如何用Python实现简单的Markdown转换器

2018-10-15 17:35

阅读:566

今天心血来潮,写了一个 Markdown 转换器。

import os, re,webbrowser text = # TextHeader ## Header1 List - 1 - 2 - 3 > **quote** 》 quote2 ## Header2 1. *斜体* 2. [@以茄之名](、 ![](文章地址](·**code1**· - [x]是否点赞

程序开头先处理一些行内的语法,比如 code、strong、i 等,用正则直接替换:

接着是复杂一点的图片和链接:

text = re.sub(re.compile(([^\!])\[([^\]]+)\]\(([^)]+)\)), r\1<a href=\3 rel=external nofollow >\2</a>, text) text = re.sub(re.compile(\!\[([^\]]*)\]\(([^)]+)\)), r<img src=\2 >, text)

接着就处理其他的语法,先把文本按每一行分开:

lines = text.split(\n) html = list_flag =

处理列表和待办事项的问题:

for line in lines: line = line.strip( ) if re.match(- \[[ x]\], line): print(matched) p_html = if re.match(- \[x\], line): p_html = checked=checked line = re.sub(- \[[ x]\], , line) html += <label class=cssCheckbox> <input type=checkbox %s /> <span></span>%s </label> % (p_html, line)

因为有序列表和无序列表的区别是头尾的ol和ul,所以要用 list_flag 变量来判断

elif re.match([\+\-\*] , line): if list_flag == : html += <ul>\n list_flag = ul line = re.sub([\+\-\*] , , line) html += <li>%s</li>\n % (line) elif re.match([\d]+[.、] , line): if list_flag == : list_flag = ol html += <ol>\n line = re.sub([\d]+[.、] , , line) html += <li>%s</li>\n % (line)

处理完后处理其他的语法:

else: if list_flag != : html += </%s>\n % list_flag list_flag = if re.match(\#+, line): well = re.match(\#+, line).group().count(#) line = re.sub(\#+, , line) html += <h%i>%s</h%i>\n % (well, line, well) elif re.match([>》 ], line): line = re.sub(^\s*[>》 ], , line) html += <blockquote>%s</blockquote>\n % (line) # elif re.match([>》 ], line): # line = re.sub(^\s*[>》 ], , line) # html += <blockquote>%s</blockquote>\n % (line) else: html += line

这里我稍微修改了一点,让 > 和 》 都可以转换成引用,主要是切换中英文标点太难了。

然后就是添加 CSS,自己改了一点马克飞象的进去,因为他的引用做得很漂亮:

with open(markdown.html, w, encoding=utf-8)as f: f.write( <html> <head> <meta http-equiv=Content-Type content=text/html; charset=utf-8 /> <style>body{ margin: 0 auto; font-family: ubuntu, Tahoma, Microsoft YaHei, arial,sans-serif; color: #444444; line-height: 1; padding: 30px; } input[type=checkbox]+span::before { content: ;/*不换行空格*/ display: inline-block; vertical-align: 0.2em; width:0.8em; height:0.8em; margin-right: .2em; border-radius:.2em; background: silver;/*复选框的背景色*/ text-indent:0.15em; line-height: 0.65; } input[type=checkbox] { /*隐藏掉原先实际的 checkbox 框,之所以没用 display:none; 这种简单直接的方式,是因为这种方法会把它从键盘 tab 键切换焦点的队列中完全删除*/ position: absolute; clip:rect(0,0,0,0); } input[type=checkbox]:checked+span::before { content:\u221a; /*对号的 Unicode字符*/ background: yellowgreen;/*对号的颜色*/ } img { max-width: 100%; } @media screen and (min-width: 1000px) { body { width: 842px; margin: 10px auto; } } h1, h2, h3, h4 { color: #111111; font-weight: 400; margin-top: 1em; } h1, h2, h3, h4, h5 { font-family: Georgia, Palatino, serif; } h1, h2, h3, h4, h5, dl{ margin-bottom: 16px; padding: 0; } p { margin-top: 8px; margin-bottom: 3px; } h1 { font-size: 48px; line-height: 54px; } h2 { font-size: 36px; line-height: 42px; } h1, h2 { border-bottom: 1px solid #EFEAEA; padding-bottom: 10px; } h3 { font-size: 24px; line-height: 30px; } h4 { font-size: 21px; line-height: 26px; } h5 { font-size: 18px; line-height: 23px; } a { color: #0099ff; margin: 0 2px; padding: 0; vertical-align: baseline; text-decoration: none; } a:hover { text-decoration: none; color: #ff6600; } a:visited { /*color: purple;*/ } ul, ol { padding: 0; padding-left: 18px; margin: 0; } li { line-height: 24px; } p, ul, ol { font-size: 16px; line-height: 24px; } ol ol, ul ol { list-style-type: lower-roman; } code, pre { font-family: Consolas, Monaco, Andale Mono, monospace; background-color:#f7f7f7; color: inherit; } code { font-family: Consolas, Monaco, Andale Mono, monospace; margin: 0 2px; } pre { font-family: Consolas, Monaco, Andale Mono, monospace; line-height: 1.7em; overflow: auto; padding: 6px 10px; border-left: 5px solid #6CE26C; } pre > code { font-family: Consolas, Monaco, Andale Mono, monospace; border: 0; display: inline; max-width: initial; padding: 0; margin: 0; overflow: initial; line-height: 1.6em; font-size: .95em; white-space: pre; background: 0 0; } code { color: #666555; } aside { display: block; float: right; width: 390px; } blockquote { border-left-width: 10px; background-color: rgba(102,128,153,0.05); border-top-right-radius: 5px; border-bottom-right-radius: 5px; padding: 15px 20px; } blockquote cite { font-size:14px; line-height:20px; color:#bfbfbf; } blockquote cite:before { content: \2014 \00A0; } blockquote p { color: #666; } hr { text-align: left; color: #999; height: 2px; padding: 0; margin: 16px 0; background-color: #e7e7e7; border: 0 none; } dl { padding: 0; } dl dt { padding: 10px 0; margin-top: 16px; font-size: 1em; font-style: italic; font-weight: bold; } dl dd { padding: 0 16px; margin-bottom: 16px; } dd { margin-left: 0; } table { *border-collapse: collapse; /* IE7 and lower */ border-spacing: 0; width: 100%; } table { border: solid #ccc 1px; } table thead { background: #f7f7f7; } table thead tr:hover { background: #f7f7f7 } table tr:hover { background: #fbf8e9; -o-transition: all 0.1s ease-in-out; -webkit-transition: all 0.1s ease-in-out; -moz-transition: all 0.1s ease-in-out; -ms-transition: all 0.1s ease-in-out; transition: all 0.1s ease-in-out; } table td, .table th { border-left: 1px solid #ccc; border-top: 1px solid #ccc; padding: 10px; text-align: left; } table th { border-top: none; text-shadow: 0 1px 0 rgba(255,255,255,.5); padding: 5px; border-left: 1px solid #ccc; } table td:first-child, table th:first-child { border-left: none; }</style></head>) f.write(html) f.write(</html>)

用 Chrome 打开网页:

webbrowser.get(C:/Program Files (x86)/CentBrowser/Application/chrome.exe %s).open( file:///+os.getcwd()+/markdown.html)

话说这里也是个坑,系统自带的 Edge 一直打开失败,用那个注册器注册 Chrome 也没办法用 ,最后还是在外网找到了解决方案。

最后的效果:

以上就是本文的全部内容,希望对大家的学习有所帮助,也希望大家多多支持脚本之家。


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