1 files changed, 130 insertions, 3 deletions

diff --git a/util/japanese.ts b/util/japanese.ts
index 2017280..d398b60 100644
--- a/util/japanese.ts
+++ b/util/japanese.ts
@@ -1,4 +1,5 @@
 import { UnicodeRange } from "./string.ts";
+import "./number.ts";
 
 declare global {
 	interface String {
@@ -57,6 +58,15 @@ declare global {
 		 * `strict` to true
 		 */
 		japaneseOnly(strict?: boolean): boolean
+
+		/** @summary convert any half-width katakana to full-width */
+		widenKatakana(): string;
+
+		/** @summary convert any full-width katakana to hiragana */
+		katakanaToHiragana(): string;
+
+		/** @summary convert any kana (full and half-width) to full-width hiragana */
+		normalizeKana(): string;
 	}
 }
 
@@ -85,7 +95,7 @@ function stringOnly(input: string, check: (key: string, val: number) => StringOn
 
 String.prototype.hiraganaOnly = function(strict = false) {
 	return stringOnly(this as string, (key, val) => {
-		if (key == UnicodeRange.JapaneseHiragana)
+		if (key == UnicodeRange.JapaneseFWHiragana)
 			return StringOnlyReturnValue.TallyAdd; // count hiragana characters
 		else if (!strict && key.startsWith("any-"))
 			return StringOnlyReturnValue.TallyIgnore; // allow any- (ascii whitespace and punctuation)
@@ -97,7 +107,7 @@ String.prototype.hiraganaOnly = function(strict = false) {
 
 String.prototype.katakanaOnly = function(strict = false) {
 	return stringOnly(this as string, (key, val) => {
-		if (key == UnicodeRange.JapaneseKatakana)
+		if ([UnicodeRange.JapaneseHWKatakana, UnicodeRange.JapaneseFWKatakana].includes(key as UnicodeRange))
 			return StringOnlyReturnValue.TallyAdd; // count katakana characters
 		else if (!strict && key.startsWith("any-"))
 			return StringOnlyReturnValue.TallyIgnore; // allow any- (ascii whitespace and punctuation)
@@ -121,7 +131,7 @@ String.prototype.kanjiOnly = function(strict = false) {
 
 String.prototype.kanaOnly = function(strict = false) {
 	return stringOnly(this as string, (key, val) => {
-		if (key == UnicodeRange.JapaneseHiragana || key == UnicodeRange.JapaneseKatakana)
+		if ([UnicodeRange.JapaneseHWKatakana, UnicodeRange.JapaneseFWKatakana, UnicodeRange.JapaneseFWHiragana].includes(key as UnicodeRange))
 			return StringOnlyReturnValue.TallyAdd; // count kana characters
 		else if (!strict && key.startsWith("any-"))
 			return StringOnlyReturnValue.TallyIgnore; // allow any- (ascii whitespace and punctuation)
@@ -143,3 +153,120 @@ String.prototype.japaneseOnly = function(strict = false) {
 	});
 }
 
+String.prototype.widenKatakana = function() {
+	const map: { [key: string]: string } = {
+		"ｧ": "ァ",
+		"ｱ": "ア",
+		"ｨ": "ィ",
+		"ｲ": "イ",
+		"ｩ": "ゥ",
+		"ｳ": "ウ",
+		"ｪ": "ェ",
+		"ｴ": "エ",
+		"ｫ": "ォ",
+		"ｵ": "オ",
+		"ｶﾞ": "ガ",
+		"ｶ": "カ",
+		"ｷﾞ": "ギ",
+		"ｷ": "キ",
+		"ｸﾞ": "グ",
+		"ｸ": "ク",
+		"ｹﾞ": "ゲ",
+		"ｹ": "ケ",
+		"ｺﾞ": "ゴ",
+		"ｺ": "コ",
+		"ｻﾞ": "ザ",
+		"ｻ": "サ",
+		"ｼﾞ": "ジ",
+		"ｼ": "シ",
+		"ｽﾞ": "ズ",
+		"ｽ": "ス",
+		"ｾﾞ": "ゼ",
+		"ｾ": "セ",
+		"ｿﾞ": "ゾ",
+		"ｿ": "ソ",
+		"ﾀﾞ": "ダ",
+		"ﾀ": "タ",
+		"ﾁﾞ": "ヂ",
+		"ﾁ": "チ",
+		"ﾂﾞ": "ヅ",
+		"ｯ": "ッ",
+		"ﾂ": "ツ",
+		"ﾃﾞ": "デ",
+		"ﾃ": "テ",
+		"ﾄﾞ": "ド",
+		"ﾄ": "ト",
+		"ﾅ": "ナ",
+		"ﾆ": "ニ",
+		"ﾇ": "ヌ",
+		"ﾈ": "ネ",
+		"ﾉ": "ノ",
+		"ﾊﾞ": "バ",
+		"ﾊﾟ": "パ",
+		"ﾊ": "ハ",
+		"ﾋﾞ": "ビ",
+		"ﾋﾟ": "ピ",
+		"ﾋ": "ヒ",
+		"ﾌﾞ": "ブ",
+		"ﾌﾟ": "プ",
+		"ﾌ": "フ",
+		"ﾍﾞ": "ベ",
+		"ﾍﾟ": "ペ",
+		"ﾍ": "ヘ",
+		"ﾎﾞ": "ボ",
+		"ﾎﾟ": "ポ",
+		"ﾎ": "ホ",
+		"ﾏ": "マ",
+		"ﾐ": "ミ",
+		"ﾑ": "ム",
+		"ﾒ": "メ",
+		"ﾓ": "モ",
+		"ｬ": "ャ",
+		"ﾔ": "ヤ",
+		"ｭ": "ュ",
+		"ﾕ": "ユ",
+		"ｮ": "ョ",
+		"ﾖ": "ヨ",
+		"ﾗ": "ラ",
+		"ﾘ": "リ",
+		"ﾙ": "ル",
+		"ﾚ": "レ",
+		"ﾛ": "ロ",
+		"ﾜ": "ワ",
+		"ｦ": "ヲ",
+		"ﾝ": "ン",
+		"ｳﾞ": "ヴ",
+		"ﾜﾞ": "ヷ",
+		"ｲﾞ": "イ゙",
+		"ｴﾞ": "エ゙",
+		"ｦﾞ": "ヺ",
+		"ｰ": "ー",
+	};
+
+	var out = "";
+	outer:
+	for (let i = 0; i < this.length; i++) {
+		for (var key in map) {
+			if (!this.substring(i).startsWith(key)) continue;
+			out += map[key];
+			i += key.length - 1;
+			continue outer;
+		}
+		
+		out += this[i];
+	}
+	return out;
+}
+
+String.prototype.katakanaToHiragana = function() {
+	return this.map(char => {
+		var code = char.codePointAt(0)!;
+		if (0x30a1 <= code && code <= 0x30f6) return (code + (0x3041 - 0x30a1)).toChar();
+		return char;
+	})
+}
+
+String.prototype.normalizeKana = function() {
+	return this.widenKatakana().katakanaToHiragana();
+}
+