public arith_expression_sequence(arith_expression _arith_expression, arith_expression_sequence _arith_expression_sequence, pipe _pipe)
{
pipe = _pipe;
arith_expression = _arith_expression;
self_arith_expression_sequence = _arith_expression_sequence;
expression = self_arith_expression_sequence?.expression + pipe?.expression + arith_expression.expression;
}
private pipe Parse_pipe()
{
/* comma:
* "," */
if (_index >= _tokens.Count())
{
return(null);
} // must be first line on any atom
var _data = _tokens[_index];
var _result = new pipe(_data);
if (_result.is_pipe)
{
_index++;
return(_result);
}
else
{
return(null);
}
}