Fix regression: slow opening of very large games

See remaining items here: https://github.com/4ian/GDevelop/pull/951#issuecomment-483974639

.github/ISSUE_TEMPLATE/--feature-request.md

@@ -1,7 +1,7 @@
 ---
 name: "\U0001F4A1Feature request"
 about: Suggest an idea for this project AFTER discussing about it on the Discord or
-  Forum first.
+  Forum first. We'll create a card for it on the roadmap.
 
 ---
 
@@ -10,6 +10,8 @@ BEFORE opening a new feature request, please make sure that you:
  * There is not already a suggestion about it in the issues or in the roadmap: https://trello.com/b/qf0lM7k8/gdevelop-roadmap
  * Consider commenting on the roadmap if something is important for you
 
+AFTER opening the feature request, the issue will be closed by a maintainer (@4ian or someone else) and a card will be added in the roadmap if it's relevant and does not exist yet :)
+
 ## Description
 Is your feature request **related to a problem**? Please describe.
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]

.gitignore

@@ -9,6 +9,7 @@
 /ExtLibs/*.7z
 /scripts/Repository keys
 /scripts/logs/*.txt
+/scripts/gdcore-gdcpp-gdjs-extensions-messages.pot
 /Binaries/.build*
 /Binaries/.embuild*
 /Binaries/build*

.travis.yml

@@ -69,6 +69,7 @@ script:
   - cd newIDE/app
   - npm test
   - npm run flow
+  - npm run check-format
   - cd ../..
 #GDJS game engine tests, disabled on Travis CI because ChromeHeadless can't be started.
 #See them running on Semaphore-CI instead: https://semaphoreci.com/4ian/gd

.vscode/settings.json

@@ -77,7 +77,9 @@
         "cstdint": "cpp",
         "forward_list": "cpp",
         "mutex": "cpp",
-        "__hash": "cpp"
+        "__hash": "cpp",
+        "__debug": "cpp",
+        "__threading_support": "cpp"
     },
     "files.exclude": {
         "Binaries/*build*": true,
@@ -97,6 +99,7 @@
     // Support for Flowtype:
     "javascript.validate.enable": false,
     "flow.useNPMPackagedFlow": true,
+    "flow.useLSP": false, // As we are in a monorepo, see https://github.com/flowtype/flow-for-vscode/issues/301
 
     // Clang format styling (duplicated in scripts/CMakeClangUtils.txt)
     "C_Cpp.clang_format_style": "{BasedOnStyle: Google, BinPackParameters: false, BinPackArguments: false}"

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Binaries/Output/Release_Windows/JsPlatform/Extensions/tween_behavior.svg

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Core/GDCore.cbp

@@ -370,8 +370,8 @@
 		<Unit filename="GDCore/IDE/Events/ExpressionsCorrectnessTesting.h" />
 		<Unit filename="GDCore/IDE/ExtensionsLoader.cpp" />
 		<Unit filename="GDCore/IDE/ExtensionsLoader.h" />
-		<Unit filename="GDCore/IDE/Project/ImagesUsedInventorizer.cpp" />
-		<Unit filename="GDCore/IDE/Project/ImagesUsedInventorizer.h" />
+		<Unit filename="GDCore/IDE/Project/ResourcesInUseHelper.cpp" />
+		<Unit filename="GDCore/IDE/Project/ResourcesInUseHelper.h" />
 		<Unit filename="GDCore/Extensions/Metadata/MetadataProvider.cpp" />
 		<Unit filename="GDCore/Extensions/Metadata/MetadataProvider.h" />
 		<Unit filename="GDCore/IDE/PlatformLoader.cpp" />

Core/GDCore/Events/CodeGeneration/EventsCodeGenerator.cpp

@@ -3,6 +3,7 @@
 #include <utility>
 #include "GDCore/CommonTools.h"
 #include "GDCore/Events/CodeGeneration/EventsCodeGenerationContext.h"
+#include "GDCore/Events/CodeGeneration/ExpressionCodeGenerator.h"
 #include "GDCore/Events/CodeGeneration/ExpressionsCodeGeneration.h"
 #include "GDCore/Events/Parsers/ExpressionParser.h"
 #include "GDCore/Events/Tools/EventsCodeNameMangler.h"
@@ -10,11 +11,12 @@
 #include "GDCore/Extensions/Metadata/InstructionMetadata.h"
 #include "GDCore/Extensions/Metadata/MetadataProvider.h"
 #include "GDCore/Extensions/Metadata/ObjectMetadata.h"
+#include "GDCore/Extensions/Metadata/ParameterMetadataTools.h"
 #include "GDCore/Extensions/Platform.h"
 #include "GDCore/Extensions/PlatformExtension.h"
 #include "GDCore/Project/Layout.h"
-#include "GDCore/Project/Project.h"
 #include "GDCore/Project/ObjectsContainer.h"
+#include "GDCore/Project/Project.h"
 
 using namespace std;
 
@@ -295,11 +297,14 @@ gd::String EventsCodeGenerator::GenerateConditionCode(
       if (!GetObjectsAndGroups().HasObjectNamed(objectInParameter) &&
           !GetGlobalObjectsAndGroups().HasObjectNamed(objectInParameter) &&
           !GetObjectsAndGroups().GetObjectGroups().Has(objectInParameter) &&
-          !GetGlobalObjectsAndGroups().GetObjectGroups().Has(objectInParameter)) {
+          !GetGlobalObjectsAndGroups().GetObjectGroups().Has(
+              objectInParameter)) {
         condition.SetParameter(pNb, gd::Expression(""));
         condition.SetType("");
       } else if (!instrInfos.parameters[pNb].supplementaryInformation.empty() &&
-                 gd::GetTypeOfObject(GetGlobalObjectsAndGroups(), GetObjectsAndGroups(), objectInParameter) !=
+                 gd::GetTypeOfObject(GetGlobalObjectsAndGroups(),
+                                     GetObjectsAndGroups(),
+                                     objectInParameter) !=
                      instrInfos.parameters[pNb].supplementaryInformation) {
         condition.SetParameter(pNb, gd::Expression(""));
         condition.SetType("");
@@ -328,7 +333,8 @@ gd::String EventsCodeGenerator::GenerateConditionCode(
   gd::String objectName = condition.GetParameters().empty()
                               ? ""
                               : condition.GetParameter(0).GetPlainString();
-  gd::String objectType = gd::GetTypeOfObject(GetGlobalObjectsAndGroups(), GetObjectsAndGroups(), objectName);
+  gd::String objectType = gd::GetTypeOfObject(
+      GetGlobalObjectsAndGroups(), GetObjectsAndGroups(), objectName);
   if (!objectName.empty() &&
       MetadataProvider::HasObjectCondition(
           platform, objectType, condition.GetType()) &&
@@ -473,11 +479,14 @@ gd::String EventsCodeGenerator::GenerateActionCode(
       if (!GetObjectsAndGroups().HasObjectNamed(objectInParameter) &&
           !GetGlobalObjectsAndGroups().HasObjectNamed(objectInParameter) &&
           !GetObjectsAndGroups().GetObjectGroups().Has(objectInParameter) &&
-          !GetGlobalObjectsAndGroups().GetObjectGroups().Has(objectInParameter)) {
+          !GetGlobalObjectsAndGroups().GetObjectGroups().Has(
+              objectInParameter)) {
         action.SetParameter(pNb, gd::Expression(""));
         action.SetType("");
       } else if (!instrInfos.parameters[pNb].supplementaryInformation.empty() &&
-                 gd::GetTypeOfObject(GetGlobalObjectsAndGroups(), GetObjectsAndGroups(), objectInParameter) !=
+                 gd::GetTypeOfObject(GetGlobalObjectsAndGroups(),
+                                     GetObjectsAndGroups(),
+                                     objectInParameter) !=
                      instrInfos.parameters[pNb].supplementaryInformation) {
         action.SetParameter(pNb, gd::Expression(""));
         action.SetType("");
@@ -496,7 +505,8 @@ gd::String EventsCodeGenerator::GenerateActionCode(
   gd::String objectName = action.GetParameters().empty()
                               ? ""
                               : action.GetParameter(0).GetPlainString();
-  gd::String objectType = gd::GetTypeOfObject(GetGlobalObjectsAndGroups(), GetObjectsAndGroups(), objectName);
+  gd::String objectType = gd::GetTypeOfObject(
+      GetGlobalObjectsAndGroups(), GetObjectsAndGroups(), objectName);
   if (MetadataProvider::HasObjectAction(
           platform, objectType, action.GetType()) &&
       !instrInfos.parameters.empty()) {
@@ -582,34 +592,24 @@ gd::String EventsCodeGenerator::GenerateParameterCodes(
     const gd::String& parameter,
     const gd::ParameterMetadata& metadata,
     gd::EventsCodeGenerationContext& context,
-    const gd::String& previousParameter,
+    const gd::String& lastObjectName,
     std::vector<std::pair<gd::String, gd::String> >*
         supplementaryParametersTypes) {
   gd::String argOutput;
 
   if (ParameterMetadata::IsExpression("number", metadata.type)) {
-    CallbacksForGeneratingExpressionCode callbacks(argOutput, *this, context);
-
-    gd::ExpressionParser parser(parameter);
-    if (!parser.ParseMathExpression(platform, GetGlobalObjectsAndGroups(), GetObjectsAndGroups(), callbacks)) {
-      cout << "Error :" << parser.GetFirstError() << " in: " << parameter
-           << endl;
-
-      argOutput = "0";
-    }
-
-    if (argOutput.empty()) argOutput = "0";
+    argOutput = gd::ExpressionCodeGenerator::GenerateExpressionCode(
+        *this, context, "number", parameter);
   } else if (ParameterMetadata::IsExpression("string", metadata.type)) {
-    CallbacksForGeneratingExpressionCode callbacks(argOutput, *this, context);
-
-    gd::ExpressionParser parser(parameter);
-    if (!parser.ParseStringExpression(platform, GetGlobalObjectsAndGroups(), GetObjectsAndGroups(), callbacks)) {
-      cout << "Error in text expression" << parser.GetFirstError() << endl;
-
-      argOutput = "\"\"";
-    }
-
-    if (argOutput.empty()) argOutput = "\"\"";
+    argOutput = gd::ExpressionCodeGenerator::GenerateExpressionCode(
+        *this, context, "string", parameter);
+  } else if (ParameterMetadata::IsExpression("variable", metadata.type)) {
+    argOutput = gd::ExpressionCodeGenerator::GenerateExpressionCode(
+        *this, context, metadata.type, parameter, lastObjectName);
+  } else if (ParameterMetadata::IsObject(metadata.type)) {
+    // It would be possible to run a gd::ExpressionCodeGenerator if later
+    // objects can have nested objects, or function returning objects.
+    argOutput = GenerateObject(parameter, metadata.type, context);
   } else if (metadata.type == "relationalOperator") {
     argOutput += parameter == "=" ? "==" : parameter;
     if (argOutput != "==" && argOutput != "<" && argOutput != ">" &&
@@ -628,14 +628,12 @@ gd::String EventsCodeGenerator::GenerateParameterCodes(
     }
 
     argOutput = "\"" + argOutput + "\"";
-  } else if (metadata.type == "object" || metadata.type == "behavior") {
+  } else if (ParameterMetadata::IsBehavior(metadata.type)) {
     argOutput = "\"" + ConvertToString(parameter) + "\"";
   } else if (metadata.type == "key") {
     argOutput = "\"" + ConvertToString(parameter) + "\"";
-  } else if (metadata.type == "objectvar" || metadata.type == "scenevar" ||
-             metadata.type == "globalvar" || metadata.type == "password" ||
-             metadata.type == "musicfile" || metadata.type == "soundfile" ||
-             metadata.type == "police") {
+  } else if (metadata.type == "password" || metadata.type == "musicfile" ||
+             metadata.type == "soundfile" || metadata.type == "police") {
     argOutput = "\"" + ConvertToString(parameter) + "\"";
   } else if (metadata.type == "mouse") {
     argOutput = "\"" + ConvertToString(parameter) + "\"";
@@ -643,6 +641,7 @@ gd::String EventsCodeGenerator::GenerateParameterCodes(
     argOutput += (parameter == "yes" || parameter == "oui") ? GenerateTrue()
                                                             : GenerateFalse();
   } else if (metadata.type == "trueorfalse") {
+    // This is duplicated in AdvancedExtension.cpp for GDJS
     argOutput += (parameter == "True" || parameter == "Vrai") ? GenerateTrue()
                                                               : GenerateFalse();
   }
@@ -671,32 +670,28 @@ gd::String EventsCodeGenerator::GenerateParameterCodes(
 }
 
 vector<gd::String> EventsCodeGenerator::GenerateParametersCodes(
-    vector<gd::Expression> parameters,
+    const vector<gd::Expression>& parameters,
     const vector<gd::ParameterMetadata>& parametersInfo,
     EventsCodeGenerationContext& context,
     std::vector<std::pair<gd::String, gd::String> >*
         supplementaryParametersTypes) {
   vector<gd::String> arguments;
 
