/// <summary>
/// Parses the -, not unary operators.
/// </summary>
/// <returns>The lexical token representing the expression.</returns>
private QueryToken ParseUnary()
{
this.RecurseEnter();
if (this.lexer.CurrentToken.Kind == ExpressionTokenKind.Minus || this.TokenIdentifierIs(ExpressionConstants.KeywordNot))
{
ExpressionToken operatorToken = this.lexer.CurrentToken;
this.lexer.NextToken();
if (operatorToken.Kind == ExpressionTokenKind.Minus && (ExpressionLexerUtils.IsNumeric(this.lexer.CurrentToken.Kind)))
{
ExpressionToken numberLiteral = this.lexer.CurrentToken;
numberLiteral.Text = "-" + numberLiteral.Text;
numberLiteral.Position = operatorToken.Position;
this.lexer.CurrentToken = numberLiteral;
this.RecurseLeave();
return(this.ParsePrimary());
}
QueryToken operand = this.ParseUnary();
UnaryOperatorKind unaryOperatorKind;
if (operatorToken.Kind == ExpressionTokenKind.Minus)
{
unaryOperatorKind = UnaryOperatorKind.Negate;
}
else
{
Debug.Assert(operatorToken.IdentifierIs(ExpressionConstants.KeywordNot, enableCaseInsensitiveBuiltinIdentifier), "Was a new unary operator added?");
unaryOperatorKind = UnaryOperatorKind.Not;
}
this.RecurseLeave();
return(new UnaryOperatorToken(unaryOperatorKind, operand));
}
this.RecurseLeave();
return(this.ParsePrimary());
}