# -*- coding: utf-8 -*-
"""
Thai soundex - LK82 system
Python implementation: Korakot Chaovavanich
https://gist.github.com/korakot/0b772e09340cac2f493868da035597e8
"""
import re
from pythainlp.util import remove_tonemark
_TRANS1 = str.maketrans(
"กขฃคฅฆงจฉชฌซศษสญยฎดฏตณนฐฑฒถทธบปผพภฝฟมรลฬฤฦวหฮอ",
"กกกกกกงจชชชซซซซยยดดตตนนททททททบปพพพฟฟมรรรรรวหหอ",
)
_TRANS2 = str.maketrans(
"กขฃคฅฆงจฉชซฌฎฏฐฑฒดตถทธศษสญณนรลฬฤฦบปพฟภผฝมำยวไใหฮาๅึืเแโุูอ",
"1111112333333333333333333444444445555555667777889AAABCDEEF",
)
# silenced
_RE_KARANT = re.compile(r"จน์|มณ์|ณฑ์|ทร์|ตร์|[ก-ฮ]์|[ก-ฮ][ะ-ู]์")
# signs, symbols, vowel that has no explicit sound
# Paiyannoi, Phinthu, Maiyamok, Maitaikhu, Nikhahit
_RE_SIGN = re.compile(r"[\u0e2f\u0e3a\u0e46\u0e47\u0e4d]")
[docs]def lk82(text: str) -> str:
"""
This function converts Thai text into phonetic code with the a
Thai soundex algorithm named **LK82** [#lk82]_.
:param str text: Thai word
:return: LK82 soundex of the given Thai word
:rtype: str
:Example:
::
from pythainlp.soundex import lk82
lk82("ลัก")
# output: 'ร1000'
lk82("รัก")
# output: 'ร1000'
lk82("รักษ์")
# output: 'ร1000'
lk82("บูรณการ")
# output: 'บE419'
lk82("ปัจจุบัน")
# output: 'ป3E54'
"""
if not text or not isinstance(text, str):
return ""
text = remove_tonemark(text) # 4. remove tone marks
text = _RE_KARANT.sub("", text) # 4. remove "karat" characters
text = _RE_SIGN.sub("", text) # 5. remove Mai tai khu,
if not text:
return ""
# 6. encode the first character
res = []
if "ก" <= text[0] <= "ฮ":
res.append(text[0].translate(_TRANS1))
text = text[1:]
else:
if len(text) > 1:
res.append(text[1].translate(_TRANS1))
res.append(text[0].translate(_TRANS2))
text = text[2:]
# encode the rest
i_v = None # ตำแหน่งตัวคั่นล่าสุด (สระ)
len_text = len(text)
for i, c in enumerate(text):
if (
c in "\u0e30\u0e31\u0e34\u0e35"
): # 7. ตัวคั่นเฉยๆ/ Sara A, Mai Han-Akat, Sara I, Sara II
i_v = i
res.append("")
elif (
c in "\u0e32\u0e36\u0e37\u0e39\u0e45"
): # 8. คั่นและใส่/ Sara Aa, Sara Ue, Sara Uee, Sara Uu, Lankkhangyao
i_v = i
res.append(c.translate(_TRANS2))
elif c == "\u0e38": # 9. สระอุ / Sara U
i_v = i
if i == 0 or (text[i - 1] not in "ตธ"):
res.append(c.translate(_TRANS2))
else:
res.append("")
elif c in "\u0e2b\u0e2d": # หอ
if i + 1 < len_text and (
text[i + 1] in "\u0e36\u0e37\u0e38\u0e39"
): # Sara Ue, Sara Uee, Sara U, Sara Uu
res.append(c.translate(_TRANS2))
elif c in "\u0e22\u0e23\u0e24\u0e26\u0e27":
if i_v == i - 1 or (
i + 1 < len_text
and (text[i + 1] in "\u0e36\u0e37\u0e38\u0e39")
): # Sara Ue, Sara Uee, Sara U, Sara Uu
res.append(c.translate(_TRANS2))
else:
res.append(c.translate(_TRANS2)) # 12.
# 13. remove repetitives
res2 = [res[0]]
for i in range(1, len(res)):
if res[i] != res[i - 1]:
res2.append(res[i])
# 14. fill zeros
return ("".join(res2) + "0000")[:5]