/
kana.go
188 lines (165 loc) · 4.95 KB
/
kana.go
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package kana
import (
"regexp"
"strings"
"unicode"
"unicode/utf8"
)
var consonants []string = []string{"b", "d", "f", "g", "h", "j", "k", "l", "m", "p", "r", "s", "t", "w", "z"}
var hiragana_re = regexp.MustCompile(`ん([あいうえおなにぬねの])`)
var katakana_re = regexp.MustCompile(`ン([アイウエオナニヌネノ])`)
var kanaToRomajiTrie *Trie
var romajiToHiraganaTrie *Trie
var romajiToKatakanaTrie *Trie
func Initialize() {
/*
Build the Hiragana + Katakana trie.
Because there is no overlap between the hiragana and katakana sets,
they both use the same trie without conflict. Nice bonus!
*/
kanaToRomajiTrie = newTrie()
romajiToHiraganaTrie = newTrie()
romajiToKatakanaTrie = newTrie()
tables := []string{HiraganaTable, KatakanaTable}
for t, table := range tables {
rows := strings.Split(table, "\n")
colNames := strings.Split(string(rows[0]), "\t")[1:]
for _, row := range rows[1:] {
cols := strings.Split(string(row), "\t")
rowName := cols[0]
for i, kana := range cols[1:] {
value := rowName + colNames[i]
kanas := strings.Split(kana, "/")
for _, singleKana := range kanas {
if singleKana != "" {
// add to tries
kanaToRomajiTrie.insert(singleKana, value)
if t == 0 {
romajiToHiraganaTrie.insert(value, singleKana)
} else if t == 1 {
romajiToKatakanaTrie.insert(value, singleKana)
}
}
}
}
}
}
}
func KanaToRomaji(kana string) (romaji string) {
// unfortunate hack to deal with double n's
romaji = hiragana_re.ReplaceAllString(kana, "nn$1")
romaji = katakana_re.ReplaceAllString(romaji, "nn$1")
romaji = kanaToRomajiTrie.convert(romaji)
// do some post-processing for the tsu and stripe characters
// maybe a bit of a hacky solution - how can we improve?
// (they act more like punctuation)
tsus := []string{"っ", "ッ"}
for _, tsu := range tsus {
if strings.Index(romaji, tsu) > -1 {
for _, c := range romaji {
ch := string(c)
if ch == tsu {
i := strings.Index(romaji, ch)
runeSize := len(ch)
followingLetter, _ := utf8.DecodeRuneInString(romaji[i+runeSize:])
followingLetterStr := string(followingLetter)
if followingLetterStr != tsu {
romaji = strings.Replace(romaji, tsu, followingLetterStr, 1)
} else {
romaji = strings.Replace(romaji, tsu, "", 1)
}
}
}
}
}
line := "ー"
for i := strings.Index(romaji, line); i > -1; i = strings.Index(romaji, line) {
if i > 0 {
romaji = strings.Replace(romaji, line, "-", 1)
} else {
romaji = strings.Replace(romaji, line, "", 1)
}
}
return romaji
}
func replace_tsus(romaji string, tsu string) (result string) {
result = romaji
for _, consonant := range consonants {
result = strings.Replace(result, consonant+consonant, tsu+consonant, -1)
}
return result
}
func replace_ns(romaji string, n string) (result string) {
result = romaji
result = strings.Replace(result, "nn", n, -1)
return result
}
func RomajiToHiragana(romaji string) (hiragana string) {
romaji = strings.Replace(romaji, "-", "ー", -1)
romaji = replace_tsus(romaji, "っ")
romaji = replace_ns(romaji, "ん")
hiragana = romajiToHiraganaTrie.convert(romaji)
return hiragana
}
func RomajiToKatakana(romaji string) (katakana string) {
romaji = strings.Replace(romaji, "-", "ー", -1)
// convert double consonants to little tsus first
romaji = replace_tsus(romaji, "ッ")
romaji = replace_ns(romaji, "ン")
katakana = romajiToKatakanaTrie.convert(romaji)
return katakana
}
func IsLatin(s string) bool {
isLatin := true
runeForm := []rune(s)
for _, r := range runeForm {
isLatin = isLatin && unicode.IsOneOf([]*unicode.RangeTable{unicode.Latin, unicode.ASCII_Hex_Digit, unicode.White_Space, unicode.Hyphen}, r)
if !isLatin {
return isLatin
}
}
return isLatin
}
func IsKana(s string) bool {
isKana := true
runeForm := []rune(s)
for _, r := range runeForm {
isKana = isKana && unicode.IsOneOf([]*unicode.RangeTable{unicode.Hiragana, unicode.Katakana, unicode.Hyphen, unicode.Diacritic}, r)
if !isKana {
return isKana
}
}
return isKana
}
func IsKanji(s string) bool {
isKanji := true
runeForm := []rune(s)
for _, r := range runeForm {
isKanji = isKanji && unicode.IsOneOf([]*unicode.RangeTable{unicode.Ideographic}, r)
if !isKanji {
return isKanji
}
}
return isKanji
}
func replaceAll(haystack string, needles []string, replacements []string) (replaced string) {
replaced = haystack
for i := range needles {
replaced = strings.Replace(replaced, needles[i], replacements[i], -1)
}
return replaced
}
func NormalizeRomaji(s string) (romaji string) {
// transform romaji input to one specific standard form,
// which should be as close as possible to hiragana so that
// this library gives correct output when transforming to
// hiragana / katakana
romaji = s
romaji = strings.ToLower(romaji)
romaji = replaceAll(
romaji,
[]string{"ā", "ē", "ī", "ō", "ū", "ee", "uu"},
[]string{"a-", "ei", "ii", "oo", "u-", "ei", "u-"},
)
return romaji
}