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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices.JavaScript;
using Microsoft.CodeAnalysis.CSharp;
using Microsoft.CodeAnalysis.CSharp.Syntax;
using static Microsoft.CodeAnalysis.CSharp.SyntaxFactory;
namespace Microsoft.Interop.JavaScript
{
internal sealed class FuncJSGenerator : BaseJSGenerator
{
private readonly bool _isAction;
private readonly MarshalerType[] _argumentMarshalerTypes;
public FuncJSGenerator(TypePositionInfo info, StubCodeContext context, bool isAction, MarshalerType[] argumentMarshalerTypes)
: base(isAction ? MarshalerType.Action : MarshalerType.Function, new Forwarder().Bind(info, context))
{
_isAction = isAction;
_argumentMarshalerTypes = argumentMarshalerTypes;
}
public override IEnumerable<ExpressionSyntax> GenerateBind()
{
var args = _argumentMarshalerTypes.Select(x => Argument(MarshalerTypeName(x))).ToList();
yield return InvocationExpression(MarshalerTypeName(Type), ArgumentList(SeparatedList(args)));
}
public override IEnumerable<StatementSyntax> Generate(StubIdentifierContext context)
{
string argName = context.GetAdditionalIdentifier(TypeInfo, "js_arg");
var target = TypeInfo.IsManagedReturnPosition
? Constants.ArgumentReturn
: argName;
var source = TypeInfo.IsManagedReturnPosition
? Argument(IdentifierName(context.GetIdentifiers(TypeInfo).native))
: _inner.AsArgument(context);
var jsty = (JSFunctionTypeInfo)((JSMarshallingInfo)TypeInfo.MarshallingAttributeInfo).TypeInfo;
var sourceTypes = jsty.ArgsTypeInfo
.Select(a => a.Syntax)
.ToArray();
if (context.CurrentStage == StubIdentifierContext.Stage.UnmarshalCapture && CodeContext.Direction == MarshalDirection.ManagedToUnmanaged && TypeInfo.IsManagedReturnPosition)
{
yield return ToManagedMethod(target, source, jsty);
}
if (context.CurrentStage == StubIdentifierContext.Stage.Marshal && CodeContext.Direction == MarshalDirection.UnmanagedToManaged && TypeInfo.IsManagedReturnPosition)
{
yield return ToJSMethod(target, source, jsty);
}
foreach (var x in base.Generate(context))
{
yield return x;
}
if (context.CurrentStage == StubIdentifierContext.Stage.PinnedMarshal && CodeContext.Direction == MarshalDirection.ManagedToUnmanaged && !TypeInfo.IsManagedReturnPosition)
{
yield return ToJSMethod(target, source, jsty);
}
if (context.CurrentStage == StubIdentifierContext.Stage.Unmarshal && CodeContext.Direction == MarshalDirection.UnmanagedToManaged && !TypeInfo.IsManagedReturnPosition)
{
yield return ToManagedMethod(target, source, jsty);
}
}
private ExpressionStatementSyntax ToManagedMethod(string target, ArgumentSyntax source, JSFunctionTypeInfo info)
{
List<ArgumentSyntax> arguments = [source.WithRefOrOutKeyword(Token(SyntaxKind.OutKeyword))];
for (int i = 0; i < info.ArgsTypeInfo.Length; i++)
{
var sourceType = info.ArgsTypeInfo[i];
if (!_isAction && i + 1 == info.ArgsTypeInfo.Length)
{
arguments.Add(ArgToManaged(i, sourceType.Syntax, _argumentMarshalerTypes[i]));
}
else
{
arguments.Add(ArgToJS(i, sourceType.Syntax, _argumentMarshalerTypes[i]));
}
}
return ExpressionStatement(InvocationExpression(MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression,
IdentifierName(target), GetToManagedMethod(Type)))
.WithArgumentList(ArgumentList(SeparatedList(arguments))));
}
private ExpressionStatementSyntax ToJSMethod(string target, ArgumentSyntax source, JSFunctionTypeInfo info)
{
List<ArgumentSyntax> arguments = [source];
for (int i = 0; i < info.ArgsTypeInfo.Length; i++)
{
var sourceType = info.ArgsTypeInfo[i];
if (!_isAction && i + 1 == info.ArgsTypeInfo.Length)
{
arguments.Add(ArgToJS(i, sourceType.Syntax, _argumentMarshalerTypes[i]));
}
else
{
arguments.Add(ArgToManaged(i, sourceType.Syntax, _argumentMarshalerTypes[i]));
}
}
return ExpressionStatement(InvocationExpression(MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression,
IdentifierName(target), GetToJSMethod(Type)))
.WithArgumentList(ArgumentList(SeparatedList(arguments))));
}
private static ArgumentSyntax ArgToJS(int i, TypeSyntax sourceType, MarshalerType marshalerType) => Argument(ParenthesizedLambdaExpression()
.WithModifiers(TokenList(Token(SyntaxKind.StaticKeyword)))
.WithParameterList(ParameterList(SeparatedList(new[]{
Parameter(Identifier("__delegate_arg_arg"+(i+1)))
.WithModifiers(TokenList(Token(SyntaxKind.RefKeyword)))
.WithType(IdentifierName(Constants.JSMarshalerArgumentGlobal)),
Parameter(Identifier("__delegate_arg"+(i+1)))
.WithType(sourceType)})))
.WithBlock(Block(SingletonList<StatementSyntax>(ExpressionStatement(
InvocationExpression(MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression,
IdentifierName("__delegate_arg_arg" + (i + 1)), GetToJSMethod(marshalerType)))
.WithArgumentList(ArgumentList(SeparatedList(new[]{
Argument(IdentifierName("__delegate_arg"+(i+1))),
}))))))));
private static ArgumentSyntax ArgToManaged(int i, TypeSyntax sourceType, MarshalerType marshalerType) => Argument(ParenthesizedLambdaExpression()
.WithModifiers(TokenList(Token(SyntaxKind.StaticKeyword)))
.WithParameterList(ParameterList(SeparatedList(new[]{
Parameter(Identifier("__delegate_arg_arg"+(i+1)))
.WithModifiers(TokenList(Token(SyntaxKind.RefKeyword)))
.WithType(IdentifierName(Constants.JSMarshalerArgumentGlobal)),
Parameter(Identifier("__delegate_arg"+(i+1)))
.WithModifiers(TokenList(Token(SyntaxKind.OutKeyword)))
.WithType(sourceType)})))
.WithBlock(Block(SingletonList<StatementSyntax>(ExpressionStatement(
InvocationExpression(MemberAccessExpression(SyntaxKind.SimpleMemberAccessExpression,
IdentifierName("__delegate_arg_arg" + (i + 1)), GetToManagedMethod(marshalerType)))
.WithArgumentList(ArgumentList(SeparatedList(new[]{
Argument(IdentifierName("__delegate_arg"+(i+1))).WithRefOrOutKeyword(Token(SyntaxKind.OutKeyword)),
}))))))));
}
}
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