为v2ex而生的markdown渲染
目前为
// ==UserScript==
// @name v2exMarkdown
// @namespace https://github.com/hundan2020/v2exMarkdown
// @version 0.6
// @description 为v2ex而生的markdown渲染
// @author hundan,ccsiyu
// @match https://*.v2ex.com/t/*
// @require https://cdn.staticfile.org/showdown/1.8.6/showdown.js
// @grant none
// ==/UserScript==
(function () {
// markdown有天生的不安全性，这意味着可能导致xss的产生，我正在努力避免这个问题的发生
// jquery.js和highlight.js都由v2ex自身提供，不再向外部重复请求
var preFix = function(rawReply){
var picRe = function(reply){
return reply.replace(/(?:!\[.*?\])?!\[.*?\]\(\s*(https?:\/\/i\.loli\.net\/\d{4}\/\d{2}\/\d{2}\/[a-z0-9]+.[a-z]+)\)|(https:\/\/i\.loli\.net\/\d{4}\/\d{2}\/\d{2}\/[a-z0-9]+.[a-z]+)/ig, ' + ' )');
}
var xssFilter = function(reply){
var sReply = reply;
sReply = sReply.replace(/(!?\[.*?\]\(\s*?javascript.*?\))/igs, '`$1`');
return sReply;
}
var fixedReply = rawReply;
fixedReply = fixedReply.replace(/#(\d{1,3}\s)/ig, '#$1 '); // 避免楼层号加粗 safe
fixedReply = fixedReply.replace(/<a target="_blank" href="(\S+?)"><img src="(\S+?)" class="embedded_image"><\/a>/ig, ''); // 正常显示的图片处理 safe
fixedReply = fixedReply.replace(/@<a href="\/member\/(\S+?)">(\S+?)<\/a>/ig, '@[$1](/member/$2)'); // 论坛内@处理，考虑到代码段中的@应当正常显示 safe
fixedReply = fixedReply.replace(/<a target="_blank" href="(\/t\/\d+)">\/t\/\d+<\/a>/ig, '[$1]($1)'); // 论坛内链处理，考虑到在代码段中应当正常显示 safe
fixedReply = fixedReply.replace(/<a.*? href="(\S+?)".*?>(\S+?)<\/a>/ig, '$2'); // 链接处理 safe
fixedReply = fixedReply.replace(/(\n)?<br *\/?>/ig, "\n"); // 换行处理，避免多行代码无法正常工作 safe
fixedReply = picRe(fixedReply);
fixedReply = xssFilter(fixedReply);
// 不安全的是，从原生markdown格式转变到html
return fixedReply;
}
var endFix = function(markedReply){
var fixedReply = markedReply;
fixedReply = fixedReply.replace(/\n/ig, '<br />'); //safe markdown软回车转硬回车
fixedReply = fixedReply.replace(/(<\/ul>|<\/li>|<\/p>|<\/table>|<\/h\d>)\s*<br\s*\/?>/ig, '$1'); // safe 表格换行删除
fixedReply = fixedReply.replace(/<br\s*\/?>(<li>|<ul>|<p>|<table>|<h\d>)/ig, '$1'); // safe 表格换行删除
fixedReply = fixedReply.replace(/(<\/?table>|<\/?tbody>|<\/?thead>|<\/?tr>|<\/?th>|<\/?td>)<br\s*\/?>/ig, '$1'); // safe 表格换行删除
fixedReply = fixedReply.replace(/(<br\s*\/?>\s*){2,}/ig, '<br />'); // safe 多重换行转单行
fixedReply = fixedReply.replace(/@\[(\S+?)\]\(\/member\/\S+\)/ig, '@$1'); // 代码段中的@ 还原
fixedReply = fixedReply.replace(/\[(\/t\/\d+)\]\(\/t\/\d+\)/ig, '$1'); // 代码段中的内链还原
fixedReply = fixedReply.replace(/&/ig, '&'); // 对重复转义的 & 进行还原，而不必对<>进行操作，有效的避免了XSS发生
return fixedReply;
}
var processMarkdown = function(){
$("div.reply_content").each(function () {
var reply = $(this)[0];
var rawReply = reply.innerHTML;
var converter = new showdown.Converter({
omitExtraWLInCodeBlocks: true,
parseImgDimensions: true,
simplifiedAutoLink: true,
literalMidWordUnderscores: true,
strikethrough: true,
tables: true,
ghCodeBlocks: true,
tasklists: true,
smoothLivePreview: true,
ghCompatibleHeaderId: true,
encodeEmails: true,
emoji: true
});
var markedReply = converter.makeHtml(preFix(rawReply));
reply.innerHTML = endFix(markedReply);
reply.className = 'reply_content markdown_body';
// 开启代码高亮
hljs.configure({useBR: true});
$('div.reply_content code').each(function(i, block) {
hljs.highlightBlock(block);
});
});
}
processMarkdown();
console.clear();
console.log("\n\n\n Thanks for using my script~\n\n\n\n");
})();