/usr/share/pyshared/mercurial/encoding.py is in mercurial-common 2.0.2-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 | # encoding.py - character transcoding support for Mercurial
#
# Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
import error
import unicodedata, locale, os
def _getpreferredencoding():
'''
On darwin, getpreferredencoding ignores the locale environment and
always returns mac-roman. http://bugs.python.org/issue6202 fixes this
for Python 2.7 and up. This is the same corrected code for earlier
Python versions.
However, we can't use a version check for this method, as some distributions
patch Python to fix this. Instead, we use it as a 'fixer' for the mac-roman
encoding, as it is unlikely that this encoding is the actually expected.
'''
try:
locale.CODESET
except AttributeError:
# Fall back to parsing environment variables :-(
return locale.getdefaultlocale()[1]
oldloc = locale.setlocale(locale.LC_CTYPE)
locale.setlocale(locale.LC_CTYPE, "")
result = locale.nl_langinfo(locale.CODESET)
locale.setlocale(locale.LC_CTYPE, oldloc)
return result
_encodingfixers = {
'646': lambda: 'ascii',
'ANSI_X3.4-1968': lambda: 'ascii',
'mac-roman': _getpreferredencoding
}
try:
encoding = os.environ.get("HGENCODING")
if not encoding:
encoding = locale.getpreferredencoding() or 'ascii'
encoding = _encodingfixers.get(encoding, lambda: encoding)()
except locale.Error:
encoding = 'ascii'
encodingmode = os.environ.get("HGENCODINGMODE", "strict")
fallbackencoding = 'ISO-8859-1'
class localstr(str):
'''This class allows strings that are unmodified to be
round-tripped to the local encoding and back'''
def __new__(cls, u, l):
s = str.__new__(cls, l)
s._utf8 = u
return s
def __hash__(self):
return hash(self._utf8) # avoid collisions in local string space
def tolocal(s):
"""
Convert a string from internal UTF-8 to local encoding
All internal strings should be UTF-8 but some repos before the
implementation of locale support may contain latin1 or possibly
other character sets. We attempt to decode everything strictly
using UTF-8, then Latin-1, and failing that, we use UTF-8 and
replace unknown characters.
The localstr class is used to cache the known UTF-8 encoding of
strings next to their local representation to allow lossless
round-trip conversion back to UTF-8.
>>> u = 'foo: \\xc3\\xa4' # utf-8
>>> l = tolocal(u)
>>> l
'foo: ?'
>>> fromlocal(l)
'foo: \\xc3\\xa4'
>>> u2 = 'foo: \\xc3\\xa1'
>>> d = { l: 1, tolocal(u2): 2 }
>>> d # no collision
{'foo: ?': 1, 'foo: ?': 2}
>>> 'foo: ?' in d
False
>>> l1 = 'foo: \\xe4' # historical latin1 fallback
>>> l = tolocal(l1)
>>> l
'foo: ?'
>>> fromlocal(l) # magically in utf-8
'foo: \\xc3\\xa4'
"""
for e in ('UTF-8', fallbackencoding):
try:
u = s.decode(e) # attempt strict decoding
r = u.encode(encoding, "replace")
if u == r.decode(encoding):
# r is a safe, non-lossy encoding of s
return r
elif e == 'UTF-8':
return localstr(s, r)
else:
return localstr(u.encode('UTF-8'), r)
except LookupError, k:
raise error.Abort("%s, please check your locale settings" % k)
except UnicodeDecodeError:
pass
u = s.decode("utf-8", "replace") # last ditch
return u.encode(encoding, "replace") # can't round-trip
def fromlocal(s):
"""
Convert a string from the local character encoding to UTF-8
We attempt to decode strings using the encoding mode set by
HGENCODINGMODE, which defaults to 'strict'. In this mode, unknown
characters will cause an error message. Other modes include
'replace', which replaces unknown characters with a special
Unicode character, and 'ignore', which drops the character.
"""
# can we do a lossless round-trip?
if isinstance(s, localstr):
return s._utf8
try:
return s.decode(encoding, encodingmode).encode("utf-8")
except UnicodeDecodeError, inst:
sub = s[max(0, inst.start - 10):inst.start + 10]
raise error.Abort("decoding near '%s': %s!" % (sub, inst))
except LookupError, k:
raise error.Abort("%s, please check your locale settings" % k)
# How to treat ambiguous-width characters. Set to 'wide' to treat as wide.
wide = (os.environ.get("HGENCODINGAMBIGUOUS", "narrow") == "wide"
and "WFA" or "WF")
def colwidth(s):
"Find the column width of a string for display in the local encoding"
return ucolwidth(s.decode(encoding, 'replace'))
def ucolwidth(d):
"Find the column width of a Unicode string for display"
eaw = getattr(unicodedata, 'east_asian_width', None)
if eaw is not None:
return sum([eaw(c) in wide and 2 or 1 for c in d])
return len(d)
def getcols(s, start, c):
'''Use colwidth to find a c-column substring of s starting at byte
index start'''
for x in xrange(start + c, len(s)):
t = s[start:x]
if colwidth(t) == c:
return t
def lower(s):
"best-effort encoding-aware case-folding of local string s"
try:
if isinstance(s, localstr):
u = s._utf8.decode("utf-8")
else:
u = s.decode(encoding, encodingmode)
lu = u.lower()
if u == lu:
return s # preserve localstring
return lu.encode(encoding)
except UnicodeError:
return s.lower() # we don't know how to fold this except in ASCII
except LookupError, k:
raise error.Abort(k, hint="please check your locale settings")
def upper(s):
"best-effort encoding-aware case-folding of local string s"
try:
if isinstance(s, localstr):
u = s._utf8.decode("utf-8")
else:
u = s.decode(encoding, encodingmode)
uu = u.upper()
if u == uu:
return s # preserve localstring
return uu.encode(encoding)
except UnicodeError:
return s.upper() # we don't know how to fold this except in ASCII
except LookupError, k:
raise error.Abort(k, hint="please check your locale settings")
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