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Copy pathlanguage_tag.py
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35 lines (28 loc) · 1.11 KB
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import re
from functools import total_ordering
@total_ordering
class LanguageTag:
"""Language tag supported by LanguageTool."""
_LANGUAGE_RE = re.compile(r"^([a-z]{2,3})(?:[_-]([a-z]{2}))?$", re.I)
def __init__(self, tag, languages):
self.tag = tag
self.languages = languages
self.normalized_tag = self._normalize(tag)
def __eq__(self, other_tag):
return self.normalized_tag == self._normalize(other_tag)
def __lt__(self, other_tag):
return str(self) < self._normalize(other)
def __str__(self):
return self.normalized_tag
def _normalize(self, tag):
if not tag:
raise ValueError('empty language tag')
languages = {language.lower().replace('-', '_'): language
for language in self.languages}
try:
return languages[tag.lower().replace('-', '_')]
except KeyError:
try:
return languages[self._LANGUAGE_RE.match(tag).group(1).lower()]
except (KeyError, AttributeError):
raise ValueError('unsupported language: {!r}'.format(tag))