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Add Czech romanization
This commit is contained in:
Petr Viktorin
parent
3475c86d2e
commit
c25db1d2cf
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@ -1,7 +1,140 @@
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# encoding: utf8
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"""Provides `romanize()` for romanizing simple Japanese text."""
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"""Provides `romanize()` for romanizing simple Japanese text.
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_roomaji_kana = {
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Also provides available romanizers in a dictionary keyed by language identifier.
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"""
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class Romanizer(object):
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def __init__(self, parent=None, **tables):
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"""Create a Romanizer
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parent: A LookupTables to base this one on
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tables: Dicts that become the object's attributes. If a parent is given,
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its tables are used, and updated with the given ones
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"""
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self.parent = parent
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if parent:
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self.tables = parent.tables
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for name, table in tables.items():
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# Take a copy -- don't want to clobber the parent's tables
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self.tables[name] = dict(self.tables[name])
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self.tables[name].update(table)
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else:
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self.tables = tables
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for name, table in self.tables.items():
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setattr(self, name, table)
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def romanize(self, string):
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"""Convert a string of kana to roomaji."""
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vowels = ['a', 'e', 'i', 'o', 'u', 'y']
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characters = []
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last_kana = None # Used for ー; っ or ッ; ん or ン
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last_char = None # Used for small kana combos
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for char in string:
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# Full-width Latin
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if 0xff01 <= ord(char) <= 0xff5e:
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if last_kana == 'sokuon':
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raise ValueError("Sokuon cannot precede Latin characters.")
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# XXX Real Unicode decomposition would be nicer
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char = chr(ord(char) - 0xff01 + 0x21)
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characters.append(char)
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last_kana = None
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# Small vowel kana
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elif char in self.roomaji_small_kana:
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combo = last_char + char
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if combo in self.roomaji_small_kana_combos:
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characters[-1] = self.roomaji_small_kana_combos[combo]
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else:
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# If we don't know what it is... act dumb and treat it as a
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# full-size vowel. Better than bailing, and seems to occur a
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# lot, e.g. ピィ is "pii"
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characters.append(self.roomaji_small_kana[char])
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last_kana = self.roomaji_small_kana[char]
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# Youon
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elif char in self.roomaji_youon:
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if not last_kana or last_kana[-1] != 'i' or last_kana == 'i':
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raise ValueError("Youon must follow an -i sound.")
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# Drop the -i and append the ya/yu/yo sound
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new_sound = self.roomaji_youon[char]
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if last_kana in self.y_drop:
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# Strip the y-
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new_char = self.y_drop[last_kana] + new_sound[1:]
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else:
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new_char = last_kana[:-1] + new_sound
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characters[-1] = new_char
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last_kana = new_char
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# Sokuon
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elif char in (u'っ', u'ッ'):
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# Remember it and double the consonant next time around
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last_kana = 'sokuon'
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# Extended vowel or n
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elif char == u'ー':
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if last_kana[-1] not in vowels:
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raise ValueError(u"'ー' must follow by a vowel.")
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if last_kana[-1] in self.lengthened_vowels:
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characters[-1] = characters[-1][:-1]
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characters.append(self.lengthened_vowels[last_kana[-1]])
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else:
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characters.append(last_kana[-1])
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last_kana = None
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# Regular ol' kana
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elif char in self.roomaji_kana:
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kana = self.roomaji_kana[char]
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if last_kana == 'sokuon':
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if kana[0] in vowels:
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raise ValueError("Sokuon cannot precede a vowel.")
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characters.append(kana[0])
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elif last_kana == 'n' and kana[0] in vowels:
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characters.append("'")
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# Special characters fo doubled kana
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if kana[0] in self.lengthened_vowels and characters and kana == characters[-1][-1]:
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kana = self.lengthened_vowels[kana[0]]
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characters[-1] = characters[-1][:-1]
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characters.append(kana)
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last_kana = kana
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# Not Japanese?
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else:
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if last_kana == 'sokuon':
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raise ValueError("Sokuon must be followed by another kana.")
