Double click on a LaTeX formula on a webpage to copy it to the clipboard
// ==UserScript==
// @name TexCopyer
// @namespace http://tampermonkey.net/
// @version 1.6
// @license GPLv3
// @description 双击网页中的LaTex公式，将其复制到剪切板。支持主流AI网站、知乎、IEEE等等
// @description:en Double click on a LaTeX formula on a webpage to copy it to the clipboard
// @author 3plus10i
// @match *://*.wikipedia.org/*
// @match *://*.zhihu.com/*
// @match *://*.chatgpt.com/*
// @match *://*.stackexchange.com/*
// @match *://oi-wiki.org/*
// @match *://*.doubao.com/*
// @match *://*.deepseek.com/*
// @match *://*.chatboxai.app/*
// @match *://ieeexplore.ieee.org/*
// @match *://*.bohrium.com/*
// @match *://*.gemini.google.com/*
// @match *://aistudio.google.com/*
// @match *://*.grok.com/*
// @match *://x.com/*
// @match *://*.z.ai/*
// @match *://*.qianwen.com/*
// @match *://*.metaso.cn/*
// @match *://*.csdn.net/*
// ==/UserScript==
(function () {
'use strict';
// ---- 工具函数 ----
function formatLatex(input) {
while (input.endsWith(' ') || input.endsWith('\\')) {
input = input.slice(0, -1);
}
return '$' + input + '$';
}
/** 从元素中用 querySelector 安全取值，失败返回空字符串 */
function safeText(el, selector) {
const found = el.querySelector(selector);
return found ? found.textContent : '';
}
/** 从元素中安全读取属性，失败返回空字符串 */
function safeAttr(el, attr) {
const val = el.getAttribute(attr);
return val || '';
}
// ---- 站点配置（按需扩展） ----
const SITE_CONFIGS = [
{
match: u => u.includes('wikipedia.org'),
selector: 'span.mwe-math-element',
extract: el => formatLatex(safeAttr(el.querySelector('math'), 'alttext')),
},
{
match: u => u.includes('zhihu.com'),
selector: 'span.ztext-math',
extract: el => formatLatex(safeAttr(el, 'data-tex')),
},
{
match: u => u.includes('chatgpt.com'),
selector: 'span.katex',
extract: el => formatLatex(safeText(el, 'annotation')),
},
// Kimi (moonshot.cn) — Vue生产构建剥离了内部引用，
// 且仅通过闭包持有LaTeX源码，暂无可靠提取路径。
{
match: u => u.includes('stackexchange.com'),
selector: 'span.math-container',
extract: el => formatLatex(safeText(el, 'script')),
},
{
match: u => u.includes('oi-wiki.org'),
selector: 'mjx-container.MathJax',
extract: el => formatLatex(safeAttr(el.querySelector('mjx-math'), 'data-latex').trim()),
},
{
match: u => u.includes('doubao.com'),
selector: 'span.math-inline',
extract: el => {
const raw = safeAttr(el, 'copy-text');
// 剥离 \( ... \) 包裹
const inner = raw.replace(/^\\\(|\\\)$/g, '');
return inner ? formatLatex(inner) : '';
},
},
{
match: u => u.includes('deepseek.com'),
selector: 'span.katex',
extract: el => formatLatex(safeText(el, 'annotation')),
},
{
match: u => u.includes('chatboxai.app'),
selector: 'span.katex',
extract: el => formatLatex(safeText(el, 'annotation')),
},
{
match: u => u.includes('ieeexplore.ieee.org'),
selector: 'span[id^="MathJax-Element-"][id$="-Frame"]',
extract(el) {
const idMatch = el.id.match(/Element-(\w+)-Frame/);
if (!idMatch) return '';
const scriptEl = document.getElementById(`MathJax-Element-${idMatch[1]}`);
if (!scriptEl) return '';
let latex = scriptEl.textContent;
latex = latex.replace(/\\begin\{equation\*\}/g, '\\[\\begin{array}{l}');
latex = latex.replace(/\\end\{equation\*\}/g, '\\end{array}\\]');
latex = latex.replace(/\\tag\{(\w+)\}/g, '\\\\');
return formatLatex(latex);
},
},
{
match: u => u.includes('bohrium.com'),
selector: '.math.math-inline, .math.math-display',
extract: el => formatLatex(safeText(el, 'annotation[encoding="application/x-tex"]')),
},
{
match: u => u.includes('gemini.google.com'),
selector: '.math-inline, .math-block',
extract: el => formatLatex(safeAttr(el, 'data-math')),
},
{
match: u => u.includes('aistudio.google.com'),
selector: 'ms-katex.inline, .katex-display, span.katex',
extract: el => formatLatex(safeText(el, 'annotation[encoding="application/x-tex"]')),
