mercurial/encoding.py
author Pulkit Goyal <7895pulkit@gmail.com>
Sat, 24 Jun 2017 19:55:01 +0530
changeset 33104 d170f59f6f55
parent 33038 ce96efec8112
child 33782 f5fc54e7e467
permissions -rw-r--r--
py3: fix kwargs handling for `hg bookmarks`
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# 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 or any later version.
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from __future__ import absolute_import
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import array
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import locale
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import os
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import unicodedata
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from . import (
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    error,
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    policy,
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    pycompat,
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)
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_sysstr = pycompat.sysstr
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if pycompat.ispy3:
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    unichr = chr
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# These unicode characters are ignored by HFS+ (Apple Technote 1150,
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# "Unicode Subtleties"), so we need to ignore them in some places for
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# sanity.
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_ignore = [unichr(int(x, 16)).encode("utf-8") for x in
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           "200c 200d 200e 200f 202a 202b 202c 202d 202e "
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           "206a 206b 206c 206d 206e 206f feff".split()]
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# verify the next function will work
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assert all(i.startswith(("\xe2", "\xef")) for i in _ignore)
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def hfsignoreclean(s):
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    """Remove codepoints ignored by HFS+ from s.
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    >>> hfsignoreclean(u'.h\u200cg'.encode('utf-8'))
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    '.hg'
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    >>> hfsignoreclean(u'.h\ufeffg'.encode('utf-8'))
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    '.hg'
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    """
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    if "\xe2" in s or "\xef" in s:
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        for c in _ignore:
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            s = s.replace(c, '')
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    return s
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# encoding.environ is provided read-only, which may not be used to modify
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# the process environment
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_nativeenviron = (not pycompat.ispy3 or os.supports_bytes_environ)
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if not pycompat.ispy3:
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    environ = os.environ  # re-exports
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elif _nativeenviron:
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    environ = os.environb  # re-exports
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else:
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    # preferred encoding isn't known yet; use utf-8 to avoid unicode error
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    # and recreate it once encoding is settled
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    environ = dict((k.encode(u'utf-8'), v.encode(u'utf-8'))
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                   for k, v in os.environ.items())  # re-exports
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_encodingfixers = {
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    '646': lambda: 'ascii',
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    'ANSI_X3.4-1968': lambda: 'ascii',
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}
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try:
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    encoding = environ.get("HGENCODING")
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    if not encoding:
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        encoding = locale.getpreferredencoding().encode('ascii') or 'ascii'
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        encoding = _encodingfixers.get(encoding, lambda: encoding)()
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except locale.Error:
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    encoding = 'ascii'
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encodingmode = environ.get("HGENCODINGMODE", "strict")
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fallbackencoding = 'ISO-8859-1'
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class localstr(str):
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    '''This class allows strings that are unmodified to be
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    round-tripped to the local encoding and back'''
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    def __new__(cls, u, l):
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        s = str.__new__(cls, l)
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        s._utf8 = u
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        return s
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    def __hash__(self):
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        return hash(self._utf8) # avoid collisions in local string space
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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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    The localstr class is used to cache the known UTF-8 encoding of
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    strings next to their local representation to allow lossless
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    round-trip conversion back to UTF-8.
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    >>> u = 'foo: \\xc3\\xa4' # utf-8
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    >>> l = tolocal(u)
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    >>> l
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    'foo: ?'
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    >>> fromlocal(l)
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    'foo: \\xc3\\xa4'
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    >>> u2 = 'foo: \\xc3\\xa1'
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    >>> d = { l: 1, tolocal(u2): 2 }
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    >>> len(d) # no collision
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    2
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    >>> 'foo: ?' in d
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    False
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    >>> l1 = 'foo: \\xe4' # historical latin1 fallback
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    >>> l = tolocal(l1)
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    >>> l
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    'foo: ?'
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    >>> fromlocal(l) # magically in utf-8
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    'foo: \\xc3\\xa4'
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    """
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    try:
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        try:
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            # make sure string is actually stored in UTF-8
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            u = s.decode('UTF-8')
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            if encoding == 'UTF-8':
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                # fast path
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                return s
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            r = u.encode(_sysstr(encoding), u"replace")
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            if u == r.decode(_sysstr(encoding)):
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                # r is a safe, non-lossy encoding of s
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                return r
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            return localstr(s, r)
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        except UnicodeDecodeError:
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            # we should only get here if we're looking at an ancient changeset
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            try:
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                u = s.decode(_sysstr(fallbackencoding))
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                r = u.encode(_sysstr(encoding), u"replace")
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                if u == r.decode(_sysstr(encoding)):
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                    # r is a safe, non-lossy encoding of s
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                    return r
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                return localstr(u.encode('UTF-8'), r)
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            except UnicodeDecodeError:
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                u = s.decode("utf-8", "replace") # last ditch
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                # can't round-trip
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                return u.encode(_sysstr(encoding), u"replace")
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    except LookupError as k:
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        raise error.Abort(k, hint="please check your locale settings")
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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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    # can we do a lossless round-trip?
