Mercurial > hg
view mercurial/encoding.py @ 16040:c0b2986b37b8 stable
mq: fix secret description in help
author | Matt Mackall <mpm@selenic.com> |
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date | Mon, 30 Jan 2012 16:04:14 -0600 |
parents | afdf4f5bac61 |
children | 84c58da3a1f8 |
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# 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(k, hint="please check your locale settings") 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(k, hint="please check your locale settings") # 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")