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bgneal@658
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1 """A more liberal autolinker
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bgneal@356
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2
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3 Inspired by Django's urlize function.
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4
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5 Positive examples:
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6
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7 >>> import markdown
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8 >>> md = markdown.Markdown(extensions=['urlize'])
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9
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10 >>> md.convert('http://example.com/')
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11 u'<p><a href="http://example.com/">http://example.com/</a></p>'
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12
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13 >>> md.convert('go to http://example.com')
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14 u'<p>go to <a href="http://example.com">http://example.com</a></p>'
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15
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16 >>> md.convert('example.com')
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17 u'<p><a href="http://example.com">example.com</a></p>'
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18
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19 >>> md.convert('example.net')
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20 u'<p><a href="http://example.net">example.net</a></p>'
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21
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22 >>> md.convert('www.example.us')
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23 u'<p><a href="http://www.example.us">www.example.us</a></p>'
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24
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25 >>> md.convert('(www.example.us/path/?name=val)')
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26 u'<p>(<a href="http://www.example.us/path/?name=val">www.example.us/path/?name=val</a>)</p>'
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27
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28 >>> md.convert('go to <http://example.com> now!')
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29 u'<p>go to <a href="http://example.com">http://example.com</a> now!</p>'
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30
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31 Negative examples:
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32
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33 >>> md.convert('del.icio.us')
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34 u'<p>del.icio.us</p>'
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35
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36 """
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37
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38 import markdown
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39
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40 # Global Vars
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41 URLIZE_RE = '(%s)' % '|'.join([
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42 r'<(?:f|ht)tps?://[^>]*>',
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43 r'\b(?:f|ht)tps?://[^)<>\s]+[^.,)<>\s]',
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44 r'\bwww\.[^)<>\s]+[^.,)<>\s]',
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45 r'[^(<\s]+\.(?:com|net|org)\b',
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46 ])
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47
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48 class UrlizePattern(markdown.inlinepatterns.Pattern):
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49 """ Return a link Element given an autolink (`http://example/com`). """
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50 def handleMatch(self, m):
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51 url = m.group(2)
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52
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53 if url.startswith('<'):
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54 url = url[1:-1]
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55
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56 text = url
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57
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58 if not url.split('://')[0] in ('http','https','ftp'):
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59 if '@' in url and not '/' in url:
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60 url = 'mailto:' + url
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61 else:
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62 url = 'http://' + url
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63
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64 el = markdown.util.etree.Element("a")
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65 el.set('href', url)
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66 el.text = markdown.util.AtomicString(text)
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67 return el
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68
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69 class UrlizeExtension(markdown.Extension):
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70 """ Urlize Extension for Python-Markdown. """
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71
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72 def extendMarkdown(self, md, md_globals):
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73 """ Replace autolink with UrlizePattern """
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74 md.inlinePatterns['autolink'] = UrlizePattern(URLIZE_RE, md)
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75
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76 def makeExtension(configs=None):
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77 return UrlizeExtension(configs=configs)
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78
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79 if __name__ == "__main__":
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80 import doctest
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81 doctest.testmod()
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