i-v2ex

v2exMarkdown

为v2ex而生的markdown渲染
目前为 2018-07-16 提交的版本。查看最新版本。
Wrap lines
// ==UserScript==
// @name         v2exMarkdown
// @version      0.62
// @description  为v2ex而生的markdown渲染
// @author       hundan
// @match        https://*.v2ex.com/t/*
// @require      https://cdn.staticfile.org/showdown/1.8.6/showdown.js
// @grant        none
// @namespace https://github.com/hundan2020/v2exMarkdown
// ==/UserScript==
 
 
(function () {
    // 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){
            reply =  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') + ' )'); // sm.ms
            reply =  reply.replace(/(?:!\[.*?\])?!\[.*?\]\(\s*((?:https?)?:\/\/imgurl\.org\/temp\/\d{4}\/[a-z0-9]+\.[a-z0-9]+)\)|(https?:\/\/imgurl\.org\/temp\/\d{4}\/[a-z0-9]+\.[a-z0-9]+)/ig, '![]( ' + encodeURI('$1$2') + ' )'); // 小z图床
            reply =  reply.replace(/(?<!http:|https:)\/\/([a-z0-9]+\.sinaimg.cn\/(?:[a-z]+)\/[a-z0-9]+\.(?:jpg|png|gif|bmp))/ig, '![]( ' + encodeURI('https://$1') + ' )'); // 新浪微博不规则图片链接
            return reply;
        }
        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
        debugger;
        fixedReply = fixedReply.replace(/(!\[(\S*?)\]\(\s+?)<a target="_blank" href="(\S+?)".*?><img src="(\S+?)" class="embedded_image".*?><\/a>\)+/ig, '![$2]($3)'); // 正常显示的图片处理 safe
        fixedReply = fixedReply.replace(/&lt;img src="(.+?)" \/&gt;/ig, '$1'); // 不规则图片链接处理 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");
})();
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