Implemented romaji to kana conversion

EClaesson · Sep 20, 2020 · f394a9b · f394a9b
1 parent 6362fac
commit f394a9b
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Showing 4 changed files with 63 additions and 4 deletions.
diff --git a/README.md b/README.md
@@ -55,6 +55,14 @@ Return a string based on _str_ where all katakana characters are replaced with h
 
 Returns a string based on _str_ where all hiragana and katakana are replaced with romaji.
 
+``` romajiToHiragana(str) ```
+
+Returns a string based on _str_ with all romaji replaced with hiragana.
+
+``` romajiToKatakana(str) ```
+
+Returns a string based on _str_ with all romaji replaced with katakana.
+
 ## Examples
 
 ```javascript
@@ -80,4 +88,7 @@ jskana.hiraganaToKatakana('「うまい もも こっちゃ こい。 にがい
 
 jskana.kanaToRomaji('こちゃに れもんを いれます。')
 > 'kochani remonwo iremasu。'
+
+jskana.romajiToHiragana('kochani remonwo iremasu')
+> 'こちゃに れもんを いれます'
 ```
diff --git a/jskana.js b/jskana.js
@@ -55,7 +55,7 @@ const HIRAGANA_ROMAJI_MAPPING = [
     ['りゅ', 'ryu'],	['りょ', 'ryo'],	['ぎゃ', 'gya'],	['ぎゅ', 'gyu'],	['ぎょ', 'gyo'],
     ['じゃ', 'ja'],	['じゅ', 'ju'],	['じょ', 'jo'],	['びゃ', 'bya'],	['びゅ', 'byu'],
     ['びょ', 'byo'],	['ぴゃ', 'pya'],	['ぴゅ', 'pyu'],	['ぴょ', 'pyo'],
-];
+].sort((a, b) => { return a[1].length < b[1].length ? -1 : 1; });
 
 const HIRAGANA = 0;
 const KATAKANA = 1;
@@ -131,6 +131,14 @@ function _systemConvertChar(char, from_system, to_system) {
 function _systemConvertString(str, from_system, to_system) {
     let converted = '';
 
+    if(from_system === ROMAJI) {
+        if(to_system === HIRAGANA) {
+            return _romajiToHiragana(str);
+        } else {
+            return _systemConvertString(_romajiToHiragana(str), HIRAGANA, KATAKANA);
+        }
+    }
+
     [...str].forEach((char) => {
         if(_isCharWhitespace(char) || !isStringOfSystem(char, from_system)) {
             converted += char;
@@ -152,6 +160,32 @@ function _hiraganaCharToRomaji(char) {
     return '';
 }
 
+function _romajiToHiragana(str) {
+    let remaining = str.slice();
+    let hiragana = '';
+
+    while(remaining.length > 0) {
+        let found = false;
+
+        for(let i = HIRAGANA_ROMAJI_MAPPING.length - 1; i >= 0; i--) {
+            let mapping = HIRAGANA_ROMAJI_MAPPING[i];
+
+            if(remaining.startsWith(mapping[1])) {
+                hiragana += mapping[0];
+                remaining = remaining.substring(mapping[1].length);
+                found = true;
+            }
+        }
+
+        if(!found) {
+            hiragana += remaining[0];
+            remaining = remaining.substring(1);
+        }
+    }
+
+    return hiragana;
+}
+
 function isStringOfSystem(str, system, include_punctuation) {
     if(system === ROMAJI) {
         return isRomaji(str, include_punctuation);
@@ -216,6 +250,9 @@ function isRomaji(str, include_punctuation=true) { return [...str].every((char)
 function hiraganaToKatakana(str) { return _systemConvertString(str, HIRAGANA, KATAKANA); }
 function katakanaToHiragana(str) { return _systemConvertString(str, KATAKANA, HIRAGANA); }
 
+function romajiToHiragana(str) { return _systemConvertString(str, ROMAJI, HIRAGANA); }
+function romajiToKatakana(str) { return _systemConvertString(str, ROMAJI, KATAKANA); }
+
 exports.splitKanaString = splitKanaString;
 exports.isHiragana = isHiragana;
 exports.isKatakana = isKatakana;
@@ -224,4 +261,6 @@ exports.isPunctuation = isPunctuation;
 exports.isRomaji = isRomaji;
 exports.hiraganaToKatakana = hiraganaToKatakana;
 exports.katakanaToHiragana = katakanaToHiragana;
-exports.kanaToRomaji = kanaToRomaji;
+exports.kanaToRomaji = kanaToRomaji;
+exports.romajiToHiragana = romajiToHiragana;
+exports.romajiToKatakana = romajiToKatakana;
diff --git a/package.json b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "jskana",
-  "version": "0.0.2",
+  "version": "0.0.3",
   "description": "Japanese kana and romaji conversion.",
   "main": "jskana.js",
   "scripts": {

diff --git a/test.js b/test.js
@@ -58,4 +58,13 @@ test('katakanaToHiragana', () => {
 test('kanaToRomaji', () => {
     expect(jskana.kanaToRomaji('こちゃに れもんを いれます。')).toBe('kochani remonwo iremasu。');
     expect(jskana.kanaToRomaji('ネクライトーキー')).toBe('nekuraitoki');
-});
+});
+
+test('romajiToHiragana', () => {
+    expect(jskana.romajiToHiragana('kochani remonwo iremasu。')).toBe('こちゃに れもんを いれます。');
+})
+
+test('romajiToKatakana', () => {
+    expect(jskana.romajiToKatakana('kurakushon')).toBe('クラクション');
+})
+