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