Remove useless commits in changelog script (#7511)

Do not show in changelog

.github/workflows/update-extension-translations.yml

@@ -0,0 +1,47 @@
+# GitHub Action to update extension translations.
+# It copies the latest messages.js files from the GDevelop-extensions repository
+# and opens a Pull Request with the changes on GDevelop's repository.
+
+name: Update extension translations
+on:
+  push:
+    branches:
+      - master
+    tags-ignore:
+      - "**" # Don't run on new tags
+  workflow_dispatch: # Allows manual triggering from the Actions tab
+
+jobs:
+  update-extension-translations:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout current repository
+        uses: actions/checkout@v3
+
+      - name: Clone GDevelop-extensions repository
+        run: git clone https://github.com/GDevelopApp/GDevelop-extensions.git /tmp/GDevelop-extensions
+
+      - name: Copy and rename translation files
+        run: |
+          mkdir -p newIDE/app/src/locales
+          for folder in /tmp/GDevelop-extensions/.translations/*; do
+            if [ -d "$folder" ]; then
+              lang=$(basename "$folder")
+              mkdir -p "newIDE/app/src/locales/$lang"
+              cp "$folder/messages.js" "newIDE/app/src/locales/$lang/extension-messages.js"
+            fi
+          done
+          cp /tmp/GDevelop-extensions/.translations/LocalesMetadata.js newIDE/app/src/locales/ExtensionLocalesMetadata.js
+
+      - name: Create Pull Request with updated translations
+        uses: peter-evans/create-pull-request@v6
+        with:
+          commit-message: Update extension translations [skip ci]
+          branch: chore/update-extension-translations
+          delete-branch: true
+          title: "[Auto PR] Update extension translations"
+          body: |
+            This updates the extension translations by copying the latest messages.js files from the GDevelop-extensions repository.
+            Each messages.js file is renamed to extension-messages.js and placed in the corresponding language folder under `newIDE/app/src/locales`.
+
+            Please review the changes carefully before merging.

Core/GDCore/Events/CodeGeneration/EventsCodeGenerator.cpp

@@ -1358,12 +1358,30 @@ gd::String EventsCodeGenerator::GeneratePropertyGetter(const gd::PropertiesConta
   return "getProperty" + property.GetName() + "As" + type + "()";
 }
 
+gd::String EventsCodeGenerator::GeneratePropertyGetterWithoutCasting(
+    const gd::PropertiesContainer &propertiesContainer,
+    const gd::NamedPropertyDescriptor &property) {
+  return "getProperty" + property.GetName() + "()";
+}
+
+gd::String EventsCodeGenerator::GeneratePropertySetterWithoutCasting(
+    const gd::PropertiesContainer &propertiesContainer,
+    const gd::NamedPropertyDescriptor &property,
+    const gd::String &operandCode) {
+  return "setProperty" + property.GetName() + "(" + operandCode + ")";
+    }
+
 gd::String EventsCodeGenerator::GenerateParameterGetter(const gd::ParameterMetadata& parameter,
                                                         const gd::String& type,
                                                         gd::EventsCodeGenerationContext& context) {
   return "getParameter" + parameter.GetName() + "As" + type + "()";
 }
 
+gd::String EventsCodeGenerator::GenerateParameterGetterWithoutCasting(
+    const gd::ParameterMetadata &parameter) {
+      return "getParameter" + parameter.GetName() + "()";
+    }
+
 EventsCodeGenerator::EventsCodeGenerator(const gd::Project& project_,
                                          const gd::Layout& layout,
                                          const gd::Platform& platform_)

Core/GDCore/Events/CodeGeneration/EventsCodeGenerator.h

@@ -467,7 +467,14 @@ class GD_CORE_API EventsCodeGenerator {
    */
   virtual gd::String GetCodeNamespace() { return ""; };
 
-  enum VariableScope { LAYOUT_VARIABLE = 0, PROJECT_VARIABLE, OBJECT_VARIABLE, ANY_VARIABLE };
+  enum VariableScope {
+    LAYOUT_VARIABLE = 0,
+    PROJECT_VARIABLE,
+    OBJECT_VARIABLE,
+    ANY_VARIABLE,
+    VARIABLE_OR_PROPERTY,
+    VARIABLE_OR_PROPERTY_OR_PARAMETER
+  };
 
   /**
    * Generate a single unique number for the specified instruction.
@@ -510,6 +517,11 @@ class GD_CORE_API EventsCodeGenerator {
   GenerateAnyOrSceneVariableGetter(const gd::Expression &variableExpression,
                                    EventsCodeGenerationContext &context);
 
+  virtual gd::String GeneratePropertySetterWithoutCasting(
+      const gd::PropertiesContainer &propertiesContainer,
+      const gd::NamedPropertyDescriptor &property,
+      const gd::String &operandCode);
+
 protected:
   virtual const gd::String GenerateRelationalOperatorCodes(
       const gd::String& operatorString);
@@ -565,7 +577,8 @@ protected:
       const gd::String& variableName,
       const VariableScope& scope,
       gd::EventsCodeGenerationContext& context,
-      const gd::String& objectName) {
+      const gd::String& objectName,
+      bool hasChild) {
     // This code is only used as a mock.
     // See the real implementation in GDJS.
     if (scope == LAYOUT_VARIABLE) {
@@ -573,7 +586,9 @@ protected:
 
     } else if (scope == PROJECT_VARIABLE) {
       return "getProjectVariable(" + variableName + ")";
-    } else if (scope == ANY_VARIABLE) {
+    } else if (scope == ANY_VARIABLE || scope == VARIABLE_OR_PROPERTY ||
+               scope == VARIABLE_OR_PROPERTY_OR_PARAMETER) {
+      // TODO Split the 3 cases to make tests stronger.
       return "getAnyVariable(" + variableName + ")";
     }
 
@@ -627,11 +642,18 @@ protected:
       const gd::String& type,
       gd::EventsCodeGenerationContext& context);
 
+  virtual gd::String GeneratePropertyGetterWithoutCasting(
+      const gd::PropertiesContainer &propertiesContainer,
+      const gd::NamedPropertyDescriptor &property);
+
   virtual gd::String GenerateParameterGetter(
       const gd::ParameterMetadata& parameter,
       const gd::String& type,
       gd::EventsCodeGenerationContext& context);
 
+  virtual gd::String
+  GenerateParameterGetterWithoutCasting(const gd::ParameterMetadata &parameter);
+
   /**
    * \brief Generate the code to reference an object which is
    * in an empty/null state.

Core/GDCore/Events/CodeGeneration/ExpressionCodeGenerator.cpp

@@ -135,18 +135,20 @@ void ExpressionCodeGenerator::OnVisitVariableNode(VariableNode& node) {
     EventsCodeGenerator::VariableScope scope =
         type == "variable"
             ? gd::EventsCodeGenerator::ANY_VARIABLE
-        : type == "globalvar"
-            ? gd::EventsCodeGenerator::PROJECT_VARIABLE
-            : type == "scenevar"
-                  ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
-                  : gd::EventsCodeGenerator::OBJECT_VARIABLE;
+        : type == "variableOrProperty"
+            ? gd::EventsCodeGenerator::VARIABLE_OR_PROPERTY
+        : type == "variableOrPropertyOrParameter"
+            ? gd::EventsCodeGenerator::VARIABLE_OR_PROPERTY_OR_PARAMETER
+        : type == "globalvar" ? gd::EventsCodeGenerator::PROJECT_VARIABLE
+        : type == "scenevar"  ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
+                              : gd::EventsCodeGenerator::OBJECT_VARIABLE;
 
     auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(codeGenerator.GetPlatform(),
                                           codeGenerator.GetObjectsContainersList(),
                                           rootObjectName,
                                           node);
     output += codeGenerator.GenerateGetVariable(
-        node.name, scope, context, objectName);
+        node.name, scope, context, objectName, node.child != nullptr);
     if (node.child) node.child->Visit(*this);
   } else {
     // The node represents a variable or an object variable in an expression waiting for its *value* to be returned.
@@ -163,7 +165,7 @@ void ExpressionCodeGenerator::OnVisitVariableNode(VariableNode& node) {
       output += codeGenerator.GenerateVariableValueAs(type);
     }, [&]() {
       output += codeGenerator.GenerateGetVariable(
-          node.name, gd::EventsCodeGenerator::ANY_VARIABLE, context, "");
+          node.name, gd::EventsCodeGenerator::ANY_VARIABLE, context, "", node.child != nullptr);
       if (node.child) node.child->Visit(*this);
       output += codeGenerator.GenerateVariableValueAs(type);
     }, [&]() {
@@ -184,8 +186,9 @@ void ExpressionCodeGenerator::OnVisitVariableAccessorNode(
     VariableAccessorNode& node) {
     if (!objectNameToUseForVariableAccessor.empty()) {
       // Use the name of the object passed by the parent, as we need both to access an object variable.
-      output += codeGenerator.GenerateGetVariable(node.name,
-          gd::EventsCodeGenerator::OBJECT_VARIABLE, context, objectNameToUseForVariableAccessor);
+      output += codeGenerator.GenerateGetVariable(
+          node.name, gd::EventsCodeGenerator::OBJECT_VARIABLE, context,
+          objectNameToUseForVariableAccessor, node.child != nullptr);
 
       // We have accessed an object variable, from now we can continue accessing the child variables
       // (including using the bracket notation).
@@ -222,24 +225,27 @@ void ExpressionCodeGenerator::OnVisitIdentifierNode(IdentifierNode& node) {
     output +=
         codeGenerator.GenerateObject(node.identifierName, type, context);
   } else if (gd::ParameterMetadata::IsExpression("variable", type)) {
-      EventsCodeGenerator::VariableScope scope =
+    EventsCodeGenerator::VariableScope scope =
         type == "variable"
             ? gd::EventsCodeGenerator::ANY_VARIABLE
-        : type == "globalvar"
-              ? gd::EventsCodeGenerator::PROJECT_VARIABLE
-              : type == "scenevar"
-                    ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
-                    : gd::EventsCodeGenerator::OBJECT_VARIABLE;
+        : type == "variableOrProperty"
+            ? gd::EventsCodeGenerator::VARIABLE_OR_PROPERTY
+        : type == "variableOrPropertyOrParameter"
+            ? gd::EventsCodeGenerator::VARIABLE_OR_PROPERTY_OR_PARAMETER
+        : type == "globalvar" ? gd::EventsCodeGenerator::PROJECT_VARIABLE
+        : type == "scenevar"  ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
+                              : gd::EventsCodeGenerator::OBJECT_VARIABLE;
 
-      auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(codeGenerator.GetPlatform(),
-                                            codeGenerator.GetObjectsContainersList(),
-                                            rootObjectName,
-                                            node);
-      output += codeGenerator.GenerateGetVariable(
-          node.identifierName, scope, context, objectName);
-      if (!node.childIdentifierName.empty()) {
-        output += codeGenerator.GenerateVariableAccessor(node.childIdentifierName);
-      }
+    auto objectName = gd::ExpressionVariableOwnerFinder::GetObjectName(
+        codeGenerator.GetPlatform(), codeGenerator.GetObjectsContainersList(),
+        rootObjectName, node);
+    output += codeGenerator.GenerateGetVariable(
+        node.identifierName, scope, context, objectName,
+        !node.childIdentifierName.empty());
+    if (!node.childIdentifierName.empty()) {
+      output +=
+          codeGenerator.GenerateVariableAccessor(node.childIdentifierName);
+    }
   } else {
     const auto& variablesContainersList = codeGenerator.GetProjectScopedContainers().GetVariablesContainersList();
     const auto& propertiesContainersList = codeGenerator.GetProjectScopedContainers().GetPropertiesContainersList();
@@ -249,12 +255,13 @@ void ExpressionCodeGenerator::OnVisitIdentifierNode(IdentifierNode& node) {
     codeGenerator.GetProjectScopedContainers().MatchIdentifierWithName<void>(node.identifierName, [&]() {
       // Generate the code to access the object variable.
       output += codeGenerator.GenerateGetVariable(
-        node.childIdentifierName, gd::EventsCodeGenerator::OBJECT_VARIABLE, context, node.identifierName);
+          node.childIdentifierName, gd::EventsCodeGenerator::OBJECT_VARIABLE,
+          context, node.identifierName, !node.childIdentifierName.empty());
       output += codeGenerator.GenerateVariableValueAs(type);
     }, [&]() {
       output += codeGenerator.GenerateGetVariable(
-          node.identifierName, gd::EventsCodeGenerator::ANY_VARIABLE, context,
-          "");
+          node.identifierName, gd::EventsCodeGenerator::VARIABLE_OR_PROPERTY_OR_PARAMETER, context,
+          "", !node.childIdentifierName.empty());
       if (!node.childIdentifierName.empty()) {
         output += codeGenerator.GenerateVariableAccessor(node.childIdentifierName);
       }

Core/GDCore/Events/Event.cpp

@@ -18,8 +18,6 @@ namespace gd {
 
 EventsList BaseEvent::badSubEvents;
 VariablesContainer BaseEvent::badLocalVariables;
-std::vector<gd::String> BaseEvent::emptyDependencies;
-gd::String BaseEvent::emptySourceFile;
 
 BaseEvent::BaseEvent()
     : totalTimeDuringLastSession(0),

Core/GDCore/Events/Event.h

@@ -175,26 +175,6 @@ class GD_CORE_API BaseEvent {
         noExpr;
     return noExpr;
   };
-
-  /**
-   * \brief Returns the dependencies on source files of the project.
-   * \note Default implementation returns an empty list of dependencies. This is
-   * fine for most events that are not related to adding custom user source
-   * code.
-   */
-  virtual const std::vector<gd::String>& GetSourceFileDependencies() const {
-    return emptyDependencies;
-  };
-
-  /**
-   * \brief Returns the name of the source file associated with the event
-   * \note Default implementation returns an empty string. This is fine for most
-   * events that are not related to adding custom user source code.
-   */
-  virtual const gd::String& GetAssociatedGDManagedSourceFile(
-      gd::Project& project) const {
-    return emptySourceFile;
-  };
   ///@}
 
   /** \name Code generation
@@ -327,8 +307,6 @@ class GD_CORE_API BaseEvent {
 
   static gd::EventsList badSubEvents;
   static gd::VariablesContainer badLocalVariables;
-  static std::vector<gd::String> emptyDependencies;
-  static gd::String emptySourceFile;
 };
 
 /**

Core/GDCore/Extensions/Builtin/AdvancedExtension.cpp

@@ -141,7 +141,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAdvancedExtension(
                     "res/function32.png")
       .AddParameter("functionParameterName", _("Parameter name"), "number,string,boolean")
       .SetRelevantForFunctionEventsOnly()
-      .MarkAsAdvanced();
+      .MarkAsAdvanced()
+      .SetHidden();
 
   extension
       .AddExpression(
@@ -177,7 +178,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAdvancedExtension(
       .AddParameter("functionParameterName", _("Parameter name"), "number,string,boolean")
       .UseStandardRelationalOperatorParameters(
           "number", gd::ParameterOptions::MakeNewOptions())
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddCondition(
@@ -191,7 +193,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsAdvancedExtension(
       .AddParameter("functionParameterName", _("Parameter name"), "number,string,boolean")
       .UseStandardRelationalOperatorParameters(
           "string", gd::ParameterOptions::MakeNewOptions())
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 }
 
 }  // namespace gd

Core/GDCore/Extensions/Builtin/BaseObjectExtension.cpp

@@ -117,7 +117,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Change the position of the center of _PARAM0_: _PARAM1_ "
                   "_PARAM2_ (x "
                   "axis), _PARAM3_ _PARAM4_ (y axis)"),
-                _("Position/Center"),
+                _("Position ❯ Center"),
                 "res/actions/position24_black.png",
                 "res/actions/position_black.png")
       .AddParameter("object", _("Object"))
@@ -133,7 +133,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Center X position"),
          _("the X position of the center of rotation"),
          _("the X position of the center"),
-         _("Position/Center"),
+         _("Position ❯ Center"),
          "res/actions/position24_black.png")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -144,7 +144,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Center Y position"),
          _("the Y position of the center of rotation"),
          _("the Y position of the center"),
-         _("Position/Center"),
+         _("Position ❯ Center"),
          "res/actions/position24_black.png")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -155,7 +155,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                                 _("the bounding box (the area encapsulating "
                                   "the object) left position"),
                                 _("the bounding box left position"),
-                                _("Position/Bounding Box"),
+                                _("Position ❯ Bounding Box"),
                                 "res/conditions/bounding-box-left_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -166,7 +166,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Bounding box top position"),
          _("the bounding box (the area encapsulating the object) top position"),
          _("the bounding box top position"),
-         _("Position/Bounding Box"),
+         _("Position ❯ Bounding Box"),
          "res/conditions/bounding-box-top_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -177,7 +177,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                                 _("the bounding box (the area encapsulating "
                                   "the object) right position"),
                                 _("the bounding box right position"),
-                                _("Position/Bounding Box"),
+                                _("Position ❯ Bounding Box"),
                                 "res/conditions/bounding-box-right_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -188,7 +188,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                                 _("the bounding box (the area encapsulating "
                                   "the object) bottom position"),
                                 _("the bounding box bottom position"),
-                                _("Position/Bounding Box"),
+                                _("Position ❯ Bounding Box"),
                                 "res/conditions/bounding-box-bottom_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -199,7 +199,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                                 _("the bounding box (the area encapsulating "
                                   "the object) center X position"),
                                 _("the bounding box center X position"),
-                                _("Position/Bounding Box"),
+                                _("Position ❯ Bounding Box"),
                                 "res/conditions/bounding-box-center_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -210,7 +210,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                                 _("the bounding box (the area encapsulating "
                                   "the object) center Y position"),
                                 _("the bounding box center Y position"),
-                                _("Position/Bounding Box"),
+                                _("Position ❯ Bounding Box"),
                                 "res/conditions/bounding-box-center_black.svg")
       .AddParameter("object", _("Object"))
       .UseStandardParameters("number", ParameterOptions::MakeNewOptions());
@@ -255,7 +255,6 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Angle"),
                 "res/actions/rotate24_black.png",
                 "res/actions/rotate_black.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angular speed (in degrees per second)"))
       .AddCodeOnlyParameter("currentScene", "")
@@ -269,7 +268,6 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Angle"),
          "res/actions/rotate24_black.png",
          "res/actions/rotate_black.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angle to rotate towards (in degrees)"))
       .AddParameter("expression", _("Angular speed (in degrees per second)"))
@@ -285,7 +283,6 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Angle"),
          "res/actions/rotate24_black.png",
          "res/actions/rotate_black.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("X position"))
       .AddParameter("expression", _("Y position"))
@@ -304,12 +301,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Movement using forces"),
          "res/actions/force24.png",
          "res/actions/force.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Speed on X axis (in pixels per second)"))
       .AddParameter("expression", _("Speed on Y axis (in pixels per second)"))
       .AddParameter("forceMultiplier", _("Force multiplier"), "", true)
-      .SetDefaultValue("0");
+      .SetDefaultValue("0")
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   obj.AddAction("AddForceAL",
                 _("Add a force (angle)"),
@@ -321,12 +318,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Movement using forces"),
                 "res/actions/force24.png",
                 "res/actions/force.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angle"))
       .AddParameter("expression", _("Speed (in pixels per second)"))
       .AddParameter("forceMultiplier", _("Force multiplier"), "", true)
       .SetDefaultValue("0")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddAction(
@@ -339,13 +336,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Movement using forces"),
          "res/actions/force24.png",
          "res/actions/force.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("X position"))
       .AddParameter("expression", _("Y position"))
       .AddParameter("expression", _("Speed (in pixels per second)"))
       .AddParameter("forceMultiplier", _("Force multiplier"), "", true)
       .SetDefaultValue("0")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddAction(
@@ -360,13 +357,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Movement using forces"),
          "res/actions/forceTourne24.png",
          "res/actions/forceTourne.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("expression", "X position of the center")
       .AddParameter("expression", "Y position of the center")
       .AddParameter("expression", "Speed (in Degrees per seconds)")
       .AddParameter("expression", "Distance (in pixels)")
       .AddParameter("forceMultiplier", "Force multiplier")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .SetHidden();
 
   obj.AddAction("Arreter",
@@ -376,8 +373,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Movement using forces"),
                 "res/actions/arreter24.png",
                 "res/actions/arreter.png")
-
       .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddAction("Delete",
@@ -429,6 +426,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("objectvar", _("Variable"))
       .UseStandardOperatorParameters("number",
                                      ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForLayoutEventsOnly();
 
   obj.AddAction("SetStringObjectVariable",
@@ -443,6 +441,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("objectvar", _("Variable"))
       .UseStandardOperatorParameters("string",
                                      ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForLayoutEventsOnly();
 
   obj.AddAction("SetBooleanObjectVariable",
@@ -458,6 +457,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       // This parameter allows to keep the operand expression
       // when the editor switch between variable instructions.
       .AddCodeOnlyParameter("yesorno", _("Value"))
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForLayoutEventsOnly();
 
   obj.AddCondition("NumberObjectVariable",
@@ -472,6 +472,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("objectvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForLayoutEventsOnly();
 
   obj.AddCondition("StringObjectVariable",
@@ -486,6 +487,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("objectvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "string", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForLayoutEventsOnly();
 
   obj.AddCondition("BooleanObjectVariable",
@@ -502,6 +504,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       // This parameter allows to keep the operand expression
       // when the editor switch between variable instructions.
       .AddCodeOnlyParameter("yesorno", _("Value"))
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForLayoutEventsOnly();
 
   obj.AddAction("ModVarObjet",
@@ -514,6 +517,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
 
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
+      .SetHelpPath("/all-features/variables/object-variables/")
       .UseStandardOperatorParameters("number",
                                      ParameterOptions::MakeNewOptions())
       .SetRelevantForFunctionEventsOnly();
@@ -528,6 +532,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
 
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
+      .SetHelpPath("/all-features/variables/object-variables/")
       .UseStandardOperatorParameters("string",
                                      ParameterOptions::MakeNewOptions())
       .SetRelevantForFunctionEventsOnly();
@@ -544,6 +549,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .AddParameter("trueorfalse", _("New Value:"))
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForFunctionEventsOnly();
 
   obj.AddAction(
@@ -560,6 +566,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
 
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("ObjectVariableChildExists",
@@ -567,24 +574,26 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                    _("Check if the specified child of the object "
                      "structure variable exists."),
                    _("Child _PARAM2_ of variable _PARAM1_ of _PARAM0_ exists"),
-                   _("Variables/Arrays and structures"),
+                   _("Variables ❯ Arrays and structures"),
                    "res/conditions/var24.png",
                    "res/conditions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Structure variable"))
       .AddParameter("string", _("Name of the child"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddAction("ObjectVariableRemoveChild",
                 _("Remove a child"),
                 _("Remove a child from an object structure variable."),
                 _("Remove child _PARAM2_ from variable _PARAM1_ of _PARAM0_"),
-                _("Variables/Arrays and structures"),
+                _("Variables ❯ Arrays and structures"),
                 "res/actions/var24.png",
                 "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Structure variable"))
       .AddParameter("string", _("Child's name"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddAction("ObjectVariableClearChildren",
@@ -592,11 +601,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Remove all the children from the object array or structure "
                   "variable."),
                 _("Clear children from variable _PARAM1_ of _PARAM0_"),
-                _("Variables/Arrays and structures"),
+                _("Variables ❯ Arrays and structures"),
                 "res/actions/var24.png",
                 "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array or structure variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddAction("Cache",
@@ -691,8 +701,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                    _("Movement using forces"),
                    "res/conditions/arret24.png",
                    "res/conditions/arret.png")
-
       .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddCondition("Vitesse",
@@ -702,10 +712,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                    _("Movement using forces"),
                    "res/conditions/vitesse24.png",
                    "res/conditions/vitesse.png")
-
       .AddParameter("object", _("Object"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   // Deprecated
@@ -722,6 +732,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angle, in degrees"))
       .AddParameter("expression", _("Tolerance, in degrees"))
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddCondition("IsTotalForceAngleAround",
@@ -735,6 +746,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("Angle, in degrees"))
       .AddParameter("expression", _("Tolerance, in degrees"))
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddCondition("VarObjet",
@@ -749,6 +761,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("objectvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("VarObjetTxt",
@@ -763,6 +776,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("objectvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "string", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("ObjectVariableAsBoolean",
@@ -777,6 +791,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("objectvar", _("Variable"))
       .AddParameter("trueorfalse", _("Check if the value is"))
       .SetDefaultValue("true")
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForFunctionEventsOnly();
 
   obj.AddCondition("VarObjetDef",
@@ -796,12 +811,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Add text variable"),
          _("Adds a text (string) to the end of an object array variable."),
          _("Add value _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var24.png",
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("string", _("Text to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced()
       .SetRelevantForLayoutEventsOnly();
 
@@ -809,12 +825,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Add variable array value"),
                 _("Adds a number to the end of an object array variable."),
                 _("Add value _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-                _("Variables/Arrays and structures"),
+                _("Variables ❯ Arrays and structures"),
                 "res/actions/var24.png",
                 "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("expression", _("Number to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced()
       .SetRelevantForLayoutEventsOnly();
 
@@ -823,12 +840,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Add boolean variable"),
          _("Adds a boolean to the end of an object array variable."),
          _("Add value _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var24.png",
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("trueorfalse", _("Boolean to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced()
       .SetRelevantForLayoutEventsOnly();
 
@@ -838,7 +856,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Add existing variable"),
          _("Adds an existing variable to the end of an object array variable."),
          _("Add variable _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var24.png",
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
@@ -847,6 +865,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .SetParameterLongDescription(_("The content of the object variable will "
                                      "*be copied* and added at the "
                                      "end of the array."))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced()
       .SetHidden();
 
@@ -855,7 +874,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Add existing variable"),
          _("Adds an existing variable to the end of an object array variable."),
          _("Add variable _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var24.png",
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
@@ -864,6 +883,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .SetParameterLongDescription(_("The content of the object variable will "
                                      "*be copied* and added at the "
                                      "end of the array."))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddAction(
@@ -871,12 +891,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Add text variable"),
          _("Adds a text (string) to the end of an object array variable."),
          _("Add text _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var24.png",
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("string", _("Text to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced()
       .SetRelevantForFunctionEventsOnly();
 
@@ -884,12 +905,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Add number variable"),
                 _("Adds a number to the end of an object array variable."),
                 _("Add number _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-                _("Variables/Arrays and structures"),
+                _("Variables ❯ Arrays and structures"),
                 "res/actions/var24.png",
                 "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("expression", _("Number to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced()
       .SetRelevantForFunctionEventsOnly();
 
@@ -898,12 +920,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Add boolean variable"),
          _("Adds a boolean to the end of an object array variable."),
          _("Add boolean _PARAM2_ to array variable _PARAM1_ of _PARAM0_"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var24.png",
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("trueorfalse", _("Boolean to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced()
       .SetRelevantForFunctionEventsOnly();
 
@@ -914,12 +937,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
            "variable."),
          _("Remove variable at index _PARAM2_ from array variable _PARAM1_ of "
            "_PARAM0_"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var24.png",
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Array variable"))
       .AddParameter("expression", _("Index to remove"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddCondition(
@@ -927,13 +951,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Number of children"),
          _("Compare the number of children in an object array variable."),
          _("The number of children in the array variable _PARAM1_"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/conditions/var24.png",
          "res/conditions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   obj.AddStrExpression(
@@ -941,40 +966,44 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("First text child"),
          _("Get the value of the first element of an object array variable, if "
            "it is a text (string) variable."),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Array variable"));
+      .AddParameter("objectvar", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   obj.AddExpression(
          "ArrayVariableFirstNumber",
          _("First number child"),
          _("Get the value of the first element of an object array variable, if "
            "it is a number variable."),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Array variable"));
+      .AddParameter("objectvar", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   obj.AddStrExpression(
          "ArrayVariableLastString",
          _("Last text child"),
          _("Get the value of the last element of an object array variable, if "
            "it is a text (string) variable."),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Array variable"));
+      .AddParameter("objectvar", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   obj.AddExpression(
          "ArrayVariableLastNumber",
          _("Last number child"),
          _("Get the value of the last element of an object array variable, if "
            "it is a number variable."),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Array variable"));
+      .AddParameter("objectvar", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   obj.AddCondition("BehaviorActivated",
                    _("Behavior activated"),
@@ -1009,12 +1038,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Movement using forces"),
                 "res/actions/forceVers24.png",
                 "res/actions/forceVers.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("objectPtr", _("Target Object"))
       .AddParameter("expression", _("Speed (in pixels per second)"))
       .AddParameter("forceMultiplier", _("Force multiplier"), "", true)
       .SetDefaultValue("0")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddAction(
@@ -1029,13 +1058,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          _("Movement using forces"),
          "res/actions/forceTourne24.png",
          "res/actions/forceTourne.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("objectPtr", _("Rotate around this object"))
       .AddParameter("expression", _("Speed (in degrees per second)"))
       .AddParameter("expression", _("Distance (in pixels)"))
       .AddParameter("forceMultiplier", _("Force multiplier"), "", true)
       .SetDefaultValue("0")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   obj.AddAction("MettreAutour",
@@ -1063,10 +1092,10 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Movement using forces"),
                 "res/actions/ecarter24.png",
                 "res/actions/ecarter.png")
-
       .SetHidden()
       .AddParameter("object", _("Object"))
-      .AddParameter("objectList", "Object 2 (won't move)");
+      .AddParameter("objectList", "Object 2 (won't move)")
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   // Deprecated action
   obj.AddAction("Ecarter",
@@ -1090,7 +1119,6 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 _("Position"),
                 "res/actions/ecarter24.png",
                 "res/actions/ecarter.png")
-
       .AddParameter("object", _("Object"))
       .AddParameter("objectList", _("Objects (won't move)"))
       .AddParameter("yesorno",
@@ -1099,6 +1127,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     "",
                     true)
       .SetDefaultValue("no")
+      .SetHelpPath("/all-features/collisions/")
       .MarkAsSimple();
 
   obj.AddCondition("CollisionPoint",
@@ -1111,6 +1140,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("expression", _("X position of the point"))
       .AddParameter("expression", _("Y position of the point"))
+      .SetHelpPath("/all-features/collisions/")
       .MarkAsSimple();
 
   extension
@@ -1142,6 +1172,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("object", _("Object"))
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
       .AddParameter("expression", _("Time in seconds"))
+      .SetHelpPath("/all-features/timers-and-time/")
       .SetHidden();
 
   obj.AddCondition(
@@ -1157,6 +1188,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
       .AddParameter("relationalOperator", _("Sign of the test"), "time")
       .AddParameter("expression", _("Time in seconds"))
+      .SetHelpPath("/all-features/timers-and-time/")
       .SetManipulatedType("number");
 
   obj.AddCondition("ObjectTimerPaused",
@@ -1168,6 +1200,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                    "res/conditions/timerPaused.png")
       .AddParameter("object", _("Object"))
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/")
       .MarkAsAdvanced();
 
   obj.AddAction(
@@ -1180,7 +1213,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          "res/actions/timer24.png",
          "res/actions/timer.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("identifier", _("Timer's name"), "objectTimer");
+      .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/");
 
   obj.AddAction("PauseObjectTimer",
                 _("Pause an object timer"),
@@ -1191,6 +1225,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 "res/actions/pauseTimer.png")
       .AddParameter("object", _("Object"))
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/")
       .MarkAsAdvanced();
 
   obj.AddAction("UnPauseObjectTimer",
@@ -1202,6 +1237,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 "res/actions/unPauseTimer.png")
       .AddParameter("object", _("Object"))
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/")
       .MarkAsAdvanced();
 
   obj.AddAction("RemoveObjectTimer",
@@ -1213,6 +1249,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                 "res/actions/timer.png")
       .AddParameter("object", _("Object"))
       .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/")
       .MarkAsAdvanced();
 
   obj.AddExpression("X",
@@ -1241,28 +1278,32 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     _("X coordinate of the sum of forces"),
                     _("Movement using forces"),
                     "res/actions/force.png")
-      .AddParameter("object", _("Object"));
+      .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   obj.AddExpression("ForceY",
                     _("Y coordinate of the sum of forces"),
                     _("Y coordinate of the sum of forces"),
                     _("Movement using forces"),
                     "res/actions/force.png")
-      .AddParameter("object", _("Object"));
+      .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   obj.AddExpression("ForceAngle",
                     _("Angle of the sum of forces"),
                     _("Angle of the sum of forces (in degrees)"),
                     _("Movement using forces"),
                     "res/actions/force.png")
-      .AddParameter("object", _("Object"));
+      .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   obj.AddExpression("ForceLength",
                     _("Length of the sum of forces"),
                     _("Length of the sum of forces"),
                     _("Movement using forces"),
                     "res/actions/force.png")
-      .AddParameter("object", _("Object"));
+      .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/");
 
   obj.AddExpression("Longueur",
                     _("Length of the sum of forces"),
@@ -1270,6 +1311,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     _("Movement using forces"),
                     "res/actions/force.png")
       .AddParameter("object", _("Object"))
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .SetHidden();
 
   obj.AddExpression("Width",
@@ -1366,10 +1408,11 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
          "VariableChildCount",
          _("Number of children"),
          _("Number of children in an object array or structure variable"),
-         _("Variables/Arrays and structures"),
+         _("Variables ❯ Arrays and structures"),
          "res/actions/var.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("objectvar", _("Array or structure variable"));
+      .AddParameter("objectvar", _("Array or structure variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   obj.AddStrExpression("VariableString",
                        _("Text variable"),
@@ -1378,6 +1421,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                        "res/actions/var.png")
       .AddParameter("object", _("Object"))
       .AddParameter("objectvar", _("Variable"))
+      .SetHelpPath("/all-features/variables/object-variables/")
       .SetRelevantForFunctionEventsOnly();
 
   obj.AddExpression("ObjectTimerElapsedTime",
@@ -1386,7 +1430,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     _("Timers"),
                     "res/actions/time.png")
       .AddParameter("object", _("Object"))
-      .AddParameter("identifier", _("Timer's name"), "objectTimer");
+      .AddParameter("identifier", _("Timer's name"), "objectTimer")
+      .SetHelpPath("/all-features/timers-and-time/");
 
   obj.AddExpression("AngleToObject",
                     _("Angle between two objects"),
@@ -1606,6 +1651,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
           "res/actions/doMove24.png",
           "res/actions/doMove.png")
       .AddCodeOnlyParameter("currentScene", "")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   extension
@@ -1621,6 +1667,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
       .AddParameter("objectList", _("Object 2"))
       .AddParameter("expression", _("Tolerance, in degrees"))
       .AddCodeOnlyParameter("conditionInverted", "")
+      .SetHelpPath("/tutorials/how-to-move-objects/")
       .MarkAsAdvanced();
 
   extension
@@ -1753,6 +1800,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
                     "",
                     true)
       .SetDefaultValue("no")
+      .SetHelpPath("/all-features/collisions/")
       .MarkAsSimple();
 
   extension
@@ -1815,6 +1863,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
           _("Scene variable where to store the Y position of the intersection. "
             "If no intersection is found, the variable won't be changed."))
       .AddCodeOnlyParameter("conditionInverted", "")
+      .SetHelpPath("/all-features/collisions/")
       .MarkAsAdvanced();
 
   extension
@@ -1846,6 +1895,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsBaseObjectExtension(
           _("Scene variable where to store the Y position of the intersection. "
             "If no intersection is found, the variable won't be changed."))
       .AddCodeOnlyParameter("conditionInverted", "")
+      .SetHelpPath("/all-features/collisions/")
       .MarkAsAdvanced();
 
   extension

Core/GDCore/Extensions/Builtin/CommonInstructionsExtension.cpp

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

Core/GDCore/Extensions/Builtin/ExternalLayoutsExtension.cpp

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

Core/GDCore/Extensions/Builtin/KeyboardExtension.cpp

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

Core/GDCore/Extensions/Builtin/MathematicalToolsExtension.cpp

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

Core/GDCore/Extensions/Builtin/MouseExtension.cpp

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

Core/GDCore/Extensions/Builtin/VariablesExtension.cpp

@@ -33,7 +33,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     "",
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
-      .AddParameter("variable", _("Variable"))
+      .AddParameter("variableOrPropertyOrParameter", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions());
 
@@ -45,7 +45,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     "",
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
-      .AddParameter("variable", _("Variable"))
+      .AddParameter("variableOrPropertyOrParameter", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "string", ParameterOptions::MakeNewOptions());
 
@@ -58,7 +58,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           "",
           "res/conditions/var24.png",
           "res/conditions/var.png")
-      .AddParameter("variable", _("Variable"))
+      .AddParameter("variableOrPropertyOrParameter", _("Variable"))
       .AddParameter("trueorfalse", _("Check if the value is"))
       .SetDefaultValue("true")
       // This parameter allows to keep the operand expression
@@ -73,7 +73,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  "",
                  "res/actions/var24.png",
                  "res/actions/var.png")
-      .AddParameter("variable", _("Variable"))
+      .AddParameter("variableOrProperty", _("Variable"))
       .UseStandardOperatorParameters("number",
                                      ParameterOptions::MakeNewOptions());
 
@@ -85,7 +85,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  "",
                  "res/actions/var24.png",
                  "res/actions/var.png")
-      .AddParameter("variable", _("Variable"))
+      .AddParameter("variableOrProperty", _("Variable"))
       .UseStandardOperatorParameters("string",
                                      ParameterOptions::MakeNewOptions());
 
