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import os
#: The environment variable that is consulted when this module
#: is imported to determine the value of `COMPILE_MO_FILES`.
#: Simply set this to a non-empty string to make it True.
COMPILE_MO_FILES_KEY = 'zope_i18n_compile_mo_files'
COMPILE_MO_FILES_UNSET = "__unset__"
#: Whether or not the ZCML directives will attempt to compile
#: translation files. Defaults to False.
COMPILE_MO_FILES = COMPILE_MO_FILES_UNSET
#: The environment variable that is consulted when this module
#: is imported to determine the value of `ALLOWED_LANGUAGES`.
#: If set, this should be a comma-separated list of language names.
ALLOWED_LANGUAGES_KEY = 'zope_i18n_allowed_languages'
def _parse_languages(value):
"""
Utility function to parse languages.
>>> _parse_languages(None) is None
True
>>> _parse_languages("en") == frozenset(('en',))
True
>>> _parse_languages('')
''
>>> _parse_languages("en,es") == frozenset(('en', 'es'))
True
Leading, trailing and internal whitespace is ignored:
>>> _parse_languages('en, es') == frozenset(('en', 'es'))
True
>>> _parse_languages(" en,es") == frozenset(('en', 'es'))
True
>>> _parse_languages("en,es ") == frozenset(('en', 'es'))
True
"""
if value:
value = value.replace(",", " ")
value = frozenset(value.split())
return value
#: A set of languages that `zope.i18n.negotiate` will pass to the
#: `zope.i18n.interfaces.INegotiator` utility. If this is None,
#: no utility will be used.
ALLOWED_LANGUAGES = _parse_languages(
os.environ.get(ALLOWED_LANGUAGES_KEY, None))
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