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    if isinstance(s, localstr):
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        return s._utf8
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    try:
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        u = s.decode(_sysstr(encoding), _sysstr(encodingmode))
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        return u.encode("utf-8")
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    except UnicodeDecodeError as 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 as k:
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        raise error.Abort(k, hint="please check your locale settings")
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def unitolocal(u):
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    """Convert a unicode string to a byte string of local encoding"""
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    return tolocal(u.encode('utf-8'))
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def unifromlocal(s):
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    """Convert a byte string of local encoding to a unicode string"""
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    return fromlocal(s).decode('utf-8')
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   179
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def unimethod(bytesfunc):
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    """Create a proxy method that forwards __unicode__() and __str__() of
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    Python 3 to __bytes__()"""
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    def unifunc(obj):
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        return unifromlocal(bytesfunc(obj))
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    return unifunc
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# converter functions between native str and byte string. use these if the
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# character encoding is not aware (e.g. exception message) or is known to
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# be locale dependent (e.g. date formatting.)
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if pycompat.ispy3:
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    strtolocal = unitolocal
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    strfromlocal = unifromlocal
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    strmethod = unimethod
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else:
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    strtolocal = pycompat.identity
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    strfromlocal = pycompat.identity
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    strmethod = pycompat.identity
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   198
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if not _nativeenviron:
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    # now encoding and helper functions are available, recreate the environ
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    # dict to be exported to other modules
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    environ = dict((tolocal(k.encode(u'utf-8')), tolocal(v.encode(u'utf-8')))
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                   for k, v in os.environ.items())  # re-exports
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# How to treat ambiguous-width characters. Set to 'wide' to treat as wide.
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_wide = _sysstr(environ.get("HGENCODINGAMBIGUOUS", "narrow") == "wide"
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                and "WFA" or "WF")
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   208
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def colwidth(s):
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    "Find the column width of a string for display in the local encoding"
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    return ucolwidth(s.decode(_sysstr(encoding), u'replace'))
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def ucolwidth(d):
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    "Find the column width of a Unicode string for display"
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    eaw = getattr(unicodedata, 'east_asian_width', None)
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   216
    if eaw is not None:
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   217
        return sum([eaw(c) in _wide and 2 or 1 for c in d])
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    return len(d)
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def getcols(s, start, c):
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    '''Use colwidth to find a c-column substring of s starting at byte
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   222
    index start'''
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    for x in xrange(start + c, len(s)):
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        t = s[start:x]
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        if colwidth(t) == c:
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            return t
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   227
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   228
def trim(s, width, ellipsis='', leftside=False):
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    """Trim string 's' to at most 'width' columns (including 'ellipsis').
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   230
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   231
    If 'leftside' is True, left side of string 's' is trimmed.
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   232
    'ellipsis' is always placed at trimmed side.