@@ -98,7 +98,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           "",
           "res/conditions/var24.png",
           "res/conditions/var.png")
-      .AddParameter("variable", _("Variable"))
+      .AddParameter("variableOrProperty", _("Variable"))
       .AddParameter("operator", _("Value"), "boolean")
       // This parameter allows to keep the operand expression
       // when the editor switch between variable instructions.
@@ -116,6 +116,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
       .AddParameter("variable", _("Array variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   extension
@@ -129,6 +130,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     "res/conditions/var.png")
       .AddParameter("variable", _("Variable"))
       .AddParameter("string", _("Name of the child"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   extension
@@ -142,6 +144,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           "res/actions/var.png")
       .AddParameter("variable", _("Structure variable"))
       .AddParameter("string", _("Child's name"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   extension
@@ -154,6 +157,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("variable", _("Structure or array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   extension
@@ -170,6 +174,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
       .SetParameterLongDescription(
           _("The content of the variable will *be copied* and added at the "
             "end of the array."))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   extension
@@ -183,6 +188,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           "res/actions/var.png")
       .AddParameter("variable", _("Array variable"))
       .AddParameter("string", _("Text to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   extension
@@ -195,6 +201,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  "res/actions/var.png")
       .AddParameter("variable", _("Array variable"))
       .AddParameter("expression", _("Number to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   extension
@@ -207,6 +214,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  "res/actions/var.png")
       .AddParameter("variable", _("Array variable"))
       .AddParameter("trueorfalse", _("Boolean to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   extension
@@ -221,6 +229,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  "res/actions/var.png")
       .AddParameter("variable", _("Array variable"))
       .AddParameter("expression", _("Index to remove"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced();
 
   extension
@@ -231,7 +240,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
             "it is a text (string)."),
           _("Arrays and structures"),
           "res/actions/var.png")
-      .AddParameter("variable", _("Array variable"));
+      .AddParameter("variable", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   extension
       .AddExpression(
@@ -241,7 +251,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
             "it is a number."),
           _("Arrays and structures"),
           "res/actions/var.png")
-      .AddParameter("variable", _("Array variable"));
+      .AddParameter("variable", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   extension
       .AddStrExpression(
@@ -251,7 +262,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
             "it is a text (string)."),
           _("Arrays and structures"),
           "res/actions/var.png")
-      .AddParameter("variable", _("Array variable"));
+      .AddParameter("variable", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   extension
       .AddExpression(
@@ -261,7 +273,8 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
             "it is a number."),
           _("Arrays and structures"),
           "res/actions/var.png")
-      .AddParameter("variable", _("Array variable"));
+      .AddParameter("variable", _("Array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   // Legacy instructions
 
@@ -270,26 +283,28 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     _("Number variable"),
                     _("Compare the number value of a scene variable."),
                     _("The number of scene variable _PARAM0_"),
-                    _("External variables/Scene variables"),
+                    _("External variables ❯ Scene variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddCondition("VarSceneTxt",
                     _("Text variable"),
                     _("Compare the text (string) of a scene variable."),
                     _("The text of scene variable _PARAM0_"),
-                    _("External variables/Scene variables"),
+                    _("External variables ❯ Scene variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "string", ParameterOptions::MakeNewOptions())
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddCondition(
@@ -297,13 +312,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Boolean variable"),
           _("Compare the boolean value of a scene variable."),
           _("The boolean value of scene variable _PARAM0_ is _PARAM1_"),
-          _("External variables/Scene variables"),
+          _("External variables ❯ Scene variables"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .AddParameter("trueorfalse", _("Check if the value is"))
       .SetDefaultValue("true")
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddCondition("VariableChildExists",
@@ -311,12 +327,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     _("Check if the specified child of the scene structure "
                       "variable exists."),
                     _("Child _PARAM1_ of scene variable _PARAM0_ exists"),
-                    _("External variables/Scene variables/Arrays and structures"),
+                    _("External variables ❯ Scene variables ❯ Arrays and structures"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .AddParameter("string", _("Name of the child"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -325,12 +343,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     _("Check if the specified child of the global structure "
                       "variable exists."),
                     _("Child _PARAM1_ of global variable _PARAM0_ exists"),
-                    _("External variables/Global variables/Arrays and structures"),
+                    _("External variables ❯ Global variables ❯ Arrays and structures"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .AddParameter("string", _("Name of the child"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -338,7 +358,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     "Variable defined",
                     "Test if the scene variable exists.",
                     "Scene variable _PARAM0_ is defined",
-                    _("External variables/Scene variables"),
+                    _("External variables ❯ Scene variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddCodeOnlyParameter("currentScene", "")
@@ -350,13 +370,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     _("Number variable"),
                     _("Compare the number value of a global variable."),
                     _("the global variable _PARAM0_"),
-                    _("External variables/Global variables"),
+                    _("External variables ❯ Global variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -364,13 +385,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                     _("Text variable"),
                     _("Compare the text (string) of a global variable."),
                     _("the text of the global variable _PARAM0_"),
-                    _("External variables/Global variables"),
+                    _("External variables ❯ Global variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .UseStandardRelationalOperatorParameters(
           "string", ParameterOptions::MakeNewOptions())
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -379,20 +401,21 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Boolean variable"),
           _("Compare the boolean value of a global variable."),
           _("The boolean value of global variable _PARAM0_ is _PARAM1_"),
-          _("External variables/Global variables"),
+          _("External variables ❯ Global variables"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .AddParameter("trueorfalse", _("Check if the value is"))
       .SetDefaultValue("true")
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddCondition("VarGlobalDef",
                     "Variable defined",
                     "Test if a global variable exists.",
                     "Global variable _PARAM0_ is defined",
-                    _("External variables/Global variables"),
+                    _("External variables ❯ Global variables"),
                     "res/conditions/var24.png",
                     "res/conditions/var.png")
       .AddCodeOnlyParameter("currentScene", "")
@@ -405,26 +428,28 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Change number variable"),
                  _("Modify the number value of a scene variable."),
                  _("the scene variable _PARAM0_"),
-                 _("External variables/Scene variables"),
+                 _("External variables ❯ Scene variables"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .UseStandardOperatorParameters("number",
                                      ParameterOptions::MakeNewOptions())
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction("ModVarSceneTxt",
                  _("Change text variable"),
                  _("Modify the text (string) of a scene variable."),
                  _("the text of scene variable _PARAM0_"),
-                 _("External variables/Scene variables"),
+                 _("External variables ❯ Scene variables"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .UseStandardOperatorParameters("string",
                                      ParameterOptions::MakeNewOptions())
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction(
@@ -432,12 +457,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Change boolean variable"),
           _("Modify the boolean value of a scene variable."),
           _("Set the boolean value of scene variable _PARAM0_ to _PARAM1_"),
-          _("External variables/Scene variables"),
+          _("External variables ❯ Scene variables"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
       .AddParameter("trueorfalse", _("New Value:"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction("ToggleSceneVariableAsBoolean",
@@ -446,24 +472,26 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                      _("If it was true, it will become false, and if it was "
                        "false it will become true."),
                  _("Toggle the boolean value of scene variable _PARAM0_"),
-                 _("External variables/Scene variables"),
+                 _("External variables ❯ Scene variables"),
                  "res/conditions/var24.png",
                  "res/conditions/var.png")
       .AddParameter("scenevar", _("Variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction("ModVarGlobal",
                  _("Change number variable"),
                  _("Modify the number value of a global variable."),
                  _("the global variable _PARAM0_"),
-                 _("External variables/Global variables"),
+                 _("External variables ❯ Global variables"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .UseStandardOperatorParameters("number",
                                      ParameterOptions::MakeNewOptions())
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -471,13 +499,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Change text variable"),
                  _("Modify the text (string) of a global variable."),
                  _("the text of global variable _PARAM0_"),
-                 _("External variables/Global variables"),
+                 _("External variables ❯ Global variables"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .UseStandardOperatorParameters("string",
                                      ParameterOptions::MakeNewOptions())
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -486,12 +515,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Change boolean variable"),
           _("Modify the boolean value of a global variable."),
           _("Set the boolean value of global variable _PARAM0_ to _PARAM1_"),
-          _("External variables/Global variables"),
+          _("External variables ❯ Global variables"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
       .AddParameter("trueorfalse", _("New Value:"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction("ToggleGlobalVariableAsBoolean",
@@ -500,11 +530,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                      _("If it was true, it will become false, and if it was "
                        "false it will become true."),
                  _("Toggle the boolean value of global variable _PARAM0_"),
-                 _("External variables/Global variables"),
+                 _("External variables ❯ Global variables"),
                  "res/conditions/var24.png",
                  "res/conditions/var.png")
       .AddParameter("globalvar", _("Variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction(
@@ -512,13 +543,15 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Remove a child"),
           _("Remove a child from a scene structure variable."),
           _("Remove child _PARAM1_ from scene structure variable _PARAM0_"),
-          _("External variables/Scene variables/Arrays and structures"),
+          _("External variables ❯ Scene variables ❯ Arrays and structures"),
           "res/actions/var24.png",
           "res/actions/var.png")
       .AddParameter("scenevar", _("Structure variable"))
       .AddParameter("string", _("Child's name"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced()
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction(
@@ -526,13 +559,15 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Remove a child"),
           _("Remove a child from a global structure variable."),
           _("Remove child _PARAM1_ from global structure variable _PARAM0_"),
-          _("External variables/Global variables/Arrays and structures"),
+          _("External variables ❯ Global variables ❯ Arrays and structures"),
           "res/actions/var24.png",
           "res/actions/var.png")
       .AddParameter("globalvar", _("Structure variable"))
       .AddParameter("string", _("Child's name"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .MarkAsAdvanced()
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction("VariableClearChildren",
@@ -540,11 +575,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Remove all the children from the scene structure or array "
                    "variable."),
                  _("Clear children from scene variable _PARAM0_"),
-                 _("External variables/Scene variables/Arrays and structures"),
+                 _("External variables ❯ Scene variables ❯ Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Structure or array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -553,11 +590,13 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Remove all the children from the global structure or array "
                    "variable."),
                  _("Clear children from global variable _PARAM0_"),
-                 _("External variables/Global variables/Arrays and structures"),
+                 _("External variables ❯ Global variables ❯ Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Structure or array variable"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -566,7 +605,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Adds an existing variable at the end of a scene array "
                    "variable."),
                  _("Add variable _PARAM1_ to array variable _PARAM0_"),
-                 _("External variables/Scene variables/Arrays and structures"),
+                 _("External variables ❯ Scene variables ❯ Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
@@ -574,7 +613,9 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
       .SetParameterLongDescription(
           _("The content of the variable will *be copied* and added at the "
             "end of the array."))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -583,12 +624,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Add text variable"),
           _("Adds a text (string) at the end of a scene array variable."),
           _("Add text _PARAM1_ to array variable _PARAM0_"),
-          _("External variables/Scene variables/Arrays and structures"),
+          _("External variables ❯ Scene variables ❯ Arrays and structures"),
           "res/actions/var24.png",
           "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
       .AddParameter("string", _("Text to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -596,12 +639,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Add number variable"),
                  _("Adds a number at the end of a scene array variable."),
                  _("Add number _PARAM1_ to array variable _PARAM0_"),
-                 _("External variables/Scene variables/Arrays and structures"),
+                 _("External variables ❯ Scene variables ❯ Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
       .AddParameter("expression", _("Number to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -609,12 +654,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Add boolean variable"),
                  _("Adds a boolean at the end of a scene array variable."),
                  _("Add boolean _PARAM1_ to array variable _PARAM0_"),
-                 _("External variables/Scene variables/Arrays and structures"),
+                 _("External variables ❯ Scene variables ❯ Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
       .AddParameter("trueorfalse", _("Boolean to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -624,12 +671,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                    "variable."),
                  _("Remove variable at index _PARAM1_ from scene array "
                    "variable _PARAM0_"),
-                 _("External variables/Scene variables/Arrays and structures"),
+                 _("External variables ❯ Scene variables ❯ Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
       .AddParameter("expression", _("Index to remove"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -638,13 +687,15 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Number of children"),
           _("Compare the number of children in a scene array variable."),
           _("The number of children in the array variable _PARAM0_"),
-          _("External variables/Scene variables/Arrays and structures"),
+          _("External variables ❯ Scene variables ❯ Arrays and structures"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("scenevar", _("Array variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -653,10 +704,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("First text child"),
           _("Get the value of the first element of a scene array variable, if "
             "it is a text (string)."),
-          _("External variables/Scene variables/Arrays and structures"),
+          _("External variables ❯ Scene variables ❯ Arrays and structures"),
           "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddExpression(
@@ -664,10 +717,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("First number child"),
           _("Get the value of the first element of a scene array variable, if "
             "it is a number."),
-          _("External variables/Scene variables/Arrays and structures"),
+          _("External variables ❯ Scene variables ❯ Arrays and structures"),
           "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddStrExpression(
@@ -675,10 +730,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Last text child"),
           _("Get the value of the last element of a scene array variable, if "
             "it is a text (string)."),
-          _("External variables/Scene variables/Arrays and structures"),
+          _("External variables ❯ Scene variables ❯ Arrays and structures"),
           "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddExpression(
@@ -686,10 +743,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Last number child"),
           _("Get the value of the last element of a scene array variable, if "
             "it is a number."),
-          _("External variables/Scene variables/Arrays and structures"),
+          _("External variables ❯ Scene variables ❯ Arrays and structures"),
           "res/actions/var.png")
       .AddParameter("scenevar", _("Array variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddAction(
@@ -697,7 +756,7 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Add existing variable"),
           _("Adds an existing variable at the end of a global array variable."),
           _("Add variable _PARAM1_ to array variable _PARAM0_"),
-          _("External variables/Global variables/Arrays and structures"),
+          _("External variables ❯ Global variables ❯ Arrays and structures"),
           "res/actions/var24.png",
           "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
@@ -705,7 +764,9 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
       .SetParameterLongDescription(
           _("The content of the variable will *be copied* and added at the "
             "end of the array."))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -715,12 +776,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                    "array variable."),
                  _("Remove variable at index _PARAM1_ from global array "
                    "variable _PARAM0_"),
-                 _("External variables/Global variables/Arrays and structures"),
+                 _("External variables ❯ Global variables ❯ Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
       .AddParameter("expression", _("Index to remove"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -729,12 +792,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Add text variable"),
           _("Adds a text (string) at the end of a global array variable."),
           _("Add text _PARAM1_ to array variable _PARAM0_"),
-          _("External variables/Global variables/Arrays and structures"),
+          _("External variables ❯ Global variables ❯ Arrays and structures"),
           "res/actions/var24.png",
           "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
       .AddParameter("string", _("Text to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -742,12 +807,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Add number variable"),
                  _("Adds a number at the end of a global array variable."),
                  _("Add number _PARAM1_ to array variable _PARAM0_"),
-                 _("External variables/Global variables/Arrays and structures"),
+                 _("External variables ❯ Global variables ❯ Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
       .AddParameter("expression", _("Number to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -755,12 +822,14 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                  _("Add boolean variable"),
                  _("Adds a boolean at the end of a global array variable."),
                  _("Add boolean _PARAM1_ to array variable _PARAM0_"),
-                 _("External variables/Global variables/Arrays and structures"),
+                 _("External variables ❯ Global variables ❯ Arrays and structures"),
                  "res/actions/var24.png",
                  "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
       .AddParameter("trueorfalse", _("Boolean to add"))
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -769,13 +838,15 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Number of children"),
           _("Compare the number of children in a global array variable."),
           _("The number of children of the array variable _PARAM0_"),
-          _("External variables/Global variables/Arrays and structures"),
+          _("External variables ❯ Global variables ❯ Arrays and structures"),
           "res/conditions/var24.png",
           "res/conditions/var.png")
       .AddParameter("globalvar", _("Array variable"))
       .UseStandardRelationalOperatorParameters(
           "number", ParameterOptions::MakeNewOptions())
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
       .SetRelevantForFunctionEventsOnly()
+      .SetHidden()
       .MarkAsAdvanced();
 
   extension
@@ -783,20 +854,24 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                         _("First text child"),
                         _("Value of the first element of a global array "
                           "variable, if it is a text (string) variable."),
-                        _("External variables/Global variables/Arrays and structures"),
+                        _("External variables ❯ Global variables ❯ Arrays and structures"),
                         "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddExpression("GlobalVariableFirstNumber",
                      _("First number child"),
                      _("Value of the first element of a global array "
                        "variable, if it is a number variable"),
-                     _("External variables/Global variables/Arrays and structures"),
+                     _("External variables ❯ Global variables ❯ Arrays and structures"),
                      "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddStrExpression(
@@ -804,10 +879,12 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Last text child"),
           _("Value of the last element of a global array variable, if "
             "it is a text (string) variable."),
-          _("External variables/Global variables/Arrays and structures"),
+          _("External variables ❯ Global variables ❯ Arrays and structures"),
           "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddExpression(
@@ -815,20 +892,23 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
           _("Last number child"),
           _("Value of the last element of a global array variable, if "
             "it is a number variable"),
-          _("External variables/Global variables/Arrays and structures"),
+          _("External variables ❯ Global variables ❯ Arrays and structures"),
           "res/actions/var.png")
       .AddParameter("globalvar", _("Array variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddExpression("GlobalVariableChildCount",
                      _("Number of children"),
                      _("Number of children in a global array or "
                        "structure variable"),
-                     _("External variables/Global variables/Arrays and structures"),
+                     _("External variables ❯ Global variables ❯ Arrays and structures"),
                      "res/actions/var.png")
       .AddParameter("globalvar", _("Array or structure variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetHelpPath("/all-features/variables/structures-and-arrays/")
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddExpression("VariableChildCount",
@@ -837,43 +917,48 @@ void GD_CORE_API BuiltinExtensionsImplementer::ImplementsVariablesExtension(
                        "structure variable"),
                      _("Arrays and structures"),
                      "res/actions/var.png")
-      .AddParameter("variable", _("Array or structure variable"), "AllowUndeclaredVariable");
+      .AddParameter("variable", _("Array or structure variable"), "AllowUndeclaredVariable")
+      .SetHelpPath("/all-features/variables/structures-and-arrays/");
 
   extension
       .AddExpression("Variable",
                      _("Number variable"),
                      _("Number value of a scene variable"),
-                     _("External variables/Scene variables"),
+                     _("External variables ❯ Scene variables"),
                      "res/actions/var.png")
       .AddParameter("scenevar", _("Variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddStrExpression("VariableString",
                         _("Text variable"),
                         _("Text of a scene variable"),
-                        _("External variables/Scene variables"),
+                        _("External variables ❯ Scene variables"),
                         "res/actions/var.png")
       .AddParameter("scenevar", _("Variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddExpression("GlobalVariable",
                      _("Number variable"),
                      _("Number value of a global variable"),
-                     _("External variables/Global variables"),
+                     _("External variables ❯ Global variables"),
                      "res/actions/var.png")
       .AddParameter("globalvar", _("Name of the global variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 
   extension
       .AddStrExpression("GlobalVariableString",
                         _("Text variable"),
                         _("Text of a global variable"),
-                        _("External variables/Global variables"),
+                        _("External variables ❯ Global variables"),
                         "res/actions/var.png")
       .AddParameter("globalvar", _("Variable"))
-      .SetRelevantForFunctionEventsOnly();
+      .SetRelevantForFunctionEventsOnly()
+      .SetHidden();
 }
 
 }  // namespace gd

Core/GDCore/Extensions/Metadata/BehaviorMetadata.h

@@ -272,7 +272,7 @@ class GD_CORE_API BehaviorMetadata : public InstructionOrExpressionContainerMeta
    * Check if the behavior is private - it can't be used outside of its
    * extension.
    */
-  bool IsPrivate() const { return isPrivate; }
+  bool IsPrivate() const override { return isPrivate; }
 
   /**
    * Set that the behavior is private - it can't be used outside of its

Core/GDCore/Extensions/Metadata/InstructionOrExpressionContainerMetadata.h

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

Core/GDCore/Extensions/Metadata/ObjectMetadata.cpp

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

Core/GDCore/Extensions/Metadata/ObjectMetadata.h

@@ -39,6 +39,8 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
   /**
    * \brief Construct an object metadata, using a "blueprint" object that will
    * be copied when a new object is requested.
+   *
+   * \note This is used for objects declared in JavaScript extensions.
    */
   ObjectMetadata(const gd::String& extensionNamespace_,
                  const gd::String& name_,
@@ -47,9 +49,9 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
                  const gd::String& icon24x24_,
                  std::shared_ptr<gd::ObjectConfiguration> blueprintObject_);
   /**
-   * \brief Construct an object metadata, without "blueprint" object
+   * \brief Construct an object metadata.
    *
-   * \note This is used by events based objects.
+   * \note This is used by events based objects ("custom objects").
    */
   ObjectMetadata(const gd::String& extensionNamespace_,
                  const gd::String& name_,
@@ -60,14 +62,17 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
   /**
    * \brief Construct an object metadata, with a function that will be called
    * to instantiate a new object.
+   *
+   * \note This is used for objects declared in C++ extensions.
    */
   ObjectMetadata(const gd::String& extensionNamespace_,
                  const gd::String& name_,
                  const gd::String& fullname_,
                  const gd::String& description_,
                  const gd::String& icon24x24_,
-                 CreateFunPtr createFunPtrP);
-  ObjectMetadata() : createFunPtr(NULL) {}
+                 CreateFunPtr createFunPtr_);
+
+  ObjectMetadata() {}
   virtual ~ObjectMetadata(){};
 
   /**
@@ -300,6 +305,22 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
    */
   std::map<gd::String, gd::ExpressionMetadata>& GetAllStrExpressions() override { return strExpressionsInfos; };
 
+
+  /**
+   * Check if the behavior is private - it can't be used outside of its
+   * extension.
+   */
+  bool IsPrivate() const override { return isPrivate; }
+
+  /**
+   * Set that the behavior is private - it can't be used outside of its
+   * extension.
+   */
+  ObjectMetadata &SetPrivate() {
+    isPrivate = true;
+    return *this;
+  }
+
   /**
    * \brief Set the object to be hidden in the IDE.
    *
@@ -344,7 +365,7 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
 
   std::vector<gd::String> includeFiles;
   gd::String className;
-  CreateFunPtr createFunPtr;
+  CreateFunPtr createFunPtr = nullptr;
 
  private:
   gd::String extensionNamespace;
@@ -356,6 +377,7 @@ class GD_CORE_API ObjectMetadata : public InstructionOrExpressionContainerMetada
   gd::String iconFilename;
   gd::String categoryFullName;
   std::set<gd::String> defaultBehaviorTypes;
+  bool isPrivate = false;
   bool hidden = false;
   bool isRenderedIn3D = false;
   gd::String openFullEditorLabel;

Core/GDCore/Extensions/Metadata/ParameterMetadataTools.cpp

@@ -33,7 +33,8 @@ void ParameterMetadataTools::ParametersToObjectsContainer(
     const auto& parameter = parameters.GetParameter(i);
     if (parameter.GetName().empty()) continue;
 
-    if (gd::ParameterMetadata::IsObject(parameter.GetType())) {
+    auto &valueTypeMetadata = parameter.GetValueTypeMetadata();
+    if (valueTypeMetadata.IsObject()) {
       const gd::String& objectName = parameter.GetName();
       const gd::String& objectType = parameter.GetExtraInfo();
       allObjectNames.insert(objectName);
@@ -68,7 +69,7 @@ void ParameterMetadataTools::ParametersToObjectsContainer(
       // Search "lastObjectName" in the codebase for other place where this
       // convention is enforced.
       lastObjectName = objectName;
-    } else if (gd::ParameterMetadata::IsBehavior(parameter.GetType())) {
+    } else if (valueTypeMetadata.IsBehavior()) {
       if (!lastObjectName.empty()) {
         if (outputObjectsContainer.HasObjectNamed(lastObjectName)) {
           const gd::String& behaviorName = parameter.GetName();

Core/GDCore/Extensions/Metadata/SourceFileMetadata.h

@@ -0,0 +1,56 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#pragma once
+#include "GDCore/String.h"
+#include "GDCore/Serialization/SerializerElement.h"
+
+namespace gd {
+/**
+ * \brief Contains information about a source file that must be included
+ * when an extension is used.
+ */
+class GD_CORE_API SourceFileMetadata {
+ public:
+  /**
+   * Construct a new dependency metadata, though you probably want to call
+   * `AddSourceFile` on gd::PlatformExtension.
+   *
+   * \see gd::PlatformExtension
+   */
+  SourceFileMetadata() {};
+
+  SourceFileMetadata& SetResourceName(const gd::String& resourceName_) {
+    resourceName = resourceName_;
+    return *this;
+  };
+
+  SourceFileMetadata& SetIncludePosition(const gd::String& includePosition_) {
+    includePosition = includePosition_;
+    return *this;
+  };
+
+  const gd::String& GetResourceName() const { return resourceName; };
+
+  gd::String& GetResourceName() { return resourceName; };
+
+  const gd::String& GetIncludePosition() const { return includePosition; };
+
+  void SerializeTo(SerializerElement& element) const {
+    element.AddChild("resourceName").SetStringValue(resourceName);
+    element.AddChild("includePosition").SetStringValue(includePosition);
+  }
+
+  void UnserializeFrom(const SerializerElement& element) {
+    resourceName = element.GetStringAttribute("resourceName");
+    includePosition = element.GetStringAttribute("includePosition", "last");
+  }
+
+ private:
+  gd::String resourceName;  ///< The name of the resource in the project.
+  gd::String includePosition = "last";  ///< "first" or "last".
+};
+
+}  // namespace gd

Core/GDCore/Extensions/Metadata/ValueTypeMetadata.cpp

@@ -79,6 +79,8 @@ const gd::String ValueTypeMetadata::colorValueType = "color";
 const gd::String ValueTypeMetadata::choiceValueType = "stringWithSelector";
 const gd::String ValueTypeMetadata::behaviorValueType = "behavior";
 const gd::String ValueTypeMetadata::leaderboardIdValueType = "leaderboardId";
+const gd::String ValueTypeMetadata::objectAnimationNameValueType = "objectAnimationName";
+const gd::String ValueTypeMetadata::keyboardKeyValueType = "keyboardKey";
 
 const gd::String &ValueTypeMetadata::ConvertPropertyTypeToValueType(
     const gd::String &propertyType) {
@@ -94,8 +96,12 @@ const gd::String &ValueTypeMetadata::ConvertPropertyTypeToValueType(
     return behaviorValueType;
   } else if (propertyType == "LeaderboardId") {
     return leaderboardIdValueType;
+  } else if (propertyType == "ObjectAnimationName") {
+    return objectAnimationNameValueType;
+  } else if (propertyType == "KeyboardKey") {
+    return keyboardKeyValueType;
   }
-  // For "String" or default
+  // For "String", "Resource", "MultilineString" or default
   return stringValueType;
 };
 

Core/GDCore/Extensions/Metadata/ValueTypeMetadata.h

@@ -129,7 +129,7 @@ class GD_CORE_API ValueTypeMetadata {
   }
 
   /**
-   * \brief Return true if the type of the parameter is a number.
+   * \brief Return true if the type of the parameter is a variable.
    * \note If you had a new type of parameter, also add it in the IDE (
    * see EventsFunctionParametersEditor, ParameterRenderingService
    * and ExpressionAutocompletion) and in the EventsCodeGenerator.
@@ -148,6 +148,19 @@ class GD_CORE_API ValueTypeMetadata {
     return gd::ValueTypeMetadata::GetPrimitiveValueType(type) == "variable";
   }
 
+  /**
+   * \brief Return true if the type of the parameter is a variable and not a
+   * property or a parameter.
+   */
+  bool IsVariableOnly() const {
+      return
+          // Any variable.
+          name == "variable" ||
+          // Old, "pre-scoped" variables:
+          name == "objectvar" || name == "globalvar" ||
+          name == "scenevar";
+  }
+
   /**
    * \brief Return true if the type is a variable but from a specific scope
    * (scene, project or object). In new code, prefer to use the more generic "variable"
@@ -212,15 +225,20 @@ class GD_CORE_API ValueTypeMetadata {
              parameterType == "functionParameterName" ||
              parameterType == "externalLayoutName" ||
              parameterType == "leaderboardId" ||
+             parameterType == "keyboardKey" ||
+             parameterType == "mouseButton" ||
              parameterType == "identifier";
     } else if (type == "boolean") {
       return parameterType == "yesorno" || parameterType == "trueorfalse";
     } else if (type == "variable") {
       return
-             parameterType == "variable" || // Any variable.
-             // Old, "pre-scoped" variables:
-             parameterType == "objectvar" || parameterType == "globalvar" ||
-             parameterType == "scenevar";
+          // Any variable.
+          parameterType == "variable" ||
+          parameterType == "variableOrProperty" ||
+          parameterType == "variableOrPropertyOrParameter" ||
+          // Old, "pre-scoped" variables:
+          parameterType == "objectvar" || parameterType == "globalvar" ||
+          parameterType == "scenevar";
     } else if (type == "resource") {
       return parameterType == "fontResource" ||
              parameterType == "audioResource" ||
@@ -316,6 +334,8 @@ class GD_CORE_API ValueTypeMetadata {
   static const gd::String choiceValueType;
   static const gd::String behaviorValueType;
   static const gd::String leaderboardIdValueType;
+  static const gd::String objectAnimationNameValueType;
+  static const gd::String keyboardKeyValueType;
 };
 
 }  // namespace gd

Core/GDCore/Extensions/Platform.cpp

@@ -38,12 +38,14 @@ bool Platform::AddExtension(std::shared_ptr<gd::PlatformExtension> extension) {
 
   extensionsLoaded.push_back(extension);
 
-  // Load all creation/destruction functions for objects provided by the
-  // extension
+  // Load all creation functions for objects provided by the
+  // extension.
   vector<gd::String> objectsTypes = extension->GetExtensionObjectsTypes();
   for (std::size_t i = 0; i < objectsTypes.size(); ++i) {
-    creationFunctionTable[objectsTypes[i]] =
-        extension->GetObjectCreationFunctionPtr(objectsTypes[i]);
+    CreateFunPtr createFunPtr = extension->GetObjectCreationFunctionPtr(objectsTypes[i]);
+    if (createFunPtr != nullptr) {
+      creationFunctionTable[objectsTypes[i]] = createFunPtr;
+    }
   }
 
   for (const auto& it :
@@ -62,7 +64,9 @@ void Platform::RemoveExtension(const gd::String& name) {
     if (extension->GetName() == name) {
       vector<gd::String> objectsTypes = extension->GetExtensionObjectsTypes();
       for (std::size_t i = 0; i < objectsTypes.size(); ++i) {
-        creationFunctionTable.erase(objectsTypes[i]);
+        if (creationFunctionTable.find(objectsTypes[i]) != creationFunctionTable.end()) {
+          creationFunctionTable.erase(objectsTypes[i]);
+        }
       }
     }
   }

Core/GDCore/Extensions/PlatformExtension.cpp

@@ -18,8 +18,8 @@
 #include "GDCore/Extensions/Platform.h"
 #include "GDCore/IDE/PlatformManager.h"
 #include "GDCore/Project/Behavior.h"
-#include "GDCore/Project/ObjectConfiguration.h"
 #include "GDCore/Project/BehaviorsSharedData.h"
+#include "GDCore/Project/ObjectConfiguration.h"
 #include "GDCore/Tools/Localization.h"
 
 namespace gd {
@@ -200,11 +200,11 @@ PlatformExtension::AddExpressionAndConditionAndAction(
                           group,
                           icon)
           : AddStrExpression(name,
-                              fullname,
-                              expressionDescriptionTemplate.FindAndReplace(
-                                  "<subject>", descriptionSubject),
-                              group,
-                              icon);
+                             fullname,
+                             expressionDescriptionTemplate.FindAndReplace(
+                                 "<subject>", descriptionSubject),
+                             group,
+                             icon);
 
   return MultipleInstructionMetadata::WithExpressionAndConditionAndAction(
       expression, condition, action);
@@ -215,6 +215,11 @@ gd::DependencyMetadata& PlatformExtension::AddDependency() {
   return extensionDependenciesMetadata.back();
 }
 
+gd::SourceFileMetadata& PlatformExtension::AddSourceFile() {
+  extensionSourceFilesMetadata.push_back(SourceFileMetadata());
+  return extensionSourceFilesMetadata.back();
+}
+
 gd::ObjectMetadata& PlatformExtension::AddObject(
     const gd::String& name,
     const gd::String& fullname,
@@ -239,12 +244,10 @@ gd::ObjectMetadata& PlatformExtension::AddEventsBasedObject(
     const gd::String& description,
     const gd::String& icon24x24) {
   gd::String nameWithNamespace = GetNameSpace() + name;
-  objectsInfos[nameWithNamespace] = ObjectMetadata(GetNameSpace(),
-                                                   nameWithNamespace,
-                                                   fullname,
-                                                   description,
-                                                   icon24x24)
-                                        .SetHelpPath(GetHelpPath());
+  objectsInfos[nameWithNamespace] =
+      ObjectMetadata(
+          GetNameSpace(), nameWithNamespace, fullname, description, icon24x24)
+          .SetHelpPath(GetHelpPath());
   return objectsInfos[nameWithNamespace];
 }
 
@@ -348,8 +351,7 @@ gd::BehaviorMetadata& PlatformExtension::GetBehaviorMetadata(
   return badBehaviorMetadata;
 }
 
-bool PlatformExtension::HasBehavior(
-    const gd::String& behaviorType) const {
+bool PlatformExtension::HasBehavior(const gd::String& behaviorType) const {
   return behaviorsInfo.find(behaviorType) != behaviorsInfo.end();
 }
 
@@ -381,7 +383,7 @@ gd::InstructionMetadata& PlatformExtension::AddDuplicatedAction(
   auto copiedAction = actionsInfos.find(copiedNameWithNamespace);
   if (copiedAction == actionsInfos.end()) {
     gd::LogError("Could not find an action with name " +
-                   copiedNameWithNamespace + " to copy.");
+                 copiedNameWithNamespace + " to copy.");
   } else {
     actionsInfos[newNameWithNamespace] = copiedAction->second;
   }
@@ -401,7 +403,7 @@ gd::InstructionMetadata& PlatformExtension::AddDuplicatedCondition(
   auto copiedCondition = conditionsInfos.find(copiedNameWithNamespace);
   if (copiedCondition == conditionsInfos.end()) {
     gd::LogError("Could not find a condition with name " +
-                   copiedNameWithNamespace + " to copy.");
+                 copiedNameWithNamespace + " to copy.");
   } else {
     conditionsInfos[newNameWithNamespace] = copiedCondition->second;
   }
@@ -418,7 +420,7 @@ gd::ExpressionMetadata& PlatformExtension::AddDuplicatedExpression(
   auto copiedExpression = expressionsInfos.find(copiedNameWithNamespace);
   if (copiedExpression == expressionsInfos.end()) {
     gd::LogError("Could not find an expression with name " +
-                   copiedNameWithNamespace + " to copy.");
+                 copiedNameWithNamespace + " to copy.");
   } else {
     expressionsInfos[newNameWithNamespace] = copiedExpression->second;
   }
@@ -435,7 +437,7 @@ gd::ExpressionMetadata& PlatformExtension::AddDuplicatedStrExpression(
   auto copiedExpression = strExpressionsInfos.find(copiedNameWithNamespace);
   if (copiedExpression == strExpressionsInfos.end()) {
     gd::LogError("Could not find a string expression with name " +
-                   copiedNameWithNamespace + " to copy.");
+                 copiedNameWithNamespace + " to copy.");
   } else {
     strExpressionsInfos[newNameWithNamespace] = copiedExpression->second;
   }
@@ -463,10 +465,24 @@ PlatformExtension::GetAllStrExpressions() {
   return strExpressionsInfos;
 }
 
+const std::vector<gd::DependencyMetadata>&
+PlatformExtension::GetAllDependencies() const {
+  return extensionDependenciesMetadata;
+}
+
 std::vector<gd::DependencyMetadata>& PlatformExtension::GetAllDependencies() {
   return extensionDependenciesMetadata;
 }
 
+const std::vector<gd::SourceFileMetadata>&
+PlatformExtension::GetAllSourceFiles() const {
+  return extensionSourceFilesMetadata;
+}
+
+std::vector<gd::SourceFileMetadata>& PlatformExtension::GetAllSourceFiles() {
+  return extensionSourceFilesMetadata;
+}
+
 std::map<gd::String, gd::EventMetadata>& PlatformExtension::GetAllEvents() {
   return eventsInfos;
 }
@@ -598,37 +614,6 @@ void PlatformExtension::SetNameSpace(gd::String nameSpace_) {
   nameSpace = nameSpace_ + GetNamespaceSeparator();
 }
 
