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Viewing changes to external/nrefactory/ICSharpCode.NRefactory.CSharp/Refactoring/CodeActions/MergeNestedIfAction.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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external/nrefactory/ICSharpCode.NRefactory.CSharp/Refactoring/CodeActions/MergeNestedIfAction.cs
 
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// 
 
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// MergeNestedIfAction.cs
 
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//  
 
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// Author:
 
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//       Mansheng Yang <lightyang0@gmail.com>
 
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// 
 
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// Copyright (c) 2012 Mansheng Yang <lightyang0@gmail.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.Linq;
 
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namespace ICSharpCode.NRefactory.CSharp.Refactoring
 
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{
 
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        [ContextAction ("Merge nested 'if'", Description = "Merge two nested 'if' statements.")]
 
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        public class MergeNestedIfAction : SpecializedCodeAction<IfElseStatement>
 
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        {
 
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                static readonly InsertParenthesesVisitor insertParenthesesVisitor = new InsertParenthesesVisitor ();
 
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                protected override CodeAction GetAction (RefactoringContext context, IfElseStatement node)
 
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                {
 
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                        if (!node.IfToken.Contains (context.Location))
 
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                                return null;
 
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                        IfElseStatement outerIfStatement;
 
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                        IfElseStatement innerIfStatement = GetInnerIfStatement (node);
 
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                        if (innerIfStatement != null) {
 
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                                if (!innerIfStatement.FalseStatement.IsNull)
 
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                                        return null;
 
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                                outerIfStatement = node;
 
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                        } else {
 
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                                outerIfStatement = GetOuterIfStatement (node);
 
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                                if (outerIfStatement == null || !outerIfStatement.FalseStatement.IsNull)
 
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                                        return null;
 
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                                innerIfStatement = node;
 
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                        }
 
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                        return new CodeAction (context.TranslateString ("Merge nested 'if's"),
 
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                                script =>
 
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                                {
 
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                                        var mergedIfStatement = new IfElseStatement
 
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                                        {
 
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                                                Condition = new BinaryOperatorExpression (outerIfStatement.Condition.Clone (),
 
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                                                                                                                                  BinaryOperatorType.ConditionalAnd, 
 
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                                                                                                                                  innerIfStatement.Condition.Clone ()),
 
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                                                TrueStatement = innerIfStatement.TrueStatement.Clone ()
 
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                                        };
 
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                                        mergedIfStatement.Condition.AcceptVisitor (insertParenthesesVisitor);
 
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                                        script.Replace (outerIfStatement, mergedIfStatement);
 
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                                }, node);
 
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                }
 
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                static IfElseStatement GetOuterIfStatement (IfElseStatement node)
 
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                {
 
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                        var outerIf = node.Parent as IfElseStatement;
 
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                        if (outerIf != null)
 
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                                return outerIf;
 
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                        var blockStatement = node.Parent as BlockStatement;
 
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                        while (blockStatement != null && blockStatement.Statements.Count == 1) {
 
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                                outerIf = blockStatement.Parent as IfElseStatement;
 
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                                if (outerIf != null)
 
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                                        return outerIf;
 
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                                blockStatement = blockStatement.Parent as BlockStatement;
 
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                        }
 
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                        return null;
 
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                }
 
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                static IfElseStatement GetInnerIfStatement (IfElseStatement node)
 
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                {
 
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                        if (!node.FalseStatement.IsNull)
 
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                                return null;
 
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                        var innerIf = node.TrueStatement as IfElseStatement;
 
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                        if (innerIf != null)
 
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                                return innerIf;
 
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                        var blockStatement = node.TrueStatement as BlockStatement;
 
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                        while (blockStatement != null && blockStatement.Statements.Count == 1) {
 
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                                innerIf = blockStatement.Statements.First () as IfElseStatement;
 
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                                if (innerIf != null)
 
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                                        return innerIf;
 
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                                blockStatement = blockStatement.Statements.First () as BlockStatement;
 
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                        }
 
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                        return null;
 
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                }
 
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        }
 
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}