},
{
match: u => u.includes('grok.com') || u.includes('x.com'),
selector: 'span.katex',
extract: el => formatLatex(safeText(el, 'annotation')),
},
{
match: u => u.includes('z.ai'),
selector: 'span.katex',
extract: el => formatLatex(safeText(el, 'annotation')),
},
{
match: u => u.includes('qianwen.com'),
selector: 'span.katex, .katex-display',
extract: el => formatLatex(safeText(el, 'annotation')),
},
{
match: u => u.includes('metaso.cn'),
selector: 'span.katex',
extract: el => formatLatex(safeText(el, 'annotation')),
},
{
match: u => u.includes('csdn.net'),
selector: 'span.katex',
extract: el => {
const ml = el.querySelector('.katex-mathml');
if (!ml) return '';
// 真正的 LaTeX 表达式始终在最后一行非空文本。
const lines = ml.textContent.split('\n')
.map(s => s.trim())
.filter(s => s.length > 0);
let tex = lines.pop() || '';
tex = tex.replace(/^\\displaystyle\s+/, '');
return formatLatex(tex);
},
},
];
/** 返回当前 URL 匹配的第一个站点配置，无匹配返回 null */
function resolveSite(url) {
return SITE_CONFIGS.find(cfg => cfg.match(url)) || null;
}
// 模块级缓存，页面生命周期内不变
const currentSite = resolveSite(window.location.href);
// ---- DOM / UI ----
const css = `
.latex-tooltip { position: fixed; background-color: rgba(0, 0, 0, 0.85); color: #fff; padding: 5px 10px; border-radius: 5px; font-size: 11px; z-index: 1000; opacity: 0; transition: opacity 0.2s; pointer-events: none; }
`;
const styleSheet = document.createElement('style');
styleSheet.type = 'text/css';
styleSheet.innerText = css;
document.head.appendChild(styleSheet);
const tooltip = document.createElement('div');
tooltip.classList.add('latex-tooltip');
document.body.appendChild(tooltip);
// ---- 事件绑定 ----
const DATA_FLAG = 'data-texcopyer-processed';
let successLock = false; // 复制成功1s内禁止 mouseleave 隐藏 tooltip
function showTooltip(el, text) {
tooltip.textContent = text;
const rect = el.getBoundingClientRect();
tooltip.style.display = 'block';
tooltip.style.left = `${rect.left + rect.width / 2 - tooltip.offsetWidth / 2}px`;
tooltip.style.top = `${rect.top - tooltip.offsetHeight - 5}px`;
tooltip.style.opacity = '0.8';
}
function hideTooltip() {
if (successLock) return;
tooltip.style.display = 'none';
tooltip.style.opacity = '0';
}
function showCopyResult(el) {
successLock = true;
showTooltip(el, '✔ 已复制');
setTimeout(() => {
successLock = false;
hideTooltip();
}, 1000);
}
function bindToNewElements() {
if (!currentSite) return;
document.querySelectorAll(currentSite.selector).forEach(el => {
if (el.hasAttribute(DATA_FLAG)) return;
el.setAttribute(DATA_FLAG, '');
let bindTimer = null;
let clickTimer = null;
let clickCount = 0;
el.addEventListener('mouseenter', function () {
el.style.cursor = 'pointer';
bindTimer = setTimeout(() => showTooltip(el, currentSite.extract(el)), 1000);
});
el.addEventListener('mouseleave', function () {
el.style.cursor = 'auto';
clearTimeout(bindTimer);
clearTimeout(clickTimer);
clickCount = 0;
hideTooltip();
});
el.addEventListener('click', function () {
clickCount++;
if (clickCount === 1) {
clickTimer = setTimeout(() => {
clickCount = 0;
clearTimeout(bindTimer);
showTooltip(el, '💡 双击复制LaTeX公式');
}, 300);
} else {
// click2 within 300ms → double-click
clearTimeout(clickTimer);
clearTimeout(bindTimer);
clickCount = 0;
const latex = currentSite.extract(el);
if (latex) {
console.log(`LaTeX copied: ${latex}`);
navigator.clipboard.writeText(latex).then(() => showCopyResult(el));
}
window.getSelection().removeAllRanges();
}
});
});
}
// 初始绑定 & DOM 变化时重新绑定（防抖 300ms）
document.addEventListener('DOMContentLoaded', bindToNewElements);
let debounceId;
new MutationObserver(() => {
clearTimeout(debounceId);
debounceId = setTimeout(bindToNewElements, 300);
}).observe(document.documentElement, { childList: true, subtree: true });
})();