-std::vector<gd::String> PlatformExtension::GetBuiltinExtensionsNames() {
-  std::vector<gd::String> builtinExtensions;
-  builtinExtensions.push_back("Sprite");
-  builtinExtensions.push_back("BuiltinObject");
-  builtinExtensions.push_back("BuiltinAudio");
-  builtinExtensions.push_back("BuiltinMouse");
-  builtinExtensions.push_back("BuiltinKeyboard");
-  builtinExtensions.push_back("BuiltinJoystick");
-  builtinExtensions.push_back("BuiltinTime");
-  builtinExtensions.push_back("BuiltinFile");
-  builtinExtensions.push_back("BuiltinVariables");
-  builtinExtensions.push_back("BuiltinCamera");
-  builtinExtensions.push_back("BuiltinWindow");
-  builtinExtensions.push_back("BuiltinNetwork");
-  builtinExtensions.push_back("BuiltinScene");
-  builtinExtensions.push_back("BuiltinAdvanced");
-  builtinExtensions.push_back("BuiltinCommonConversions");
-  builtinExtensions.push_back("BuiltinStringInstructions");
-  builtinExtensions.push_back("BuiltinMathematicalTools");
-  builtinExtensions.push_back("BuiltinExternalLayouts");
-  builtinExtensions.push_back("BuiltinCommonInstructions");
-
-  return builtinExtensions;
-}
-
-bool PlatformExtension::IsBuiltin() const {
-  std::vector<gd::String> builtinExtensions = GetBuiltinExtensionsNames();
-  return std::find(builtinExtensions.begin(), builtinExtensions.end(), name) !=
-         builtinExtensions.end();
-}
-
 void PlatformExtension::StripUnimplementedInstructionsAndExpressions() {
   for (std::map<gd::String, gd::InstructionMetadata>::iterator it =
            GetAllActions().begin();
@@ -774,41 +759,42 @@ void PlatformExtension::StripUnimplementedInstructionsAndExpressions() {
   }
 }
 
-gd::String
-PlatformExtension::GetEventsFunctionFullType(const gd::String &extensionName,
-                                             const gd::String &functionName) {
-  const auto &separator = GetNamespaceSeparator();
+gd::String PlatformExtension::GetEventsFunctionFullType(
+    const gd::String& extensionName, const gd::String& functionName) {
+  const auto& separator = GetNamespaceSeparator();
   return extensionName + separator + functionName;
 }
 
 gd::String PlatformExtension::GetBehaviorEventsFunctionFullType(
-    const gd::String &extensionName, const gd::String &behaviorName,
-    const gd::String &functionName) {
-  const auto &separator = GetNamespaceSeparator();
+    const gd::String& extensionName,
+    const gd::String& behaviorName,
+    const gd::String& functionName) {
+  const auto& separator = GetNamespaceSeparator();
   return extensionName + separator + behaviorName + separator + functionName;
 }
 
-gd::String
-PlatformExtension::GetBehaviorFullType(const gd::String &extensionName,
-                                       const gd::String &behaviorName) {
-  const auto &separator = GetNamespaceSeparator();
+gd::String PlatformExtension::GetBehaviorFullType(
+    const gd::String& extensionName, const gd::String& behaviorName) {
+  const auto& separator = GetNamespaceSeparator();
   return extensionName + separator + behaviorName;
 }
 
 gd::String PlatformExtension::GetObjectEventsFunctionFullType(
-    const gd::String &extensionName, const gd::String &objectName,
-    const gd::String &functionName) {
-  const auto &separator = GetNamespaceSeparator();
+    const gd::String& extensionName,
+    const gd::String& objectName,
+    const gd::String& functionName) {
+  const auto& separator = GetNamespaceSeparator();
   return extensionName + separator + objectName + separator + functionName;
 }
 
-gd::String PlatformExtension::GetObjectFullType(const gd::String &extensionName,
-                                                const gd::String &objectName) {
-  const auto &separator = GetNamespaceSeparator();
+gd::String PlatformExtension::GetObjectFullType(const gd::String& extensionName,
+                                                const gd::String& objectName) {
+  const auto& separator = GetNamespaceSeparator();
   return extensionName + separator + objectName;
 }
 
-gd::String PlatformExtension::GetExtensionFromFullObjectType(const gd::String& type) {
+gd::String PlatformExtension::GetExtensionFromFullObjectType(
+    const gd::String& type) {
   const auto separatorIndex =
       type.find(PlatformExtension::GetNamespaceSeparator());
   if (separatorIndex == std::string::npos) {
@@ -817,7 +803,8 @@ gd::String PlatformExtension::GetExtensionFromFullObjectType(const gd::String& t
   return type.substr(0, separatorIndex);
 }
 
-gd::String PlatformExtension::GetObjectNameFromFullObjectType(const gd::String& type) {
+gd::String PlatformExtension::GetObjectNameFromFullObjectType(
+    const gd::String& type) {
   const auto separatorIndex =
       type.find(PlatformExtension::GetNamespaceSeparator());
   if (separatorIndex == std::string::npos) {

Core/GDCore/Extensions/PlatformExtension.h

@@ -17,6 +17,7 @@
 #include "GDCore/Extensions/Metadata/EventMetadata.h"
 #include "GDCore/Extensions/Metadata/InstructionOrExpressionGroupMetadata.h"
 #include "GDCore/Extensions/Metadata/ObjectMetadata.h"
+#include "GDCore/Extensions/Metadata/SourceFileMetadata.h"
 #include "GDCore/Project/PropertyDescriptor.h"
 #include "GDCore/String.h"
 #include "GDCore/Tools/VersionPriv.h"
@@ -214,6 +215,7 @@ class GD_CORE_API PlatformExtension {
       const gd::String& icon);
 
   gd::DependencyMetadata& AddDependency();
+  gd::SourceFileMetadata& AddSourceFile();
 
   /**
    * \brief Declare a new object as being part of the extension.
@@ -438,12 +440,6 @@ class GD_CORE_API PlatformExtension {
    */
   bool IsDeprecated() const { return deprecated; }
 
-  /**
-   * \brief Return true if the extension is a standard extension that cannot be
-   * deactivated
-   */
-  bool IsBuiltin() const;
-
   /**
    * \brief Get the namespace of the extension.
    * \note The namespace is simply the name of the extension concatenated with
@@ -552,6 +548,24 @@ class GD_CORE_API PlatformExtension {
    */
   std::vector<gd::DependencyMetadata>& GetAllDependencies();
 
+  /**
+   * \brief Return a reference to a vector containing the metadata of all the
+   * dependencies of the extension.
+   */
+  const std::vector<gd::DependencyMetadata>& GetAllDependencies() const;
+
+  /**
+   * \brief Return a reference to a vector containing the metadata of all the
+   * dependencies of the extension.
+   */
+  std::vector<gd::SourceFileMetadata>& GetAllSourceFiles();
+
+  /**
+   * \brief Return a reference to a vector containing the metadata of all the
+   * dependencies of the extension.
+   */
+  const std::vector<gd::SourceFileMetadata>& GetAllSourceFiles() const;
+
   /**
    * \brief Return a reference to a map containing the names of the actions,
    * related to the object type, and the metadata associated with.
@@ -620,12 +634,6 @@ class GD_CORE_API PlatformExtension {
   }
   ///@}
 
-  /**
-   * \brief Return the name of all the extensions which are considered provided
-   * by platforms.
-   */
-  static std::vector<gd::String> GetBuiltinExtensionsNames();
-
   /**
    * \brief Get the string used to separate the name of the
    * instruction/expression and the extension.
@@ -687,6 +695,7 @@ class GD_CORE_API PlatformExtension {
   std::map<gd::String, gd::ExpressionMetadata> expressionsInfos;
   std::map<gd::String, gd::ExpressionMetadata> strExpressionsInfos;
   std::vector<gd::DependencyMetadata> extensionDependenciesMetadata;
+  std::vector<gd::SourceFileMetadata> extensionSourceFilesMetadata;
   std::map<gd::String, gd::EventMetadata> eventsInfos;
   std::map<gd::String, gd::PropertyDescriptor> extensionPropertiesMetadata;
   std::map<gd::String, InstructionOrExpressionGroupMetadata>

Core/GDCore/IDE/DependenciesAnalyzer.cpp

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

Core/GDCore/IDE/DependenciesAnalyzer.h

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

Core/GDCore/IDE/Events/EventsParameterReplacer.cpp

@@ -141,7 +141,7 @@ class GD_CORE_API ExpressionParameterReplacer
           parameterMetadata->GetValueTypeMetadata();
       if (gd::EventsParameterReplacer::CanContainParameter(
               parameterTypeMetadata)) {
-        isParentTypeAVariable = parameterTypeMetadata.IsVariable();
+        isParentTypeAVariable = parameterTypeMetadata.IsVariableOnly();
         parameter->Visit(*this);
       }
     }
@@ -197,7 +197,7 @@ bool EventsParameterReplacer::DoVisitInstruction(gd::Instruction& instruction,
         if (node) {
           ExpressionParameterReplacer renamer(
               platform, GetProjectScopedContainers(),
-              parameterMetadata.GetValueTypeMetadata().IsVariable(),
+              parameterMetadata.GetValueTypeMetadata().IsVariableOnly(),
               oldToNewPropertyNames);
           node->Visit(renamer);
 
@@ -221,7 +221,7 @@ bool EventsParameterReplacer::DoVisitEventExpression(
   if (node) {
     ExpressionParameterReplacer renamer(
         platform, GetProjectScopedContainers(),
-        metadata.GetValueTypeMetadata().IsVariable(), oldToNewPropertyNames);
+        metadata.GetValueTypeMetadata().IsVariableOnly(), oldToNewPropertyNames);
     node->Visit(renamer);
 
     if (renamer.HasDoneRenaming()) {

Core/GDCore/IDE/Events/EventsPropertyReplacer.cpp

@@ -168,7 +168,7 @@ class GD_CORE_API ExpressionPropertyReplacer
           parameterMetadata->GetValueTypeMetadata();
       if (gd::EventsPropertyReplacer::CanContainProperty(
               parameterTypeMetadata)) {
-        isParentTypeAVariable = parameterTypeMetadata.IsVariable();
+        isParentTypeAVariable = parameterTypeMetadata.IsVariableOnly();
         parameter->Visit(*this);
       }
     }
@@ -231,7 +231,7 @@ bool EventsPropertyReplacer::DoVisitInstruction(gd::Instruction& instruction,
         if (node) {
           ExpressionPropertyReplacer renamer(
               platform, GetProjectScopedContainers(), targetPropertiesContainer,
-              parameterMetadata.GetValueTypeMetadata().IsVariable(),
+              parameterMetadata.GetValueTypeMetadata().IsVariableOnly(),
               oldToNewPropertyNames, removedPropertyNames);
           node->Visit(renamer);
 
@@ -257,7 +257,7 @@ bool EventsPropertyReplacer::DoVisitEventExpression(
   if (node) {
     ExpressionPropertyReplacer renamer(
         platform, GetProjectScopedContainers(), targetPropertiesContainer,
-        metadata.GetValueTypeMetadata().IsVariable(), oldToNewPropertyNames,
+        metadata.GetValueTypeMetadata().IsVariableOnly(), oldToNewPropertyNames,
         removedPropertyNames);
     node->Visit(renamer);
 

Core/GDCore/IDE/Events/EventsVariableInstructionTypeSwitcher.cpp

@@ -71,13 +71,18 @@ bool EventsVariableInstructionTypeSwitcher::DoVisitInstruction(gd::Instruction&
                     .GetObjectsContainersList()
                     .GetObjectOrGroupVariablesContainer(lastObjectName);
           }
+        } else if (type == "variableOrProperty") {
+            variablesContainer =
+                &GetProjectScopedContainers()
+                      .GetVariablesContainersList()
+                      .GetVariablesContainerFromVariableOrPropertyName(variableName);
         } else {
           if (GetProjectScopedContainers().GetVariablesContainersList().Has(
                   variableName)) {
             variablesContainer =
                 &GetProjectScopedContainers()
                       .GetVariablesContainersList()
-                      .GetVariablesContainerFromVariableName(variableName);
+                      .GetVariablesContainerFromVariableOrPropertyOrParameterName(variableName);
           }
         }
 

Core/GDCore/IDE/Events/EventsVariableReplacer.cpp

@@ -122,7 +122,7 @@ class GD_CORE_API ExpressionVariableReplacer
         [&]() {
           // This is a variable.
           if (&projectScopedContainers.GetVariablesContainersList()
-                   .GetVariablesContainerFromVariableName(node.name) ==
+                   .GetVariablesContainerFromVariableOrPropertyOrParameterName(node.name) ==
               &targetVariablesContainer) {
             // The node represents a variable, that can come from the target
             // (because the target is in the scope), replace or remove it:
@@ -235,7 +235,7 @@ class GD_CORE_API ExpressionVariableReplacer
         [&]() {
           // This is a variable.
           if (&projectScopedContainers.GetVariablesContainersList()
-                   .GetVariablesContainerFromVariableName(
+                   .GetVariablesContainerFromVariableOrPropertyOrParameterName(
                        node.identifierName) == &targetVariablesContainer) {
             // The node represents a variable, that can come from the target
             // (because the target is in the scope), replace or remove it:

Core/GDCore/IDE/Events/EventsVariableReplacer.h

@@ -73,6 +73,7 @@ class GD_CORE_API EventsVariableReplacer
    */
   const gd::String targetGroupName;
   const VariablesRenamingChangesetNode &variablesRenamingChangesetRoot;
+  // TODO There is no reason de delete events. This dead code should be removed.
   const std::unordered_set<gd::String> &removedVariableNames;
 
   static VariablesContainer nullVariablesContainer;

Core/GDCore/IDE/Events/ExampleExtensionUsagesFinder.cpp

@@ -0,0 +1,235 @@
+#include "ExampleExtensionUsagesFinder.h"
+
+#include "GDCore/Events/Instruction.h"
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+#include "GDCore/Extensions/Metadata/ParameterMetadataTools.h"
+#include "GDCore/Extensions/PlatformExtension.h"
+#include "GDCore/IDE/Events/ExpressionTypeFinder.h"
+#include "GDCore/IDE/ProjectBrowserHelper.h"
+#include "GDCore/IDE/WholeProjectRefactorer.h"
+#include "GDCore/Project/Behavior.h"
+#include "GDCore/Project/EventsFunctionsExtension.h"
+#include "GDCore/Project/Object.h"
+#include "GDCore/Project/Project.h"
+
+namespace gd {
+
+std::set<gd::String>
+ExampleExtensionUsagesFinder::GetUsedExtensions(gd::Project &project) {
+  ExampleExtensionUsagesFinder worker(project);
+  gd::ProjectBrowserHelper::ExposeProjectObjects(project, worker);
+  gd::ProjectBrowserHelper::ExposeProjectEventsWithoutExtensions(project,
+                                                                 worker);
+
+  for (std::size_t e = 0; e < project.GetEventsFunctionsExtensionsCount();
+       e++) {
+    auto &eventsFunctionsExtension = project.GetEventsFunctionsExtension(e);
+    worker.isStoreExtension =
+        eventsFunctionsExtension.GetOriginName() == "gdevelop-extension-store";
+    ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(
+        project, eventsFunctionsExtension, worker);
+  }
+  if (!worker.has3DObjects) {
+    worker.usedExtensions.erase("Scene3D");
+  }
+  return worker.usedExtensions;
+};
+
+void ExampleExtensionUsagesFinder::AddUsedExtension(
+    const gd::PlatformExtension &extension) {
+  usedExtensions.insert(extension.GetName());
+}
+
+void ExampleExtensionUsagesFinder::AddUsedBuiltinExtension(
+    const gd::String &extensionName) {
+  usedExtensions.insert(extensionName);
+}
+
+// Objects scanner
+
+void ExampleExtensionUsagesFinder::DoVisitObject(gd::Object &object) {
+  auto metadata = gd::MetadataProvider::GetExtensionAndObjectMetadata(
+      project.GetCurrentPlatform(), object.GetType());
+  if (metadata.GetMetadata().IsRenderedIn3D()) {
+    has3DObjects = true;
+  }
+  AddUsedExtension(metadata.GetExtension());
+};
+
+// Behaviors scanner
+
+void ExampleExtensionUsagesFinder::DoVisitBehavior(gd::Behavior &behavior) {
+  auto metadata = gd::MetadataProvider::GetExtensionAndBehaviorMetadata(
+      project.GetCurrentPlatform(), behavior.GetTypeName());
+  AddUsedExtension(metadata.GetExtension());
+};
+
+// Instructions scanner
+
+bool ExampleExtensionUsagesFinder::DoVisitInstruction(
+    gd::Instruction &instruction, bool isCondition) {
+  auto metadata =
+      isCondition ? gd::MetadataProvider::GetExtensionAndConditionMetadata(
+                        project.GetCurrentPlatform(), instruction.GetType())
+                  : gd::MetadataProvider::GetExtensionAndActionMetadata(
+                        project.GetCurrentPlatform(), instruction.GetType());
+  // Unused event-based objects or events-based behaviors may use object and
+  // behavior instructions that should not be detected as extension usage.
+  // The extension of actually used objects and behaviors will be detected on
+  // scene objects. This is why object or behavior instructions usually don't
+  // have any import.
+  // Built-in extensions that are included by default don't declare any include
+  // files on their instructions either. To still detect their usage, we
+  // consider that main events and dedicated extensions can't have dead code.
+  if (!isStoreExtension || !metadata.GetMetadata().GetIncludeFiles().empty()) {
+    AddUsedExtension(metadata.GetExtension());
+  }
+
+  gd::ParameterMetadataTools::IterateOverParameters(
+      instruction.GetParameters(), metadata.GetMetadata().GetParameters(),
+      [this](const gd::ParameterMetadata &parameterMetadata,
+             const gd::Expression &parameterValue,
+             const gd::String &lastObjectName) {
+        const gd::String &parameterType = parameterMetadata.GetType();
+
+        if (gd::ParameterMetadata::IsExpression("string", parameterType)) {
+          rootType = "string";
+          parameterValue.GetRootNode()->Visit(*this);
+        } else if (gd::ParameterMetadata::IsExpression("number",
+                                                       parameterType)) {
+          rootType = "number";
+          parameterValue.GetRootNode()->Visit(*this);
+        } else if (gd::ParameterMetadata::IsExpression("variable",
+                                                       parameterType))
+          AddUsedBuiltinExtension("BuiltinVariables");
+      });
+
+  return false;
+}
+
+// Expressions scanner
+
+// Ignore literals nodes
+void ExampleExtensionUsagesFinder::OnVisitNumberNode(NumberNode &node){};
+void ExampleExtensionUsagesFinder::OnVisitTextNode(TextNode &node){};
+
+// Ignore nodes without valid extensions
+void ExampleExtensionUsagesFinder::OnVisitEmptyNode(EmptyNode &node){};
+void ExampleExtensionUsagesFinder::OnVisitObjectFunctionNameNode(
+    ObjectFunctionNameNode &node){};
+
+// Visit sub-expressions
+void ExampleExtensionUsagesFinder::OnVisitSubExpressionNode(
+    SubExpressionNode &node) {
+  node.expression->Visit(*this);
+};
+
+void ExampleExtensionUsagesFinder::OnVisitOperatorNode(OperatorNode &node) {
+  node.leftHandSide->Visit(*this);
+  node.rightHandSide->Visit(*this);
+};
+
+void ExampleExtensionUsagesFinder::OnVisitUnaryOperatorNode(
+    UnaryOperatorNode &node) {
+  node.factor->Visit(*this);
+};
+
+// Add variable extension and visit sub-expressions on variable nodes
+void ExampleExtensionUsagesFinder::OnVisitVariableNode(VariableNode &node) {
+  AddUsedBuiltinExtension("BuiltinVariables");
+
+  auto type = gd::ExpressionTypeFinder::GetType(project.GetCurrentPlatform(),
+                                                GetProjectScopedContainers(),
+                                                rootType, node);
+
+  if (gd::ParameterMetadata::IsExpression("variable", type)) {
+    // Nothing to do (this can't reference an object)
+  } else {
+    GetProjectScopedContainers().MatchIdentifierWithName<void>(
+        node.name,
+        [&]() {
+          // This represents an object.
+          auto metadata = gd::MetadataProvider::GetExtensionAndObjectMetadata(
+              project.GetCurrentPlatform(), node.name);
+          AddUsedExtension(metadata.GetExtension());
+        },
+        [&]() {
+          // This is a variable.
+        },
+        [&]() {
+          // This is a property.
+        },
+        [&]() {
+          // This is a parameter.
+        },
+        [&]() {
+          // This is something else.
+        });
+  }
+
+  if (node.child)
+    node.child->Visit(*this);
+};
+
+void ExampleExtensionUsagesFinder::OnVisitVariableAccessorNode(
+    VariableAccessorNode &node) {
+  AddUsedBuiltinExtension("BuiltinVariables");
+  if (node.child)
+    node.child->Visit(*this);
+};
+
+void ExampleExtensionUsagesFinder::OnVisitVariableBracketAccessorNode(
+    VariableBracketAccessorNode &node) {
+  AddUsedBuiltinExtension("BuiltinVariables");
+  node.expression->Visit(*this);
+  if (node.child)
+    node.child->Visit(*this);
+};
+
+// Add extensions bound to Objects/Behaviors/Functions
+void ExampleExtensionUsagesFinder::OnVisitIdentifierNode(IdentifierNode &node) {
+  auto type = gd::ExpressionTypeFinder::GetType(project.GetCurrentPlatform(),
+                                                GetProjectScopedContainers(),
+                                                rootType, node);
+  if (gd::ParameterMetadata::IsObject(type) ||
+      GetObjectsContainersList().HasObjectOrGroupNamed(node.identifierName)) {
+    // An object or object variable is used.
+    auto metadata = gd::MetadataProvider::GetExtensionAndObjectMetadata(
+        project.GetCurrentPlatform(), node.identifierName);
+    AddUsedExtension(metadata.GetExtension());
+  }
+};
+
+void ExampleExtensionUsagesFinder::OnVisitFunctionCallNode(
+    FunctionCallNode &node) {
+  // Extensions of non-free functions are already found when scanning objects.
+  if (!(node.objectName.empty() && node.behaviorName.empty()))
+    return;
+  gd::ExtensionAndMetadata<gd::ExpressionMetadata> metadata;
+
+  // Try to find a free number expression
+  metadata = gd::MetadataProvider::GetExtensionAndExpressionMetadata(
+      project.GetCurrentPlatform(), node.functionName);
+  if (gd::MetadataProvider::IsBadExpressionMetadata(metadata.GetMetadata())) {
+    // Try to find a free str expression
+    metadata = gd::MetadataProvider::GetExtensionAndStrExpressionMetadata(
+        project.GetCurrentPlatform(), node.functionName);
+    // No valid expression found, return.
+    if (gd::MetadataProvider::IsBadExpressionMetadata(metadata.GetMetadata()))
+      return;
+  }
+
+  // Unused event-based objects or events-based behaviors may use object and
+  // behavior expressions that should not be detected as extension usage.
+  // The extension of actually used objects and behaviors will be detected on
+  // scene objects. This is why object or behavior expressions usually don't
+  // have any import.
+  // Built-in extensions that are included by default don't declare any include
+  // files on their instructions either. To still detect their usage, we
+  // consider that main events and dedicated extensions can't have dead code.
+  if (!isStoreExtension || !metadata.GetMetadata().GetIncludeFiles().empty()) {
+    AddUsedExtension(metadata.GetExtension());
+  }
+};
+
+} // namespace gd

Core/GDCore/IDE/Events/ExampleExtensionUsagesFinder.h

@@ -0,0 +1,77 @@
+/*
+ * 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 <set>
+
+#include "GDCore/Events/Parsers/ExpressionParser2NodeWorker.h"
+#include "GDCore/Extensions/Metadata/SourceFileMetadata.h"
+#include "GDCore/Extensions/PlatformExtension.h"
+#include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
+#include "GDCore/IDE/Project/ArbitraryObjectsWorker.h"
+#include "GDCore/String.h"
+
+namespace gd {
+class Project;
+class Object;
+class Behavior;
+} // namespace gd
+
+namespace gd {
+
+/**
+ * @brief List extension usages for generated example web-pages.
+ * 
+ * Dependency transitivity is not ensured (see UsedExtensionsFinder).
+ */
+class GD_CORE_API ExampleExtensionUsagesFinder
+    : public ArbitraryObjectsWorker,
+      public ArbitraryEventsWorkerWithContext,
+      public ExpressionParser2NodeWorker {
+public:
+  static std::set<gd::String> GetUsedExtensions(gd::Project &project);
+
+private:
+  ExampleExtensionUsagesFinder(gd::Project &project_) : project(project_){};
+  gd::Project &project;
+  gd::String rootType;
+  bool isStoreExtension = false;
+
+  // Result
+  std::set<gd::String> usedExtensions;
+  bool has3DObjects = false;
+
+  void AddUsedExtension(const gd::PlatformExtension &extension);
+  void AddUsedBuiltinExtension(const gd::String &extensionName);
+
+  // Object Visitor
+  void DoVisitObject(gd::Object &object) override;
+
+  // Behavior Visitor
+  void DoVisitBehavior(gd::Behavior &behavior) override;
+
+  // Instructions Visitor
+  bool DoVisitInstruction(gd::Instruction &instruction,
+                          bool isCondition) override;
+
+  // Expression Visitor
+  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;
+  void OnVisitVariableAccessorNode(VariableAccessorNode &node) override;
+  void OnVisitVariableBracketAccessorNode(
+      VariableBracketAccessorNode &node) override;
+  void OnVisitIdentifierNode(IdentifierNode &node) override;
+  void OnVisitObjectFunctionNameNode(ObjectFunctionNameNode &node) override;
+  void OnVisitFunctionCallNode(FunctionCallNode &node) override;
+  void OnVisitEmptyNode(EmptyNode &node) override;
+};
+
+}; // namespace gd

Core/GDCore/IDE/Events/ExpressionCompletionFinder.h

@@ -1034,7 +1034,7 @@ class GD_CORE_API ExpressionCompletionFinder
           description.SetVariableType(variable.GetType());
           description.SetVariableScope(
               projectScopedContainers.GetVariablesContainersList()
-                  .GetVariablesContainerFromVariableName(variableName)
+                  .GetVariablesContainerFromVariableOrPropertyOrParameterName(variableName)
                   .GetSourceType());
           completions.push_back(description);
 
@@ -1086,7 +1086,7 @@ class GD_CORE_API ExpressionCompletionFinder
           description.SetVariableType(variable.GetType());
           description.SetVariableScope(
               projectScopedContainers.GetVariablesContainersList()
-                  .GetVariablesContainerFromVariableName(variableName)
+                  .GetVariablesContainerFromVariableOrPropertyOrParameterName(variableName)
                   .GetSourceType());
           completions.push_back(description);
 

Core/GDCore/IDE/Events/ExpressionValidator.cpp

@@ -460,10 +460,12 @@ const gd::String& ExpressionValidator::TypeToString(Type type) {
     case Type::NumberOrString:
       return numberOrStringTypeString;
     case Type::Variable:
-      return variableTypeString;
+      // This function is only used to display errors.
+      // Users don't care if it's legacy or not or
+      // if it allows properties and parameters.
+    case Type::VariableOrProperty:
+    case Type::VariableOrPropertyOrParameter:
     case Type::LegacyVariable:
-      // This function is only used to display error.
-      // Users don't care if it's legacy or not.
       return variableTypeString;
     case Type::Object:
       return objectTypeString;
@@ -493,8 +495,11 @@ ExpressionValidator::Type ExpressionValidator::StringToType(
           ExpressionValidator::variableTypeString, type)) {
     if (gd::ValueTypeMetadata::IsTypeLegacyPreScopedVariable(type)) {
       return Type::LegacyVariable;
-    }
-    else {
+    } else if (type == "variableOrProperty") {
+      return Type::VariableOrProperty;
+    } else if (type == "variableOrPropertyOrParameter") {
+      return Type::VariableOrPropertyOrParameter;
+    } else {
       return Type::Variable;
     }
   }

Core/GDCore/IDE/Events/ExpressionValidator.h

@@ -203,10 +203,12 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
   void OnVisitVariableNode(VariableNode& node) override {
     ReportAnyError(node);
 
-    if (parentType == Type::Variable) {
+    if (parentType == Type::Variable ||
+        parentType == Type::VariableOrProperty ||
+        parentType == Type::VariableOrPropertyOrParameter) {
       childType = parentType;
 
-      CheckVariableExistence(node.location, node.name);
+      CheckVariableExistence(node.location, node.name, node.child != nullptr);
       if (node.child) {
         node.child->Visit(*this);
       }
@@ -216,7 +218,8 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
       if (node.child) {
         node.child->Visit(*this);
       }
-    } else if (parentType == Type::String || parentType == Type::Number || parentType == Type::NumberOrString) {
+    } else if (parentType == Type::String || parentType == Type::Number ||
+               parentType == Type::NumberOrString) {
       // The node represents a variable or an object variable in an expression waiting for its *value* to be returned.
       childType = parentType;
 
@@ -336,11 +339,12 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
             _("You must enter a number or a text, wrapped inside double quotes (example: \"Hello world\"), or a variable name."),
             node.location);
       }
-    }
-    else if (parentType == Type::Variable) {
-      CheckVariableExistence(node.location, node.identifierName);
-    }
-    else if (parentType != Type::Object && parentType != Type::LegacyVariable) {
+    } else if (parentType == Type::Variable ||
+               parentType == Type::VariableOrProperty ||
+               parentType == Type::VariableOrPropertyOrParameter) {
+      CheckVariableExistence(node.location, node.identifierName, !node.childIdentifierName.empty());
+    } else if (parentType != Type::Object &&
+               parentType != Type::LegacyVariable) {
       // It can't happen.
       RaiseTypeError(
           _("You've entered a name, but this type was expected:") + " " + TypeToString(parentType),
@@ -376,8 +380,19 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
     childType = Type::Empty;
   }
 
- private:
-  enum Type {Unknown = 0, Number, String, NumberOrString, Variable, LegacyVariable, Object, Empty};
+private:
+  enum Type {
+    Unknown = 0,
+    Number,
+    String,
+    NumberOrString,
+    Variable,
+    LegacyVariable,
+    Object,
+    Empty,
+    VariableOrProperty,
+    VariableOrPropertyOrParameter
+  };
   Type ValidateFunction(const gd::FunctionCallNode& function);
   bool ValidateObjectVariableOrVariableOrProperty(const gd::IdentifierNode& identifier);
   bool ValidateObjectVariableOrVariableOrProperty(
@@ -386,8 +401,10 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
       const gd::String &childIdentifierName,
       const gd::ExpressionParserLocation childIdentifierNameLocation);
 
-  void CheckVariableExistence(const ExpressionParserLocation &location, const gd::String& name) {
-    if (!currentParameterExtraInfo || *currentParameterExtraInfo != "AllowUndeclaredVariable") {
+  void CheckVariableExistence(const ExpressionParserLocation &location,
+                              const gd::String &name, bool hasChild) {
+    if (!currentParameterExtraInfo ||
+        *currentParameterExtraInfo != "AllowUndeclaredVariable") {
       projectScopedContainers.MatchIdentifierWithName<void>(
           name,
           [&]() {
@@ -402,19 +419,28 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
           },
           [&]() {
             // This is a property.
-            // This error won't happen unless the priority is changed.
-            RaiseVariableNameCollisionError(
-                _("This variable has the same name as a property. Consider "
-                  "renaming one or the other."),
-                location, name);
+            if (parentType != Type::VariableOrProperty &&
+                parentType != Type::VariableOrPropertyOrParameter) {
+              RaiseVariableNameCollisionError(
+                  _("This variable has the same name as a property. Consider "
+                    "renaming one or the other."),
+                  location, name);
+            } else if (hasChild) {
+              RaiseMalformedVariableParameter(
+                  _("Properties can't have children."), location, name);
+            }
           },
           [&]() {
             // This is a parameter.
-            // This error won't happen unless the priority is changed.
-            RaiseVariableNameCollisionError(
-                _("This variable has the same name as a parameter. Consider "
-                  "renaming one or the other."),
-                location, name);
+            if (parentType != Type::VariableOrPropertyOrParameter) {
+              RaiseVariableNameCollisionError(
+                  _("This variable has the same name as a parameter. Consider "
+                    "renaming one or the other."),
+                  location, name);
+            } else if (hasChild) {
+              RaiseMalformedVariableParameter(
+                  _("Properties can't have children."), location, name);
+            }
           },
           [&]() {
             // This is something else.
@@ -476,6 +502,13 @@ class GD_CORE_API ExpressionValidator : public ExpressionParser2NodeWorker {
                message, location, false, variableName, objectName);
   }
 
+  void RaiseMalformedVariableParameter(const gd::String &message,
+                                   const ExpressionParserLocation &location,
+                                   const gd::String &variableName) {
+    RaiseError(gd::ExpressionParserError::ErrorType::MalformedVariableParameter,
+               message, location, true, variableName, "");
+  }
+
   void RaiseTypeError(const gd::String &message,
                       const ExpressionParserLocation &location,
                       bool isFatal = true) {

Core/GDCore/IDE/Events/ExpressionVariablePathFinder.h

@@ -215,7 +215,7 @@ class GD_CORE_API ExpressionVariablePathFinder
             if (projectScopedContainers.GetVariablesContainersList().Has(identifier)) {
               variablesContainer =
                   &(projectScopedContainers.GetVariablesContainersList()
-                        .GetVariablesContainerFromVariableName(identifier));
+                        .GetVariablesContainerFromVariableOrPropertyOrParameterName(identifier));
               variableName = identifier;
               if (childIdentifier) {
                 childVariableNames.push_back(*childIdentifier);
@@ -223,12 +223,28 @@ class GD_CORE_API ExpressionVariablePathFinder
             }
           },
           [&]() {
-            // Ignore properties here.
-            // There is no support for "children" of properties.
+            // This is a property.
+            if (parameterType != "objectvar" &&
+                    projectScopedContainers.GetVariablesContainersList().Has(
+                        identifier)) {
+              variablesContainer =
+                  &(projectScopedContainers.GetVariablesContainersList()
+                        .GetVariablesContainerFromVariableOrPropertyOrParameterName(identifier));
+              variableName = identifier;
+              // There is no support for "children" of properties.
+            }
           },
           [&]() {
-            // Ignore parameters here.
-            // There is no support for "children" of parameters.
+            // This is a parameter.
+            if (parameterType != "objectvar" &&
+                projectScopedContainers.GetVariablesContainersList().Has(
+                    identifier)) {
+              variablesContainer =
+                  &(projectScopedContainers.GetVariablesContainersList()
+                        .GetVariablesContainerFromVariableOrPropertyOrParameterName(identifier));
+              variableName = identifier;
+              // There is no support for "children" of parameters.
+            }
           },
           [&]() {
             // Ignore unrecognised identifiers here.

