i-v2ex

v2exMarkdown

为v2ex而生的markdown渲染
当前为 2018-06-17 提交的版本，查看最新版本。
换行
// ==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, '![]( ' + encodeURI('$1$2') + ' )');
        }
        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, '&#x23;$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, '![]($2)'); // 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(/&amp;/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");
})();
欢迎访问Greasy Fork镜像
