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third_party/Python-Markdown/markdown/extensions/abbr.py

Index: third_party/Python-Markdown/markdown/extensions/abbr.py
diff --git a/third_party/Python-Markdown/markdown/extensions/abbr.py b/third_party/Python-Markdown/markdown/extensions/abbr.py
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+'''
+Abbreviation Extension for Python-Markdown
+==========================================
+
+This extension adds abbreviation handling to Python-Markdown.
+
+See <https://pythonhosted.org/Markdown/extensions/abbreviations.html>
+for documentation.
+
+Oringinal code Copyright 2007-2008 [Waylan Limberg](http://achinghead.com/) and
+ [Seemant Kulleen](http://www.kulleen.org/)
+
+All changes Copyright 2008-2014 The Python Markdown Project
+
+License: [BSD](http://www.opensource.org/licenses/bsd-license.php)
+
+'''
+
+from __future__ import absolute_import
+from __future__ import unicode_literals
+from . import Extension
+from ..preprocessors import Preprocessor
+from ..inlinepatterns import Pattern
+from ..util import etree, AtomicString
+import re
+
+# Global Vars
+ABBR_REF_RE = re.compile(r'[*]\[(?P<abbr>[^\]]*)\][ ]?:\s*(?P<title>.*)')
+
+
+class AbbrExtension(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(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(Pattern):
+    """ Abbreviation inline pattern. """
+
+    def __init__(self, pattern, title):
+        super(AbbrPattern, self).__init__(pattern)
+        self.title = title
+
+    def handleMatch(self, m):
+        abbr = etree.Element('abbr')
+        abbr.text = AtomicString(m.group('abbr'))
+        abbr.set('title', self.title)
+        return abbr
+
+
+def makeExtension(*args, **kwargs):
+    return AbbrExtension(*args, **kwargs)