双击网页中的LaTex公式，将其复制到剪切板
// ==UserScript==
// @name TexCopyer
// @namespace http://tampermonkey.net/
// @version 1.2
// @license GPLv3
// @description 双击网页中的LaTex公式，将其复制到剪切板
// @description:en Double click on a LaTeX formula on a webpage to copy it to the clipboard
// @author yjy | blime
// @match *://*.wikipedia.org/*
// @match *://*.zhihu.com/*
// @match *://*.chatgpt.com/*
// @match *://*.moonshot.cn/*
// @match *://*.stackexchange.com/*
// @match *://*.kexue.fm/*
// ==/UserScript==
(function() {
'use strict';
// 插入样式表
const css = `
.latex-tooltip { position: fixed; background-color: rgba(0, 0, 0, 0.7); color: #fff; padding: 5px 10px; border-radius: 5px; font-size: 11px; z-index: 1000; opacity: 0; transition: opacity 0.2s; pointer-events: none; }
.latex-copy-success { position: fixed; bottom: 10%; left: 50%; transform: translateX(-50%); background-color: rgba(0, 0, 0, 0.7); color: #fff; padding: 10px 20px; border-radius: 5px; font-size: 12px; z-index: 1000; transition: opacity 0.2s; pointer-events: none; }
`;
const styleSheet = document.createElement("style");
styleSheet.type = "text/css";
styleSheet.innerText = css;
document.head.appendChild(styleSheet);
// 创建提示框元素
const tooltip = document.createElement('div');
tooltip.classList.add('latex-tooltip');
document.body.appendChild(tooltip);
// 获取对象和公式方法
function getTarget(url) {
let target = {elementSelector: '', getLatexString: null}
// 格式化latex
function formatLatex(input) {
while (input.endsWith(' ') || input.endsWith('\\')) {
input = input.slice(0, -1);
}
return '$' + input + '$';
}
if (url.includes('wikipedia.org')) {
target.elementSelector = 'span.mwe-math-element';
target.getLatexString = (element) => formatLatex(element.querySelector('math').getAttribute('alttext'));
return target
} else if (url.includes('zhihu.com')) {
target.elementSelector = 'span.ztext-math';
target.getLatexString = (element) => formatLatex(element.getAttribute('data-tex'));
return target
} else if (url.includes('chatgpt.com')) {
target.elementSelector = 'span.katex';
target.getLatexString = (element) => formatLatex(element.querySelector('annotation').textContent);
return target
} else if (url.includes('moonshot.cn')) {
target.elementSelector = 'span.katex';
target.getLatexString = (element) => formatLatex(element.querySelector('annotation').textContent);
return target
} else if (url.includes('stackexchange.com')) {
target.elementSelector = 'span.math-container';
target.getLatexString = (element) => formatLatex(element.querySelector('script').textContent);
return target
} else if (url.includes('kexue.fm')) {
target.elementSelector = 'math';
target.getLatexString = (element) => formatLatex(element.querySelector('annotation[encoding="application/x-tex"]').textContent);
return target;
}
// 待添加更多网站的条件
return null;
}
// 绑定事件到元素
function addHandler() {
let target = getTarget(window.location.href);
if (!target) return;
let tooltipTimeout;
document.querySelectorAll(target.elementSelector).forEach(element => {
element.addEventListener('mouseenter', function () {
element.style.cursor = "pointer";
tooltipTimeout = setTimeout(function () {
tooltip.textContent = getTarget(window.location.href).getLatexString(element);;
const rect = element.getBoundingClientRect();
tooltip.style.left = `${rect.left}px`;
tooltip.style.top = `${rect.top - tooltip.offsetHeight - 5}px`;
tooltip.style.display = 'block';
tooltip.style.opacity = '0.8';
}, 1000); // 进入延迟1秒
});
element.addEventListener('mouseleave', function () {
element.style.cursor = "auto";
clearTimeout(tooltipTimeout);
tooltip.style.display = 'none';
tooltip.style.opacity = '0';
});
element.ondblclick = function() {
const latexString = target.getLatexString(element)
if (latexString !== null) {
console.log(`LaTeX copied: ${latexString}`) // for debug
navigator.clipboard.writeText(latexString).then(() => {
showCopySuccessTooltip();
});
}
// 取消网页上的选中状态(不是很优雅)
window.getSelection().removeAllRanges();
};
});
}
// 显示复制成功提示
function showCopySuccessTooltip() {
const copyTooltip = document.createElement("div");
copyTooltip.className = "latex-copy-success";
copyTooltip.innerText = "已复制LaTeX公式";
document.body.appendChild(copyTooltip);
setTimeout(() => {
copyTooltip.style.opacity = "0";
setTimeout(() => {
document.body.removeChild(copyTooltip);
}, 200); // 与transition时间匹配
}, 1000); // 提示短时间后消失
}
// 监听页面加载或变化，绑定事件
document.addEventListener('DOMContentLoaded', addHandler);
new MutationObserver(addHandler).observe(document.documentElement, {childList: true, subtree: true});
})();