-  while (parameters.size() < parametersInfo.size())
-    parameters.push_back(gd::Expression(""));
-
-  for (std::size_t pNb = 0;
-       pNb < parametersInfo.size() && pNb < parameters.size();
-       ++pNb) {
-    if (parameters[pNb].GetPlainString().empty() &&
-        parametersInfo[pNb].optional)
-      parameters[pNb] = gd::Expression(parametersInfo[pNb].defaultValue);
-
-    gd::String argOutput = GenerateParameterCodes(
-        parameters[pNb].GetPlainString(),
-        parametersInfo[pNb],
-        context,
-        pNb == 0 ? "" : parameters[pNb - 1].GetPlainString(),
-        supplementaryParametersTypes);
-
-    arguments.push_back(argOutput);
-  }
+  gd::ParameterMetadataTools::IterateOverParameters(
+      parameters,
+      parametersInfo,
+      [this, &context, &supplementaryParametersTypes, &arguments](
+          const gd::ParameterMetadata& parameterMetadata,
+          const gd::String& parameterValue,
+          const gd::String& lastObjectName) {
+        gd::String argOutput =
+            GenerateParameterCodes(parameterValue,
+                                   parameterMetadata,
+                                   context,
+                                   lastObjectName,
+                                   supplementaryParametersTypes);
+        arguments.push_back(argOutput);
+      });
 
   return arguments;
 }
@@ -798,23 +793,10 @@ gd::String EventsCodeGenerator::GenerateEventsListCode(
 }
 
 gd::String EventsCodeGenerator::ConvertToString(gd::String plainString) {
-  for (size_t i = 0; i < plainString.length(); ++i) {
-    if (plainString[i] == '\\') {
-      if (i + 1 >= plainString.length() || plainString[i + 1] != '\"') {
-        if (i + 1 < plainString.length())
-          plainString.insert(i + 1, "\\");
-        else
-          plainString += ("\\");
-
-        ++i;
-      }
-    } else if (plainString[i] == '"') {
-      plainString.insert(i, "\\");
-      ++i;
-    }
-  }
-
-  plainString = plainString.FindAndReplace("\n", "\\n");
+  plainString = plainString.FindAndReplace("\\", "\\\\")
+                    .FindAndReplace("\r", "\\r")
+                    .FindAndReplace("\n", "\\n")
+                    .FindAndReplace("\"", "\\\"");
 
   return plainString;
 }
@@ -830,10 +812,12 @@ std::vector<gd::String> EventsCodeGenerator::ExpandObjectsName(
   // Note: this logic is duplicated in EventsContextAnalyzer::ExpandObjectsName
   std::vector<gd::String> realObjects;
   if (globalObjectsAndGroups.GetObjectGroups().Has(objectName))
-    realObjects =
-        globalObjectsAndGroups.GetObjectGroups().Get(objectName).GetAllObjectsNames();
+    realObjects = globalObjectsAndGroups.GetObjectGroups()
+                      .Get(objectName)
+                      .GetAllObjectsNames();
   else if (objectsAndGroups.GetObjectGroups().Has(objectName))
-    realObjects = objectsAndGroups.GetObjectGroups().Get(objectName).GetAllObjectsNames();
+    realObjects =
+        objectsAndGroups.GetObjectGroups().Get(objectName).GetAllObjectsNames();
   else
     realObjects.push_back(objectName);
 
@@ -892,7 +876,9 @@ gd::String EventsCodeGenerator::GenerateObjectFunctionCall(
     gd::String parametersStr,
     gd::String defaultOutput,
     gd::EventsCodeGenerationContext& context) {
-  return "TODO (GenerateObjectFunctionCall)";
+  // To be used for testing only.
+  return objectListName + "." + codeInfo.functionCallName + "(" +
+         parametersStr + ") ?? " + defaultOutput;
 }
 
 gd::String EventsCodeGenerator::GenerateObjectBehaviorFunctionCall(
@@ -903,7 +889,10 @@ gd::String EventsCodeGenerator::GenerateObjectBehaviorFunctionCall(
     gd::String parametersStr,
     gd::String defaultOutput,
     gd::EventsCodeGenerationContext& context) {
-  return "TODO (GenerateObjectBehaviorFunctionCall)";
+  // To be used for testing only.
+  return objectListName + "::" + behaviorName + "." +
+         codeInfo.functionCallName + "(" + parametersStr + ") ?? " +
+         defaultOutput;
 }
 
 gd::String EventsCodeGenerator::GenerateFreeCondition(
@@ -1134,9 +1123,10 @@ EventsCodeGenerator::EventsCodeGenerator(gd::Project& project_,
       maxCustomConditionsDepth(0),
       maxConditionsListsSize(0){};
 
-EventsCodeGenerator::EventsCodeGenerator(const gd::Platform& platform_,
-  gd::ObjectsContainer & globalObjectsAndGroups_,
-  const gd::ObjectsContainer & objectsAndGroups_)
+EventsCodeGenerator::EventsCodeGenerator(
+    const gd::Platform& platform_,
+    gd::ObjectsContainer& globalObjectsAndGroups_,
+    const gd::ObjectsContainer& objectsAndGroups_)
     : platform(platform_),
       globalObjectsAndGroups(globalObjectsAndGroups_),
       objectsAndGroups(objectsAndGroups_),

Core/GDCore/Events/CodeGeneration/EventsCodeGenerator.h

@@ -1,3 +1,8 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
 #ifndef GDCORE_EVENTSCODEGENERATOR_H
 #define GDCORE_EVENTSCODEGENERATOR_H
 
@@ -22,18 +27,19 @@ class EventsCodeGenerationContext;
 class ExpressionCodeGenerationInformation;
 class InstructionMetadata;
 class Platform;
-}
+}  // namespace gd
 
 namespace gd {
 
 /**
  * \brief Internal class used to generate code from events
- * \todo For now, this class generates only C++ code for GD C++ Platform.
- *
- * \see CallbacksForGeneratingExpressionCode
  */
 class GD_CORE_API EventsCodeGenerator {
+  // Compatiblity with old ExpressionParser
   friend class CallbacksForGeneratingExpressionCode;
+  friend class VariableCodeGenerationCallbacks;
+  // end of compatibility code
+  friend class ExpressionCodeGenerator;
 
  public:
   /**
@@ -53,9 +59,9 @@ class GD_CORE_API EventsCodeGenerator {
    * \brief Construct a code generator for the specified
    * objects/groups and platform
    */
-  EventsCodeGenerator(const gd::Platform& platform, 
-  gd::ObjectsContainer & globalObjectsAndGroups_,
-  const gd::ObjectsContainer & objectsAndGroups_);
+  EventsCodeGenerator(const gd::Platform& platform,
+                      gd::ObjectsContainer& globalObjectsAndGroups_,
+                      const gd::ObjectsContainer& objectsAndGroups_);
   virtual ~EventsCodeGenerator(){};
 
   /**
@@ -121,7 +127,7 @@ class GD_CORE_API EventsCodeGenerator {
    *
    */
   std::vector<gd::String> GenerateParametersCodes(
-      std::vector<gd::Expression> parameters,
+      const std::vector<gd::Expression> & parameters,
       const std::vector<gd::ParameterMetadata>& parametersInfo,
       EventsCodeGenerationContext& context,
       std::vector<std::pair<gd::String, gd::String> >*
@@ -182,9 +188,9 @@ class GD_CORE_API EventsCodeGenerator {
   virtual gd::String ConvertToString(gd::String plainString);
 
   /**
-   * \brief Convert a plain string ( with line feed, quotes ) to a string that
+   * \brief Convert a plain string (with line feed, quotes) to a string that
    can be inserted into code.
-   * The string construction must be explicit : for example, quotes must be
+   * The string construction must be explicit: for example, quotes must be
    added if the target language need quotes.
    *
    * Usage example :
@@ -278,23 +284,31 @@ class GD_CORE_API EventsCodeGenerator {
   void ReportError();
 
   /**
-   * \brief Return true if an error has occurred during code generation ( in
-   * this case, generated code is not usable )
+   * \brief Return true if an error has occurred during code generation (in
+   * this case, generated code is not usable).
+   *
+   * \todo TODO: This is actually not used and should be moved to a more
+   * complete error reporting.
    */
   bool ErrorOccurred() const { return errorOccurred; };
 
   /**
    * \brief Get the global objects/groups used for code generation.
    */
-  gd::ObjectsContainer& GetGlobalObjectsAndGroups() const { return globalObjectsAndGroups; }
+  gd::ObjectsContainer& GetGlobalObjectsAndGroups() const {
+    return globalObjectsAndGroups;
+  }
 
   /**
    * \brief Get the objects/groups used for code generation.
    */
-  const gd::ObjectsContainer& GetObjectsAndGroups() const { return objectsAndGroups; }
+  const gd::ObjectsContainer& GetObjectsAndGroups() const {
+    return objectsAndGroups;
+  }
 
   /**
-   * \brief Return true if the code generation is done for a given project and layout.
+   * \brief Return true if the code generation is done for a given project and
+   * layout.
    */
   bool HasProjectAndLayout() const { return hasProjectAndLayout; }
 
@@ -380,27 +394,36 @@ class GD_CORE_API EventsCodeGenerator {
    * \brief Generate the code to notify the profiler of the beginning of a
    * section.
    */
-  virtual gd::String GenerateProfilerSectionBegin(const gd::String& section) { return ""; };
+  virtual gd::String GenerateProfilerSectionBegin(const gd::String& section) {
+    return "";
+  };
 
   /**
    * \brief Generate the code to notify the profiler of the end of a section.
    */
-  virtual gd::String GenerateProfilerSectionEnd(const gd::String& section) { return ""; };
+  virtual gd::String GenerateProfilerSectionEnd(const gd::String& section) {
+    return "";
+  };
 
   /**
-   * \brief Get the namespace to be used to store code generated objects/values/functions,
-   * with the extra "dot" at the end to be used to access to a property/member.
+   * \brief Get the namespace to be used to store code generated
+   * objects/values/functions, with the extra "dot" at the end to be used to
+   * access to a property/member.
    *
    * Example: "gdjs.something."
    */
   virtual gd::String GetCodeNamespaceAccessor() { return ""; };
 
   /**
-   * \brief Get the namespace to be used to store code generated objects/values/functions.
+   * \brief Get the namespace to be used to store code generated
+   * objects/values/functions.
    *
    * Example: "gdjs.something"
    */
   virtual gd::String GetCodeNamespace() { return ""; };
+
+  enum VariableScope { LAYOUT_VARIABLE = 0, PROJECT_VARIABLE, OBJECT_VARIABLE };
+
  protected:
   /**
    * \brief Generate the code for a single parameter.
@@ -452,10 +475,69 @@ class GD_CORE_API EventsCodeGenerator {
       const gd::String& parameter,
       const gd::ParameterMetadata& metadata,
       gd::EventsCodeGenerationContext& context,
-      const gd::String& previousParameter,
+      const gd::String& lastObjectName,
       std::vector<std::pair<gd::String, gd::String> >*
           supplementaryParametersTypes);
 
+  /**
+   * \brief Generate the code to get a variable.
+   */
+  virtual gd::String GenerateGetVariable(
+      const gd::String& variableName,
+      const VariableScope& scope,
+      gd::EventsCodeGenerationContext& context,
+      const gd::String& objectName) {
+    if (scope == LAYOUT_VARIABLE) {
+      return "getLayoutVariable(" + variableName + ")";
+
+    } else if (scope == PROJECT_VARIABLE) {
+      return "getProjectVariable(" + variableName + ")";
+    }
+
+    return "getVariableForObject(" + objectName + ", " + variableName + ")";
+  }
+
+  /**
+   * \brief Generate the code to get the child of a variable.
+   */
+  virtual gd::String GenerateVariableAccessor(gd::String childName) {
+    return ".getChild(" + ConvertToStringExplicit(childName) + ")";
+  };
+
+  /**
+   * \brief Generate the code to get the child of a variable,
+   * using generated the expression.
+   */
+  virtual gd::String GenerateVariableBracketAccessor(
+      gd::String expressionCode) {
+    return ".getChild(" + expressionCode + ")";
+  };
+
+  /**
+   * \brief Generate the code to reference a variable which is
+   * in an empty/null state.
+   */
+  virtual gd::String GenerateBadVariable() { return "fakeBadVariable"; }
+
+  /**
+   * \brief Generate the code to reference an object.
+   * \param objectName the name of the object.
+   * \param type what is the expected type (object, objectPtr...) in which the
+   * object must be generated.
+   * \param context The context for code generation
+   */
+  virtual gd::String GenerateObject(const gd::String& objectName,
+                                    const gd::String& type,
+                                    gd::EventsCodeGenerationContext& context) {
+    return "fakeObjectListOf_" + objectName;
+  }
+
+  /**
+   * \brief Generate the code to reference an object which is
+   * in an empty/null state.
+   */
+  virtual gd::String GenerateBadObject() { return "fakeNullObject"; }
+
   /**
    * \brief Call a function of the current object.
    * \note The current object is the object being manipulated by a condition or
@@ -613,31 +695,34 @@ class GD_CORE_API EventsCodeGenerator {
                                  std::size_t startFromArgument = 0);
 