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   233
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   234
    >>> ellipsis = '+++'
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   235
    >>> from . import encoding
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   236
    >>> encoding.encoding = 'utf-8'
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   237
    >>> t= '1234567890'
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   238
    >>> print trim(t, 12, ellipsis=ellipsis)
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   239
    1234567890
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   240
    >>> print trim(t, 10, ellipsis=ellipsis)
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    1234567890
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   242
    >>> print trim(t, 8, ellipsis=ellipsis)
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   243
    12345+++
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   244
    >>> print trim(t, 8, ellipsis=ellipsis, leftside=True)
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   245
    +++67890
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   246
    >>> print trim(t, 8)
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   247
    12345678
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   248
    >>> print trim(t, 8, leftside=True)
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   249
    34567890
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   250
    >>> print trim(t, 3, ellipsis=ellipsis)
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   251
    +++
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   252
    >>> print trim(t, 1, ellipsis=ellipsis)
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   253
    +
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   254
    >>> u = u'\u3042\u3044\u3046\u3048\u304a' # 2 x 5 = 10 columns
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   255
    >>> t = u.encode(encoding.encoding)
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   256
    >>> print trim(t, 12, ellipsis=ellipsis)
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   257
    \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a
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   258
    >>> print trim(t, 10, ellipsis=ellipsis)
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   259
    \xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a
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   260
    >>> print trim(t, 8, ellipsis=ellipsis)
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   261
    \xe3\x81\x82\xe3\x81\x84+++
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   262
    >>> print trim(t, 8, ellipsis=ellipsis, leftside=True)
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diff changeset
   263
    +++\xe3\x81\x88\xe3\x81\x8a
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   264
    >>> print trim(t, 5)
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   265
    \xe3\x81\x82\xe3\x81\x84
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   266
    >>> print trim(t, 5, leftside=True)
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   267
    \xe3\x81\x88\xe3\x81\x8a
21856
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   268
    >>> print trim(t, 4, ellipsis=ellipsis)
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   269
    +++
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   270
    >>> print trim(t, 4, ellipsis=ellipsis, leftside=True)
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diff changeset
   271
    +++
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   272
    >>> t = '\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa' # invalid byte sequence
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   273
    >>> print trim(t, 12, ellipsis=ellipsis)
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   274
    \x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa
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   275
    >>> print trim(t, 10, ellipsis=ellipsis)
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   276
    \x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa
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   277
    >>> print trim(t, 8, ellipsis=ellipsis)
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   278
    \x11\x22\x33\x44\x55+++
21861
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   279
    >>> print trim(t, 8, ellipsis=ellipsis, leftside=True)
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   280
    +++\x66\x77\x88\x99\xaa
21856
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   281
    >>> print trim(t, 8)
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diff changeset
   282
    \x11\x22\x33\x44\x55\x66\x77\x88
21861
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diff changeset
   283
    >>> print trim(t, 8, leftside=True)
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   284
    \x33\x44\x55\x66\x77\x88\x99\xaa
21856
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   285
    >>> print trim(t, 3, ellipsis=ellipsis)
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   286
    +++
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   287
    >>> print trim(t, 1, ellipsis=ellipsis)
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diff changeset
   288
    +
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   289
    """
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   290
    try:
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   291
        u = s.decode(_sysstr(encoding))
21856
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   292
    except UnicodeDecodeError:
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   293
        if len(s) <= width: # trimming is not needed
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   294
            return s
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   295
        width -= len(ellipsis)
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diff changeset
   296
        if width <= 0: # no enough room even for ellipsis
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   297
            return ellipsis[:width + len(ellipsis)]
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   298
        if leftside:
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   299
            return ellipsis + s[-width:]
21856
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   300
        return s[:width] + ellipsis
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diff changeset
   301
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diff changeset
   302
    if ucolwidth(u) <= width: # trimming is not needed
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diff changeset
   303
        return s
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diff changeset
   304
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   305
    width -= len(ellipsis)
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diff changeset
   306
    if width <= 0: # no enough room even for ellipsis
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diff changeset
   307
        return ellipsis[:width + len(ellipsis)]
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diff changeset
   308
21861
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diff changeset
   309
    if leftside:
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diff changeset
   310
        uslice = lambda i: u[i:]
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diff changeset
   311
        concat = lambda s: ellipsis + s
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diff changeset
   312
    else:
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diff changeset
   313
        uslice = lambda i: u[:-i]
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diff changeset
   314
        concat = lambda s: s + ellipsis
21856
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diff changeset
   315
    for i in xrange(1, len(u)):
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diff changeset
   316
        usub = uslice(i)
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diff changeset
   317
        if ucolwidth(usub) <= width:
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   318
            return concat(usub.encode(_sysstr(encoding)))
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diff changeset
   319
    return ellipsis # no enough room for multi-column characters
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diff changeset
   320
22973
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diff changeset
   321
def _asciilower(s):
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   322
    '''convert a string to lowercase if ASCII
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   323
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   324
    Raises UnicodeDecodeError if non-ASCII characters are found.'''
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   325
    s.decode('ascii')
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   326
    return s.lower()
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diff changeset
   327
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   328
def asciilower(s):
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   329
    # delay importing avoids cyclic dependency around "parsers" in
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diff changeset
   330
    # pure Python build (util => i18n => encoding => parsers => util)
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diff changeset
   331
    parsers = policy.importmod(r'parsers')
22973
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diff changeset
   332
    impl = getattr(parsers, 'asciilower', _asciilower)
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diff changeset
   333
    global asciilower
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diff changeset
   334
    asciilower = impl
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diff changeset
   335
    return impl(s)
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diff changeset
   336
24578
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diff changeset
   337
def _asciiupper(s):
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   338
    '''convert a string to uppercase if ASCII
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   339
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   340
    Raises UnicodeDecodeError if non-ASCII characters are found.'''
