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//
// RemoveRegion.cs
//
// Author:
// Mike Krüger <mkrueger@xamarin.com>
//
// Copyright (c) 2012 Xamarin Inc. (http://xamarin.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 System.Threading;
using System.Collections.Generic;
namespace ICSharpCode.NRefactory.CSharp.Refactoring
{
[ContextAction("Remove region", Description = "Removes a pre processor #region/#endregion directive.")]
public class RemoveRegionAction : ICodeActionProvider
{
public IEnumerable<CodeAction> GetActions(RefactoringContext context)
{
var directive = GetDirective(context);
if (directive == null) {
yield break;
}
var endDirective = DirectiveSearcher.GetEndRegion(context.RootNode, directive);
if (endDirective == null) {
yield break;
}
yield return new CodeAction (context.TranslateString("Remove region"), script => {
script.Remove (directive);
script.Remove (endDirective);
}, directive);
}
class DirectiveSearcher : DepthFirstAstVisitor
{
readonly PreProcessorDirective regionDirective;
bool searchDirectives = false;
int depth;
PreProcessorDirective endregion;
DirectiveSearcher (PreProcessorDirective regionDirective)
{
if (regionDirective == null)
throw new ArgumentNullException ("regionDirective");
this.regionDirective = regionDirective;
}
public static PreProcessorDirective GetEndRegion (AstNode rootNode, PreProcessorDirective regionDirective)
{
var visitor = new DirectiveSearcher (regionDirective);
rootNode.AcceptVisitor (visitor);
return visitor.endregion;
}
protected override void VisitChildren (AstNode node)
{
if (endregion != null)
return;
if (!searchDirectives && !regionDirective.Ancestors.Any (a => a == node))
return;
base.VisitChildren (node);
}
public override void VisitPreProcessorDirective (PreProcessorDirective preProcessorDirective)
{
if (searchDirectives) {
if (preProcessorDirective.Type == PreProcessorDirectiveType.Region) {
depth++;
} else if (preProcessorDirective.Type == PreProcessorDirectiveType.Endregion) {
depth--;
if (depth == 0) {
endregion = preProcessorDirective;
searchDirectives = false;
}
}
} else if (preProcessorDirective == regionDirective) {
searchDirectives = true;
depth = 1;
}
base.VisitPreProcessorDirective (preProcessorDirective);
}
}
static PreProcessorDirective GetDirective (RefactoringContext context)
{
var directive = context.GetNode<PreProcessorDirective> ();
if (directive == null || directive.Type != PreProcessorDirectiveType.Region)
return null;
return directive;
}
}
}
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