   /**
-   * \brief Must return an expression whose value is true.
+   * \brief Return the "true" keyword in the target language.
    */
   gd::String GenerateTrue() const { return "true"; };
 
   /**
-   * \brief Must return an expression whose value is false.
+   * \brief Return the "false" keyword in the target language.
    */
   gd::String GenerateFalse() const { return "false"; };
 
   /**
    * \brief Generate the list of comma-separated arguments to be used to call a
-   * function. \param arguments The code already generated for the arguments
+   * function.
+   *
+   * \param arguments The code already generated for the arguments
    * \param startFrom Index of the first argument, the previous will be ignored.
    */
   virtual gd::String GenerateArgumentsList(
       const std::vector<gd::String>& arguments, size_t startFrom = 0);
 
   const gd::Platform& platform;  ///< The platform being used.
-  
-  gd::ObjectsContainer & globalObjectsAndGroups; 
-  const gd::ObjectsContainer & objectsAndGroups;
 
-  bool hasProjectAndLayout;      ///< true only if project and layout are valid references. If false, they should not be used.
-  gd::Project* project;          ///< The project being used.
-  const gd::Layout* scene;       ///< The scene being generated.
+  gd::ObjectsContainer& globalObjectsAndGroups;
+  const gd::ObjectsContainer& objectsAndGroups;
+
+  bool hasProjectAndLayout;  ///< true only if project and layout are valid
+                             ///< references. If false, they should not be used.
+  gd::Project* project;      ///< The project being used.
+  const gd::Layout* scene;   ///< The scene being generated.
 
   bool errorOccurred;          ///< Must be set to true if an error occured.
   bool compilationForRuntime;  ///< Is set to true if the code generation is
@@ -652,7 +737,7 @@ class GD_CORE_API EventsCodeGenerator {
   gd::String customCodeInMain;  ///< Custom code inserted before events ( in
                                 ///< main function )
   std::set<gd::String>
-      customGlobalDeclarations;      ///< Custom global C++ declarations inserted
+      customGlobalDeclarations;     ///< Custom global C++ declarations inserted
                                     ///< after includes
   size_t maxCustomConditionsDepth;  ///< The maximum depth value for all the
                                     ///< custom conditions created.

Core/GDCore/Events/CodeGeneration/ExpressionCodeGenerator.cpp

@@ -0,0 +1,465 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "ExpressionCodeGenerator.h"
+#include <memory>
+#include <vector>
+#include "GDCore/CommonTools.h"
+#include "GDCore/Events/CodeGeneration/EventsCodeGenerationContext.h"
+#include "GDCore/Events/CodeGeneration/EventsCodeGenerator.h"
+#include "GDCore/Events/Parsers/ExpressionParser2.h"
+#include "GDCore/Events/Parsers/ExpressionParser2Node.h"
+#include "GDCore/Events/Parsers/ExpressionParser2NodePrinter.h"
+#include "GDCore/Events/Parsers/ExpressionParser2NodeWorker.h"
+#include "GDCore/Events/Tools/EventsCodeNameMangler.h"
+#include "GDCore/Extensions/Metadata/BehaviorMetadata.h"
+#include "GDCore/Extensions/Metadata/ExpressionMetadata.h"
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+#include "GDCore/Extensions/Metadata/ObjectMetadata.h"
+#include "GDCore/Extensions/Platform.h"
+#include "GDCore/Extensions/PlatformExtension.h"
+#include "GDCore/IDE/Events/ExpressionValidator.h"
+#include "GDCore/Project/Layout.h"
+#include "GDCore/Project/Project.h"
+
+// Compatibility with old ExpressionParser
+#include "GDCore/Events/CodeGeneration/ExpressionsCodeGeneration.h"
+#include "GDCore/Events/CodeGeneration/VariableParserCallbacks.h"
+#include "GDCore/Events/Parsers/ExpressionParser.h"
+#include "GDCore/Events/Parsers/VariableParser.h"
+// end of compatibility code
+
+namespace gd {
+
+bool ExpressionCodeGenerator::useOldExpressionParser = false;
+
+gd::String ExpressionCodeGenerator::GenerateExpressionCode(
+    EventsCodeGenerator& codeGenerator,
+    EventsCodeGenerationContext& context,
+    const gd::String& type,
+    const gd::String& expression,
+    const gd::String& objectName) {
+  // Compatibility with old ExpressionParser
+  if (useOldExpressionParser) {
+    if (type == "number") {
+      gd::String code = "";
+      gd::CallbacksForGeneratingExpressionCode callbacks(
+          code, codeGenerator, context);
+      gd::ExpressionParser parser(expression);
+      if (!parser.ParseMathExpression(codeGenerator.GetPlatform(),
+                                      codeGenerator.GetGlobalObjectsAndGroups(),
+                                      codeGenerator.GetObjectsAndGroups(),
+                                      callbacks) ||
+          code.empty()) {
+        std::cout << "Error (old ExpressionParser): \""
+                  << parser.GetFirstError() << "\" in: \"" << expression
+                  << "\" (number)" << std::endl;
+        code = "0";
+      }
+
+      return code;
+    } else if (type == "string") {
+      gd::String code = "";
+      gd::CallbacksForGeneratingExpressionCode callbacks(
+          code, codeGenerator, context);
+      gd::ExpressionParser parser(expression);
+      if (!parser.ParseStringExpression(
+              codeGenerator.GetPlatform(),
+              codeGenerator.GetGlobalObjectsAndGroups(),
+              codeGenerator.GetObjectsAndGroups(),
+              callbacks) ||
+          code.empty()) {
+        std::cout << "Error (old ExpressionParser): \""
+                  << parser.GetFirstError() << "\" in: \"" << expression
+                  << "\" (string)" << std::endl;
+        code = "\"\"";
+      }
+
+      return code;
+    } else if (type == "scenevar") {
+      gd::String code = "";
+      gd::VariableCodeGenerationCallbacks callbacks(
+          code,
+          codeGenerator,
+          context,
+          gd::EventsCodeGenerator::LAYOUT_VARIABLE);
+
+      gd::VariableParser parser(expression);
+      if (!parser.Parse(callbacks)) {
+        std::cout << "Error (old VariableParser) :" << parser.GetFirstError()
+                  << " in: " << expression << std::endl;
+        code = codeGenerator.GenerateBadVariable();
+      }
+      return code;
+    } else if (type == "globalvar") {
+      gd::String code = "";
+      gd::VariableCodeGenerationCallbacks callbacks(
+          code,
+          codeGenerator,
+          context,
+          gd::EventsCodeGenerator::PROJECT_VARIABLE);
+
+      gd::VariableParser parser(expression);
+      if (!parser.Parse(callbacks)) {
+        std::cout << "Error (old VariableParser) :" << parser.GetFirstError()
+                  << " in: " << expression << std::endl;
+        code = codeGenerator.GenerateBadVariable();
+      }
+      return code;
+    } else if (type == "objectvar") {
+      gd::String code = "";
+
+      // Object is either the object of the previous parameter or, if it is
+      // empty, the object being picked by the instruction.
+      gd::String object =
+          objectName.empty() ? context.GetCurrentObject() : objectName;
+
+      gd::VariableCodeGenerationCallbacks callbacks(
+          code, codeGenerator, context, object);
+
+      gd::VariableParser parser(expression);
+      if (!parser.Parse(callbacks)) {
+        std::cout << "Error (old VariableParser) :" << parser.GetFirstError()
+                  << " in: " << expression << std::endl;
+        code = codeGenerator.GenerateBadVariable();
+      }
+      return code;
+    }
+
+    std::cout << "Type error (old ExpressionParser): type \"" << type
+              << "\" is not supported" << std::endl;
+    return "/* Error during code generation: type " + type +
+           " is not supported for old ExpressionParser. */ 0";
+  }
+  // end of compatibility code
+
+  gd::ExpressionParser2 parser(codeGenerator.GetPlatform(),
+                               codeGenerator.GetGlobalObjectsAndGroups(),
+                               codeGenerator.GetObjectsAndGroups());
+  auto node = parser.ParseExpression(type, expression, objectName);
+  gd::ExpressionValidator validator;
+  node->Visit(validator);
+
+  ExpressionCodeGenerator generator(codeGenerator, context);
+  if (!validator.GetErrors().empty()) {
+    std::cout << "Error: \"" << validator.GetErrors()[0]->GetMessage()
+              << "\" in: \"" << expression << "\" (" << type << ")"
+              << std::endl;
+
+    return generator.GenerateDefaultValue(type);
+  }
+
+  node->Visit(generator);
+  return generator.GetOutput();
+}
+
+void ExpressionCodeGenerator::OnVisitOperatorNode(OperatorNode& node) {
+  node.leftHandSide->Visit(*this);
+  output += " ";
+  output.push_back(node.op);
+  output += " ";
+  node.rightHandSide->Visit(*this);
+}
+
+void ExpressionCodeGenerator::OnVisitUnaryOperatorNode(
+    UnaryOperatorNode& node) {
+  output.push_back(node.op);
+  output += "(";  // Add extra parenthesis to ensure that things like --2 are
+                  // properly outputted as -(-2) (GDevelop don't have -- or ++
+                  // operators, but JavaScript and C++ have).
+  node.factor->Visit(*this);
+  output += ")";
+}
+
+void ExpressionCodeGenerator::OnVisitSubExpressionNode(
+    SubExpressionNode& node) {
+  output += "(";
+  node.expression->Visit(*this);
+  output += ")";
+}
+
+void ExpressionCodeGenerator::OnVisitNumberNode(NumberNode& node) {
+  output += node.number;
+}
+
+void ExpressionCodeGenerator::OnVisitTextNode(TextNode& node) {
+  output += codeGenerator.ConvertToStringExplicit(node.text);
+}
+
+void ExpressionCodeGenerator::OnVisitVariableNode(VariableNode& node) {
+  // This "translation" from the type to an enum could be avoided
+  // if all types were moved to an enum.
+  EventsCodeGenerator::VariableScope scope =
+      node.type == "globalvar"
+          ? gd::EventsCodeGenerator::PROJECT_VARIABLE
+          : ((node.type == "scenevar")
+                 ? gd::EventsCodeGenerator::LAYOUT_VARIABLE
+                 : gd::EventsCodeGenerator::OBJECT_VARIABLE);
+
+  output += codeGenerator.GenerateGetVariable(
+      node.name, scope, context, node.objectName);
+  if (node.child) node.child->Visit(*this);
+}
+
+void ExpressionCodeGenerator::OnVisitVariableAccessorNode(
+    VariableAccessorNode& node) {
+  output += codeGenerator.GenerateVariableAccessor(node.name);
+  if (node.child) node.child->Visit(*this);
+}
+
+void ExpressionCodeGenerator::OnVisitVariableBracketAccessorNode(
+    VariableBracketAccessorNode& node) {
+  ExpressionCodeGenerator generator(codeGenerator, context);
+  node.expression->Visit(generator);
+  output +=
+      codeGenerator.GenerateVariableBracketAccessor(generator.GetOutput());
+  if (node.child) node.child->Visit(*this);
+}
+
+void ExpressionCodeGenerator::OnVisitIdentifierNode(IdentifierNode& node) {
+  if (gd::ParameterMetadata::IsObject(node.type)) {
+    output +=
+        codeGenerator.GenerateObject(node.identifierName, node.type, context);
+  } else {
+    output += "/* Error during generation, unrecognized identifier type: " +
+              codeGenerator.ConvertToString(node.type) + " with value " +
+              codeGenerator.ConvertToString(node.identifierName) + " */ " +
+              codeGenerator.ConvertToStringExplicit(node.identifierName);
+  }
+}
+
+void ExpressionCodeGenerator::OnVisitFunctionNode(FunctionNode& node) {
+  if (gd::MetadataProvider::IsBadExpressionMetadata(node.expressionMetadata)) {
+    output += "/* Error during generation, function not found: " +
+              codeGenerator.ConvertToString(node.functionName) + " for type " +
+              node.type + " */ " + GenerateDefaultValue(node.type);
+    return;
+  }
+
+  if (!node.objectName.empty()) {
+    if (!node.behaviorName.empty()) {
+      output += GenerateBehaviorFunctionCode(node.type,
+                                             node.objectName,
+                                             node.behaviorName,
+                                             node.parameters,
+                                             node.expressionMetadata);
+    } else {
+      output += GenerateObjectFunctionCode(
+          node.type, node.objectName, node.parameters, node.expressionMetadata);
+    }
+  } else {
+    output +=
+        GenerateFreeFunctionCode(node.parameters, node.expressionMetadata);
+  }
+}
+
+gd::String ExpressionCodeGenerator::GenerateFreeFunctionCode(
+    const std::vector<std::unique_ptr<ExpressionNode>>& parameters,
+    const ExpressionMetadata& expressionMetadata) {
+  codeGenerator.AddIncludeFiles(
+      expressionMetadata.codeExtraInformation.GetIncludeFiles());
+
+  // Launch custom code generator if needed
+  if (expressionMetadata.codeExtraInformation.HasCustomCodeGenerator()) {
+    return expressionMetadata.codeExtraInformation.customCodeGenerator(
+        PrintParameters(parameters), codeGenerator, context);
+  }
+
+  gd::String parametersCode =
+      GenerateParametersCodes(parameters, expressionMetadata, 0);
+
+  return expressionMetadata.codeExtraInformation.functionCallName + "(" +
+         parametersCode + ")";
+}
+
+gd::String ExpressionCodeGenerator::GenerateObjectFunctionCode(
+    const gd::String& type,
+    const gd::String& objectName,
+    const std::vector<std::unique_ptr<ExpressionNode>>& parameters,
+    const ExpressionMetadata& expressionMetadata) {
+  const gd::ObjectsContainer& globalObjectsAndGroups =
+      codeGenerator.GetGlobalObjectsAndGroups();
+  const gd::ObjectsContainer& objectsAndGroups =
+      codeGenerator.GetObjectsAndGroups();
+
+  codeGenerator.AddIncludeFiles(
+      expressionMetadata.codeExtraInformation.GetIncludeFiles());
+
+  // Launch custom code generator if needed
+  if (expressionMetadata.codeExtraInformation.HasCustomCodeGenerator()) {
+    return expressionMetadata.codeExtraInformation.customCodeGenerator(
+        PrintParameters(parameters), codeGenerator, context);
+  }
+
+  // Prepare parameters
+  gd::String parametersCode = GenerateParametersCodes(
+      parameters,
+      expressionMetadata,
+      // By convention, the first parameter is the object
+      1);
+
+  gd::String functionOutput = GenerateDefaultValue(type);
+
+  // Get object(s) concerned by function call
+  std::vector<gd::String> realObjects =
+      codeGenerator.ExpandObjectsName(objectName, context);
+  for (std::size_t i = 0; i < realObjects.size(); ++i) {
+    context.ObjectsListNeeded(realObjects[i]);
+
+    gd::String objectType = gd::GetTypeOfObject(
+        globalObjectsAndGroups, objectsAndGroups, realObjects[i]);
+    const ObjectMetadata& objInfo = MetadataProvider::GetObjectMetadata(
+        codeGenerator.GetPlatform(), objectType);
+
+    codeGenerator.AddIncludeFiles(objInfo.includeFiles);
+    functionOutput = codeGenerator.GenerateObjectFunctionCall(
+        realObjects[i],
+        objInfo,
+        expressionMetadata.codeExtraInformation,
+        parametersCode,
+        functionOutput,
+        context);
+  }
+
+  return functionOutput;
+}
+gd::String ExpressionCodeGenerator::GenerateBehaviorFunctionCode(
+    const gd::String& type,
+    const gd::String& objectName,
+    const gd::String& behaviorName,
+    const std::vector<std::unique_ptr<ExpressionNode>>& parameters,
+    const ExpressionMetadata& expressionMetadata) {
+  const gd::ObjectsContainer& globalObjectsAndGroups =
+      codeGenerator.GetGlobalObjectsAndGroups();
+  const gd::ObjectsContainer& objectsAndGroups =
+      codeGenerator.GetObjectsAndGroups();
+
+  codeGenerator.AddIncludeFiles(
+      expressionMetadata.codeExtraInformation.GetIncludeFiles());
+
+  // Launch custom code generator if needed
+  if (expressionMetadata.codeExtraInformation.HasCustomCodeGenerator()) {
+    return expressionMetadata.codeExtraInformation.customCodeGenerator(
+        PrintParameters(parameters), codeGenerator, context);
+  }
+
+  // Prepare parameters
+  gd::String parametersCode = GenerateParametersCodes(
+      parameters,
+      expressionMetadata,
+      // By convention, the first parameters are the object and behavior
+      2);
+
+  // Get object(s) concerned by function call
+  std::vector<gd::String> realObjects =
+      codeGenerator.ExpandObjectsName(objectName, context);
+
+  gd::String functionOutput = GenerateDefaultValue(type);
+
+  gd::String behaviorType = gd::GetTypeOfBehavior(
+      globalObjectsAndGroups, objectsAndGroups, behaviorName);
+  const BehaviorMetadata& autoInfo = MetadataProvider::GetBehaviorMetadata(
+      codeGenerator.GetPlatform(), behaviorType);
+
+  for (std::size_t i = 0; i < realObjects.size(); ++i) {
+    context.ObjectsListNeeded(realObjects[i]);
+
+    codeGenerator.AddIncludeFiles(autoInfo.includeFiles);
+    functionOutput = codeGenerator.GenerateObjectBehaviorFunctionCall(
+        realObjects[i],
+        behaviorName,
+        autoInfo,
+        expressionMetadata.codeExtraInformation,
+        parametersCode,
+        functionOutput,
+        context);
+  }
+
+  return functionOutput;
+}
+
+gd::String ExpressionCodeGenerator::GenerateParametersCodes(
+    const std::vector<std::unique_ptr<ExpressionNode>>& parameters,
+    const ExpressionMetadata& expressionMetadata,
+    size_t initialParameterIndex) {
+  size_t nonCodeOnlyParameterIndex = 0;
+  gd::String parametersCode;
+  for (std::size_t i = initialParameterIndex;
+       i < expressionMetadata.parameters.size();
+       ++i) {
+    if (i != initialParameterIndex) parametersCode += ", ";
+
+    auto& parameterMetadata = expressionMetadata.parameters[i];
+    if (!parameterMetadata.IsCodeOnly()) {
+      ExpressionCodeGenerator generator(codeGenerator, context);
+      if (nonCodeOnlyParameterIndex < parameters.size()) {
+        parameters[nonCodeOnlyParameterIndex]->Visit(generator);
+        parametersCode += generator.GetOutput();
+      } else if (parameterMetadata.IsOptional()) {
+        // Optional parameters default value were not parsed at the time of the
+        // expression parsing. Parse them now.
+        ExpressionParser2 parser(codeGenerator.GetPlatform(),
+                                 codeGenerator.GetGlobalObjectsAndGroups(),
+                                 codeGenerator.GetObjectsAndGroups());
+        auto node = parser.ParseExpression(parameterMetadata.GetType(),
+                                           parameterMetadata.GetDefaultValue());
+
+        node->Visit(generator);
+        parametersCode += generator.GetOutput();
+      } else {
+        parametersCode +=
+            "/* Error during generation, parameter not existing in the nodes "
+            "*/ " +
+            GenerateDefaultValue(parameterMetadata.GetType());
+      }
+
+      nonCodeOnlyParameterIndex++;
+    } else {
+      parametersCode +=
+          codeGenerator.GenerateParameterCodes(parameterMetadata.GetExtraInfo(),
+                                               parameterMetadata,
+                                               context,
+                                               "",
+                                               nullptr);
+    }
+  }
+
+  return parametersCode;
+}
+
+std::vector<gd::Expression> ExpressionCodeGenerator::PrintParameters(
+    const std::vector<std::unique_ptr<ExpressionNode>>& parameters) {
+  // Printing parameters is only useful because custom code generator of
+  // expression require to get the parameters of the expression as strings
+  // (gd::Expression). Once the old ExpressionParser is removed, custom
+  // code generator can be reworked to directly take the parsed nodes,
+  // avoiding an extra and useless printing/parsing of their parameters.
+
+  std::vector<gd::Expression> printedParameters;
+  for (auto& parameter : parameters) {
+    printedParameters.push_back(
+        gd::ExpressionParser2NodePrinter::PrintNode(*parameter));
+  }
+
+  return printedParameters;
+}
+
+gd::String ExpressionCodeGenerator::GenerateDefaultValue(
+    const gd::String& type) {
+  if (gd::ParameterMetadata::IsExpression("variable", type)) {
+    return codeGenerator.GenerateBadVariable();
+  }
+  if (gd::ParameterMetadata::IsObject(type)) {
+    return codeGenerator.GenerateBadObject();
+  }
+
+  return (type == "string") ? "\"\"" : "0";
+}
+
+void ExpressionCodeGenerator::OnVisitEmptyNode(EmptyNode& node) {
+  output += GenerateDefaultValue(node.type);
+}
+
+}  // namespace gd

