import re
import sys

from .utils import get_regexp_width

Py36 = (sys.version_info[:2] >= (3, 6))


###{standalone
###}



class LexerConf:
    def __init__(self, tokens, ignore=(), postlex=None, callbacks=None):
        self.tokens = tokens
        self.ignore = ignore
        self.postlex = postlex
        self.callbacks = callbacks or {}

class ParserConf:
    def __init__(self, rules, callback, start):
        self.rules = rules
        self.callback = callback
        self.start = start



class Pattern(object):
    def __init__(self, value, flags=()):
        self.value = value
        self.flags = frozenset(flags)

    def __repr__(self):
        return repr(self.to_regexp())

    # Pattern Hashing assumes all subclasses have a differe