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   341
    s.decode('ascii')
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   342
    return s.upper()
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   343
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   344
def asciiupper(s):
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   345
    # delay importing avoids cyclic dependency around "parsers" in
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diff changeset
   346
    # pure Python build (util => i18n => encoding => parsers => util)
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diff changeset
   347
    parsers = policy.importmod(r'parsers')
24578
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diff changeset
   348
    impl = getattr(parsers, 'asciiupper', _asciiupper)
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   349
    global asciiupper
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   350
    asciiupper = impl
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   351
    return impl(s)
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diff changeset
   352
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   353
def lower(s):
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   354
    "best-effort encoding-aware case-folding of local string s"
e38846a79a23 encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents: 13940
diff changeset
   355
    try:
22779
d9585dda63c3 encoding.lower: use fast ASCII lower
Siddharth Agarwal <sid0@fb.com>
parents: 22778
diff changeset
   356
        return asciilower(s)
17235
3745ae495ce5 encoding: use s.decode to trigger UnicodeDecodeError
Martin Geisler <mg@aragost.com>
parents: 16493
diff changeset
   357
    except UnicodeDecodeError:
16387
c481761033bd encoding: add fast-path for ASCII lowercase
Matt Mackall <mpm@selenic.com>
parents: 16274
diff changeset
   358
        pass
c481761033bd encoding: add fast-path for ASCII lowercase
Matt Mackall <mpm@selenic.com>
parents: 16274
diff changeset
   359
    try:
14069
e38846a79a23 encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents: 13940
diff changeset
   360
        if isinstance(s, localstr):
e38846a79a23 encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents: 13940
diff changeset
   361
            u = s._utf8.decode("utf-8")
e38846a79a23 encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents: 13940
diff changeset
   362
        else:
30033
02dbfaa6df0b py3: convert encoding name and mode to str
Yuya Nishihara <yuya@tcha.org>
parents: 30031
diff changeset
   363
            u = s.decode(_sysstr(encoding), _sysstr(encodingmode))
14069
e38846a79a23 encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents: 13940
diff changeset
   364
e38846a79a23 encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents: 13940
diff changeset
   365
        lu = u.lower()
e38846a79a23 encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents: 13940
diff changeset
   366
        if u == lu:
e38846a79a23 encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents: 13940
diff changeset
   367
            return s # preserve localstring
30033
02dbfaa6df0b py3: convert encoding name and mode to str
Yuya Nishihara <yuya@tcha.org>
parents: 30031
diff changeset
   368
        return lu.encode(_sysstr(encoding))
14069
e38846a79a23 encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents: 13940
diff changeset
   369
    except UnicodeError:
e38846a79a23 encoding: add an encoding-aware lower function
Matt Mackall <mpm@selenic.com>
parents: 13940
diff changeset
   370
        return s.lower() # we don't know how to fold this except in ASCII
25660
328739ea70c3 global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents: 24608
diff changeset
   371
    except LookupError as k:
15672
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   372
        raise error.Abort(k, hint="please check your locale settings")
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   373
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   374
def upper(s):
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   375
    "best-effort encoding-aware case-folding of local string s"
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   376
    try:
24578
ac08de78de7f encoding: use parsers.asciiupper when available
Siddharth Agarwal <sid0@fb.com>
parents: 23596
diff changeset
   377
        return asciiupper(s)
17236
9fb8312dbdbd encoding: add fast-path for ASCII uppercase.
Martin Geisler <mg@aragost.com>
parents: 17235
diff changeset
   378
    except UnicodeDecodeError:
24597
b4258d5a1600 encoding.upper: factor out fallback code
Siddharth Agarwal <sid0@fb.com>
parents: 24593
diff changeset
   379
        return upperfallback(s)
b4258d5a1600 encoding.upper: factor out fallback code
Siddharth Agarwal <sid0@fb.com>
parents: 24593
diff changeset
   380
b4258d5a1600 encoding.upper: factor out fallback code
Siddharth Agarwal <sid0@fb.com>
parents: 24593
diff changeset
   381
def upperfallback(s):
17236
9fb8312dbdbd encoding: add fast-path for ASCII uppercase.
