mirror of
https://github.com/python/cpython.git
synced 2025-10-31 05:31:20 +00:00
132 lines
4.6 KiB
Python
132 lines
4.6 KiB
Python
"""
|
|
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("&", "&") # Must be done first!
|
|
s = s.replace("<", "<")
|
|
s = s.replace(">", ">")
|
|
if quote:
|
|
s = s.replace('"', """)
|
|
s = s.replace('\'', "'")
|
|
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. >, >,
|
|
&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)
|