[keysnail]Japanese input plugin

japanese-input.ks.js

// Info

let PLUGIN_INFO =
<KeySnailPlugin>
    <name>Japanese Input</name>
    <description>Japanese Input on KeySnail</description>
    <author>958</author>
    <version>0.0.2</version>
    <updateURL>https://gist.github.com/958/994706/raw/japanese-input.ks.js</updateURL>
    <iconURL>https://sites.google.com/site/958site/Home/files/japanese-input.ks.png</iconURL>
    <license>MIT</license>
    <include>main</include>
    <detail lang="ja"><![CDATA[
=== 概要 ===
KeySnail が簡易的な日本語入力環境となります
もしもの時に役に立つかもしれません

=== 使い方 ===
>||
key.setEditKey('C-SPC', function (ev, arg) {
    ext.exec('japanese-input', arg, ev);
}, '日本語に変換');
||<
等として、テキストボックス上などで "katatumuri" と入力後 "C-SPC" を押してみてください

ただし KeySnail のプロンプト上では本エクステは使えません
]]></detail>
</KeySnailPlugin>;

// Main

plugins.ja_input = (function() {
    const roma2kana = {
        'a':'あ','i':'い','u':'う','e':'え','o':'お',
        'ka':'か','ki':'き','ku':'く','ke':'け','ko':'こ',
        'sa':'さ','si':'し','su':'す','se':'せ','so':'そ',
        'ta':'た','ti':'ち','tu':'つ','te':'て','to':'と',
        'na':'な','ni':'に','nu':'ぬ','ne':'ね','no':'の',
        'ha':'は','hi':'ひ','hu':'ふ','he':'へ','ho':'ほ',
        'ma':'ま','mi':'み','mu':'む','me':'め','mo':'も',
        'ya':'や','yu':'ゆ','yo':'よ',
        'ra':'ら','ri':'り','ru':'る','re':'れ','ro':'ろ',
        'wa':'わ','wi':'うぃ','wu':'う','we':'うぇ','wo':'を',
        'nn':'ん','n':'ん',

        'la':'ぁ','li':'ぃ','lu':'ぅ','le':'ぇ','lo':'ぉ',
        'xa':'ぁ','xi':'ぃ','xu':'ぅ','xe':'ぇ','xo':'ぉ',
        'ltu':'っ','ltsu':'っ',
        'xtu':'っ','xtsu':'っ',
        'lya':'ゃ','lyu':'ゅ','lyo':'ょ',
        'xya':'ゃ','xyu':'ゅ','xyo':'ょ',
        'lwa':'ゎ','xwa':'ゎ',

        'kya':'きゃ','kyi':'きぃ','kyu':'きゅ','kye':'きぇ','kyo':'きょ',
        'sya':'しゃ','syi':'しぃ','syu':'しゅ','sye':'しぇ','syo':'しょ',
        'sha':'しゃ','shi':'し','shu':'しゅ','she':'しぇ','sho':'しょ',
        'tya':'ちゃ','tyi':'ちぃ','tyu':'ちゅ','tye':'ちぇ','tyo':'ちょ',
        'cya':'ちゃ','cyi':'ちぃ','cyu':'ちゅ','cye':'ちぇ','cyo':'ちょ',
        'cha':'ちゃ','chi':'ち','chu':'ちゅ','che':'ちぇ','cho':'ちょ',
        'tsa':'つぁ','tsi':'つぃ','tsu':'つ','tse':'つぇ','tso':'つぉ',
        'tha':'てゃ','thi':'てぃ','thu':'てゅ','the':'てぇ','tho':'てょ',
        'nya':'にゃ','nyi':'にぃ','nyu':'にゅ','nye':'にぇ','nyo':'にょ',
        'hya':'ひゃ','hyi':'ひぃ','hyu':'ひゅ','hye':'ひぇ','hyo':'ひょ',
        'fa':'ふぁ','fi':'ふぃ','fu':'ふ','fe':'ふぇ','fo':'ふぉ',
        'fya':'ふゃ','fyi':'ふぃ','fyu':'ふゅ','fye':'ふぇ','fyo':'ふょ',
        'mya':'みゃ','myi':'みぃ','myu':'みゅ','mye':'みぇ','myo':'みょ',
        'rya':'りゃ','ryi':'りぃ','ryu':'りゅ','rye':'りぇ','ryo':'りょ',

