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// Copyright Epic Games, Inc. All Rights Reserved.
using System;
using System.Collections.Concurrent;
using EpicGames.Core;
using EpicGames.UHT.Types;
using EpicGames.UHT.Utils;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using EpicGames.UHT.Tables;
using UnrealBuildTool;
namespace SourceCodeGeneratorUbtPlugin
{
[UnrealHeaderTool]
internal class SourceCodeGenerator
{
[UhtExporter(Name = "UnrealCSharp", Description = "UnrealCSharp Source Code Generator",
Options = UhtExporterOptions.Default, ModuleName = "UnrealCSharp")]
private static void SourceCodeGeneratorExporter(IUhtExportFactory factory)
{
var SettingFilePath = Path.Combine(new string(factory.Session.ProjectDirectory),
"Config",
"DefaultUnrealCSharpEditorSetting.ini");
if (File.Exists(SettingFilePath))
{
var SettingConfigFile = new ConfigFile(new FileReference(SettingFilePath));
if (SettingConfigFile.TryGetSection("/Script/UnrealCSharpCore.UnrealCSharpEditorSetting",
out var SettingConfigSection))
{
var SettingConfigHierarchySection = new ConfigHierarchySection(
new List<ConfigFileSection> { SettingConfigSection });
if (SettingConfigHierarchySection.TryGetValue("bEnableExport",
out var Value))
{
if (bool.Parse(Value.ToLower()))
{
new SourceCodeGenerator(factory).Generate();
}
}
}
}
}
private readonly IUhtExportFactory Factory;
private UhtSession Session => Factory.Session;
private ConcurrentQueue<UhtClass> ExportClasses = new();
private HashSet<string> Project = new();
private Dictionary<string, string> HeaderPath = new();
private const string BindingSuffix = ".binding.inl";
private const string HeaderSuffix = ".header.inl";
public SourceCodeGenerator(IUhtExportFactory factory)
{
Factory = factory;
}
/// <summary>
/// Export all the classes in all the packages
/// </summary>
private void Generate()
{
if (Session is { EngineDirectory: not null, ProjectDirectory: not null })
{
GetModules(Path.GetFullPath(Path.Combine(Session.ProjectDirectory, "Source/")), Project);
GetModules(Path.GetFullPath(Path.Combine(Session.ProjectDirectory, "Source/")), HeaderPath);
GetModules(Path.GetFullPath(Path.Combine(Session.ProjectDirectory, "Plugins/")), HeaderPath);
GetPlugins(Path.GetFullPath(Path.Combine(Session.ProjectDirectory, "Plugins/")), HeaderPath);
GetModules(Path.GetFullPath(Path.Combine(Session.EngineDirectory, "Source/Developer/")), HeaderPath);
GetModules(Path.GetFullPath(Path.Combine(Session.EngineDirectory, "Source/Editor/")), HeaderPath);
GetModules(Path.GetFullPath(Path.Combine(Session.EngineDirectory, "Source/Programs/")), HeaderPath);
GetModules(Path.GetFullPath(Path.Combine(Session.EngineDirectory, "Source/Runtime/")), HeaderPath);
GetModules(Path.GetFullPath(Path.Combine(Session.EngineDirectory, "Plugins/")), HeaderPath);
GetPlugins(Path.GetFullPath(Path.Combine(Session.EngineDirectory, "Plugins/")), HeaderPath);
}
var SettingFilePath = Path.Combine(new string(Session.ProjectDirectory),
"Config",
"DefaultUnrealCSharpEditorSetting.ini");
var ExportModule = new List<string>();
if (File.Exists(SettingFilePath))
{
var SettingConfigFile = new ConfigFile(new FileReference(SettingFilePath));
if (SettingConfigFile.TryGetSection("/Script/UnrealCSharpCore.UnrealCSharpEditorSetting",
out var SettingConfigSection))