Core/GDCore/IDE/Events/UsedExtensionsFinder.cpp

@@ -13,6 +13,18 @@
 
 namespace gd {
 
+void UsedExtensionsResult::AddUsedExtension(const gd::PlatformExtension& extension) {
+  usedExtensions.insert(extension.GetName());
+
+  usedSourceFiles.insert(usedSourceFiles.end(),
+                         extension.GetAllSourceFiles().begin(),
+                         extension.GetAllSourceFiles().end());
+}
+
+void UsedExtensionsResult::AddUsedBuiltinExtension(const gd::String& extensionName) {
+  usedExtensions.insert(extensionName);
+}
+
 const UsedExtensionsResult UsedExtensionsFinder::ScanProject(gd::Project& project) {
   UsedExtensionsFinder worker(project);
   gd::ProjectBrowserHelper::ExposeProjectObjects(project, worker);
@@ -28,9 +40,9 @@ void UsedExtensionsFinder::DoVisitObject(gd::Object &object) {
   if (metadata.GetMetadata().IsRenderedIn3D()) {
     result.MarkAsHaving3DObjects();
   }
-  result.GetUsedExtensions().insert(metadata.GetExtension().GetName());
+  result.AddUsedExtension(metadata.GetExtension());
   for (auto &&includeFile : metadata.GetMetadata().includeFiles) {
-    result.GetUsedIncludeFiles().insert(includeFile);
+    result.AddUsedIncludeFiles(includeFile);
   }
 };
 
@@ -39,12 +51,12 @@ void UsedExtensionsFinder::DoVisitObject(gd::Object &object) {
 void UsedExtensionsFinder::DoVisitBehavior(gd::Behavior &behavior) {
   auto metadata = gd::MetadataProvider::GetExtensionAndBehaviorMetadata(
       project.GetCurrentPlatform(), behavior.GetTypeName());
-  result.GetUsedExtensions().insert(metadata.GetExtension().GetName());
+  result.AddUsedExtension(metadata.GetExtension());
   for (auto &&includeFile : metadata.GetMetadata().includeFiles) {
-    result.GetUsedIncludeFiles().insert(includeFile);
+    result.AddUsedIncludeFiles(includeFile);
   }
   for (auto &&includeFile : metadata.GetMetadata().requiredFiles) {
-    result.GetUsedRequiredFiles().insert(includeFile);
+    result.AddUsedRequiredFiles(includeFile);
   }
 };
 
@@ -57,9 +69,9 @@ bool UsedExtensionsFinder::DoVisitInstruction(gd::Instruction& instruction,
                         project.GetCurrentPlatform(), instruction.GetType())
                   : gd::MetadataProvider::GetExtensionAndActionMetadata(
                         project.GetCurrentPlatform(), instruction.GetType());
-  result.GetUsedExtensions().insert(metadata.GetExtension().GetName());
+  result.AddUsedExtension(metadata.GetExtension());
   for (auto&& includeFile : metadata.GetMetadata().GetIncludeFiles()) {
-    result.GetUsedIncludeFiles().insert(includeFile);
+    result.AddUsedIncludeFiles(includeFile);
   }
 
   gd::ParameterMetadataTools::IterateOverParameters(
@@ -77,7 +89,7 @@ bool UsedExtensionsFinder::DoVisitInstruction(gd::Instruction& instruction,
       rootType = "number";
       parameterValue.GetRootNode()->Visit(*this);
     } else if (gd::ParameterMetadata::IsExpression("variable", parameterType))
-      result.GetUsedExtensions().insert("BuiltinVariables");
+      result.AddUsedBuiltinExtension("BuiltinVariables");
   });
 
   return false;
@@ -110,7 +122,7 @@ void UsedExtensionsFinder::OnVisitUnaryOperatorNode(UnaryOperatorNode& node) {
 
 // Add variable extension and visit sub-expressions on variable nodes
 void UsedExtensionsFinder::OnVisitVariableNode(VariableNode& node) {
-  result.GetUsedExtensions().insert("BuiltinVariables");
+  result.AddUsedBuiltinExtension("BuiltinVariables");
 
   auto type = gd::ExpressionTypeFinder::GetType(
       project.GetCurrentPlatform(), GetProjectScopedContainers(), rootType, node);
@@ -123,9 +135,9 @@ void UsedExtensionsFinder::OnVisitVariableNode(VariableNode& node) {
         // This represents an object.
         auto metadata = gd::MetadataProvider::GetExtensionAndObjectMetadata(
           project.GetCurrentPlatform(), node.name);
-        result.GetUsedExtensions().insert(metadata.GetExtension().GetName());
+        result.AddUsedExtension(metadata.GetExtension());
         for (auto &&includeFile : metadata.GetMetadata().includeFiles) {
-          result.GetUsedIncludeFiles().insert(includeFile);
+          result.AddUsedIncludeFiles(includeFile);
         }
       }, [&]() {
         // This is a variable.
@@ -143,13 +155,13 @@ void UsedExtensionsFinder::OnVisitVariableNode(VariableNode& node) {
 
 void UsedExtensionsFinder::OnVisitVariableAccessorNode(
     VariableAccessorNode& node) {
-  result.GetUsedExtensions().insert("BuiltinVariables");
+  result.AddUsedBuiltinExtension("BuiltinVariables");
   if (node.child) node.child->Visit(*this);
 };
 
 void UsedExtensionsFinder::OnVisitVariableBracketAccessorNode(
     VariableBracketAccessorNode& node) {
-  result.GetUsedExtensions().insert("BuiltinVariables");
+  result.AddUsedBuiltinExtension("BuiltinVariables");
   node.expression->Visit(*this);
   if (node.child) node.child->Visit(*this);
 };
@@ -163,9 +175,9 @@ void UsedExtensionsFinder::OnVisitIdentifierNode(IdentifierNode &node) {
     // An object or object variable is used.
     auto metadata = gd::MetadataProvider::GetExtensionAndObjectMetadata(
         project.GetCurrentPlatform(), node.identifierName);
-    result.GetUsedExtensions().insert(metadata.GetExtension().GetName());
+    result.AddUsedExtension(metadata.GetExtension());
     for (auto &&includeFile : metadata.GetMetadata().includeFiles) {
-      result.GetUsedIncludeFiles().insert(includeFile);
+      result.AddUsedIncludeFiles(includeFile);
     }
   }
 };
@@ -187,9 +199,9 @@ void UsedExtensionsFinder::OnVisitFunctionCallNode(FunctionCallNode& node) {
       return;
   }
 
-  result.GetUsedExtensions().insert(metadata.GetExtension().GetName());
+  result.AddUsedExtension(metadata.GetExtension());
   for (auto&& includeFile : metadata.GetMetadata().GetIncludeFiles()) {
-    result.GetUsedIncludeFiles().insert(includeFile);
+    result.AddUsedIncludeFiles(includeFile);
   }
 };
 

Core/GDCore/IDE/Events/UsedExtensionsFinder.h

@@ -9,6 +9,8 @@
 #include <set>
 
 #include "GDCore/Events/Parsers/ExpressionParser2NodeWorker.h"
+#include "GDCore/Extensions/Metadata/SourceFileMetadata.h"
+#include "GDCore/Extensions/PlatformExtension.h"
 #include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
 #include "GDCore/IDE/Project/ArbitraryObjectsWorker.h"
 #include "GDCore/String.h"
@@ -44,6 +46,10 @@ public:
     return usedRequiredFiles;
   }
 
+  const std::vector<gd::SourceFileMetadata>& GetUsedSourceFiles() const {
+    return usedSourceFiles;
+  }
+
   /**
    * \brief Return true when at least 1 object uses the 3D renderer.
    */
@@ -51,20 +57,10 @@ public:
     return has3DObjects;
   }
 
-  /**
-   * The extensions used by the project (or part of it).
-   */
-  std::set<gd::String> &GetUsedExtensions() { return usedExtensions; }
-
-  /**
-   * The include files used at runtime by the project (or part of it).
-   */
-  std::set<gd::String> &GetUsedIncludeFiles() { return usedIncludeFiles; }
-
-  /**
-   * The additional files required at runtime by the project (or part of it).
-   */
-  std::set<gd::String> &GetUsedRequiredFiles() { return usedRequiredFiles; }
+  void AddUsedExtension(const gd::PlatformExtension& extension);
+  void AddUsedBuiltinExtension(const gd::String& extensionName);
+  void AddUsedIncludeFiles(const gd::String& includeFile) { usedIncludeFiles.insert(includeFile); }
+  void AddUsedRequiredFiles(const gd::String& requiredFile) { usedRequiredFiles.insert(requiredFile); }
 
   void MarkAsHaving3DObjects() {
     has3DObjects = true;
@@ -74,6 +70,7 @@ private:
   std::set<gd::String> usedExtensions;
   std::set<gd::String> usedIncludeFiles;
   std::set<gd::String> usedRequiredFiles;
+  std::vector<gd::SourceFileMetadata> usedSourceFiles;
   bool has3DObjects = false;
 };
 

Core/GDCore/IDE/EventsFunctionTools.cpp

@@ -9,7 +9,10 @@
 #include "GDCore/Extensions/Metadata/ParameterMetadataTools.h"
 #include "GDCore/Project/EventsBasedBehavior.h"
 #include "GDCore/Project/EventsBasedObject.h"
-//#include "GDCore/Project/ObjectsContainer.h"
+#include "GDCore/Project/ObjectsContainer.h"
+#include "GDCore/Project/ParameterMetadataContainer.h"
+#include "GDCore/Project/PropertiesContainer.h"
+#include "GDCore/Project/VariablesContainer.h"
 #include "GDCore/Project/EventsFunction.h"
 #include "GDCore/Project/Object.h"
 #include "GDCore/Project/Project.h"
@@ -100,4 +103,72 @@ void EventsFunctionTools::ObjectEventsFunctionToObjectsContainer(
   }
 }
 
+void EventsFunctionTools::ParametersToVariablesContainer(
+    const ParameterMetadataContainer &parameters,
+    gd::VariablesContainer &outputVariablesContainer) {
+  if (outputVariablesContainer.GetSourceType() !=
+      gd::VariablesContainer::SourceType::Parameters) {
+    throw std::logic_error("Tried to generate a variables container from "
+                           "parameters with the wrong source type.");
+  }
+  outputVariablesContainer.Clear();
+
+  gd::String lastObjectName;
+  for (std::size_t i = 0; i < parameters.GetParametersCount(); ++i) {
+    const auto &parameter = parameters.GetParameter(i);
+    if (parameter.GetName().empty())
+      continue;
+
+    auto &valueTypeMetadata = parameter.GetValueTypeMetadata();
+    if (valueTypeMetadata.IsNumber()) {
+      auto &variable = outputVariablesContainer.InsertNew(
+          parameter.GetName(), outputVariablesContainer.Count());
+      variable.SetValue(0);
+    } else if (valueTypeMetadata.IsString()) {
+      auto &variable = outputVariablesContainer.InsertNew(
+          parameter.GetName(), outputVariablesContainer.Count());
+      variable.SetString("");
+    } else if (valueTypeMetadata.IsBoolean()) {
+      auto &variable = outputVariablesContainer.InsertNew(
+          parameter.GetName(), outputVariablesContainer.Count());
+      variable.SetBool(false);
+    }
+  }
+}
+
+void EventsFunctionTools::PropertiesToVariablesContainer(
+    const PropertiesContainer &properties,
+    gd::VariablesContainer &outputVariablesContainer) {
+  if (outputVariablesContainer.GetSourceType() !=
+      gd::VariablesContainer::SourceType::Properties) {
+    throw std::logic_error("Tried to generate a variables container from "
+                           "properties with the wrong source type.");
+  }
+  outputVariablesContainer.Clear();
+
+  gd::String lastObjectName;
+  for (std::size_t i = 0; i < properties.GetCount(); ++i) {
+    const auto &property = properties.Get(i);
+    if (property.GetName().empty())
+      continue;
+
+    auto &propertyType = gd::ValueTypeMetadata::GetPrimitiveValueType(
+        gd::ValueTypeMetadata::ConvertPropertyTypeToValueType(
+            property.GetType()));
+    if (propertyType == "number") {
+      auto &variable = outputVariablesContainer.InsertNew(
+          property.GetName(), outputVariablesContainer.Count());
+      variable.SetValue(0);
+    } else if (propertyType == "string") {
+      auto &variable = outputVariablesContainer.InsertNew(
+          property.GetName(), outputVariablesContainer.Count());
+      variable.SetString("");
+    } else if (propertyType == "boolean") {
+      auto &variable = outputVariablesContainer.InsertNew(
+          property.GetName(), outputVariablesContainer.Count());
+      variable.SetBool(false);
+    }
+  }
+}
+
 }  // namespace gd

Core/GDCore/IDE/EventsFunctionTools.h

@@ -12,6 +12,9 @@ namespace gd {
 class Project;
 class EventsFunctionsContainer;
 class ObjectsContainer;
+class ParameterMetadataContainer;
+class PropertiesContainer;
+class VariablesContainer;
 class ParameterMetadata;
 class EventsFunction;
 class EventsBasedBehavior;
@@ -68,5 +71,13 @@ class GD_CORE_API EventsFunctionTools {
       const gd::EventsBasedObject& eventsBasedObject,
       const gd::EventsFunction& eventsFunction,
       gd::ObjectsContainer& outputObjectsContainer);
+
+  static void ParametersToVariablesContainer(
+      const ParameterMetadataContainer &parameters,
+      gd::VariablesContainer &outputVariablesContainer);
+
+  static void PropertiesToVariablesContainer(
+      const PropertiesContainer &properties,
+      gd::VariablesContainer &outputVariablesContainer);
 };
 }  // namespace gd

Core/GDCore/IDE/ObjectVariableHelper.cpp

@@ -3,9 +3,10 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#include "GroupVariableHelper.h"
+#include "ObjectVariableHelper.h"
 
 #include "GDCore/IDE/WholeProjectRefactorer.h"
+#include "GDCore/Project/InitialInstancesContainer.h"
 #include "GDCore/Project/Object.h"
 #include "GDCore/Project/ObjectGroup.h"
 #include "GDCore/Project/ObjectsContainer.h"
@@ -16,7 +17,7 @@
 
 namespace gd {
 
-void GroupVariableHelper::FillAnyVariableBetweenObjects(
+void ObjectVariableHelper::FillAnyVariableBetweenObjects(
     gd::ObjectsContainer &globalObjectsContainer,
     gd::ObjectsContainer &objectsContainer,
     const gd::ObjectGroup &objectGroup) {
@@ -65,7 +66,7 @@ void GroupVariableHelper::FillAnyVariableBetweenObjects(
   }
 }
 
-gd::VariablesContainer GroupVariableHelper::MergeVariableContainers(
+gd::VariablesContainer ObjectVariableHelper::MergeVariableContainers(
     const gd::ObjectsContainersList &objectsContainersList,
     const gd::ObjectGroup &objectGroup) {
   gd::VariablesContainer mergedVariablesContainer;
@@ -113,7 +114,7 @@ gd::VariablesContainer GroupVariableHelper::MergeVariableContainers(
   return mergedVariablesContainer;
 }
 
-void GroupVariableHelper::FillMissingGroupVariablesToObjects(
+void ObjectVariableHelper::FillMissingGroupVariablesToObjects(
     gd::ObjectsContainer &globalObjectsContainer,
     gd::ObjectsContainer &objectsContainer, const gd::ObjectGroup &objectGroup,
     const gd::SerializerElement &originalSerializedVariables) {
@@ -145,7 +146,7 @@ void GroupVariableHelper::FillMissingGroupVariablesToObjects(
 // TODO Handle position changes for group variables.
 // We could try to change the order of object variables in a way that the next
 // call to MergeVariableContainers rebuild them in the same order.
-void GroupVariableHelper::ApplyChangesToObjects(
+void ObjectVariableHelper::ApplyChangesToObjects(
     gd::ObjectsContainer &globalObjectsContainer,
     gd::ObjectsContainer &objectsContainer,
     const gd::VariablesContainer &groupVariablesContainer,
@@ -193,4 +194,48 @@ void GroupVariableHelper::ApplyChangesToObjects(
   }
 }
 
+void ObjectVariableHelper::ApplyChangesToObjectInstances(
+    gd::VariablesContainer &objectVariablesContainer,
+    gd::InitialInstancesContainer &initialInstancesContainer,
+    const gd::String &objectName, const gd::VariablesChangeset &changeset) {
+  initialInstancesContainer.IterateOverInstances(
+      [&objectVariablesContainer, &objectName,
+       &changeset](gd::InitialInstance &instance) {
+        if (instance.GetObjectName() == objectName) {
+          auto &destinationVariablesContainer = instance.GetVariables();
+          for (const gd::String &variableName :
+               changeset.removedVariableNames) {
+            destinationVariablesContainer.Remove(variableName);
+          }
+          for (const gd::String &variableName : changeset.addedVariableNames) {
+            // Instance variables may already exist with another type.
+            if (destinationVariablesContainer.Has(variableName) &&
+                destinationVariablesContainer.Get(variableName).GetType() !=
+                    objectVariablesContainer.Get(variableName).GetType()) {
+              destinationVariablesContainer.Remove(variableName);
+            }
+          }
+          for (const auto &pair : changeset.oldToNewVariableNames) {
+            const gd::String &oldVariableName = pair.first;
+            const gd::String &newVariableName = pair.second;
+            if (destinationVariablesContainer.Has(newVariableName)) {
+              // It can happens if an instance already had the variable.
+              destinationVariablesContainer.Remove(oldVariableName);
+            } else {
+              destinationVariablesContainer.Rename(oldVariableName,
+                                                   newVariableName);
+            }
+          }
+          // Apply type changes
+          for (const gd::String &variableName :
+               changeset.valueChangedVariableNames) {
+            if (destinationVariablesContainer.Has(variableName) &&
+                destinationVariablesContainer.Get(variableName).GetType() !=
+                    objectVariablesContainer.Get(variableName).GetType()) {
+              destinationVariablesContainer.Remove(variableName);
+            }
+          }
+        }
+      });
+}
 } // namespace gd

Core/GDCore/IDE/ObjectVariableHelper.h

@@ -8,6 +8,7 @@
 #include "GDCore/Project/VariablesContainer.h"
 
 namespace gd {
+class InitialInstancesContainer;
 class ObjectsContainersList;
 class ObjectsContainer;
 class ObjectGroup;
@@ -22,7 +23,7 @@ namespace gd {
  *
  * This is used by the object group variable editor.
  */
-class GD_CORE_API GroupVariableHelper {
+class GD_CORE_API ObjectVariableHelper {
 public:
   /**
    * Copy every variable from every object of the group to the other objects
@@ -70,6 +71,17 @@ public:
                         const gd::VariablesContainer &groupVariablesContainer,
                         const gd::ObjectGroup &objectGroup,
                         const gd::VariablesChangeset &changeset);
+
+  static void ApplyChangesToObjectInstances(
+      gd::VariablesContainer &objectVariablesContainer,
+      gd::InitialInstancesContainer &initialInstancesContainer,
+      const gd::String &objectName, const gd::VariablesChangeset &changeset);
+
+private:
+  static void ApplyChangesToVariableContainer(
+      const gd::VariablesContainer &originalVariablesContainer,
+      gd::VariablesContainer &destinationVariablesContainer,
+      const gd::VariablesChangeset &changeset, bool shouldApplyValueChanges);
 };
 
-} // namespace gd
+} // namespace gd

Core/GDCore/IDE/Project/ArbitraryResourceWorker.cpp

@@ -62,6 +62,11 @@ void ArbitraryResourceWorker::ExposeSpine(gd::String& resourceName){
     // do.
 };
 
+void ArbitraryResourceWorker::ExposeJavaScript(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.
@@ -195,6 +200,10 @@ void ArbitraryResourceWorker::ExposeResourceWithType(
     ExposeSpine(resourceName);
     return;
   }
+  if (resourceType == "javascript") {
+    ExposeJavaScript(resourceName);
+    return;
+  }
   gd::LogError("Unexpected resource type: " + resourceType + " for: " + resourceName);
   return;
 }

Core/GDCore/IDE/Project/ArbitraryResourceWorker.h

@@ -96,7 +96,7 @@ public:
    * \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.
    */
@@ -112,6 +112,11 @@ public:
    */
   virtual void ExposeVideo(gd::String &videoName);
 
+  /**
+   * \brief Expose a JavaScript file, which is always a reference to a "javascript" resource.
+   */
+  virtual void ExposeJavaScript(gd::String &javaScriptName);
+
   /**
    * \brief Expose a bitmap font, which is always a reference to a "bitmapFont" resource.
    */

Core/GDCore/IDE/Project/AssetResourcePathCleaner.cpp

@@ -38,6 +38,10 @@ void AssetResourcePathCleaner::ExposeVideo(gd::String &videoName) {
   ExposeResourceAsFile(videoName);
 }
 
+void AssetResourcePathCleaner::ExposeJavaScript(gd::String &javaScriptResourceName) {
+  ExposeResourceAsFile(javaScriptResourceName);
+}
+
 void AssetResourcePathCleaner::ExposeBitmapFont(gd::String &bitmapFontName) {
   ExposeResourceAsFile(bitmapFontName);
 }

Core/GDCore/IDE/Project/AssetResourcePathCleaner.h

@@ -46,6 +46,7 @@ public:
   void ExposeTileset(gd::String &tilesetName) override;
   void ExposeVideo(gd::String &videoName) override;
   void ExposeBitmapFont(gd::String &bitmapFontName) override;
+  void ExposeJavaScript(gd::String &javaScriptResourceName) override;
   void ExposeFile(gd::String &resource) override;
 
 protected:

Core/GDCore/IDE/Project/ObjectsUsingResourceCollector.h

@@ -73,6 +73,9 @@ public:
   virtual void ExposeVideo(gd::String& otherResourceName) override {
     MatchResourceName(otherResourceName);
   };
+  virtual void ExposeJavaScript(gd::String& otherResourceName) override {
+    MatchResourceName(otherResourceName);
+  };
   virtual void ExposeBitmapFont(gd::String& otherResourceName) override {
     MatchResourceName(otherResourceName);
   };

Core/GDCore/IDE/Project/ResourcesInUseHelper.h

@@ -60,6 +60,7 @@ public:
     if (resourceType == "model3D") return allModel3Ds;
     if (resourceType == "atlas") return allAtlases;
     if (resourceType == "spine") return allSpines;
+    if (resourceType == "javascript") return allJavaScripts;
 
     return emptyResources;
   };
@@ -88,6 +89,9 @@ public:
   virtual void ExposeVideo(gd::String& resourceName) override {
     allVideos.insert(resourceName);
   };
+  virtual void ExposeJavaScript(gd::String& resourceName) override {
+    allJavaScripts.insert(resourceName);
+  };
   virtual void ExposeBitmapFont(gd::String& resourceName) override {
     allBitmapFonts.insert(resourceName);
   };
@@ -114,6 +118,7 @@ public:
   std::set<gd::String> allModel3Ds;
   std::set<gd::String> allAtlases;
   std::set<gd::String> allSpines;
+  std::set<gd::String> allJavaScripts;
   std::set<gd::String> emptyResources;
 
   static const std::vector<gd::String> resourceTypes;

Core/GDCore/IDE/Project/ResourcesRenamer.h

@@ -59,6 +59,9 @@ class ResourcesRenamer : public gd::ArbitraryResourceWorker {
   virtual void ExposeVideo(gd::String& videoResourceName) override {
     RenameIfNeeded(videoResourceName);
   };
+  virtual void ExposeJavaScript(gd::String& javaScriptResourceName) override {
+    RenameIfNeeded(javaScriptResourceName);
+  };
   virtual void ExposeBitmapFont(gd::String& bitmapFontName) override {
     RenameIfNeeded(bitmapFontName);
   };

Core/GDCore/IDE/Project/SceneResourcesFinder.h

@@ -74,6 +74,9 @@ private:
   void ExposeVideo(gd::String &videoResourceName) override {
     AddUsedResource(videoResourceName);
   };
+  void ExposeJavaScript(gd::String &javaScriptResourceName) override {
+    AddUsedResource(javaScriptResourceName);
+  };
   void ExposeBitmapFont(gd::String &bitmapFontName) override {
     AddUsedResource(bitmapFontName);
   };

Core/GDCore/IDE/ProjectBrowserHelper.cpp

@@ -26,8 +26,24 @@ namespace gd {
 
 void ProjectBrowserHelper::ExposeProjectEvents(
     gd::Project &project, gd::ArbitraryEventsWorker &worker) {
-  // See also gd::Project::ExposeResources for a method that traverses the whole
-  // project (this time for resources).
+  // See also gd::ResourceExposer::ExposeWholeProjectResources
+  // for a method that traverses the whole project (this time for resources).
+
+  ExposeProjectEventsWithoutExtensions(project, worker);
+
+  // Add events based extensions
+  for (std::size_t e = 0; e < project.GetEventsFunctionsExtensionsCount();
+       e++) {
+    auto &eventsFunctionsExtension = project.GetEventsFunctionsExtension(e);
+    ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(project, eventsFunctionsExtension, worker);
+  }
+}
+
+void ProjectBrowserHelper::ExposeProjectEvents(
+    gd::Project &project, gd::ArbitraryEventsWorkerWithContext &worker) {
+  // See also gd::ResourceExposer::ExposeWholeProjectResources
+  // for a method that traverses the whole project (this time for resources)
+  // and ExposeProjectEffects (this time for effects).
 
   ExposeProjectEventsWithoutExtensions(project, worker);
 
@@ -51,6 +67,28 @@ void ProjectBrowserHelper::ExposeProjectEventsWithoutExtensions(
   }
 }
 
+void ProjectBrowserHelper::ExposeProjectEventsWithoutExtensions(
+    gd::Project& project, gd::ArbitraryEventsWorkerWithContext& worker) {
+  // Add layouts events
+  for (std::size_t s = 0; s < project.GetLayoutsCount(); s++) {
+    auto &layout = project.GetLayout(s);
+    auto projectScopedContainers =
+      gd::ProjectScopedContainers::MakeNewProjectScopedContainersForProjectAndLayout(project, layout);
+    worker.Launch(layout.GetEvents(), projectScopedContainers);
+  }
+  // Add external events events
+  for (std::size_t s = 0; s < project.GetExternalEventsCount(); s++) {
+    const auto &externalEvents = project.GetExternalEvents(s);
+    const gd::String &associatedLayout = externalEvents.GetAssociatedLayout();
+    if (project.HasLayoutNamed(associatedLayout)) {
+      auto &layout = project.GetLayout(associatedLayout);
+      auto projectScopedContainers =
+        gd::ProjectScopedContainers::MakeNewProjectScopedContainersForProjectAndLayout(project, layout);
+      worker.Launch(project.GetExternalEvents(s).GetEvents(), projectScopedContainers);
+    }
+  }
+}
+
 void ProjectBrowserHelper::ExposeLayoutEventsAndExternalEvents(
     gd::Project &project, gd::Layout &layout,
     gd::ArbitraryEventsWorker &worker) {
@@ -106,48 +144,17 @@ void ProjectBrowserHelper::ExposeLayoutEventsAndDependencies(
   }
   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
-  // project (this time for resources) and ExposeProjectEffects (this time for
-  // effects).
-
-  // Add layouts events
-  for (std::size_t s = 0; s < project.GetLayoutsCount(); s++) {
-    auto &layout = project.GetLayout(s);
-    auto projectScopedContainers =
-      gd::ProjectScopedContainers::MakeNewProjectScopedContainersForProjectAndLayout(project, layout);
-    worker.Launch(layout.GetEvents(), projectScopedContainers);
-  }
-  // Add external events events
-  for (std::size_t s = 0; s < project.GetExternalEventsCount(); s++) {
-    const auto &externalEvents = project.GetExternalEvents(s);
-    const gd::String &associatedLayout = externalEvents.GetAssociatedLayout();
-    if (project.HasLayoutNamed(associatedLayout)) {
-      auto &layout = project.GetLayout(associatedLayout);
-      auto projectScopedContainers =
-        gd::ProjectScopedContainers::MakeNewProjectScopedContainersForProjectAndLayout(project, layout);
-      worker.Launch(project.GetExternalEvents(s).GetEvents(), projectScopedContainers);
-    }
-  }
-  // Add events based extensions
-  for (std::size_t e = 0; e < project.GetEventsFunctionsExtensionsCount();
-       e++) {
-    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()) {
+    for (auto &&eventsFunction :
+         eventsFunctionsExtension.GetEventsFunctions().GetInternalVector()) {
       worker.Launch(eventsFunction->GetEvents());
     }
 
@@ -169,13 +176,18 @@ void ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(
     gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension,
     gd::ArbitraryEventsWorkerWithContext &worker) {
     // Add (free) events functions
-    for (auto &&eventsFunction : eventsFunctionsExtension.GetInternalVector()) {
+    for (auto &&eventsFunction :
+         eventsFunctionsExtension.GetEventsFunctions().GetInternalVector()) {
       gd::ObjectsContainer parameterObjectsContainer(
           gd::ObjectsContainer::SourceType::Function);
+    gd::VariablesContainer parameterVariablesContainer(
+        gd::VariablesContainer::SourceType::Parameters);
+    gd::VariablesContainer propertyVariablesContainer(
+        gd::VariablesContainer::SourceType::Properties);
       auto projectScopedContainers = gd::ProjectScopedContainers::
           MakeNewProjectScopedContainersForFreeEventsFunction(
               project, eventsFunctionsExtension, *eventsFunction,
-              parameterObjectsContainer);
+              parameterObjectsContainer, parameterVariablesContainer);
 
       worker.Launch(eventsFunction->GetEvents(), projectScopedContainers);
     }
@@ -207,15 +219,32 @@ void ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
     gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension,
     const gd::EventsBasedBehavior &eventsBasedBehavior,
     gd::ArbitraryEventsWorkerWithContext &worker) {
+  gd::VariablesContainer propertyVariablesContainer(
+      gd::VariablesContainer::SourceType::Properties);
+  gd::ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
+    project, eventsFunctionsExtension,
+    eventsBasedBehavior,
+    propertyVariablesContainer,
+    worker);
+}
+
+void ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
+    gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    const gd::EventsBasedBehavior &eventsBasedBehavior,
+    gd::VariablesContainer &propertyVariablesContainer,
+    gd::ArbitraryEventsWorkerWithContext &worker) {
   auto &behaviorEventsFunctions = eventsBasedBehavior.GetEventsFunctions();
   for (auto &&eventsFunction : behaviorEventsFunctions.GetInternalVector()) {
 
     gd::ObjectsContainer parameterObjectsContainers(
         gd::ObjectsContainer::SourceType::Function);
+    gd::VariablesContainer parameterVariablesContainer(
+        gd::VariablesContainer::SourceType::Parameters);
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForBehaviorEventsFunction(
             project, eventsFunctionsExtension, eventsBasedBehavior,
-            *eventsFunction, parameterObjectsContainers);
+            *eventsFunction, parameterObjectsContainers,
+            parameterVariablesContainer, propertyVariablesContainer);
 
     worker.Launch(eventsFunction->GetEvents(), projectScopedContainers);
   }
@@ -235,15 +264,31 @@ void ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
     const gd::EventsFunctionsExtension &eventsFunctionsExtension,
     const gd::EventsBasedObject &eventsBasedObject,
     gd::ArbitraryEventsWorkerWithContext &worker) {
+  gd::VariablesContainer propertyVariablesContainer(
+      gd::VariablesContainer::SourceType::Properties);
+  gd::ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
+      project, eventsFunctionsExtension, eventsBasedObject,
+      propertyVariablesContainer, worker);
+}
+
+void ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
+    gd::Project &project,
+    const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    const gd::EventsBasedObject &eventsBasedObject,
+    gd::VariablesContainer &propertyVariablesContainer,
+    gd::ArbitraryEventsWorkerWithContext &worker) {
   auto &objectEventsFunctions = eventsBasedObject.GetEventsFunctions();
   for (auto &&eventsFunction : objectEventsFunctions.GetInternalVector()) {
 
     gd::ObjectsContainer parameterObjectsContainers(
         gd::ObjectsContainer::SourceType::Function);
+    gd::VariablesContainer parameterVariablesContainer(
+        gd::VariablesContainer::SourceType::Parameters);
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForObjectEventsFunction(
             project, eventsFunctionsExtension, eventsBasedObject,
-            *eventsFunction, parameterObjectsContainers);
+            *eventsFunction, parameterObjectsContainers,
+            parameterVariablesContainer, propertyVariablesContainer);
 
     worker.Launch(eventsFunction->GetEvents(), projectScopedContainers);
   }
@@ -287,7 +332,7 @@ void ProjectBrowserHelper::ExposeProjectFunctions(
   for (std::size_t e = 0; e < project.GetEventsFunctionsExtensionsCount();
        e++) {
     auto &eventsFunctionsExtension = project.GetEventsFunctionsExtension(e);
-    worker.Launch(eventsFunctionsExtension);
+    worker.Launch(eventsFunctionsExtension.GetEventsFunctions());
 
     for (auto &&eventsBasedBehavior :
          eventsFunctionsExtension.GetEventsBasedBehaviors()

Core/GDCore/IDE/ProjectBrowserHelper.h

@@ -19,6 +19,7 @@ class ArbitraryEventsFunctionsWorker;
 class ArbitraryObjectsWorker;
 class ArbitraryEventBasedBehaviorsWorker;
 class ArbitraryBehaviorSharedDataWorker;
+class VariablesContainer;
 } // namespace gd
 
 namespace gd {
@@ -56,6 +57,15 @@ public:
   ExposeProjectEventsWithoutExtensions(gd::Project &project,
                                        gd::ArbitraryEventsWorker &worker);
 
+  /**
+   * \brief Call the specified worker on all events of the project (layout and
+   * external events) but not events from extensions.
+   *
+   * Only use this for stats.
+   */
+  static void ExposeProjectEventsWithoutExtensions(
+      gd::Project &project, gd::ArbitraryEventsWorkerWithContext &worker);
+
   /**
    * \brief Call the specified worker on all events of a layout and
    * its external events.
@@ -127,6 +137,20 @@ public:
       const gd::EventsBasedBehavior &eventsBasedBehavior,
       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
+   * event-based behavior.
+   */
+  static void ExposeEventsBasedBehaviorEvents(
+      gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      const gd::EventsBasedBehavior &eventsBasedBehavior,
+      gd::VariablesContainer &propertyVariablesContainer,
+      gd::ArbitraryEventsWorkerWithContext &worker);
+
   /**
    * \brief Call the specified worker on all events of the event-based
    * object.
@@ -152,6 +176,20 @@ public:
       const gd::EventsBasedObject &eventsBasedObject,
       gd::ArbitraryEventsWorkerWithContext &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,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      const gd::EventsBasedObject &eventsBasedObject,
+      gd::VariablesContainer &propertyVariablesContainer,
+      gd::ArbitraryEventsWorkerWithContext &worker);
+
   /**
    * \brief Call the specified worker on all ObjectContainers of the project
    * (global, layouts...)

