaviorMetadata(behaviorMetadata)) {
-      gd::LogWarning("Object: " + objectType + " has an unknown default behavior: " + behaviorType);
+      gd::LogWarning("Object: " + objectType +
+                     " has an unknown default behavior: " + behaviorType);
       return;
     }
-    auto* behavior = object->AddNewBehavior(project, behaviorType,
-                          behaviorMetadata.GetDefaultName());
+    auto* behavior = object->AddNewBehavior(
+        project, behaviorType, behaviorMetadata.GetDefaultName());
     behavior->SetDefaultBehavior(true);
   };
 
@@ -114,18 +107,17 @@ Project::CreateObject(const gd::String &objectType, const gd::String &name) cons
     addDefaultBehavior("ResizableCapability::ResizableBehavior");
     addDefaultBehavior("ScalableCapability::ScalableBehavior");
     addDefaultBehavior("FlippableCapability::FlippableBehavior");
-  }
-  else {
-    auto &objectMetadata = gd::MetadataProvider::GetObjectMetadata(platform, objectType);
+  } else {
+    auto& objectMetadata =
+        gd::MetadataProvider::GetObjectMetadata(platform, objectType);
     if (MetadataProvider::IsBadObjectMetadata(objectMetadata)) {
       gd::LogWarning("Object: " + name + " has an unknown type: " + objectType);
     }
-    for (auto &behaviorType : objectMetadata.GetDefaultBehaviors()) {
+    for (auto& behaviorType : objectMetadata.GetDefaultBehaviors()) {
       addDefaultBehavior(behaviorType);
     }
   }
 
-  
   return std::move(object);
 }
 
@@ -849,6 +841,11 @@ void Project::UnserializeFrom(const SerializerElement& element) {
   resourcesManager.UnserializeFrom(
       element.GetChild("resources", 0, "Resources"));
   UnserializeObjectsFrom(*this, element.GetChild("objects", 0, "Objects"));
+  if (element.HasChild("objectsFolderStructure")) {
+    UnserializeFoldersFrom(*this, element.GetChild("objectsFolderStructure", 0));
+  }
+  AddMissingObjectsInRootFolder();
+
   GetVariables().UnserializeFrom(element.GetChild("variables", 0, "Variables"));
 
   scenes.clear();
@@ -1000,6 +997,7 @@ void Project::SerializeTo(SerializerElement& element) const {
 
   resourcesManager.SerializeTo(element.AddChild("resources"));
   SerializeObjectsTo(element.AddChild("objects"));
+  SerializeFoldersTo(element.AddChild("objectsFolderStructure"));
   GetObjectGroups().SerializeTo(element.AddChild("objectsGroups"));
   GetVariables().SerializeTo(element.AddChild("variables"));
 
@@ -1038,28 +1036,18 @@ void Project::SerializeTo(SerializerElement& element) const {
         externalSourceFilesElement.AddChild("sourceFile"));
 }
 
-void Project::AllowUsageOfUnicodeIdentifierNames(bool enable) {
-  allowUsageOfUnicodeIdentifierNames = enable;
-}
-
 bool Project::IsNameSafe(const gd::String& name) {
   if (name.empty()) return false;
 
   if (isdigit(name[0])) return false;
 
-  if (!allowUsageOfUnicodeIdentifierNames) {
-    gd::String legacyAllowedCharacters =
-        "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_";
-    return !(name.find_first_not_of(legacyAllowedCharacters) != gd::String::npos);
-  } else {
-    for (auto character : name) {
-      if (!GrammarTerminals::IsAllowedInIdentifier(character)) {
-        return false;
-      }
+  for (auto character : name) {
+    if (!GrammarTerminals::IsAllowedInIdentifier(character)) {
+      return false;
     }
-
-    return true;
   }
+
+  return true;
 }
 
 gd::String Project::GetSafeName(const gd::String& name) {
@@ -1069,18 +1057,13 @@ gd::String Project::GetSafeName(const gd::String& name) {
 
   if (isdigit(name[0])) newName = "_" + newName;
 
-  gd::String legacyAllowedCharacters =
-      "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_";
-
-  for (size_t i = 0;i < newName.size();++i) {
-    // Note that iterating on the characters is not super efficient (O(n^2), which
-    // could be avoided with an iterator), but this function is not critical for performance
-    // (only used to generate a name when a user creates a new entity or rename one).
+  for (size_t i = 0; i < newName.size(); ++i) {
+    // Note that iterating on the characters is not super efficient (O(n^2),
+    // which could be avoided with an iterator), but this function is not
+    // critical for performance (only used to generate a name when a user
+    // creates a new entity or rename one).
     auto character = newName[i];
-    bool isAllowed =
-        allowUsageOfUnicodeIdentifierNames
-            ? GrammarTerminals::IsAllowedInIdentifier(character)
-            : legacyAllowedCharacters.find(character) != gd::String::npos;
+    bool isAllowed = GrammarTerminals::IsAllowedInIdentifier(character);
 
