/usr/lib/python3/dist-packages/aeidon/encodings.py is in python3-aeidon 1.3.1-1.
This file is owned by root:root, with mode 0o644.
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# Copyright (C) 2005 Osmo Salomaa
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
"""
Codes, names and descriptions of character encodings.
For functions dealing with character encodings, see also :mod:`aeidon.util`.
"""
import aeidon
import codecs
import locale
import re
from aeidon.i18n import _
# Tuples of code, name and description for each supported character encoding.
# Codes are the official names used by Python. Names are mostly taken from
# IANA. Descriptions are mostly copied from gedit.
_encodings = (
# TRANSLATORS: Most of the character encoding descriptions are copied from
# gedit, which is translated to very many languages. Check the gedit .po
# files for a reference: <http://git.gnome.org/browse/gedit/tree/po/>.
("ascii" , "US-ASCII" , _("English")),
("big5" , "Big5" , _("Chinese traditional")),
("big5hkscs" , "Big5-HKSCS" , _("Chinese traditional")),
("cp037" , "IBM037" , _("English")),
("cp273" , "IBM273" , _("German")),
("cp424" , "IBM242" , _("Hebrew")),
("cp437" , "IBM437" , _("English")),
("cp500" , "IBM500" , _("Western")),
("cp720" , "IBM720" , _("Arabic")),
("cp737" , "IBM737" , _("Greek")),
("cp775" , "IBM775" , _("Baltic")),
("cp850" , "IBM850" , _("Western")),
("cp852" , "IBM852" , _("Central European")),
("cp855" , "IBM855" , _("Cyrillic")),
("cp856" , "IBM856" , _("Hebrew")),
("cp857" , "IBM857" , _("Turkish")),
("cp860" , "IBM860" , _("Portuguese")),
("cp861" , "IBM861" , _("Icelandic")),
("cp862" , "IBM862" , _("Hebrew")),
("cp863" , "IBM863" , _("Canadian")),
("cp864" , "IBM864" , _("Arabic")),
("cp865" , "IBM865" , _("Nordic")),
("cp866" , "IBM866" , _("Russian")),
("cp869" , "IBM869" , _("Greek")),
("cp874" , "IBM874" , _("Thai")),
("cp875" , "IBM875" , _("Greek")),
("cp932" , "IBM932" , _("Japanese")),
("cp949" , "IBM949" , _("Korean")),
("cp950" , "IBM950" , _("Chinese traditional")),
("cp1006" , "IBM1006" , _("Urdu")),
("cp1026" , "IBM1026" , _("Turkish")),
("cp1125" , "IBM1125" , _("Ukrainian")),
("cp1140" , "IBM1140" , _("Western")),
("cp1250" , "windows-1250" , _("Central European")),
("cp1251" , "windows-1251" , _("Cyrillic")),
("cp1252" , "windows-1252" , _("Western")),
("cp1253" , "windows-1253" , _("Greek")),
("cp1254" , "windows-1254" , _("Turkish")),
("cp1255" , "windows-1255" , _("Hebrew")),
("cp1256" , "windows-1256" , _("Arabic")),
("cp1257" , "windows-1257" , _("Baltic")),
("cp1258" , "windows-1258" , _("Vietnamese")),
("euc_jp" , "EUC-JP" , _("Japanese")),
("euc_jis_2004" , "EUC-JIS-2004" , _("Japanese")),
("euc_jisx0213" , "EUC-JISX0213" , _("Japanese")),
("euc_kr" , "EUC-KR" , _("Korean")),
("gb2312" , "GB2312" , _("Chinese simplified")),
("gbk" , "GBK" , _("Chinese unified")),
("gb18030" , "GB18030" , _("Chinese unified")),
("hz" , "HZ" , _("Chinese simplified")),
("iso2022_jp" , "ISO-2022-JP" , _("Japanese")),
("iso2022_jp_1" , "ISO-2022-JP-1" , _("Japanese")),
("iso2022_jp_2" , "ISO-2022-JP-2" , _("Japanese")),
("iso2022_jp_2004", "ISO-2022-JP-2004", _("Japanese")),
("iso2022_jp_3" , "ISO-2022-JP-3" , _("Japanese")),
("iso2022_jp_ext" , "ISO-2022-JP-EXT" , _("Japanese")),
("iso2022_kr" , "ISO-2022-KR" , _("Korean")),
("latin_1" , "ISO-8859-1" , _("Western")),
("iso8859_2" , "ISO-8859-2" , _("Central European")),
("iso8859_3" , "ISO-8859-3" , _("South European")),
("iso8859_4" , "ISO-8859-4" , _("Baltic")),
("iso8859_5" , "ISO-8859-5" , _("Cyrillic")),
("iso8859_6" , "ISO-8859-6" , _("Arabic")),
("iso8859_7" , "ISO-8859-7" , _("Greek")),
("iso8859_8" , "ISO-8859-8" , _("Hebrew")),
("iso8859_9" , "ISO-8859-9" , _("Turkish")),
("iso8859_10" , "ISO-8859-10" , _("Nordic")),
("iso8859_13" , "ISO-8859-13" , _("Baltic")),
("iso8859_14" , "ISO-8859-14" , _("Celtic")),
("iso8859_15" , "ISO-8859-15" , _("Western")),
("johab" , "Johab" , _("Korean")),
("koi8_r" , "KOI8-R" , _("Russian")),
("koi8_t" , "KOI8-T" , _("Tajik")),
("koi8_u" , "KOI8-U" , _("Ukrainian")),
("kz1048" , "KZ1048" , _("Kazakh")),
("mac_cyrillic" , "MacCyrillic" , _("Cyrillic")),
("mac_greek" , "MacGreek" , _("Greek")),