Core/GDCore/Events/CodeGeneration/ExpressionCodeGenerator.h

@@ -0,0 +1,117 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#if defined(GD_IDE_ONLY)
+#ifndef GDCORE_ExpressionCodeGenerator_H
+#define GDCORE_ExpressionCodeGenerator_H
+
+#include <memory>
+#include <vector>
+#include "GDCore/Events/Parsers/ExpressionParser2.h"
+#include "GDCore/Events/Parsers/ExpressionParser2Node.h"
+#include "GDCore/Events/Parsers/ExpressionParser2NodeWorker.h"
+#include "GDCore/String.h"
+namespace gd {
+class Expression;
+class ObjectsContainer;
+class Platform;
+class ParameterMetadata;
+class ExpressionMetadata;
+class EventsCodeGenerationContext;
+class EventsCodeGenerator;
+}  // namespace gd
+
+namespace gd {
+
+/**
+ * \brief Generate code for a parsed expression.
+ *
+ * Almost all code generation is dedicated to the gd::EventsCodeGenerator,
+ * so that it can be adapted to the target.
+ *
+ * \see gd::ExpressionParser2
+ */
+class GD_CORE_API ExpressionCodeGenerator : public ExpressionParser2NodeWorker {
+ public:
+  ExpressionCodeGenerator(EventsCodeGenerator& codeGenerator_,
+                          EventsCodeGenerationContext& context_)
+      : codeGenerator(codeGenerator_), context(context_){};
+  virtual ~ExpressionCodeGenerator(){};
+
+  /**
+   * Helper to generate the code for an expression.
+   * If expression is invalid, a default generated value is returned (0 for
+   * number expression, empty string for strings).
+   *
+   * \param codeGenerator The code generator to use to output code.
+   * \param context The context of the code generation.
+   * \param type The type of the expression (see gd::ExpressionParser2).
+   * \param expression The expression to parse and generate code for.
+   * \param object The object the expression refers too (only for "objectvar"
+   * type).
+   *
+   * \see see gd::ExpressionParser2
+   */
+  static gd::String GenerateExpressionCode(EventsCodeGenerator& codeGenerator,
+                                           EventsCodeGenerationContext& context,
+                                           const gd::String& type,
+                                           const gd::String& expression,
+                                           const gd::String& objectName = "");
+
+  static void UseOldExpressionParser(bool enable) {
+    useOldExpressionParser = enable;
+  };
+  static bool IsUsingOldExpressionParser() { return useOldExpressionParser; };
+
+  const gd::String& GetOutput() { return output; };
+
+ protected:
+  void OnVisitSubExpressionNode(SubExpressionNode& node) override;
+  void OnVisitOperatorNode(OperatorNode& node) override;
+  void OnVisitUnaryOperatorNode(UnaryOperatorNode& node) override;
+  void OnVisitNumberNode(NumberNode& node) override;
+  void OnVisitTextNode(TextNode& node) override;
+  void OnVisitVariableNode(VariableNode& node) override;
+  void OnVisitVariableAccessorNode(VariableAccessorNode& node) override;
+  void OnVisitVariableBracketAccessorNode(
+      VariableBracketAccessorNode& node) override;
+  void OnVisitIdentifierNode(IdentifierNode& node) override;
+  void OnVisitFunctionNode(FunctionNode& node) override;
+  void OnVisitEmptyNode(EmptyNode& node) override;
+
+ private:
+  gd::String GenerateFreeFunctionCode(
+      const std::vector<std::unique_ptr<ExpressionNode>>& parameters,
+      const ExpressionMetadata& expressionMetadata);
+  gd::String GenerateObjectFunctionCode(
+      const gd::String& type,
+      const gd::String& objectName,
+      const std::vector<std::unique_ptr<ExpressionNode>>& parameters,
+      const ExpressionMetadata& expressionMetadata);
+  gd::String GenerateBehaviorFunctionCode(
+      const gd::String& type,
+      const gd::String& objectName,
+      const gd::String& behaviorName,
+      const std::vector<std::unique_ptr<ExpressionNode>>& parameters,
+      const ExpressionMetadata& expressionMetadata);
+  gd::String GenerateParametersCodes(
+      const std::vector<std::unique_ptr<ExpressionNode>>& parameters,
+      const ExpressionMetadata& expressionMetadata,
+      size_t initialParameterIndex);
+  gd::String GenerateDefaultValue(const gd::String& type);
+  static std::vector<gd::Expression> PrintParameters(
+      const std::vector<std::unique_ptr<ExpressionNode>>& parameters);
+
+  gd::String output;
+  EventsCodeGenerator& codeGenerator;
+  EventsCodeGenerationContext& context;
+
+  static bool useOldExpressionParser;
+};
+
+}  // namespace gd
+
+#endif  // GDCORE_ExpressionCodeGenerator_H
+#endif

Core/GDCore/Events/CodeGeneration/ExpressionsCodeGeneration.h

@@ -11,28 +11,18 @@
 #include "GDCore/String.h"
 namespace gd {
 class ExpressionMetadata;
-}
-namespace gd {
 class Expression;
-}
-namespace gd {
 class Project;
-}
-namespace gd {
 class Layout;
-}
-namespace gd {
 class Layout;
-}
-namespace gd {
 class EventsCodeGenerationContext;
-}
-namespace gd {
 class EventsCodeGenerator;
 }
 
 namespace gd {
 
+// TODO: Replace and remove (ExpressionCodeGenerator)
+
 /**
  * \brief Used to generate code from expressions.
  *

