76 lines
2.8 KiB
Python
76 lines
2.8 KiB
Python
# encoding.py - character transcoding support for Mercurial
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#
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# Copyright 2005-2009 Matt Mackall <mpm@selenic.com> and others
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2, incorporated herein by reference.
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import error
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import sys, unicodedata, locale, os
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_encodingfixup = {'646': 'ascii', 'ANSI_X3.4-1968': 'ascii'}
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try:
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encoding = os.environ.get("HGENCODING")
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if sys.platform == 'darwin' and not encoding:
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# On darwin, getpreferredencoding ignores the locale environment and
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# always returns mac-roman. We override this if the environment is
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# not C (has been customized by the user).
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locale.setlocale(locale.LC_CTYPE, '')
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encoding = locale.getlocale()[1]
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if not encoding:
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encoding = locale.getpreferredencoding() or 'ascii'
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encoding = _encodingfixup.get(encoding, encoding)
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except locale.Error:
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encoding = 'ascii'
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encodingmode = os.environ.get("HGENCODINGMODE", "strict")
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fallbackencoding = 'ISO-8859-1'
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def tolocal(s):
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"""
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Convert a string from internal UTF-8 to local encoding
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All internal strings should be UTF-8 but some repos before the
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implementation of locale support may contain latin1 or possibly
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other character sets. We attempt to decode everything strictly
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using UTF-8, then Latin-1, and failing that, we use UTF-8 and
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replace unknown characters.
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"""
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for e in ('UTF-8', fallbackencoding):
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try:
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u = s.decode(e) # attempt strict decoding
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return u.encode(encoding, "replace")
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except LookupError, k:
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raise error.Abort("%s, please check your locale settings" % k)
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except UnicodeDecodeError:
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pass
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u = s.decode("utf-8", "replace") # last ditch
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return u.encode(encoding, "replace")
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def fromlocal(s):
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"""
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Convert a string from the local character encoding to UTF-8
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We attempt to decode strings using the encoding mode set by
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HGENCODINGMODE, which defaults to 'strict'. In this mode, unknown
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characters will cause an error message. Other modes include
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'replace', which replaces unknown characters with a special
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Unicode character, and 'ignore', which drops the character.
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"""
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try:
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return s.decode(encoding, encodingmode).encode("utf-8")
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except UnicodeDecodeError, inst:
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sub = s[max(0, inst.start-10):inst.start+10]
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raise error.Abort("decoding near '%s': %s!" % (sub, inst))
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except LookupError, k:
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raise error.Abort("%s, please check your locale settings" % k)
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def colwidth(s):
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"Find the column width of a UTF-8 string for display"
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d = s.decode(encoding, 'replace')
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if hasattr(unicodedata, 'east_asian_width'):
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w = unicodedata.east_asian_width
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return sum([w(c) in 'WF' and 2 or 1 for c in d])
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return len(d)
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