def intersperse_parser(parser_list: list,
interspersed: pp.ParserElement) -> pp.ParserElement:
ret = interspersed.copy()
for i in parser_list:
ret = ret + i.copy() + interspersed.copy()
return ret
def _create_optional_argument(self,
name_list: list,
arg_name: str,
value_parser: pp.ParserElement,
help_text=None,
optional=True):
arg = pp.MatchFirst([pp.CaselessKeyword(i) for i in name_list
]).setParseAction(lambda x: arg_name)
# It is important that the ParseAction is inside the Optional! Otherwise we will get errors if it does not
# match.
complete = (arg + value_parser.copy()).setName(
arg_name).setParseAction(lambda x: {x[0]: x[1]})(arg_name)
if optional:
complete = pp.Optional(complete)
return self._arg_info(complete, arg_name, name_list, help_text)