{
var SettingConfigHierarchySection = new ConfigHierarchySection(
new List<ConfigFileSection> { SettingConfigSection });
if (SettingConfigHierarchySection.TryGetValues("ExportModule",
out var Values))
{
foreach (var value in Values)
{
ExportModule.Add(value);
}
}
}
}
List<Task?> tasks = new();
foreach (var module in Session.Modules)
{
if (module.Module.ModuleType != UHTModuleType.EngineRuntime &&
module.Module.ModuleType != UHTModuleType.GameRuntime)
{
continue;
}
if (ExportModule.All(x =>
string.Compare(x, module.Module.Name, StringComparison.OrdinalIgnoreCase) != 0))
{
continue;
}
QueueClassExports(module.ScriptPackage, tasks);
}
var waitTasks = tasks.Where(Task => Task != null).Cast<Task>().ToArray();
if (waitTasks.Length > 0)
{
Task.WaitAll(waitTasks);
}
Finish();
}
/// <summary>
/// Collect the classes to be exported for the given package and type
/// </summary>
/// <param name="type">Type to test for exporting</param>
/// <param name="tasks">Collection of queued tasks</param>
private void QueueClassExports(UhtType type, List<Task?> tasks)
{
if (type is UhtClass classObj)
{
if (CanExportClass(classObj))
{
tasks.Add(Factory.CreateTask(_ => { ExportClass(classObj); }));
}
}
foreach (var child in type.Children)
{
QueueClassExports(child, tasks);
}
}
/// <summary>
/// Test to see if the given class should be exported
/// </summary>
/// <param name="classObj">Class to test</param>
/// <returns>True if the class should be exported, false if not</returns>
protected virtual bool CanExportClass(UhtClass classObj)
{
return !classObj.ClassFlags.HasAnyFlags(EClassFlags.Interface) &&
IsClassTypeSupported(classObj);
}
/// <summary>
/// Test to see if the given function should be exported
/// </summary>
/// <param name="function">Function to test</param>
/// <returns>True if the function should be exported</returns>
protected virtual bool CanExportFunction(UhtFunction function)
{
if (function.Outer is UhtClass classObj)
{
if (!classObj.ClassFlags.HasAnyFlags(EClassFlags.RequiredAPI) &&
!function.FunctionExportFlags.HasAnyFlags(UhtFunctionExportFlags.RequiredAPI))
{
return false;
}
}
else
{
return false;
}
if (function.FunctionType != UhtFunctionType.Function)
{
return false;
}
if (!function.FunctionFlags.HasAnyFlags(EFunctionFlags.Public))
{
return false;
}
if (function.Deprecated)
{
return false;
}
if (function.FunctionFlags.HasAnyFlags(EFunctionFlags.EditorOnly))
{
return false;
}
if (function.FunctionExportFlags.HasAnyFlags(UhtFunctionExportFlags.CustomThunk))
{
return false;
}
if (function is { HasReturnProperty: true, ReturnProperty: UhtMapProperty })
{
return false;
}
foreach (var child in function.Children)
{
if (child is UhtProperty property && !IsPropertyTypeSupported(property))
{
return false;
}
}
return true;
}
/// <summary>
/// Test to see if the given property should be exported
/// </summary>
/// <param name="property">Property to test</param>
/// <returns>True if the property should be exported</returns>
protected virtual bool CanExportProperty(UhtProperty property)
{
return !property.Deprecated &&
!property.PropertyFlags.HasAnyFlags(EPropertyFlags.EditorOnly) &&
property.PropertyFlags.HasAnyFlags(EPropertyFlags.NativeAccessSpecifierPublic) &&
IsPropertyTypeSupported(property);
}
