python-babel
Can not initialize a catalog from a template with an empty string value for "Language" header
GNU gettext's xgettext and lingua's pot-create both create PO-template files containing a Language header with an empty string as its value ("Language: \n").
Babel does not seem to be able to handle this empty header and produces the error and stacktrace below.
Removing the Language header from the template file allows Babel to initialize the catalogs without issue.
- Babel 2.7.0
- lingua 4.13
- xgettext 0.19.8.1
- Python 3.6.8
python3 setup.py init_catalog --domain project --input src/project/locale/project.pot --output-file src/project/locale/en/LC_MESSAGES/project.po --locale en
running init_catalog
creating catalog src/project/locale/en/LC_MESSAGES/project.po based on src/project/locale/project.pot
Traceback (most recent call last):
File "setup.py", line 35, in <module>
_do_setup()
File "setup.py", line 30, in _do_setup
version=version,
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/setuptools/__init__.py", line 145, in setup
return distutils.core.setup(**attrs)
File "/usr/lib/python3.6/distutils/core.py", line 148, in setup
dist.run_commands()
File "/usr/lib/python3.6/distutils/dist.py", line 955, in run_commands
self.run_command(cmd)
File "/usr/lib/python3.6/distutils/dist.py", line 974, in run_command
cmd_obj.run()
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/messages/frontend.py", line 622, in run
catalog = read_po(infile, locale=self.locale)
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/messages/pofile.py", line 377, in read_po
parser.parse(fileobj)
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/messages/pofile.py", line 308, in parse
self._process_comment(line)
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/messages/pofile.py", line 267, in _process_comment
self._finish_current_message()
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/messages/pofile.py", line 204, in _finish_current_message
self._add_message()
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/messages/pofile.py", line 198, in _add_message
self.catalog[msgid] = message
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/messages/catalog.py", line 629, in __setitem__
self.mime_headers = _parse_header(message.string).items()
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/messages/catalog.py", line 430, in _set_mime_headers
self._set_locale(value)
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/messages/catalog.py", line 318, in _set_locale
self._locale = Locale.parse(locale)
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/core.py", line 268, in parse
parts = parse_locale(identifier, sep=sep)
File "/home/sinoroc/workspace/project/.tox/develop/lib/python3.6/site-packages/babel/core.py", line 1094, in parse_locale
raise ValueError('expected only letters, got %r' % lang)
ValueError: expected only letters, got ''
Looks like the Catalog used to represent the PO-template gets its locale rewritten once the parser reaches the Language header. An easy fix would be to simply ignore this header if a template is being processed.
This is a bit puzzling...
On one side: https://github.com/python-babel/babel/blob/2abad80c9f2fc70bde71f53ab8270ca950100595/babel/messages/frontend.py#L619-L622
On the other: https://github.com/python-babel/babel/blob/2abad80c9f2fc70bde71f53ab8270ca950100595/babel/messages/pofile.py#L328-L369 and https://github.com/python-babel/babel/blob/2abad80c9f2fc70bde71f53ab8270ca950100595/babel/messages/catalog.py#L242-L254