Core/GDCore/Events/CodeGeneration/VariableParserCallbacks.cpp

@@ -0,0 +1,68 @@
+/*
+ * GDevelop C++ Platform
+ * 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 "VariableParserCallbacks.h"
+#include <string>
+#include <vector>
+#include "GDCore/Events/CodeGeneration/EventsCodeGenerationContext.h"
+#include "GDCore/Events/CodeGeneration/EventsCodeGenerator.h"
+#include "GDCore/Events/CodeGeneration/ExpressionCodeGenerator.h"
+#include "GDCore/Events/Parsers/VariableParser.h"
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+#include "GDCore/Extensions/Metadata/ObjectMetadata.h"
+#include "GDCore/Extensions/Platform.h"
+#include "GDCore/Project/Layout.h"
+#include "GDCore/Project/Object.h"
+#include "GDCore/Project/Project.h"
+
+using namespace std;
+
+namespace gd {
+
+VariableCodeGenerationCallbacks::VariableCodeGenerationCallbacks(
+    gd::String& output_,
+    gd::EventsCodeGenerator& codeGenerator_,
+    gd::EventsCodeGenerationContext& context_,
+    const gd::EventsCodeGenerator::VariableScope& scope_)
+    : output(output_),
+      codeGenerator(codeGenerator_),
+      context(context_),
+      scope(scope_) {
+  if (scope == gd::EventsCodeGenerator::OBJECT_VARIABLE) {
+    std::cout << "ERROR: Initializing VariableCodeGenerationCallbacks with "
+                 "OBJECT_VARIABLE without object.";
+  }
+}
+
+VariableCodeGenerationCallbacks::VariableCodeGenerationCallbacks(
+    gd::String& output_,
+    gd::EventsCodeGenerator& codeGenerator_,
+    gd::EventsCodeGenerationContext& context_,
+    const gd::String& object_)
+    : output(output_),
+      codeGenerator(codeGenerator_),
+      context(context_),
+      scope(gd::EventsCodeGenerator::OBJECT_VARIABLE),
+      object(object_) {}
+
+void VariableCodeGenerationCallbacks::OnRootVariable(gd::String variableName) {
+  output += codeGenerator.GenerateGetVariable(variableName, scope, context, object);
+}
+
+void VariableCodeGenerationCallbacks::OnChildVariable(gd::String variableName) {
+  output += codeGenerator.GenerateVariableAccessor(variableName);
+}
+
+void VariableCodeGenerationCallbacks::OnChildSubscript(
+    gd::String stringExpression) {
+  gd::String argumentCode = gd::ExpressionCodeGenerator::GenerateExpressionCode(
+      codeGenerator, context, "string", stringExpression);
+
+  output += codeGenerator.GenerateVariableBracketAccessor(argumentCode);
+}
+
+}
+#endif

Core/GDCore/Events/CodeGeneration/VariableParserCallbacks.h

@@ -10,12 +10,15 @@
 #include <string>
 #include <vector>
 #include "GDCore/Events/Parsers/VariableParser.h"
-#include "GDCpp/Runtime/String.h"
+#include "GDCore/String.h"
+#include "EventsCodeGenerator.h"
 namespace gd {
-class EventsCodeGenerator;
 class EventsCodeGenerationContext;
 }  // namespace gd
 
+// TODO: Replace and remove (ExpressionCodeGenerator)
+namespace gd {
+
 /**
  * \brief Callbacks called to generate the code for getting a variable.
  *
@@ -36,8 +39,6 @@ class EventsCodeGenerationContext;
  */
 class VariableCodeGenerationCallbacks : public gd::VariableParserCallbacks {
  public:
-  enum VariableScope { LAYOUT_VARIABLE = 0, PROJECT_VARIABLE, OBJECT_VARIABLE };
-
   /**
    * \brief Default constructor for generating code for a layout/global
    * variable. \param output The string in which the code will be generated.
@@ -49,7 +50,7 @@ class VariableCodeGenerationCallbacks : public gd::VariableParserCallbacks {
   VariableCodeGenerationCallbacks(gd::String& output,
                                   gd::EventsCodeGenerator& codeGenerator_,
                                   gd::EventsCodeGenerationContext& context_,
-                                  const VariableScope& scope_);
+                                  const gd::EventsCodeGenerator::VariableScope& scope_);
   /**
 
    * \brief Default constructor for generating code for an object variable.
@@ -86,9 +87,11 @@ class VariableCodeGenerationCallbacks : public gd::VariableParserCallbacks {
   gd::String& output;
   gd::EventsCodeGenerator& codeGenerator;
   gd::EventsCodeGenerationContext& context;
-  VariableScope scope;
+  gd::EventsCodeGenerator::VariableScope scope;
   const gd::String object;  ///< The object name, when scope == OBJECT_VARIABLE.
 };
 
+}
+
 #endif  // VARIABLEPARSERCALLBACKS_H
 #endif

Core/GDCore/Events/Event.h

@@ -15,38 +15,18 @@
 #include "GDCore/String.h"
 namespace gd {
 class EventsList;
-}
-namespace gd {
 class MainFrameWrapper;
-}
-namespace gd {
 class Project;
-}
-namespace gd {
 class Layout;
-}
-namespace gd {
 class EventsCodeGenerator;
-}
-namespace gd {
 class EventsCodeGenerationContext;
-}
-namespace gd {
 class Platform;
-}
-class wxWindow;
-namespace gd {
 class EventsEditorItemsAreas;
-}
-namespace gd {
 class EventsEditorSelection;
-}
-namespace gd {
 class SerializerElement;
-}
-namespace gd {
 class Instruction;
 }
+class wxWindow;
 class wxDC;
 
 namespace gd {

Core/GDCore/Events/Parsers/ExpressionParser.cpp

@@ -450,9 +450,7 @@ bool ExpressionParser::ParseMathExpression(const gd::Platform& platform,
                                   parameters[i],
                                   instructionInfos.parameters[i],
                                   functionNameEnd))
-              return false;  // TODO : Boarf, param<61>tres optionels sont rajout<75>s
-                             // et <20>valu<6C>s : Probl<62>me avec les calques par
-                             // exemple ( Au minimum, il faut "" )
+              return false;
           }
         } else {
           firstErrorPos = functionNameEnd;
@@ -719,9 +717,6 @@ bool ExpressionParser::ParseStringExpression(const gd::Platform& platform,
           firstErrorPos = functionNameEnd;
           firstErrorStr = _("Incorrect number of parameters");
 
-          for (std::size_t i = 0; i < parameters.size(); ++i)
-            cout << "Param:" << parameters[i].GetPlainString() << endl;
-
           return false;
         }
 

Core/GDCore/Events/Parsers/ExpressionParser2.cpp

@@ -0,0 +1,220 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "GDCore/Events/Parsers/ExpressionParser2.h"
+#include <algorithm>
+#include <memory>
+#include <vector>
+#include "GDCore/CommonTools.h"
+#include "GDCore/Events/Expression.h"
+#include "GDCore/Extensions/Metadata/ExpressionMetadata.h"
+#include "GDCore/Extensions/Metadata/InstructionMetadata.h"
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+#include "GDCore/Extensions/Platform.h"
+#include "GDCore/Project/Layout.h"
+#include "GDCore/Project/Project.h"
+#include "GDCore/Tools/Localization.h"
+#include "GDCore/Tools/MakeUnique.h"
+
+using namespace std;
+
+namespace gd {
+
+gd::String ExpressionParser2::NUMBER_FIRST_CHAR = ".0123456789";
+gd::String ExpressionParser2::DOT = ".";
+gd::String ExpressionParser2::PARAMETERS_SEPARATOR = ",";
+gd::String ExpressionParser2::QUOTE = "\"";
+gd::String ExpressionParser2::BRACKETS = "()[]{}";
+gd::String ExpressionParser2::EXPRESSION_OPERATORS = "+-<>?^=\\:!";
+gd::String ExpressionParser2::TERM_OPERATORS = "/*";
+gd::String ExpressionParser2::UNARY_OPERATORS = "+-";
+gd::String ExpressionParser2::WHITESPACES = " \n\r";
+gd::String ExpressionParser2::NAMESPACE_SEPARATOR = "::";
+
+ExpressionParser2::ExpressionParser2(
+    const gd::Platform& platform_,
+    const gd::ObjectsContainer& globalObjectsContainer_,
+    const gd::ObjectsContainer& objectsContainer_)
+    : expression(""),
+      currentPosition(0),
+      platform(platform_),
+      globalObjectsContainer(globalObjectsContainer_),
+      objectsContainer(objectsContainer_) {}
+
+namespace {
+/**
+ * Return the minimum number of parameters, starting from a given parameter
+ * (by convention, 1 for object functions and 2 for behavior functions).
+ */
+size_t GetMinimumParametersNumber(
+    const std::vector<gd::ParameterMetadata>& parameters,
+    size_t initialParameterIndex) {
+  size_t nb = 0;
+  for (std::size_t i = initialParameterIndex; i < parameters.size(); ++i) {
+    if (!parameters[i].optional && !parameters[i].codeOnly) nb++;
+  }
+
+  return nb;
+}
+
+/**
+ * Return the maximum number of parameters, starting from a given parameter
+ * (by convention, 1 for object functions and 2 for behavior functions).
+ */
+size_t GetMaximumParametersNumber(
+    const std::vector<gd::ParameterMetadata>& parameters,
+    size_t initialParameterIndex) {
+  size_t nb = 0;
+  for (std::size_t i = initialParameterIndex; i < parameters.size(); ++i) {
+    if (!parameters[i].codeOnly) nb++;
+  }
+
+  return nb;
+}
+}  // namespace
+
+std::unique_ptr<ExpressionParserDiagnostic> ExpressionParser2::ValidateFunction(
+    const gd::FunctionNode& function, size_t functionStartPosition) {
+  if (gd::MetadataProvider::IsBadExpressionMetadata(
+          function.expressionMetadata)) {
+    return gd::make_unique<ExpressionParserError>(
+        "invalid_function_name",
+        _("Cannot find an expression with this name: ") +
+            function.functionName + "\n" +
+            _("Double check that you've not made any typo in the name."),
+        functionStartPosition,
+        GetCurrentPosition());
+  }
+
+  size_t minParametersCount = GetMinimumParametersNumber(
+      function.expressionMetadata.parameters,
+      WrittenParametersFirstIndex(function.objectName, function.behaviorName));
+  size_t maxParametersCount = GetMaximumParametersNumber(
+      function.expressionMetadata.parameters,
+      WrittenParametersFirstIndex(function.objectName, function.behaviorName));
+  if (function.parameters.size() < minParametersCount ||
+      function.parameters.size() > maxParametersCount) {
+    gd::String expectedCountMessage =
+        minParametersCount == maxParametersCount
+            ? _("The number of parameters must be exactly ") +
+                  gd::String::From(minParametersCount)
+            : _("The number of parameters must be: ") +
+                  gd::String::From(minParametersCount) + "-" +
+                  gd::String::From(maxParametersCount);
+
+    if (function.parameters.size() < minParametersCount) {
+      return gd::make_unique<ExpressionParserError>(
+          "too_few_parameters",
+          "You have not entered enough parameters for the expression. " +
+              expectedCountMessage,
+          functionStartPosition,
+          GetCurrentPosition());
+    }
+  }
+
+  return gd::make_unique<ExpressionParserDiagnostic>();
+}
+
+std::unique_ptr<TextNode> ExpressionParser2::ReadText() {
+  SkipWhitespace();
+  if (!IsAnyChar("\"")) {
+    auto text = gd::make_unique<TextNode>("");
+    text->diagnostic =
+        RaiseSyntaxError(_("A text must start with a double quote (\")."));
+    return text;
+  }
+  SkipChar();
+
+  gd::String parsedText = "";
+  bool textParsingHasEnded = false;
+  bool expectEscapedCharacter = false;
+  while (!IsEndReached() && !textParsingHasEnded) {
+    if (GetCurrentChar() == '"') {
+      if (expectEscapedCharacter) {
+        parsedText += '"';
+        expectEscapedCharacter = false;
+      } else {
+        textParsingHasEnded = true;
+      }
+    } else if (GetCurrentChar() == '\\') {
+      if (expectEscapedCharacter) {
+        parsedText += '\\';
+        expectEscapedCharacter = false;
+      } else {
+        expectEscapedCharacter = true;
+      }
+    } else {
+      if (expectEscapedCharacter) {
+        parsedText += '\\';
+      }
+
+      parsedText += GetCurrentChar();
+    }
+
+    currentPosition++;
+  }
+
+  auto text = gd::make_unique<TextNode>(parsedText);
+  if (!textParsingHasEnded) {
+    text->diagnostic =
+        RaiseSyntaxError(_("A text must end with a double quote (\"). Add a "
+                           "double quote to terminate the text."));
+  }
+
+  return text;
+}
+
+std::unique_ptr<NumberNode> ExpressionParser2::ReadNumber() {
+  SkipWhitespace();
+  gd::String parsedNumber;
+
+  bool numberHasStarted = false;
+  bool digitFound = false;
+  bool dotFound = false;
+  while (!IsEndReached()) {
+    if (IsAnyChar("0")) {
+      numberHasStarted = true;
+      digitFound = true;
+      if (!parsedNumber.empty()) { // Ignore leading 0s.
+        parsedNumber += GetCurrentChar();
+      }
+    } else if (IsAnyChar("123456789")) {
+      numberHasStarted = true;
+      digitFound = true;
+      parsedNumber += GetCurrentChar();
+    } else if (IsAnyChar(".") && !dotFound) {
+      numberHasStarted = true;
+      dotFound = true;
+      if (parsedNumber == "") {
+        parsedNumber += "0."; //Normalize by adding a leading 0, only in this case.
+      } else {
+        parsedNumber += ".";
+      }
+    } else {
+      break;
+    }
+
+    currentPosition++;
+  }
+
+  // parsedNumber can be empty in the only case where we have only seen
+  // 0s (one or more), so normalize it to a single 0.
+  if (parsedNumber.empty()) {
+    parsedNumber = "0";
+  }
+
+  // Note that parsedNumber can finish by a dot (1., 2., 0.). This is
+  // valid in most languages so we allow this.
+
+  auto number = gd::make_unique<NumberNode>(parsedNumber);
+  if (!numberHasStarted || !digitFound) {
+    number->diagnostic = RaiseSyntaxError(
+        _("A number was expected. You must enter a number here."));
+  }
+
+  return number;
+}
+
+}  // namespace gd

