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Viewing changes to contrib/ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssues/ConditionalToNullCoalescingIssue.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/CodeIssues/ConditionalToNullCoalescingIssue.cs
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// 
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// ConditionalToNullCoalescingInspector.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 <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.Collections.Generic;
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using System.Linq;
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using ICSharpCode.NRefactory.PatternMatching;
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namespace ICSharpCode.NRefactory.CSharp.Refactoring
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{
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        /// <summary>
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        /// Checks for "a != null ? a : other"<expr>
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        /// Converts to: "a ?? other"<expr>
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        /// </summary>
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        [IssueDescription("'?:' expression can be converted to '??' expression",
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                          Description="'?:' expression can be converted to '??' expression.",
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                          Category = IssueCategories.Opportunities,
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                          Severity = Severity.Suggestion)]
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        public class ConditionalToNullCoalescingIssue : ICodeIssueProvider
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        {
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                static readonly Pattern pattern = new Choice {
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                        // a != null ? a : other
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                        new ConditionalExpression(
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                                PatternHelper.CommutativeOperator(new AnyNode("a"), BinaryOperatorType.InEquality, new NullReferenceExpression()),
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                                new Backreference("a"),
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                                new AnyNode("other")
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                        ),
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                        // a == null ? other : a
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                        new ConditionalExpression(
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                                PatternHelper.CommutativeOperator(new AnyNode("a"), BinaryOperatorType.Equality, new NullReferenceExpression()),
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                                new AnyNode("other"),
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                                new Backreference("a")
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                        ),
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                };
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                public IEnumerable<CodeIssue> GetIssues(BaseRefactoringContext context)
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                {
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                        return new GatherVisitor(context, this).GetIssues();
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                }
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                class GatherVisitor : GatherVisitorBase
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                {
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                        readonly ConditionalToNullCoalescingIssue inspector;
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                        public GatherVisitor (BaseRefactoringContext ctx, ConditionalToNullCoalescingIssue inspector) : base (ctx)
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                        {
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                                this.inspector = inspector;
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                        }
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                        public override void VisitConditionalExpression(ConditionalExpression conditionalExpression)
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                        {
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                                Match m = pattern.Match(conditionalExpression);
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                                if (m.Success) {
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                                        var a = m.Get<Expression>("a").Single();
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                                        var other = m.Get<Expression>("other").Single();
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                                        AddIssue(conditionalExpression, ctx.TranslateString("Convert to '??' expression"), script => {
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                                                var expr = new BinaryOperatorExpression (a.Clone (), BinaryOperatorType.NullCoalescing, other.Clone ());
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                                                script.Replace (conditionalExpression, expr);
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                                        });
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                                }
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                                base.VisitConditionalExpression (conditionalExpression);
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                        }
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                }
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        }
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}