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 : //usr/share/crypto-policies/python/cryptopolicies/validation/scope.py
# SPDX-License-Identifier: LGPL-2.1-or-later

# Copyright (c) 2021 Red Hat, Inc.

import fnmatch

from .general import PolicySyntaxError


class ScopeSyntaxError(PolicySyntaxError):
    pass


class ScopeUnknownError(ScopeSyntaxError):
    def __init__(self, scope_glob):
        super().__init__(f'unknown scope {scope_glob}')


class ScopeSelectorEmptyError(ScopeSyntaxError):
    def __init__(self):
        super().__init__('empty scope selector')


class ScopeSelectorIllegalCharacterError(ScopeSyntaxError):
    def __init__(self, selector):
        super().__init__(f'illegal character in scope selector `{selector}`')


class ScopeSelectorCurlyBracketsError(ScopeSyntaxError):
    def __init__(self, pattern):
        super().__init__(f'unsupported curly brackets usage in `{pattern}`')


class ScopeSelectorCommaError(ScopeSyntaxError):
    def __init__(self, pattern):
        super().__init__(f'unsupported comma usage in `{pattern}`')


class ScopeSelectorMatchedNothingError(ScopeSyntaxError):
    def __init__(self, pattern):
        super().__init__(f'scope selector `{pattern}` matches no scope')


def illegal_characters(p, original_pattern):
    if not all(c.isalnum() or c in '{,}*_-' for c in p):
        raise ScopeSelectorIllegalCharacterError(original_pattern)


def curly_brackets(p, original_pattern):
    if ((p.count('{'), p.count('}')) not in [(0, 0), (1, 1)]
            or p.startswith('{') and not p.endswith('}')
            or not p.startswith('{') and p.endswith('}')):
        raise ScopeSelectorCurlyBracketsError(original_pattern)


def resulting_globs(globs, all_scopes, original_pattern):
    if any(',' in g for g in globs):
        raise ScopeSelectorCommaError(original_pattern)
    for g in globs:
        if not g:
            raise ScopeSelectorEmptyError()
        if not fnmatch.filter(all_scopes, g):
            if '*' in g:
                raise ScopeSelectorMatchedNothingError(g)
            raise ScopeUnknownError(g)

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