mirror of
https://github.com/facebook/sapling.git
synced 2024-10-10 16:57:49 +03:00
0bc787c4c0
Summary: This module previously used to handle deciding how a particular module should be imported if it had multiple versions (e.g., pure Python or native). However, as of D18819680 it was changed to always import the native C version. Lets go ahead and remove it entirely now. Using `policy.importmod` simply makes it harder for type checkers to figure out the actual module that will be used. The only functionality that `policy.importmod()` still provided was verifying that the module contained a "version" field that looked like what was expected. In practice these version numbers are not bumped often, so this doesn't really seem to provide much value in checking that we imported the correct version that we expected to be shipped with this release. Reviewed By: xavierd Differential Revision: D19958227 fbshipit-source-id: 05f1d027d0a41cf99c4aa93cb84a51e830305077
672 lines
20 KiB
Python
672 lines
20 KiB
Python
# Portions Copyright (c) Facebook, Inc. and its affiliates.
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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.
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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, print_function
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import io
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import locale
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import os
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import sys
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import unicodedata
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from edenscmnative import parsers as charencode
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from . import error, pycompat
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from .pure import charencode as charencodepure
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from .pycompat import range
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isasciistr = charencode.isasciistr
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asciilower = charencode.asciilower
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asciiupper = charencode.asciiupper
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_jsonescapeu8fast = charencode.jsonescapeu8fast
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if sys.version_info[0] >= 3:
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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 = [
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unichr(int(x, 16)).encode("utf-8")
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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"
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).split()
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]
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# verify the next function will work
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assert all(i.startswith((b"\xe2", b"\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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def setfromenviron():
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"""Reset encoding states from environment variables"""
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global encoding, outputencoding, encodingmode, environ, _wide
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environ = os.environ # re-exports
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try:
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encoding = os.environ.get("HGENCODING")
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if not encoding:
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encoding = locale.getpreferredencoding() 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 = os.environ.get("HGENCODINGMODE", "strict")
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if encoding == "ascii":
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encoding = "utf-8"
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# How to treat ambiguous-width characters. Set to 'wide' to treat as wide.
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_wide = os.environ.get("HGENCODINGAMBIGUOUS", "narrow") == "wide" and "WFA" or "WF"
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outputencoding = os.environ.get("HGOUTPUTENCODING")
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if outputencoding == "ascii":
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outputencoding = "utf-8"
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# On Windows the outputencoding will be set to the OEM code page by the
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# windows module when it is loaded.
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_encodingfixers = {"646": lambda: "ascii", "ANSI_X3.4-1968": lambda: "ascii"}
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# cp65001 is a Windows variant of utf-8, which isn't supported on Python 2.
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# No idea if it should be rewritten to the canonical name 'utf-8' on Python 3.
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# https://bugs.python.org/issue13216
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if pycompat.iswindows and sys.version_info[0] < 3:
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_encodingfixers["cp65001"] = lambda: "utf-8"
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environ = encoding = outputencoding = encodingmode = _wide = None
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setfromenviron()
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fallbackencoding = "ISO-8859-1"
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class localstr(bytes):
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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 = bytes.__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 _setascii():
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"""Set encoding to ascii. Used by some doctests."""
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global encoding
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encoding = "ascii"
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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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>>> _setascii()
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>>> u = b'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 = b'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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>>> b'foo: ?' in d
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False
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>>> l1 = b'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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if isasciistr(s):
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return s
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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(encoding, u"replace")
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if u == r.decode(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(fallbackencoding)
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r = u.encode(encoding, u"replace")
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if u == r.decode(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(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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if isasciistr(s):
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return s
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try:
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u = s.decode(encoding, 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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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 sys.version_info[0] >= 3:
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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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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(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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if eaw is not None:
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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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index start"""
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for x in range(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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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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If 'leftside' is True, left side of string 's' is trimmed.
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'ellipsis' is always placed at trimmed side.
