text: """
  Smart Symbols.
  
  pymdownx.smartsymbols
  Really simple plugin to add support for:
    copyright, trademark, and registered symbols
    plus/minus, not equal, arrows via:
  
      copyrite   = (c)
      trademart  = (tm)
      registered = (r)
      plus/minus = +/-
      care/of    = c/o
      fractions  = 1/2 etc.
          (only certain available unicode fractions)
      arrows:
          left   = <--
          right  = -->
          both   = <-->
      not equal  = =/=
         (maybe this could be =/= in the future as this might be more
          intuitive to non-programmers)
  
  MIT license.
  
  Copyright (c) 2014 - 2017 Isaac Muse <isaacmuse@gmail.com>
  
  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
  documentation files (the "Software"), to deal in the Software without restriction, including without limitation
  the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
  and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in all copies or substantial portions
  of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
  TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
  CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  DEALINGS IN THE SOFTWARE.
  """
  from __future__ import unicode_literals
  from markdown import Extension
  from markdown.inlinepatterns import HtmlPattern
  from markdown.odict import OrderedDict
  from markdown.treeprocessors import InlineProcessor
  
  RE_TRADE = ("smart-trademark", r'\(tm\)', r'&trade;')
  RE_COPY = ("smart-copyright", r'\(c\)', r'&copy;')
  RE_REG = ("smart-registered", r'\(r\)', r'&reg;')
  RE_PLUSMINUS = ("smart-plus-minus", r'\+/-', r'&plusmn;')
  RE_NOT_EQUAL = ("smart-not-equal", r'=/=', r'&ne;')
  RE_CARE_OF = ("smart-care-of", r'\bc/o\b', r'&#8453;')
  RE_ORDINAL_NUMBERS = (
      "smart-ordinal-numbers",
      r'''(?x)
      \b
      (?P<leading>(?:[1-9][0-9]*)?)
      (?P<tail>(?<=1)(?:1|2|3)th|1st|2nd|3rd|[04-9]th)
      \b
      ''',
      lambda m: '%s%s<sup>%s</sup>' % (
          m.group('leading') if m.group('leading') else '',
          m.group('tail')[:-2], m.group('tail')[1:]
      )
  )
  RE_ARROWS = (
      "smart-arrows",
      r'(?P<arrows>\<-{2}\>|(?<!-)-{2}\>|\<-{2}(?!-))',
      lambda m: ARR[m.group('arrows')]
  )
  RE_FRACTIONS = (
      "smart-fractions",
      r'(?<!\d)(?P<fractions>1/4|1/2|3/4|1/3|2/3|1/5|2/5|3/5|4/5|1/6|5/6|1/8|3/8|5/8|7/8)(?!\d)',
      lambda m: FRAC[m.group('fractions')]
  )
  
  REPL = {
      'trademark': RE_TRADE,
      'copyright': RE_COPY,
      'registered': RE_REG,
      'plusminus': RE_PLUSMINUS,
      'arrows': RE_ARROWS,
      'notequal': RE_NOT_EQUAL,
      'fractions': RE_FRACTIONS,
      'ordinal_numbers': RE_ORDINAL_NUMBERS,
      'care_of': RE_CARE_OF
  }
  
  FRAC = {
      "1/4": "&frac14;",
      "1/2": "&frac12;",
      "3/4": "&frac34;",
      "1/3": "&#8531;",
      "2/3": "&#8532;",
      "1/5": "&#8533;",
      "2/5": "&#8534;",
      "3/5": "&#8535;",
      "4/5": "&#8536;",
      "1/6": "&#8537;",
      "5/6": "&#8538;",
      "1/8": "&#8539;",
      "3/8": "&#8540;",
      "5/8": "&#8541;",
      "7/8": "&#8542;"
  }
  
  ARR = {
      '-->': "&rarr;",
      '<--': "&larr;",
      '<-->': "&harr;"
  }
  
  
  class SmartSymbolsPattern(HtmlPattern):
      """Smart symbols patterns handler."""
  
      def __init__(self, pattern, replace, md):
          """Setup replace pattern."""
  
          super(SmartSymbolsPattern, self).__init__(pattern)
          self.replace = replace
          self.md = md
  
      def handleMatch(self, m):
          """Replace symbol."""
  
          return self.md.htmlStash.store(
              m.expand(self.replace(m) if callable(self.replace) else self.replace),
              safe=True
          )
  
  
  class SmartSymbolsExtension(Extension):
      """Smart Symbols extension."""
  
      def __init__(self, *args, **kwargs):
          """Setup config of which symbols are enabled."""
  
          self.config = {
              'trademark': [True, 'Trademark'],
              'copyright': [True, 'Copyright'],
              'registered': [True, 'Registered'],
              'plusminus': [True, 'Plus/Minus'],
              'arrows': [True, 'Arrows'],
              'notequal': [True, 'Not Equal'],
              'fractions': [True, 'Fractions'],
              'ordinal_numbers': [True, 'Ordinal Numbers'],
              'care_of': [True, 'Care/of']
          }
          super(SmartSymbolsExtension, self).__init__(*args, **kwargs)
  
      def add_pattern(self, patterns, md):
          """Construct the inline symbol pattern."""
  
          self.patterns.add(
              patterns[0],
              SmartSymbolsPattern(patterns[1], patterns[2], md),
              '_begin'
          )
  
      def extendMarkdown(self, md, md_globals):
          """Create a dict of inline replace patterns and add to the treeprocessor."""
  
          configs = self.getConfigs()
          self.patterns = OrderedDict()
  
          for k, v in REPL.items():
              if configs[k]:
                  self.add_pattern(v, md)
  
          inline_processor = InlineProcessor(md)
          inline_processor.inlinePatterns = self.patterns
          md.treeprocessors.add('smart-symbols', inline_processor, '_end')
          if "smarty" in md.treeprocessors.keys():
              md.treeprocessors.link('smarty', '_end')
  
  
  def makeExtension(*args, **kwargs):
      """Return extension."""
  
      return SmartSymbolsExtension(*args, **kwargs)
  