# -*- coding: utf-8 -*-
"""
Thai collation (sort according to Thai dictionary order)
Simple implementation using regular expressions
"""
import re
from typing import Iterable, List
_RE_TONE = re.compile(r"[็-์]")
_RE_LV_C = re.compile(r"([เ-ไ])([ก-ฮ])")
def _thkey(word: str) -> str:
cv = _RE_TONE.sub("", word) # remove tone
cv = _RE_LV_C.sub("\\2\\1", cv) # switch lead vowel
tone = _RE_TONE.sub(" ", word) # just tone
return cv + tone
[docs]def collate(data: Iterable, reverse: bool = False) -> List[str]:
"""
This function sorts a list of strings according to Thai alphabets.
:param list[str] data: a list of words to be sorted
:param bool reverse: If `reverse` is set to **True** the result will be
sorted in descending order. Otherwise, the result will
be sorted in ascending order.
By default, the parameter `reverse` is set to
**False**, sorting alphabettically in ascending order.
:return: a list of strings, sorted alphabetically, according to
Thai alphabets
:rtype: list[str]
:Example:
::
from pythainlp.util import collate
collate(['ไก่', 'เกิด', 'กาล', 'เป็ด', 'หมู', 'วัว', 'วันที่'])
# output: ['กาล', 'เกิด', 'ไก่', 'เป็ด', 'วันที่', 'วัว', 'หมู']
collate(['ไก่', 'เกิด', 'กาล', 'เป็ด', 'หมู', 'วัว', 'วันที่'], \\
reverse=True)
# output: ['หมู', 'วัว', 'วันที่', 'เป็ด', 'ไก่', 'เกิด', 'กาล']
"""
return sorted(data, key=_thkey, reverse=reverse)