private static bool IsClassTypeSupported(UhtClass classObj)
{
return !classObj.Deprecated &&
(classObj == classObj.Session.UObject ||
classObj == classObj.Session.UClass ||
classObj.ClassFlags.HasAnyFlags(EClassFlags.RequiredAPI | EClassFlags.MinimalAPI));
}
private static bool IsPropertyTypeSupported(UhtProperty property)
{
if (property is UhtObjectProperty objectProperty)
{
if (!IsClassTypeSupported(objectProperty.Class))
{
return false;
}
}
if (property is UhtObjectPtrProperty objectPtrProperty)
{
if (!IsClassTypeSupported(objectPtrProperty.Class))
{
return false;
}
}
if (property is UhtInterfaceProperty interfaceProperty)
{
if (interfaceProperty.InterfaceClass == interfaceProperty.Session.IInterface)
{
return false;
}
}
if (property is UhtDelegateProperty or UhtMulticastDelegateProperty or UhtFieldPathProperty)
{
return false;
}
if (property is UhtStructProperty { ScriptStruct.HasNoOpConstructor: false })
{
return false;
}
if (property is UhtArrayProperty arrayProperty)
{
return IsPropertyTypeSupported(arrayProperty.ValueProperty);
}
if (property is UhtSetProperty setProperty)
{
return IsPropertyTypeSupported(setProperty.ValueProperty);
}
if (property is UhtMapProperty mapProperty)
{
return IsPropertyTypeSupported(mapProperty.KeyProperty) &&
IsPropertyTypeSupported(mapProperty.ValueProperty);
}
return property is { IsBitfield: false, IsStaticArray: false };
}
/// <summary>
/// Export the given class
/// </summary>
/// <param name="classObj">Class to export</param>
private void ExportClass(UhtClass classObj)
{
using BorrowStringBuilder borrower = new(StringBuilderCache.Big);
if (ExportClass(borrower.StringBuilder, classObj))
{
var fileName = Factory.MakePath(classObj.EngineName, BindingSuffix);
SaveIfChanged(fileName, borrower.StringBuilder);
ExportClasses.Enqueue(classObj);
}
}
private void Finish()
{
var packages = new Dictionary<UhtPackage, List<string>>();
foreach (var ExportClass in ExportClasses)
{
if (!packages.ContainsKey(ExportClass.Package))
{
packages.Add(ExportClass.Package, new List<string>());
}
packages[ExportClass.Package].AddUnique(ExportClass.EngineName);
}
foreach (var package in packages)
{
package.Value.Sort();
var borrow = new BorrowStringBuilder(StringBuilderCache.Big);
var builder = borrow.StringBuilder;
builder.Append("#pragma once\r\n\r\n");
foreach (var value in package.Value)
{
builder.Append(GenerateInclude($"{value}{BindingSuffix}"));
}
var fileName = Factory.MakePath(package.Key.Module, HeaderSuffix);
SaveIfChanged(fileName, builder);
}
}
private bool ExportClass(StringBuilder builder, UhtClass classObj)
{
builder.Append("#pragma once\r\n\r\n" +
"PRAGMA_DISABLE_DEPRECATION_WARNINGS\r\n\r\n");
var DependencyClasses = new HashSet<UhtClass> { classObj };
using BorrowStringBuilder bodyBorrower = new(StringBuilderCache.Big);
var bodyBuilder = bodyBorrower.StringBuilder;
bodyBuilder.AppendFormat("namespace\r\n" +
"{{\r\n" +
"\tstruct FRegister{0}\r\n" +
"\t{{\r\n" +
"\t\tFRegister{1}()\r\n" +
"\t\t{{\r\n" +
"\t\t\tTBindingClassBuilder<{2}>(NAMESPACE_BINDING)\r\n",
classObj.EngineName,
classObj.EngineName,
classObj.SourceName);
var bExportProperty = false;
foreach (var child in classObj.Children)
{
if (child is UhtProperty property && CanExportProperty(property))
{
GetDependencyClasses(property, DependencyClasses);