Core/GDCore/IDE/ProjectStripper.cpp

@@ -63,7 +63,7 @@ void GD_CORE_API ProjectStripper::StripProjectForExport(gd::Project &project) {
       eventsBasedObject.GetPropertyDescriptors().GetInternalVector().clear();
     }
     extension.GetEventsBasedBehaviors().Clear();
-    extension.ClearEventsFunctions();
+    extension.GetEventsFunctions().ClearEventsFunctions();
   }
 }
 

Core/GDCore/IDE/PropertyFunctionGenerator.cpp

@@ -42,6 +42,9 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
     const gd::NamedPropertyDescriptor &property, const gd::String &objectType,
     bool isBehavior, bool isSharedProperties) {
   auto &propertyName = property.GetName();
+  const auto &primitiveType = gd::ValueTypeMetadata::GetPrimitiveValueType(
+      gd::ValueTypeMetadata::ConvertPropertyTypeToValueType(
+          property.GetType()));
   auto &functionsContainer = eventsBasedEntity.GetEventsFunctions();
   gd::String capitalizedName = CapitalizeFirstLetter(property.GetName());
   gd::String setterName = "Set" + capitalizedName;
@@ -59,9 +62,9 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
       property.GetLabel().empty() ? property.GetName() : property.GetLabel();
 
   gd::String descriptionSubject =
-      (property.GetType() == "Boolean" ? "if " : "the ") +
+      (primitiveType == "boolean" ? "if " : "the ") +
       UnCapitalizeFirstLetter(propertyLabel) +
-      (isSharedProperties || property.GetType() == "Boolean"
+      (isSharedProperties || primitiveType == "boolean"
            ? "."
            : " of the object.") +
       (property.GetDescription().empty() ? ""
@@ -71,19 +74,7 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
              "objects using the behavior."
            : "");
 
-  gd::String propertyGetterName =
-      (isSharedProperties ? "SharedProperty" : "Property") + property.GetName();
-  gd::String getterType =
-      gd::PlatformExtension::GetBehaviorEventsFunctionFullType(
-          extension.GetName(), eventsBasedEntity.GetName(), propertyGetterName);
-  gd::String setterType =
-      gd::PlatformExtension::GetBehaviorEventsFunctionFullType(
-          extension.GetName(), eventsBasedEntity.GetName(),
-          "Set" + propertyGetterName);
-
   gd::String getterName = capitalizedName;
-  gd::String numberOrString =
-      property.GetType() == "Number" ? "Number" : "String";
 
   if (!functionsContainer.HasEventsFunctionNamed(getterName)) {
     auto &getter = functionsContainer.InsertNewEventsFunction(
@@ -99,7 +90,7 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
         .SetName(legacyExpressionType)
         .SetExtraInfo(GetStringifiedExtraInfo(property));
     getter.SetFullName(propertyLabel).SetGroup(functionGroupName);
-    if (property.GetType() == "Boolean") {
+    if (primitiveType == "boolean") {
       getter.SetFunctionType(gd::EventsFunction::Condition)
           .SetDescription("Check " + descriptionSubject)
           .SetSentence("_PARAM0_ " + UnCapitalizeFirstLetter(propertyLabel));
@@ -112,13 +103,12 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
     auto &event =
         dynamic_cast<gd::StandardEvent &>(getter.GetEvents().InsertNewEvent(
             project, "BuiltinCommonInstructions::Standard", 0));
-    if (property.GetType() == "Boolean") {
+    if (primitiveType == "boolean") {
       gd::Instruction condition;
-      condition.SetType(getterType);
-      condition.AddParameter("Object");
-      if (isBehavior) {
-        condition.AddParameter("Behavior");
-      }
+      condition.SetType("BooleanVariable");
+      condition.AddParameter(propertyName);
+      condition.AddParameter("True");
+      condition.AddParameter("");
       event.GetConditions().Insert(condition, 0);
 
       gd::Instruction action;
@@ -127,6 +117,8 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
       event.GetActions().Insert(action, 0);
     } else {
       gd::Instruction action;
+      gd::String numberOrString =
+          primitiveType == "number" ? "Number" : "String";
       action.SetType("SetReturn" + numberOrString);
       action.AddParameter(property.GetName());
       event.GetActions().Insert(action, 0);
@@ -136,7 +128,7 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
   if (!functionsContainer.HasEventsFunctionNamed(setterName)) {
     auto &setter = functionsContainer.InsertNewEventsFunction(
         setterName, functionsContainer.GetEventsFunctionsCount());
-    if (property.GetType() == "Boolean") {
+    if (primitiveType == "boolean") {
       setter.SetFunctionType(gd::EventsFunction::Action)
           .SetFullName(propertyLabel)
           .SetGroup(functionGroupName)
@@ -177,26 +169,24 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
       setter.SetGetterName(getterName);
     }
 
-    if (property.GetType() == "Boolean") {
+    if (primitiveType == "boolean") {
       {
         auto &event =
             dynamic_cast<gd::StandardEvent &>(setter.GetEvents().InsertNewEvent(
                 project, "BuiltinCommonInstructions::Standard", 0));
 
         gd::Instruction condition;
-        condition.SetType("GetArgumentAsBoolean");
-        condition.AddParameter("\"Value\"");
+        condition.SetType("BooleanVariable");
+        condition.AddParameter("Value");
+        condition.AddParameter("True");
+        condition.AddParameter("");
         event.GetConditions().Insert(condition, 0);
 
         gd::Instruction action;
-        action.SetType(setterType);
-        action.AddParameter("Object");
-        if (isBehavior) {
-          action.AddParameter("Behavior");
-          action.AddParameter("yes");
-        } else {
-          action.AddParameter("yes");
-        }
+        action.SetType("SetBooleanVariable");
+        action.AddParameter(propertyName);
+        action.AddParameter("True");
+        action.AddParameter("");
         event.GetActions().Insert(action, 0);
       }
       {
@@ -205,20 +195,17 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
                 project, "BuiltinCommonInstructions::Standard", 0));
 
         gd::Instruction condition;
-        condition.SetType("GetArgumentAsBoolean");
-        condition.AddParameter("\"Value\"");
-        condition.SetInverted(true);
+        condition.SetType("BooleanVariable");
+        condition.AddParameter("Value");
+        condition.AddParameter("False");
+        condition.AddParameter("");
         event.GetConditions().Insert(condition, 0);
 
         gd::Instruction action;
-        action.SetType(setterType);
-        action.AddParameter("Object");
-        if (isBehavior) {
-          action.AddParameter("Behavior");
-          action.AddParameter("no");
-        } else {
-          action.AddParameter("no");
-        }
+        action.SetType("SetBooleanVariable");
+        action.AddParameter(propertyName);
+        action.AddParameter("False");
+        action.AddParameter("");
         event.GetActions().Insert(action, 0);
       }
     } else {
@@ -227,16 +214,11 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
               project, "BuiltinCommonInstructions::Standard", 0));
 
       gd::Instruction action;
-      action.SetType(setterType);
-      action.AddParameter("Object");
-      if (isBehavior) {
-        action.AddParameter("Behavior");
-        action.AddParameter("=");
-        action.AddParameter("Value");
-      } else {
-        action.AddParameter("=");
-        action.AddParameter("Value");
-      }
+      action.SetType(primitiveType == "number" ? "SetNumberVariable"
+                                               : "SetStringVariable");
+      action.AddParameter(propertyName);
+      action.AddParameter("=");
+      action.AddParameter("Value");
       event.GetActions().Insert(action, 0);
     }
   }
@@ -245,9 +227,11 @@ void PropertyFunctionGenerator::GenerateGetterAndSetter(
 bool PropertyFunctionGenerator::CanGenerateGetterAndSetter(
     const gd::AbstractEventsBasedEntity &eventsBasedEntity,
     const gd::NamedPropertyDescriptor &property) {
-  auto &type = property.GetType();
-  if (type != "Boolean" && type != "Number" && type != "String" &&
-      type != "Choice" && type != "Color" && type != "LeaderboardId") {
+  const auto &primitiveType = gd::ValueTypeMetadata::GetPrimitiveValueType(
+      gd::ValueTypeMetadata::ConvertPropertyTypeToValueType(
+          property.GetType()));
+  if (primitiveType != "boolean" && primitiveType != "number" &&
+      primitiveType != "string") {
     return false;
   }
 

Core/GDCore/IDE/PropertyFunctionGenerator.h

@@ -3,8 +3,7 @@
  * Copyright 2008-2022 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_PROPERTYFUNCTIONGENERATOR_H
-#define GDCORE_PROPERTYFUNCTIONGENERATOR_H
+#pragma once
 
 namespace gd {
 class String;
@@ -73,5 +72,3 @@ class GD_CORE_API PropertyFunctionGenerator {
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_PROPERTYFUNCTIONGENERATOR_H

Core/GDCore/IDE/ResourceExposer.cpp

@@ -5,21 +5,22 @@
  */
 #include "ResourceExposer.h"
 
+#include "GDCore/Extensions/Metadata/EffectMetadata.h"
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+#include "GDCore/Extensions/Platform.h"
 #include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
 #include "GDCore/IDE/Project/ArbitraryResourceWorker.h"
 #include "GDCore/IDE/ProjectBrowserHelper.h"
+#include "GDCore/Project/Effect.h"
 #include "GDCore/Project/EventsFunctionsExtension.h"
 #include "GDCore/Project/Layout.h"
 #include "GDCore/Project/Project.h"
-#include "GDCore/Project/Effect.h"
 #include "GDCore/String.h"
-#include "GDCore/Extensions/Platform.h"
-#include "GDCore/Extensions/Metadata/MetadataProvider.h"
-#include "GDCore/Extensions/Metadata/EffectMetadata.h"
 
 namespace gd {
 
-void ResourceExposer::ExposeWholeProjectResources(gd::Project& project, gd::ArbitraryResourceWorker& worker) {
+void ResourceExposer::ExposeWholeProjectResources(
+    gd::Project &project, gd::ArbitraryResourceWorker &worker) {
   // See also gd::ProjectBrowserHelper::ExposeProjectEvents for a method that
   // traverse the whole project (this time for events) and ExposeProjectEffects
   // (this time for effects).
@@ -31,13 +32,11 @@ void ResourceExposer::ExposeWholeProjectResources(gd::Project& project, gd::Arbi
 
   // Expose event resources
   auto eventWorker = gd::GetResourceWorkerOnEvents(project, worker);
-  gd::ProjectBrowserHelper::ExposeProjectEvents(
-    project, eventWorker);
+  gd::ProjectBrowserHelper::ExposeProjectEvents(project, eventWorker);
 
   // Expose object configuration resources
   auto objectWorker = gd::GetResourceWorkerOnObjects(project, worker);
-  gd::ProjectBrowserHelper::ExposeProjectObjects(
-    project, objectWorker);
+  gd::ProjectBrowserHelper::ExposeProjectObjects(project, objectWorker);
 
   // Expose layer effect resources
   for (std::size_t layoutIndex = 0; layoutIndex < project.GetLayoutsCount();
@@ -52,28 +51,36 @@ void ResourceExposer::ExposeWholeProjectResources(gd::Project& project, gd::Arbi
       for (size_t effectIndex = 0; effectIndex < effects.GetEffectsCount();
            effectIndex++) {
         auto &effect = effects.GetEffect(effectIndex);
-        gd::ResourceExposer::ExposeEffectResources(project.GetCurrentPlatform(),
-                                                   effect, worker);
+        gd::ResourceExposer::ExposeEffectResources(
+            project.GetCurrentPlatform(), effect, worker);
       }
     }
   }
 
   // Expose loading screen background image if present
-  auto& loadingScreen = project.GetLoadingScreen();
+  auto &loadingScreen = project.GetLoadingScreen();
   if (loadingScreen.GetBackgroundImageResourceName() != "")
     worker.ExposeImage(loadingScreen.GetBackgroundImageResourceName());
+
+  // Expose extension source files
+  for (std::size_t e = 0; e < project.GetEventsFunctionsExtensionsCount();
+       e++) {
+    auto &eventsFunctionsExtension = project.GetEventsFunctionsExtension(e);
+    ExposeExtensionResources(eventsFunctionsExtension, worker);
+  }
 }
 
-void ResourceExposer::ExposeProjectResources(gd::Project& project, gd::ArbitraryResourceWorker& worker) {
+void ResourceExposer::ExposeProjectResources(
+    gd::Project &project, gd::ArbitraryResourceWorker &worker) {
   // Expose global objects configuration resources
   auto objectWorker = gd::GetResourceWorkerOnObjects(project, worker);
   objectWorker.Launch(project.GetObjects());
 }
 
 void ResourceExposer::ExposeLayoutResources(
-    gd::Project &project, gd::Layout &layout,
+    gd::Project &project,
+    gd::Layout &layout,
     gd::ArbitraryResourceWorker &worker) {
-
   // Expose object configuration resources
   auto objectWorker = gd::GetResourceWorkerOnObjects(project, worker);
   gd::ProjectBrowserHelper::ExposeLayoutObjects(layout, objectWorker);
@@ -87,15 +94,15 @@ void ResourceExposer::ExposeLayoutResources(
     for (size_t effectIndex = 0; effectIndex < effects.GetEffectsCount();
          effectIndex++) {
       auto &effect = effects.GetEffect(effectIndex);
-      gd::ResourceExposer::ExposeEffectResources(project.GetCurrentPlatform(),
-                                                 effect, worker);
+      gd::ResourceExposer::ExposeEffectResources(
+          project.GetCurrentPlatform(), effect, worker);
     }
   }
 
   // Expose event resources
   auto eventWorker = gd::GetResourceWorkerOnEvents(project, worker);
-  gd::ProjectBrowserHelper::ExposeLayoutEventsAndDependencies(project, layout,
-                                                              eventWorker);
+  gd::ProjectBrowserHelper::ExposeLayoutEventsAndDependencies(
+      project, layout, eventWorker);
 
   // Exposed extension event resources
   // Note that using resources in extensions is very unlikely and probably not
@@ -103,12 +110,14 @@ void ResourceExposer::ExposeLayoutResources(
   for (std::size_t e = 0; e < project.GetEventsFunctionsExtensionsCount();
        e++) {
     auto &eventsFunctionsExtension = project.GetEventsFunctionsExtension(e);
-    gd::ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(project, eventsFunctionsExtension, eventWorker);
+    gd::ProjectBrowserHelper::ExposeEventsFunctionsExtensionEvents(
+        project, eventsFunctionsExtension, eventWorker);
   }
 }
 
 void ResourceExposer::ExposeEffectResources(
-    gd::Platform &platform, gd::Effect &effect,
+    gd::Platform &platform,
+    gd::Effect &effect,
     gd::ArbitraryResourceWorker &worker) {
   auto &effectMetadata =
       MetadataProvider::GetEffectMetadata(platform, effect.GetEffectType());
@@ -127,11 +136,20 @@ void ResourceExposer::ExposeEffectResources(
         worker.ExposeResourceWithType(resourceType,
                                       potentiallyUpdatedResourceName);
         if (potentiallyUpdatedResourceName != resourceName) {
-          effect.SetStringParameter(propertyName, potentiallyUpdatedResourceName);
+          effect.SetStringParameter(propertyName,
+                                    potentiallyUpdatedResourceName);
         }
       }
     }
   }
 }
 
-} // namespace gd
+void ResourceExposer::ExposeExtensionResources(
+    gd::EventsFunctionsExtension &extension,
+    gd::ArbitraryResourceWorker &worker) {
+  for (auto &sourceFile : extension.GetAllSourceFiles()) {
+    worker.ExposeJavaScript(sourceFile.GetResourceName());
+  }
+}
+
+}  // namespace gd

Core/GDCore/IDE/ResourceExposer.h

@@ -9,9 +9,10 @@ namespace gd {
 class Platform;
 class Project;
 class ArbitraryResourceWorker;
+class EventsFunctionsExtension;
 class Effect;
 class Layout;
-} // namespace gd
+}  // namespace gd
 
 namespace gd {
 
@@ -19,7 +20,7 @@ namespace gd {
  * \brief
  */
 class GD_CORE_API ResourceExposer {
-public:
+ public:
   /**
    * \brief Called ( e.g. during compilation ) so as to inventory internal
    * resources, sometimes update their filename or any other work or resources.
@@ -34,7 +35,7 @@ public:
 
   /**
    * @brief Expose only the resources used globally on a project.
-   * 
+   *
    * It doesn't include resources used in layouts.
    */
   static void ExposeProjectResources(gd::Project &project,
@@ -42,17 +43,25 @@ public:
 
   /**
    * @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);
+  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,
+  static void ExposeEffectResources(gd::Platform &platform,
+                                    gd::Effect &effect,
                                     gd::ArbitraryResourceWorker &worker);
+
+  /**
+   * @brief Expose the resources used in an extension.
+   */
+  static void ExposeExtensionResources(gd::EventsFunctionsExtension &extension,
+                                       gd::ArbitraryResourceWorker &worker);
 };
 
-} // namespace gd
+}  // namespace gd

Core/GDCore/IDE/WholeProjectRefactorer.cpp

@@ -11,7 +11,7 @@
 #include "GDCore/Extensions/Metadata/MetadataProvider.h"
 #include "GDCore/Extensions/PlatformExtension.h"
 #include "GDCore/IDE/DependenciesAnalyzer.h"
-#include "GDCore/IDE/GroupVariableHelper.h"
+#include "GDCore/IDE/ObjectVariableHelper.h"
 #include "GDCore/IDE/EventBasedBehaviorBrowser.h"
 #include "GDCore/IDE/EventBasedObjectBrowser.h"
 #include "GDCore/IDE/Events/ArbitraryEventsWorker.h"
@@ -314,9 +314,16 @@ void WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
   variablesContainer.SerializeTo(editedSerializedVariables);
   variablesContainer.UnserializeFrom(originalSerializedVariables);
 
-  // Rename and remove variables
+  // Rename variables
+  // Pass an empty set to avoid deletion of actions/conditions or events using
+  // them.
+  // While we support refactoring that would remove all references (actions,
+  // conditions...) it's both a bit dangerous for the user and we would need to
+  // show the user what will be removed before doing so. For now, just clear the
+  // removed variables so they don't trigger any refactoring.
+  std::unordered_set<gd::String> removedVariableNames;
   gd::EventsVariableReplacer eventsVariableReplacer(
-      project.GetCurrentPlatform(), changeset, changeset.removedVariableNames,
+      project.GetCurrentPlatform(), changeset, removedVariableNames,
       variablesContainer);
   gd::ProjectBrowserHelper::ExposeProjectEvents(project,
                                                 eventsVariableReplacer);
@@ -333,9 +340,25 @@ void WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
       project, eventsVariableInstructionTypeSwitcher);
 }
 
+// TODO Apply the refactor to external layouts.
+void WholeProjectRefactorer::ApplyRefactoringForObjectVariablesContainer(
+    gd::Project &project, gd::VariablesContainer &objectVariablesContainer,
+    gd::InitialInstancesContainer &initialInstancesContainer,
+    const gd::String &objectName, const gd::VariablesChangeset &changeset,
+    const gd::SerializerElement &originalSerializedVariables) {
+  gd::WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
+      project, objectVariablesContainer, changeset,
+      originalSerializedVariables);
+
+  gd::ObjectVariableHelper::ApplyChangesToObjectInstances(
+      objectVariablesContainer, initialInstancesContainer, objectName,
+      changeset);
+}
+
 void WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
     gd::Project &project, gd::ObjectsContainer &globalObjectsContainer,
     gd::ObjectsContainer &objectsContainer,
+    gd::InitialInstancesContainer &initialInstancesContainer,
     const gd::VariablesContainer &groupVariablesContainer,
     const gd::ObjectGroup &objectGroup,
     const gd::VariablesChangeset &changeset,
@@ -355,11 +378,15 @@ void WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
     }
     auto &object = hasObject ? objectsContainer.GetObject(objectName)
                              : globalObjectsContainer.GetObject(objectName);
-    auto &variablesContainer = object.GetVariables();
+    auto &objectVariablesContainer = object.GetVariables();
+
+    gd::ObjectVariableHelper::ApplyChangesToObjectInstances(
+      objectVariablesContainer, initialInstancesContainer, objectName,
+      changeset);
 
     gd::EventsVariableReplacer eventsVariableReplacer(
         project.GetCurrentPlatform(), changeset,
-        removedVariableNames, variablesContainer);
+        removedVariableNames, objectVariablesContainer);
     gd::ProjectBrowserHelper::ExposeProjectEvents(project,
                                                   eventsVariableReplacer);
   }
@@ -372,12 +399,12 @@ void WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
                                                 eventsVariableReplacer);
 
   // Apply changes to objects.
-  gd::GroupVariableHelper::FillMissingGroupVariablesToObjects(
+  gd::ObjectVariableHelper::FillMissingGroupVariablesToObjects(
       globalObjectsContainer,
       objectsContainer,
       objectGroup,
       originalSerializedVariables);
-  gd::GroupVariableHelper::ApplyChangesToObjects(
+  gd::ObjectVariableHelper::ApplyChangesToObjects(
       globalObjectsContainer, objectsContainer, groupVariablesContainer,
       objectGroup, changeset);
 
@@ -600,7 +627,8 @@ void WholeProjectRefactorer::RenameEventsFunctionsExtension(
   // instructions after they are renamed.
 
   // Free expressions
-  for (auto &&eventsFunction : eventsFunctionsExtension.GetInternalVector()) {
+  for (auto &&eventsFunction :
+       eventsFunctionsExtension.GetEventsFunctions().GetInternalVector()) {
     if (eventsFunction->IsExpression()) {
       renameEventsFunction(*eventsFunction);
     }
@@ -617,7 +645,8 @@ void WholeProjectRefactorer::RenameEventsFunctionsExtension(
   }
 
   // Free instructions
-  for (auto &&eventsFunction : eventsFunctionsExtension.GetInternalVector()) {
+  for (auto &&eventsFunction :
+       eventsFunctionsExtension.GetEventsFunctions().GetInternalVector()) {
     if (eventsFunction->IsAction() || eventsFunction->IsCondition()) {
       renameEventsFunction(*eventsFunction);
     }
@@ -697,11 +726,12 @@ void WholeProjectRefactorer::RenameEventsFunction(
     gd::Project &project,
     const gd::EventsFunctionsExtension &eventsFunctionsExtension,
     const gd::String &oldFunctionName, const gd::String &newFunctionName) {
-  if (!eventsFunctionsExtension.HasEventsFunctionNamed(oldFunctionName))
+  const auto &eventsFunctions = eventsFunctionsExtension.GetEventsFunctions();
+  if (!eventsFunctions.HasEventsFunctionNamed(oldFunctionName))
     return;
 
   const gd::EventsFunction &eventsFunction =
-      eventsFunctionsExtension.GetEventsFunction(oldFunctionName);
+      eventsFunctions.GetEventsFunction(oldFunctionName);
 
   const WholeProjectBrowser wholeProjectExposer;
   DoRenameEventsFunction(
@@ -714,7 +744,7 @@ void WholeProjectRefactorer::RenameEventsFunction(
 
   if (eventsFunction.GetFunctionType() ==
       gd::EventsFunction::ExpressionAndCondition) {
-    for (auto &&otherFunction : eventsFunctionsExtension.GetInternalVector()) {
+    for (auto &&otherFunction : eventsFunctions.GetInternalVector()) {
       if (otherFunction->GetFunctionType() ==
               gd::EventsFunction::ActionWithOperator &&
           otherFunction->GetGetterName() == oldFunctionName) {
@@ -862,16 +892,34 @@ void WholeProjectRefactorer::RenameParameter(
   }
 }
 
+void WholeProjectRefactorer::ChangeParameterType(
+    gd::Project &project, gd::ProjectScopedContainers &projectScopedContainers,
+    gd::EventsFunction &eventsFunction,
+    const gd::ObjectsContainer &parameterObjectsContainer,
+    const gd::String &parameterName) {
+  std::unordered_set<gd::String> typeChangedPropertyNames;
+  typeChangedPropertyNames.insert(parameterName);
+  gd::VariablesContainer propertyVariablesContainer(
+      gd::VariablesContainer::SourceType::Properties);
+  gd::EventsVariableInstructionTypeSwitcher
+      eventsVariableInstructionTypeSwitcher(project.GetCurrentPlatform(),
+                                            typeChangedPropertyNames,
+                                            propertyVariablesContainer);
+  eventsVariableInstructionTypeSwitcher.Launch(eventsFunction.GetEvents(),
+                                               projectScopedContainers);
+}
+
 void WholeProjectRefactorer::MoveEventsFunctionParameter(
     gd::Project &project,
     const gd::EventsFunctionsExtension &eventsFunctionsExtension,
     const gd::String &functionName, std::size_t oldIndex,
     std::size_t newIndex) {
-  if (!eventsFunctionsExtension.HasEventsFunctionNamed(functionName))
+  const auto &eventsFunctions = eventsFunctionsExtension.GetEventsFunctions();
+  if (!eventsFunctions.HasEventsFunctionNamed(functionName))
     return;
 
   const gd::EventsFunction &eventsFunction =
-      eventsFunctionsExtension.GetEventsFunction(functionName);
+      eventsFunctions.GetEventsFunction(functionName);
 
   const gd::String &eventsFunctionType =
       gd::PlatformExtension::GetEventsFunctionFullType(
@@ -1175,6 +1223,42 @@ void WholeProjectRefactorer::RenameEventsBasedObjectProperty(
   gd::ProjectBrowserHelper::ExposeProjectEvents(project, conditionRenamer);
 }
 
+void WholeProjectRefactorer::ChangeEventsBasedBehaviorPropertyType(
+    gd::Project &project,
+    const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    const gd::EventsBasedBehavior &eventsBasedBehavior,
+    const gd::String &propertyName) {
+  std::unordered_set<gd::String> typeChangedPropertyNames;
+  typeChangedPropertyNames.insert(propertyName);
+  gd::VariablesContainer propertyVariablesContainer(
+      gd::VariablesContainer::SourceType::Properties);
+  gd::EventsVariableInstructionTypeSwitcher
+      eventsVariableInstructionTypeSwitcher(project.GetCurrentPlatform(),
+                                            typeChangedPropertyNames,
+                                            propertyVariablesContainer);
+  gd::ProjectBrowserHelper::ExposeEventsBasedBehaviorEvents(
+      project, eventsFunctionsExtension, eventsBasedBehavior,
+      propertyVariablesContainer, eventsVariableInstructionTypeSwitcher);
+}
+
+void WholeProjectRefactorer::ChangeEventsBasedObjectPropertyType(
+    gd::Project &project,
+    const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    const gd::EventsBasedObject &eventsBasedObject,
+    const gd::String &propertyName) {
+  std::unordered_set<gd::String> typeChangedPropertyNames;
+  typeChangedPropertyNames.insert(propertyName);
+  gd::VariablesContainer propertyVariablesContainer(
+      gd::VariablesContainer::SourceType::Properties);
+  gd::EventsVariableInstructionTypeSwitcher
+      eventsVariableInstructionTypeSwitcher(project.GetCurrentPlatform(),
+                                            typeChangedPropertyNames,
+                                            propertyVariablesContainer);
+  gd::ProjectBrowserHelper::ExposeEventsBasedObjectEvents(
+      project, eventsFunctionsExtension, eventsBasedObject,
+      propertyVariablesContainer, eventsVariableInstructionTypeSwitcher);
+}
+
 void WholeProjectRefactorer::AddBehaviorAndRequiredBehaviors(
     gd::Project &project, gd::Object &object, const gd::String &behaviorType,
     const gd::String &behaviorName) {

Core/GDCore/IDE/WholeProjectRefactorer.h

@@ -32,6 +32,7 @@ class UnfilledRequiredBehaviorPropertyProblem;
 class ProjectBrowser;
 class SerializerElement;
 class ProjectScopedContainers;
+class InitialInstancesContainer;
 struct VariablesRenamingChangesetNode;
 }  // namespace gd
 
@@ -80,13 +81,23 @@ class GD_CORE_API WholeProjectRefactorer {
 
   /**
    * \brief Refactor the project according to the changes (renaming or deletion)
-   * made to variables.
+   * made to global or scene variables.
    */
   static void ApplyRefactoringForVariablesContainer(
       gd::Project &project, gd::VariablesContainer &variablesContainer,
       const gd::VariablesChangeset &changeset,
       const gd::SerializerElement &originalSerializedVariables);
 
+  /**
+   * \brief Refactor the project according to the changes (renaming or deletion)
+   * made to object variables.
+   */
+  static void ApplyRefactoringForObjectVariablesContainer(
+      gd::Project &project, gd::VariablesContainer &objectVariablesContainer,
+      gd::InitialInstancesContainer &initialInstancesContainer,
+      const gd::String &objectName, const gd::VariablesChangeset &changeset,
+      const gd::SerializerElement &originalSerializedVariables);
+
   /**
    * \brief Refactor the project according to the changes (renaming or deletion)
    * made to variables of a group.
@@ -94,6 +105,7 @@ class GD_CORE_API WholeProjectRefactorer {
   static void ApplyRefactoringForGroupVariablesContainer(
       gd::Project &project, gd::ObjectsContainer &globalObjectsContainer,
       gd::ObjectsContainer &objectsContainer,
+      gd::InitialInstancesContainer &initialInstancesContainer,
       const gd::VariablesContainer &groupVariablesContainer,
       const gd::ObjectGroup &objectGroup,
       const gd::VariablesChangeset &changeset,
@@ -191,6 +203,16 @@ class GD_CORE_API WholeProjectRefactorer {
                   const gd::String &oldParameterName,
                   const gd::String &newParameterName);
 
+  /**
+   * \brief Refactor the function **after** a parameter has changed of type.
+   */
+  static void
+  ChangeParameterType(gd::Project &project,
+                      gd::ProjectScopedContainers &projectScopedContainers,
+                      gd::EventsFunction &eventsFunction,
+                      const gd::ObjectsContainer &parameterObjectsContainer,
+                      const gd::String &parameterName);
+
   /**
    * \brief Refactor the project **before** an events function parameter
    * is moved.
@@ -283,6 +305,26 @@ class GD_CORE_API WholeProjectRefactorer {
       const gd::String& oldPropertyName,
       const gd::String& newPropertyName);
 
+  /**
+   * \brief Refactor the project **after** a property of a behavior has
+   * changed of type.
+   */
+  static void ChangeEventsBasedBehaviorPropertyType(
+      gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      const gd::EventsBasedBehavior &eventsBasedBehavior,
+      const gd::String &propertyName);
+
+  /**
+   * \brief Refactor the project **after** a property of an object has
+   * changed of type.
+   */
+  static void ChangeEventsBasedObjectPropertyType(
+      gd::Project &project,
+      const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+      const gd::EventsBasedObject &eventsBasedObject,
+      const gd::String &propertyName);
+
   /**
    * \brief Add a behavior to an object and add required behaviors if necessary
    * to fill every behavior properties of the added behaviors.

Core/GDCore/Project/AbstractEventsBasedEntity.cpp

@@ -23,6 +23,9 @@ void AbstractEventsBasedEntity::SerializeTo(SerializerElement& element) const {
   element.SetAttribute("description", description);
   element.SetAttribute("name", name);
   element.SetAttribute("fullName", fullName);
+  if (isPrivate) {
+    element.SetBoolAttribute("private", isPrivate);
+  }
 
   gd::SerializerElement& eventsFunctionsElement =
       element.AddChild("eventsFunctions");
@@ -36,6 +39,7 @@ void AbstractEventsBasedEntity::UnserializeFrom(
   description = element.GetStringAttribute("description");
   name = element.GetStringAttribute("name");
   fullName = element.GetStringAttribute("fullName");
+  isPrivate = element.GetBoolAttribute("private");
 
   const gd::SerializerElement& eventsFunctionsElement =
       element.GetChild("eventsFunctions");

Core/GDCore/Project/AbstractEventsBasedEntity.h

@@ -3,8 +3,7 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_ABSTRACTEVENTSBASEDENTITY_H
-#define GDCORE_ABSTRACTEVENTSBASEDENTITY_H
+#pragma once
 
 #include <vector>
 #include "GDCore/Project/NamedPropertyDescriptor.h"
@@ -40,6 +39,21 @@ class GD_CORE_API AbstractEventsBasedEntity {
    */
   AbstractEventsBasedEntity* Clone() const { return new AbstractEventsBasedEntity(*this); };
 
+  /**
+   * \brief Check if the behavior or object is private - it can't be used outside of its
+   * extension.
+   */
+  bool IsPrivate() const { return isPrivate; }
+
+  /**
+   * \brief Set that the behavior or object is private - it can't be used outside of its
+   * extension.
+   */
+  AbstractEventsBasedEntity& SetPrivate(bool isPrivate_) {
+    isPrivate = isPrivate_;
+    return *this;
+  }
+
   /**
    * \brief Get the description of the behavior or object, that is displayed in the
    * editor.
@@ -151,8 +165,7 @@ class GD_CORE_API AbstractEventsBasedEntity {
   gd::EventsFunctionsContainer eventsFunctionsContainer;
   gd::PropertiesContainer propertyDescriptors;
   gd::String extensionName;
+  bool isPrivate = false;
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_ABSTRACTEVENTSBASEDENTITY_H

Core/GDCore/Project/CustomConfigurationHelper.cpp

@@ -22,15 +22,17 @@ void CustomConfigurationHelper::InitializeContent(
     gd::SerializerElement &configurationContent) {
   for (auto &&property : properties.GetInternalVector()) {
     auto &element = configurationContent.AddChild(property->GetName());
-    auto propertyType = property->GetType();
 
-    if (propertyType == "String" || propertyType == "Choice" ||
-        propertyType == "Color" || propertyType == "Behavior" ||
-        propertyType == "Resource" || propertyType == "LeaderboardId") {
+    const auto &valueType =
+        gd::ValueTypeMetadata::ConvertPropertyTypeToValueType(
+            property->GetType());
+    const auto &primitiveType =
+        gd::ValueTypeMetadata::GetPrimitiveValueType(valueType);
+    if (primitiveType == "string" || valueType == "behavior") {
       element.SetStringValue(property->GetValue());
-    } else if (propertyType == "Number") {
+    } else if (primitiveType == "number") {
       element.SetDoubleValue(property->GetValue().To<double>());
-    } else if (propertyType == "Boolean") {
+    } else if (primitiveType == "boolean") {
       element.SetBoolValue(property->GetValue() == "true");
     }
   }
@@ -43,23 +45,25 @@ std::map<gd::String, gd::PropertyDescriptor> CustomConfigurationHelper::GetPrope
 
   for (auto &property : properties.GetInternalVector()) {
     const auto &propertyName = property->GetName();
-    const auto &propertyType = property->GetType();
 
     // Copy the property
     objectProperties[propertyName] = *property;
 
     auto &newProperty = objectProperties[propertyName];
 
+    const auto &valueType =
+        gd::ValueTypeMetadata::ConvertPropertyTypeToValueType(
+            property->GetType());
+    const auto &primitiveType =
+        gd::ValueTypeMetadata::GetPrimitiveValueType(valueType);
     if (configurationContent.HasChild(propertyName)) {
-      if (propertyType == "String" || propertyType == "Choice" ||
-          propertyType == "Color" || propertyType == "Behavior" ||
-          propertyType == "Resource" || propertyType == "LeaderboardId") {
+      if (primitiveType == "string" || valueType == "behavior") {
         newProperty.SetValue(
             configurationContent.GetChild(propertyName).GetStringValue());
-      } else if (propertyType == "Number") {
+      } else if (primitiveType == "number") {
         newProperty.SetValue(gd::String::From(
             configurationContent.GetChild(propertyName).GetDoubleValue()));
-      } else if (propertyType == "Boolean") {
+      } else if (primitiveType == "boolean") {
         newProperty.SetValue(
             configurationContent.GetChild(propertyName).GetBoolValue()
                 ? "true"
@@ -85,15 +89,16 @@ bool CustomConfigurationHelper::UpdateProperty(
   const auto &property = properties.Get(propertyName);
 
   auto &element = configurationContent.AddChild(propertyName);
-  const gd::String &propertyType = property.GetType();
 
-  if (propertyType == "String" || propertyType == "Choice" ||
-      propertyType == "Color" || propertyType == "Behavior" ||
-      propertyType == "Resource" || propertyType == "LeaderboardId") {
+  const auto &valueType =
+      gd::ValueTypeMetadata::ConvertPropertyTypeToValueType(property.GetType());
+  const auto &primitiveType =
+      gd::ValueTypeMetadata::GetPrimitiveValueType(valueType);
+  if (primitiveType == "string" || valueType == "behavior") {
     element.SetStringValue(newValue);
-  } else if (propertyType == "Number") {
+  } else if (primitiveType == "number") {
     element.SetDoubleValue(newValue.To<double>());
-  } else if (propertyType == "Boolean") {
+  } else if (primitiveType == "boolean") {
     element.SetBoolValue(newValue == "1");
   }
 

Core/GDCore/Project/EventsBasedBehavior.cpp

@@ -21,9 +21,6 @@ EventsBasedBehavior::EventsBasedBehavior()
 void EventsBasedBehavior::SerializeTo(SerializerElement& element) const {
   AbstractEventsBasedEntity::SerializeTo(element);
   element.SetAttribute("objectType", objectType);
-  if (isPrivate) {
-    element.SetBoolAttribute("private", isPrivate);
-  }
   sharedPropertyDescriptors.SerializeElementsTo(
       "propertyDescriptor", element.AddChild("sharedPropertyDescriptors"));
   if (quickCustomizationVisibility != QuickCustomization::Visibility::Default) {
@@ -39,7 +36,6 @@ void EventsBasedBehavior::UnserializeFrom(gd::Project& project,
                                           const SerializerElement& element) {
   AbstractEventsBasedEntity::UnserializeFrom(project, element);
   objectType = element.GetStringAttribute("objectType");
-  isPrivate = element.GetBoolAttribute("private");
   sharedPropertyDescriptors.UnserializeElementsFrom(
       "propertyDescriptor", element.GetChild("sharedPropertyDescriptors"));
   if (element.HasChild("quickCustomizationVisibility")) {

Core/GDCore/Project/EventsBasedBehavior.h

@@ -3,8 +3,7 @@
  * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
  * reserved. This project is released under the MIT License.
  */
-#ifndef GDCORE_EVENTSBASEDBEHAVIOR_H
-#define GDCORE_EVENTSBASEDBEHAVIOR_H
+#pragma once
 
 #include <vector>
 #include "GDCore/Project/AbstractEventsBasedEntity.h"
@@ -75,17 +74,11 @@ class GD_CORE_API EventsBasedBehavior: public AbstractEventsBasedEntity {
   }
 
   /**
-   * \brief Check if the behavior is private - it can't be used outside of its
+   * \brief Set that the behavior or object is private - it can't be used outside of its
    * extension.
    */
-  bool IsPrivate() const { return isPrivate; }
-
-  /**
-   * \brief Set that the behavior is private - it can't be used outside of its
-   * extension.
-   */
-  EventsBasedBehavior& SetPrivate(bool _isPrivate) {
-    isPrivate = _isPrivate;
+  EventsBasedBehavior& SetPrivate(bool isPrivate) {
+    AbstractEventsBasedEntity::SetPrivate(isPrivate);
     return *this;
   }
 
@@ -149,11 +142,8 @@ class GD_CORE_API EventsBasedBehavior: public AbstractEventsBasedEntity {
 
  private:
   gd::String objectType;
-  bool isPrivate = false;
   gd::PropertiesContainer sharedPropertyDescriptors;
   QuickCustomization::Visibility quickCustomizationVisibility;
 };
 
 }  // namespace gd
-
-#endif  // GDCORE_EVENTSBASEDBEHAVIOR_H

Core/GDCore/Project/EventsBasedObject.h

@@ -72,6 +72,15 @@ class GD_CORE_API EventsBasedObject: public AbstractEventsBasedEntity {
     return *this;
   }
 
+  /**
+   * \brief Set that the object is private - it can't be used outside of its
+   * extension.
+   */
+  EventsBasedObject& SetPrivate(bool isPrivate) {
+    AbstractEventsBasedEntity::SetPrivate(isPrivate);
+    return *this;
+  }
+
   /**
    * \brief Declare a usage of the 3D renderer.
    */

Core/GDCore/Project/EventsFunctionsContainer.h

@@ -33,6 +33,20 @@ public:
 
   EventsFunctionsContainer(FunctionOwner source_) : owner(source_) {}
 
+  EventsFunctionsContainer(const EventsFunctionsContainer &other)
+      : owner(other.owner) {
+    Init(other);
+  }
+
+  EventsFunctionsContainer &operator=(const EventsFunctionsContainer &other) {
+    if (this != &other) {
+      owner = other.owner;
+      Init(other);
+    }
+
+    return *this;
+  }
+
   /**
    * \brief Get the source of the function container.
    * 

Core/GDCore/Project/EventsFunctionsExtension.cpp

@@ -15,14 +15,13 @@
 namespace gd {
 
 EventsFunctionsExtension::EventsFunctionsExtension() :
-    gd::EventsFunctionsContainer(
-        gd::EventsFunctionsContainer::FunctionOwner::Extension),
+      eventsFunctionsContainer(gd::EventsFunctionsContainer::FunctionOwner::Extension),
       globalVariables(gd::VariablesContainer::SourceType::ExtensionGlobal),
       sceneVariables(gd::VariablesContainer::SourceType::ExtensionScene) {}
 
 EventsFunctionsExtension::EventsFunctionsExtension(
     const EventsFunctionsExtension& other) :
-    gd::EventsFunctionsContainer(
+    eventsFunctionsContainer(
         gd::EventsFunctionsContainer::FunctionOwner::Extension) {
   Init(other);
 }
@@ -48,7 +47,8 @@ void EventsFunctionsExtension::Init(const gd::EventsFunctionsExtension& other) {
   previewIconUrl = other.previewIconUrl;
   iconUrl = other.iconUrl;
   helpPath = other.helpPath;
-  EventsFunctionsContainer::Init(other);
+  gdevelopVersion = other.gdevelopVersion;
+  eventsFunctionsContainer = other.eventsFunctionsContainer;
   eventsBasedBehaviors = other.eventsBasedBehaviors;
   eventsBasedObjects = other.eventsBasedObjects;
   globalVariables = other.GetGlobalVariables();
@@ -82,15 +82,24 @@ void EventsFunctionsExtension::SerializeTo(SerializerElement& element) const {
   element.SetAttribute("previewIconUrl", previewIconUrl);
   element.SetAttribute("iconUrl", iconUrl);
   element.SetAttribute("helpPath", helpPath);
+  element.SetAttribute("gdevelopVersion", gdevelopVersion);
   auto& dependenciesElement = element.AddChild("dependencies");
   dependenciesElement.ConsiderAsArray();
   for (auto& dependency : dependencies)
     SerializeDependencyTo(dependency, dependenciesElement.AddChild(""));
 
