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Viewing changes to external/nrefactory/ICSharpCode.NRefactory.CSharp/Refactoring/CodeActions/CreateEventInvocatorAction.cs

  • Committer: Package Import Robot
  • Author(s): Jo Shields
  • Date: 2013-05-12 09:46:03 UTC
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20130512094603-mad323bzcxvmcam0
Tags: upstream-4.0.5+dfsg
Import upstream version 4.0.5+dfsg

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external/nrefactory/ICSharpCode.NRefactory.CSharp/Refactoring/CodeActions/CreateEventInvocatorAction.cs
 
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// 
 
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// CreateEventInvocator.cs
 
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//  
 
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// Author:
 
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//       Mike Krüger <mkrueger@novell.com>
 
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// 
 
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// Copyright (c) 2011 Mike Krüger <mkrueger@novell.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;
 
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using System.Linq;
 
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using System.Collections.Generic;
 
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using ICSharpCode.NRefactory.TypeSystem;
 
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namespace ICSharpCode.NRefactory.CSharp.Refactoring
 
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{
 
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        [ContextAction("Create event invocator", Description = "Creates a standard OnXXX event method.")]
 
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        public class CreateEventInvocatorAction : ICodeActionProvider
 
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        {
 
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                /// <summary>
 
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                /// If <c>true</c> an explicit type will be used for the handler variable; otherwise, 'var' will be used as type.
 
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                /// Default value is <c>false</c>
 
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                /// </summary>
 
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                public bool UseExplictType {
 
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                        get;
 
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                        set;
 
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                }
 
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                public static MethodDeclaration CreateEventInvocator (RefactoringContext context, TypeDeclaration declaringType, EventDeclaration eventDeclaration, VariableInitializer initializer, IMethod invokeMethod, bool useExplictType)
 
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                {
 
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                        bool hasSenderParam = false;
 
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                        IEnumerable<IParameter> pars = invokeMethod.Parameters;
 
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                        if (invokeMethod.Parameters.Any()) {
 
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                                var first = invokeMethod.Parameters [0];
 
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                                if (first.Name == "sender" /*&& first.Type == "System.Object"*/) {
 
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                                        hasSenderParam = true;
 
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                                        pars = invokeMethod.Parameters.Skip(1);
 
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                                }
 
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                        }
 
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                        const string handlerName = "handler";
 
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                        var arguments = new List<Expression>();
 
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                        if (hasSenderParam)
 
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                                arguments.Add(eventDeclaration.HasModifier (Modifiers.Static) ? (Expression)new PrimitiveExpression (null) : new ThisReferenceExpression());
 
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                        bool useThisMemberReference = false;
 
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                        foreach (var par in pars) {
 
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                                arguments.Add(new IdentifierExpression(par.Name));
 
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                                useThisMemberReference |= par.Name == initializer.Name;
 
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                        }
 
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                        var proposedHandlerName = GetNameProposal(initializer);
 
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                        var modifiers = eventDeclaration.HasModifier(Modifiers.Static) ? Modifiers.Static : Modifiers.Protected | Modifiers.Virtual;
 
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                        if (declaringType.HasModifier (Modifiers.Sealed)) {
 
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                                modifiers = Modifiers.None;
 
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                        }
 
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                        var methodDeclaration = new MethodDeclaration {
 
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                                Name = proposedHandlerName,
 
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                                ReturnType = new PrimitiveType ("void"),
 
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                                Modifiers = modifiers,
 
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                                Body = new BlockStatement {
 
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                                        new VariableDeclarationStatement (
 
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                                                useExplictType ? eventDeclaration.ReturnType.Clone () : new PrimitiveType ("var"), handlerName, 
 
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                                                useThisMemberReference ? 
 
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                                                (Expression)new MemberReferenceExpression (new ThisReferenceExpression (), initializer.Name) 
 
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                                                : new IdentifierExpression (initializer.Name)
 
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                                                ),
 
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                                        new IfElseStatement {
 
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                                                Condition = new BinaryOperatorExpression (new IdentifierExpression (handlerName), BinaryOperatorType.InEquality, new PrimitiveExpression (null)),
 
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                                                TrueStatement = new ExpressionStatement (new InvocationExpression (new IdentifierExpression (handlerName), arguments))
 
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                                        }
 
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                                }
 
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                        };
 
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                        foreach (var par in pars) {
 
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                                var typeName = context.CreateShortType(par.Type);
 
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                                var decl = new ParameterDeclaration(typeName, par.Name);
 
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                                methodDeclaration.Parameters.Add(decl);
 
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                        }
 
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                        return methodDeclaration;
 
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                }
 
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                static string GetNameProposal(VariableInitializer initializer)
 
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                {
 
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                        return "On" + char.ToUpper(initializer.Name[0]) + initializer.Name.Substring(1);
 
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                }
 
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                public IEnumerable<CodeAction> GetActions(RefactoringContext context)
 
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                {
 
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                        VariableInitializer initializer;
 
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                        var eventDeclaration = GetEventDeclaration(context, out initializer);
 
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                        if (eventDeclaration == null) {
 
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                                yield break;
 
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                        }
 
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                        var type = (TypeDeclaration)eventDeclaration.Parent;
 
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                        var proposedHandlerName = GetNameProposal(initializer);
 
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                        if (type.Members.Any(m => m is MethodDeclaration && m.Name == proposedHandlerName)) {
 
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                                yield break;
 
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                        }
 
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                        var resolvedType = context.Resolve(eventDeclaration.ReturnType).Type;
 
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                        if (resolvedType.Kind == TypeKind.Unknown) {
 
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                                yield break;
 
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                        }
 
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                        var invokeMethod = resolvedType.GetDelegateInvokeMethod();
 
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                        if (invokeMethod == null) {
 
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                                yield break;
 
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                        }
 
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                        yield return new CodeAction(context.TranslateString("Create event invocator"), script => {
 
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                                var methodDeclaration = CreateEventInvocator (context, type, eventDeclaration, initializer, invokeMethod, UseExplictType);
 
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                                script.InsertWithCursor(
 
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                                        context.TranslateString("Create event invocator"),
 
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                                        Script.InsertPosition.After,
 
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                                        methodDeclaration
 
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                                );
 
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                        }, initializer);
 
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                }
 
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                static EventDeclaration GetEventDeclaration (RefactoringContext context, out VariableInitializer initializer)
 
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                {
 
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                        var result = context.GetNode<EventDeclaration> ();
 
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                        if (result == null) {
 
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                                initializer = null;
 
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                                return null;
 
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                        }
 
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                        initializer = result.Variables.FirstOrDefault (v => v.NameToken.Contains (context.Location));
 
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                        return initializer != null ? result : null;
 
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                }
 
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        }
 
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}
 
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