Core/GDCore/Events/Parsers/ExpressionParser2.h

@@ -0,0 +1,763 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#ifndef GDCORE_EXPRESSIONPARSER2_H
+#define GDCORE_EXPRESSIONPARSER2_H
+
+#include <memory>
+#include <utility>
+#include <vector>
+#include "ExpressionParser2Node.h"
+#include "GDCore/Extensions/Metadata/ExpressionMetadata.h"
+#include "GDCore/Extensions/Metadata/MetadataProvider.h"
+#include "GDCore/Project/Layout.h"  // For GetTypeOfObject and GetTypeOfBehavior
+#include "GDCore/String.h"
+#include "GDCore/Tools/Localization.h"
+#include "GDCore/Tools/MakeUnique.h"
+namespace gd {
+class Expression;
+class ObjectsContainer;
+class Platform;
+class ParameterMetadata;
+class ExpressionMetadata;
+}  // namespace gd
+
+namespace gd {
+
+/** \brief Parse an expression, returning a tree of node corresponding
+ * to the parsed expression.
+ *
+ * This is a LL(1) parser. This could be extracted to a generic/reusable
+ * parser by refactoring out the dependency on gd::MetadataProvider (injecting
+ * instead functions to be called to query supported functions).
+ *
+ * \see gd::ExpressionParserDiagnostic
+ * \see gd::ExpressionNode
+ */
+class GD_CORE_API ExpressionParser2 {
+ public:
+  ExpressionParser2(const gd::Platform &platform_,
+                    const gd::ObjectsContainer &globalObjectsContainer_,
+                    const gd::ObjectsContainer &objectsContainer_);
+  virtual ~ExpressionParser2(){};
+
+  /**
+   * Parse the given expression with the specified type.
+   *
+   * \param type Type of the expression: "string", "number",
+   * type supported by gd::ParameterMetadata::IsObject, types supported by
+   * gd::ParameterMetadata::IsExpression or "unknown". \param expression The
+   * expression to parse \param objectName Specify the object name, only for the
+   * case of "objectvar" type.
+   *
+   * \return The node representing the expression as a parsed tree.
+   */
+  std::unique_ptr<ExpressionNode> ParseExpression(
+      const gd::String &type,
+      const gd::String &expression_,
+      const gd::String &objectName = "") {
+    expression = expression_;
+
+    currentPosition = 0;
+    return Start(type, objectName);
+  }
+
+ private:
+  /** \name Grammar
+   * Each method is a part of the grammar.
+   */
+  ///@{
+  std::unique_ptr<ExpressionNode> Start(const gd::String &type,
+                                        const gd::String &objectName = "") {
+    auto expression = Expression(type, objectName);
+
+    // Check for extra characters at the end of the expression
+    if (!IsEndReached()) {
+      auto op = gd::make_unique<OperatorNode>();
+      op->op = ' ';
+      op->leftHandSide = std::move(expression);
+      op->rightHandSide = ReadUntilEnd("unknown");
+
+      op->rightHandSide->diagnostic = RaiseSyntaxError(
+          _("The expression has extra character at the end that should be "
+            "removed (or completed if your expression is not finished)."));
+      return std::move(op);
+    }
+
+    return expression;
+  }
+
+  std::unique_ptr<ExpressionNode> Expression(
+      const gd::String &type, const gd::String &objectName = "") {
+    SkipWhitespace();
+
+    size_t expressionStartPosition = GetCurrentPosition();
+    std::unique_ptr<ExpressionNode> leftHandSide = Term(type, objectName);
+
+    SkipWhitespace();
+
+    if (IsEndReached()) return leftHandSide;
+    if (IsAnyChar(",)]")) return leftHandSide;
+    if (IsAnyChar(EXPRESSION_OPERATORS)) {
+      auto op = gd::make_unique<OperatorNode>();
+      op->op = GetCurrentChar();
+      op->leftHandSide = std::move(leftHandSide);
+      op->diagnostic = ValidateOperator(type, GetCurrentChar());
+      SkipChar();
+      op->rightHandSide = Expression(type, objectName);
+      return std::move(op);
+    }
+
+    if (type == "string") {
+      leftHandSide->diagnostic = RaiseSyntaxError(
+          "You must add the operator + between texts or expressions. For "
+          "example: \"Your name: \" + VariableString(PlayerName).");
+    } else if (type == "number") {
+      leftHandSide->diagnostic = RaiseSyntaxError(
+          "No operator found. Did you forget to enter an operator (like +, -, "
+          "* or /) between numbers or expressions?");
+    } else {
+      leftHandSide->diagnostic = RaiseSyntaxError(
+          "More than one term was found. Verify that your expression is "
+          "properly written.");
+    }
+
+    auto op = gd::make_unique<OperatorNode>();
+    op->op = ' ';
+    op->leftHandSide = std::move(leftHandSide);
+    op->rightHandSide = Expression(type, objectName);
+    return std::move(op);
+  }
+
+  std::unique_ptr<ExpressionNode> Term(const gd::String &type,
+                                       const gd::String &objectName) {
+    SkipWhitespace();
+
+    std::unique_ptr<ExpressionNode> factor = Factor(type, objectName);
+    SkipWhitespace();
+
+    // This while loop is used instead of a recursion (like in Expression)
+    // to guarantee the proper operator precedence. (Expression could also
+    // be reworked to use a while loop).
+    while (IsAnyChar(TERM_OPERATORS)) {
+      auto op = gd::make_unique<OperatorNode>();
+      op->op = GetCurrentChar();
+      op->leftHandSide = std::move(factor);
+      op->diagnostic = ValidateOperator(type, GetCurrentChar());
+      SkipChar();
+      op->rightHandSide = Factor(type, objectName);
+      SkipWhitespace();
+
+      factor = std::move(op);
+    }
+
+    return factor;
+  };
+
+  std::unique_ptr<ExpressionNode> Factor(const gd::String &type,
+                                         const gd::String &objectName) {
+    SkipWhitespace();
+
+    size_t expressionStartPosition = GetCurrentPosition();
+    std::unique_ptr<ExpressionNode> factor;
+
+    if (IsAnyChar(QUOTE)) {
+      factor = ReadText();
+      if (type == "number")
+        factor->diagnostic =
+            RaiseTypeError(_("You entered a text, but a number was expected."),
+                           expressionStartPosition);
+      else if (type != "string")
+        factor->diagnostic = RaiseTypeError(
+            _("You entered a text, but this type was expected:") + type,
+            expressionStartPosition);
+    } else if (IsAnyChar(UNARY_OPERATORS)) {
+      auto unaryOperator = gd::make_unique<UnaryOperatorNode>(GetCurrentChar());
+      unaryOperator->diagnostic = ValidateUnaryOperator(type, GetCurrentChar());
+      SkipChar();
+      unaryOperator->factor = Factor(type, objectName);
+
+      factor = std::move(unaryOperator);
+    } else if (IsAnyChar(NUMBER_FIRST_CHAR)) {
+      factor = ReadNumber();
+      if (type == "string")
+        factor->diagnostic = RaiseTypeError(
+            _("You entered a number, but a text was expected (in quotes)."),
+            expressionStartPosition);
+      else if (type != "number")
+        factor->diagnostic = RaiseTypeError(
+            _("You entered a number, but this type was expected:") + type,
+            expressionStartPosition);
+    } else if (IsAnyChar("(")) {
+      SkipChar();
+      factor = SubExpression(type, objectName);
+
+      if (!IsAnyChar(")")) {
+        factor->diagnostic =
+            RaiseSyntaxError(_("Missing a closing parenthesis. Add a closing "
+                               "parenthesis for each opening parenthesis."));
+      }
+      SkipIfIsAnyChar(")");
+    } else if (IsIdentifierAllowedChar()) {
+      // This is a place where the grammar differs according to the
+      // type being expected.
+      if (gd::ParameterMetadata::IsExpression("variable", type)) {
+        factor = Variable(type, objectName);
+      } else {
+        factor = Identifier(type);
+      }
+    } else {
+      factor = ReadUntilWhitespace(type);
+      factor->diagnostic = RaiseEmptyError(type, expressionStartPosition);
+    }
+
+    return factor;
+  }
+
+  std::unique_ptr<SubExpressionNode> SubExpression(
+      const gd::String &type, const gd::String &objectName) {
+    return std::move(
+        gd::make_unique<SubExpressionNode>(Expression(type, objectName)));
+  };
+
+  std::unique_ptr<IdentifierOrFunctionOrEmptyNode> Identifier(
+      const gd::String &type) {
+    size_t identifierStartPosition = GetCurrentPosition();
+    gd::String name = ReadIdentifierName();
+
+    SkipWhitespace();
+
+    if (IsNamespaceSeparator()) {
+      SkipNamespaceSeparator();
+
+      name += NAMESPACE_SEPARATOR;
+      name += ReadIdentifierName();
+    }
+
+    if (IsAnyChar("(")) {
+      SkipChar();
+      return FreeFunction(type, name, identifierStartPosition);
+    } else if (IsAnyChar(DOT)) {
+      SkipChar();
+      return ObjectFunctionOrBehaviorFunction(
+          type, name, identifierStartPosition);
+    } else {
+      auto identifier = gd::make_unique<IdentifierNode>(name, type);
+      if (type == "string") {
+        identifier->diagnostic =
+            RaiseTypeError(_("You must wrap your text inside double quotes "
+                             "(example: \"Hello world\")."),
+                           identifierStartPosition);
+      } else if (type == "number") {
+        identifier->diagnostic = RaiseTypeError(_("You must enter a number."),
+                                                identifierStartPosition);
+      } else if (!gd::ParameterMetadata::IsObject(type)) {
+        identifier->diagnostic = RaiseTypeError(
+            _("You've entered a name, but this type was expected:") + type,
+            identifierStartPosition);
+      }
+
+      return std::move(identifier);
+    }
+  }
+
+  std::unique_ptr<VariableNode> Variable(const gd::String &type,
+                                         const gd::String &objectName) {
+    size_t identifierStartPosition = GetCurrentPosition();
+
+    gd::String name = ReadIdentifierName();
+    auto variable = gd::make_unique<VariableNode>(type, name, objectName);
+    variable->child = VariableAccessorOrVariableBracketAccessor();
+
+    return std::move(variable);
+  }
+
+  std::unique_ptr<VariableAccessorOrVariableBracketAccessorNode>
+  VariableAccessorOrVariableBracketAccessor() {
+    std::unique_ptr<VariableAccessorOrVariableBracketAccessorNode> child;
+    SkipWhitespace();
+    if (IsAnyChar("[")) {
+      SkipChar();
+      child =
+          gd::make_unique<VariableBracketAccessorNode>(Expression("string"));
+
+      if (!IsAnyChar("]")) {
+        child->diagnostic =
+            RaiseSyntaxError(_("Missing a closing bracket. Add a closing "
+                               "bracket for each opening bracket."));
+      }
+      SkipIfIsAnyChar("]");
+      child->child = VariableAccessorOrVariableBracketAccessor();
+    } else if (IsAnyChar(DOT)) {
+      SkipChar();
+      SkipWhitespace();
+
+      child = gd::make_unique<VariableAccessorNode>(ReadIdentifierName());
+      child->child = VariableAccessorOrVariableBracketAccessor();
+    }
+
+    return child;
+  }
+
+  std::unique_ptr<FunctionNode> FreeFunction(const gd::String &type,
+                                             const gd::String &functionFullName,
+                                             size_t functionStartPosition) {
+    // TODO: error if trying to use function for type != "number" && != "string"
+    // + Test for it
+
+    // This could be improved to have the type passed to a single
+    // GetExpressionMetadata function.
+    const gd::ExpressionMetadata &metadata =
+        type == "number" ? MetadataProvider::GetExpressionMetadata(
+                               platform, functionFullName)
+                         : MetadataProvider::GetStrExpressionMetadata(
+                               platform, functionFullName);
+
+    auto parametersAndError = Parameters(metadata.parameters);
+    auto function = gd::make_unique<FunctionNode>(
+        type, std::move(parametersAndError.first), metadata, functionFullName);
+    function->diagnostic = std::move(parametersAndError.second);
+    if (!function->diagnostic)
+      function->diagnostic = ValidateFunction(*function, functionStartPosition);
+
+    return std::move(function);
+  }
+
+  std::unique_ptr<FunctionOrEmptyNode> ObjectFunctionOrBehaviorFunction(
+      const gd::String &type,
+      const gd::String &objectName,
+      size_t functionStartPosition) {
+    gd::String objectFunctionOrBehaviorName = ReadIdentifierName();
+
+    SkipWhitespace();
+
+    if (IsNamespaceSeparator()) {
+      SkipNamespaceSeparator();
+      return BehaviorFunction(type,
+                              objectName,
+                              objectFunctionOrBehaviorName,
+                              functionStartPosition);
+    } else if (IsAnyChar("(")) {
+      SkipChar();
+
+      gd::String objectType =
+          GetTypeOfObject(globalObjectsContainer, objectsContainer, objectName);
+
+      // This could be improved to have the type passed to a single
+      // GetExpressionMetadata function.
+      const gd::ExpressionMetadata &metadata =
+          type == "number"
+              ? MetadataProvider::GetObjectExpressionMetadata(
+                    platform, objectType, objectFunctionOrBehaviorName)
+              : MetadataProvider::GetObjectStrExpressionMetadata(
+                    platform, objectType, objectFunctionOrBehaviorName);
+
+      auto parametersAndError = Parameters(metadata.parameters, objectName);
+      auto function =
+          gd::make_unique<FunctionNode>(type,
+                                        objectName,
+                                        std::move(parametersAndError.first),
+                                        metadata,
+                                        objectFunctionOrBehaviorName);
+      function->diagnostic = std::move(parametersAndError.second);
+      if (!function->diagnostic)
+        function->diagnostic =
+            ValidateFunction(*function, functionStartPosition);
+
+      return std::move(function);
+    }
+
+    auto node = gd::make_unique<EmptyNode>(type);
+    node->diagnostic = RaiseSyntaxError(
+        _("An opening parenthesis (for an object expression), or double colon "
+          "(::) was expected (for a behavior expression)."));
+
+    return std::move(node);
+  }
+
+  std::unique_ptr<FunctionOrEmptyNode> BehaviorFunction(
+      const gd::String &type,
+      const gd::String &objectName,
+      const gd::String &behaviorName,
