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Viewing changes to external/nrefactory/ICSharpCode.NRefactory.CSharp/Refactoring/CodeIssues/RedundantFieldInitializerIssue.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/CodeIssues/RedundantFieldInitializerIssue.cs
 
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// 
 
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// RedundantFieldInitializerIssue.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.Collections.Generic;
 
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using ICSharpCode.NRefactory.PatternMatching;
 
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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 ("Initializing field with default value is redundant",
 
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                                                Description = "Initializing field with default value is redundant.",
 
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                                                Category = IssueCategories.Redundancies,
 
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                                                Severity = Severity.Hint,
 
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                                                IssueMarker = IssueMarker.GrayOut,
 
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                        ResharperDisableKeyword = "RedundantDefaultFieldInitializer")]
 
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        public class RedundantFieldInitializerIssue : 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<RedundantFieldInitializerIssue>
 
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                {
 
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                        public GatherVisitor(BaseRefactoringContext ctx)
 
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                                : base(ctx)
 
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                        {
 
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                        }
 
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                        public override void VisitFieldDeclaration (FieldDeclaration fieldDeclaration)
 
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                        {
 
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                                base.VisitFieldDeclaration (fieldDeclaration);
 
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                                if (fieldDeclaration.HasModifier (Modifiers.Const))
 
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                                        return;
 
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                                var defaultValueExpr = GetDefaultValueExpression (fieldDeclaration.ReturnType);
 
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                                if (defaultValueExpr == null)
 
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                                        return;
 
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                                foreach (var variable1 in fieldDeclaration.Variables) {
 
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                                        var variable = variable1;
 
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                                        if (!defaultValueExpr.Match (variable.Initializer).Success)
 
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                                                continue;
 
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                                        AddIssue (variable.Initializer, ctx.TranslateString ("Remove redundant field initializer"),
 
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                                                script => script.Replace (variable, new VariableInitializer (variable.Name)));
 
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                                }
 
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                        }
 
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                        Expression GetDefaultValueExpression (AstType astType)
 
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                        {
 
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                                var type = ctx.ResolveType (astType);
 
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                                if ((type.IsReferenceType ?? false) || type.Kind == TypeKind.Dynamic)
 
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                                        return new NullReferenceExpression ();
 
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                                var typeDefinition = type.GetDefinition ();
 
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                                if (typeDefinition != null) {
 
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                                        switch (typeDefinition.KnownTypeCode) {
 
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                                                case KnownTypeCode.Boolean:
 
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                                                        return new PrimitiveExpression (false);
 
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                                                case KnownTypeCode.Char:
 
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                                                        return new PrimitiveExpression ('\0');
 
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                                                case KnownTypeCode.SByte:
 
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                                                case KnownTypeCode.Byte:
 
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                                                case KnownTypeCode.Int16:
 
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                                                case KnownTypeCode.UInt16:
 
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                                                case KnownTypeCode.Int32:
 
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                                                        return new PrimitiveExpression (0);
 
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                                                case KnownTypeCode.Int64:
 
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                                                        return new Choice { new PrimitiveExpression (0), new PrimitiveExpression (0L) };
 
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                                                case KnownTypeCode.UInt32:
 
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                                                        return new Choice { new PrimitiveExpression (0), new PrimitiveExpression (0U) };
 
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                                                case KnownTypeCode.UInt64:
 
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                                                        return new Choice {
 
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                                                                new PrimitiveExpression (0), new PrimitiveExpression (0U), new PrimitiveExpression (0UL)
 
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                                                        };
 
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                                                case KnownTypeCode.Single:
 
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                                                        return new Choice { new PrimitiveExpression (0), new PrimitiveExpression (0F) };
 
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                                                case KnownTypeCode.Double:
 
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                                                        return new Choice {
 
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                                                                new PrimitiveExpression (0), new PrimitiveExpression (0F), new PrimitiveExpression (0D)
 
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                                                        };
 
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                                                case KnownTypeCode.Decimal:
 
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                                                        return new Choice { new PrimitiveExpression (0), new PrimitiveExpression (0M) };
 
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                                                case KnownTypeCode.NullableOfT:
 
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                                                        return new NullReferenceExpression ();
 
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                                        }
 
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                                        if (type.Kind == TypeKind.Struct)
 
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                                                return new ObjectCreateExpression (astType.Clone ());
 
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                                }
 
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                                return new DefaultValueExpression (astType.Clone ());
 
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                        } 
 
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                }
 
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        }
 
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}