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>>> from .node import bin
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>>> def bprint(s):
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... print(s)
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>>> ellipsis = b'+++'
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>>> from . import encoding
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>>> encoding.encoding = b'utf-8'
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>>> t = b'1234567890'
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>>> bprint(trim(t, 12, ellipsis=ellipsis))
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1234567890
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>>> bprint(trim(t, 10, ellipsis=ellipsis))
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1234567890
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>>> bprint(trim(t, 8, ellipsis=ellipsis))
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12345+++
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>>> bprint(trim(t, 8, ellipsis=ellipsis, leftside=True))
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+++67890
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>>> bprint(trim(t, 8))
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12345678
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>>> bprint(trim(t, 8, leftside=True))
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34567890
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>>> bprint(trim(t, 3, ellipsis=ellipsis))
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+++
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>>> bprint(trim(t, 1, ellipsis=ellipsis))
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+
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>>> u = u'\u3042\u3044\u3046\u3048\u304a' # 2 x 5 = 10 columns
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>>> t = u.encode(encoding.encoding)
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>>> bprint(trim(t, 12, ellipsis=ellipsis))
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\xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a
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>>> bprint(trim(t, 10, ellipsis=ellipsis))
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\xe3\x81\x82\xe3\x81\x84\xe3\x81\x86\xe3\x81\x88\xe3\x81\x8a
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>>> bprint(trim(t, 8, ellipsis=ellipsis))
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\xe3\x81\x82\xe3\x81\x84+++
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>>> bprint(trim(t, 8, ellipsis=ellipsis, leftside=True))
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+++\xe3\x81\x88\xe3\x81\x8a
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>>> bprint(trim(t, 5))
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\xe3\x81\x82\xe3\x81\x84
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>>> bprint(trim(t, 5, leftside=True))
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\xe3\x81\x88\xe3\x81\x8a
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>>> bprint(trim(t, 4, ellipsis=ellipsis))
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+++
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>>> bprint(trim(t, 4, ellipsis=ellipsis, leftside=True))
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+++
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>>> t = bin(b'112233445566778899aa') # invalid byte sequence
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>>> bprint(trim(t, 12, ellipsis=ellipsis))
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\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa
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>>> bprint(trim(t, 10, ellipsis=ellipsis))
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\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa
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>>> bprint(trim(t, 8, ellipsis=ellipsis))
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\x11\x22\x33\x44\x55+++
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>>> bprint(trim(t, 8, ellipsis=ellipsis, leftside=True))
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+++\x66\x77\x88\x99\xaa
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>>> bprint(trim(t, 8))
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\x11\x22\x33\x44\x55\x66\x77\x88
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>>> bprint(trim(t, 8, leftside=True))
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\x33\x44\x55\x66\x77\x88\x99\xaa
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>>> bprint(trim(t, 3, ellipsis=ellipsis))
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+++
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>>> bprint(trim(t, 1, ellipsis=ellipsis))
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+
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"""
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try:
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if sys.version_info.major == 3:
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u = s
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else:
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u = s.decode(encoding)
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except UnicodeDecodeError:
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if len(s) <= width: # trimming is not needed
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return s
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width -= len(ellipsis)
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if width <= 0: # no enough room even for ellipsis
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return ellipsis[: width + len(ellipsis)]
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if leftside:
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return ellipsis + s[-width:]
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return s[:width] + ellipsis
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if ucolwidth(u) <= width: # trimming is not needed
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return s
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width -= len(ellipsis)
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if width <= 0: # no enough room even for ellipsis
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return ellipsis[: width + len(ellipsis)]
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if leftside:
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uslice = lambda i: u[i:]
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concat = lambda s: ellipsis + s
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else:
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uslice = lambda i: u[:-i]
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concat = lambda s: s + ellipsis
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for i in range(1, len(u)):
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usub = uslice(i)
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if ucolwidth(usub) <= width:
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return concat(usub.encode(encoding))
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return ellipsis # no enough room for multi-column characters
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def _lower(s):
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"best-effort encoding-aware case-folding of local string s"
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try:
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return asciilower(s)
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except UnicodeDecodeError:
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pass
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try:
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if isinstance(s, localstr):
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u = s._utf8.decode("utf-8")
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else:
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u = s.decode(encoding, encodingmode)
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lu = u.lower()
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if u == lu:
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return s # preserve localstring
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return lu.encode(encoding)
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except UnicodeError:
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return s.lower() # we don't know how to fold this except in ASCII
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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 _upper(s):
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"best-effort encoding-aware case-folding of local string s"
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try:
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return asciiupper(s)
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except UnicodeDecodeError:
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return upperfallback(s)
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def upperfallback(s):
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try:
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if isinstance(s, localstr):
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u = s._utf8.decode("utf-8")
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else:
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u = s.decode(encoding, encodingmode)
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uu = u.upper()
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if u == uu:
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return s # preserve localstring
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return uu.encode(encoding)
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except UnicodeError:
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return s.upper() # we don't know how to fold this except in ASCII
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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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class normcasespecs(object):
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"""what a platform's normcase does to ASCII strings
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This is specified per platform, and should be consistent with what normcase
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on that platform actually does.
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lower: normcase lowercases ASCII strings
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upper: normcase uppercases ASCII strings
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other: the fallback function should always be called
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This should be kept in sync with normcase_spec in util.h."""