Martin Geisler <mg@aragost.com>
parents: 17235
diff changeset
   382
    try:
15672
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   383
        if isinstance(s, localstr):
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   384
            u = s._utf8.decode("utf-8")
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   385
        else:
30033
02dbfaa6df0b py3: convert encoding name and mode to str
Yuya Nishihara <yuya@tcha.org>
parents: 30031
diff changeset
   386
            u = s.decode(_sysstr(encoding), _sysstr(encodingmode))
15672
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   387
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   388
        uu = u.upper()
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   389
        if u == uu:
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   390
            return s # preserve localstring
30033
02dbfaa6df0b py3: convert encoding name and mode to str
Yuya Nishihara <yuya@tcha.org>
parents: 30031
diff changeset
   391
        return uu.encode(_sysstr(encoding))
15672
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   392
    except UnicodeError:
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   393
        return s.upper() # we don't know how to fold this except in ASCII
25660
328739ea70c3 global: mass rewrite to use modern exception syntax
Gregory Szorc <gregory.szorc@gmail.com>
parents: 24608
diff changeset
   394
    except LookupError as k:
15672
2ebe3d0ce91d i18n: use encoding.lower/upper for encoding aware case folding
FUJIWARA Katsunori <foozy@lares.dti.ne.jp>
parents: 15143
diff changeset
   395
        raise error.Abort(k, hint="please check your locale settings")
16133
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   396
24593
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   397
class normcasespecs(object):
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   398
    '''what a platform's normcase does to ASCII strings
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   399
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   400
    This is specified per platform, and should be consistent with what normcase
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   401
    on that platform actually does.
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   402
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   403
    lower: normcase lowercases ASCII strings
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   404
    upper: normcase uppercases ASCII strings
24608
1c533e23ce95 util.h: define an enum for normcase specs
Siddharth Agarwal <sid0@fb.com>
parents: 24597
diff changeset
   405
    other: the fallback function should always be called
1c533e23ce95 util.h: define an enum for normcase specs
Siddharth Agarwal <sid0@fb.com>
parents: 24597
diff changeset
   406
1c533e23ce95 util.h: define an enum for normcase specs
Siddharth Agarwal <sid0@fb.com>
parents: 24597
diff changeset
   407
    This should be kept in sync with normcase_spec in util.h.'''
24593
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   408
    lower = -1
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   409
    upper = 1
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   410
    other = 0
f473a1fe5c7c encoding: define an enum that specifies what normcase does to ASCII strings
Siddharth Agarwal <sid0@fb.com>
parents: 24578
diff changeset
   411
28066
d1cc07123243 encoding: change jsonmap to a list indexed by code point
Yuya Nishihara <yuya@tcha.org>
parents: 27881
diff changeset
   412
_jsonmap = []
28508
3c6e94d0811c encoding: use range() instead of xrange()
Gregory Szorc <gregory.szorc@gmail.com>
parents: 28507
diff changeset
   413
_jsonmap.extend("\\u%04x" % x for x in range(32))
32205
6c0ae9683437 py3: use pycompat.bytechr instead of chr
Pulkit Goyal <7895pulkit@gmail.com>
parents: 31777
diff changeset
   414
_jsonmap.extend(pycompat.bytechr(x) for x in range(32, 127))
28068
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   415
_jsonmap.append('\\u007f')
28067
69a02b1e947c encoding: initialize jsonmap when module is loaded
Yuya Nishihara <yuya@tcha.org>
parents: 28066
diff changeset
   416
_jsonmap[0x09] = '\\t'
69a02b1e947c encoding: initialize jsonmap when module is loaded
Yuya Nishihara <yuya@tcha.org>
parents: 28066
diff changeset
   417
_jsonmap[0x0a] = '\\n'
69a02b1e947c encoding: initialize jsonmap when module is loaded
Yuya Nishihara <yuya@tcha.org>
parents: 28066
diff changeset
   418
_jsonmap[0x22] = '\\"'
69a02b1e947c encoding: initialize jsonmap when module is loaded
