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authorWaylan Limberg <waylan@gmail.com>2008-11-05 15:49:02 -0500
committerWaylan Limberg <waylan@gmail.com>2008-11-05 15:53:14 -0500
commit36abb1d12c0def034725b840ac200b6813cf5828 (patch)
tree29f5fbd963e80799b44a0905e01436d4508d5e54 /markdown_extensions/abbr.py
parent9c6bf2b66f6eabadc6e9944878ca8c1142ea8e0d (diff)
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Added Abbreviation Extension. Tests included
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+'''
+Abbreviation Extension for Python-Markdown
+==========================================
+
+This extension adds abbreviation handling to Python-Markdown.
+
+Simple Usage:
+
+ >>> import markdown
+ >>> text = """
+ ... Some text with an ABBR and a REF. Ignore REFERENCE and ref.
+ ...
+ ... *[ABBR]: Abbreviation
+ ... *[REF]: Abbreviation Reference
+ ... """
+ >>> markdown.markdown(text, ['abbr'])
+ u'<p>Some text with an <abbr title="Abbreviation">ABBR</abbr> and a <abbr title="Abbreviation Reference">REF</abbr>. Ignore REFERENCE and ref.</p>'
+
+Copyright 2007-2008
+* [Waylan Limberg](http://achinghead.com/)
+* [Seemant Kulleen](http://www.kulleen.org/)
+
+
+'''
+
+import markdown, re
+from markdown import etree
+
+# Global Vars
+ABBR_REF_RE = re.compile(r'[*]\[(?P<abbr>[^\]]*)\][ ]?:\s*(?P<title>.*)')
+
+class AbbrExtension(markdown.Extension):
+ """ Abbreviation Extension for Python-Markdown. """
+
+ def extendMarkdown(self, md, md_globals):
+ """ Insert AbbrPreprocessor before ReferencePreprocessor. """
+ md.preprocessors.add('abbr', AbbrPreprocessor(md), '<reference')
+
+
+class AbbrPreprocessor(markdown.Preprocessor):
+ """ Abbreviation Preprocessor - parse text for abbr references. """
+
+ def run(self, lines):
+ '''
+ Find and remove all Abbreviation references from the text.
+ Each reference is set as a new AbbrPattern in the markdown instance.
+
+ '''
+ new_text = []
+ for line in lines:
+ m = ABBR_REF_RE.match(line)
+ if m:
+ abbr = m.group('abbr').strip()
+ title = m.group('title').strip()
+ self.markdown.inlinePatterns['abbr-%s'%abbr] = \
+ AbbrPattern(self._generate_pattern(abbr), title)
+ else:
+ new_text.append(line)
+ return new_text
+
+ def _generate_pattern(self, text):
+ '''
+ Given a string, returns an regex pattern to match that string.
+
+ 'HTML' -> r'(?P<abbr>[H][T][M][L])'
+
+ Note: we force each char as a literal match (in brackets) as we don't
+ know what they will be beforehand.
+
+ '''
+ chars = list(text)
+ for i in range(len(chars)):
+ chars[i] = r'[%s]' % chars[i]
+ return r'(?P<abbr>\b%s\b)' % (r''.join(chars))
+
+
+class AbbrPattern(markdown.Pattern):
+ """ Abbreviation inline pattern. """
+
+ def __init__(self, pattern, title):
+ markdown.Pattern.__init__(self, pattern)
+ self.title = title
+
+ def handleMatch(self, m):
+ abbr = etree.Element('abbr')
+ abbr.text = m.group('abbr')
+ abbr.set('title', self.title)
+ return abbr
+
+def makeExtension(configs=None):
+ return AbbrExtension(configs=configs)
+
+if __name__ == "__main__":
+ import doctest
+ doctest.testmod()