// 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>
/// Performs a conditional (logical) 'or' of two boolean <see cref="Expression"/>s.
/// </summary>
public class Or : BinaryBooleanOperator
{
#region /* CONSTRUCTORS */
/// <summary>
/// Create an <see cref="Or"/> operator.
/// </summary>
public Or(Expression left, Expression right)
: base(left, right)
{ }
#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 = "||";
/// <summary>
/// The precedence of the operator.
/// </summary>
public const int Precedence = 385;
/// <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 an <see cref="Or"/> operator.
/// </summary>
public static Or Parse(Parser parser, CodeObject parent, ParseFlags flags)
{
return new Or(parser, parent);
}
protected Or(Parser parser, CodeObject parent)
: base(parser, parent)
{ }
/// <summary>
/// Get the precedence of the operator.
/// </summary>
public override int GetPrecedence()
{
return Precedence;
}
#endregion
#region /* RESOLVING */
/// <summary>
/// Perform a logical OR of two constant objects.
/// Supported types are: bool.
/// </summary>
protected override object EvaluateConstants(object leftConstant, object rightConstant)
{
if (leftConstant is bool && rightConstant is bool)
return ((bool)leftConstant || (bool)rightConstant);
return null; // The operation is invalid
}
#endregion
}
}