Yuya Nishihara <yuya@tcha.org>
parents: 28066
diff changeset
   419
_jsonmap[0x5c] = '\\\\'
69a02b1e947c encoding: initialize jsonmap when module is loaded
Yuya Nishihara <yuya@tcha.org>
parents: 28066
diff changeset
   420
_jsonmap[0x08] = '\\b'
69a02b1e947c encoding: initialize jsonmap when module is loaded
Yuya Nishihara <yuya@tcha.org>
parents: 28066
diff changeset
   421
_jsonmap[0x0c] = '\\f'
69a02b1e947c encoding: initialize jsonmap when module is loaded
Yuya Nishihara <yuya@tcha.org>
parents: 28066
diff changeset
   422
_jsonmap[0x0d] = '\\r'
28068
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   423
_paranoidjsonmap = _jsonmap[:]
28069
b2d24c2898f9 encoding: backport paranoid escaping from templatefilters.jsonescape()
Yuya Nishihara <yuya@tcha.org>
parents: 28068
diff changeset
   424
_paranoidjsonmap[0x3c] = '\\u003c'  # '<' (e.g. escape "</script>")
b2d24c2898f9 encoding: backport paranoid escaping from templatefilters.jsonescape()
Yuya Nishihara <yuya@tcha.org>
parents: 28068
diff changeset
   425
_paranoidjsonmap[0x3e] = '\\u003e'  # '>'
32205
6c0ae9683437 py3: use pycompat.bytechr instead of chr
Pulkit Goyal <7895pulkit@gmail.com>
parents: 31777
diff changeset
   426
_jsonmap.extend(pycompat.bytechr(x) for x in range(128, 256))
22426
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   427
28068
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   428
def jsonescape(s, paranoid=False):
22426
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   429
    '''returns a string suitable for JSON
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   430
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   431
    JSON is problematic for us because it doesn't support non-Unicode
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   432
    bytes. To deal with this, we take the following approach:
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   433
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   434
    - localstr objects are converted back to UTF-8
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   435
    - valid UTF-8/ASCII strings are passed as-is
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   436
    - other strings are converted to UTF-8b surrogate encoding
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   437
    - apply JSON-specified string escaping
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   438
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   439
    (escapes are doubled in these tests)
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   440
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   441
    >>> jsonescape('this is a test')
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   442
    'this is a test'
27881
ffa599f3f503 encoding: escape U+007F (DEL) character in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 27699
diff changeset
   443
    >>> jsonescape('escape characters: \\0 \\x0b \\x7f')
ffa599f3f503 encoding: escape U+007F (DEL) character in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 27699
diff changeset
   444
    'escape characters: \\\\u0000 \\\\u000b \\\\u007f'
ffa599f3f503 encoding: escape U+007F (DEL) character in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 27699
diff changeset
   445
    >>> jsonescape('escape characters: \\t \\n \\r \\" \\\\')
ffa599f3f503 encoding: escape U+007F (DEL) character in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 27699
diff changeset
   446
    'escape characters: \\\\t \\\\n \\\\r \\\\" \\\\\\\\'
22426
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   447
    >>> jsonescape('a weird byte: \\xdd')
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   448
    'a weird byte: \\xed\\xb3\\x9d'
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   449
    >>> jsonescape('utf-8: caf\\xc3\\xa9')
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   450
    'utf-8: caf\\xc3\\xa9'
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   451
    >>> jsonescape('')
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   452
    ''
28068
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   453
28069
b2d24c2898f9 encoding: backport paranoid escaping from templatefilters.jsonescape()
Yuya Nishihara <yuya@tcha.org>
parents: 28068
diff changeset
   454
    If paranoid, non-ascii and common troublesome characters are also escaped.
b2d24c2898f9 encoding: backport paranoid escaping from templatefilters.jsonescape()
Yuya Nishihara <yuya@tcha.org>
parents: 28068
diff changeset
   455
    This is suitable for web output.
