--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/katakana.py Tue Jul 28 21:51:54 2020 +0300
@@ -0,0 +1,208 @@
+#!/usr/bin/env python3
+
+# why isn't this in functools...
+# https://www.geeksforgeeks.org/function-composition-in-python/
+def compose(*func):
+ import functools
+ return functools.reduce(lambda f, g: lambda x: f(g(x)), func, lambda x: x)
+
+# mapping of romaji to katakana
+RAW_KATAKANA_TABLE = {
+ 'a': 'ア',
+ 'ba': 'バ',
+ 'be': 'ベ',
+ 'bi': 'ビ',
+ 'bo': 'ボ',
+ 'bu': 'ブ',
+ 'bya': 'ビャ',
+ 'byo': 'ビョ',
+ 'byu': 'ビュ',
+ 'cha': 'チャ',
+ 'che': 'チェ',
+ 'chi': 'チ',
+ 'cho': 'チョ',
+ 'chu': 'チュ',
+ 'da': 'ダ',
+ 'de': 'デ',
+ 'di': 'ディ',
+ 'do': 'ド',
+ 'du': 'ドゥ',
+ 'dyu': 'デュ',
+ 'e': 'エ',
+ 'fa': 'ファ',
+ 'fe': 'フェ',
+ 'fi': 'フィ',
+ 'fo': 'フォ',
+ 'fu': 'フ',
+ 'fyu': 'フュ',
+ 'ga': 'ガ',
+ 'ge': 'ゲ',
+ 'gi': 'ギ',
+ 'go': 'ゴ',
+ 'gu': 'グ',
+ 'gya': 'ギャ',
+ 'gyo': 'ギョ',
+ 'gyu': 'ギュ',
+ 'ha': 'ハ',
+ 'he': 'ヘ',
+ 'hi': 'ヒ',
+ 'ho': 'ホ',
+ 'hya': 'ヒャ',
+ 'hyo': 'ヒョ',
+ 'hyu': 'ヒュ',
+ 'i': 'イ',
+ 'ja': 'ジャ',
+ 'je': 'ジェ',
+ 'ji': 'ジ',
+ 'jo': 'ジョ',
+ 'ju': 'ジュ',
+ 'ka': 'カ',
+ 'ke': 'ケ',
+ 'ki': 'キ',
+ 'ko': 'コ',
+ 'ku': 'ク',
+ 'kya': 'キャ',
+ 'kyo': 'キョ',
+ 'kyu': 'キュ',
+ 'ma': 'マ',
+ 'me': 'メ',
+ 'mi': 'ミ',
+ 'mo': 'モ',
+ 'mu': 'ム',
+ 'mya': 'ミャ',
+ 'myo': 'ミョ',
+ 'myu': 'ミュ',
+ 'na': 'ナ',
+ 'ne': 'ネ',
+ 'ni': 'ニ',
+ 'no': 'ノ',
+ 'nu': 'ヌ',
+ 'nya': 'ニャ',
+ 'nyo': 'ニョ',
+ 'nyu': 'ニュ',
+ 'n': 'ン',
+ 'o': 'オ',
+ 'pa': 'パ',
+ 'pe': 'ペ',
+ 'pi': 'ピ',
+ 'po': 'ポ',
+ 'pu': 'プ',
+ 'pya': 'ピャ',
+ 'pyo': 'ピョ',
+ 'pyu': 'ピュ',
+ 'ra': 'ラ',
+ 're': 'レ',
+ 'ri': 'リ',
+ 'ro': 'ロ',
+ 'ru': 'ル',
+ 'rya': 'リャ',
+ 'ryo': 'リョ',
+ 'ryu': 'リュ',
+ 'sa': 'サ',
+ 'se': 'セ',
+ 'so': 'ソ',
+ 'su': 'ス',
+ 'sha': 'シャ',
+ 'she': 'シェ',
+ 'shi': 'シ',
+ 'sho': 'ショ',
+ 'shu': 'シュ',
+ 'ta': 'タ',
+ 'te': 'テ',
+ 'ti': 'ティ',
+ 'to': 'ト',
+ 'tu': 'トゥ',
+ 'tsa': 'ツァ',
+ 'tse': 'ツェ',
+ 'tso': 'ツォ',
+ 'tsu': 'ツ',
+ 'tyu': 'テュ',
+ 'u': 'ウ',
+ 'va': 'ヴァ',
+ 've': 'ヴェ',
+ 'vi': 'ヴィ',
+ 'vo': 'ヴォ',
+ 'vu': 'ヴ',
+ 'wa': 'ワ',
+ 'we': 'ウェ',
+ 'wi': 'ウィ',
+ 'wo': 'ウォ',
+ 'ya': 'ヤ',
+ 'ye': 'イェ',
+ 'yi': 'ヤィ',
+ 'yo': 'ヨ',
+ 'yu': 'ユ',
+ 'za': 'ザ',
+ 'ze': 'ゼ',
+ 'zo': 'ゾ',
+ 'zu': 'ズ',
+}
+
+def full_katakana_table(raw_table):
+ '''
+ adds small tsu and long vowel variants to the katakana table
+ '''
+ from copy import copy
+ katakana = copy(raw_table)
+ katakana['hu'] = katakana['fu']
+ katakana['si'] = katakana['shi']
+ # add small tsu versions
+ for latin in copy(list(katakana.keys())):
+ if len(latin) > 1 and latin[0] != 'n':
+ # we do not need a small tsu version for n because n is its own kana
+ katakana[latin[0] + latin] = 'ッ' + katakana[latin]
+ # add long vowel versions
+ for latin in copy(list(katakana.keys())):
+ katakana[latin + latin[-1]] = katakana[latin] + 'ー'
+ return katakana
+
+def katakana_keys(kana_table):
+ return sorted(kana_table.keys(), key = len)[::-1]
+
+katakana_table = full_katakana_table(RAW_KATAKANA_TABLE)
+
+def finnish_to_romaji(finnish):
+ # translates finnish text to Japanese romaji
+ # does not, however, fill in 'u' vowels to consonants, that is done
+ # by the splice_romaji function
+ from re import sub
+ cleanup = lambda str: sub(r'[^a-zåäö]', '', str)
+ return cleanup(finnish
+ .lower()
+ .replace('y', 'u')
+ .replace('w', 'v')
+ .replace('j', 'y')
+ .replace('l', 'r')
+ .replace('ä', 'a')
+ .replace('ö', 'o')
+ .replace('å', 'oo'))
+
+def splice_romaji(romaji, keys):
+ while len(romaji) > 0:
+ for key in keys:
+ if romaji.startswith(key):
+ yield key
+ romaji = romaji[len(key):]
+ break
+ else:
+ yield romaji[0] + 'u'
+ romaji = romaji[1:]
+
+def splices_to_katakana(splices, katakana_table):
+ to_katakana = lambda romaji: katakana_table[romaji]
+ return ''.join(map(to_katakana, splices))
+
+class Transliterator:
+ def __init__(self):
+ self.cached_katakana_table = full_katakana_table(RAW_KATAKANA_TABLE)
+ self.cached_katakana_keys = katakana_keys(self.cached_katakana_table)
+ def __call__(self, finnish):
+ return compose(
+ lambda k: splices_to_katakana(k, katakana_table = self.cached_katakana_table),
+ lambda k: splice_romaji(k, keys = self.cached_katakana_keys),
+ finnish_to_romaji,
+ )(finnish)
+ def __repr__(self):
+ return 'Transliterator()'
+
+transliterate = Transliterator()