Revert of Check in a simple pure-python based Markdown previewer.

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

-"""
-Attribute List Extension for Python-Markdown
-============================================
-
-Adds attribute list syntax. Inspired by
-[maruku](http://maruku.rubyforge.org/proposal.html#attribute_lists)'s
-feature of the same name.
-
-See <https://pythonhosted.org/Markdown/extensions/attr_list.html>
-for documentation.
-
-Original code Copyright 2011 [Waylan Limberg](http://achinghead.com/).
-
-All changes Copyright 2011-2014 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 ..treeprocessors import Treeprocessor
-from ..util import isBlockLevel
-import re
-
-try:
-    Scanner = re.Scanner
-except AttributeError:  # pragma: no cover
-    # must be on Python 2.4
-    from sre import Scanner
-
-
-def _handle_double_quote(s, t):
-    k, v = t.split('=')
-    return k, v.strip('"')
-
-
-def _handle_single_quote(s, t):
-    k, v = t.split('=')
-    return k, v.strip("'")
-
-
-def _handle_key_value(s, t):
-    return t.split('=')
-
-
-def _handle_word(s, t):
-    if t.startswith('.'):
-        return '.', t[1:]
-    if t.startswith('#'):
-        return 'id', t[1:]
-    return t, t
-
-_scanner = Scanner([
-    (r'[^ ]+=".*?"', _handle_double_quote),
-    (r"[^ ]+='.*?'", _handle_single_quote),
-    (r'[^ ]+=[^ =]+', _handle_key_value),
-    (r'[^ =]+', _handle_word),
-    (r' ', None)
-])
-
-
-def get_attrs(str):
-    """ Parse attribute list and return a list of attribute tuples. """
-    return _scanner.scan(str)[0]
-
-
-def isheader(elem):
-    return elem.tag in ['h1', 'h2', 'h3', 'h4', 'h5', 'h6']
-
-
-class AttrListTreeprocessor(Treeprocessor):
-
-    BASE_RE = r'\{\:?([^\}]*)\}'
-    HEADER_RE = re.compile(r'[ ]+%s[ ]*$' % BASE_RE)
-    BLOCK_RE = re.compile(r'\n[ ]*%s[ ]*$' % BASE_RE)
-    INLINE_RE = re.compile(r'^%s' % BASE_RE)
-    NAME_RE = re.compile(r'[^A-Z_a-z\u00c0-\u00d6\u00d8-\u00f6\u00f8-\u02ff'
-                         r'\u0370-\u037d\u037f-\u1fff\u200c-\u200d'
-                         r'\u2070-\u218f\u2c00-\u2fef\u3001-\ud7ff'
-                         r'\uf900-\ufdcf\ufdf0-\ufffd'
-                         r'\:\-\.0-9\u00b7\u0300-\u036f\u203f-\u2040]+')
-
-    def run(self, doc):
-        for elem in doc.getiterator():
-            if isBlockLevel(elem.tag):
-                # Block level: check for attrs on last line of text
-                RE = self.BLOCK_RE
-                if isheader(elem) or elem.tag == 'dt':
-                    # header or def-term: check for attrs at end of line
-                    RE = self.HEADER_RE
-                if len(elem) and elem.tag == 'li':
-                    # special case list items. children may include a ul or ol.
-                    pos = None
-                    # find the ul or ol position
-                    for i, child in enumerate(elem):
-                        if child.tag in ['ul', 'ol']:
-                            pos = i
-                            break
-                    if pos is None and elem[-1].tail:
-                        # use tail of last child. no ul or ol.
-                        m = RE.search(elem[-1].tail)
-                        if m:
-                            self.assign_attrs(elem, m.group(1))
-                            elem[-1].tail = elem[-1].tail[:m.start()]
-                    elif pos is not None and pos > 0 and elem[pos-1].tail:
-                        # use tail of last child before ul or ol
-                        m = RE.search(elem[pos-1].tail)
-                        if m:
-                            self.assign_attrs(elem, m.group(1))
-                            elem[pos-1].tail = elem[pos-1].tail[:m.start()]
-                    elif elem.text:
-                        # use text. ul is first child.
-                        m = RE.search(elem.text)
-                        if m:
-                            self.assign_attrs(elem, m.group(1))
-                            elem.text = elem.text[:m.start()]
-                elif len(elem) and elem[-1].tail:
-                    # has children. Get from tail of last child
-                    m = RE.search(elem[-1].tail)
-                    if m:
-                        self.assign_attrs(elem, m.group(1))
-                        elem[-1].tail = elem[-1].tail[:m.start()]
-                        if isheader(elem):
-                            # clean up trailing #s
-                            elem[-1].tail = elem[-1].tail.rstrip('#').rstrip()
-                elif elem.text:
-                    # no children. Get from text.
-                    m = RE.search(elem.text)
-                    if not m and elem.tag == 'td':
-                        m = re.search(self.BASE_RE, elem.text)
-                    if m:
-                        self.assign_attrs(elem, m.group(1))
-                        elem.text = elem.text[:m.start()]
-                        if isheader(elem):
-                            # clean up trailing #s
-                            elem.text = elem.text.rstrip('#').rstrip()
-            else:
-                # inline: check for attrs at start of tail
-                if elem.tail:
-                    m = self.INLINE_RE.match(elem.tail)
-                    if m:
-                        self.assign_attrs(elem, m.group(1))
-                        elem.tail = elem.tail[m.end():]
-
-    def assign_attrs(self, elem, attrs):
-        """ Assign attrs to element. """
-        for k, v in get_attrs(attrs):
-            if k == '.':
-                # add to class
-                cls = elem.get('class')
-                if cls:
-                    elem.set('class', '%s %s' % (cls, v))
-                else:
-                    elem.set('class', v)
-            else:
-                # assign attr k with v
-                elem.set(self.sanitize_name(k), v)
-
-    def sanitize_name(self, name):
-        """
-        Sanitize name as 'an XML Name, minus the ":"'.
-        See http://www.w3.org/TR/REC-xml-names/#NT-NCName
-        """
-        return self.NAME_RE.sub('_', name)
-
-
-class AttrListExtension(Extension):
-    def extendMarkdown(self, md, md_globals):
-        md.treeprocessors.add(
-            'attr_list', AttrListTreeprocessor(md), '>prettify'
-        )
-
-
-def makeExtension(*args, **kwargs):
-    return AttrListExtension(*args, **kwargs)