private RqlExpression ParseExpression(RqlToken functionToken)
{
RqlToken token = tokenizer.Next();
if (!token.IsLeftParen)
{
throw new RqlParseException(token);
}
var arguments = new List <RqlExpression>();
while (true)
{
token = tokenizer.Next();
RqlExpression argument = null;
if (token.IsIdentifier)
{
if (tokenizer.PeekNext().IsLeftParen)
{
argument = ParseExpression(token);
}
else
{
argument = RqlExpression.Identifier(token);
}
}
else if (token.IsConstant)
{
argument = RqlExpression.Constant(token);
}
else if (token.IsLeftParen)
{
argument = ParseTuple(token);
}
else
{
throw new RqlParseException(token);
}
arguments.Add(argument);
token = tokenizer.Next();
if (token.IsComma)
{
continue;
}
else if (token.IsRightParen)
{
break;
}
else
{
throw new RqlParseException(token);
}
}
return(RqlExpression.FunctionCall(functionToken, arguments));
}