+  if (!sourceFiles.empty()) {
+    auto& sourceFilesElement = element.AddChild("sourceFiles");
+    sourceFilesElement.ConsiderAsArray();
+    for (auto& sourceFile : sourceFiles)
+      sourceFile.SerializeTo(sourceFilesElement.AddChild(""));
+  }
+
   GetGlobalVariables().SerializeTo(element.AddChild("globalVariables"));
   GetSceneVariables().SerializeTo(element.AddChild("sceneVariables"));
 
-  SerializeEventsFunctionsTo(element.AddChild("eventsFunctions"));
+  eventsFunctionsContainer.SerializeEventsFunctionsTo(
+      element.AddChild("eventsFunctions"));
   eventsBasedBehaviors.SerializeElementsTo(
       "eventsBasedBehavior", element.AddChild("eventsBasedBehaviors"));
   eventsBasedObjects.SerializeElementsTo(
@@ -119,6 +128,7 @@ void EventsFunctionsExtension::UnserializeExtensionDeclarationFrom(
   previewIconUrl = element.GetStringAttribute("previewIconUrl");
   iconUrl = element.GetStringAttribute("iconUrl");
   helpPath = element.GetStringAttribute("helpPath");
+  gdevelopVersion = element.GetStringAttribute("gdevelopVersion");
 
   if (element.HasChild("origin")) {
     gd::String originName =
@@ -159,6 +169,17 @@ void EventsFunctionsExtension::UnserializeExtensionDeclarationFrom(
     dependencies.push_back(
         UnserializeDependencyFrom(dependenciesElement.GetChild(i)));
 
+  sourceFiles.clear();
+  if (element.HasChild("sourceFiles")) {
+    const auto& sourceFilesElement = element.GetChild("sourceFiles");
+    sourceFilesElement.ConsiderAsArray();
+    for (size_t i = 0; i < sourceFilesElement.GetChildrenCount(); ++i) {
+      SourceFileMetadata sourceFile;
+      sourceFile.UnserializeFrom(sourceFilesElement.GetChild(i));
+      sourceFiles.push_back(sourceFile);
+    }
+  }
+
   globalVariables.UnserializeFrom(element.GetChild("globalVariables"));
   sceneVariables.UnserializeFrom(element.GetChild("sceneVariables"));
 
@@ -187,7 +208,8 @@ void EventsFunctionsExtension::UnserializeExtensionDeclarationFrom(
 void EventsFunctionsExtension::UnserializeExtensionImplementationFrom(
     gd::Project& project,
     const SerializerElement& element) {
-  UnserializeEventsFunctionsFrom(project, element.GetChild("eventsFunctions"));
+  eventsFunctionsContainer.UnserializeEventsFunctionsFrom(
+      project, element.GetChild("eventsFunctions"));
   eventsBasedBehaviors.UnserializeElementsFrom(
       "eventsBasedBehavior", project, element.GetChild("eventsBasedBehaviors"));
 

Core/GDCore/Project/EventsFunctionsExtension.h

@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "GDCore/Extensions/Metadata/DependencyMetadata.h"
+#include "GDCore/Extensions/Metadata/SourceFileMetadata.h"
 #include "GDCore/Project/EventsBasedBehavior.h"
 #include "GDCore/Project/EventsBasedObject.h"
 #include "GDCore/Project/EventsFunctionsContainer.h"
@@ -35,7 +36,7 @@ namespace gd {
  *
  * \ingroup PlatformDefinition
  */
-class GD_CORE_API EventsFunctionsExtension : public EventsFunctionsContainer {
+class GD_CORE_API EventsFunctionsExtension {
  public:
   EventsFunctionsExtension();
   EventsFunctionsExtension(const EventsFunctionsExtension&);
@@ -133,6 +134,19 @@ class GD_CORE_API EventsFunctionsExtension : public EventsFunctionsContainer {
     return *this;
   }
 
+  /**
+   * \brief Get the GDevelop version required by this extension.
+   */
+  const gd::String& GetGDevelopVersion() const { return gdevelopVersion; };
+
+  /**
+   * \brief Set the GDevelop version required by this extension.
+   */
+  EventsFunctionsExtension& SetGDevelopVersion(const gd::String& gdevelopVersion_) {
+    gdevelopVersion = gdevelopVersion_;
+    return *this;
+  }
+
   /**
    * \brief Return a reference to the list of the events based behaviors.
    */
@@ -180,6 +194,21 @@ class GD_CORE_API EventsFunctionsExtension : public EventsFunctionsContainer {
     return originIdentifier;
   }
 
+  /**
+   * \brief Return a reference to the functions of the events based behavior or object.
+   */
+  EventsFunctionsContainer& GetEventsFunctions() {
+    return eventsFunctionsContainer;
+  }
+
+  /**
+   * \brief Return a const reference to the functions of the events based
+   * behavior or object.
+   */
+  const EventsFunctionsContainer& GetEventsFunctions() const {
+    return eventsFunctionsContainer;
+  }
+
   /** \name Dependencies
    */
   ///@{
@@ -289,6 +318,42 @@ class GD_CORE_API EventsFunctionsExtension : public EventsFunctionsContainer {
       const gd::String& eventsFunctionName);
   ///@}
 
+  /** \name Source files
+   */
+  ///@{
+
+  /**
+   * \brief Adds a new source file.
+   */
+  gd::SourceFileMetadata& AddSourceFile() {
+    gd::SourceFileMetadata sourceFile;
+    sourceFiles.push_back(sourceFile);
+    return sourceFiles.back();
+  };
+
+  /**
+   * \brief Removes a source file.
+   */
+  void RemoveSourceFileAt(size_t index) {
+    sourceFiles.erase(sourceFiles.begin() + index);
+  };
+
+  /**
+   * \brief Returns the list of source files.
+   */
+  std::vector<gd::SourceFileMetadata>& GetAllSourceFiles() {
+    return sourceFiles;
+  };
+
+  /**
+   * \brief Returns the list of source files.
+   */
+  const std::vector<gd::SourceFileMetadata>& GetAllSourceFiles() const {
+    return sourceFiles;
+  };
+
+  ///@}
+
  private:
   /**
    * Initialize object using another object. Used by copy-ctor and assign-op.
@@ -333,10 +398,13 @@ class GD_CORE_API EventsFunctionsExtension : public EventsFunctionsContainer {
   gd::String iconUrl;
   gd::String helpPath;  ///< The relative path to the help for this extension in
                         ///< the documentation (or an absolute URL).
+  gd::String gdevelopVersion;
   gd::SerializableWithNameList<EventsBasedBehavior> eventsBasedBehaviors;
   gd::SerializableWithNameList<EventsBasedObject> eventsBasedObjects;
   std::vector<gd::DependencyMetadata> dependencies;
-  
+  std::vector<gd::SourceFileMetadata> sourceFiles;
+
+  gd::EventsFunctionsContainer eventsFunctionsContainer;
   gd::VariablesContainer globalVariables;
   gd::VariablesContainer sceneVariables;
 };

Core/GDCore/Project/InitialInstancesContainer.cpp

@@ -41,6 +41,11 @@ void InitialInstancesContainer::IterateOverInstances(
   for (auto& instance : initialInstances) func(instance);
 }
 
+void InitialInstancesContainer::IterateOverInstances(
+  const std::function< void(gd::InitialInstance &) >& func) {
+  for (auto& instance : initialInstances) func(instance);
+}
+
 void InitialInstancesContainer::IterateOverInstancesWithZOrdering(
     gd::InitialInstanceFunctor& func, const gd::String& layerName) {
   std::vector<std::reference_wrapper<gd::InitialInstance>> sortedInstances;

Core/GDCore/Project/InitialInstancesContainer.h

@@ -87,6 +87,13 @@ class GD_CORE_API InitialInstancesContainer {
    */
   void IterateOverInstances(InitialInstanceFunctor &func);
 
+  /**
+   * \brief Apply \a func to each instance of the container.
+   * \see InitialInstanceFunctor
+   */
+  void IterateOverInstances(
+    const std::function< void(gd::InitialInstance &) >& func);
+
   /**
    * Get the instances on the specified layer,
    * sort them regarding their Z order and then apply \a func on them.

Core/GDCore/Project/ObjectFolderOrObject.cpp

@@ -137,6 +137,15 @@ void ObjectFolderOrObject::RemoveRecursivelyObjectNamed(
   }
 };
 
+void ObjectFolderOrObject::Clear() {
+  if (IsFolder()) {
+    for (auto& it : children) {
+      it->Clear();
+    }
+    children.clear();
+  }
+};
+
 bool ObjectFolderOrObject::IsADescendantOf(
     const ObjectFolderOrObject& otherObjectFolderOrObject) {
   if (parent == nullptr) return false;

Core/GDCore/Project/ObjectFolderOrObject.h

@@ -134,6 +134,10 @@ class GD_CORE_API ObjectFolderOrObject {
    * the instance children and recursively does it for every folder children.
    */
   void RemoveRecursivelyObjectNamed(const gd::String& name);
+  /**
+   * \brief Clears all children
+   */
+  void Clear();
 
   /**
    * \brief Inserts an instance representing the given object at the given

Core/GDCore/Project/ObjectTools.cpp

@@ -0,0 +1,57 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2025 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "ObjectTools.h"
+
+#include "GDCore/Extensions/Metadata/BehaviorMetadata.h"
+#include "GDCore/Extensions/Metadata/ObjectMetadata.h"
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+#include "GDCore/Extensions/Platform.h"
+
+namespace gd {
+
+bool ObjectTools::IsBehaviorCompatibleWithObject(
+      const gd::Platform &platform, const gd::String &objectType,
+      const gd::String &behaviorType,
+      std::unordered_set<gd::String> coveredBehaviorType) {
+  bool isBehaviorTypeAlreadyCovered =
+      !coveredBehaviorType.insert(behaviorType).second;
+  if (isBehaviorTypeAlreadyCovered) {
+    return true;
+  }
+  const gd::BehaviorMetadata &behaviorMetadata =
+      MetadataProvider::GetBehaviorMetadata(platform, behaviorType);
+  if (MetadataProvider::IsBadBehaviorMetadata(behaviorMetadata)) {
+    // Should not happen because the behavior was added successfully (so its
+    // metadata are valid) - but double check anyway and bail out if the
+    // behavior metadata are invalid.
+    return false;
+  }
+  if (!behaviorMetadata.GetObjectType().empty() &&
+      behaviorMetadata.GetObjectType() != objectType) {
+    return false;
+  }
+  for (const gd::String &requiredBehaviorType :
+       behaviorMetadata.GetRequiredBehaviorTypes()) {
+    const gd::BehaviorMetadata &requiredBehaviorMetadata =
+        gd::MetadataProvider::GetBehaviorMetadata(platform, requiredBehaviorType);
+    if (requiredBehaviorMetadata.IsHidden()) {
+      const gd::ObjectMetadata &objectMetadata =
+          gd::MetadataProvider::GetObjectMetadata(platform, objectType);
+      if (objectMetadata.GetDefaultBehaviors().find(requiredBehaviorType) ==
+          objectMetadata.GetDefaultBehaviors().end()) {
+        // A capability is missing in the object.
+        return false;
+      }
+    }
+    if (!gd::ObjectTools::IsBehaviorCompatibleWithObject(
+            platform, objectType, requiredBehaviorType, coveredBehaviorType)) {
+      return false;
+    }
+  }
+  return true;
+}
+
+} // namespace gd

Core/GDCore/Project/ObjectTools.h

@@ -0,0 +1,35 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-2025 Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#pragma once
+
+#include "GDCore/String.h"
+#include <unordered_set>
+
+namespace gd {
+class Platform;
+class Object;
+} // namespace gd
+
+namespace gd {
+
+class GD_CORE_API ObjectTools {
+public:
+  static bool IsBehaviorCompatibleWithObject(const gd::Platform &platform,
+                                             const gd::String &objectType,
+                                             const gd::String &behaviorType) {
+    std::unordered_set<gd::String> coveredBehaviorType;
+    return IsBehaviorCompatibleWithObject(platform, objectType, behaviorType,
+                                   coveredBehaviorType);
+  }
+
+private:
+  static bool IsBehaviorCompatibleWithObject(
+      const gd::Platform &platform, const gd::String &objectType,
+      const gd::String &behaviorType,
+      std::unordered_set<gd::String> coveredBehaviorType);
+};
+
+} // namespace gd

Core/GDCore/Project/ObjectsContainer.cpp

@@ -7,12 +7,12 @@
 
 #include <algorithm>
 
-#include "GDCore/Tools/PolymorphicClone.h"
 #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"
+#include "GDCore/Tools/PolymorphicClone.h"
 
 namespace gd {
 
@@ -28,8 +28,7 @@ ObjectsContainer::ObjectsContainer(const ObjectsContainer& other) {
   Init(other);
 }
 
-ObjectsContainer& ObjectsContainer::operator=(
-    const ObjectsContainer& other) {
+ObjectsContainer& ObjectsContainer::operator=(const ObjectsContainer& other) {
   if (this != &other) Init(other);
 
   return *this;
@@ -69,7 +68,7 @@ void ObjectsContainer::AddMissingObjectsInRootFolder() {
 
 void ObjectsContainer::UnserializeObjectsFrom(
     gd::Project& project, const SerializerElement& element) {
-  initialObjects.clear();
+  Clear();
   element.ConsiderAsArrayOf("object", "Objet");
   for (std::size_t i = 0; i < element.GetChildrenCount(); ++i) {
     const SerializerElement& objectElement = element.GetChild(i);
@@ -184,6 +183,11 @@ void ObjectsContainer::RemoveObject(const gd::String& name) {
   initialObjects.erase(objectIt);
 }
 
+void ObjectsContainer::Clear() {
+  rootFolder->Clear();
+  initialObjects.clear();
+}
+
 void ObjectsContainer::MoveObjectFolderOrObjectToAnotherContainerInFolder(
     gd::ObjectFolderOrObject& objectFolderOrObject,
     gd::ObjectsContainer& newContainer,

Core/GDCore/Project/ObjectsContainer.h

@@ -166,6 +166,11 @@ class GD_CORE_API ObjectsContainer {
       gd::ObjectFolderOrObject& newParentFolder,
       std::size_t newPosition);
 
+  /**
+   * \brief Clear all groups of the container.
+   */
+  void Clear();
+
   /**
    * Provide a raw access to the vector containing the objects
    */

Core/GDCore/Project/Project.cpp

@@ -30,7 +30,6 @@
 #include "GDCore/Project/ObjectConfiguration.h"
 #include "GDCore/Project/ObjectGroupsContainer.h"
 #include "GDCore/Project/ResourcesManager.h"
-#include "GDCore/Project/SourceFile.h"
 #include "GDCore/Serialization/Serializer.h"
 #include "GDCore/Serialization/SerializerElement.h"
 #include "GDCore/String.h"
@@ -67,7 +66,6 @@ Project::Project()
       isAntialisingEnabledOnMobile(false),
       projectUuid(""),
       useDeprecatedZeroAsDefaultZOrder(false),
-      useExternalSourceFiles(false),
       isPlayableWithKeyboard(false),
       isPlayableWithGamepad(false),
       isPlayableWithMobile(false),
@@ -742,9 +740,6 @@ void Project::UnserializeFrom(const SerializerElement& element) {
   loadingScreen.UnserializeFrom(propElement.GetChild("loadingScreen"));
   watermark.UnserializeFrom(propElement.GetChild("watermark"));
 
-  useExternalSourceFiles =
-      propElement.GetBoolAttribute("useExternalSourceFiles");
-
   authorIds.clear();
   auto& authorIdsElement = propElement.GetChild("authorIds");
   authorIdsElement.ConsiderAsArray();
@@ -917,19 +912,6 @@ void Project::UnserializeFrom(const SerializerElement& element) {
         InsertNewExternalLayout("", GetExternalLayoutsCount());
     newExternalLayout.UnserializeFrom(externalLayoutElement);
   }
-
-  externalSourceFiles.clear();
-  const SerializerElement& externalSourceFilesElement =
-      element.GetChild("externalSourceFiles", 0, "ExternalSourceFiles");
-  externalSourceFilesElement.ConsiderAsArrayOf("sourceFile", "SourceFile");
-  for (std::size_t i = 0; i < externalSourceFilesElement.GetChildrenCount();
-       ++i) {
-    const SerializerElement& sourceFileElement =
-        externalSourceFilesElement.GetChild(i);
-
-    gd::SourceFile& newSourceFile = InsertNewSourceFile("", "");
-    newSourceFile.UnserializeFrom(sourceFileElement);
-  }
 }
 
 void Project::UnserializeAndInsertExtensionsFrom(
@@ -1109,7 +1091,6 @@ void Project::SerializeTo(SerializerElement& element) const {
       propElement.AddChild("platformSpecificAssets"));
   loadingScreen.SerializeTo(propElement.AddChild("loadingScreen"));
   watermark.SerializeTo(propElement.AddChild("watermark"));
-  propElement.SetAttribute("useExternalSourceFiles", useExternalSourceFiles);
 
   auto& authorIdsElement = propElement.AddChild("authorIds");
   authorIdsElement.ConsiderAsArray();
@@ -1197,13 +1178,6 @@ void Project::SerializeTo(SerializerElement& element) const {
   for (std::size_t i = 0; i < externalLayouts.size(); ++i)
     externalLayouts[i]->SerializeTo(
         externalLayoutsElement.AddChild("externalLayout"));
-
-  SerializerElement& externalSourceFilesElement =
-      element.AddChild("externalSourceFiles");
-  externalSourceFilesElement.ConsiderAsArrayOf("sourceFile");
-  for (std::size_t i = 0; i < externalSourceFiles.size(); ++i)
-    externalSourceFiles[i]->SerializeTo(
-        externalSourceFilesElement.AddChild("sourceFile"));
 }
 
 bool Project::IsNameSafe(const gd::String& name) {
@@ -1244,63 +1218,6 @@ gd::String Project::GetSafeName(const gd::String& name) {
   return newName;
 }
 
-bool Project::HasSourceFile(gd::String name, gd::String language) const {
-  vector<std::unique_ptr<SourceFile> >::const_iterator sourceFile =
-      find_if(externalSourceFiles.begin(),
-              externalSourceFiles.end(),
-              [&name](const std::unique_ptr<SourceFile>& sourceFile) {
-                return sourceFile->GetFileName() == name;
-              });
-
-  if (sourceFile == externalSourceFiles.end()) return false;
-
-  return language.empty() || (*sourceFile)->GetLanguage() == language;
-}
-
-gd::SourceFile& Project::GetSourceFile(const gd::String& name) {
-  return *(*find_if(externalSourceFiles.begin(),
-                    externalSourceFiles.end(),
-                    [&name](const std::unique_ptr<SourceFile>& sourceFile) {
-                      return sourceFile->GetFileName() == name;
-                    }));
-}
-
-const gd::SourceFile& Project::GetSourceFile(const gd::String& name) const {
-  return *(*find_if(externalSourceFiles.begin(),
-                    externalSourceFiles.end(),
-                    [&name](const std::unique_ptr<SourceFile>& sourceFile) {
-                      return sourceFile->GetFileName() == name;
-                    }));
-}
-
-void Project::RemoveSourceFile(const gd::String& name) {
-  std::vector<std::unique_ptr<gd::SourceFile> >::iterator sourceFile =
-      find_if(externalSourceFiles.begin(),
-              externalSourceFiles.end(),
-              [&name](const std::unique_ptr<SourceFile>& sourceFile) {
-                return sourceFile->GetFileName() == name;
-              });
-  if (sourceFile == externalSourceFiles.end()) return;
-
-  externalSourceFiles.erase(sourceFile);
-}
-
-gd::SourceFile& Project::InsertNewSourceFile(const gd::String& name,
-                                             const gd::String& language,
-                                             std::size_t position) {
-  if (HasSourceFile(name, language)) return GetSourceFile(name);
-
-  gd::SourceFile& newlyInsertedSourceFile = *(
-      *(externalSourceFiles.emplace(position < externalSourceFiles.size()
-                                        ? externalSourceFiles.begin() + position
-                                        : externalSourceFiles.end(),
-                                    new SourceFile())));
-  newlyInsertedSourceFile.SetLanguage(language);
-  newlyInsertedSourceFile.SetFileName(name);
-
-  return newlyInsertedSourceFile;
-}
-
 Project::Project(const Project &other)
     : objectsContainer(gd::ObjectsContainer::SourceType::Global) {
   Init(other);
@@ -1367,10 +1284,6 @@ void Project::Init(const gd::Project& game) {
   externalLayouts = gd::Clone(game.externalLayouts);
   eventsFunctionsExtensions = gd::Clone(game.eventsFunctionsExtensions);
 
-  useExternalSourceFiles = game.useExternalSourceFiles;
-
-  externalSourceFiles = gd::Clone(game.externalSourceFiles);
-
   variables = game.GetVariables();
 
   projectFile = game.GetProjectFile();

Core/GDCore/Project/Project.h

@@ -32,7 +32,6 @@ class Object;
 class ObjectConfiguration;
 class VariablesContainer;
 class ArbitraryResourceWorker;
-class SourceFile;
 class Behavior;
 class BehaviorsSharedData;
 class BaseEvent;
@@ -1019,56 +1018,6 @@ class GD_CORE_API Project {
   static gd::String GetSafeName(const gd::String& name);
   ///@}
 
-  /** \name External source files
-   * To manage external C++ or Javascript source files used by the game
-   */
-  ///@{
-  /**
-   * \brief Return true if the game activated the use of external source files.
-   */
-  bool UseExternalSourceFiles() const { return useExternalSourceFiles; }
-
-  /**
-   * \brief Return a const reference to the vector containing all the source
-   * files used by the game.
-   */
-  const std::vector<std::unique_ptr<gd::SourceFile> >& GetAllSourceFiles()
-      const {
-    return externalSourceFiles;
-  }
-
-  /**
-   * \brief Return true if the source file with the specified name is used by
-   * the game. \param name The filename of the source file. \param language
-   * Optional. If specified, check that the source file that exists is in this
-   * language.
-   */
-  bool HasSourceFile(gd::String name, gd::String language = "") const;
-
-  /**
-   * Return a reference to the external source file with the given name.
-   */
-  SourceFile& GetSourceFile(const gd::String& name);
-
-  /**
-   * Return a reference to the external source file with the given name.
-   */
-  const SourceFile& GetSourceFile(const gd::String& name) const;
-
-  /**
-   * Remove the specified source file.
-   */
-  void RemoveSourceFile(const gd::String& name);
-
-  /**
-   * Add a new source file the specified position in the external source files
-   * list.
-   */
-  gd::SourceFile& InsertNewSourceFile(const gd::String& name,
-                                      const gd::String& language,
-                                      std::size_t position = -1);
-  ///@}
-
   gd::WholeProjectDiagnosticReport& GetWholeProjectDiagnosticReport() {
     return wholeProjectDiagnosticReport;
   }
@@ -1141,10 +1090,6 @@ class GD_CORE_API Project {
   std::vector<gd::Platform*>
       platforms;  ///< Pointers to the platforms this project supports.
   gd::String firstLayout;
-  bool useExternalSourceFiles =
-      false;  ///< True if game used external source files.
-  std::vector<std::unique_ptr<gd::SourceFile> >
-      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.

Core/GDCore/Project/ProjectScopedContainers.cpp

@@ -70,24 +70,29 @@ ProjectScopedContainers::MakeNewProjectScopedContainersForEventsFunctionsExtensi
 
 ProjectScopedContainers
 ProjectScopedContainers::MakeNewProjectScopedContainersForFreeEventsFunction(
-    const gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension,
+    const gd::Project &project,
+    const gd::EventsFunctionsExtension &eventsFunctionsExtension,
     const gd::EventsFunction &eventsFunction,
-    gd::ObjectsContainer &parameterObjectsContainer) {
+    gd::ObjectsContainer &parameterObjectsContainer,
+    gd::VariablesContainer &parameterVariablesContainer) {
 
   gd::EventsFunctionTools::FreeEventsFunctionToObjectsContainer(
-      project, eventsFunctionsExtension, eventsFunction, parameterObjectsContainer);
+      project, eventsFunctionsExtension.GetEventsFunctions(), eventsFunction,
+      parameterObjectsContainer);
 
   ProjectScopedContainers projectScopedContainers(
       ObjectsContainersList::MakeNewObjectsContainersListForContainer(
           parameterObjectsContainer),
       VariablesContainersList::
-          MakeNewVariablesContainersListForEventsFunctionsExtension(eventsFunctionsExtension),
+          MakeNewVariablesContainersListForFreeEventsFunction(
+              eventsFunctionsExtension, eventsFunction,
+              parameterVariablesContainer),
       &eventsFunctionsExtension.GetGlobalVariables(),
       &eventsFunctionsExtension.GetSceneVariables(),
       PropertiesContainersList::MakeNewEmptyPropertiesContainersList());
 
-  projectScopedContainers.AddParameters(
-      eventsFunction.GetParametersForEvents(eventsFunctionsExtension));
+  projectScopedContainers.AddParameters(eventsFunction.GetParametersForEvents(
+      eventsFunctionsExtension.GetEventsFunctions()));
 
   return projectScopedContainers;
 };
@@ -97,7 +102,9 @@ ProjectScopedContainers::MakeNewProjectScopedContainersForBehaviorEventsFunction
     const gd::Project &project, const gd::EventsFunctionsExtension &eventsFunctionsExtension,
     const gd::EventsBasedBehavior& eventsBasedBehavior,
     const gd::EventsFunction &eventsFunction,
-    gd::ObjectsContainer &parameterObjectsContainer) {
+    gd::ObjectsContainer &parameterObjectsContainer,
+    gd::VariablesContainer &parameterVariablesContainer,
+    gd::VariablesContainer &propertyVariablesContainer) {
 
   gd::EventsFunctionTools::BehaviorEventsFunctionToObjectsContainer(
       project,
@@ -109,7 +116,9 @@ ProjectScopedContainers::MakeNewProjectScopedContainersForBehaviorEventsFunction
       ObjectsContainersList::MakeNewObjectsContainersListForContainer(
           parameterObjectsContainer),
       VariablesContainersList::
-          MakeNewVariablesContainersListForEventsFunctionsExtension(eventsFunctionsExtension),
+          MakeNewVariablesContainersListForBehaviorEventsFunction(
+              eventsFunctionsExtension, eventsBasedBehavior, eventsFunction,
+              parameterVariablesContainer, propertyVariablesContainer),
       &eventsFunctionsExtension.GetGlobalVariables(),
       &eventsFunctionsExtension.GetSceneVariables(),
       PropertiesContainersList::MakeNewEmptyPropertiesContainersList());
@@ -130,7 +139,9 @@ ProjectScopedContainers::MakeNewProjectScopedContainersForObjectEventsFunction(
     const gd::EventsFunctionsExtension &eventsFunctionsExtension,
     const gd::EventsBasedObject &eventsBasedObject,
     const gd::EventsFunction &eventsFunction,
-    gd::ObjectsContainer &parameterObjectsContainer) {
+    gd::ObjectsContainer &parameterObjectsContainer,
+    gd::VariablesContainer &parameterVariablesContainer,
+    gd::VariablesContainer &propertyVariablesContainer) {
 
   gd::EventsFunctionTools::ObjectEventsFunctionToObjectsContainer(
       project, eventsBasedObject, eventsFunction, parameterObjectsContainer);
@@ -140,8 +151,9 @@ ProjectScopedContainers::MakeNewProjectScopedContainersForObjectEventsFunction(
           eventsBasedObject.GetObjects(),
           parameterObjectsContainer),
       VariablesContainersList::
-          MakeNewVariablesContainersListForEventsFunctionsExtension(
-              eventsFunctionsExtension),
+          MakeNewVariablesContainersListForObjectEventsFunction(
+              eventsFunctionsExtension, eventsBasedObject, eventsFunction,
+              parameterVariablesContainer, propertyVariablesContainer),
       &eventsFunctionsExtension.GetGlobalVariables(),
       &eventsFunctionsExtension.GetSceneVariables(),
       PropertiesContainersList::MakeNewEmptyPropertiesContainersList());
@@ -166,7 +178,7 @@ ProjectScopedContainers::MakeNewProjectScopedContainersForEventsBasedObject(
   // created below.
   // Search for "ProjectScopedContainers wrongly containing temporary objects containers or objects"
   // in the codebase.
-  outputObjectsContainer.GetObjects().clear();
+  outputObjectsContainer.Clear();
   outputObjectsContainer.GetObjectGroups().Clear();
 
   // This object named "Object" represents the parent and is used by events.

Core/GDCore/Project/ProjectScopedContainers.h

@@ -69,8 +69,9 @@ class ProjectScopedContainers {
   MakeNewProjectScopedContainersForFreeEventsFunction(
       const gd::Project &project,
       const gd::EventsFunctionsExtension &eventsFunctionsExtension,
-      const gd::EventsFunction& eventsFunction,
-      gd::ObjectsContainer& parameterObjectsContainer);
+      const gd::EventsFunction &eventsFunction,
+      gd::ObjectsContainer &parameterObjectsContainer,
+      gd::VariablesContainer &parameterVariablesContainer);
 
   static ProjectScopedContainers
   MakeNewProjectScopedContainersForBehaviorEventsFunction(
@@ -78,7 +79,9 @@ class ProjectScopedContainers {
       const gd::EventsFunctionsExtension &eventsFunctionsExtension,
       const gd::EventsBasedBehavior &eventsBasedBehavior,
       const gd::EventsFunction &eventsFunction,
-      gd::ObjectsContainer &parameterObjectsContainer);
+      gd::ObjectsContainer &parameterObjectsContainer,
+      gd::VariablesContainer &parameterVariablesContainer,
+      gd::VariablesContainer &propertyVariablesContainer);
 
   static ProjectScopedContainers
   MakeNewProjectScopedContainersForObjectEventsFunction(
@@ -86,7 +89,9 @@ class ProjectScopedContainers {
       const gd::EventsFunctionsExtension &eventsFunctionsExtension,
       const gd::EventsBasedObject &eventsBasedObject,
       const gd::EventsFunction &eventsFunction,
-      gd::ObjectsContainer &parameterObjectsContainer);
+      gd::ObjectsContainer &parameterObjectsContainer,
+      gd::VariablesContainer &parameterVariablesContainer,
+    gd::VariablesContainer &propertyVariablesContainer);
 
   static ProjectScopedContainers
   MakeNewProjectScopedContainersForEventsBasedObject(
@@ -124,9 +129,17 @@ class ProjectScopedContainers {
       std::function<ReturnType()> notFoundCallback) const {
     if (objectsContainersList.HasObjectOrGroupNamed(name))
       return objectCallback();
-    else if (variablesContainersList.Has(name))
+    else if (variablesContainersList.Has(name)) {
+      const auto &variablesContainer =
+          variablesContainersList.GetVariablesContainerFromVariableOrPropertyOrParameterName(name);
+      const auto sourceType = variablesContainer.GetSourceType();
+      if (sourceType == gd::VariablesContainer::SourceType::Properties) {
+        return propertyCallback();
+      } else if (sourceType == gd::VariablesContainer::SourceType::Parameters) {
+        return parameterCallback();
+      }
       return variableCallback();
-    else if (ParameterMetadataTools::Has(parametersVectorsList, name))
+    } else if (ParameterMetadataTools::Has(parametersVectorsList, name))
       return parameterCallback();
     else if (propertiesContainersList.Has(name))
       return propertyCallback();

Core/GDCore/Project/ResourcesManager.cpp

@@ -97,6 +97,8 @@ std::shared_ptr<Resource> ResourcesManager::CreateResource(
     return std::make_shared<AtlasResource>();
   else if (kind == "spine")
     return std::make_shared<SpineResource>();
+  else if (kind == "javascript")
+    return std::make_shared<JavaScriptResource>();
 
   std::cout << "Bad resource created (type: " << kind << ")" << std::endl;
   return std::make_shared<Resource>();
@@ -767,6 +769,20 @@ void AtlasResource::SerializeTo(SerializerElement& element) const {
   element.SetAttribute("file", GetFile());
 }
 
+void JavaScriptResource::SetFile(const gd::String& newFile) {
+  file = NormalizePathSeparator(newFile);
+}
+
+void JavaScriptResource::UnserializeFrom(const SerializerElement& element) {
+  SetUserAdded(element.GetBoolAttribute("userAdded"));
+  SetFile(element.GetStringAttribute("file"));
+}
+
+void JavaScriptResource::SerializeTo(SerializerElement& element) const {
+  element.SetAttribute("userAdded", IsUserAdded());
+  element.SetAttribute("file", GetFile());
+}
+
 ResourceFolder::ResourceFolder(const ResourceFolder& other) { Init(other); }
 
 ResourceFolder& ResourceFolder::operator=(const ResourceFolder& other) {

Core/GDCore/Project/ResourcesManager.h

@@ -547,6 +547,32 @@ class GD_CORE_API AtlasResource : public Resource {
   gd::String file;
 };
 
+/**
+ * \brief Describe a video file used by a project.
+ *
+ * \see Resource
+ * \ingroup ResourcesManagement
+ */
+class GD_CORE_API JavaScriptResource : public Resource {
+ public:
+  JavaScriptResource() : Resource() { SetKind("javascript"); };
+  virtual ~JavaScriptResource(){};
+  virtual JavaScriptResource* Clone() const override {
+    return new JavaScriptResource(*this);
+  }
+
+  virtual const gd::String& GetFile() const override { return file; };
+  virtual void SetFile(const gd::String& newFile) override;
+
+  virtual bool UseFile() const override { return true; }
+  void SerializeTo(SerializerElement& element) const override;
+
+  void UnserializeFrom(const SerializerElement& element) override;
+
+ private:
+  gd::String file;
+};
+
 /**
  * \brief Inventory all resources used by a project
  *

Core/GDCore/Project/SourceFile.cpp

@@ -1,36 +0,0 @@
-/*
- * GDevelop Core
- * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
- * reserved. This project is released under the MIT License.
- */
-
-#if defined(GD_IDE_ONLY)
-#include "GDCore/Project/SourceFile.h"
-#include "GDCore/CommonTools.h"
-#include "GDCore/Serialization/SerializerElement.h"
-
-namespace gd {
-
-SourceFile::SourceFile() : gdManaged(false) {
-  // ctor
-}
-
-SourceFile::~SourceFile() {
-  // dtor
-}
-
-void SourceFile::SerializeTo(SerializerElement& element) const {
-  element.SetAttribute("filename", filename);
-  element.SetAttribute("language", language);
-  element.SetAttribute("gdManaged", gdManaged);
-}
-
-void SourceFile::UnserializeFrom(const SerializerElement& element) {
-  filename = element.GetStringAttribute("filename");
-  language = element.GetStringAttribute("language", "C++");
-  gdManaged = element.GetBoolAttribute("gdManaged");
-}
-
-}  // namespace gd
-
-#endif

Core/GDCore/Project/SourceFile.h

@@ -1,92 +0,0 @@
-/*
- * GDevelop Core
- * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
- * reserved. This project is released under the MIT License.
- */
-#ifndef SOURCEFILE_H
-#define SOURCEFILE_H
-#include <ctime>
-#include <memory>
-#include "GDCore/String.h"
-namespace gd {
-class SerializerElement;
-}
-class BaseEvent;
-
-namespace gd {
-
-/**
- * \brief Represents a "physical" source file.
- *
- * Source file can be compiled (or just integrated to the exported project)
- * by platforms. Most of the time, special events are provided to use functions
- * created in such files.
- */
-class GD_CORE_API SourceFile {
- public:
-  SourceFile();
-  virtual ~SourceFile();
-
-  /**
-   * \brief Return a pointer to a new SourceFile constructed from this one.
-   */
-  SourceFile* Clone() const { return new SourceFile(*this); };
-
-  /**
-   * \brief Get the filename
-   */
-  gd::String GetFileName() const { return filename; };
-
-  /**
-   * \brief Change the filename
-   */
-  void SetFileName(gd::String filename_) { filename = filename_; };
-
-  /**
-   * \brief Serialize the source file.
-   */
-  void SerializeTo(SerializerElement& element) const;
-
-  /**
-   * \brief Unserialize the source file.
-   */
-  void UnserializeFrom(const SerializerElement& element);
-
-  /**
-   * \brief Set if the file is hidden from the user point of view and is only
-   * managed by GDevelop
-   */
-  void SetGDManaged(bool gdManaged_) { gdManaged = gdManaged_; };
-
-  /**
-   * \brief Return true if the file is hidden from the user point of view and is
-   * only managed by GDevelop
-   */
-  bool IsGDManaged() const { return gdManaged; };
-
-  /**
-   * \brief Change the language of the source file
-   */
-  void SetLanguage(gd::String lang) { language = lang; }
-
-  /**
-   * \brief Get the language of the source file
-   */
-  const gd::String& GetLanguage() const { return language; }
-
- private:
-  gd::String filename;  ///< Filename
-  bool gdManaged;  ///< True if the source file is hidden from the user point of
-                   ///< view and is managed only by GDevelop.
-  gd::String language;  ///< String identifying the language of this source file
-                        ///< (typically "C++ or "Javascript").
-  std::weak_ptr<BaseEvent>
-      associatedGdEvent;  ///< When a source file is GD-managed, it is usually
-                          ///< created for a specific event. This member is not
-                          ///< saved: It is the event responsibility to call
-                          ///< SetAssociatedEvent.
-};
-
-}  // namespace gd
-
-#endif  // SOURCEFILE_H

