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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"""
General functions for HTML manipulation.
"""

import re as _re
from html.entities import html5 as _html5


__all__ = ['escape', 'unescape']


def escape(s, quote=True):
    """
    Replace special characters "&", "<" and ">" to HTML-safe sequences.
    If the optional flag quote is true (the default), the quotation mark
    characters, both double quote (") and single quote (') characters are also
    translated.
    """
    s = s.replace("&", "&amp;") # Must be done first!
    s = s.replace("<", "&lt;")
    s = s.replace(">", "&gt;")
    if quote:
        s = s.replace('"', "&quot;")
        s = s.replace('\'', "&#x27;")
    return s


# see http://www.w3.org/TR/html5/syntax.html#tokenizing-character-references

_invalid_charrefs = {
    0x00: '\ufffd',  # REPLACEMENT CHARACTER
    0x0d: '\r',      # CARRIAGE RETURN
    0x80: '\u20ac',  # EURO SIGN
    0x81: '\x81',    # <control>
    0x82: '\u201a',  # SINGLE LOW-9 QUOTATION MARK
    0x83: '\u0192',  # LATIN SMALL LETTER F WITH HOOK
    0x84: '\u201e',  # DOUBLE LOW-9 QUOTATION MARK
    0x85: '\u2026',  # HORIZONTAL ELLIPSIS
    0x86: '\u2020',  # DAGGER
    0x87: '\u2021',  # DOUBLE DAGGER
    0x88: '\u02c6',  # MODIFIER LETTER CIRCUMFLEX ACCENT
    0x89: '\u2030',  # PER MILLE SIGN
    0x8a: '\u0160',  # LATIN CAPITAL LETTER S WITH CARON
    0x8b: '\u2039',  # SINGLE LEFT-POINTING ANGLE QUOTATION MARK
    0x8c: '\u0152',  # LATIN CAPITAL LIGATURE OE
    0x8d: '\x8d',    # <control>
    0x8e: '\u017d',  # LATIN CAPITAL LETTER Z WITH CARON
    0x8f: '\x8f',    # <control>
    0x90: '\x90',    # <control>
    0x91: '\u2018',  # LEFT SINGLE QUOTATION MARK
    0x92: '\u2019',  # RIGHT SINGLE QUOTATION MARK
    0x93: '\u201c',  # LEFT DOUBLE QUOTATION MARK
    0x94: '\u201d',  # RIGHT DOUBLE QUOTATION MARK
    0x95: '\u2022',  # BULLET
    0x96: '\u2013',  # EN DASH
    0x97: '\u2014',  # EM DASH
    0x98: '\u02dc',  # SMALL TILDE
    0x99: '\u2122',  # TRADE MARK SIGN
    0x9a: '\u0161',  # LATIN SMALL LETTER S WITH CARON
    0x9b: '\u203a',  # SINGLE RIGHT-POINTING ANGLE QUOTATION MARK
    0x9c: '\u0153',  # LATIN SMALL LIGATURE OE
    0x9d: '\x9d',    # <control>
    0x9e: '\u017e',  # LATIN SMALL LETTER Z WITH CARON
    0x9f: '\u0178',  # LATIN CAPITAL LETTER Y WITH DIAERESIS
}

_invalid_codepoints = {
    # 0x0001 to 0x0008
    0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8,
    # 0x000E to 0x001F
    0xe, 0xf, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19,
    0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f,
    # 0x007F to 0x009F
    0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a,
    0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
    0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f,
    # 0xFDD0 to 0xFDEF
    0xfdd0, 0xfdd1, 0xfdd2, 0xfdd3, 0xfdd4, 0xfdd5, 0xfdd6, 0xfdd7, 0xfdd8,
    0xfdd9, 0xfdda, 0xfddb, 0xfddc, 0xfddd, 0xfdde, 0xfddf, 0xfde0, 0xfde1,
    0xfde2, 0xfde3, 0xfde4, 0xfde5, 0xfde6, 0xfde7, 0xfde8, 0xfde9, 0xfdea,
    0xfdeb, 0xfdec, 0xfded, 0xfdee, 0xfdef,
    # others
    0xb, 0xfffe, 0xffff, 0x1fffe, 0x1ffff, 0x2fffe, 0x2ffff, 0x3fffe, 0x3ffff,
    0x4fffe, 0x4ffff, 0x5fffe, 0x5ffff, 0x6fffe, 0x6ffff, 0x7fffe, 0x7ffff,
    0x8fffe, 0x8ffff, 0x9fffe, 0x9ffff, 0xafffe, 0xaffff, 0xbfffe, 0xbffff,
    0xcfffe, 0xcffff, 0xdfffe, 0xdffff, 0xefffe, 0xeffff, 0xffffe, 0xfffff,
    0x10fffe, 0x10ffff
}


def _replace_charref(s):
    s = s.group(1)
    if s[0] == '#':
        # numeric charref
        if s[1] in 'xX':
            num = int(s[2:].rstrip(';'), 16)
        else:
            num = int(s[1:].rstrip(';'))
        if num in _invalid_charrefs:
            return _invalid_charrefs[num]
        if 0xD800 <= num <= 0xDFFF or num > 0x10FFFF:
            return '\uFFFD'
        if num in _invalid_codepoints:
            return ''
        return chr(num)
    else:
        # named charref
        if s in _html5:
            return _html5[s]
        # find the longest matching name (as defined by the standard)
        for x in range(len(s)-1, 1, -1):
            if s[:x] in _html5:
                return _html5[s[:x]] + s[x:]
        else:
            return '&' + s


_charref = _re.compile(r'&(#[0-9]+;?'
                       r'|#[xX][0-9a-fA-F]+;?'
                       r'|[^\t\n\f <&#;]{1,32};?)')

def unescape(s):
    """
    Convert all named and numeric character references (e.g. &gt;, &#62;,
    &x3e;) in the string s to the corresponding unicode characters.
    This function uses the rules defined by the HTML 5 standard
    for both valid and invalid character references, and the list of
    HTML 5 named character references defined in html.entities.html5.
    """
    if '&' not in s:
        return s
    return _charref.sub(_replace_charref, s)

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