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lower = -1
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upper = 1
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other = 0
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def jsonescape(s, paranoid=False):
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"""returns a string suitable for JSON
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JSON is problematic for us because it doesn't support non-Unicode
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bytes. To deal with this, we take the following approach:
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- localstr objects are converted back to UTF-8
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- valid UTF-8/ASCII strings are passed as-is
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- other strings are converted to UTF-8b surrogate encoding
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- apply JSON-specified string escaping
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(escapes are doubled in these tests)
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>>> jsonescape(b'this is a test')
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'this is a test'
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>>> jsonescape(b'escape characters: \\0 \\x0b \\x7f')
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'escape characters: \\\\u0000 \\\\u000b \\\\u007f'
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>>> jsonescape(b'escape characters: \\b \\t \\n \\f \\r \\" \\\\')
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'escape characters: \\\\b \\\\t \\\\n \\\\f \\\\r \\\\" \\\\\\\\'
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>>> jsonescape(b'a weird byte: \\xdd')
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'a weird byte: \\xed\\xb3\\x9d'
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>>> jsonescape(b'utf-8: caf\\xc3\\xa9')
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'utf-8: caf\\xc3\\xa9'
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>>> jsonescape(b'')
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''
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If paranoid, non-ascii and common troublesome characters are also escaped.
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This is suitable for web output.
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>>> s = b'escape characters: \\0 \\x0b \\x7f'
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>>> assert jsonescape(s) == jsonescape(s, paranoid=True)
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>>> s = b'escape characters: \\b \\t \\n \\f \\r \\" \\\\'
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>>> assert jsonescape(s) == jsonescape(s, paranoid=True)
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>>> jsonescape(b'escape boundary: \\x7e \\x7f \\xc2\\x80', paranoid=True)
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'escape boundary: ~ \\\\u007f \\\\u0080'
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>>> jsonescape(b'a weird byte: \\xdd', paranoid=True)
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'a weird byte: \\\\udcdd'
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>>> jsonescape(b'utf-8: caf\\xc3\\xa9', paranoid=True)
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'utf-8: caf\\\\u00e9'
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>>> jsonescape(b'non-BMP: \\xf0\\x9d\\x84\\x9e', paranoid=True)
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'non-BMP: \\\\ud834\\\\udd1e'
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>>> jsonescape(b'<foo@example.org>', paranoid=True)
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'\\\\u003cfoo@example.org\\\\u003e'
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"""
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u8chars = toutf8b(s)
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try:
|
|
return _jsonescapeu8fast(u8chars, paranoid)
|
|
except ValueError:
|
|
pass
|
|
return charencodepure.jsonescapeu8fallback(u8chars, paranoid)
|
|
|
|
|
|
# We need to decode/encode U+DCxx codes transparently since invalid UTF-8
|
|
# bytes are mapped to that range.
|
|
if sys.version_info[0] >= 3:
|
|
_utf8strict = r"surrogatepass"
|
|
else:
|
|
_utf8strict = r"strict"
|
|
|
|
_utf8len = [0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 4]
|
|
|
|
|
|
def getutf8char(s, pos):
|
|
"""get the next full utf-8 character in the given string, starting at pos
|
|
|
|
Raises a UnicodeError if the given location does not start a valid
|
|
utf-8 character.
|
|
"""
|
|
|
|
# find how many bytes to attempt decoding from first nibble
|
|
l = _utf8len[ord(s[pos : pos + 1]) >> 4]
|
|
if not l: # ascii
|
|
return s[pos : pos + 1]
|
|
|
|
c = s[pos : pos + l]
|
|
# validate with attempted decode
|
|
c.decode("utf-8", _utf8strict)
|
|
return c
|
|
|
|
|
|
def toutf8b(s):
|
|
"""convert a local, possibly-binary string into UTF-8b
|
|
|
|
This is intended as a generic method to preserve data when working
|
|
with schemes like JSON and XML that have no provision for
|
|
arbitrary byte strings. As Mercurial often doesn't know
|
|
what encoding data is in, we use so-called UTF-8b.
|
|
|
|
If a string is already valid UTF-8 (or ASCII), it passes unmodified.
|
|
Otherwise, unsupported bytes are mapped to UTF-16 surrogate range,
|
|
uDC00-uDCFF.
|
|
|
|
Principles of operation:
|
|
|
|
- ASCII and UTF-8 data successfully round-trips and is understood
|
|
by Unicode-oriented clients
|
|
- filenames and file contents in arbitrary other encodings can have
|
|
be round-tripped or recovered by clueful clients
|
|
- local strings that have a cached known UTF-8 encoding (aka
|
|
localstr) get sent as UTF-8 so Unicode-oriented clients get the
|
|
Unicode data they want
|
|
- because we must preserve UTF-8 bytestring in places such as
|
|
filenames, metadata can't be roundtripped without help
|
|
|
|
(Note: "UTF-8b" often refers to decoding a mix of valid UTF-8 and
|
|
arbitrary bytes into an internal Unicode format that can be
|
|
re-encoded back into the original. Here we are exposing the
|
|
internal surrogate encoding as a UTF-8 string.)