ExportProperty(bodyBuilder, classObj, property);
bExportProperty = true;
}
}
var bExportFunction = false;
foreach (var function in classObj.Functions.Reverse())
{
if (CanExportFunction(function))
{
foreach (var child in function.Children)
{
if (child is UhtProperty property)
{
GetDependencyClasses(property, DependencyClasses);
}
}
ExportFunction(bodyBuilder, classObj, function);
bExportFunction = true;
}
}
foreach (var DependencyClass in DependencyClasses)
{
builder.Append(GetInclude(DependencyClass));
}
builder.Append("\r\n");
bodyBuilder.Remove(bodyBuilder.Length - 2, 2);
bodyBuilder.AppendFormat(";\r\n" +
"\t\t}}\r\n" +
"\t}};\r\n" +
"\r\n" +
"\t[[maybe_unused]] FRegister{0} Register{1};\r\n" +
"}}\r\n\r\n",
classObj.EngineName,
classObj.EngineName);
builder.Append(bodyBuilder);
builder.Append("PRAGMA_ENABLE_DEPRECATION_WARNINGS\r\n");
return bExportProperty || bExportFunction;
}
private static void GetDependencyClasses(UhtProperty property, HashSet<UhtClass> DependencyClasses)
{
if (property is UhtClassProperty classProperty)
{
if (classProperty.MetaClass != null)
{
DependencyClasses.Add(classProperty.MetaClass);
}
}
else if (property is UhtObjectPtrProperty objectPtrProperty)
{
DependencyClasses.Add(objectPtrProperty.Class);
}
else if (property is UhtObjectProperty objectProperty)
{
DependencyClasses.Add(objectProperty.Class);
}
else if (property is UhtSoftClassProperty softClassProperty)
{
if (softClassProperty.MetaClass != null)
{
DependencyClasses.Add(softClassProperty.MetaClass);
}
}
else if (property is UhtSoftObjectProperty softObjectProperty)
{
DependencyClasses.Add(softObjectProperty.Class);
}
else if (property is UhtArrayProperty arrayProperty)
{
GetDependencyClasses(arrayProperty.ValueProperty, DependencyClasses);
}
else if (property is UhtSetProperty setProperty)
{
GetDependencyClasses(setProperty.ValueProperty, DependencyClasses);
}
else if (property is UhtMapProperty mapProperty)
{
GetDependencyClasses(mapProperty.KeyProperty, DependencyClasses);
GetDependencyClasses(mapProperty.ValueProperty, DependencyClasses);
}
}
private static void ExportFunction(StringBuilder builder, UhtClass classObj, UhtFunction function)
{
builder.Append(
$"\t\t\t\t.Function(\"{function.SourceName}\", BINDING_OVERLOAD({GetFunctionSignature(classObj, function)}, &{classObj.SourceName}::{function.SourceName}");
if (function.HasParameters)
{
builder.Append($", {GetFunctionParamName(function)}");
}
if (!function.FunctionFlags.HasAnyFlags(EFunctionFlags.Static))
{
builder.Append(", EFunctionInteract::Virtual");
}
if (function.HasParameters)
{
builder.Append(GetFunctionDefaultValue(function));
}
builder.Append("))\r\n");
}
private static void ExportProperty(StringBuilder builder, UhtClass classObj, UhtProperty property)
{
builder.Append(
$"\t\t\t\t.Property(\"{property.SourceName}\", BINDING_PROPERTY(&{classObj.SourceName}::{property.SourceName}))\r\n");
}
private static string GetParamPropertySignature(UhtProperty? property)
{
if (property == null)
{
return "void";
}
var builder = new StringBuilder();
var caps = property.PropertyCaps;
var isInterfaceProp = property is UhtInterfaceProperty;
var passCppArgsByRef = caps.HasAnyFlags(UhtPropertyCaps.PassCppArgsByRef);
var isConstParam = property.PropertyFlags.HasAnyFlags(EPropertyFlags.ConstParm) ||