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characters.append(char)
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last_kana = None
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last_char = char
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if last_kana == 'sokuon':
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raise ValueError("Sokuon cannot be the last character.")
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return unicode(''.join(characters))
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romanizers = dict()
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romanizers['en'] = Romanizer(
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roomaji_kana={
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# Hiragana
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u'あ': 'a', u'い': 'i', u'う': 'u', u'え': 'e', u'お': 'o',
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u'か': 'ka', u'き': 'ki', u'く': 'ku', u'け': 'ke', u'こ': 'ko',
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@ -38,24 +171,24 @@ _roomaji_kana = {
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u'バ': 'ba', u'ビ': 'bi', u'ブ': 'bu', u'ベ': 'be', u'ボ': 'bo',
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u'パ': 'pa', u'ピ': 'pi', u'プ': 'pu', u'ペ': 'pe', u'ポ': 'po',
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u'ヴ': 'vu',
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}
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},
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_roomaji_youon = {
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roomaji_youon={
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# Hiragana
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u'ゃ': 'ya', u'ゅ': 'yu', u'ょ': 'yo',
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# Katakana
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u'ャ': 'ya', u'ュ': 'yu', u'ョ': 'yo',
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}
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},
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# XXX If romanize() ever handles hiragana, it will need to make sure that the
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# preceding character was a katakana
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# This does not include every small kana combination, but should include every
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# one used in a Pokémon name. An exhaustive list would be.. very long
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_roomaji_small_kana = {
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# XXX If romanize() ever handles hiragana, it will need to make sure that the
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# preceding character was a katakana
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# This does not include every small kana combination, but should include every
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# one used in a Pokémon name. An exhaustive list would be.. very long
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roomaji_small_kana={
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u'ァ': 'a', u'ィ': 'i', u'ゥ': 'u', u'ェ': 'e', u'ォ': 'o',
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}
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_roomaji_small_kana_combos = {
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},
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roomaji_small_kana_combos={
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# These are, by the way, fairly arbitrary. "shi xi" to mean "sy" is
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# particularly weird, but it seems to be what GF intends
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@ -74,100 +207,38 @@ _roomaji_small_kana_combos = {
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u'ミィ': 'my',
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u'ビィ': 'by',
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u'ピィ': 'py',
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}
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},
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lengthened_vowels={},
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y_drop={'chi': 'ch', 'shi': 'sh', 'ji': 'j'},
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)
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def romanize(string):
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"""Converts a string of kana to roomaji."""
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romanizers['cs'] = Romanizer(parent=romanizers['en'],
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roomaji_kana={
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u'し': u'ši', u'ち': u'či', u'つ': u'cu',
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u'や': u'ja', u'ゆ': u'ju', u'よ': u'jo',
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u'じ': u'dži', u'ぢ': u'dži',
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u'シ': u'ši', u'チ': u'či', u'ツ': u'cu',
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u'ヤ': u'ja', u'ユ': u'ju', u'ヨ': 'jo',
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u'ジ': u'dži', u'ヂ': u'dži',
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},
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roomaji_youon={
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u'ゃ': 'ja', u'ゅ': 'ju', u'ょ': 'jo',
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u'ャ': 'ja', u'ュ': 'ju', u'ョ': 'jo',
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},
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roomaji_small_kana_combos={
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u'チェ': u'če', u'シェ': u'še', u'ジェ': u'dže',
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u'テェ': u'tje', u'デェ': u'dje',
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u'シィ': u'sí', u'ミィ': u'mí', u'ビィ': u'bí', u'ピィ': u'pí',
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},
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lengthened_vowels={'a': u'á', 'e': u'é', 'i': u'í', 'o': u'ó', 'u': u'ú'},
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y_drop={u'či': u'č', u'ši': u'š', u'dži': u'dž', u'ni': u'ňj'},
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)
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vowels = ['a', 'e', 'i', 'o', 'u', 'y']
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def romanize(string, lang='en'):
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"""Convert a string of kana to roomaji."""
