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// InsertAnonymousMethodSignature.cs
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// Mike Krüger <mkrueger@novell.com>
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// Copyright (c) 2011 Mike Krüger <mkrueger@novell.com>
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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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// 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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// 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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using ICSharpCode.NRefactory.TypeSystem;
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using System.Threading;
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using System.Collections.Generic;
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namespace ICSharpCode.NRefactory.CSharp.Refactoring
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[ContextAction("Insert anonymous method signature", Description = "Inserts a signature to parameterless anonymous methods.")]
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public class InsertAnonymousMethodSignatureAction : ICodeActionProvider
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public IEnumerable<CodeAction> GetActions(RefactoringContext context)
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var anonymousMethodExpression = GetAnonymousMethodExpression(context, out type);
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if (anonymousMethodExpression == null) {
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yield return new CodeAction (context.TranslateString("Insert anonymous method signature"), script => {
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var delegateMethod = type.GetDelegateInvokeMethod();
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var sb = new StringBuilder ("(");
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for (int k = 0; k < delegateMethod.Parameters.Count; k++) {
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var paramType = delegateMethod.Parameters [k].Type;
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sb.Append(context.CreateShortType(paramType));
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sb.Append(delegateMethod.Parameters [k].Name);
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script.InsertText(context.GetOffset(anonymousMethodExpression.DelegateToken.EndLocation), sb.ToString());
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static AnonymousMethodExpression GetAnonymousMethodExpression (RefactoringContext context, out IType delegateType)
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var anonymousMethodExpression = context.GetNode<AnonymousMethodExpression> ();
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if (anonymousMethodExpression == null || !anonymousMethodExpression.DelegateToken.Contains (context.Location) || anonymousMethodExpression.HasParameterList)
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IType resolvedType = null;
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var parent = anonymousMethodExpression.Parent;
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if (parent is AssignmentExpression) {
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resolvedType = context.Resolve (((AssignmentExpression)parent).Left).Type;
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} else if (parent is VariableInitializer) {
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resolvedType = context.Resolve (((VariableDeclarationStatement)parent.Parent).Type).Type;
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} else if (parent is InvocationExpression) {
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// TODO: handle invocations
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if (resolvedType == null)
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delegateType = resolvedType;
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if (delegateType.Kind != TypeKind.Delegate)
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return anonymousMethodExpression;