使用Python来开发Markdown脚本扩展的实例分享

#encoding=utf-8 
##预处理器 
from markdown.preprocessors import Preprocessor 
class CodePreprocessor(Preprocessor): 
  def run(self, lines): 
    new_lines = [] 
    flag_in = False 
    block = [] 
    for line in lines: 
      if line[:3]=='!!!':         
        flag_in = True 
        block.append('<pre class="brush: %s;">' % line[3:].strip()) 
      elif flag_in: 
        if line.strip() and line[0]=='!': 
          block.append(line[1:]) 
        else: 
          flag_in = False 
          block.append('</pre>') 
          block.append(line) 
          new_lines.extend(block) 
          block = [] 
      else: 
        new_lines.append(line) 
    if not new_lines and block: 
      new_lines = block 
    return new_lines 
 
##后置处理器 
from markdown.postprocessors import Postprocessor 
class CodePostprocessor(Postprocessor): 
  def run(self, text): 
    t_list = [] 
    for line in text.split('\n'): 
      if line[:5]=='<p>!<': 
        line = line.lstrip('<p>').replace('</p>', '')[1:] 
      t_list.append(line)  
    return '\n'.join(t_list)   
   
##扩展主体类     
from markdown.extensions import Extension 
from markdown.util import etree 
class CodeExtension(Extension): 
  def __init__(self, configs={}): 
    self.config = configs 
 
  def extendMarkdown(self, md, md_globals): 
    ##注册扩展，用于markdown.reset时扩展同时reset 
    md.registerExtension(self)   
         
    ##设置Preprocessor 
    codepreprocessor = CodePreprocessor() 
    #print md.preprocessors.keys() 
    md.preprocessors.add('codepreprocessor', codepreprocessor, '<normalize_whitespace') 
     
    ##设置Postprocessor 
    codepostprocessor = CodePostprocessor() 
    #print md.postprocessors.keys() 
    md.postprocessors.add('codepostprocessor', codepostprocessor, '>unescape') 
     
    ##print md_globals  ##markdown全局变量 

#encoding=utf-8 
import markdown 
import markdowncode 
 
text = ''''' 
!!!python 
! 
!def foo(): 
 
###title 
''' 
 
configs = {} 
 
myext = markdowncode.CodeExtension(configs=configs) 
md = markdown.markdown(text, extensions=[myext]) 
print md 

!!!python 
! 
!def foo(): 
! return 'foo' 

<pre class="brush: python;"> 
 
def foo(): 
 return 'foo' 
</pre>