private RqlTupleExpression ParseTuple(RqlToken leftParenToken)
{
var constants = new List <RqlConstantExpression>();
Type itemType = null;
while (true)
{
RqlToken token = tokenizer.Next();
if (token.IsConstant)
{
if (itemType == null)
{
itemType = token.Data.GetType();
}
else if (token.Data.GetType() != itemType)
{
throw new RqlParseException(token, "Tuple items must all be of the same type");
}
constants.Add(RqlExpression.Constant(token));
}
else
{
throw new RqlParseException(token);
}
token = tokenizer.Next();
if (token.IsComma)
{
continue;
}
else if (token.IsRightParen)
{
break;
}
else
{
throw new RqlParseException(token);
}
}
return(RqlExpression.Tuple(leftParenToken, constants));
}
