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Can't parse POT files with plurals generated by xgettext #1154
Description
Overview Description
xgettext generates a plural-forms header with all-caps strings as placeholders:
Plural-Forms: nplurals=INTEGER; plural=EXPRESSION;\n
pofile.read_po chokes on these.
Steps to Reproduce
xgettext --output=- - --language=C <<<'ngettext("Hello World!", "Hello Worlds!", 3);' | python3 -c 'import sys; from babel.messages import pofile; pofile.read_po(sys.stdin)'
Actual Results
Traceback (most recent call last):
File "<string>", line 1, in <module>
File "/nix/store/wpv3wmn4j889lm2sabq8294vap8gwmri-python3-3.11.10-env/lib/python3.11/site-packages/babel/messages/pofile.py", line 387, in read_po
parser.parse(fileobj)
File "/nix/store/wpv3wmn4j889lm2sabq8294vap8gwmri-python3-3.11.10-env/lib/python3.11/site-packages/babel/messages/pofile.py", line 310, in parse
self._process_comment(line)
File "/nix/store/wpv3wmn4j889lm2sabq8294vap8gwmri-python3-3.11.10-env/lib/python3.11/site-packages/babel/messages/pofile.py", line 269, in _process_comment
self._finish_current_message()
File "/nix/store/wpv3wmn4j889lm2sabq8294vap8gwmri-python3-3.11.10-env/lib/python3.11/site-packages/babel/messages/pofile.py", line 206, in _finish_current_message
self._add_message()
File "/nix/store/wpv3wmn4j889lm2sabq8294vap8gwmri-python3-3.11.10-env/lib/python3.11/site-packages/babel/messages/pofile.py", line 200, in _add_message
self.catalog[msgid] = message
~~~~~~~~~~~~^^^^^^^
File "/nix/store/wpv3wmn4j889lm2sabq8294vap8gwmri-python3-3.11.10-env/lib/python3.11/site-packages/babel/messages/catalog.py", line 686, in __setitem__
self.mime_headers = message_from_string(message.string).items()
^^^^^^^^^^^^^^^^^
File "/nix/store/wpv3wmn4j889lm2sabq8294vap8gwmri-python3-3.11.10-env/lib/python3.11/site-packages/babel/messages/catalog.py", line 495, in _set_mime_headers
self._num_plurals = int(params.get('nplurals', 2))
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: invalid literal for int() with base 10: 'INTEGER'
Expected Results
Parsing the PO template successfully, even if the plural specification is invalid.
Reproducibility
Seems to be entirely deterministic.
Activity
Allow passthrough of xgettext's plural templates