        'ga':'が','gi':'ぎ','gu':'ぐ','ge':'げ','go':'ご',
        'za':'ざ','zi':'じ','zu':'ず','ze':'ぜ','zo':'ぞ',
        'da':'だ','di':'ぢ','du':'づ','de':'で','do':'ど',
        'ba':'ば','bi':'び','bu':'ぶ','be':'べ','bo':'ぼ',
        'va':'う゛ぁ','vi':'う゛ぃ','vu':'う゛','ve':'う゛ぇ','vo':'う゛ぉ',
        'vya':'う゛ゃ','vyi':'う゛ぃ','vyu':'う゛ゅ','vye':'う゛ぇ','vyo':'う゛ょ',
        'gya':'ぎゃ','gyi':'ぎぃ','gyu':'ぎゅ','gye':'ぎぇ','gyo':'ぎょ',
        'ja':'じゃ','ji':'じ','ju':'じゅ','je':'じぇ','jo':'じょ',
        'jya':'じゃ','jyi':'じ','jyu':'じゅ','jye':'じぇ','jyo':'じょ',
        'zya':'じゃ','zyi':'じぃ','zyu':'じゅ','zye':'じぇ','zyo':'じょ',
        'dya':'ぢゃ','dyi':'ぢぃ','dyu':'ぢゅ','dye':'ぢぇ','dyo':'ぢょ',
        'dha':'でゃ','dhi':'でぃ','dhu':'でゅ','dhe':'でぇ','dho':'でょ',
        'bya':'びゃ','byi':'びぃ','byu':'びゅ','bye':'びぇ','byo':'びょ',

        'pa':'ぱ','pi':'ぴ','pu':'ぷ','pe':'ぺ','po':'ぽ',
        'pya':'ぴゃ','pyi':'ぴぃ','pyu':'ぴゅ','pye':'ぴぇ','pyo':'ぴょ',

        '.':'。',',':'、',
        '-':'ー',
    };

    let self = {
        romaToHiragana: function (text) {
            text = text.toLowerCase();
            const reLTU = new RegExp(/^([bcdfghjklmpqrstvwxyz])\1+/);
            let kana = '';
            for (let i = 0; i < text.length; i++) {
                let hit = false;
                for (let len = (text.length - i > 3) ? text.length - 1 : 3; len > 0; len--) {
                    let roma = text.substr(i, len);
                    if (reLTU.test(roma)) {
                        kana += L('っ');
                        hit = true;
                        break;
                    } else if (roma in roma2kana) {
                        i += len - 1;
                        kana += L(roma2kana[roma]);
                        hit = true;
                        break;
                    }
                }
                if (!hit)
                    kana += text.substr(i, 1);
            }
            return kana;
        },

        translate: function(kana) {
            let xhr = util.httpGet('http://www.google.com/transliterate?langpair=ja-Hira|ja&text='+encodeURIComponent(kana));
            try {
                return JSON.parse(xhr.responseText);
            }catch(e){util.message(e)}
        }
    };
    return self;
})();

// Add ext

plugins.withProvides(function(provide) {
    function getTargetText(input) {
        const inputValue = input.value;
        const reRoma = new RegExp(/[a-z,./\\<>?_;:\]+*}@\[`{1-9!"#$%&'()-^=~|]/i);
        while (1) {
            let prevChar = inputValue.charAt(input.selectionStart - 1);
            if (reRoma.test(prevChar))
                goDoCommand('cmd_selectCharPrevious');
            else
                break;
        }
        return inputValue.slice(input.selectionStart, input.selectionEnd);
    }

    provide('japanese-input',
        function(ev, arg) {
            let text = getTargetText(ev.originalTarget);
            if (text.length == 0) return;

            let kana = plugins.ja_input.romaToHiragana(text);
            let results  = plugins.ja_input.translate(kana);
            if (!results) return;

            let selector = (function () {
                let jp = "";
                for (let i = 0; i < results.length; i++) {
                    let result = results[i];
                    prompt.selector({
                        collection: result[1],
                        actions: [[function(i) {
                            if (i >= 0) {
                                jp += result[1][i];
                                selector.next();
                            }
                        }, "select"]]
                    });
                    yield;
                }
                command.insertText(jp);
            })();
            selector.next();
        }, M({ja:'日本語に変換',en:'Janapese input'}));
}, PLUGIN_INFO);