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cpython/Lib/test/support/i18n_helper.py

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import re
import subprocess
import sys
import unittest
from pathlib import Path
from test.support import REPO_ROOT, TEST_HOME_DIR, requires_subprocess
from test.test_tools import skip_if_missing
pygettext = Path(REPO_ROOT) / 'Tools' / 'i18n' / 'pygettext.py'
msgid_pattern = re.compile(r'msgid(.*?)(?:msgid_plural|msgctxt|msgstr)',
re.DOTALL)
msgid_string_pattern = re.compile(r'"((?:\\"|[^"])*)"')
def _generate_po_file(path, *, stdout_only=True):
res = subprocess.run([sys.executable, pygettext,
'--no-location', '-o', '-', path],
stdout=subprocess.PIPE, stderr=subprocess.PIPE,
text=True)
if stdout_only:
return res.stdout
return res
def _extract_msgids(po):
msgids = []
for msgid in msgid_pattern.findall(po):
msgid_string = ''.join(msgid_string_pattern.findall(msgid))
msgid_string = msgid_string.replace(r'\"', '"')
if msgid_string:
msgids.append(msgid_string)
return sorted(msgids)
def _get_snapshot_path(module_name):
return Path(TEST_HOME_DIR) / 'translationdata' / module_name / 'msgids.txt'
@requires_subprocess()
class TestTranslationsBase(unittest.TestCase):
def assertMsgidsEqual(self, module):
'''Assert that msgids extracted from a given module match a
snapshot.
'''
skip_if_missing('i18n')
res = _generate_po_file(module.__file__, stdout_only=False)
self.assertEqual(res.returncode, 0)
self.assertEqual(res.stderr, '')
msgids = _extract_msgids(res.stdout)
snapshot_path = _get_snapshot_path(module.__name__)
snapshot = snapshot_path.read_text().splitlines()
self.assertListEqual(msgids, snapshot)
def update_translation_snapshots(module):
contents = _generate_po_file(module.__file__)
msgids = _extract_msgids(contents)
snapshot_path = _get_snapshot_path(module.__name__)
snapshot_path.write_text('\n'.join(msgids))