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//
// RemoveField.cs
//
// Author:
// Ciprian Khlud <ciprian.mustiata@yahoo.com>
//
// Copyright (c) 2013 Ciprian Khlud
//
// 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 ICSharpCode.NRefactory.CSharp.Refactoring;
using System.Collections.Generic;
using ICSharpCode.NRefactory.CSharp.Resolver;
using ICSharpCode.NRefactory.Semantics;
namespace ICSharpCode.NRefactory.CSharp
{
// [ContextAction("Removes a field from a class", Description = "It removes also the empty assingments and the usages")]
public class RemoveFieldRefactoryAction : ICodeActionProvider
{
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
var fieldDeclaration = GetFieldDeclaration(context);
if(fieldDeclaration==null)
yield break;
yield return new CodeAction(string.Format(context.TranslateString("Remove field '{0}'"), fieldDeclaration.Name)
, script => GenerateNewScript(
script, fieldDeclaration, context), fieldDeclaration);
}
void GenerateNewScript(Script script, FieldDeclaration fieldDeclaration, RefactoringContext context)
{
var firstOrNullObject = fieldDeclaration.Variables.FirstOrNullObject();
if(firstOrNullObject==null)
return;
var matchedNodes = ComputeMatchNodes(context, firstOrNullObject);
foreach (var matchNode in matchedNodes)
{
var parent = matchNode.Parent;
if (matchNode is VariableInitializer)
{
script.Remove(parent);
}
else
if (matchNode is IdentifierExpression)
{
if(parent is AssignmentExpression)
{
script.Remove(parent.Parent);
}
else
{
var clone = (IdentifierExpression)matchNode.Clone();
clone.Identifier = "TODO";
script.Replace(matchNode, clone);
}
}
}
}
private static List<AstNode> ComputeMatchNodes(RefactoringContext context, VariableInitializer firstOrNullObject)
{
var referenceFinder = new FindReferences();
var matchedNodes = new List<AstNode>();
var resolveResult = context.Resolver.Resolve(firstOrNullObject);
var member = resolveResult as MemberResolveResult;
if (member == null)//not a member is unexpected case, so is better to return no match than to break the code
return matchedNodes;
FoundReferenceCallback callback = (matchNode, result) => matchedNodes.Add(matchNode);
var searchScopes = referenceFinder.GetSearchScopes(member.Member);
referenceFinder.FindReferencesInFile(searchScopes,
context.UnresolvedFile,
context.RootNode as SyntaxTree,
context.Compilation, callback,
context.CancellationToken);
return matchedNodes;
}
FieldDeclaration GetFieldDeclaration(RefactoringContext context)
{
var result = context.GetNode<FieldDeclaration>();
return result;
}
}
}
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