     // Replace all unallowed letters by an underscore.
     if (!isAllowed) {

Core/GDCore/Project/Project.h

@@ -11,12 +11,12 @@
 
 #include "GDCore/Project/ExtensionProperties.h"
 #include "GDCore/Project/LoadingScreen.h"
-#include "GDCore/Project/Watermark.h"
 #include "GDCore/Project/ObjectGroupsContainer.h"
 #include "GDCore/Project/ObjectsContainer.h"
 #include "GDCore/Project/PlatformSpecificAssets.h"
 #include "GDCore/Project/ResourcesManager.h"
 #include "GDCore/Project/VariablesContainer.h"
+#include "GDCore/Project/Watermark.h"
 #include "GDCore/String.h"
 namespace gd {
 class Platform;
@@ -82,7 +82,9 @@ class GD_CORE_API Project : public ObjectsContainer {
   /**
    * \brief Change the project description
    */
-  void SetDescription(const gd::String& description_) { description = description_; };
+  void SetDescription(const gd::String& description_) {
+    description = description_;
+  };
 
   /**
    * \brief Get the project description
@@ -124,7 +126,9 @@ class GD_CORE_API Project : public ObjectsContainer {
   /**
    * \brief Get the author usernames of the project.
    */
-  const std::vector<gd::String>& GetAuthorUsernames() const { return authorUsernames; };
+  const std::vector<gd::String>& GetAuthorUsernames() const {
+    return authorUsernames;
+  };
 
   /**
    * \brief Get the author usernames of the project, to modify them (non-const).
@@ -135,7 +139,9 @@ class GD_CORE_API Project : public ObjectsContainer {
    * Define the project as playable with a keyboard.
    * \param enable True to define the project as playable with a keyboard.
    */
-  void SetPlayableWithKeyboard(bool playable = true) { isPlayableWithKeyboard = playable; }
+  void SetPlayableWithKeyboard(bool playable = true) {
+    isPlayableWithKeyboard = playable;
+  }
 
   /**
    * Check if the project is defined as playable with a keyboard.
@@ -146,7 +152,9 @@ class GD_CORE_API Project : public ObjectsContainer {
    * Define the project as playable with a gamepad.
    * \param enable True to define the project as playable with a gamepad.
    */
-  void SetPlayableWithGamepad(bool playable = true) { isPlayableWithGamepad = playable; }
+  void SetPlayableWithGamepad(bool playable = true) {
+    isPlayableWithGamepad = playable;
+  }
 
   /**
    * Check if the project is defined as playable with a gamepad.
@@ -157,7 +165,9 @@ class GD_CORE_API Project : public ObjectsContainer {
    * Define the project as playable on a mobile.
    * \param enable True to define the project as playable on a mobile.
    */
-  void SetPlayableWithMobile(bool playable = true) { isPlayableWithMobile = playable; }
+  void SetPlayableWithMobile(bool playable = true) {
+    isPlayableWithMobile = playable;
+  }
 
   /**
    * Check if the project is defined as playable on a mobile.
@@ -391,17 +401,23 @@ class GD_CORE_API Project : public ObjectsContainer {
   /**
    * Set the antialiasing mode used by the game ("none" or "MSAA").
    */
-  void SetAntialiasingMode(const gd::String& antialiasingMode_) { antialiasingMode = antialiasingMode_; }
+  void SetAntialiasingMode(const gd::String& antialiasingMode_) {
+    antialiasingMode = antialiasingMode_;
+  }
 
   /**
    * Return true if antialising is enabled on mobiles.
    */
-  bool IsAntialisingEnabledOnMobile() const { return isAntialisingEnabledOnMobile; }
+  bool IsAntialisingEnabledOnMobile() const {
+    return isAntialisingEnabledOnMobile;
+  }
 
   /**
    * Set whether antialising is enabled on mobiles or not.
    */
-  void SetAntialisingEnabledOnMobile(bool enable) { isAntialisingEnabledOnMobile = enable; }
+  void SetAntialisingEnabledOnMobile(bool enable) {
+    isAntialisingEnabledOnMobile = enable;
+  }
 
   /**
    * \brief Return if the project should set 0 as Z-order for objects created
@@ -905,7 +921,8 @@ class GD_CORE_API Project : public ObjectsContainer {
   /**
    * \brief Return the events based object with a given type.
    */
-  const gd::EventsBasedObject& GetEventsBasedObject(const gd::String& type) const;
+  const gd::EventsBasedObject& GetEventsBasedObject(
+      const gd::String& type) const;
 