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characters = []
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last_kana = None # Used for ー; っ or ッ; ん or ン
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last_char = None # Used for small kana combos
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for char in string:
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# Full-width Latin
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if 0xff01 <= ord(char) <= 0xff5e:
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if last_kana == 'sokuon':
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raise ValueError("Sokuon cannot precede Latin characters.")
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# Get the correct romanizer; fall back to English
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romanizer = romanizers.get(lang, 'en')
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# XXX Real Unicode decomposition would be nicer
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char = chr(ord(char) - 0xff01 + 0x21)
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characters.append(char)
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last_kana = None
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# Small vowel kana
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elif char in _roomaji_small_kana:
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combo = last_char + char
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if combo in _roomaji_small_kana_combos:
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characters[-1] = _roomaji_small_kana_combos[combo]
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else:
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# If we don't know what it is... act dumb and treat it as a
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# full-size vowel. Better than bailing, and seems to occur a
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# lot, e.g. ピィ is "pii"
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characters.append(_roomaji_small_kana[char])
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last_kana = _roomaji_small_kana[char]
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# Youon
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elif char in _roomaji_youon:
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if not last_kana or last_kana[-1] != 'i' or last_kana == 'i':
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raise ValueError("Youon must follow an -i sound.")
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# Drop the -i and append the ya/yu/yo sound
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new_sound = _roomaji_youon[char]
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if last_kana in ['chi', 'shi', 'ji']:
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# Strip the y-
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new_char = last_kana[:-1] + new_sound[1:]
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else:
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new_char = last_kana[:-1] + new_sound
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characters[-1] = new_char
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last_kana = new_char
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# Sokuon
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elif char in (u'っ', u'ッ'):
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# Remember it and double the consonant next time around
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last_kana = 'sokuon'
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# Extended vowel or n
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elif char == u'ー':
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if last_kana[-1] not in vowels:
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raise ValueError(u"'ー' must follow by a vowel.")
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characters.append(last_kana[-1])
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last_kana = None
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# Regular ol' kana
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elif char in _roomaji_kana:
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kana = _roomaji_kana[char]
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if last_kana == 'sokuon':
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if kana[0] in vowels:
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raise ValueError("Sokuon cannot precede a vowel.")
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characters.append(kana[0])
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elif last_kana == 'n' and kana[0] in vowels:
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characters.append("'")
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characters.append(kana)
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last_kana = kana
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# Not Japanese?
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else:
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if last_kana == 'sokuon':
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raise ValueError("Sokuon must be followed by another kana.")
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characters.append(char)
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last_kana = None
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last_char = char
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if last_kana == 'sokuon':
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raise ValueError("Sokuon cannot be the last character.")
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return unicode(''.join(characters))
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# Romanize away!
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return romanizer.romanize(string)
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@ -12,6 +12,7 @@ def test_roomaji():
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# Elongated vowel
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(u'イーブイ', 'iibui'),
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(u'ホーホー', 'hoohoo'),
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(u'ピカチュウ', u'pikachuu'),
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# Combined characters
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(u'ニャース', 'nyaasu'),
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@ -28,3 +29,28 @@ def test_roomaji():
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for kana, roomaji in tests:
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result = pokedex.roomaji.romanize(kana)
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assert_equal(result, roomaji, u"'%s' romanizes correctly" % roomaji)
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def test_roomaji_cs():
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tests = [
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(u'ヤミカラス', u'jamikarasu'),
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# Elongated vowel
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(u'イーブイ', u'íbui'),
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(u'ホーホー', u'hóhó'),
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(u'ピカチュウ', u'pikačú'),
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# Combined characters
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(u'ニャース', u'ňjásu'),
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(u'ジャ', u'dža'),
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(u'ぎゃくてん', u'gjakuten'),
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(u'ウェザーボール', u'wezábóru'),
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# Special katakana combinations
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(u'ラティアス', u'ratiasu'),
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(u'ウィー', u'wí'),
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(u'セレビィ', u'serebí'),
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]
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for kana, roomaji in tests:
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result = pokedex.roomaji.romanize(kana, 'cs')
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assert_equal(result, roomaji, u"'%s' romanizes correctly for Czech" % roomaji)
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