+      size_t functionStartPosition) {
+    gd::String functionName = ReadIdentifierName();
+
+    SkipWhitespace();
+
+    if (IsAnyChar("(")) {
+      SkipChar();
+
+      gd::String behaviorType = GetTypeOfBehavior(
+          globalObjectsContainer, objectsContainer, behaviorName);
+
+      // This could be improved to have the type passed to a single
+      // GetExpressionMetadata function.
+      const gd::ExpressionMetadata &metadata =
+          type == "number" ? MetadataProvider::GetBehaviorExpressionMetadata(
+                                 platform, behaviorType, functionName)
+                           : MetadataProvider::GetBehaviorStrExpressionMetadata(
+                                 platform, behaviorType, functionName);
+
+      auto parametersAndError =
+          Parameters(metadata.parameters, objectName, behaviorName);
+      auto function =
+          gd::make_unique<FunctionNode>(type,
+                                        objectName,
+                                        behaviorName,
+                                        std::move(parametersAndError.first),
+                                        metadata,
+                                        functionName);
+      function->diagnostic = std::move(parametersAndError.second);
+      if (!function->diagnostic)
+        function->diagnostic =
+            ValidateFunction(*function, functionStartPosition);
+
+      return std::move(function);
+    } else {
+      auto node = gd::make_unique<EmptyNode>(type);
+      node->diagnostic = RaiseSyntaxError(
+          _("An opening parenthesis was expected here to call a function."));
+
+      return std::move(node);
+    }
+  }
+
+  std::pair<std::vector<std::unique_ptr<ExpressionNode>>,
+            std::unique_ptr<gd::ExpressionParserError>>
+  Parameters(std::vector<gd::ParameterMetadata> parameterMetadata,
+             const gd::String &objectName = "",
+             const gd::String &behaviorName = "") {
+    std::vector<std::unique_ptr<ExpressionNode>> parameters;
+
+    // By convention, object is always the first parameter, and behavior the
+    // second one.
+    size_t parameterIndex =
+        WrittenParametersFirstIndex(objectName, behaviorName);
+
+    while (!IsEndReached()) {
+      SkipWhitespace();
+
+      if (IsAnyChar(")")) {
+        SkipChar();
+        return std::make_pair(std::move(parameters), nullptr);
+      } else {
+        if (parameterIndex < parameterMetadata.size()) {
+          const gd::String &type = parameterMetadata[parameterIndex].GetType();
+          if (parameterMetadata[parameterIndex].IsCodeOnly()) {
+            // Do nothing, code only parameters are not written in expressions.
+          } else if (gd::ParameterMetadata::IsExpression("number", type)) {
+            parameters.push_back(Expression("number"));
+          } else if (gd::ParameterMetadata::IsExpression("string", type)) {
+            parameters.push_back(Expression("string"));
+          } else if (gd::ParameterMetadata::IsExpression("variable", type)) {
+            parameters.push_back(Expression(type, objectName));
+          } else if (gd::ParameterMetadata::IsObject(type)) {
+            parameters.push_back(Expression(type));
+          } else {
+            size_t parameterStartPosition = GetCurrentPosition();
+            parameters.push_back(Expression("unknown"));
+            parameters.back()->diagnostic =
+                gd::make_unique<ExpressionParserError>(
+                    "unknown_parameter_type",
+                    _("This function is improperly set up. Reach out to the "
+                      "extension developer or a GDevelop maintainer to fix "
+                      "this issue"),
+                    parameterStartPosition,
+                    GetCurrentPosition());
+          }
+        } else {
+          size_t parameterStartPosition = GetCurrentPosition();
+          parameters.push_back(Expression("unknown"));
+          parameters.back()
+              ->diagnostic = gd::make_unique<ExpressionParserError>(
+              "extra_parameter",
+              _("This parameter was not expected by this expression. Remove it "
+                "or verify that you've entered the proper expression name."),
+              parameterStartPosition,
+              GetCurrentPosition());
+        }
+
+        SkipWhitespace();
+        SkipIfIsAnyChar(PARAMETERS_SEPARATOR);
+        parameterIndex++;
+      }
+    }
+
+    return std::make_pair(
+        std::move(parameters),
+        RaiseSyntaxError(_("The list of parameters is not terminated. Add a "
+                           "closing parenthesis to end the parameters.")));
+  }
+  ///@}
+
+  /** \name Validators
+   * Return a diagnostic if any error is found
+   */
+  ///@{
+  std::unique_ptr<ExpressionParserDiagnostic> ValidateFunction(
+      const gd::FunctionNode &function, size_t functionStartPosition);
+
+  std::unique_ptr<ExpressionParserDiagnostic> ValidateOperator(
+      const gd::String &type, gd::String::value_type operatorChar) {
+    if (type == "number") {
+      if (operatorChar == '+' || operatorChar == '-' || operatorChar == '/' ||
+          operatorChar == '*') {
+        return gd::make_unique<ExpressionParserDiagnostic>();
+      }
+
+      return gd::make_unique<ExpressionParserError>(
+          "invalid_operator",
+          _("You've used an operator that is not supported. Operator should be "
+            "either +, -, / or *."),
+          GetCurrentPosition());
+    } else if (type == "string") {
+      if (operatorChar == '+') {
+        return gd::make_unique<ExpressionParserDiagnostic>();
+      }
+
+      return gd::make_unique<ExpressionParserError>(
+          "invalid_operator",
+          _("You've used an operator that is not supported. Only + can be used "
+            "to concatenate texts."),
+          GetCurrentPosition());
+    } else if (gd::ParameterMetadata::IsObject(type)) {
+      return gd::make_unique<ExpressionParserError>(
+          "invalid_operator",
+          _("Operators (+, -, /, *) can't be used with an object name. Remove the operator."),
+          GetCurrentPosition());
+    } else if (gd::ParameterMetadata::IsExpression("variable", type)) {
+      return gd::make_unique<ExpressionParserError>(
+          "invalid_operator",
+          _("Operators (+, -, /, *) can't be used in variable names. Remove "
+            "the operator from the variable name."),
+          GetCurrentPosition());
+    }
+
+    return gd::make_unique<ExpressionParserDiagnostic>();
+  }
+
+  std::unique_ptr<ExpressionParserDiagnostic> ValidateUnaryOperator(
+      const gd::String &type, gd::String::value_type operatorChar) {
+    if (type == "number") {
+      if (operatorChar == '+' || operatorChar == '-') {
+        return gd::make_unique<ExpressionParserDiagnostic>();
+      }
+
+      return gd::make_unique<ExpressionParserError>(
+          "invalid_operator",
+          _("You've used an \"unary\" operator that is not supported. Operator "
+            "should be "
+            "either + or -."),
+          GetCurrentPosition());
+    } else if (type == "string") {
+      return gd::make_unique<ExpressionParserError>(
+          "invalid_operator",
+          _("You've used an operator that is not supported. Only + can be used "
+            "to concatenate texts, and must be placed between two texts (or "
+            "expressions)."),
+          GetCurrentPosition());
+    } else if (gd::ParameterMetadata::IsObject(type)) {
+      return gd::make_unique<ExpressionParserError>(
+          "invalid_operator",
+          _("Operators (+, -) can't be used with an object name. Remove the operator."),
+          GetCurrentPosition());
+    } else if (gd::ParameterMetadata::IsExpression("variable", type)) {
+      return gd::make_unique<ExpressionParserError>(
+          "invalid_operator",
+          _("Operators (+, -) can't be used in variable names. Remove "
+            "the operator from the variable name."),
+          GetCurrentPosition());
+    }
+
+    return gd::make_unique<ExpressionParserDiagnostic>();
+  }
+  ///@}
+
+  /** \name Parsing tokens
+   * Read tokens or characters
+   */
+  ///@{
+  void SkipChar() { currentPosition++; }
+
+  void SkipWhitespace() {
+    while (currentPosition < expression.size() &&
+           WHITESPACES.find(expression[currentPosition]) != gd::String::npos) {
+      currentPosition++;
+    }
+  }
+
+  void SkipIfIsAnyChar(const gd::String &allowedCharacters) {
+    if (IsAnyChar(allowedCharacters)) {
+      currentPosition++;
+    }
+  }
+
+  void SkipNamespaceSeparator() {
+    // Namespace separator is a special kind of delimiter as it is 2 characters
+    // long
+    if (IsNamespaceSeparator()) {
+      currentPosition += NAMESPACE_SEPARATOR.size();
+    }
+  }
+
+  bool IsAnyChar(const gd::String &allowedCharacters) {
+    if (currentPosition < expression.size() &&
+        allowedCharacters.find(expression[currentPosition]) !=
+            gd::String::npos) {
+      return true;
+    }
+
+    return false;
+  }
+
+  bool IsIdentifierAllowedChar() {
+    if (currentPosition < expression.size() &&
+        PARAMETERS_SEPARATOR.find(expression[currentPosition]) ==
+            gd::String::npos &&
+        DOT.find(expression[currentPosition]) == gd::String::npos &&
+        QUOTE.find(expression[currentPosition]) == gd::String::npos &&
+        BRACKETS.find(expression[currentPosition]) == gd::String::npos &&
+        EXPRESSION_OPERATORS.find(expression[currentPosition]) ==
+            gd::String::npos &&
+        TERM_OPERATORS.find(expression[currentPosition]) == gd::String::npos) {
+      return true;
+    }
+
+    return false;
+  }
+
+  bool IsNamespaceSeparator() {
+    // Namespace separator is a special kind of delimiter as it is 2 characters
+    // long
+    return (currentPosition + NAMESPACE_SEPARATOR.size() <= expression.size() &&
+            expression.substr(currentPosition, NAMESPACE_SEPARATOR.size()) ==
+                NAMESPACE_SEPARATOR);
+  }
+
+  bool IsEndReached() { return currentPosition >= expression.size(); }
+
+  gd::String ReadIdentifierName() {
+    gd::String name;
+    while (currentPosition < expression.size() &&
+           (IsIdentifierAllowedChar()
+            // Allow whitespace in identifier name for compatibility
+            || expression[currentPosition] == ' ')) {
+      name += expression[currentPosition];
+      currentPosition++;
+    }
+
+    // Trim whitespace at the end (we allow them for compatibility inside
+    // the name, but after the last character that is not whitespace, they
+    // should be ignore again).
+    size_t lastCharacterPos = name.find_last_not_of(WHITESPACES);
+    if (!name.empty() && (lastCharacterPos + 1) < name.size()) {
+      name.erase(lastCharacterPos + 1);
+    }
+
+    return name;
+  }
+
+  std::unique_ptr<TextNode> ReadText();
+
+  std::unique_ptr<NumberNode> ReadNumber();
+
+  std::unique_ptr<EmptyNode> ReadUntilWhitespace(gd::String type) {
+    gd::String text;
+    while (currentPosition < expression.size() &&
+           WHITESPACES.find(expression[currentPosition]) == gd::String::npos) {
+      text += expression[currentPosition];
+      currentPosition++;
+    }
+
+    return gd::make_unique<EmptyNode>(type, text);
+  }
+
+  std::unique_ptr<EmptyNode> ReadUntilEnd(gd::String type) {
+    gd::String text;
+    while (currentPosition < expression.size()) {
+      text += expression[currentPosition];
+      currentPosition++;
+    }
+
+    return gd::make_unique<EmptyNode>(type, text);
+  }
+
+  size_t GetCurrentPosition() { return currentPosition; }
+
+  gd::String::value_type GetCurrentChar() {
+    if (currentPosition < expression.size()) {
+      return expression[currentPosition];
+    }
+
+    return '\n';  // Should not arise, unless GetCurrentChar was called when
+                  // IsEndReached() is true (which is a logical error).
+  }
+  ///@}
+
+  /** \name Raising errors
+   * Helpers to attach errors to nodes
+   */
+  ///@{
+  std::unique_ptr<ExpressionParserError> RaiseSyntaxError(
+      const gd::String &message) {
+    return std::move(gd::make_unique<ExpressionParserError>(
+        "syntax_error", message, GetCurrentPosition()));
+  }
+
+  std::unique_ptr<ExpressionParserError> RaiseTypeError(
+      const gd::String &message, size_t beginningPosition) {
+    return std::move(gd::make_unique<ExpressionParserError>(
+        "type_error", message, beginningPosition, GetCurrentPosition()));
+  }
+
+  std::unique_ptr<ExpressionParserError> RaiseEmptyError(
+      const gd::String &type, size_t beginningPosition) {
+    gd::String message;
+    if (type == "number") {
+      message = _("You must enter a number or a valid expression call.");
+    } else if (type == "string") {
+      message = _(
+          "You must enter a text (between quotes) or a valid expression call.");
+    } else if (gd::ParameterMetadata::IsExpression("variable", type)) {
+      message = _("You must enter a variable name.");
+    } else if (gd::ParameterMetadata::IsObject(type)) {
+      message = _("You must enter a valid object name.");
+    } else {
+      message = _("You must enter a valid expression.");
+    }
+
+    return std::move(RaiseTypeError(message, beginningPosition));
+  }
+  ///@}
+
+  static size_t WrittenParametersFirstIndex(const gd::String &objectName,
+                                            const gd::String &behaviorName) {
+    // By convention, object is always the first parameter, and behavior the
+    // second one.
+    return !behaviorName.empty() ? 2 : (!objectName.empty() ? 1 : 0);
+  }
+
+  gd::String expression;
+  std::size_t currentPosition;
+
+  const gd::Platform &platform;
+  const gd::ObjectsContainer &globalObjectsContainer;
+  const gd::ObjectsContainer &objectsContainer;
+
+  static gd::String NUMBER_FIRST_CHAR;
+  static gd::String DOT;
+  static gd::String PARAMETERS_SEPARATOR;
+  static gd::String QUOTE;
+  static gd::String BRACKETS;
+  static gd::String EXPRESSION_OPERATORS;
+  static gd::String TERM_OPERATORS;
+  static gd::String UNARY_OPERATORS;
+  static gd::String WHITESPACES;
+  static gd::String NAMESPACE_SEPARATOR;
+};
+
+}  // namespace gd
+
+#endif  // GDCORE_EXPRESSIONPARSER2_H

