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//
// RemoveBackingStore.cs
//
// Author:
// Mike Krüger <mkrueger@novell.com>
//
// Copyright (c) 2011 Mike Krüger <mkrueger@novell.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;
using System.Linq;
using ICSharpCode.NRefactory.CSharp.Resolver;
using ICSharpCode.NRefactory.Semantics;
using ICSharpCode.NRefactory.TypeSystem;
using System.Threading;
using System.Collections.Generic;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction("Remove backing store for property", Description = "Removes the backing store of a property and creates an auto property.")]
public class RemoveBackingStoreAction : ICodeActionProvider
{
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
var property = context.GetNode<PropertyDeclaration>();
var field = GetBackingField(context);
if (field == null) {
yield break;
}
// create new auto property
var newProperty = (PropertyDeclaration)property.Clone();
newProperty.Getter.Body = BlockStatement.Null;
newProperty.Setter.Body = BlockStatement.Null;
yield return new CodeAction(context.TranslateString("Convert to auto property"), script => {
script.Rename((IEntity)field, newProperty.Name);
script.Remove (context.RootNode.GetNodeAt<FieldDeclaration> (field.Region.Begin));
script.Replace (property, newProperty);
}, property.NameToken);
}
// void ReplaceBackingFieldReferences (MDRefactoringContext context, IField backingStore, PropertyDeclaration property)
// {
// using (var monitor = IdeApp.Workbench.ProgressMonitors.GetSearchProgressMonitor (true, true)) {
// foreach (var memberRef in MonoDevelop.Ide.FindInFiles.ReferenceFinder.FindReferences (backingStore, monitor)) {
// if (property.Contains (memberRef.Line, memberRef.Column))
// continue;
// if (backingStore.Location.Line == memberRef.Line && backingStore.Location.Column == memberRef.Column)
// continue;
// context.Do (new TextReplaceChange () {
// FileName = memberRef.FileName,
// Offset = memberRef.Position,
// RemovedChars = memberRef.Name.Length,
// InsertedText = property.Name
// });
// }
// }
// }
//
static readonly Version csharp3 = new Version(3, 0);
internal static IField GetBackingField (RefactoringContext context)
{
var propertyDeclaration = context.GetNode<PropertyDeclaration> ();
// automatic properties always need getter & setter
if (propertyDeclaration == null || propertyDeclaration.Getter.IsNull || propertyDeclaration.Setter.IsNull || propertyDeclaration.Getter.Body.IsNull || propertyDeclaration.Setter.Body.IsNull)
return null;
if (!context.Supports(csharp3) || propertyDeclaration.HasModifier (ICSharpCode.NRefactory.CSharp.Modifiers.Abstract) || ((TypeDeclaration)propertyDeclaration.Parent).ClassType == ClassType.Interface)
return null;
var getterField = ScanGetter (context, propertyDeclaration);
if (getterField == null)
return null;
var setterField = ScanSetter (context, propertyDeclaration);
if (setterField == null)
return null;
if (!getterField.Equals(setterField))
return null;
return getterField;
}
internal static IField ScanGetter (RefactoringContext context, PropertyDeclaration propertyDeclaration)
{
if (propertyDeclaration.Getter.Body.Statements.Count != 1)
return null;
var returnStatement = propertyDeclaration.Getter.Body.Statements.First () as ReturnStatement;
if (returnStatement == null)
return null;
var result = context.Resolve (returnStatement.Expression);
if (result == null || !(result is MemberResolveResult))
return null;
return ((MemberResolveResult)result).Member as IField;
}
internal static IField ScanSetter (RefactoringContext context, PropertyDeclaration propertyDeclaration)
{
if (propertyDeclaration.Setter.Body.Statements.Count != 1)
return null;
var setAssignment = propertyDeclaration.Setter.Body.Statements.First () as ExpressionStatement;
var assignment = setAssignment != null ? setAssignment.Expression as AssignmentExpression : null;
if (assignment == null || assignment.Operator != AssignmentOperatorType.Assign)
return null;
var result = context.Resolve (assignment.Left);
if (result == null || !(result is MemberResolveResult))
return null;
return ((MemberResolveResult)result).Member as IField;
}
}
}
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