kana-romaji
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A simple function to convert Hiragana and Katakana into Romaji representation.
937 lines (923 loc) • 38.6 kB
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<h1><a href="index.html">All files</a> kana-romaji.ts</h1>
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<span class="cline-any cline-neutral"> </span></td><td class="text"><pre class="prettyprint lang-js">const map = {
consonant: {
k: [..."かきくけこ"],
s: [..."さすせそ"],
sh: ["し",],
t: [..."たてと"],
ts: ["つ",],
ch: ["ち",],
n: [..."なにぬねのん"],
h: [..."はひへほ"],
m: [..."まみむめも"],
y: [..."やゆよ"],
ySupPre: [..."ゃゅょ"],
supPre: [..."ぁぃぅぇぉゎ"],
r: [..."らりるれろ"],
w: [..."わを",],
f: ["ふ"],
p: [..."ぱぴぷぺぽ"],
b: [..."ばびぶべぼ"],
j: [..."じぢ"],
z: [..."ざずぜぞ"],
d: [..."だでど"],
g: [..."がぎぐげご"],
repeatNextConsonant: ["っ"],
v: ["ゔ"],
},
vowel: {
a: [..."あかがさざただなはばぱまやらわぁゃゎ"],
i: [..."いきぎしじちぢにひびぴみりぃ"],
u: [..."うくぐすずつづぬふぶぷむゆるぅゅゔ"],
e: [..."えけげせぜてでねへべぺめれぇ"],
o: [..."おこごそぞとどのほぼぽもよろをょぉ"],
"-": ["ー"]
},
longVowel: {
a: 'ā',
i: 'ī',
u: 'ū',
e: 'ē',
o: 'ō',
} as { [key: string]: string }
};
declare interface tempObj {
consonant: string,
vowel?: string,
katakana: boolean,
through: boolean,
char: string,
}
const [lowerKatakana, upperKatakana] = [0x30A1, 0x30FB];
function isKatakana(ji: string, extended = false): boolean {
const code = ji.codePointAt(0);
return code! >= lowerKatakana && code! < (extended ? 0x30FF : upperKatakana);
}
function isHiragana(ji: string): boolean {
const code = ji.codePointAt(0);
return code! >= 0x3041 && code! <= 0x309F;
}
const noHiraganaCorrespondant = 'ヷヸヹヺ・ーヿ';
function convHiragana(ji: string): string {
if (isKatakana(ji) && !noHiraganaCorrespondant.includes(ji)) {
return String.fromCharCode(ji.codePointAt(0)! - 0x60);
}
return ji;
}
interface Strategy {
matches: (previous: tempObj, vowel: string) => boolean;
doWork: (previous: tempObj, curr: tempObj) => void;
}
interface GlobalStrategy {
matches: (prev: tempObj, curr: tempObj, next: tempObj) => boolean;
doWork: (prev: tempObj, curr: tempObj, next: tempObj) => void;
}
class SmallAiueoStrategies {
static strategies: Strategy[] = [
// JE, CHE, SHE
{
matches: (previous, vowel) => ['j', 'ch', 'sh'].includes(previous.consonant) && previous.vowel === 'i' && vowel === 'e',
doWork: (previous) => delete previous.vowel,
},
// DU, TU
{
matches: (previous, vowel) => [...'td'].includes(previous.consonant) && previous.vowel === 'o' && vowel === 'u',
doWork: (previous) => delete previous.vowel,
},
// DI, TI
{
matches: (previous, vowel) => [...'td'].includes(previous.consonant) && previous.vowel === 'e' && vowel === 'i',
doWork: (previous) => delete previous.vowel,
},
// SI
{
matches: (previous, vowel) => ['s', 'z'].includes(previous.consonant) && previous.vowel === 'u' && vowel === 'i',
doWork: (previous) => delete previous.vowel,
},
// Fa, Fi, Fu, Fe, Fo, Va, Vi, Vu, Ve, Vo
{
matches: (previous, vowel) => [..."fv"].includes(previous.consonant),
doWork: (previous) => delete previous.vowel,
},
// YE
{
matches: (previous, vowel) => previous.consonant === '' && previous.vowel === 'i' && vowel === 'e',
doWork: (previous) => previous.vowel = 'y',
},
// WO, WI, WE
{
matches: (previous, vowel) => previous.consonant === '' && previous.vowel === 'u' && [...'oei'].includes(vowel),
doWork: (previous) => previous.vowel = 'w',
},
// TWA
{
matches: (previous, vowel) => previous.consonant === 't' && previous.vowel === 'o' && vowel !== 'u',
doWork: (previous) => previous.vowel = 'w',
},
// GWA, KWA
{
matches: (previous, vowel) => ['k','g'].includes(previous.consonant) && previous.vowel === 'u' && vowel !== 'u',
doWork: (previous) => previous.vowel = 'w',
},
// HYE, BYE, PYE, KYE
{
matches: (previous, vowel) => [...'bhkp'].includes(previous.consonant) && previous.vowel === 'i' && vowel === 'e',
doWork: (previous) => previous.vowel = 'y',
},
// TSA, TSI, TSE, TSO
{
matches: (previous, vowel) => previous.consonant === 'ts' && previous.vowel === 'u',
doWork: (previous) => delete previous.vowel,
},
];
static doWork(previous: tempObj, curr: tempObj): void {
SmallAiueoStrategies.strategies
.filter(strategy => strategy.matches(previous, curr.vowel!))
