// The Nova Project by Ken Beckett. // Copyright (C) 2007-2012 Inevitable Software, all rights reserved. // Released under the Common Development and Distribution License, CDDL-1.0: http://opensource.org/licenses/cddl1.php using Nova.Parsing; namespace Nova.CodeDOM { /// <summary> /// Returns the system type object for the specified type. /// </summary> public class TypeOf : TypeOperator { #region /* CONSTRUCTORS */ /// <summary> /// Create a <see cref="TypeOf"/> operator - the expression must evaluate to a <see cref="TypeRef"/> in valid code. /// </summary> public TypeOf(Expression type) : base(type) { } #endregion #region /* PROPERTIES */ /// <summary> /// The symbol associated with the operator. /// </summary> public override string Symbol { get { return ParseToken; } } #endregion #region /* PARSING */ /// <summary> /// The token used to parse the code object. /// </summary> public const string ParseToken = "typeof"; /// <summary> /// The precedence of the operator. /// </summary> public const int Precedence = 100; /// <summary> /// True if the operator is left-associative, or false if it's right-associative. /// </summary> public const bool LeftAssociative = true; internal static new void AddParsePoints() { Parser.AddOperatorParsePoint(ParseToken, Precedence, LeftAssociative, false, Parse); } /// <summary> /// Parse a <see cref="TypeOf"/> operator. /// </summary> public static TypeOf Parse(Parser parser, CodeObject parent, ParseFlags flags) { return new TypeOf(parser, parent); } protected TypeOf(Parser parser, CodeObject parent) : base(parser, parent) { ParseKeywordAndArgument(parser, ParseFlags.Type); } /// <summary> /// Get the precedence of the operator. /// </summary> public override int GetPrecedence() { return Precedence; } #endregion #region /* RESOLVING */ /// <summary> /// Evaluate the type of the <see cref="Expression"/>. /// </summary> /// <returns>The resulting <see cref="TypeRef"/> or <see cref="UnresolvedRef"/>.</returns> public override TypeRefBase EvaluateType(bool withoutConstants) { // The resulting type of 'typeof' is always 'System.Type' return TypeRef.TypeTypeRef; } #endregion } }
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