(isInterfaceProp && !property.PropertyFlags.HasAnyFlags(EPropertyFlags.OutParm));
var isConstArgsByRef = property.ArrayDimensions == null && passCppArgsByRef &&
!property.PropertyFlags.HasAnyFlags(
EPropertyFlags.ConstParm | EPropertyFlags.OutParm);
var isOnConstClass = false;
if (property is UhtObjectProperty objectProperty)
{
isOnConstClass = objectProperty.Class.ClassFlags.HasAnyFlags(EClassFlags.Const) ||
objectProperty.MetaData.TryGetValue(UhtNames.NativeConst, out _);
}
var shouldHaveRef =
property.PropertyFlags.HasAnyFlags(EPropertyFlags.OutParm | EPropertyFlags.ReferenceParm);
var constAtTheBeginning = isOnConstClass || isConstArgsByRef || (isConstParam && !shouldHaveRef);
if (constAtTheBeginning)
{
builder.Append("const ");
}
if (property is UhtEnumProperty enumProperty)
{
builder.Append(enumProperty.Enum.CppType);
}
else
{
property.AppendText(builder, UhtPropertyTextType.ExportMember);
}
var fromConstClass = false;
if (property.Outer is UhtClass outerClass)
{
fromConstClass = outerClass.ClassFlags.HasAnyFlags(EClassFlags.Const);
}
var constAtTheEnd = (fromConstClass || (isConstParam && shouldHaveRef)) && !constAtTheBeginning;
if (constAtTheEnd)
{
builder.Append(" const");
}
shouldHaveRef = passCppArgsByRef;
if (shouldHaveRef ||
property.ArrayDimensions == null &&
(passCppArgsByRef ||
property.PropertyFlags.HasAnyFlags(EPropertyFlags.OutParm | EPropertyFlags.ReferenceParm)))
{
if (property is UhtArrayProperty or UhtStrProperty or UhtTextProperty or UhtInterfaceProperty
or UhtSoftObjectProperty)
{
if (property.RefQualifier != UhtPropertyRefQualifier.None)
{
builder.Append('&');
}
}
else
{
builder.Append('&');
}
}
return builder.ToString();
}
private static string GetReturnPropertySignature(UhtProperty? property)
{
if (property == null)
{
return "void";
}
var builder = new StringBuilder();
if (property.PropertyFlags.HasAnyFlags(EPropertyFlags.ConstParm) ||
property.RefQualifier == UhtPropertyRefQualifier.ConstRef)
{
builder.Append("const ");
}
if (property is UhtEnumProperty enumProperty)
{
builder.Append(enumProperty.Enum.CppType);
}
else
{
property.AppendText(builder, UhtPropertyTextType.ExportMember);
}
if (property.RefQualifier == UhtPropertyRefQualifier.ConstRef)
{
builder.Append('&');
}
return builder.ToString();
}
private static string GetFunctionSignature(UhtClass classObj, UhtFunction function)
{
var builder = new StringBuilder();
builder.Append(GetReturnPropertySignature(function.ReturnProperty));
if (function.FunctionFlags.HasAnyFlags(EFunctionFlags.Static))
{
builder.Append("(*)");
}
else
{
builder.Append($"({classObj.SourceName}::*)");
}
builder.Append('(');
foreach (var child in function.Children)
{
if (child is UhtProperty property)
{
if (!property.PropertyFlags.HasAnyFlags(EPropertyFlags.ReturnParm))
{
builder.Append(GetParamPropertySignature(property));
builder.Append(", ");
}
}
}
if (function.HasParameters)
{
builder.Remove(builder.Length - 2, 2);
}
builder.Append(')');
if (function.FunctionFlags.HasAnyFlags(EFunctionFlags.Const))
{
builder.Append("const");
}
return builder.ToString();
}
private static string GetFunctionParamName(UhtFunction function)
{
var builder = new StringBuilder();
builder.Append("TArray<FString>{");
foreach (var child in function.Children)
{