.forEach(strategy => strategy.doWork(previous, curr));
}
}
class SmallYayuyoStrategies {
static strategies: Strategy[] = [
{
matches: (previous, vowel) => ["i", "e"].includes(previous.vowel!),
doWork: (previous) => delete previous.vowel,
},
{
matches: (previous, vowel) => [..."fv"].includes(previous.consonant) && previous.vowel === "u",
doWork: (previous) => delete previous.vowel,
},
{
matches: (previous, vowel) => ["sh", "ch", "j"].includes(previous.consonant),
doWork: (previous, curr) => curr.consonant = ""
},
];
static doWork(previous: tempObj, curr: tempObj): void {
curr.consonant = "y";
if (!previous) {
return;
}
SmallYayuyoStrategies.strategies
.filter(strategy => strategy.matches(previous, curr.vowel!))
.forEach(strategy => strategy.doWork(previous, curr));
}
}
class GlobalStrategies {
static strategies: GlobalStrategy[] = [
{
matches: (prev, curr, next) => (curr.vowel === '-' && prev && !!prev.vowel)
|| (curr.vowel === prev?.vowel && !curr.consonant && !(prev.consonant && next?.vowel === '-'))
|| (curr.vowel === 'u' && !curr.consonant && prev?.vowel === 'o'),
doWork: (prev, curr, next) => {
prev.vowel = map.longVowel[prev.vowel || ''];
curr.vowel = undefined;
}
},
{
matches: (prev, curr, next) => curr.consonant === "supPre",
doWork: (prev, curr, next) => {
SmallAiueoStrategies.doWork(prev, curr);
curr.consonant = "";
}
},
{
matches: (prev, curr, next) => curr.consonant === "ySupPre",
doWork: (prev, curr, next) => SmallYayuyoStrategies.doWork(prev, curr),
},
{
matches: (prev, curr, next) => curr.consonant === "repeatNextConsonant",
doWork: (prev, curr, next) => {
curr.consonant = next?.consonant.charAt(0) || "";
if (next?.consonant === "ch") {
curr.consonant = "t";
}
}
},
{
matches: (prev, curr, next) => curr.consonant === "n" && !curr.vowel,
doWork: (prev, curr, next) => {
if (next && (!next.consonant || next.consonant === 'y') && !next.through) {
curr.consonant = "n’";
}
}
}
];
static doWork = (prev: tempObj, curr: tempObj, next: tempObj): void =>
GlobalStrategies.strategies
.filter(strategy => strategy.matches(prev, curr, next))
.forEach(strategy => strategy.doWork(prev, curr, next))
}
/**
* Hiragana is transformed into lower case output.
* Katakana is transformed into UPPER case output.
* ```js
* toRomaji('ローマじ') // === 'RŌMAji';
* ```
* The sequences of same vowels and 'ou' output with prolonged vowel of the first.
* The sequence of 'ei' is not represented with long 'e'.
* ex)
* - 'ちちゅうかい', 'chichūkai'
* - 'ふりょう', 'furyō'
* - 'しょうがくせい', 'shōgakusei'
*
* Caveat: The rule to not consider as prolonged vowel sound
* when the consecutive vowels are from separate Kanjis is not respected.
*
* ex) 'きいはんとうのばあい'
* - OK: 'kiihantōnobaai'
* - Our _wrong_ output: 'kīhantōnobāi'
*
* 'おかあさん'
* - should be and is 'okāsan'
*
* 'とおり'
* - should be and is 'tōri'
* @param kana The input with Hiragana/Katakana
* @returns Romaji representation of the input
*/
export function toRomaji(kana: string): string {
return [...kana]
.map((ji) => ({
katakana: isKatakana(ji),
ji: convHiragana(ji),
char: ji,
through: !isKatakana(ji, true) && !isHiragana(ji)
}))
.map(({ ji, katakana, through, char }) =>
({
consonant: Object.entries(map.consonant)
.filter(([, v]) => v.includes(ji))
.map(([k,]) => k).join(),
vowel: Object.entries(map.vowel)
.filter(([, v]) => v.includes(ji))
.map(([k,]) => k).join(),
katakana,
through,
char,
} as tempObj))
.reduce((target, curr, i, arr) => {
const next = arr[i + 1];
const previous = target[i - 1];
GlobalStrategies.doWork(previous, curr, next);
target.push(curr);
return target;
}, [] as tempObj[])
.map(({ consonant, vowel, katakana, through, char }) => {
if (through) {
return char;
}
if (katakana) {
return (consonant + (vowel || "")).toUpperCase();
}
return consonant + (vowel || "");
})
.join("");
}</pre></td></tr></table></pre>
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