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Viewing changes to contrib/ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssues/ExplicitConversionInForEachIssue.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/ExplicitConversionInForEachIssue.cs
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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team
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// 
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this
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// software and associated documentation files (the "Software"), to deal in the Software
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// without restriction, including without limitation the rights to use, copy, modify, merge,
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// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
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// to whom the Software is 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 all copies or
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// 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 IMPLIED,
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// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
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// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
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// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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using System;
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using System.Collections.Generic;
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using ICSharpCode.NRefactory.CSharp.Resolver;
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using ICSharpCode.NRefactory.Semantics;
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using ICSharpCode.NRefactory.TypeSystem;
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namespace ICSharpCode.NRefactory.CSharp.Refactoring
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{
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        [IssueDescription("Incorrect element type in foreach over generic collection",
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                          Description= "Detects hidden explicit conversions in foreach loops.",
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                          Category = IssueCategories.CodeQualityIssues,
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                          Severity = Severity.Warning)]
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        public class ExplicitConversionInForEachIssue : ICodeIssueProvider
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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).GetIssues();
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                }
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                class GatherVisitor : GatherVisitorBase
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                {
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                        CSharpConversions conversions;
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                        public GatherVisitor (BaseRefactoringContext ctx) : base (ctx)
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                        {
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                        }
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                        public override void VisitForeachStatement(ForeachStatement foreachStatement)
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                        {
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                                base.VisitForeachStatement(foreachStatement);
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                                var rr = ctx.Resolve(foreachStatement) as ForEachResolveResult;
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                                if (rr == null)
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                                        return;
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                                if (rr.ElementType.Kind == TypeKind.Unknown)
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                                        return;
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                                if (ReflectionHelper.GetTypeCode(rr.ElementType) == TypeCode.Object)
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                                        return;
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                                if (conversions == null) {
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                                        conversions = CSharpConversions.Get(ctx.Compilation);
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                                }
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                                Conversion c = conversions.ImplicitConversion(rr.ElementType, rr.ElementVariable.Type);
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                                if (c.IsValid)
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                                        return;
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                                var csResolver = ctx.GetResolverStateBefore(foreachStatement);
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                                var builder = new TypeSystemAstBuilder(csResolver);
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                                AstType elementType = builder.ConvertType(rr.ElementType);
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                                AstType variableType = foreachStatement.VariableType;
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                                string text = ctx.TranslateString("Collection element type '{0}' is not implicitly convertible to '{1}'");
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                                AddIssue(variableType, string.Format(text, elementType.GetText(), variableType.GetText()));
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                        }
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                }
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        }
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}