Core/GDCore/Project/VariablesContainer.h

@@ -34,7 +34,9 @@ class GD_CORE_API VariablesContainer {
       Object,
       Local,
       ExtensionGlobal,
-      ExtensionScene
+      ExtensionScene,
+      Parameters,
+      Properties,
   };
 
   VariablesContainer();

Core/GDCore/Project/VariablesContainersList.cpp

@@ -6,6 +6,7 @@
 #include "GDCore/Project/Project.h"
 #include "GDCore/Project/Variable.h"
 #include "GDCore/Project/EventsFunctionsExtension.h"
+#include "GDCore/IDE/EventsFunctionTools.h"
 
 namespace gd {
 
@@ -41,6 +42,78 @@ VariablesContainersList::MakeNewVariablesContainersListForEventsFunctionsExtensi
   return variablesContainersList;
 }
 
+VariablesContainersList
+VariablesContainersList::MakeNewVariablesContainersListForFreeEventsFunction(
+    const gd::EventsFunctionsExtension &extension,
+    const gd::EventsFunction &eventsFunction,
+    gd::VariablesContainer &parameterVariablesContainer) {
+  VariablesContainersList variablesContainersList;
+  variablesContainersList.Push(extension.GetGlobalVariables());
+  variablesContainersList.Push(extension.GetSceneVariables());
+
+  gd::EventsFunctionTools::ParametersToVariablesContainer(
+      eventsFunction.GetParametersForEvents(extension.GetEventsFunctions()),
+      parameterVariablesContainer);
+  variablesContainersList.Push(parameterVariablesContainer);
+
+  variablesContainersList.firstLocalVariableContainerIndex = 3;
+  return variablesContainersList;
+}
+
+VariablesContainersList VariablesContainersList::
+    MakeNewVariablesContainersListForBehaviorEventsFunction(
+        const gd::EventsFunctionsExtension &extension,
+        const gd::EventsBasedBehavior &eventsBasedBehavior,
+        const gd::EventsFunction &eventsFunction,
+        gd::VariablesContainer &parameterVariablesContainer,
+        gd::VariablesContainer &propertyVariablesContainer) {
+  VariablesContainersList variablesContainersList;
+  variablesContainersList.Push(extension.GetGlobalVariables());
+  variablesContainersList.Push(extension.GetSceneVariables());
+
+  gd::EventsFunctionTools::PropertiesToVariablesContainer(
+      eventsBasedBehavior.GetSharedPropertyDescriptors(), propertyVariablesContainer);
+  variablesContainersList.Push(propertyVariablesContainer);
+
+  gd::EventsFunctionTools::PropertiesToVariablesContainer(
+      eventsBasedBehavior.GetPropertyDescriptors(), propertyVariablesContainer);
+  variablesContainersList.Push(propertyVariablesContainer);
+
+  gd::EventsFunctionTools::ParametersToVariablesContainer(
+      eventsFunction.GetParametersForEvents(
+          eventsBasedBehavior.GetEventsFunctions()),
+      parameterVariablesContainer);
+  variablesContainersList.Push(parameterVariablesContainer);
+
+  variablesContainersList.firstLocalVariableContainerIndex = 5;
+  return variablesContainersList;
+}
+
+VariablesContainersList
+VariablesContainersList::MakeNewVariablesContainersListForObjectEventsFunction(
+    const gd::EventsFunctionsExtension &extension,
+    const gd::EventsBasedObject &eventsBasedObject,
+    const gd::EventsFunction &eventsFunction,
+    gd::VariablesContainer &parameterVariablesContainer,
+    gd::VariablesContainer &propertyVariablesContainer) {
+  VariablesContainersList variablesContainersList;
+  variablesContainersList.Push(extension.GetGlobalVariables());
+  variablesContainersList.Push(extension.GetSceneVariables());
+
+  gd::EventsFunctionTools::PropertiesToVariablesContainer(
+      eventsBasedObject.GetPropertyDescriptors(), propertyVariablesContainer);
+  variablesContainersList.Push(propertyVariablesContainer);
+
+  gd::EventsFunctionTools::ParametersToVariablesContainer(
+      eventsFunction.GetParametersForEvents(
+          eventsBasedObject.GetEventsFunctions()),
+      parameterVariablesContainer);
+  variablesContainersList.Push(parameterVariablesContainer);
+
+  variablesContainersList.firstLocalVariableContainerIndex = 4;
+  return variablesContainersList;
+}
+
 VariablesContainersList
 VariablesContainersList::MakeNewVariablesContainersListPushing(
     const VariablesContainersList& variablesContainersList, const gd::VariablesContainer& variablesContainer) {
@@ -74,7 +147,7 @@ const Variable& VariablesContainersList::Get(const gd::String& name) const {
 }
 
 const VariablesContainer &
-VariablesContainersList::GetVariablesContainerFromVariableName(
+VariablesContainersList::GetVariablesContainerFromVariableOrPropertyOrParameterName(
     const gd::String &variableName) const {
   for (auto it = variablesContainers.rbegin(); it != variablesContainers.rend();
        ++it) {
@@ -84,6 +157,34 @@ VariablesContainersList::GetVariablesContainerFromVariableName(
   return badVariablesContainer;
 }
 
+const VariablesContainer &VariablesContainersList::
+    GetVariablesContainerFromVariableOrPropertyName(
+        const gd::String &variableName) const {
+  for (auto it = variablesContainers.rbegin(); it != variablesContainers.rend();
+       ++it) {
+    if ((*it)->GetSourceType() !=
+            gd::VariablesContainer::SourceType::Parameters &&
+        (*it)->Has(variableName))
+      return **it;
+  }
+  return badVariablesContainer;
+}
+
+const VariablesContainer &VariablesContainersList::
+    GetVariablesContainerFromVariableNameOnly(
+        const gd::String &variableName) const {
+  for (auto it = variablesContainers.rbegin(); it != variablesContainers.rend();
+       ++it) {
+    if ((*it)->GetSourceType() !=
+            gd::VariablesContainer::SourceType::Parameters &&
+        (*it)->GetSourceType() !=
+            gd::VariablesContainer::SourceType::Properties &&
+        (*it)->Has(variableName))
+      return **it;
+  }
+  return badVariablesContainer;
+}
+
 std::size_t
 VariablesContainersList::GetVariablesContainerPositionFromVariableName(
     const gd::String &variableName) const {

Core/GDCore/Project/VariablesContainersList.h

@@ -1,6 +1,6 @@
 #pragma once
-#include <vector>
 #include <functional>
+#include <vector>
 
 namespace gd {
 class String;
@@ -9,7 +9,10 @@ class Layout;
 class VariablesContainer;
 class Variable;
 class EventsFunctionsExtension;
-}  // namespace gd
+class EventsBasedBehavior;
+class EventsBasedObject;
+class EventsFunction;
+} // namespace gd
 
 namespace gd {
 
@@ -24,20 +27,42 @@ namespace gd {
  * \ingroup PlatformDefinition
  */
 class GD_CORE_API VariablesContainersList {
- public:
+public:
   virtual ~VariablesContainersList(){};
 
   static VariablesContainersList
-  MakeNewVariablesContainersListForProjectAndLayout(const gd::Project& project,
-                                                    const gd::Layout& layout);
+  MakeNewVariablesContainersListForProjectAndLayout(const gd::Project &project,
+                                                    const gd::Layout &layout);
 
   static VariablesContainersList
-  MakeNewVariablesContainersListForProject(const gd::Project& project);
+  MakeNewVariablesContainersListForProject(const gd::Project &project);
 
   static VariablesContainersList
   MakeNewVariablesContainersListForEventsFunctionsExtension(
       const gd::EventsFunctionsExtension &extension);
 
+  static VariablesContainersList
+  MakeNewVariablesContainersListForFreeEventsFunction(
+      const gd::EventsFunctionsExtension &extension,
+      const gd::EventsFunction &eventsFunction,
+      gd::VariablesContainer &parameterVariablesContainer);
+
+  static VariablesContainersList
+  MakeNewVariablesContainersListForBehaviorEventsFunction(
+      const gd::EventsFunctionsExtension &extension,
+      const gd::EventsBasedBehavior &eventsBasedBehavior,
+      const gd::EventsFunction &eventsFunction,
+      gd::VariablesContainer &parameterVariablesContainer,
+      gd::VariablesContainer &propertyVariablesContainer);
+
+  static VariablesContainersList
+  MakeNewVariablesContainersListForObjectEventsFunction(
+      const gd::EventsFunctionsExtension &extension,
+      const gd::EventsBasedObject &eventsBasedObject,
+      const gd::EventsFunction &eventsFunction,
+      gd::VariablesContainer &parameterVariablesContainer,
+      gd::VariablesContainer &propertyVariablesContainer);
+
   static VariablesContainersList MakeNewVariablesContainersListPushing(
       const VariablesContainersList &variablesContainersList,
       const gd::VariablesContainer &variablesContainer);
@@ -50,28 +75,31 @@ class GD_CORE_API VariablesContainersList {
   /**
    * \brief Return true if the specified variable is in one of the containers.
    */
-  bool Has(const gd::String& name) const;
+  bool Has(const gd::String &name) const;
 
   /**
    * \brief Return a reference to the variable called \a name.
    */
-  const Variable& Get(const gd::String& name) const;
+  const Variable &Get(const gd::String &name) const;
 
   /**
    * \brief Return true if the specified variable container is present.
    */
-  bool HasVariablesContainer(const gd::VariablesContainer& variablesContainer) const;
+  bool
+  HasVariablesContainer(const gd::VariablesContainer &variablesContainer) const;
 
-  // TODO: Rename GetTopMostVariablesContainer and GetBottomMostVariablesContainer
-  // to give a clearer access to segments of the container list.
-  // For instance, a project tree segment and an event tree segment.
+  // TODO: Rename GetTopMostVariablesContainer and
+  // GetBottomMostVariablesContainer to give a clearer access to segments of the
+  // container list. For instance, a project tree segment and an event tree
+  // segment.
 
   /**
-   * Get the variables container at the top of the scope (so the most "global" one).
-   * \brief Avoid using apart when a scope must be forced.
+   * Get the variables container at the top of the scope (so the most "global"
+   * one). \brief Avoid using apart when a scope must be forced.
    */
-  const VariablesContainer* GetTopMostVariablesContainer() const {
-    if (variablesContainers.empty()) return nullptr;
+  const VariablesContainer *GetTopMostVariablesContainer() const {
+    if (variablesContainers.empty())
+      return nullptr;
     return variablesContainers.front();
   };
 
@@ -80,16 +108,29 @@ class GD_CORE_API VariablesContainersList {
    * (so the most "local" one) excluding local variables.
    * \brief Avoid using apart when a scope must be forced.
    */
-  const VariablesContainer* GetBottomMostVariablesContainer() const {
-    if (variablesContainers.empty()) return nullptr;
+  const VariablesContainer *GetBottomMostVariablesContainer() const {
+    if (variablesContainers.empty())
+      return nullptr;
     return variablesContainers.at(firstLocalVariableContainerIndex - 1);
   }
 
+  /**
+   * Get the variables container for a given variable or property or parameter.
+   */
+  const VariablesContainer &
+  GetVariablesContainerFromVariableOrPropertyOrParameterName(const gd::String &variableName) const;
+
+  /**
+   * Get the variables container for a given variable or property.
+   */
+  const VariablesContainer &
+  GetVariablesContainerFromVariableOrPropertyName(const gd::String &variableName) const;
+
   /**
    * Get the variables container for a given variable.
    */
   const VariablesContainer &
-  GetVariablesContainerFromVariableName(const gd::String &variableName) const;
+  GetVariablesContainerFromVariableNameOnly(const gd::String &variableName) const;
 
   /**
    * Get the variables container index for a given variable.
@@ -109,43 +150,47 @@ class GD_CORE_API VariablesContainersList {
    * \warning Trying to access to a not existing variable container will result
    * in undefined behavior.
    */
-  const gd::VariablesContainer& GetVariablesContainer(std::size_t index) const {
+  const gd::VariablesContainer &GetVariablesContainer(std::size_t index) const {
     return *variablesContainers.at(index);
   }
 
   /**
    * \brief Return the number variable containers.
    */
-  std::size_t GetVariablesContainersCount() const { return variablesContainers.size(); }
+  std::size_t GetVariablesContainersCount() const {
+    return variablesContainers.size();
+  }
 
   /**
-   * \brief Call the callback for each variable having a name matching the specified search.
+   * \brief Call the callback for each variable having a name matching the
+   * specified search.
    */
-  void ForEachVariableMatchingSearch(const gd::String& search, std::function<void(const gd::String& name, const gd::Variable& variable)> fn) const;
+  void ForEachVariableMatchingSearch(
+      const gd::String &search,
+      std::function<void(const gd::String &name, const gd::Variable &variable)>
+          fn) const;
 
   /**
    * \brief Push a new variables container to the context.
    */
-  void Push(const gd::VariablesContainer& variablesContainer) {
+  void Push(const gd::VariablesContainer &variablesContainer) {
     variablesContainers.push_back(&variablesContainer);
   };
 
   /**
    * \brief Pop a variables container from the context.
    */
-  void Pop() {
-    variablesContainers.pop_back();
-  };
+  void Pop() { variablesContainers.pop_back(); };
 
+  /** Do not use - should be private but accessible to let Emscripten create a
+   * temporary. */
+  VariablesContainersList() : firstLocalVariableContainerIndex(0){};
 
-  /** Do not use - should be private but accessible to let Emscripten create a temporary. */
-  VariablesContainersList(): firstLocalVariableContainerIndex(0) {};
- private:
-
-  std::vector<const gd::VariablesContainer*> variablesContainers;
+private:
+  std::vector<const gd::VariablesContainer *> variablesContainers;
   std::size_t firstLocalVariableContainerIndex;
   static Variable badVariable;
   static VariablesContainer badVariablesContainer;
 };
 
-}  // namespace gd
+} // namespace gd

Core/GDCore/Tools/Localization.cpp

@@ -6,6 +6,7 @@
 
 #if defined(EMSCRIPTEN)
 #include <emscripten.h>
+
 #include "GDCore/String.h"
 
 namespace gd {
@@ -31,5 +32,10 @@ gd::String GetTranslation(const char* str) {  // TODO: Inline?
       str);
   return gd::String(translatedStr);  // TODO: Is copying necessary?
 }
+
+gd::String GetTranslation(const gd::String& str) {
+  return GetTranslation(str.c_str());
+}
+
 }  // namespace gd
 #endif

Core/GDCore/Tools/Localization.h

@@ -8,10 +8,10 @@
 
 /** @file
  * Provide a way to mark strings to be translated.
- * 
+ *
  * Strings to be translated in GDevelop Core codebase
  * are marked with the underscore macro, for example: _("Hello World").
- * 
+ *
  * The macro is then defined to be using the translation function
  * of the underlying platform (Emscripten for GDevelop 5).
  */
@@ -26,8 +26,10 @@
 #endif
 
 namespace gd {
+gd::String GetTranslation(const gd::String& str);
+
 gd::String GetTranslation(const char* str);
-}
+}  // namespace gd
 
 #define _(s) gd::GetTranslation(u8##s)
 

Core/tests/ArbitraryResourceWorker.cpp

@@ -268,8 +268,9 @@ TEST_CASE("ArbitraryResourceWorker", "[common][resources]") {
       ArbitraryResourceWorkerTest worker(project.GetResourcesManager());
 
       auto& extension = project.InsertNewEventsFunctionsExtension("MyEventExtension", 0);
-      auto& function = extension.InsertNewEventsFunction("MyFreeFunction", 0);
-      
+      auto &function = extension.GetEventsFunctions().InsertNewEventsFunction(
+          "MyFreeFunction", 0);
+
       gd::StandardEvent standardEvent;
       gd::Instruction instruction;
       instruction.SetType("MyExtension::DoSomethingWithResources");
@@ -777,8 +778,9 @@ TEST_CASE("ArbitraryResourceWorker", "[common][resources]") {
       ArbitraryResourceWorkerTest worker(project.GetResourcesManager());
 
       auto& extension = project.InsertNewEventsFunctionsExtension("MyEventExtension", 0);
-      auto& function = extension.InsertNewEventsFunction("MyFreeFunction", 0);
-      
+      auto &function = extension.GetEventsFunctions().InsertNewEventsFunction(
+          "MyFreeFunction", 0);
+
       gd::StandardEvent standardEvent;
       gd::Instruction instruction;
       instruction.SetType("MyExtension::DoSomethingWithResources");

Core/tests/DependenciesAnalyzer.cpp

@@ -32,7 +32,6 @@ TEST_CASE("DependenciesAnalyzer", "[common]") {
     REQUIRE(analyzer.GetScenesDependencies().find("Layout2") !=
             analyzer.GetScenesDependencies().end());
     REQUIRE(analyzer.GetExternalEventsDependencies().size() == 0);
-    REQUIRE(analyzer.GetSourceFilesDependencies().size() == 0);
   }
 
   SECTION("Can detect a simple external events dependency") {
@@ -55,7 +54,6 @@ TEST_CASE("DependenciesAnalyzer", "[common]") {
     REQUIRE(analyzer.GetExternalEventsDependencies().size() == 1);
     REQUIRE(analyzer.GetExternalEventsDependencies().find("ExternalEvents1") !=
             analyzer.GetExternalEventsDependencies().end());
-    REQUIRE(analyzer.GetSourceFilesDependencies().size() == 0);
   }
 
   SECTION("Can detect a transitive scene and external events dependency") {
@@ -87,7 +85,6 @@ TEST_CASE("DependenciesAnalyzer", "[common]") {
     REQUIRE(analyzer.GetExternalEventsDependencies().size() == 1);
     REQUIRE(analyzer.GetExternalEventsDependencies().find("ExternalEvents1") !=
             analyzer.GetExternalEventsDependencies().end());
-    REQUIRE(analyzer.GetSourceFilesDependencies().size() == 0);
   }
 
   SECTION("Can detect a (nested) circular dependency with scenes") {

Core/tests/DummyPlatform.cpp

@@ -263,6 +263,46 @@ void SetupProjectWithDummyPlatform(gd::Project& project,
   extension->SetExtensionInformation(
       "BuiltinVariables", "My testing extension for variables", "", "", "");
 
+  extension
+      ->AddCondition("NumberVariable",
+                    "Variable value",
+                    "Compare the number value of a variable.",
+                    "The variable _PARAM0_",
+                    "",
+                    "",
+                    "")
+      .AddParameter("variableOrPropertyOrParameter", _("Variable"))
+      .UseStandardRelationalOperatorParameters(
+          "number", gd::ParameterOptions::MakeNewOptions());
+
+  extension
+      ->AddCondition("StringVariable",
+                    "Variable value",
+                    "Compare the text (string) of a variable.",
+                    "The variable _PARAM0_",
+                    "",
+                    "",
+                    "")
+      .AddParameter("variableOrPropertyOrParameter", _("Variable"))
+      .UseStandardRelationalOperatorParameters(
+          "string", gd::ParameterOptions::MakeNewOptions());
+
+  extension
+      ->AddCondition(
+          "BooleanVariable",
+          "Variable value",
+          "Compare the boolean value of a variable.",
+          "The variable _PARAM0_ is _PARAM1_",
+          "",
+          "",
+          "")
+      .AddParameter("variableOrPropertyOrParameter", _("Variable"))
+      .AddParameter("trueorfalse", _("Check if the value is"))
+      .SetDefaultValue("true")
+      // This parameter allows to keep the operand expression
+      // when the editor switch between variable instructions.
+      .AddCodeOnlyParameter("trueorfalse", "");
+
   extension
       ->AddAction("SetNumberVariable",
                   "Change variable value",
@@ -271,7 +311,7 @@ void SetupProjectWithDummyPlatform(gd::Project& project,
                   "",
                   "",
                   "")
-      .AddParameter("variable", "Variable")
+      .AddParameter("variableOrProperty", "Variable")
       .AddParameter("operator", "Operator", "number")
       .AddParameter("number", "Value")
       .SetFunctionName("setNumberVariable");
@@ -284,7 +324,7 @@ void SetupProjectWithDummyPlatform(gd::Project& project,
                   "",
                   "",
                   "")
-      .AddParameter("variable", "Variable")
+      .AddParameter("variableOrProperty", "Variable")
       .AddParameter("operator", "Operator", "string")
       .AddParameter("string", "Value")
       .SetFunctionName("setStringVariable");
@@ -297,7 +337,7 @@ void SetupProjectWithDummyPlatform(gd::Project& project,
                   "",
                   "",
                   "")
-      .AddParameter("variable", "Variable")
+      .AddParameter("variableOrProperty", "Variable")
       .AddParameter("operator", "Operator", "boolean")
       // This parameter allows to keep the operand expression
       // when the editor switch between variable instructions.

Core/tests/EventsFunctionsContainer.cpp

@@ -38,6 +38,8 @@ TEST_CASE("EventsFunctionsContainer", "[common]") {
             "Function2.x");
     REQUIRE(eventsFunctionContainer.GetEventsFunction(2).GetName() ==
             "Function3");
+    REQUIRE(eventsFunctionContainer.GetOwner() ==
+            gd::EventsFunctionsContainer::FunctionOwner::Extension);
     REQUIRE(eventsFunctionContainer2.GetEventsFunctionsCount() == 3);
     REQUIRE(eventsFunctionContainer2.GetEventsFunction(0).GetName() ==
             "Function1.y");

Core/tests/EventsFunctionsExtension.cpp

@@ -11,9 +11,10 @@
 TEST_CASE("EventsFunctionsExtension", "[common]") {
   SECTION("Sanity checks") {
     gd::EventsFunctionsExtension eventsFunctionExtension;
-    eventsFunctionExtension.InsertNewEventsFunction("Function1", 0);
-    eventsFunctionExtension.InsertNewEventsFunction("Function2", 1);
-    eventsFunctionExtension.InsertNewEventsFunction("Function3", 2);
+    auto &freeEventsFunctions = eventsFunctionExtension.GetEventsFunctions();
+    freeEventsFunctions.InsertNewEventsFunction("Function1", 0);
+    freeEventsFunctions.InsertNewEventsFunction("Function2", 1);
+    freeEventsFunctions.InsertNewEventsFunction("Function3", 2);
     eventsFunctionExtension.GetEventsBasedBehaviors().InsertNew("MyBehavior",
                                                                 0);
     eventsFunctionExtension.GetEventsBasedBehaviors().InsertNew("MyBehavior2",
@@ -22,12 +23,13 @@ TEST_CASE("EventsFunctionsExtension", "[common]") {
     // Check that copy operator is working
     gd::EventsFunctionsExtension eventsFunctionExtension2 =
         eventsFunctionExtension;
-    REQUIRE(eventsFunctionExtension2.GetEventsFunctionsCount() == 3);
-    REQUIRE(eventsFunctionExtension2.GetEventsFunction(0).GetName() ==
+    auto &freeEventsFunctions2 = eventsFunctionExtension2.GetEventsFunctions();
+    REQUIRE(freeEventsFunctions2.GetEventsFunctionsCount() == 3);
+    REQUIRE(freeEventsFunctions2.GetEventsFunction(0).GetName() ==
             "Function1");
-    REQUIRE(eventsFunctionExtension2.GetEventsFunction(1).GetName() ==
+    REQUIRE(freeEventsFunctions2.GetEventsFunction(1).GetName() ==
             "Function2");
-    REQUIRE(eventsFunctionExtension2.GetEventsFunction(2).GetName() ==
+    REQUIRE(freeEventsFunctions2.GetEventsFunction(2).GetName() ==
             "Function3");
     REQUIRE(eventsFunctionExtension2.GetEventsBasedBehaviors().GetCount() == 2);
     REQUIRE(
@@ -39,21 +41,21 @@ TEST_CASE("EventsFunctionsExtension", "[common]") {
 
     // Check that the copy has not somehow shared the same pointers
     // to the events functions.
-    eventsFunctionExtension.GetEventsFunction(1).SetName("Function2.x");
-    eventsFunctionExtension2.GetEventsFunction(0).SetName("Function1.y");
-    REQUIRE(eventsFunctionExtension.GetEventsFunctionsCount() == 3);
-    REQUIRE(eventsFunctionExtension.GetEventsFunction(0).GetName() ==
+    freeEventsFunctions.GetEventsFunction(1).SetName("Function2.x");
+    freeEventsFunctions2.GetEventsFunction(0).SetName("Function1.y");
+    REQUIRE(freeEventsFunctions.GetEventsFunctionsCount() == 3);
+    REQUIRE(freeEventsFunctions.GetEventsFunction(0).GetName() ==
             "Function1");
-    REQUIRE(eventsFunctionExtension.GetEventsFunction(1).GetName() ==
+    REQUIRE(freeEventsFunctions.GetEventsFunction(1).GetName() ==
             "Function2.x");
-    REQUIRE(eventsFunctionExtension.GetEventsFunction(2).GetName() ==
+    REQUIRE(freeEventsFunctions.GetEventsFunction(2).GetName() ==
             "Function3");
-    REQUIRE(eventsFunctionExtension2.GetEventsFunctionsCount() == 3);
-    REQUIRE(eventsFunctionExtension2.GetEventsFunction(0).GetName() ==
+    REQUIRE(freeEventsFunctions2.GetEventsFunctionsCount() == 3);
+    REQUIRE(freeEventsFunctions2.GetEventsFunction(0).GetName() ==
             "Function1.y");
-    REQUIRE(eventsFunctionExtension2.GetEventsFunction(1).GetName() ==
+    REQUIRE(freeEventsFunctions2.GetEventsFunction(1).GetName() ==
             "Function2");
-    REQUIRE(eventsFunctionExtension2.GetEventsFunction(2).GetName() ==
+    REQUIRE(freeEventsFunctions2.GetEventsFunction(2).GetName() ==
             "Function3");
   }
 }

Core/tests/ExpressionParser2.cpp

@@ -2035,6 +2035,319 @@ TEST_CASE("ExpressionParser2", "[common][events]") {
     }
   }
 
+  SECTION("Valid property (in variableOrPropertyOrParameter parameter)") {
+    {
+      gd::PropertiesContainer propertiesContainer(
+          gd::EventsFunctionsContainer::Extension);
+
+      auto projectScopedContainersWithProperties = gd::ProjectScopedContainers::
+          MakeNewProjectScopedContainersForProjectAndLayout(project, layout1);
+      projectScopedContainersWithProperties.AddPropertiesContainer(
+          propertiesContainer);
+
+      propertiesContainer.InsertNew("MyProperty");
+
+      auto node = parser.ParseExpression("MyProperty");
+
+      gd::ExpressionValidator validator(platform,
+                                        projectScopedContainersWithProperties,
+                                        "variableOrPropertyOrParameter");
+      node->Visit(validator);
+      REQUIRE(validator.GetAllErrors().size() == 0);
+    }
+  }
+
+  SECTION("Valid property (in variableOrProperty parameter)") {
+    {
+      gd::PropertiesContainer propertiesContainer(
+          gd::EventsFunctionsContainer::Extension);
+
+      auto projectScopedContainersWithProperties = gd::ProjectScopedContainers::
+          MakeNewProjectScopedContainersForProjectAndLayout(project, layout1);
+      projectScopedContainersWithProperties.AddPropertiesContainer(
+          propertiesContainer);
+
+      propertiesContainer.InsertNew("MyProperty");
+
+      auto node = parser.ParseExpression("MyProperty");
+
+      gd::ExpressionValidator validator(platform,
+                                        projectScopedContainersWithProperties,
+                                        "variableOrProperty");
+      node->Visit(validator);
+      REQUIRE(validator.GetAllErrors().size() == 0);
+    }
+  }
+
+  SECTION("Invalid property (in variable parameter)") {
+    {
+      gd::PropertiesContainer propertiesContainer(
+          gd::EventsFunctionsContainer::Extension);
+
+      auto projectScopedContainersWithProperties = gd::ProjectScopedContainers::
+          MakeNewProjectScopedContainersForProjectAndLayout(project, layout1);
+      projectScopedContainersWithProperties.AddPropertiesContainer(
+          propertiesContainer);
+
+      propertiesContainer.InsertNew("MyProperty");
+
+      auto node = parser.ParseExpression("MyProperty");
+
+      gd::ExpressionValidator validator(
+          platform, projectScopedContainersWithProperties, "variable");
+      node->Visit(validator);
+      REQUIRE(validator.GetAllErrors().size() == 1);
+      REQUIRE(validator.GetAllErrors()[0]->GetMessage() ==
+              "This variable has the same name as a property. Consider "
+              "renaming one or the other.");
+    }
+  }
+
+  SECTION("Invalid property (property with child in variableOrProperty parameter)") {
+    {
+      gd::PropertiesContainer propertiesContainer(
+          gd::EventsFunctionsContainer::Extension);
+
+      auto projectScopedContainersWithProperties = gd::ProjectScopedContainers::
+          MakeNewProjectScopedContainersForProjectAndLayout(project, layout1);
+      projectScopedContainersWithProperties.AddPropertiesContainer(
+          propertiesContainer);
+
+      propertiesContainer.InsertNew("MyProperty");
+
+      {
+        auto node = parser.ParseExpression("MyProperty.MyChild");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithProperties,
+                                          "variableOrProperty");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+
+      {
+        auto node = parser.ParseExpression("MyProperty.MyChild.MyGrandChild");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithProperties,
+                                          "variableOrProperty");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+
+      {
+        auto node = parser.ParseExpression("MyProperty[\"MyChild\"]");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithProperties,
+                                          "variableOrProperty");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+
+      {
+        auto node = parser.ParseExpression("MyProperty[0]");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithProperties,
+                                          "variableOrProperty");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+    }
+  }
+
+  SECTION("Invalid property (property with child in variableOrPropertyOrParameter parameter)") {
+    {
+      gd::PropertiesContainer propertiesContainer(
+          gd::EventsFunctionsContainer::Extension);
+
+      auto projectScopedContainersWithProperties = gd::ProjectScopedContainers::
+          MakeNewProjectScopedContainersForProjectAndLayout(project, layout1);
+      projectScopedContainersWithProperties.AddPropertiesContainer(
+          propertiesContainer);
+
+      propertiesContainer.InsertNew("MyProperty");
+
+      {
+        auto node = parser.ParseExpression("MyProperty.MyChild");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithProperties,
+                                          "variableOrPropertyOrParameter");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+
+      {
+        auto node = parser.ParseExpression("MyProperty.MyChild.MyGrandChild");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithProperties,
+                                          "variableOrPropertyOrParameter");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+
+      {
+        auto node = parser.ParseExpression("MyProperty[\"MyChild\"]");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithProperties,
+                                          "variableOrPropertyOrParameter");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+
+      {
+        auto node = parser.ParseExpression("MyProperty[0]");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithProperties,
+                                          "variableOrPropertyOrParameter");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+    }
+  }
+
+  SECTION("Valid parameter (in variableOrPropertyOrParameter parameter)") {
+    {
+      gd::ParameterMetadataContainer parameters;
+      parameters.InsertNewParameter("MyParameter", 0).SetType("number");
+
+      auto projectScopedContainersWithParameters = gd::ProjectScopedContainers::
+          MakeNewProjectScopedContainersForProjectAndLayout(project, layout1);
+      projectScopedContainersWithParameters.AddParameters(parameters);
+
+      auto node = parser.ParseExpression("MyParameter");
+
+      gd::ExpressionValidator validator(platform,
+                                        projectScopedContainersWithParameters,
+                                        "variableOrPropertyOrParameter");
+      node->Visit(validator);
+      REQUIRE(validator.GetAllErrors().size() == 0);
+    }
+  }
+
+  SECTION("Invalid parameter (in variableOrProperty parameter)") {
+    {
+      gd::ParameterMetadataContainer parameters;
+      parameters.InsertNewParameter("MyParameter", 0).SetType("number");
+
+      auto projectScopedContainersWithParameters = gd::ProjectScopedContainers::
+          MakeNewProjectScopedContainersForProjectAndLayout(project, layout1);
+      projectScopedContainersWithParameters.AddParameters(parameters);
+
+      auto node = parser.ParseExpression("MyParameter");
+
+      gd::ExpressionValidator validator(platform,
+                                        projectScopedContainersWithParameters,
+                                        "variableOrProperty");
+      node->Visit(validator);
+      REQUIRE(validator.GetAllErrors().size() == 1);
+      REQUIRE(validator.GetAllErrors()[0]->GetMessage() ==
+              "This variable has the same name as a parameter. Consider "
+              "renaming one or the other.");
+    }
+  }
+
+  SECTION("Invalid parameter (in variable parameter)") {
+    {
+      gd::ParameterMetadataContainer parameters;
+      parameters.InsertNewParameter("MyParameter", 0).SetType("number");
+
+      auto projectScopedContainersWithParameters = gd::ProjectScopedContainers::
+          MakeNewProjectScopedContainersForProjectAndLayout(project, layout1);
+      projectScopedContainersWithParameters.AddParameters(parameters);
+
+      auto node = parser.ParseExpression("MyParameter");
+
+      gd::ExpressionValidator validator(
+          platform, projectScopedContainersWithParameters, "variable");
+      node->Visit(validator);
+      REQUIRE(validator.GetAllErrors().size() == 1);
+      REQUIRE(validator.GetAllErrors()[0]->GetMessage() ==
+              "This variable has the same name as a parameter. Consider "
+              "renaming one or the other.");
+    }
+  }
+
+  SECTION("Invalid parameter (parameter with child in variableOrPropertyOrParameter parameter)") {
+    {
+      gd::ParameterMetadataContainer parameters;
+      parameters.InsertNewParameter("MyParameter", 0).SetType("number");
+
+      auto projectScopedContainersWithParameters = gd::ProjectScopedContainers::
+          MakeNewProjectScopedContainersForProjectAndLayout(project, layout1);
+      projectScopedContainersWithParameters.AddParameters(parameters);
+
+      {
+        auto node = parser.ParseExpression("MyParameter.MyChild");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithParameters,
+                                          "variableOrPropertyOrParameter");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+
+      {
+        auto node = parser.ParseExpression("MyParameter.MyChild.MyGrandChild");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithParameters,
+                                          "variableOrPropertyOrParameter");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+
+      {
+        auto node = parser.ParseExpression("MyParameter[\"MyChild\"]");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithParameters,
+                                          "variableOrPropertyOrParameter");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+
+      {
+        auto node = parser.ParseExpression("MyParameter[0]");
+
+        gd::ExpressionValidator validator(platform,
+                                          projectScopedContainersWithParameters,
+                                          "variableOrPropertyOrParameter");
+        node->Visit(validator);
+        REQUIRE(validator.GetFatalErrors().size() == 1);
+        REQUIRE(validator.GetFatalErrors()[0]->GetMessage() ==
+                "Properties can't have children.");
+      }
+    }
+  }
+
   SECTION("Valid parameter") {
       gd::ParameterMetadataContainer parameters;
       parameters.InsertNewParameter("MyParameter1", 0).SetType("number");

Core/tests/PropertyFunctionGenerator.cpp

@@ -116,14 +116,11 @@ TEST_CASE("PropertyFunctionGenerator", "[common]") {
       REQUIRE(setterEvent.GetConditions().size() == 0);
       REQUIRE(setterEvent.GetActions().size() == 1);
       auto &setterAction = setterEvent.GetActions().at(0);
-      REQUIRE(
-          setterAction.GetType() ==
-          "MyEventsExtension::MyEventsBasedBehavior::SetPropertyMovementAngle");
-      REQUIRE(setterAction.GetParametersCount() == 4);
-      REQUIRE(setterAction.GetParameter(0).GetPlainString() == "Object");
-      REQUIRE(setterAction.GetParameter(1).GetPlainString() == "Behavior");
-      REQUIRE(setterAction.GetParameter(2).GetPlainString() == "=");
-      REQUIRE(setterAction.GetParameter(3).GetPlainString() == "Value");
+      REQUIRE(setterAction.GetType() == "SetNumberVariable");
+      REQUIRE(setterAction.GetParametersCount() == 3);
+      REQUIRE(setterAction.GetParameter(0).GetPlainString() == "MovementAngle");
+      REQUIRE(setterAction.GetParameter(1).GetPlainString() == "=");
+      REQUIRE(setterAction.GetParameter(2).GetPlainString() == "Value");
     }
   }
 
