public override SyntaxNode VisitParenthesizedLambdaExpression(ParenthesizedLambdaExpressionSyntax node)
{
node = (ParenthesizedLambdaExpressionSyntax)base.VisitParenthesizedLambdaExpression(node);
if (transformKind == TransformKind.LambdaToAnonMethod)
{
// If any of the lambda parameters do not have type explicitly specified then we don't do any transforms.
foreach (var parameter in node.ParameterList.Parameters)
{
if (parameter.Type == null)
{
return(node);
}
}
// If the body of the lambda is not a block syntax we don't do any transforms.
if (node.Body.Kind() != SyntaxKind.Block)
{
return(node);
}
return(SyntaxFactory.AnonymousMethodExpression(
default(SyntaxToken),
SyntaxFactory.Token(SyntaxKind.DelegateKeyword),
node.ParameterList,
(BlockSyntax)node.Body));
}
return(node);
}
private static SyntaxNode ConvertAnonymousMethodToAsync(AnonymousMethodExpressionSyntax anonymousMethod)
{
return(SyntaxFactory.AnonymousMethodExpression(
SyntaxFactory.Token(SyntaxKind.AsyncKeyword),
anonymousMethod.DelegateKeyword,
anonymousMethod.ParameterList,
anonymousMethod.Block)
.WithTriviaFrom(anonymousMethod)
.WithAdditionalAnnotations(Formatter.Annotation));
}
public override SyntaxNode MakeSyntaxNode()
{
var res = SyntaxFactory.AnonymousMethodExpression(AsyncKeyword, DelegateKeyword, ParameterList, Body);
if (Block != null)
{
res = res.WithBlock(Block);
}
IsChanged = false;
return(res);
}
public override async Task ComputeRefactoringsAsync(CodeRefactoringContext context)
{
var document = context.Document;
if (document.Project.Solution.Workspace.Kind == WorkspaceKind.MiscellaneousFiles)
{
return;
}
var span = context.Span;
if (!span.IsEmpty)
{
return;
}
var cancellationToken = context.CancellationToken;
if (cancellationToken.IsCancellationRequested)
{
return;
}
var model = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
if (model.IsFromGeneratedCode(cancellationToken))
{
return;
}
var root = await model.SyntaxTree.GetRootAsync(cancellationToken).ConfigureAwait(false);
var token = root.FindToken(span.Start);
if (!token.IsKind(SyntaxKind.EqualsGreaterThanToken))
{
return;
}
var node = token.Parent;
if (!node.IsKind(SyntaxKind.ParenthesizedLambdaExpression) && !node.IsKind(SyntaxKind.SimpleLambdaExpression))
{
return;
}
context.RegisterRefactoring(
CodeActionFactory.Create(
token.Span,
DiagnosticSeverity.Info,
GettextCatalog.GetString("To anonymous method"),
t2 =>
{
var parameters = new List <ParameterSyntax>();
CSharpSyntaxNode bodyExpr;
if (node.IsKind(SyntaxKind.ParenthesizedLambdaExpression))
{
var ple = (ParenthesizedLambdaExpressionSyntax)node;
parameters.AddRange(ConvertParameters(model, node, ple.ParameterList.Parameters));
bodyExpr = ple.Body;
}
else
{
var sle = ((SimpleLambdaExpressionSyntax)node);
parameters.AddRange(ConvertParameters(model, node, new[] { sle.Parameter }));
bodyExpr = sle.Body;
}
if (ConvertLambdaBodyExpressionToStatementCodeRefactoringProvider.RequireReturnStatement(model, node))
{
bodyExpr = SyntaxFactory.Block(SyntaxFactory.ReturnStatement(bodyExpr as ExpressionSyntax));
}
var ame = SyntaxFactory.AnonymousMethodExpression(
parameters.Count == 0 ? null : SyntaxFactory.ParameterList(SyntaxFactory.SeparatedList(parameters)),
bodyExpr as BlockSyntax ?? SyntaxFactory.Block(SyntaxFactory.ExpressionStatement(bodyExpr as ExpressionSyntax))
);
var newRoot = root.ReplaceNode((SyntaxNode)node, ame.WithAdditionalAnnotations(Formatter.Annotation));
return(Task.FromResult(document.WithSyntaxRoot(newRoot)));
}
)
);
}
public override async Task ComputeRefactoringsAsync(CodeRefactoringContext context)
{
var document = context.Document;
if (document.Project.Solution.Workspace.Kind == WorkspaceKind.MiscellaneousFiles)
{
return;
}
var span = context.Span;
if (!span.IsEmpty)
{
return;
}
var cancellationToken = context.CancellationToken;
if (cancellationToken.IsCancellationRequested)
{
return;
}
var model = await document.GetSemanticModelAsync(cancellationToken).ConfigureAwait(false);
if (model.IsFromGeneratedCode(cancellationToken))
{
return;
}
var root = await model.SyntaxTree.GetRootAsync(cancellationToken).ConfigureAwait(false);
var node = root.FindNode(span);
if (!node.IsKind(SyntaxKind.IdentifierName))
{
return;
}
if (node.Parent.IsKind(SyntaxKind.SimpleMemberAccessExpression))
{
node = node.Parent;
}
var info = model.GetTypeInfo(node, cancellationToken);
var type = info.ConvertedType ?? info.Type;
if (type == null)
{
return;
}
var invocationMethod = type.GetDelegateInvokeMethod();
if (invocationMethod == null)
{
return;
}
context.RegisterRefactoring(
CodeActionFactory.Create(
node.Span,
DiagnosticSeverity.Info,
GettextCatalog.GetString("To anonymous method"),
t2 =>
{
var expr = SyntaxFactory.InvocationExpression(
(ExpressionSyntax)node,
SyntaxFactory.ArgumentList(SyntaxFactory.SeparatedList(invocationMethod.Parameters.Select(p => SyntaxFactory.Argument(SyntaxFactory.IdentifierName(p.Name)))))
);
var parameters = invocationMethod.Parameters.Select(p => CreateParameterSyntax(model, node, p)).ToList();
var stmt = invocationMethod.ReturnType.SpecialType == SpecialType.System_Void ? (StatementSyntax)SyntaxFactory.ExpressionStatement(expr) : SyntaxFactory.ReturnStatement(expr);
var ame = SyntaxFactory.AnonymousMethodExpression(
parameters.Count == 0 ? null : SyntaxFactory.ParameterList(SyntaxFactory.SeparatedList(parameters)),
SyntaxFactory.Block(stmt)
);
var newRoot = root.ReplaceNode((SyntaxNode)node, ame.WithAdditionalAnnotations(Formatter.Annotation));
return(Task.FromResult(document.WithSyntaxRoot(newRoot)));
}
)
);
}