// ==UserScript==
// @name         知乎latex
// @namespace    http://tampermonkey.net/
// @version      0.6
// @description  单击显示latex原代码
// @author       letshaveFun
// @match        *://*.zhihu.com/*
// @icon         https://static.zhihu.com/heifetz/favicon.ico
// @grant        none
// @license      GPLv3
// ==/UserScript==
(function() {
'use strict';
function getSelected() {
if (window.getSelection) {
return window.getSelection().toString();
} else if (document.getSelection) {
return document.getSelection().toString();
} else {
var selection = document.selection && document.selection.createRange();
if (selection.text) {
return selection.text.toString();
}
return "";
}
}
function createDOMContentLoadedHandler() {
const svg = document.querySelectorAll('.MathJax_SVG');
const preview = document.querySelectorAll('.math-holder');
if (svg.length){
svg.forEach(e => {
e.addEventListener('click', () => {
if (!e.dataset.clicked) {
if (!e.parentNode.classList.contains('MathJax_SVG_Display')) {
e.style.display = 'none';
e.nextElementSibling.nextElementSibling.style.display = 'inline';
e.nextElementSibling.nextElementSibling.innerText = '$' + e.parentNode.parentNode.dataset.tex + '$';
e.dataset.clicked = true;
if (e.nextElementSibling.nextElementSibling.dataset.clicked) {
e.nextElementSibling.nextElementSibling.removeAttribute('data-clicked');
}
} else {
e.style.display = 'none';
e.parentNode.nextElementSibling.nextElementSibling.style.display = 'inline';
e.parentNode.nextElementSibling.nextElementSibling.innerText = '$$</br>' + e.parentNode.parentNode.parentNode.dataset.tex + '</br>$$';
e.dataset.clicked = true;
if (e.parentNode.nextElementSibling.nextElementSibling.dataset.clicked) {
e.parentNode.nextElementSibling.nextElementSibling.removeAttribute('data-clicked');
}
}
}
}
);
});
}
if (preview.length){
preview.forEach(e => {
e.addEventListener('click', function() {
if (!getSelected()) {
if (!e.dataset.clicked) {
e.style.display = 'none';
e.parentNode.querySelector('.MathJax_SVG').style.display = 'inline';
e.dataset.clicked = true;
if (e.parentNode.querySelector('.MathJax_SVG').dataset.clicked) {
e.parentNode.querySelector('.MathJax_SVG').removeAttribute('data-clicked');
}
}
}
});
});
}
}
document.addEventListener('DOMContentLoaded', createDOMContentLoadedHandler);
new MutationObserver(createDOMContentLoadedHandler).observe(document.documentElement, {childList: true, subtree: true});
})();