晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Current File : //opt/imunify360/venv/lib/python3.11/site-packages/pip/_vendor/pygments/regexopt.py
"""
    pygments.regexopt
    ~~~~~~~~~~~~~~~~~

    An algorithm that generates optimized regexes for matching long lists of
    literal strings.

    :copyright: Copyright 2006-2023 by the Pygments team, see AUTHORS.
    :license: BSD, see LICENSE for details.
"""

import re
from re import escape
from os.path import commonprefix
from itertools import groupby
from operator import itemgetter

CS_ESCAPE = re.compile(r'[\[\^\\\-\]]')
FIRST_ELEMENT = itemgetter(0)


def make_charset(letters):
    return '[' + CS_ESCAPE.sub(lambda m: '\\' + m.group(), ''.join(letters)) + ']'


def regex_opt_inner(strings, open_paren):
    """Return a regex that matches any string in the sorted list of strings."""
    close_paren = open_paren and ')' or ''
    # print strings, repr(open_paren)
    if not strings:
        # print '-> nothing left'
        return ''
    first = strings[0]
    if len(strings) == 1:
        # print '-> only 1 string'
        return open_paren + escape(first) + close_paren
    if not first:
        # print '-> first string empty'
        return open_paren + regex_opt_inner(strings[1:], '(?:') \
            + '?' + close_paren
    if len(first) == 1:
        # multiple one-char strings? make a charset
        oneletter = []
        rest = []
        for s in strings:
            if len(s) == 1:
                oneletter.append(s)
            else:
                rest.append(s)
        if len(oneletter) > 1:  # do we have more than one oneletter string?
            if rest:
                # print '-> 1-character + rest'
                return open_paren + regex_opt_inner(rest, '') + '|' \
                    + make_charset(oneletter) + close_paren
            # print '-> only 1-character'
            return open_paren + make_charset(oneletter) + close_paren
    prefix = commonprefix(strings)
    if prefix:
        plen = len(prefix)
        # we have a prefix for all strings
        # print '-> prefix:', prefix
        return open_paren + escape(prefix) \
            + regex_opt_inner([s[plen:] for s in strings], '(?:') \
            + close_paren
    # is there a suffix?
    strings_rev = [s[::-1] for s in strings]
    suffix = commonprefix(strings_rev)
    if suffix:
        slen = len(suffix)
        # print '-> suffix:', suffix[::-1]
        return open_paren \
            + regex_opt_inner(sorted(s[:-slen] for s in strings), '(?:') \
            + escape(suffix[::-1]) + close_paren
    # recurse on common 1-string prefixes
    # print '-> last resort'
    return open_paren + \
        '|'.join(regex_opt_inner(list(group[1]), '')
                 for group in groupby(strings, lambda s: s[0] == first[0])) \
        + close_paren


def regex_opt(strings, prefix='', suffix=''):
    """Return a compiled regex that matches any string in the given list.

    The strings to match must be literal strings, not regexes.  They will be
    regex-escaped.

    *prefix* and *suffix* are pre- and appended to the final regex.
    """
    strings = sorted(strings)
    return prefix + regex_opt_inner(strings, '(') + suffix

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