28068
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   456
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   457
    >>> jsonescape('escape boundary: \\x7e \\x7f \\xc2\\x80', paranoid=True)
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   458
    'escape boundary: ~ \\\\u007f \\\\u0080'
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   459
    >>> jsonescape('a weird byte: \\xdd', paranoid=True)
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   460
    'a weird byte: \\\\udcdd'
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   461
    >>> jsonescape('utf-8: caf\\xc3\\xa9', paranoid=True)
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   462
    'utf-8: caf\\\\u00e9'
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   463
    >>> jsonescape('non-BMP: \\xf0\\x9d\\x84\\x9e', paranoid=True)
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   464
    'non-BMP: \\\\ud834\\\\udd1e'
28069
b2d24c2898f9 encoding: backport paranoid escaping from templatefilters.jsonescape()
Yuya Nishihara <yuya@tcha.org>
parents: 28068
diff changeset
   465
    >>> jsonescape('<foo@example.org>', paranoid=True)
b2d24c2898f9 encoding: backport paranoid escaping from templatefilters.jsonescape()
Yuya Nishihara <yuya@tcha.org>
parents: 28068
diff changeset
   466
    '\\\\u003cfoo@example.org\\\\u003e'
22426
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   467
    '''
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   468
28068
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   469
    if paranoid:
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   470
        jm = _paranoidjsonmap
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   471
    else:
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   472
        jm = _jsonmap
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   473
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   474
    u8chars = toutf8b(s)
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   475
    try:
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   476
        return ''.join(jm[x] for x in bytearray(u8chars))  # fast path
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   477
    except IndexError:
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   478
        pass
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   479
    # non-BMP char is represented as UTF-16 surrogate pair
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   480
    u16codes = array.array('H', u8chars.decode('utf-8').encode('utf-16'))
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   481
    u16codes.pop(0)  # drop BOM
9ece901f7a19 encoding: add option to escape non-ascii characters in JSON
Yuya Nishihara <yuya@tcha.org>
parents: 28067
diff changeset
   482
    return ''.join(jm[x] if x < 128 else '\\u%04x' % x for x in u16codes)
22426
f6b533e64ed6 encoding: add json escaping filter
Matt Mackall <mpm@selenic.com>
parents: 22425
diff changeset
   483
26875
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   484
_utf8len = [0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 4]
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   485
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   486
def getutf8char(s, pos):
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   487
    '''get the next full utf-8 character in the given string, starting at pos
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   488
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   489
    Raises a UnicodeError if the given location does not start a valid
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   490
    utf-8 character.
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   491
    '''
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   492
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   493
    # find how many bytes to attempt decoding from first nibble
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   494
    l = _utf8len[ord(s[pos]) >> 4]
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   495
    if not l: # ascii
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   496
        return s[pos]
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   497
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   498
    c = s[pos:pos + l]
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   499
    # validate with attempted decode
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   500
    c.decode("utf-8")
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   501
    return c
cf47bdb2183c encoding: add getutf8char helper
Matt Mackall <mpm@selenic.com>
parents: 25660
diff changeset
   502
16133
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   503
def toutf8b(s):
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   504
    '''convert a local, possibly-binary string into UTF-8b
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   505
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   506
    This is intended as a generic method to preserve data when working
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   507
    with schemes like JSON and XML that have no provision for
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   508
    arbitrary byte strings. As Mercurial often doesn't know
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   509
    what encoding data is in, we use so-called UTF-8b.
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   510
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   511
    If a string is already valid UTF-8 (or ASCII), it passes unmodified.
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   512
    Otherwise, unsupported bytes are mapped to UTF-16 surrogate range,
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   513
    uDC00-uDCFF.
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   514
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   515
    Principles of operation:
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   516
17424
e7cfe3587ea4 fix trivial spelling errors
Mads Kiilerich <mads@kiilerich.com>
parents: 17236
diff changeset
   517
    - ASCII and UTF-8 data successfully round-trips and is understood
16133
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   518
      by Unicode-oriented clients
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   519
    - filenames and file contents in arbitrary other encodings can have
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   520
      be round-tripped or recovered by clueful clients
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   521
    - local strings that have a cached known UTF-8 encoding (aka
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   522
      localstr) get sent as UTF-8 so Unicode-oriented clients get the
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   523
      Unicode data they want
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   524
    - because we must preserve UTF-8 bytestring in places such as
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   525
      filenames, metadata can't be roundtripped without help
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   526
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   527
    (Note: "UTF-8b" often refers to decoding a mix of valid UTF-8 and
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   528
    arbitrary bytes into an internal Unicode format that can be
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   529
    re-encoded back into the original. Here we are exposing the
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   530
    internal surrogate encoding as a UTF-8 string.)
