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Viewing changes to contrib/ICSharpCode.NRefactory.CSharp/Refactoring/CodeActions/RemoveBackingStoreAction.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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contrib/ICSharpCode.NRefactory.CSharp/Refactoring/CodeActions/RemoveBackingStoreAction.cs
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// 
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// RemoveBackingStore.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 ICSharpCode.NRefactory.CSharp.Resolver;
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using ICSharpCode.NRefactory.Semantics;
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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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{
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        [ContextAction("Remove backing store for property", Description = "Removes the backing store of a property and creates an auto property.")]
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        public class RemoveBackingStoreAction : ICodeActionProvider
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        {
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                public IEnumerable<CodeAction> GetActions(RefactoringContext context)
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                {
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                        var property = context.GetNode<PropertyDeclaration>();
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                        var field = GetBackingField(context);
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                        if (field == null) {
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                                yield break;
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                        }
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                        // create new auto property
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                        var newProperty = (PropertyDeclaration)property.Clone();
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                        newProperty.Getter.Body = BlockStatement.Null;
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                        newProperty.Setter.Body = BlockStatement.Null;
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                        yield return new CodeAction(context.TranslateString("Convert to auto property"), script => {
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                                script.Rename((IEntity)field, newProperty.Name);
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                                script.Remove (context.RootNode.GetNodeAt<FieldDeclaration> (field.Region.Begin));
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                                script.Replace (property, newProperty);
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                        });
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                }
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//              void ReplaceBackingFieldReferences (MDRefactoringContext context, IField backingStore, PropertyDeclaration property)
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//              {
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//                      using (var monitor = IdeApp.Workbench.ProgressMonitors.GetSearchProgressMonitor (true, true)) {
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//                              foreach (var memberRef in MonoDevelop.Ide.FindInFiles.ReferenceFinder.FindReferences (backingStore, monitor)) {
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//                                      if (property.Contains (memberRef.Line, memberRef.Column))
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//                                              continue;
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//                                      if (backingStore.Location.Line == memberRef.Line && backingStore.Location.Column == memberRef.Column)
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//                                              continue;
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//                                      context.Do (new TextReplaceChange () {
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//                                              FileName = memberRef.FileName,
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//                                              Offset = memberRef.Position,
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//                                              RemovedChars = memberRef.Name.Length,
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//                                              InsertedText = property.Name
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//                                      });
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//                              }
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//                      }
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//              }
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//
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                static readonly Version csharp3 = new Version(3, 0);
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                static IField GetBackingField (RefactoringContext context)
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                {
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                        var propertyDeclaration = context.GetNode<PropertyDeclaration> ();
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                        // automatic properties always need getter & setter
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                        if (propertyDeclaration == null || propertyDeclaration.Getter.IsNull || propertyDeclaration.Setter.IsNull || propertyDeclaration.Getter.Body.IsNull || propertyDeclaration.Setter.Body.IsNull)
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                                return null;
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                        if (!context.Supports(csharp3) || propertyDeclaration.HasModifier (ICSharpCode.NRefactory.CSharp.Modifiers.Abstract) || ((TypeDeclaration)propertyDeclaration.Parent).ClassType == ClassType.Interface)
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                                return null;
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                        var getterField = ScanGetter (context, propertyDeclaration);
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                        if (getterField == null)
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                                return null;
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                        var setterField = ScanSetter (context, propertyDeclaration);
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                        if (setterField == null)
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                                return null;
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                        if (getterField.Region != setterField.Region)
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                                return null;
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                        return getterField;
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                }
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                internal static IField ScanGetter (RefactoringContext context, PropertyDeclaration propertyDeclaration)
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                {
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                        if (propertyDeclaration.Getter.Body.Statements.Count != 1)
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                                return null;
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                        var returnStatement = propertyDeclaration.Getter.Body.Statements.First () as ReturnStatement;
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                        if (returnStatement == null)
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                                return null;
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                        var result = context.Resolve (returnStatement.Expression);
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                        if (result == null || !(result is MemberResolveResult))
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                                return null;
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                        return ((MemberResolveResult)result).Member as IField;
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                }
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                internal static IField ScanSetter (RefactoringContext context, PropertyDeclaration propertyDeclaration)
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                {
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                        if (propertyDeclaration.Setter.Body.Statements.Count != 1)
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                                return null;
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                        var setAssignment = propertyDeclaration.Setter.Body.Statements.First () as ExpressionStatement;
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                        var assignment = setAssignment != null ? setAssignment.Expression as AssignmentExpression : null;
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                        if (assignment == null || assignment.Operator != AssignmentOperatorType.Assign)
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                                return null;
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                        var result = context.Resolve (assignment.Left);
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                        if (result == null || !(result is MemberResolveResult))
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                                return null;
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                        return ((MemberResolveResult)result).Member as IField;
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                }
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        }
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}
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