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Viewing changes to contrib/NRefactory/Project/Src/Lexer/CSharp/ConditionalCompilation.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/NRefactory/Project/Src/Lexer/CSharp/ConditionalCompilation.cs
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// <file>
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//     <copyright see="prj:///doc/copyright.txt"/>
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//     <license see="prj:///doc/license.txt"/>
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//     <owner name="Daniel Grunwald"/>
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//     <version>$Revision$</version>
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// </file>
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using System;
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using System.Collections.Generic;
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using ICSharpCode.OldNRefactory.Ast;
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using ICSharpCode.OldNRefactory.Visitors;
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namespace ICSharpCode.OldNRefactory.Parser.CSharp
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{
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        public sealed class ConditionalCompilation : AbstractAstVisitor
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        {
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                static readonly object SymbolDefined = new object();
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                Dictionary<string, object> symbols = new Dictionary<string, object>();
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                public IDictionary<string, object> Symbols { 
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                        get { return symbols; }
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                }
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                public void Define(string symbol)
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                {
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                        symbols[symbol] = SymbolDefined;
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                }
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                public void Undefine(string symbol)
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                {
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                        symbols.Remove(symbol);
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                }
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                public bool Evaluate(Expression condition)
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                {
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                        return condition.AcceptVisitor(this, null) == SymbolDefined;
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                }
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                public override object VisitPrimitiveExpression(PrimitiveExpression primitiveExpression, object data)
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                {
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                        if (primitiveExpression.Value is bool)
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                                return (bool)primitiveExpression.Value ? SymbolDefined : null;
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                        else
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                                return null;
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                }
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                public override object VisitIdentifierExpression(IdentifierExpression identifierExpression, object data)
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                {
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                        return symbols.ContainsKey(identifierExpression.Identifier) ? SymbolDefined : null;
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                }
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                public override object VisitUnaryOperatorExpression(UnaryOperatorExpression unaryOperatorExpression, object data)
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                {
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                        if (unaryOperatorExpression.Op == UnaryOperatorType.Not) {
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                                return unaryOperatorExpression.Expression.AcceptVisitor(this, data) == SymbolDefined ? null : SymbolDefined;
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                        } else {
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                                return null;
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                        }
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                }
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                public override object VisitBinaryOperatorExpression(BinaryOperatorExpression binaryOperatorExpression, object data)
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                {
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                        bool lhs = binaryOperatorExpression.Left.AcceptVisitor(this, data) == SymbolDefined;
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                        bool rhs = binaryOperatorExpression.Right.AcceptVisitor(this, data) == SymbolDefined;
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                        bool result;
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                        switch (binaryOperatorExpression.Op) {
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                                case BinaryOperatorType.LogicalAnd:
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                                        result = lhs && rhs;
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                                        break;
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                                case BinaryOperatorType.LogicalOr:
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                                        result = lhs || rhs;
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                                        break;
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                                case BinaryOperatorType.Equality:
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                                        result = lhs == rhs;
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                                        break;
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                                case BinaryOperatorType.InEquality:
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                                        result = lhs != rhs;
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                                        break;
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                                default:
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                                        return null;
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                        }
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                        return result ? SymbolDefined : null;
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                }
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                public override object VisitParenthesizedExpression(ParenthesizedExpression parenthesizedExpression, object data)
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                {
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                        return parenthesizedExpression.Expression.AcceptVisitor(this, data);
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                }
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        }
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}