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C#: Add source generator for signals as events

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Changed the signal declaration signal to:

```
// The following generates a MySignal event
[Signal] public delegate void MySignalEventHandler(int param);
```
This commit is contained in:
Ignacio Roldán Etcheverry
2022-07-28 17:41:47 +02:00
parent f033764ffe
commit 97713ff77a
31 changed files with 997 additions and 523 deletions
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115
modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ScriptMemberInvokerGenerator.cs
View File

@@ -1,3 +1,4 @@
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.CodeAnalysis;
@@ -122,6 +123,33 @@ namespace Godot.SourceGenerators
var godotClassProperties = propertySymbols.WhereIsGodotCompatibleType(typeCache).ToArray();
var godotClassFields = fieldSymbols.WhereIsGodotCompatibleType(typeCache).ToArray();
var signalDelegateSymbols = members
.Where(s => s.Kind == SymbolKind.NamedType)
.Cast<INamedTypeSymbol>()
.Where(namedTypeSymbol => namedTypeSymbol.TypeKind == TypeKind.Delegate)
.Where(s => s.GetAttributes()
.Any(a => a.AttributeClass?.IsGodotSignalAttribute() ?? false));
List<GodotSignalDelegateData> godotSignalDelegates = new();
foreach (var signalDelegateSymbol in signalDelegateSymbols)
{
if (!signalDelegateSymbol.Name.EndsWith(ScriptSignalsGenerator.SignalDelegateSuffix))
continue;
string signalName = signalDelegateSymbol.Name;
signalName = signalName.Substring(0,
signalName.Length - ScriptSignalsGenerator.SignalDelegateSuffix.Length);
var invokeMethodData = signalDelegateSymbol
.DelegateInvokeMethod?.HasGodotCompatibleSignature(typeCache);
if (invokeMethodData == null)
continue;
godotSignalDelegates.Add(new(signalName, signalDelegateSymbol, invokeMethodData.Value));
}
source.Append(" private partial class GodotInternal {\n");
// Generate cached StringNames for methods and properties, for fast lookup
@@ -157,6 +185,42 @@ namespace Godot.SourceGenerators
source.Append(" }\n");
}
// Generate HasGodotClassMethod
if (godotClassMethods.Length > 0)
{
source.Append(" protected override bool HasGodotClassMethod(in godot_string_name method)\n {\n");
bool isFirstEntry = true;
foreach (var method in godotClassMethods)
{
GenerateHasMethodEntry(method, source, isFirstEntry);
isFirstEntry = false;
}
source.Append(" return base.HasGodotClassMethod(method);\n");
source.Append(" }\n");
}
// Generate RaiseGodotClassSignalCallbacks
if (godotSignalDelegates.Count > 0)
{
source.Append(
" protected override void RaiseGodotClassSignalCallbacks(in godot_string_name signal, ");
source.Append("NativeVariantPtrArgs args, int argCount)\n {\n");
foreach (var signal in godotSignalDelegates)
{
GenerateSignalEventInvoker(signal, source);
}
source.Append(" base.RaiseGodotClassSignalCallbacks(signal, args, argCount);\n");
source.Append(" }\n");
}
// Generate Set/GetGodotClassPropertyValue
if (godotClassProperties.Length > 0 || godotClassFields.Length > 0)
@@ -224,24 +288,6 @@ namespace Godot.SourceGenerators
source.Append(" }\n");
}
// Generate HasGodotClassMethod
if (godotClassMethods.Length > 0)
{
source.Append(" protected override bool HasGodotClassMethod(in godot_string_name method)\n {\n");
bool isFirstEntry = true;
foreach (var method in godotClassMethods)
{
GenerateHasMethodEntry(method, source, isFirstEntry);
isFirstEntry = false;
}
source.Append(" return base.HasGodotClassMethod(method);\n");
source.Append(" }\n");
}
source.Append("}\n"); // partial class
if (isInnerClass)
@@ -314,6 +360,39 @@ namespace Godot.SourceGenerators
source.Append(" }\n");
}
private static void GenerateSignalEventInvoker(
GodotSignalDelegateData signal,
StringBuilder source
)
{
string signalName = signal.Name;
var invokeMethodData = signal.InvokeMethodData;
source.Append(" if (signal == GodotInternal.SignalName_");
source.Append(signalName);
source.Append(" && argCount == ");
source.Append(invokeMethodData.ParamTypes.Length);
source.Append(") {\n");
source.Append(" backing_");
source.Append(signalName);
source.Append("?.Invoke(");
for (int i = 0; i < invokeMethodData.ParamTypes.Length; i++)
{
if (i != 0)
source.Append(", ");
source.AppendVariantToManagedExpr(string.Concat("args[", i.ToString(), "]"),
invokeMethodData.ParamTypeSymbols[i], invokeMethodData.ParamTypes[i]);
}
source.Append(");\n");
source.Append(" return;\n");
source.Append(" }\n");
}
private static void GeneratePropertySetter(
string propertyMemberName,
ITypeSymbol propertyTypeSymbol,