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//
// ExtractAnonymousMethodAction.cs
//
// Author:
// Mansheng Yang <lightyang0@gmail.com>
//
// Copyright (c) 2012 Mansheng Yang <lightyang0@gmail.com>
//
// 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.Collections.Generic;
using System.Linq;
using ICSharpCode.NRefactory.CSharp.Resolver;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction ("Extract anonymous method",
Description = "Extract anonymous method to method of the containing type")]
public class ExtractAnonymousMethodAction : ICodeActionProvider
{
public IEnumerable<CodeAction> GetActions (RefactoringContext context)
{
// lambda
var lambda = context.GetNode<LambdaExpression> ();
if (lambda != null && lambda.ArrowToken.Contains(context.Location)) {
if (ContainsLocalReferences (context, lambda, lambda.Body))
yield break;
bool noReturn = false;
BlockStatement body;
if (lambda.Body is BlockStatement) {
body = (BlockStatement)lambda.Body.Clone ();
} else {
body = new BlockStatement ();
var type = LambdaHelper.GetLambdaReturnType (context, lambda);
if (type == null || type.ReflectionName == "System.Void") {
noReturn = true;
body.Add (new ExpressionStatement ((Expression)lambda.Body.Clone ()));
} else {
body.Add (new ReturnStatement ((Expression)lambda.Body.Clone ()));
}
}
var method = GetMethod (context, (LambdaResolveResult)context.Resolve (lambda), body, noReturn);
yield return GetAction (context, lambda, method);
}
// anonymous method
var anonymousMethod = context.GetNode<AnonymousMethodExpression> ();
if (anonymousMethod != null && anonymousMethod.DelegateToken.Contains(context.Location)) {
if (ContainsLocalReferences (context, anonymousMethod, anonymousMethod.Body))
yield break;
var method = GetMethod (context, (LambdaResolveResult)context.Resolve (anonymousMethod),
(BlockStatement)anonymousMethod.Body.Clone ());
yield return GetAction (context, anonymousMethod, method);
}
}
CodeAction GetAction (RefactoringContext context, AstNode node, MethodDeclaration method)
{
return new CodeAction (context.TranslateString ("Extract anonymous method"),
script =>
{
var identifier = new IdentifierExpression ("Method");
script.Replace (node, identifier);
script.InsertBefore (node.GetParent<EntityDeclaration> (), method);
script.Link (method.NameToken, identifier);
}, method.NameToken);
}
static MethodDeclaration GetMethod (RefactoringContext context, LambdaResolveResult lambda, BlockStatement body,
bool noReturnValue = false)
{
var method = new MethodDeclaration { Name = "Method" };
if (noReturnValue) {
method.ReturnType = new PrimitiveType ("void");
} else {
var type = lambda.GetInferredReturnType (lambda.Parameters.Select (p => p.Type).ToArray ());
method.ReturnType = type.Name == "?" ? new PrimitiveType ("void") : context.CreateShortType (type);
}
foreach (var param in lambda.Parameters)
method.Parameters.Add (new ParameterDeclaration (context.CreateShortType (param.Type), param.Name));
method.Body = body;
if (lambda.IsAsync)
method.Modifiers |= Modifiers.Async;
return method;
}
static bool ContainsLocalReferences (RefactoringContext context, AstNode expr, AstNode body)
{
var visitor = new ExtractMethod.VariableLookupVisitor (context);
body.AcceptVisitor (visitor);
return visitor.UsedVariables.Any (variable => !expr.Contains (variable.Region.Begin));
}
}
}
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