private iterator Parse_iterator()
{
if (_index >= _tokens.Count())
{
return(null);
} // must be first line on any atom
var _data = _tokens[_index];
var _result = new iterator(_data);
if (_result.is_iterator)
{
_index++;
return(_result);
}
else
{
return(null);
}
}
public factor(iterator _iterator)
{
iterator = _iterator;
expression = iterator.expression;
}