   /**
    * \brief  Check if events based behavior with a given type exists.
@@ -920,7 +937,8 @@ class GD_CORE_API Project : public ObjectsContainer {
   /**
    * \brief Return the events based behavior with a given type.
    */
-  const gd::EventsBasedBehavior& GetEventsBasedBehavior(const gd::String& type) const;
+  const gd::EventsBasedBehavior& GetEventsBasedBehavior(
+      const gd::String& type) const;
 
   ///@}
 
@@ -969,20 +987,6 @@ class GD_CORE_API Project : public ObjectsContainer {
    */
   ///@{
 
-  /**
-   * Check if unicode names are allowed in identifier names.
-   * \see IsNameSafe
-   * \see GetSafeName
-   */
-  static bool IsUsageOfUnicodeIdentifierNamesAllowed() { return allowUsageOfUnicodeIdentifierNames; };
-
-  /**
-   * Set if unicode names are allowed in identifier names.
-   * \see IsNameSafe
-   * \see GetSafeName
-   */
-  static void AllowUsageOfUnicodeIdentifierNames(bool enable);
-
   /**
    * Return true if \a name is valid (can be used safely for an object,
    * behavior, events function name, etc...).
@@ -990,8 +994,8 @@ class GD_CORE_API Project : public ObjectsContainer {
   static bool IsNameSafe(const gd::String& name);
 
   /**
-   * Return a name, based on the one passed in parameter, that can be safely used
-   * for an object, behavior, events function name, etc...
+   * Return a name, based on the one passed in parameter, that can be safely
+   * used for an object, behavior, events function name, etc...
    */
   static gd::String GetSafeName(const gd::String& name);
   ///@}
@@ -1068,8 +1072,8 @@ class GD_CORE_API Project : public ObjectsContainer {
   bool adaptGameResolutionAtRuntime;  ///< Should the game resolution be adapted
                                       ///< to the window size at runtime
   gd::String
-      sizeOnStartupMode;   ///< How to adapt the game size to the screen. Can be
-                           ///< "adaptWidth", "adaptHeight" or empty
+      sizeOnStartupMode;  ///< How to adapt the game size to the screen. Can be
+                          ///< "adaptWidth", "adaptHeight" or empty
   gd::String antialiasingMode;
   bool isAntialisingEnabledOnMobile;
   gd::String projectUuid;  ///< UUID useful to identify the game in online
@@ -1095,19 +1099,18 @@ class GD_CORE_API Project : public ObjectsContainer {
       externalSourceFiles;  ///< List of external source files used.
   gd::String author;        ///< Game author name, for publishing purpose.
   std::vector<gd::String>
-      authorIds;           ///< Game author ids, from GDevelop users DB.
+      authorIds;  ///< Game author ids, from GDevelop users DB.
   std::vector<gd::String>
-      authorUsernames;     ///< Game author usernames, from GDevelop users DB.
-  std::vector<gd::String>
-      categories;           ///< Game categories
-  bool isPlayableWithKeyboard; ///< The project is playable with a keyboard.
-  bool isPlayableWithGamepad;  ///< The project is playable with a gamepad.
-  bool isPlayableWithMobile;   ///< The project is playable on a mobile.
-  gd::String packageName;  ///< Game package name
-  gd::String templateSlug; ///< The slug of the template from which the game is
-                           ///< created.
-  gd::String orientation;  ///< Lock game orientation (on mobile devices).
-                           ///< "default", "landscape" or "portrait".
+      authorUsernames;  ///< Game author usernames, from GDevelop users DB.
+  std::vector<gd::String> categories;  ///< Game categories
+  bool isPlayableWithKeyboard;  ///< The project is playable with a keyboard.
+  bool isPlayableWithGamepad;   ///< The project is playable with a gamepad.
+  bool isPlayableWithMobile;    ///< The project is playable on a mobile.
+  gd::String packageName;       ///< Game package name
+  gd::String templateSlug;  ///< The slug of the template from which the game is
+                            ///< created.
+  gd::String orientation;   ///< Lock game orientation (on mobile devices).
+                            ///< "default", "landscape" or "portrait".
   bool
       folderProject;  ///< True if folder project, false if single file project.
   gd::String
@@ -1128,8 +1131,6 @@ class GD_CORE_API Project : public ObjectsContainer {
                                         ///< time the project was saved.
   mutable unsigned int gdBuildVersion;  ///< The GD build version used the last
                                         ///< time the project was saved.
-
-  static bool allowUsageOfUnicodeIdentifierNames;
 };
 
