将html转换为markdown代码,Python代码库,德仔网

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【Python】将html转换为markdown
作者:Dezai.CN / 发布于2013/7/1/ 669

	markdown格式要比html格式清爽的多，所以在某些场合需要将html转换为markdown，下面是一段转换的代码片段，来自git，有修改：

	#!/usr/bin/env python
	#encoding=utf8

	from HTMLParser import HTMLParser

	import re
	import os
	import sys

	class Html2MarkdownParser(HTMLParser):
	 def __init__(self):
	 self._markdown = ''
	 self._tag_stack = []
	 self._tag_attr_data = {}
	 self._handled_tag_body_data = ''
	 self._convertible_tags = ['a',
	 'b', 'blockquote',
	 'em',
	 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'hr',
	 'ol',
	 'p', 'pre',
	 'strong',
	 'ul']
	 # FIXME: special characters
	 HTMLParser.__init__(self)

	 def _append_to_markdown(self, new_markdown):
	 if len(self._markdown) > 1:
	 if re.match('\s', self._markdown[-1:]):
	 self._markdown += new_markdown
	 else:
	 self._markdown += ' ' + new_markdown
	 else:
	 self._markdown += new_markdown

	 # <a />
	 def handle_start_a(self, attrs):
	 self._tag_attr_data = dict(attrs)

	 def handle_end_a(self):
	 a_tag = ''
	 a_tag += '[' + self._handled_tag_body_data + ']'
	 a_tag += '(' + self._tag_attr_data.get('href')

	 title = self._tag_attr_data.get('title')
	 if title:
	 a_tag += ' "' + title + '") '
	 else:
	 a_tag += ') '
	 self._append_to_markdown(a_tag)

	 # <b />
	 def handle_end_b(self):
	 self._handled_tag_body_data = self._handled_tag_body_data.replace(os.linesep, ' ')
	 self._append_to_markdown('*' + self._handled_tag_body_data + '*')

	 # <blockquote />
	 def handle_end_blockquote(self):
	 blockquote_body = self._handled_tag_body_data.split(os.linesep)

	 for blockquote_line in blockquote_body:
	 blockquote_line = blockquote_line.strip()
	 self._append_to_markdown('> ' + blockquote_line + os.linesep)

	 # <em />
	 def handle_end_em(self):
	 self._handled_tag_body_data = self._handled_tag_body_data.replace(os.linesep, ' ')
	 self._append_to_markdown('*' + self._handled_tag_body_data + '*')

	 # <h1 />
	 def handle_end_h1(self):
	 self._handled_tag_body_data = self._handled_tag_body_data.replace(os.linesep, ' ')
	 self._append_to_markdown('# ' + self._handled_tag_body_data + ' #' + os.linesep)

	 # <h2 />
	 def handle_end_h2(self):
	 self._handled_tag_body_data = self._handled_tag_body_data.replace(os.linesep, ' ')
	 self._append_to_markdown('## ' + self._handled_tag_body_data + ' ##' + os.linesep)

	 # <h3 />
	 def handle_end_h3(self):
	 self._handled_tag_body_data = self._handled_tag_body_data.replace(os.linesep, ' ')
	 self._append_to_markdown('### ' + self._handled_tag_body_data + ' ###' + os.linesep)

	 # <h4 />
	 def handle_end_h4(self):
	 self._handled_tag_body_data = self._handled_tag_body_data.replace(os.linesep, ' ')
	 self._append_to_markdown('#### ' + self._handled_tag_body_data + ' ####' + os.linesep)

	 # <h5 />
	 def handle_end_h5(self):
	 self._handled_tag_body_data = self._handled_tag_body_data.replace(os.linesep, ' ')
	 self._append_to_markdown('##### ' + self._handled_tag_body_data + ' #####' + os.linesep)

	 # <h6 />
	 def handle_end_h6(self):
	 self._handled_tag_body_data = self._handled_tag_body_data.replace(os.linesep, ' ')
	 self._append_to_markdown('###### ' + self._handled_tag_body_data + ' ######' + os.linesep)

	 # <hr />
	 def handle_start_hr(self, attrs):
	 self._append_to_markdown('* * *' + os.linesep)

	 # <li />
	 def handle_end_li(self):
	 if len(self._tag_stack):
	 if self._tag_stack[-1] == 'ol':
	 self._append_to_markdown('1. ' + self._handled_tag_body_data + os.linesep)
	 elif self._tag_stack[-1] == 'ul':
	 self._append_to_markdown('* ' + self._handled_tag_body_data + os.linesep)

	 # <p />
	 def handle_start_p(self, attrs):
	 if len(self._markdown) > 1:
	 if self._markdown[-2:] == '%s%s' % (os.linesep, os.linesep):
	 pass
	 elif self._markdown[-1:] == os.linesep:
	 self._markdown += os.linesep
	 else:
	 self._markdown += os.linesep + os.linesep

	 def handle_end_p(self):
	 self._markdown += '%s%s' % (os.linesep, os.linesep)

	 # <pre />
	 def handle_end_pre(self):
	 code_lines = self._handled_tag_body_data.split('\n')
	 for code_line in code_lines:
	 self._append_to_markdown(' ' + code_line + os.linesep)

	 # <strong />
	 def handle_end_strong(self):
	 self._handled_tag_body_data = self._handled_tag_body_data.replace(os.linesep, ' ')
	 self._append_to_markdown('**' + self._handled_tag_body_data + '**')

	 ## ###
	 def handle_starttag(self, tag, attrs):
	 self._tag_stack.append(tag)
	 try:
	 eval('self.handle_start_' + tag + '(attrs)')
	 except AttributeError, e:
	 pass

	 def handle_endtag(self, tag):
	 self._tag_stack.pop()
	 try:
	 eval('self.handle_end_' + tag + '()')
	 # Collapse three successive CRs into two before moving on
	 while len(self._markdown) > 2 and\
	 self._markdown[-3:] == '%s%s%s' % (os.linesep, os.linesep, os.linesep):
	 self._markdown = self._markdown[:-3] + '%s%s' % (os.linesep, os.linesep)
	 except AttributeError, e:
	 pass

	 self._tag_attr_data = {}
	 self._handled_tag_body_data = ''

	 def handle_data(self, data):
	 data = os.linesep.join(data.strip().split(os.linesep))
	 if len(self._tag_stack) and self._tag_stack[-1] not in ['p']:
	 self._handled_tag_body_data += data
	 else:
	 self._append_to_markdown(data)

	 def get_markdown(self):
	 return self._markdown.rstrip() + '\n'

	def main():
	 p = Html2MarkdownParser()
	 buf = ''' here place your html code'''
	 p.feed(buf)
	 p.close()
	 print p.get_markdown()

	if __name__ == "__main__":
	 sys.exit(main())
	注意这个只可以做有限的转换，table，div等标签是转换不了的。
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