片假名终结者

在网页中的日语外来语上方标注英文原词
当前为 2018-01-02 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name        Katakana Terminator
// @description Convert gairaigo (Japanese loan words) back to English
// @author      Arnie97
// @namespace   https://github.com/Arnie97
// @homepageURL https://github.com/Arnie97/katakana-terminator
// @grant       GM_xmlhttpRequest
// @version     2018.01.02
// @name:ja-JP  カタカナターミネータ
// @name:zh-CN  片假名终结者
// @description:zh-CN 在网页中的日语外来语上方标注英文原词
// ==/UserScript==

// define some shorthands
var _ = document;

// Forked from https://stackoverflow.com/a/4673436/5072722
function format(str) {
    var args = Array.prototype.slice.call(arguments, 1);
    return str.replace(/{(\d+)}/g, function(match, number) {
        return args[number] !== undefined? args[number]: match;
    });
}

// Inspired by http://www.the-art-of-web.com/javascript/search-highlight/
function scanTextNodes(node) {
    var excludeTags = /^(?:ruby|script|select|textarea)$/i;
    if (node === undefined || !node) {
        return scanTextNodes(_.body);
    } else if (excludeTags.test(node.nodeName)) {
        return;
    } else if (node.hasChildNodes()) {
        return [].forEach.call(node.childNodes, scanTextNodes);
    } else if (node.nodeType == 3) {
        while ((node = addRuby(node)));
    }
}

// Inspired by http://www.the-art-of-web.com/javascript/search-highlight/
function addRuby(node) {
    var katakana = /[\u30A1-\u30FA\u30FC-\u30FF]+/, match;
    if (!node.nodeValue || !(match = katakana.exec(node.nodeValue))) {
        return false;
    }
    var ruby = _.createElement('ruby');
    ruby.appendChild(_.createTextNode(match[0]));
    var rt = _.createElement('rt');
    queue[0].push(match[0]);
    queue[1].push(rt);
    ruby.appendChild(rt);

    var after = node.splitText(match.index);
    node.parentNode.insertBefore(ruby, after);
    after.nodeValue = after.nodeValue.substring(match[0].length);
    return after;
}

// Forked from https://stackoverflow.com/a/34209399
function buildURL(base, params) {
    var query = Object.keys(params).map(function(k) {
        var esc = encodeURIComponent;
        // Support arrays in parameters, just like Python Requests
        // {keyA: 1, keyB: [2, 3]} => '?keyA=1&keyB=2&keyB=3'
        if (params[k] instanceof Array) {
            return params[k].map(function(v) {
                return esc(k) + '=' + esc(v);
            }).join('&');
        }
        return esc(k) + '=' + esc(params[k]);
    }).join('&');
    return base + '?' + query;
}

function googleTranslate(src, dest, texts, nodes) {
    var full_text = texts.join('\n').trim();
    var api = 'https://translate.google.cn/translate_a/single';
    var params = {
        client: 't',
        sl: src,
        tl: dest,
        dt: ['rm', 't'],
        tk: googleToken(full_text),
        q: full_text
    };
    GM_xmlhttpRequest({
        method: "GET",
        url: buildURL(api, params),
        onload: function(dom) {
            var escaped_result = dom.responseText.replace("'", '\u2019');
            var translations = JSON.parse(escaped_result)[0];
            var romajis = translations.pop().pop().split(' ');
            for (var i = 0; i < nodes.length; i++) {
                var result = (
                    texts[i].length == 1?      // words or single katakanas?
                    romajis[i].toLowerCase():  // show the romaji
                    translations[i][0].trim()  // show the translation
                );
                nodes[i].appendChild(_.createTextNode(result));
            }
        }
    });
}

// Forked from https://github.com/cocoa520/Google_TK
function googleToken(r) {
    for(var a=406644,e=[],h=0,n=0;n<r.length;n++){var o=r.charCodeAt(n);128>o?e[h++]=o:(2048>o?e[h++]=o>>6|192:(55296==(64512&o)&&n+1<r.length&&56320==(64512&r.charCodeAt(n+1))?(o=65536+((1023&o)<<10)+(1023&r.charCodeAt(++n)),e[h++]=o>>18|240,e[h++]=o>>12&63|128):e[h++]=o>>12|224,e[h++]=o>>6&63|128),e[h++]=63&o|128)}function t(r,t){for(var a=0;a<t.length-2;a+=3){var e=(e=t.charAt(a+2))>="a"?e.charCodeAt(0)-87:Number(e),e="+"==t.charAt(a+1)?r>>>e:r<<e;r="+"==t.charAt(a)?r+e&4294967295:r^e}return r}for(r=a,h=0;h<e.length;h++)r+=e[h],r=t(r,"+-a^+6");return r=t(r,"+-3^+b+-f"),0>(r^=3293161072)&&(r=2147483648+(2147483647&r)),(r%=1e6).toString()+"."+(r^a)
}

// Split word list into chunks to limit the length of API requests
function chunkTranslate(start, end) {
    if (start == end) {
        return;
    }
    var texts = queue[0].slice(start, end);
    var nodes = queue[1].slice(start, end);
    return googleTranslate('ja', 'en', texts, nodes);
}

// Exception handling
function main(app_name) {
    try {
        scanTextNodes();
        var chunkSize = 200;
        for (var i = 0; i + chunkSize < queue[0].length; i += chunkSize) {
            chunkTranslate(i, i + chunkSize);
        }
        chunkTranslate(i, queue[0].length);
    } catch (e) {
        console.error(format('{0}: {1}', app_name, e));
    } finally {
        console.log(format('{0}: {1} items found', app_name, queue[0].length));
    }
}

var queue = [[], []];
main('Katakana Terminator');
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