mirror of https://github.com/icsharpcode/ILSpy.git
117 lines
4.5 KiB
117 lines
4.5 KiB
// |
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// ExtractAnonymousMethodAction.cs |
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// |
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// Author: |
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// Mansheng Yang <lightyang0@gmail.com> |
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// |
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// Copyright (c) 2012 Mansheng Yang <lightyang0@gmail.com> |
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// |
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// Permission is hereby granted, free of charge, to any person obtaining a copy |
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// of this software and associated documentation files (the "Software"), to deal |
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// in the Software without restriction, including without limitation the rights |
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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// copies of the Software, and to permit persons to whom the Software is |
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// furnished to do so, subject to the following conditions: |
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// |
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// The above copyright notice and this permission notice shall be included in |
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// all copies or substantial portions of the Software. |
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// |
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
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// THE SOFTWARE. |
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using System.Collections.Generic; |
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using System.Linq; |
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using ICSharpCode.NRefactory.CSharp.Resolver; |
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namespace ICSharpCode.NRefactory.CSharp.Refactoring |
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{ |
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[ContextAction ("Extract anonymous method", |
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Description = "Extract anonymous method to method of the containing type")] |
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public class ExtractAnonymousMethodAction : ICodeActionProvider |
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{ |
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public IEnumerable<CodeAction> GetActions (RefactoringContext context) |
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{ |
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// lambda |
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var lambda = context.GetNode<LambdaExpression> (); |
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if (lambda != null && lambda.ArrowToken.Contains(context.Location)) { |
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if (ContainsLocalReferences (context, lambda, lambda.Body)) |
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yield break; |
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bool noReturn = false; |
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BlockStatement body; |
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if (lambda.Body is BlockStatement) { |
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body = (BlockStatement)lambda.Body.Clone (); |
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} else { |
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body = new BlockStatement (); |
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var type = LambdaHelper.GetLambdaReturnType (context, lambda); |
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if (type == null || type.ReflectionName == "System.Void") { |
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noReturn = true; |
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body.Add (new ExpressionStatement ((Expression)lambda.Body.Clone ())); |
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} else { |
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body.Add (new ReturnStatement ((Expression)lambda.Body.Clone ())); |
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} |
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} |
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var method = GetMethod (context, (LambdaResolveResult)context.Resolve (lambda), body, noReturn); |
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yield return GetAction (context, lambda, method); |
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} |
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// anonymous method |
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var anonymousMethod = context.GetNode<AnonymousMethodExpression> (); |
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if (anonymousMethod != null && anonymousMethod.DelegateToken.Contains(context.Location)) { |
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if (ContainsLocalReferences (context, anonymousMethod, anonymousMethod.Body)) |
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yield break; |
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var method = GetMethod (context, (LambdaResolveResult)context.Resolve (anonymousMethod), |
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(BlockStatement)anonymousMethod.Body.Clone ()); |
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yield return GetAction (context, anonymousMethod, method); |
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} |
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} |
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CodeAction GetAction (RefactoringContext context, AstNode node, MethodDeclaration method) |
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{ |
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return new CodeAction (context.TranslateString ("Extract anonymous method"), |
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script => |
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{ |
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var identifier = new IdentifierExpression ("Method"); |
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script.Replace (node, identifier); |
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script.InsertBefore (node.GetParent<EntityDeclaration> (), method); |
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script.Link (method.NameToken, identifier); |
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}); |
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} |
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static MethodDeclaration GetMethod (RefactoringContext context, LambdaResolveResult lambda, BlockStatement body, |
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bool noReturnValue = false) |
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{ |
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var method = new MethodDeclaration { Name = "Method" }; |
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if (noReturnValue) { |
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method.ReturnType = new PrimitiveType ("void"); |
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} else { |
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var type = lambda.GetInferredReturnType (lambda.Parameters.Select (p => p.Type).ToArray ()); |
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method.ReturnType = type.Name == "?" ? new PrimitiveType ("void") : context.CreateShortType (type); |
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} |
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foreach (var param in lambda.Parameters) |
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method.Parameters.Add (new ParameterDeclaration (context.CreateShortType (param.Type), param.Name)); |
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method.Body = body; |
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if (lambda.IsAsync) |
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method.Modifiers |= Modifiers.Async; |
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return method; |
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} |
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static bool ContainsLocalReferences (RefactoringContext context, AstNode expr, AstNode body) |
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{ |
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var visitor = new ExtractMethod.VariableLookupVisitor (context); |
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body.AcceptVisitor (visitor); |
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return visitor.UsedVariables.Any (variable => !expr.Contains (variable.Region.Begin)); |
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} |
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} |
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}
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