view mercurial/i18n.py @ 37052:8c3c47362934

wireproto: implement basic frame reading and processing We just implemented support for writing frames. Now let's implement support for reading them. The bulk of the new code is for a class that maintains the state of a server. Essentially, you construct an instance, feed frames to it, and it tells you what you should do next. The design is inspired by the "sans I/O" movement and the reactor pattern. We don't want to perform I/O or any major blocking event during frame ingestion because this arbitrarily limits ways that server pieces can be implemented. For example, it makes it much harder to swap in an alternate implementation based on asyncio or do crazy things like have requests dispatch to other processes. We do still implement readframe() which does I/O. But it is decoupled from the server reactor. And important parsing of frame headers is a standalone function. So I/O is only needed to obtain frame data. Because testing server-side ingest is useful and difficult on running servers, we create a new "debugreflect" endpoint that will echo back to the client what was received and how it was interpreted. This could be useful for a server admin, someone implementing a client. But immediately, it is useful for testing: we're able to demonstrate that frames are parsed correctly and turned into requests to run commands without having to implement command dispatch on the server! In addition, we implement Python level unit tests for the reactor. This is vastly more efficient than sending requests to the "debugreflect" endpoint and vastly more powerful for advanced testing. Differential Revision: https://phab.mercurial-scm.org/D2852
author Gregory Szorc <gregory.szorc@gmail.com>
date Wed, 14 Mar 2018 15:25:06 -0700
parents 5bc7ff103081
children 79dd61a4554f
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# i18n.py - internationalization support for mercurial
#
# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.

from __future__ import absolute_import

import gettext as gettextmod
import locale
import os
import sys

from . import (
    encoding,
    pycompat,
)

# modelled after templater.templatepath:
if getattr(sys, 'frozen', None) is not None:
    module = pycompat.sysexecutable
else:
    module = pycompat.fsencode(__file__)

try:
    unicode
except NameError:
    unicode = str

_languages = None
if (pycompat.iswindows
    and 'LANGUAGE' not in encoding.environ
    and 'LC_ALL' not in encoding.environ
    and 'LC_MESSAGES' not in encoding.environ
    and 'LANG' not in encoding.environ):
    # Try to detect UI language by "User Interface Language Management" API
    # if no locale variables are set. Note that locale.getdefaultlocale()
    # uses GetLocaleInfo(), which may be different from UI language.
    # (See http://msdn.microsoft.com/en-us/library/dd374098(v=VS.85).aspx )
    try:
        import ctypes
        langid = ctypes.windll.kernel32.GetUserDefaultUILanguage()
        _languages = [locale.windows_locale[langid]]
    except (ImportError, AttributeError, KeyError):
        # ctypes not found or unknown langid
        pass

_ugettext = None

def setdatapath(datapath):
    datapath = pycompat.fsdecode(datapath)
    localedir = os.path.join(datapath, r'locale')
    t = gettextmod.translation(r'hg', localedir, _languages, fallback=True)
    global _ugettext
    try:
        _ugettext = t.ugettext
    except AttributeError:
        _ugettext = t.gettext

_msgcache = {}  # encoding: {message: translation}

def gettext(message):
    """Translate message.

    The message is looked up in the catalog to get a Unicode string,
    which is encoded in the local encoding before being returned.

    Important: message is restricted to characters in the encoding
    given by sys.getdefaultencoding() which is most likely 'ascii'.
    """
    # If message is None, t.ugettext will return u'None' as the
    # translation whereas our callers expect us to return None.
    if message is None or not _ugettext:
        return message

    cache = _msgcache.setdefault(encoding.encoding, {})
    if message not in cache:
        if type(message) is unicode:
            # goofy unicode docstrings in test
            paragraphs = message.split(u'\n\n')
        else:
            paragraphs = [p.decode("ascii") for p in message.split('\n\n')]
        # Be careful not to translate the empty string -- it holds the
        # meta data of the .po file.
        u = u'\n\n'.join([p and _ugettext(p) or u'' for p in paragraphs])
        try:
            # encoding.tolocal cannot be used since it will first try to
            # decode the Unicode string. Calling u.decode(enc) really
            # means u.encode(sys.getdefaultencoding()).decode(enc). Since
            # the Python encoding defaults to 'ascii', this fails if the
            # translated string use non-ASCII characters.
            encodingstr = pycompat.sysstr(encoding.encoding)
            cache[message] = u.encode(encodingstr, "replace")
        except LookupError:
            # An unknown encoding results in a LookupError.
            cache[message] = message
    return cache[message]

def _plain():
    if ('HGPLAIN' not in encoding.environ
        and 'HGPLAINEXCEPT' not in encoding.environ):
        return False
    exceptions = encoding.environ.get('HGPLAINEXCEPT', '').strip().split(',')
    return 'i18n' not in exceptions

if _plain():
    _ = lambda message: message
else:
    _ = gettext