@@ -206,12 +203,12 @@ TEST_CASE("PropertyFunctionGenerator", "[common]") {
       REQUIRE(getterEvent.GetActions().size() == 1);
 
       auto &getterCondition = getterEvent.GetConditions().at(0);
-      REQUIRE(getterCondition.GetType() ==
-              "MyEventsExtension::MyEventsBasedBehavior::PropertyRotate");
+      REQUIRE(getterCondition.GetType() == "BooleanVariable");
       REQUIRE(!getterCondition.IsInverted());
-      REQUIRE(getterCondition.GetParametersCount() == 2);
-      REQUIRE(getterCondition.GetParameter(0).GetPlainString() == "Object");
-      REQUIRE(getterCondition.GetParameter(1).GetPlainString() == "Behavior");
+      REQUIRE(getterCondition.GetParametersCount() == 3);
+      REQUIRE(getterCondition.GetParameter(0).GetPlainString() == "Rotate");
+      REQUIRE(getterCondition.GetParameter(1).GetPlainString() == "True");
+      REQUIRE(getterCondition.GetParameter(2).GetPlainString() == "");
 
       auto &getterAction = getterEvent.GetActions().at(0);
       REQUIRE(getterAction.GetType() == "SetReturnBoolean");
@@ -257,19 +254,19 @@ TEST_CASE("PropertyFunctionGenerator", "[common]") {
       REQUIRE(setterNoEvent.GetActions().size() == 1);
 
       auto &setterNoCondition = setterNoEvent.GetConditions().at(0);
-      REQUIRE(setterNoCondition.GetType() == "GetArgumentAsBoolean");
-      REQUIRE(setterNoCondition.IsInverted());
-      REQUIRE(setterNoCondition.GetParametersCount() == 1);
-      REQUIRE(setterNoCondition.GetParameter(0).GetPlainString() ==
-              "\"Value\"");
+      REQUIRE(setterNoCondition.GetType() == "BooleanVariable");
+      REQUIRE(!setterNoCondition.IsInverted());
+      REQUIRE(setterNoCondition.GetParametersCount() == 3);
+      REQUIRE(setterNoCondition.GetParameter(0).GetPlainString() == "Value");
+      REQUIRE(setterNoCondition.GetParameter(1).GetPlainString() == "False");
+      REQUIRE(setterNoCondition.GetParameter(2).GetPlainString() == "");
 
       auto &setterNoAction = setterNoEvent.GetActions().at(0);
-      REQUIRE(setterNoAction.GetType() ==
-              "MyEventsExtension::MyEventsBasedBehavior::SetPropertyRotate");
+      REQUIRE(setterNoAction.GetType() == "SetBooleanVariable");
       REQUIRE(setterNoAction.GetParametersCount() == 3);
-      REQUIRE(setterNoAction.GetParameter(0).GetPlainString() == "Object");
-      REQUIRE(setterNoAction.GetParameter(1).GetPlainString() == "Behavior");
-      REQUIRE(setterNoAction.GetParameter(2).GetPlainString() == "no");
+      REQUIRE(setterNoAction.GetParameter(0).GetPlainString() == "Rotate");
+      REQUIRE(setterNoAction.GetParameter(1).GetPlainString() == "False");
+      REQUIRE(setterNoAction.GetParameter(2).GetPlainString() == "");
 
       auto &setterYesEvent =
           dynamic_cast<gd::StandardEvent &>(setter.GetEvents().GetEvent(1));
@@ -277,19 +274,19 @@ TEST_CASE("PropertyFunctionGenerator", "[common]") {
       REQUIRE(setterYesEvent.GetActions().size() == 1);
 
       auto &setterYesCondition = setterYesEvent.GetConditions().at(0);
-      REQUIRE(setterYesCondition.GetType() == "GetArgumentAsBoolean");
+      REQUIRE(setterYesCondition.GetType() == "BooleanVariable");
       REQUIRE(!setterYesCondition.IsInverted());
-      REQUIRE(setterYesCondition.GetParametersCount() == 1);
-      REQUIRE(setterYesCondition.GetParameter(0).GetPlainString() ==
-              "\"Value\"");
+      REQUIRE(setterYesCondition.GetParametersCount() == 3);
+      REQUIRE(setterYesCondition.GetParameter(0).GetPlainString() == "Value");
+      REQUIRE(setterYesCondition.GetParameter(1).GetPlainString() == "True");
+      REQUIRE(setterYesCondition.GetParameter(2).GetPlainString() == "");
 
       auto &setterYesAction = setterYesEvent.GetActions().at(0);
-      REQUIRE(setterYesAction.GetType() ==
-              "MyEventsExtension::MyEventsBasedBehavior::SetPropertyRotate");
+      REQUIRE(setterYesAction.GetType() == "SetBooleanVariable");
       REQUIRE(setterYesAction.GetParametersCount() == 3);
-      REQUIRE(setterYesAction.GetParameter(0).GetPlainString() == "Object");
-      REQUIRE(setterYesAction.GetParameter(1).GetPlainString() == "Behavior");
-      REQUIRE(setterYesAction.GetParameter(2).GetPlainString() == "yes");
+      REQUIRE(setterYesAction.GetParameter(0).GetPlainString() == "Rotate");
+      REQUIRE(setterYesAction.GetParameter(1).GetPlainString() == "True");
+      REQUIRE(setterYesAction.GetParameter(2).GetPlainString() == "");
     }
   }
   SECTION("Can generate functions for a number property in an object") {
@@ -366,11 +363,9 @@ TEST_CASE("PropertyFunctionGenerator", "[common]") {
       REQUIRE(setterEvent.GetConditions().size() == 0);
       REQUIRE(setterEvent.GetActions().size() == 1);
       auto &setterAction = setterEvent.GetActions().at(0);
-      REQUIRE(
-          setterAction.GetType() ==
-          "MyEventsExtension::MyEventsBasedObject::SetPropertyMovementAngle");
+      REQUIRE(setterAction.GetType() == "SetNumberVariable");
       REQUIRE(setterAction.GetParametersCount() == 3);
-      REQUIRE(setterAction.GetParameter(0).GetPlainString() == "Object");
+      REQUIRE(setterAction.GetParameter(0).GetPlainString() == "MovementAngle");
       REQUIRE(setterAction.GetParameter(1).GetPlainString() == "=");
       REQUIRE(setterAction.GetParameter(2).GetPlainString() == "Value");
     }
@@ -454,11 +449,12 @@ TEST_CASE("PropertyFunctionGenerator", "[common]") {
       REQUIRE(getterEvent.GetActions().size() == 1);
 
       auto &getterCondition = getterEvent.GetConditions().at(0);
-      REQUIRE(getterCondition.GetType() ==
-              "MyEventsExtension::MyEventsBasedObject::PropertyRotate");
+      REQUIRE(getterCondition.GetType() == "BooleanVariable");
       REQUIRE(!getterCondition.IsInverted());
-      REQUIRE(getterCondition.GetParametersCount() == 1);
-      REQUIRE(getterCondition.GetParameter(0).GetPlainString() == "Object");
+      REQUIRE(getterCondition.GetParametersCount() == 3);
+      REQUIRE(getterCondition.GetParameter(0).GetPlainString() == "Rotate");
+      REQUIRE(getterCondition.GetParameter(1).GetPlainString() == "True");
+      REQUIRE(getterCondition.GetParameter(2).GetPlainString() == "");
 
       auto &getterAction = getterEvent.GetActions().at(0);
       REQUIRE(getterAction.GetType() == "SetReturnBoolean");
@@ -500,18 +496,19 @@ TEST_CASE("PropertyFunctionGenerator", "[common]") {
       REQUIRE(setterNoEvent.GetActions().size() == 1);
 
       auto &setterNoCondition = setterNoEvent.GetConditions().at(0);
-      REQUIRE(setterNoCondition.GetType() == "GetArgumentAsBoolean");
-      REQUIRE(setterNoCondition.IsInverted());
-      REQUIRE(setterNoCondition.GetParametersCount() == 1);
-      REQUIRE(setterNoCondition.GetParameter(0).GetPlainString() ==
-              "\"Value\"");
+      REQUIRE(setterNoCondition.GetType() == "BooleanVariable");
+      REQUIRE(!setterNoCondition.IsInverted());
+      REQUIRE(setterNoCondition.GetParametersCount() == 3);
+      REQUIRE(setterNoCondition.GetParameter(0).GetPlainString() == "Value");
+      REQUIRE(setterNoCondition.GetParameter(1).GetPlainString() == "False");
+      REQUIRE(setterNoCondition.GetParameter(2).GetPlainString() == "");
 
       auto &setterNoAction = setterNoEvent.GetActions().at(0);
-      REQUIRE(setterNoAction.GetType() ==
-              "MyEventsExtension::MyEventsBasedObject::SetPropertyRotate");
-      REQUIRE(setterNoAction.GetParametersCount() == 2);
-      REQUIRE(setterNoAction.GetParameter(0).GetPlainString() == "Object");
-      REQUIRE(setterNoAction.GetParameter(1).GetPlainString() == "no");
+      REQUIRE(setterNoAction.GetType() == "SetBooleanVariable");
+      REQUIRE(setterNoAction.GetParametersCount() == 3);
+      REQUIRE(setterNoAction.GetParameter(0).GetPlainString() == "Rotate");
+      REQUIRE(setterNoAction.GetParameter(1).GetPlainString() == "False");
+      REQUIRE(setterNoAction.GetParameter(2).GetPlainString() == "");
 
       auto &setterYesEvent =
           dynamic_cast<gd::StandardEvent &>(setter.GetEvents().GetEvent(1));
@@ -519,18 +516,19 @@ TEST_CASE("PropertyFunctionGenerator", "[common]") {
       REQUIRE(setterYesEvent.GetActions().size() == 1);
 
       auto &setterYesCondition = setterYesEvent.GetConditions().at(0);
-      REQUIRE(setterYesCondition.GetType() == "GetArgumentAsBoolean");
+      REQUIRE(setterYesCondition.GetType() == "BooleanVariable");
       REQUIRE(!setterYesCondition.IsInverted());
-      REQUIRE(setterYesCondition.GetParametersCount() == 1);
-      REQUIRE(setterYesCondition.GetParameter(0).GetPlainString() ==
-              "\"Value\"");
+      REQUIRE(setterYesCondition.GetParametersCount() == 3);
+      REQUIRE(setterYesCondition.GetParameter(0).GetPlainString() == "Value");
+      REQUIRE(setterYesCondition.GetParameter(1).GetPlainString() == "True");
+      REQUIRE(setterYesCondition.GetParameter(2).GetPlainString() == "");
 
       auto &setterYesAction = setterYesEvent.GetActions().at(0);
-      REQUIRE(setterYesAction.GetType() ==
-              "MyEventsExtension::MyEventsBasedObject::SetPropertyRotate");
-      REQUIRE(setterYesAction.GetParametersCount() == 2);
-      REQUIRE(setterYesAction.GetParameter(0).GetPlainString() == "Object");
-      REQUIRE(setterYesAction.GetParameter(1).GetPlainString() == "yes");
+      REQUIRE(setterYesAction.GetType() == "SetBooleanVariable");
+      REQUIRE(setterYesAction.GetParametersCount() == 3);
+      REQUIRE(setterYesAction.GetParameter(0).GetPlainString() == "Rotate");
+      REQUIRE(setterYesAction.GetParameter(1).GetPlainString() == "True");
+      REQUIRE(setterYesAction.GetParameter(2).GetPlainString() == "");
     }
   }
 
@@ -588,9 +586,11 @@ TEST_CASE("PropertyFunctionGenerator", "[common]") {
       REQUIRE(setterEvent.GetConditions().size() == 0);
       REQUIRE(setterEvent.GetActions().size() == 1);
       auto &setterAction = setterEvent.GetActions().at(0);
-      REQUIRE(setterAction.GetType() ==
-              "MyEventsExtension::MyEventsBasedBehavior::"
-              "SetSharedPropertyMovementAngle");
+      REQUIRE(setterAction.GetType() == "SetNumberVariable");
+      REQUIRE(setterAction.GetParametersCount() == 3);
+      REQUIRE(setterAction.GetParameter(0).GetPlainString() == "MovementAngle");
+      REQUIRE(setterAction.GetParameter(1).GetPlainString() == "=");
+      REQUIRE(setterAction.GetParameter(2).GetPlainString() == "Value");
     }
   }
 

Core/tests/SourceFiles.cpp

@@ -1,30 +0,0 @@
-/*
- * GDevelop Core
- * Copyright 2008-2016 Florian Rival (Florian.Rival@gmail.com). All rights
- * reserved. This project is released under the MIT License.
- */
-/**
- * @file Tests covering common features of GDevelop Core.
- */
-#include "GDCore/CommonTools.h"
-#include "GDCore/Project/Project.h"
-#include "GDCore/Project/SourceFile.h"
-#include "catch.hpp"
-
-TEST_CASE("SourceFile", "[common]") {
-  SECTION("Basics") {
-    gd::Project project;
-    project.InsertNewSourceFile("test.cpp", "C++");
-    project.InsertNewSourceFile("test.js", "Javascript");
-    REQUIRE(project.HasSourceFile("test.cpp", "C++") == true);
-    REQUIRE(project.HasSourceFile("test.cpp", "JS") == false);
-    REQUIRE(project.HasSourceFile("test.cpp") == true);
-    gd::SourceFile& cppSourceFile = project.GetSourceFile("test.cpp");
-    REQUIRE(cppSourceFile.GetFileName() == "test.cpp");
-    REQUIRE(cppSourceFile.GetLanguage() == "C++");
-
-    project.RemoveSourceFile("test.cpp");
-    REQUIRE(project.HasSourceFile("test.cpp") == false);
-    REQUIRE(project.HasSourceFile("test.js") == true);
-  }
-}

Core/tests/WholeProjectRefactorer-ApplyRefactoringForVariablesContainer.cpp

@@ -19,7 +19,7 @@
 #include "GDCore/Extensions/Metadata/ParameterMetadataTools.h"
 #include "GDCore/Extensions/Platform.h"
 #include "GDCore/Extensions/PlatformExtension.h"
-#include "GDCore/IDE/GroupVariableHelper.h"
+#include "GDCore/IDE/ObjectVariableHelper.h"
 #include "GDCore/IDE/WholeProjectRefactorer.h"
 #include "GDCore/Project/Behavior.h"
 #include "GDCore/Project/EventsFunctionsExtension.h"
@@ -760,33 +760,33 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
 
     // Check the first layout is updated.
     {
-      REQUIRE(event.GetActions().GetCount() == 19);
+      REQUIRE(event.GetActions().GetCount() == 40);
 
       // clang-format off
-      // All the actions using the removed variables are gone.
-      REQUIRE(event.GetActions()[0].GetParameter(0).GetPlainString() == "1 + MySceneVariable2");
-      REQUIRE(event.GetActions()[1].GetParameter(0).GetPlainString() == "1 + Object2.MyObjectVariable");
-      REQUIRE(event.GetActions()[2].GetParameter(0).GetPlainString() == "1 + Object2.MyObjectStructureVariable.MyChild");
-      REQUIRE(event.GetActions()[3].GetParameter(0).GetPlainString() == "1 + MySceneStructureVariable2.MyChild");
-      REQUIRE(event.GetActions()[4].GetParameter(0).GetPlainString() == "1 + MyGlobalVariable2");
-      REQUIRE(event.GetActions()[5].GetParameter(0).GetPlainString() == "1 + MyGlobalStructureVariable2.MyChild");
-      REQUIRE(event.GetActions()[6].GetParameter(0).GetPlainString() == "1 + MyExtension::GetStringWith2ObjectParamAnd2ObjectVarParam(Object2, MyObjectVariable, Object2, MyObjectVariable)");
-      REQUIRE(event.GetActions()[7].GetParameter(0).GetPlainString() == "1 + MyExtension::GetStringWith2ObjectParamAnd2ObjectVarParam(Object2, MyObjectStructureVariable.MyChild, Object2, MyObjectStructureVariable.MyChild)");
-      REQUIRE(event.GetActions()[8].GetParameter(0).GetPlainString() == "1 + Object2.GetObjectVariableAsNumber(MyObjectVariable)");
-      REQUIRE(event.GetActions()[9].GetParameter(0).GetPlainString() == "1 + Object2.GetObjectVariableAsNumber(MyObjectStructureVariable.MyChild)");
-      REQUIRE(event.GetActions()[10].GetParameter(0).GetPlainString() == "1 + Object2.GetObjectVariableAsNumber(MyObjectStructureVariable.MyChild.GrandChild)");
-      REQUIRE(event.GetActions()[11].GetParameter(0).GetPlainString() == "1 + MyExtension::GetGlobalVariableAsNumber(MyGlobalVariable2)");
-      REQUIRE(event.GetActions()[12].GetParameter(0).GetPlainString() == "1 + MyExtension::GetVariableAsNumber(MySceneVariable2)");
-      REQUIRE(event.GetActions()[13].GetParameter(0).GetPlainString() == "1 + MyExtension::GetVariableAsNumber(SharedVariableName)");
-      REQUIRE(event.GetActions()[14].GetParameter(0).GetPlainString() == "1 + MyExtension::GetGlobalVariableAsNumber(MyGlobalStructureVariable2.MyChild)");
-      REQUIRE(event.GetActions()[15].GetParameter(0).GetPlainString() == "1 + MyExtension::GetVariableAsNumber(MySceneStructureVariable2.MyChild)");
-      REQUIRE(event.GetActions()[16].GetParameter(0).GetPlainString() == "1 + MyExtension::GetGlobalVariableAsNumber(MyGlobalStructureVariable2.MyChild.GrandChild)");
-      REQUIRE(event.GetActions()[17].GetParameter(0).GetPlainString() == "1 + MyExtension::GetVariableAsNumber(MySceneStructureVariable2.MyChild.GrandChild)");
+      // All the actions using the removed variables are kept.
+      REQUIRE(event.GetActions()[1].GetParameter(0).GetPlainString() == "1 + MySceneVariable2");
+      REQUIRE(event.GetActions()[3].GetParameter(0).GetPlainString() == "1 + Object2.MyObjectVariable");
+      REQUIRE(event.GetActions()[5].GetParameter(0).GetPlainString() == "1 + Object2.MyObjectStructureVariable.MyChild");
+      REQUIRE(event.GetActions()[7].GetParameter(0).GetPlainString() == "1 + MySceneStructureVariable2.MyChild");
+      REQUIRE(event.GetActions()[9].GetParameter(0).GetPlainString() == "1 + MyGlobalVariable2");
+      REQUIRE(event.GetActions()[11].GetParameter(0).GetPlainString() == "1 + MyGlobalStructureVariable2.MyChild");
+      REQUIRE(event.GetActions()[13].GetParameter(0).GetPlainString() == "1 + MyExtension::GetStringWith2ObjectParamAnd2ObjectVarParam(Object2, MyObjectVariable, Object2, MyObjectVariable)");
+      REQUIRE(event.GetActions()[15].GetParameter(0).GetPlainString() == "1 + MyExtension::GetStringWith2ObjectParamAnd2ObjectVarParam(Object2, MyObjectStructureVariable.MyChild, Object2, MyObjectStructureVariable.MyChild)");
+      REQUIRE(event.GetActions()[17].GetParameter(0).GetPlainString() == "1 + Object2.GetObjectVariableAsNumber(MyObjectVariable)");
+      REQUIRE(event.GetActions()[19].GetParameter(0).GetPlainString() == "1 + Object2.GetObjectVariableAsNumber(MyObjectStructureVariable.MyChild)");
+      REQUIRE(event.GetActions()[21].GetParameter(0).GetPlainString() == "1 + Object2.GetObjectVariableAsNumber(MyObjectStructureVariable.MyChild.GrandChild)");
+      REQUIRE(event.GetActions()[23].GetParameter(0).GetPlainString() == "1 + MyExtension::GetGlobalVariableAsNumber(MyGlobalVariable2)");
+      REQUIRE(event.GetActions()[26].GetParameter(0).GetPlainString() == "1 + MyExtension::GetVariableAsNumber(MySceneVariable2)");
+      REQUIRE(event.GetActions()[27].GetParameter(0).GetPlainString() == "1 + MyExtension::GetVariableAsNumber(SharedVariableName)");
+      REQUIRE(event.GetActions()[29].GetParameter(0).GetPlainString() == "1 + MyExtension::GetGlobalVariableAsNumber(MyGlobalStructureVariable2.MyChild)");
+      REQUIRE(event.GetActions()[31].GetParameter(0).GetPlainString() == "1 + MyExtension::GetVariableAsNumber(MySceneStructureVariable2.MyChild)");
+      REQUIRE(event.GetActions()[33].GetParameter(0).GetPlainString() == "1 + MyExtension::GetGlobalVariableAsNumber(MyGlobalStructureVariable2.MyChild.GrandChild)");
+      REQUIRE(event.GetActions()[35].GetParameter(0).GetPlainString() == "1 + MyExtension::GetVariableAsNumber(MySceneStructureVariable2.MyChild.GrandChild)");
 
-      REQUIRE(event.GetActions()[18].GetParameter(0).GetPlainString() == "MySceneVariable2");
-      REQUIRE(event.GetActions()[18].GetParameter(1).GetPlainString() == "MyGlobalVariable2");
-      REQUIRE(event.GetActions()[18].GetParameter(2).GetPlainString() == "Object2");
-      REQUIRE(event.GetActions()[18].GetParameter(3).GetPlainString() == "MyObjectVariable");
+      REQUIRE(event.GetActions()[39].GetParameter(0).GetPlainString() == "MySceneVariable2");
+      REQUIRE(event.GetActions()[39].GetParameter(1).GetPlainString() == "MyGlobalVariable2");
+      REQUIRE(event.GetActions()[39].GetParameter(2).GetPlainString() == "Object2");
+      REQUIRE(event.GetActions()[39].GetParameter(3).GetPlainString() == "MyObjectVariable");
       // clang-format on
     }
 
@@ -1021,6 +1021,140 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
             "MyVariable.MyRenamedChild");
   }
 
+  SECTION("Can rename an object variable") {
+    gd::Project project;
+    gd::Platform platform;
+    SetupProjectWithDummyPlatform(project, platform);
+
+    auto &scene = project.InsertNewLayout("Scene", 0);
+    auto &object = scene.GetObjects().InsertNewObject(
+        project, "MyExtension::Sprite", "Object", 0);
+    object.GetVariables().InsertNew("MyVariable").SetValue(123);
+    auto &instance = scene.GetInitialInstances().InsertNewInitialInstance();
+    instance.SetObjectName("Object");
+    instance.GetVariables().InsertNew("MyVariable").SetValue(456);
+
+    gd::StandardEvent &event =
+        dynamic_cast<gd::StandardEvent &>(scene.GetEvents().InsertNewEvent(
+            project, "BuiltinCommonInstructions::Standard"));
+
+    {
+      gd::Instruction action;
+      action.SetType("SetNumberObjectVariable");
+      action.SetParametersCount(4);
+      action.SetParameter(0, gd::Expression("Object"));
+      action.SetParameter(1, gd::Expression("MyVariable"));
+      action.SetParameter(2, gd::Expression("="));
+      action.SetParameter(3, gd::Expression("Object.MyVariable"));
+      event.GetActions().Insert(action);
+    }
+
+    // Do the changes and launch the refactoring.
+    object.GetVariables().ResetPersistentUuid();
+    gd::SerializerElement originalSerializedVariables;
+    object.GetVariables().SerializeTo(originalSerializedVariables);
+
+    object.GetVariables().Rename("MyVariable", "MyRenamedVariable");
+    auto changeset =
+        gd::WholeProjectRefactorer::ComputeChangesetForVariablesContainer(
+            originalSerializedVariables, object.GetVariables());
+
+    REQUIRE(changeset.oldToNewVariableNames.size() == 1);
+
+    gd::WholeProjectRefactorer::ApplyRefactoringForObjectVariablesContainer(
+        project, object.GetVariables(), scene.GetInitialInstances(),
+        object.GetName(), changeset, originalSerializedVariables);
+
+    REQUIRE(event.GetActions()[0].GetParameter(1).GetPlainString() ==
+            "MyRenamedVariable");
+    REQUIRE(event.GetActions()[0].GetParameter(3).GetPlainString() ==
+            "Object.MyRenamedVariable");
+    REQUIRE(instance.GetVariables().Get("MyRenamedVariable").GetValue() == 456);
+  }
+
+  SECTION("Can delete an object variable") {
+    gd::Project project;
+    gd::Platform platform;
+    SetupProjectWithDummyPlatform(project, platform);
+
+    auto &scene = project.InsertNewLayout("Scene", 0);
+    auto &object = scene.GetObjects().InsertNewObject(
+        project, "MyExtension::Sprite", "Object", 0);
+    object.GetVariables().InsertNew("MyVariable").SetValue(123);
+    auto &instance = scene.GetInitialInstances().InsertNewInitialInstance();
+    instance.SetObjectName("Object");
+    instance.GetVariables().InsertNew("MyVariable").SetValue(456);
+
+    gd::StandardEvent &event =
+        dynamic_cast<gd::StandardEvent &>(scene.GetEvents().InsertNewEvent(
+            project, "BuiltinCommonInstructions::Standard"));
+
+    {
+      gd::Instruction action;
+      action.SetType("SetNumberObjectVariable");
+      action.SetParametersCount(4);
+      action.SetParameter(0, gd::Expression("Object"));
+      action.SetParameter(1, gd::Expression("MyVariable"));
+      action.SetParameter(2, gd::Expression("="));
+      action.SetParameter(3, gd::Expression("Object.MyVariable"));
+      event.GetActions().Insert(action);
+    }
+
+    // Do the changes and launch the refactoring.
+    object.GetVariables().ResetPersistentUuid();
+    gd::SerializerElement originalSerializedVariables;
+    object.GetVariables().SerializeTo(originalSerializedVariables);
+
+    object.GetVariables().Remove("MyVariable");
+    auto changeset =
+        gd::WholeProjectRefactorer::ComputeChangesetForVariablesContainer(
+            originalSerializedVariables, object.GetVariables());
+    REQUIRE(changeset.removedVariableNames.size() == 1);
+    gd::WholeProjectRefactorer::ApplyRefactoringForObjectVariablesContainer(
+        project, object.GetVariables(), scene.GetInitialInstances(),
+        object.GetName(), changeset, originalSerializedVariables);
+
+    // Events are untouched
+    REQUIRE(scene.GetEvents().size() == 1);
+    REQUIRE(event.GetActions().size() == 1);
+    REQUIRE(event.GetActions()[0].GetParameter(1).GetPlainString() ==
+            "MyVariable");
+    REQUIRE(event.GetActions()[0].GetParameter(3).GetPlainString() ==
+            "Object.MyVariable");
+    // Instance variables are removed
+    REQUIRE(!instance.GetVariables().Has("MyVariable"));
+  }
+
+  SECTION("Can add an object variable") {
+    gd::Project project;
+    gd::Platform platform;
+    SetupProjectWithDummyPlatform(project, platform);
+
+    auto &scene = project.InsertNewLayout("Scene", 0);
+    auto &object = scene.GetObjects().InsertNewObject(
+        project, "MyExtension::Sprite", "Object", 0);
+    auto &instance = scene.GetInitialInstances().InsertNewInitialInstance();
+    instance.SetObjectName("Object");
+
+    // Do the changes and launch the refactoring.
+    object.GetVariables().ResetPersistentUuid();
+    gd::SerializerElement originalSerializedVariables;
+    object.GetVariables().SerializeTo(originalSerializedVariables);
+
+    object.GetVariables().InsertNew("MyVariable").SetValue(123);
+    auto changeset =
+        gd::WholeProjectRefactorer::ComputeChangesetForVariablesContainer(
+            originalSerializedVariables, object.GetVariables());
+
+    REQUIRE(changeset.addedVariableNames.size() == 1);
+
+    gd::WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
+        project, object.GetVariables(), changeset, originalSerializedVariables);
+
+    // Instance variables are NOT added
+    REQUIRE(!instance.GetVariables().Has("MyVariable"));
+  }
+
   SECTION("Can rename an object child variable") {
     gd::Project project;
     gd::Platform platform;
@@ -1062,8 +1196,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
 
     REQUIRE(changeset.modifiedVariables.size() == 1);
 
-    gd::WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
-        project, object.GetVariables(), changeset, originalSerializedVariables);
+    gd::WholeProjectRefactorer::ApplyRefactoringForObjectVariablesContainer(
+        project, object.GetVariables(), scene.GetInitialInstances(),
+        object.GetName(), changeset, originalSerializedVariables);
 
     REQUIRE(event.GetActions()[0].GetParameter(1).GetPlainString() ==
             "MyVariable.MyRenamedChild");
@@ -1112,8 +1247,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
 
     REQUIRE(changeset.modifiedVariables.size() == 1);
 
-    gd::WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
-        project, object.GetVariables(), changeset, originalSerializedVariables);
+    gd::WholeProjectRefactorer::ApplyRefactoringForObjectVariablesContainer(
+        project, object.GetVariables(), scene.GetInitialInstances(),
+        object.GetName(), changeset, originalSerializedVariables);
 
     REQUIRE(event.GetActions()[0].GetParameter(3).GetPlainString() ==
             "MyVariable.MyRenamedChild");
@@ -1161,8 +1297,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
 
     REQUIRE(changeset.modifiedVariables.size() == 1);
 
-    gd::WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
-        project, object.GetVariables(), changeset, originalSerializedVariables);
+    gd::WholeProjectRefactorer::ApplyRefactoringForObjectVariablesContainer(
+        project, object.GetVariables(), scene.GetInitialInstances(),
+        object.GetName(), changeset, originalSerializedVariables);
 
     REQUIRE(event.GetActions()[0].GetParameter(3).GetPlainString() ==
             "MyVariable.MyChild.MyRenamedGrandChild");
@@ -1540,7 +1677,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
   auto projectScopedContainers =
     gd::ProjectScopedContainers::MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     REQUIRE(&projectScopedContainers.GetVariablesContainersList()
-                   .GetVariablesContainerFromVariableName("MyVariable") == &scene.GetVariables());
+                   .GetVariablesContainerFromVariableOrPropertyOrParameterName("MyVariable") == &scene.GetVariables());
 
     // Do the changes and launch the refactoring.
     scene.GetVariables().ResetPersistentUuid();
@@ -1722,7 +1859,8 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto &extension = project.InsertNewEventsFunctionsExtension("Extension", 0);
     extension.GetSceneVariables().InsertNew("MySceneVariable").SetValue(123);
 
-    auto &function = extension.InsertNewEventsFunction("MyFunction", 0);
+    auto &function =
+        extension.GetEventsFunctions().InsertNewEventsFunction("MyFunction", 0);
     gd::StandardEvent &event =
         dynamic_cast<gd::StandardEvent &>(function.GetEvents().InsertNewEvent(
             project, "BuiltinCommonInstructions::Standard"));
@@ -1895,8 +2033,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.typeChangedVariableNames.find("MyObjectVariable") !=
             changeset.typeChangedVariableNames.end());
 
-    gd::WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
-        project, object.GetVariables(), changeset, originalSerializedVariables);
+    gd::WholeProjectRefactorer::ApplyRefactoringForObjectVariablesContainer(
+        project, object.GetVariables(), scene.GetInitialInstances(),
+        object.GetName(), changeset, originalSerializedVariables);
 
     // Check the the action has changed to follow the variable type.
     REQUIRE(event.GetActions()[0].GetType() == "SetStringObjectVariable");
@@ -1946,8 +2085,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.typeChangedVariableNames.find("MyObjectVariable") !=
             changeset.typeChangedVariableNames.end());
 
-    gd::WholeProjectRefactorer::ApplyRefactoringForVariablesContainer(
-        project, object.GetVariables(), changeset, originalSerializedVariables);
+    gd::WholeProjectRefactorer::ApplyRefactoringForObjectVariablesContainer(
+        project, object.GetVariables(), scene.GetInitialInstances(),
+        object.GetName(), changeset, originalSerializedVariables);
 
     // Check the the action has changed to follow the variable type.
     REQUIRE(event.GetActions()[0].GetType() == "SetStringObjectVariable");
@@ -1976,7 +2116,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
     
     REQUIRE(groupVariables.Count() == 1);
@@ -2008,7 +2148,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
     
     REQUIRE(groupVariables.Count() == 1);
@@ -2028,7 +2168,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
     
     REQUIRE(groupVariables.Count() == 0);
@@ -2049,7 +2189,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
     
     REQUIRE(groupVariables.Count() == 0);
@@ -2074,7 +2214,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2093,8 +2233,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.valueChangedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables().Get("MyGroupVariable").GetValue() == 456);
     REQUIRE(otherObject.GetVariables().Get("MyGroupVariable").GetValue() ==
@@ -2120,7 +2261,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
     
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2139,8 +2280,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.valueChangedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables().Get("MyGroupVariable").GetValue() == 456);
     REQUIRE(otherObject.GetVariables().Get("MyGroupVariable").GetValue() ==
@@ -2166,7 +2308,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
     
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2187,8 +2329,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.valueChangedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables().Get("MyGroupVariable").GetValue() == 111);
     REQUIRE(otherObject.GetVariables().Get("MyGroupVariable").GetValue() ==
@@ -2214,7 +2357,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
     
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2235,8 +2378,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.valueChangedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables().Get("MyGroupVariable").GetValue() == 0);
     REQUIRE(otherObject.GetVariables().Get("MyGroupVariable").GetValue() ==
@@ -2262,7 +2406,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2281,8 +2425,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.valueChangedVariableNames.size() == 0);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables().Get("MyGroupVariable").GetValue() == 111);
     REQUIRE(otherObject.GetVariables().Get("MyGroupVariable").GetValue() ==
@@ -2317,7 +2462,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Count() == 1);
@@ -2335,8 +2480,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
             originalSerializedVariables, groupVariables);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(newObject.GetVariables().Count() == 2);
     REQUIRE(newObject.GetVariables().Get("MyGroupVariable").GetValue() == 123);
@@ -2368,7 +2514,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2389,8 +2535,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.valueChangedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables()
                 .Get("MyGroupVariable")
@@ -2427,7 +2574,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2447,8 +2594,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.valueChangedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables()
                 .Get("MyGroupVariable")
@@ -2485,7 +2633,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2505,8 +2653,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.valueChangedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables()
                 .Get("MyGroupVariable")
@@ -2557,7 +2706,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2578,8 +2727,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.valueChangedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables()
                 .Get("MyGroupVariable")
@@ -2612,11 +2762,14 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto &group = scene.GetObjects().GetObjectGroups().InsertNew("Group");
     group.AddObject("Object");
     group.AddObject("OtherObject");
+    auto &instance = scene.GetInitialInstances().InsertNewInitialInstance();
+    instance.SetObjectName("Object");
+    instance.GetVariables().InsertNew("MyGroupVariable").SetValue(456);
 
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2634,11 +2787,13 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.removedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(!object.GetVariables().Has("MyGroupVariable"));
     REQUIRE(!otherObject.GetVariables().Has("MyGroupVariable"));
+    REQUIRE(!instance.GetVariables().Has("MyGroupVariable"));
   }
 
   SECTION("Can add a group variable") {
@@ -2658,7 +2813,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Count() == 0);
@@ -2676,8 +2831,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.addedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables().Get("MyGroupVariable").GetValue() == 456);
     REQUIRE(otherObject.GetVariables().Get("MyGroupVariable").GetValue() ==
@@ -2703,7 +2859,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Count() == 0);
@@ -2721,8 +2877,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.addedVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     // The variable kept its original value.
     REQUIRE(object.GetVariables().Count() == 1);
@@ -2748,6 +2905,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto &group = scene.GetObjects().GetObjectGroups().InsertNew("Group");
     group.AddObject("Object");
     group.AddObject("OtherObject");
+    auto &instance = scene.GetInitialInstances().InsertNewInitialInstance();
+    instance.SetObjectName("Object");
+    instance.GetVariables().InsertNew("MyGroupVariable").SetValue(456);
 
     gd::StandardEvent &event =
         dynamic_cast<gd::StandardEvent &>(scene.GetEvents().InsertNewEvent(
@@ -2786,7 +2946,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2805,8 +2965,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.oldToNewVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(object.GetVariables().Count() == 1);
     REQUIRE(object.GetVariables().Get("MyRenamedGroupVariable").GetValue() == 123);
@@ -2829,6 +2990,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
             "MyRenamedGroupVariable");
     REQUIRE(event.GetActions()[2].GetParameter(3).GetPlainString() ==
             "OtherObject.MyRenamedGroupVariable");
+    REQUIRE(instance.GetVariables().Get("MyRenamedGroupVariable").GetValue() == 456);
   }
 
   SECTION("Can rename a group variable when one of the object already has it") {
@@ -2886,7 +3048,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -2905,8 +3067,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.oldToNewVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
         
     // The variable kept its original value.
     REQUIRE(object.GetVariables().Count() == 1);
@@ -2991,7 +3154,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -3015,8 +3178,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.modifiedVariables.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(event.GetActions()[0].GetParameter(1).GetPlainString() ==
             "MyGroupVariable.MyRenamedChild");
@@ -3066,7 +3230,7 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     auto projectScopedContainers = gd::ProjectScopedContainers::
         MakeNewProjectScopedContainersForProjectAndLayout(project, scene);
     gd::VariablesContainer groupVariables =
-        gd::GroupVariableHelper::MergeVariableContainers(
+        gd::ObjectVariableHelper::MergeVariableContainers(
             projectScopedContainers.GetObjectsContainersList(), group);
 
     REQUIRE(groupVariables.Has("MyGroupVariable"));
@@ -3085,8 +3249,9 @@ TEST_CASE("WholeProjectRefactorer::ApplyRefactoringForVariablesContainer",
     REQUIRE(changeset.oldToNewVariableNames.size() == 1);
 
     gd::WholeProjectRefactorer::ApplyRefactoringForGroupVariablesContainer(
-        project, project.GetObjects(), scene.GetObjects(), groupVariables,
-        group, changeset, originalSerializedVariables);
+        project, project.GetObjects(), scene.GetObjects(),
+        scene.GetInitialInstances(), groupVariables, group, changeset,
+        originalSerializedVariables);
 
     REQUIRE(event.GetActions()[0].GetParameter(1).GetPlainString() ==
             "MyGroupVariable");