 }  // namespace gd

Core/GDCore/Project/ProjectScopedContainers.h

@@ -97,8 +97,8 @@ class ProjectScopedContainers {
     return notFoundCallback();
   };
 
-  void ForEachIdentifierWithPrefix(
-      const gd::String &prefix,
+  void ForEachIdentifierMatchingSearch(
+      const gd::String &search,
       std::function<void(const gd::String &name,
                          const ObjectConfiguration *objectConfiguration)>
           objectCallback,
@@ -110,8 +110,8 @@ class ProjectScopedContainers {
           parameterCallback) const {
     std::set<gd::String> namesAlreadySeen;
 
-    objectsContainersList.ForEachNameWithPrefix(
-        prefix,
+    objectsContainersList.ForEachNameMatchingSearch(
+        search,
         [&](const gd::String &name,
             const ObjectConfiguration *objectConfiguration) {
           if (namesAlreadySeen.count(name) == 0) {
@@ -119,24 +119,24 @@ class ProjectScopedContainers {
             objectCallback(name, objectConfiguration);
           }
         });
-    variablesContainersList.ForEachVariableWithPrefix(
-        prefix, [&](const gd::String &name, const gd::Variable &variable) {
+    variablesContainersList.ForEachVariableMatchingSearch(
+        search, [&](const gd::String &name, const gd::Variable &variable) {
           if (namesAlreadySeen.count(name) == 0) {
             namesAlreadySeen.insert(name);
             variableCallback(name, variable);
           }
         });
-    gd::ParameterMetadataTools::ForEachParameterWithPrefix(
+    gd::ParameterMetadataTools::ForEachParameterMatchingSearch(
         parametersVectorsList,
-        prefix,
+        search,
         [&](const gd::ParameterMetadata &parameter) {
           if (namesAlreadySeen.count(parameter.GetName()) == 0) {
             namesAlreadySeen.insert(parameter.GetName());
             parameterCallback(parameter);
           }
         });
-    propertiesContainersList.ForEachPropertyWithPrefix(
-        prefix, [&](const gd::NamedPropertyDescriptor &property) {
+    propertiesContainersList.ForEachPropertyMatchingSearch(
+        search, [&](const gd::NamedPropertyDescriptor &property) {
           if (namesAlreadySeen.count(property.GetName()) == 0) {
             namesAlreadySeen.insert(property.GetName());
             propertyCallback(property);

Core/GDCore/Project/PropertiesContainer.h

@@ -31,9 +31,13 @@ class PropertiesContainer
     return *this;
   }
 
-  void ForEachPropertyWithPrefix(const gd::String& prefix, std::function<void(const gd::NamedPropertyDescriptor& property)> fn) const {
-    for (const auto& property: elements) {
-      if (property->GetName().find(prefix) == 0) fn(*property);
+  void ForEachPropertyMatchingSearch(
+      const gd::String& search,
+      std::function<void(const gd::NamedPropertyDescriptor& property)> fn)
+      const {
+    for (const auto& property : elements) {
+      if (property->GetName().FindCaseInsensitive(search) != gd::String::npos)
+        fn(*property);
     }
   }
 

Core/GDCore/Project/PropertiesContainersList.cpp

@@ -55,12 +55,12 @@ bool PropertiesContainersList::HasPropertiesContainer(const gd::PropertiesContai
   return false;
 }
 
-void PropertiesContainersList::ForEachPropertyWithPrefix(
-    const gd::String& prefix,
+void PropertiesContainersList::ForEachPropertyMatchingSearch(
+    const gd::String& search,
     std::function<void(const gd::NamedPropertyDescriptor& property)> fn) const {
   for (auto it = propertiesContainers.rbegin(); it != propertiesContainers.rend();
        ++it) {
-    (*it)->ForEachPropertyWithPrefix(prefix, fn);
+    (*it)->ForEachPropertyMatchingSearch(search, fn);
   }
 }
 

Core/GDCore/Project/PropertiesContainersList.h

@@ -67,9 +67,9 @@ class GD_CORE_API PropertiesContainersList {
   }
 
   /**
-   * \brief Call the callback for each property having a name starting with the specified prefix.
+   * \brief Call the callback for each property having a name matching the specified search.
    */
-  void ForEachPropertyWithPrefix(const gd::String& prefix, std::function<void(const gd::NamedPropertyDescriptor& property)> fn) const;
+  void ForEachPropertyMatchingSearch(const gd::String& search, std::function<void(const gd::NamedPropertyDescriptor& property)> fn) const;
 
   /** Do not use - should be private but accessible to let Emscripten create a
    * temporary. */