("mac_iceland" , "MacIceland" , _("Icelandic")),
("mac_latin2" , "MacCentralEurope", _("Central European")),
("mac_roman" , "MacRoman" , _("Western")),
("mac_turkish" , "MacTurkish" , _("Turkish")),
("ptcp154" , "PTCP154" , _("Cyrillic Asian")),
("shift_jis" , "Shift_JIS" , _("Japanese")),
("shift_jis_2004" , "Shift_JIS-2004" , _("Japanese")),
("shift_jisx0213" , "Shift_JISX0213" , _("Japanese")),
("utf_32" , "UTF-32" , _("Unicode")),
("utf_32_be" , "UTF-32BE" , _("Unicode")),
("utf_32_le" , "UTF-32LE" , _("Unicode")),
("utf_16" , "UTF-16" , _("Unicode")),
("utf_16_be" , "UTF-16BE" , _("Unicode")),
("utf_16_le" , "UTF-16LE" , _("Unicode")),
("utf_7" , "UTF-7" , _("Unicode")),
("utf_8" , "UTF-8" , _("Unicode")),
("utf_8_sig" , "UTF-8-SIG" , _("Unicode")),)
CODE, NAME, DESC = range(3)
# Illegal characters in encoding codes.
_re_illegal = re.compile(r"[^a-z0-9_]")
def code_to_description(code):
"""Convert encoding `code` to localized description."""
for item in _encodings:
if item[CODE] == code:
return item[DESC]
raise ValueError("Code {} not found"
.format(repr(code)))
def code_to_long_name(code):
"""Convert encoding `code` to localized long name."""
for item in _encodings:
if item[CODE] == code:
return (_("{description} ({name})")
.format(name=item[NAME],
description=item[DESC]))
raise ValueError("Code {} not found"
.format(repr(code)))
def code_to_name(code):
"""Convert encoding `code` to name."""
for item in _encodings:
if item[CODE] == code:
return item[NAME]
raise ValueError("Code {} not found"
.format(repr(code)))
def detect(path):
"""
Detect the encoding of file at `path` and return code or ``None``.
Raise :exc:`IOError` if reading fails.
"""
bom_encoding = detect_bom(path)
if bom_encoding is not None:
return bom_encoding
from chardet import universaldetector
detector = universaldetector.UniversalDetector()
with open(path, "rb") as f:
detector.reset()
for line in f:
detector.feed(line)
if detector.done: break
detector.close()
code = detector.result["encoding"]
if code is None: return None
try:
# chardet returns what seem to be IANA names. They need to be
# translated to their Python equivalents. Some of the encodings
# returned by chardet are not supported by Python.
return translate_code(code)
except ValueError:
return None
def detect_bom(path):
"""Return corresponding encoding if BOM found, else ``None``."""
with open(path, "rb") as f:
line = f.readline()
if (line.startswith(codecs.BOM_UTF32_BE) and
is_valid_code("utf_32_be")):
return "utf_32_be"
if (line.startswith(codecs.BOM_UTF32_LE) and
is_valid_code("utf_32_le")):
return "utf_32_le"
if (line.startswith(codecs.BOM_UTF8) and
is_valid_code("utf_8_sig")):
return "utf_8_sig"
if (line.startswith(codecs.BOM_UTF16_BE) and
is_valid_code("utf_16_be")):
return "utf_16_be"
if (line.startswith(codecs.BOM_UTF16_LE) and
is_valid_code("utf_16_le")):
return "utf_16_le"
return None
@aeidon.deco.once
def get_locale_code():
"""Return code of the locale encoding or ``None``."""
code = locale.getpreferredencoding()
if code is None: return None
code = _re_illegal.sub("_", code.lower())
code = aeidon.util.get_encoding_alias(code)
return code
@aeidon.deco.once
def get_locale_long_name():
"""Return localized long name for locale encoding."""
name = code_to_name(get_locale_code())
return _("Current locale ({})").format(name)
@aeidon.deco.once
def get_valid():
"""Return a list of code, name, description of valid encodings."""
valid_encodings = []
for i, item in enumerate(_encodings):
if is_valid_code(item[CODE]):
valid_encodings.append(item)
return valid_encodings
def is_valid_code(code):
"""Return ``True`` if encoding `code` is valid."""
try:
codecs.lookup(code)
return True
except LookupError:
return False
def name_to_code(name):
"""Convert encoding `name` to code."""
for item in _encodings:
if item[NAME] == name:
return item[CODE]
raise ValueError("Name {} not found"
.format(repr(name)))
def translate_code(code):
"""Return normalized encoding `code`."""
code = _re_illegal.sub("_", code.lower())
code = aeidon.util.get_encoding_alias(code)
for item in _encodings:
if item[CODE] == code:
return item[CODE]
raise ValueError("Code {} not found"
.format(repr(code)))
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