英文前部加粗

网页英文前部加粗脚本
当前为 2022-05-20 提交的版本，查看最新版本。
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// ==UserScript==
// @name         英文前部加粗
// @namespace    https://github.com/itorr/bionic-reading.user.js
// @version      0.8
// @description  网页英文前部加粗脚本
// @author       itorr
// @match        *://*/*
// @grant        none
// @license      MIT
// @run-at       document-idle
// @supportURL   https://github.com/itorr/bionic-reading.user.js/issues
// ==/UserScript==

const enCodeHTML = s=> s.replace(/[\u00A0-\u9999<>\&]/g,w=>'&#'+w.charCodeAt(0)+';');

let body = document.body;

if(/weibo/.test(location.hostname)){
    const wbMainEl = document.querySelector('.WB_main');
    if(wbMainEl) body = wbMainEl;

    // 修复旧版微博自定义样式失效 bug
    const customStyleEl = document.querySelector('#custom_style');
    if(customStyleEl)customStyleEl.removeAttribute('id');
}

const styleEl = document.createElement('style');
styleEl.innerHTML = 'bbb{font-weight:bold;}';

const excludeTagNames = [
    'script','style','xmp',
    'input','textarea',
    'pre','code',
    'h1','h2','h3','h4',
    'b','strong'
].map(a=>a.toUpperCase());

const gather = el=>{
    let textEls = [];
    el.childNodes.forEach(el=>{
        if(el.isEnB) return;

        if(el.nodeType === 3){
            textEls.push(el);
        }else if(el.childNodes){
            if(excludeTagNames.includes(el.tagName)) return;
            textEls = textEls.concat(gather(el))
        }
    })
    return textEls;
};

const engRegexi  = /[a-z][a-z0-9]+/i;
const engRegexig = /[a-z][a-z0-9]+/ig;
let replaceTextByEl = el=>{
    const text = el.data;
    if(!engRegexi.test(text))return;

    const spanEl = document.createElement('spann');
    spanEl.isEnB = true;
    spanEl.innerHTML = enCodeHTML(text).replace(engRegexig,word=>{
        let halfLength;
        if(/ing$/.test(word)){
            halfLength = word.length - 3;
        }else if(word.length<5){
            halfLength = Math.floor(word.length/2);
        }else{
            halfLength = Math.ceil(word.length/2);
        }

        return '<bbb>'+word.substr(0,halfLength)+'</bbb>'+word.substr(halfLength)
    })
    el.after(spanEl);
    el.remove();
};

if(/reddit/.test(location.hostname)){
    replaceTextByEl = el=>{
        el.data = el.data.replace(engRegexig,word=>{
            let halfLength;
            if(/ing$/.test(word)){
                halfLength = word.length - 3;
            }else if(word.length<5){
                halfLength = Math.floor(word.length/2);
            }else{
                halfLength = Math.ceil(word.length/2);
            }
            const a = word.substr(0,halfLength).
                replace(/[a-z]/g,w=>'\uD835' + String.fromCharCode(w.charCodeAt(0)+56717)).
                replace(/[A-Z]/g,w=>'\uD835' + String.fromCharCode(w.charCodeAt(0)+56723));
            const b = word.substr(halfLength).
                replace(/[a-z]/g,w=> String.fromCharCode(55349,w.charCodeAt(0)+56665)).
                replace(/[A-Z]/g,w=> String.fromCharCode(55349,w.charCodeAt(0)+56671));
            return a + b;
        })
    }
}

const bionic = _=>{
    const textEls = gather(body);

    textEls.forEach(replaceTextByEl);
    document.head.appendChild(styleEl);
}

const lazy = (func,ms = 0)=> {
    return _=>{
        clearTimeout(func.T)
        func.T = setTimeout(func,ms)
    }
};
lazy(bionic)();

if(window.ResizeObserver){
    (new ResizeObserver(lazy(bionic,100))).observe(body);
}else{
    const {open,send} = XMLHttpRequest.prototype;
    XMLHttpRequest.prototype.open = function(){
        this.addEventListener('load',lazy(bionic));
        return open.apply(this,arguments);
    };
    document.addEventListener('click',lazy(bionic));
}

window.addEventListener('load',lazy(bionic));
document.addEventListener("DOMContentLoaded",lazy(bionic));