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//
// ConvertLambdaToDelegateAction.cs
//
// Author:
// Simon Lindgren <simon.n.lindgren@gmail.com>
//
// Copyright (c) 2012 Simon Lindgren
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
using System;
using ICSharpCode.NRefactory.CSharp.Resolver;
using System.Collections.Generic;
using ICSharpCode.NRefactory.TypeSystem;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction("Convert lambda to anonymous delegate",
Description = "Converts a lambda to an anonymous delegate.")]
public class ConvertLambdaToAnonymousDelegateAction : SpecializedCodeAction<LambdaExpression>
{
#region implemented abstract members of SpecializedCodeAction
protected override CodeAction GetAction(RefactoringContext context, LambdaExpression node)
{
if (context.Location < node.StartLocation || context.Location >= node.Body.StartLocation)
return null;
var lambdaResolveResult = context.Resolve(node) as LambdaResolveResult;
if (lambdaResolveResult == null)
return null;
return new CodeAction(context.TranslateString("Convert to anonymous delegate"), script => {
BlockStatement newBody;
if (node.Body is BlockStatement) {
newBody = (BlockStatement)node.Body.Clone();
} else {
var expression = (Expression)node.Body.Clone();
Statement statement;
if (RequireReturnStatement(context, node)) {
statement = new ReturnStatement(expression);
}
else {
statement = new ExpressionStatement(expression);
}
newBody = new BlockStatement {
Statements = {
statement
}
};
}
var method = new AnonymousMethodExpression (newBody, GetParameters(lambdaResolveResult.Parameters, context));
script.Replace(node, method);
}, node);
}
#endregion
IEnumerable<ParameterDeclaration> GetParameters(IList<IParameter> parameters, RefactoringContext context)
{
if (parameters == null || parameters.Count == 0)
return null;
var result = new List<ParameterDeclaration> ();
foreach (var parameter in parameters) {
var type = context.CreateShortType(parameter.Type);
var name = parameter.Name;
ParameterModifier modifier = ParameterModifier.None;
if (parameter.IsRef)
modifier |= ParameterModifier.Ref;
if (parameter.IsOut)
modifier |= ParameterModifier.Out;
result.Add (new ParameterDeclaration(type, name, modifier));
}
return result;
}
static bool RequireReturnStatement (RefactoringContext context, LambdaExpression lambda)
{
var type = LambdaHelper.GetLambdaReturnType (context, lambda);
return type != null && type.ReflectionName != "System.Void";
}
}
}
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