|
|
"""
|
|
|
|
if not isinstance(s, localstr) and isasciistr(s):
|
|
return s
|
|
if "\xed" not in s:
|
|
if isinstance(s, localstr):
|
|
return s._utf8
|
|
try:
|
|
s.decode("utf-8", _utf8strict)
|
|
return s
|
|
except UnicodeDecodeError:
|
|
pass
|
|
|
|
s = pycompat.bytestr(s)
|
|
r = ""
|
|
pos = 0
|
|
l = len(s)
|
|
while pos < l:
|
|
try:
|
|
c = getutf8char(s, pos)
|
|
if "\xed\xb0\x80" <= c <= "\xed\xb3\xbf":
|
|
# have to re-escape existing U+DCxx characters
|
|
c = unichr(0xDC00 + ord(s[pos])).encode("utf-8", _utf8strict)
|
|
pos += 1
|
|
else:
|
|
pos += len(c)
|
|
except UnicodeDecodeError:
|
|
c = unichr(0xDC00 + ord(s[pos])).encode("utf-8", _utf8strict)
|
|
pos += 1
|
|
r += c
|
|
return r
|
|
|
|
|
|
def fromutf8b(s):
|
|
"""Given a UTF-8b string, return a local, possibly-binary string.
|
|
|
|
return the original binary string. This
|
|
is a round-trip process for strings like filenames, but metadata
|
|
that's was passed through tolocal will remain in UTF-8.
|
|
|
|
>>> roundtrip = lambda x: fromutf8b(toutf8b(x)) == x
|
|
>>> m = b"\\xc3\\xa9\\x99abcd"
|
|
>>> toutf8b(m)
|
|
'\\xc3\\xa9\\xed\\xb2\\x99abcd'
|
|
>>> roundtrip(m)
|
|
True
|
|
>>> roundtrip(b"\\xc2\\xc2\\x80")
|
|
True
|
|
>>> roundtrip(b"\\xef\\xbf\\xbd")
|
|
True
|
|
>>> roundtrip(b"\\xef\\xef\\xbf\\xbd")
|
|
True
|
|
>>> roundtrip(b"\\xf1\\x80\\x80\\x80\\x80")
|
|
True
|
|
"""
|
|
|
|
if isasciistr(s):
|
|
return s
|
|
# fast path - look for uDxxx prefixes in s
|
|
if "\xed" not in s:
|
|
return s
|
|
|
|
# We could do this with the unicode type but some Python builds
|
|
# use UTF-16 internally (issue5031) which causes non-BMP code
|
|
# points to be escaped. Instead, we use our handy getutf8char
|
|
# helper again to walk the string without "decoding" it.
|
|
|
|
s = pycompat.bytestr(s)
|
|
r = ""
|
|
pos = 0
|
|
l = len(s)
|
|
while pos < l:
|
|
c = getutf8char(s, pos)
|
|
pos += len(c)
|
|
# unescape U+DCxx characters
|
|
if "\xed\xb0\x80" <= c <= "\xed\xb3\xbf":
|
|
c = pycompat.bytechr(ord(c.decode("utf-8", _utf8strict)) & 0xFF)
|
|
r += c
|
|
return r
|
|
|
|
|
|
if sys.version_info[0] >= 3:
|
|
|
|
# Prefer native unicode on Python
|
|
colwidth = ucolwidth
|
|
fromlocal = pycompat.identity
|
|
strfromlocal = pycompat.identity
|
|
strio = pycompat.identity
|
|
strmethod = pycompat.identity
|
|
strtolocal = pycompat.identity
|
|
tolocal = pycompat.identity
|
|
tolocalstr = pycompat.decodeutf8 # Binary utf-8 to Python 3 str
|
|
unifromlocal = pycompat.identity
|
|
unitolocal = pycompat.identity
|
|
|
|
def lower(s):
|
|
return s.lower()
|
|
|
|
def upper(s):
|
|
return s.upper()
|
|
|
|
|
|
else:
|
|
colwidth = _colwidth
|
|
fromlocal = _fromlocal
|
|
lower = _lower
|
|
strio = pycompat.identity
|
|
tolocal = _tolocal
|
|
tolocalstr = _tolocal # Binary utf-8 to local byte string
|
|
upper = _upper
|
|
|
|
|
|
if sys.version_info[0] < 3:
|
|
|
|
def localtooutput(s):
|
|
# type: (bytes) -> bytes
|
|
if outputencoding is not None and outputencoding != encoding:
|
|
try:
|
|
return fromlocal(s).decode("utf-8").encode(outputencoding, "replace")
|
|
except Exception:
|
|
pass
|
|
return s
|
|
|
|
|
|
else:
|
|
localtooutput = pycompat.identity
|