Core/GDCore/Events/Parsers/ExpressionParser2Node.cpp

@@ -0,0 +1,10 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#include "ExpressionParser2Node.h"
+
+namespace gd {
+gd::String ExpressionParserDiagnostic::noMessage = "";
+}

Core/GDCore/Events/Parsers/ExpressionParser2Node.h

@@ -0,0 +1,294 @@
+/*
+ * GDevelop Core
+ * Copyright 2008-present Florian Rival (Florian.Rival@gmail.com). All rights
+ * reserved. This project is released under the MIT License.
+ */
+#ifndef GDCORE_EXPRESSIONPARSER2NODES_H
+#define GDCORE_EXPRESSIONPARSER2NODES_H
+
+#include <memory>
+#include <vector>
+#include "ExpressionParser2NodeWorker.h"
+#include "GDCore/String.h"
+namespace gd {
+class Expression;
+class ObjectsContainer;
+class Platform;
+class ParameterMetadata;
+class ExpressionMetadata;
+}  // namespace gd
+
+namespace gd {
+
+/**
+ * \brief A diagnostic that can be attached to a gd::ExpressionNode.
+ */
+struct ExpressionParserDiagnostic {
+  virtual bool IsError() { return false; }
+  virtual const gd::String &GetMessage() { return noMessage; }
+  virtual size_t GetStartPosition() { return 0; }
+  virtual size_t GetEndPosition() { return 0; }
+
+ private:
+  static gd::String noMessage;
+};
+
+/**
+ * \brief An error that can be attached to a gd::ExpressionNode.
+ */
+struct ExpressionParserError : public ExpressionParserDiagnostic {
+  ExpressionParserError(const gd::String &type_,
+                        const gd::String &message_,
+                        size_t position_)
+      : type(type_),
+        message(message_),
+        startPosition(position_),
+        endPosition(position_){};
+  ExpressionParserError(const gd::String &type_,
+                        const gd::String &message_,
+                        size_t startPosition_,
+                        size_t endPosition_)
+      : type(type_),
+        message(message_),
+        startPosition(startPosition_),
+        endPosition(endPosition_){};
+  virtual ~ExpressionParserError(){};
+
+  bool IsError() override { return true; }
+  const gd::String &GetMessage() override { return message; }
+  size_t GetStartPosition() override { return startPosition; }
+  size_t GetEndPosition() override { return endPosition; }
+
+ private:
+  gd::String type;
+  gd::String message;
+  size_t startPosition;
+  size_t endPosition;
+};
+
+/**
+ * \brief The base node, from which all nodes in the tree of
+ * an expression inherits from.
+ */
+struct ExpressionNode {
+  virtual ~ExpressionNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker){};
+
+  std::unique_ptr<ExpressionParserDiagnostic> diagnostic;
+};
+
+struct SubExpressionNode : public ExpressionNode {
+  SubExpressionNode(std::unique_ptr<ExpressionNode> expression_)
+      : expression(std::move(expression_)){};
+  virtual ~SubExpressionNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitSubExpressionNode(*this);
+  };
+
+  std::unique_ptr<ExpressionNode> expression;
+};
+
+/**
+ * \brief An operator node. For example: "lhs + rhs".
+ */
+struct OperatorNode : public ExpressionNode {
+  virtual ~OperatorNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitOperatorNode(*this);
+  };
+
+  std::unique_ptr<ExpressionNode> leftHandSide;
+  std::unique_ptr<ExpressionNode> rightHandSide;
+  gd::String::value_type op;
+};
+
+/**
+ * \brief A unary operator node. For example: "-2".
+ */
+struct UnaryOperatorNode : public ExpressionNode {
+  UnaryOperatorNode(gd::String::value_type op_) : op(op_){};
+  virtual ~UnaryOperatorNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitUnaryOperatorNode(*this);
+  };
+
+  std::unique_ptr<ExpressionNode> factor;
+  gd::String::value_type op;
+};
+
+/**
+ * \brief A number node. For example: "123".
+ */
+struct NumberNode : public ExpressionNode {
+  NumberNode(const gd::String &number_) : number(number_){};
+  virtual ~NumberNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitNumberNode(*this);
+  };
+
+  gd::String number;
+};
+
+/**
+ * \brief A text node. For example: "Hello World".
+ */
+struct TextNode : public ExpressionNode {
+  TextNode(const gd::String &text_) : text(text_){};
+  virtual ~TextNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitTextNode(*this);
+  };
+
+  gd::String text;
+};
+
+struct VariableAccessorOrVariableBracketAccessorNode : public ExpressionNode {
+  std::unique_ptr<VariableAccessorOrVariableBracketAccessorNode> child;
+};
+
+/**
+ * \brief A variable, potentially with accessor to its children.
+ *
+ * Example: MyVariable or MyVariable.MyChildren
+ *
+ * \see gd::VariableAccessorNode
+ * \see gd::VariableBracketAccessorNode
+ */
+struct VariableNode : public ExpressionNode {
+  VariableNode(const gd::String &type_,
+               const gd::String &name_,
+               const gd::String &objectName_)
+      : type(type_), name(name_), objectName(objectName_){};
+  virtual ~VariableNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitVariableNode(*this);
+  };
+
+  gd::String type;
+  gd::String name;
+  gd::String objectName;
+
+  std::unique_ptr<VariableAccessorOrVariableBracketAccessorNode>
+      child;  // Can be nullptr if no accessor
+};
+
+/**
+ * \brief A bracket accessor of a variable. Example: MyChild
+ * in MyVariable.MyChild
+ */
+struct VariableAccessorNode
+    : public VariableAccessorOrVariableBracketAccessorNode {
+  VariableAccessorNode(const gd::String &name_) : name(name_){};
+  virtual ~VariableAccessorNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitVariableAccessorNode(*this);
+  };
+
+  gd::String name;
+};
+
+/**
+ * \brief A bracket accessor of a variable. Example: ["MyChild"]
+ * (in MyVariable["MyChild"]).
+ */
+struct VariableBracketAccessorNode
+    : public VariableAccessorOrVariableBracketAccessorNode {
+  VariableBracketAccessorNode(std::unique_ptr<ExpressionNode> expression_)
+      : expression(std::move(expression_)){};
+  virtual ~VariableBracketAccessorNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitVariableBracketAccessorNode(*this);
+  };
+
+  std::unique_ptr<ExpressionNode> expression;
+};
+
+struct IdentifierOrFunctionOrEmptyNode : public ExpressionNode {};
+
+/**
+ * \brief An identifier node, usually representing an object.
+ */
+struct IdentifierNode : public IdentifierOrFunctionOrEmptyNode {
+  IdentifierNode(const gd::String &identifierName_, const gd::String &type_)
+      : identifierName(identifierName_), type(type_){};
+  virtual ~IdentifierNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitIdentifierNode(*this);
+  };
+
+  gd::String identifierName;
+  gd::String type;
+};
+
+struct FunctionOrEmptyNode : public IdentifierOrFunctionOrEmptyNode {
+  virtual ~FunctionOrEmptyNode(){};
+  void Visit(ExpressionParser2NodeWorker &worker) override{};
+};
+
+/**
+ * \brief A function node. For example: "MyExtension::MyFunction(1, 2)".
+ */
+struct FunctionNode : public FunctionOrEmptyNode {
+  FunctionNode(const gd::String &type_,
+               std::vector<std::unique_ptr<ExpressionNode>> parameters_,
+               const ExpressionMetadata &expressionMetadata_,
+               const gd::String &functionName_)
+      : type(type_),
+        parameters(std::move(parameters_)),
+        expressionMetadata(expressionMetadata_),
+        functionName(functionName_){};
+  FunctionNode(const gd::String &type_,
+               const gd::String &objectName_,
+               std::vector<std::unique_ptr<ExpressionNode>> parameters_,
+               const ExpressionMetadata &expressionMetadata_,
+               const gd::String &functionName_)
+      : type(type_),
+        objectName(objectName_),
+        parameters(std::move(parameters_)),
+        expressionMetadata(expressionMetadata_),
+        functionName(functionName_){};
+  FunctionNode(const gd::String &type_,
+               const gd::String &objectName_,
+               const gd::String &behaviorName_,
+               std::vector<std::unique_ptr<ExpressionNode>> parameters_,
+               const ExpressionMetadata &expressionMetadata_,
+               const gd::String &functionName_)
+      : type(type_),
+        objectName(objectName_),
+        behaviorName(behaviorName_),
+        parameters(std::move(parameters_)),
+        expressionMetadata(expressionMetadata_),
+        functionName(functionName_){};
+  virtual ~FunctionNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitFunctionNode(*this);
+  };
+
+  gd::String type;  // This could be removed if the type ("string" or "number")
+                    // was stored in ExpressionMetadata.
+  gd::String objectName;
+  gd::String behaviorName;
+  std::vector<std::unique_ptr<ExpressionNode>> parameters;
+  const ExpressionMetadata &expressionMetadata;
+  gd::String functionName;
+};
+
+/**
+ * \brief An empty node, used when parsing failed/a syntax error was
+ * encountered and any other node could not make sense.
+ */
+struct EmptyNode : public FunctionOrEmptyNode {
+  EmptyNode(const gd::String &type_, const gd::String &text_ = "")
+      : type(type_), text(text_){};
+  virtual ~EmptyNode(){};
+  virtual void Visit(ExpressionParser2NodeWorker &worker) {
+    worker.OnVisitEmptyNode(*this);
+  };
+
+  gd::String type;
+  gd::String text;
+};
+
+}  // namespace gd
+
+#endif