encoding.py
97 lines
| 3.4 KiB
| text/x-python
|
PythonLexer
/ mercurial / encoding.py
|
r8226 | # 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 | ||||
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r10263 | # GNU General Public License version 2 or any later version. | ||
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r7948 | |||
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r8312 | import error | ||
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r12062 | import unicodedata, locale, os | ||
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r7948 | |||
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r11892 | 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. | ||||
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r12770 | However, we can't use a version check for this method, as some distributions | ||
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r11892 | 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 | ||||
} | ||||
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r7948 | |||
try: | ||||
encoding = os.environ.get("HGENCODING") | ||||
if not encoding: | ||||
encoding = locale.getpreferredencoding() or 'ascii' | ||||
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r11892 | encoding = _encodingfixers.get(encoding, lambda: encoding)() | ||
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r7948 | except locale.Error: | ||
encoding = 'ascii' | ||||
encodingmode = os.environ.get("HGENCODINGMODE", "strict") | ||||
fallbackencoding = 'ISO-8859-1' | ||||
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. | ||||
""" | ||||
for e in ('UTF-8', fallbackencoding): | ||||
try: | ||||
u = s.decode(e) # attempt strict decoding | ||||
return u.encode(encoding, "replace") | ||||
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") | ||||
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. | ||||
""" | ||||
try: | ||||
return s.decode(encoding, encodingmode).encode("utf-8") | ||||
except UnicodeDecodeError, inst: | ||||
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r10282 | sub = s[max(0, inst.start - 10):inst.start + 10] | ||
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r7948 | raise error.Abort("decoding near '%s': %s!" % (sub, inst)) | ||
except LookupError, k: | ||||
raise error.Abort("%s, please check your locale settings" % k) | ||||
def colwidth(s): | ||||
"Find the column width of a UTF-8 string for display" | ||||
d = s.decode(encoding, 'replace') | ||||
if hasattr(unicodedata, 'east_asian_width'): | ||||
w = unicodedata.east_asian_width | ||||
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r11297 | return sum([w(c) in 'WFA' and 2 or 1 for c in d]) | ||
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r7948 | return len(d) | ||