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93 lines (78 loc) · 2.97 KB
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"""LanguageTool language tag normalization module."""
import re
from typing import Iterable, Any
from functools import total_ordering
@total_ordering
class LanguageTag:
"""
A class to represent and normalize language tags.
:param tag: The language tag.
:type tag: str
:param languages: An iterable of supported language tags.
:type languages: Iterable[str]
Attributes:
tag (str): The language tag to be normalized.
languages (Iterable[str]): An iterable of supported language tags.
normalized_tag (str): The normalized language tag.
_LANGUAGE_RE (re.Pattern): A regular expression to match language tags.
"""
_LANGUAGE_RE = re.compile(r"^([a-z]{2,3})(?:[_-]([a-z]{2}))?$", re.I)
def __init__(self, tag: str, languages: Iterable[str]) -> None:
"""
Initialize a LanguageTag instance.
"""
self.tag = tag
self.languages = languages
self.normalized_tag = self._normalize(tag)
def __eq__(self, other: Any) -> bool:
"""
Compare this LanguageTag object with another for equality.
:param other: The other object to compare with.
:type other: Any
:return: True if the normalized tags are equal, False otherwise.
:rtype: bool
"""
return self.normalized_tag == self._normalize(other)
def __lt__(self, other: Any) -> bool:
"""
Compare this object with another for less-than ordering.
:param other: The object to compare with.
:type other: Any
:return: True if this object is less than the other, False otherwise.
:rtype: bool
"""
return str(self) < self._normalize(other)
def __str__(self) -> str:
"""
Returns the string representation of the object.
:return: The normalized tag as a string.
:rtype: str
"""
return self.normalized_tag
def __repr__(self) -> str:
"""
Return a string representation of the LanguageTag instance.
:return: A string in the format '<LanguageTag "language_tag_string">'
:rtype: str
"""
return f'<LanguageTag "{str(self)}">'
def _normalize(self, tag: str) -> str:
"""
Normalize a language tag to a standard format.
:param tag: The language tag to normalize.
:type tag: str
:raises ValueError: If the tag is empty or unsupported.
:return: The normalized language tag.
:rtype: str
"""
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(f'unsupported language: {tag!r}')