mirror of
https://github.com/SickGear/SickGear.git
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138 lines
3.6 KiB
Python
138 lines
3.6 KiB
Python
"""
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Functions to manage internationalisation (i18n):
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- initLocale(): setup locales and install Unicode compatible stdout and
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stderr ;
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- getTerminalCharset(): guess terminal charset ;
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WARNING: Loading this module indirectly calls initLocale() which sets
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locale LC_ALL to ''. This is needed to get user preferred locale
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settings.
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"""
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import locale
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import sys
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from codecs import BOM_UTF8, BOM_UTF16_LE, BOM_UTF16_BE
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def _getTerminalCharset():
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"""
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Function used by getTerminalCharset() to get terminal charset.
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@see getTerminalCharset()
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"""
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# (1) Try locale.getpreferredencoding()
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try:
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charset = locale.getpreferredencoding()
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if charset:
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return charset
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except (locale.Error, AttributeError):
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pass
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# (2) Try locale.nl_langinfo(CODESET)
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try:
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charset = locale.nl_langinfo(locale.CODESET)
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if charset:
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return charset
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except (locale.Error, AttributeError):
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pass
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# (3) Try sys.stdout.encoding
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if hasattr(sys.stdout, "encoding") and sys.stdout.encoding:
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return sys.stdout.encoding
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# (4) Otherwise, returns "ASCII"
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return "ASCII"
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def getTerminalCharset():
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"""
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Guess terminal charset using differents tests:
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1. Try locale.getpreferredencoding()
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2. Try locale.nl_langinfo(CODESET)
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3. Try sys.stdout.encoding
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4. Otherwise, returns "ASCII"
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WARNING: Call initLocale() before calling this function.
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"""
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try:
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return getTerminalCharset.value
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except AttributeError:
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getTerminalCharset.value = _getTerminalCharset()
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return getTerminalCharset.value
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def initLocale():
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# Only initialize locale once
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if initLocale.is_done:
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return
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initLocale.is_done = True
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# Setup locales
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try:
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locale.setlocale(locale.LC_ALL, "")
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except (locale.Error, IOError):
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pass
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initLocale.is_done = False
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UTF_BOMS = (
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(BOM_UTF8, "UTF-8"),
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(BOM_UTF16_LE, "UTF-16-LE"),
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(BOM_UTF16_BE, "UTF-16-BE"),
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)
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# Set of valid characters for specific charset
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CHARSET_CHARACTERS = (
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# U+00E0: LATIN SMALL LETTER A WITH GRAVE
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(set("©®éêè\xE0ç".encode("ISO-8859-1")), "ISO-8859-1"),
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(set("©®éêè\xE0ç€".encode("ISO-8859-15")), "ISO-8859-15"),
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(set("©®".encode("MacRoman")), "MacRoman"),
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(set("εδηιθκμοΡσςυΈί".encode("ISO-8859-7")), "ISO-8859-7"),
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)
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def guessBytesCharset(data, default=None):
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r"""
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>>> guessBytesCharset(b"abc")
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'ASCII'
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>>> guessBytesCharset(b"\xEF\xBB\xBFabc")
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'UTF-8'
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>>> guessBytesCharset(b"abc\xC3\xA9")
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'UTF-8'
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>>> guessBytesCharset(b"File written by Adobe Photoshop\xA8 4.0\0")
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'MacRoman'
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>>> guessBytesCharset(b"\xE9l\xE9phant")
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'ISO-8859-1'
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>>> guessBytesCharset(b"100 \xA4")
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'ISO-8859-15'
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>>> guessBytesCharset(b'Word \xb8\xea\xe4\xef\xf3\xe7'
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... b' - Microsoft Outlook 97'
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... b' - \xd1\xf5\xe8\xec\xdf\xf3\xe5\xe9\xf2 e-mail')
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'ISO-8859-7'
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"""
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# Check for UTF BOM
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for bom_bytes, charset in UTF_BOMS:
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if data.startswith(bom_bytes):
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return charset
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# Pure ASCII?
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try:
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data.decode('ascii', 'strict')
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return 'ASCII'
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except UnicodeDecodeError:
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pass
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# Valid UTF-8?
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try:
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data.decode('utf-8', 'strict')
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return 'UTF-8'
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except UnicodeDecodeError:
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pass
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# Create a set of non-ASCII characters
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non_ascii_set = set(byte for byte in data if byte >= 128)
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for characters, charset in CHARSET_CHARACTERS:
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if characters.issuperset(non_ascii_set):
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return charset
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return default
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