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# $Id: __init__.py 9030 2022-03-05 23:28:32Z milde $
# Author: David Goodger <goodger@python.org>
# Copyright: This module has been placed in the public domain.
# Internationalization details are documented in
# <https://docutils.sourceforge.io/docs/howto/i18n.html>.
"""
This package contains modules for language-dependent features of Docutils.
"""
__docformat__ = 'reStructuredText'
from importlib import import_module
from docutils.utils import normalize_language_tag
class LanguageImporter:
"""Import language modules.
When called with a BCP 47 language tag, instances return a module
with localisations from `docutils.languages` or the PYTHONPATH.
If there is no matching module, warn (if a `reporter` is passed)
and fall back to English.
"""
packages = ('docutils.languages.', '')
warn_msg = ('Language "%s" not supported: '
'Docutils-generated text will be in English.')
fallback = 'en'
# TODO: use a dummy module returning empty strings?, configurable?
def __init__(self):
self.cache = {}
def import_from_packages(self, name, reporter=None):
"""Try loading module `name` from `self.packages`."""
module = None
for package in self.packages:
try:
module = import_module(package+name)
self.check_content(module)
except (ImportError, AttributeError):
if reporter and module:
reporter.info(f'{module} is no complete '
'Docutils language module.')
elif reporter:
reporter.info(f'Module "{package+name}" not found.')
continue
break
return module
def check_content(self, module):
"""Check if we got a Docutils language module."""
if not (isinstance(module.labels, dict)
and isinstance(module.bibliographic_fields, dict)
and isinstance(module.author_separators, list)):
raise ImportError
def __call__(self, language_code, reporter=None):
try:
return self.cache[language_code]
except KeyError:
pass
for tag in normalize_language_tag(language_code):
tag = tag.replace('-', '_') # '-' not valid in module names
module = self.import_from_packages(tag, reporter)
if module is not None:
break
else:
if reporter:
reporter.warning(self.warn_msg % language_code)
if self.fallback:
module = self.import_from_packages(self.fallback)
if reporter and (language_code != 'en'):
reporter.info('Using %s for language "%s".'
% (module, language_code))
self.cache[language_code] = module
return module
get_language = LanguageImporter()
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