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   531
    '''
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   532
26879
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   533
    if "\xed" not in s:
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   534
        if isinstance(s, localstr):
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   535
            return s._utf8
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   536
        try:
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   537
            s.decode('utf-8')
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   538
            return s
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   539
        except UnicodeDecodeError:
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   540
            pass
26878
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   541
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   542
    r = ""
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   543
    pos = 0
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   544
    l = len(s)
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   545
    while pos < l:
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   546
        try:
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   547
            c = getutf8char(s, pos)
26879
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   548
            if "\xed\xb0\x80" <= c <= "\xed\xb3\xbf":
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   549
                # have to re-escape existing U+DCxx characters
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   550
                c = unichr(0xdc00 + ord(s[pos])).encode('utf-8')
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   551
                pos += 1
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   552
            else:
a24b98f4e03c encoding: re-escape U+DCxx characters in toutf8b input (issue4927)
Matt Mackall <mpm@selenic.com>
parents: 26878
diff changeset
   553
                pos += len(c)
26878
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   554
        except UnicodeDecodeError:
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   555
            c = unichr(0xdc00 + ord(s[pos])).encode('utf-8')
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   556
            pos += 1
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   557
        r += c
d7e83f106459 encoding: use getutf8char in toutf8b
Matt Mackall <mpm@selenic.com>
parents: 26877
diff changeset
   558
    return r
16133
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   559
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   560
def fromutf8b(s):
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   561
    '''Given a UTF-8b string, return a local, possibly-binary string.
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   562
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   563
    return the original binary string. This
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   564
    is a round-trip process for strings like filenames, but metadata
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   565
    that's was passed through tolocal will remain in UTF-8.
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   566
26963
de5ae97ce9f4 encoding: extend test cases for utf8b
Matt Mackall <mpm@selenic.com>
parents: 26879
diff changeset
   567
    >>> roundtrip = lambda x: fromutf8b(toutf8b(x)) == x
16133
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   568
    >>> m = "\\xc3\\xa9\\x99abcd"
26963
de5ae97ce9f4 encoding: extend test cases for utf8b
Matt Mackall <mpm@selenic.com>
parents: 26879
diff changeset
   569
    >>> toutf8b(m)
16133
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   570
    '\\xc3\\xa9\\xed\\xb2\\x99abcd'
26963
de5ae97ce9f4 encoding: extend test cases for utf8b
Matt Mackall <mpm@selenic.com>
parents: 26879
diff changeset
   571
    >>> roundtrip(m)
de5ae97ce9f4 encoding: extend test cases for utf8b
Matt Mackall <mpm@selenic.com>
parents: 26879
diff changeset
   572
    True
de5ae97ce9f4 encoding: extend test cases for utf8b
Matt Mackall <mpm@selenic.com>
parents: 26879
diff changeset
   573
    >>> roundtrip("\\xc2\\xc2\\x80")
de5ae97ce9f4 encoding: extend test cases for utf8b
Matt Mackall <mpm@selenic.com>
parents: 26879
diff changeset
   574
    True
de5ae97ce9f4 encoding: extend test cases for utf8b
Matt Mackall <mpm@selenic.com>
parents: 26879
diff changeset
   575
    >>> roundtrip("\\xef\\xbf\\xbd")
de5ae97ce9f4 encoding: extend test cases for utf8b
Matt Mackall <mpm@selenic.com>
parents: 26879
diff changeset
   576
    True
de5ae97ce9f4 encoding: extend test cases for utf8b
Matt Mackall <mpm@selenic.com>
parents: 26879
diff changeset
   577
    >>> roundtrip("\\xef\\xef\\xbf\\xbd")
16133
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   578
    True
27699
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   579
    >>> roundtrip("\\xf1\\x80\\x80\\x80\\x80")
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   580
    True
16133
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   581
    '''
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   582
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   583
    # fast path - look for uDxxx prefixes in s
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   584
    if "\xed" not in s:
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   585
        return s
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   586
27699
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   587
    # We could do this with the unicode type but some Python builds
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   588
    # use UTF-16 internally (issue5031) which causes non-BMP code
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   589
    # points to be escaped. Instead, we use our handy getutf8char
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   590
    # helper again to walk the string without "decoding" it.
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   591
16133
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   592
    r = ""
27699
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   593
    pos = 0
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   594
    l = len(s)
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   595
    while pos < l:
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   596
        c = getutf8char(s, pos)
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   597
        pos += len(c)
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   598
        # unescape U+DCxx characters
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   599
        if "\xed\xb0\x80" <= c <= "\xed\xb3\xbf":
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   600
            c = chr(ord(c.decode("utf-8")) & 0xff)
c8d3392f76e1 encoding: handle UTF-16 internal limit with fromutf8b (issue5031)
Matt Mackall <mpm@selenic.com>
parents: 27356
diff changeset
   601
        r += c
16133
84c58da3a1f8 encoding: introduce utf8-b helpers
Matt Mackall <mpm@selenic.com>
parents: 15769
diff changeset
   602
    return r