if (child is UhtProperty property)
{
if (!property.PropertyFlags.HasAnyFlags(EPropertyFlags.ReturnParm))
{
builder.Append($"\"{property.SourceName}\", ");
}
}
}
builder.Remove(builder.Length - 2, 2);
builder.Append('}');
return builder.ToString();
}
private static string GetFunctionDefaultValue(UhtFunction function)
{
if (!function.FunctionFlags.HasAnyFlags(EFunctionFlags.BlueprintCallable))
{
return "";
}
var builder = new StringBuilder();
foreach (var child in function.Children)
{
if (child is UhtProperty property)
{
if (!property.PropertyFlags.HasAnyFlags(EPropertyFlags.ReturnParm))
{
if (property.DefaultValueTokens != null)
{
builder.Append(", ");
var DefaultValue = new StringBuilder();
foreach (var ValueToken in property.DefaultValueTokens)
{
DefaultValue.Append(ValueToken.Value);
}
if (DefaultValue.ToString() == "NULL")
{
builder.Append("nullptr");
}
else
{
builder.Append(DefaultValue);
}
}
}
}
}
return builder.ToString();
}
private string GetHeaderFile(UhtClass classObj)
{
return Path.Combine(HeaderPath[classObj.Package.Module.ShortName], classObj.HeaderFile.FilePath);
}
private static string GenerateInclude(string file)
{
return $"#include \"{file}\"\r\n";
}
private string GetInclude(UhtClass classObj)
{
return GenerateInclude(GetHeaderFile(classObj));
}
private void SaveIfChanged(string file, StringBuilder builder)
{
if (File.Exists(file) && File.ReadAllText(file) == builder.ToString())
{
return;
}
Factory.CommitOutput(file, builder);
}
private void GetPlugins(string InPathName, Dictionary<string, string> Plugins)
{
var Suffix = "*.uplugin";
var DirectoryInfo = new DirectoryInfo(InPathName);
foreach (var Item in DirectoryInfo.GetFiles(Suffix))
{
if (Item.DirectoryName != null)
{
Plugins[Item.Name.Remove(Item.Name.Length - Suffix.Length + 1)] = Item.DirectoryName;
}
}
foreach (var Directories in DirectoryInfo.GetDirectories())
{
foreach (var Item in Directories.GetFiles(Suffix, SearchOption.AllDirectories))
{
if (Item.DirectoryName != null)
{
Plugins[Item.Name.Remove(Item.Name.Length - Suffix.Length + 1)] = Item.DirectoryName;
}
}
}
}
private void GetModules(string InPathName, Dictionary<string, string> Modules)
{
var Suffix = "*.Build.cs";
var DirectoryInfo = new DirectoryInfo(InPathName);
foreach (var Item in DirectoryInfo.GetFiles(Suffix))
{
if (Item.DirectoryName != null)
{
Modules[Item.Name.Remove(Item.Name.Length - Suffix.Length + 1)] = Item.DirectoryName;
}
}
foreach (var Directories in DirectoryInfo.GetDirectories())
{
foreach (var Item in Directories.GetFiles(Suffix, SearchOption.AllDirectories))
{
if (Item.DirectoryName != null)
{
Modules[Item.Name.Remove(Item.Name.Length - Suffix.Length + 1)] = Item.DirectoryName;
}
}
}
}
private void GetModules(string InPathName, HashSet<string> Modules)
{
var Suffix = "*.Build.cs";
var DirectoryInfo = new DirectoryInfo(InPathName);
foreach (var Item in DirectoryInfo.GetFiles(Suffix))
{
Modules.Add(Item.Name.Remove(Item.Name.Length - Suffix.Length + 1));
}
foreach (var Directories in DirectoryInfo.GetDirectories())
{
foreach (var Item in Directories.GetFiles(Suffix, SearchOption.AllDirectories))
{
if (Item.DirectoryName != null)
{
Modules.Add(Item.Name.Remove(Item.Name.Length - Suffix.Length + 1));
}
}
}
}
}
}
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