--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/env/lib/python3.7/site-packages/mistune.py	Sat May 02 07:14:21 2020 -0400
@@ -0,0 +1,1184 @@
+# coding: utf-8
+"""
+    mistune
+    ~~~~~~~
+
+    The fastest markdown parser in pure Python with renderer feature.
+
+    :copyright: (c) 2014 - 2018 by Hsiaoming Yang.
+"""
+
+import re
+import inspect
+
+__version__ = '0.8.4'
+__author__ = 'Hsiaoming Yang <me@lepture.com>'
+__all__ = [
+    'BlockGrammar', 'BlockLexer',
+    'InlineGrammar', 'InlineLexer',
+    'Renderer', 'Markdown',
+    'markdown', 'escape',
+]
+
+
+_key_pattern = re.compile(r'\s+')
+_nonalpha_pattern = re.compile(r'\W')
+_escape_pattern = re.compile(r'&(?!#?\w+;)')
+_newline_pattern = re.compile(r'\r\n|\r')
+_block_quote_leading_pattern = re.compile(r'^ *> ?', flags=re.M)
+_block_code_leading_pattern = re.compile(r'^ {4}', re.M)
+_inline_tags = [
+    'a', 'em', 'strong', 'small', 's', 'cite', 'q', 'dfn', 'abbr', 'data',
+    'time', 'code', 'var', 'samp', 'kbd', 'sub', 'sup', 'i', 'b', 'u', 'mark',
+    'ruby', 'rt', 'rp', 'bdi', 'bdo', 'span', 'br', 'wbr', 'ins', 'del',
+    'img', 'font',
+]
+_pre_tags = ['pre', 'script', 'style']
+_valid_end = r'(?!:/|[^\w\s@]*@)\b'
+_valid_attr = r'''\s*[a-zA-Z\-](?:\s*\=\s*(?:"[^"]*"|'[^']*'|[^\s'">]+))?'''
+_block_tag = r'(?!(?:%s)\b)\w+%s' % ('|'.join(_inline_tags), _valid_end)
+_scheme_blacklist = ('javascript:', 'vbscript:')
+
+
+def _pure_pattern(regex):
+    pattern = regex.pattern
+    if pattern.startswith('^'):
+        pattern = pattern[1:]
+    return pattern
+
+
+def _keyify(key):
+    key = escape(key.lower(), quote=True)
+    return _key_pattern.sub(' ', key)
+
+
+def escape(text, quote=False, smart_amp=True):
+    """Replace special characters "&", "<" and ">" to HTML-safe sequences.
+
+    The original cgi.escape will always escape "&", but you can control
+    this one for a smart escape amp.
+
+    :param quote: if set to True, " and ' will be escaped.
+    :param smart_amp: if set to False, & will always be escaped.
+    """
+    if smart_amp:
+        text = _escape_pattern.sub('&amp;', text)
+    else:
+        text = text.replace('&', '&amp;')
+    text = text.replace('<', '&lt;')
+    text = text.replace('>', '&gt;')
+    if quote:
+        text = text.replace('"', '&quot;')
+        text = text.replace("'", '&#39;')
+    return text
+
+
+def escape_link(url):
+    """Remove dangerous URL schemes like javascript: and escape afterwards."""
+    lower_url = url.lower().strip('\x00\x1a \n\r\t')
+
+    for scheme in _scheme_blacklist:
+        if re.sub(r'[^A-Za-z0-9\/:]+', '', lower_url).startswith(scheme):
+            return ''
+    return escape(url, quote=True, smart_amp=False)
+
+
+def preprocessing(text, tab=4):
+    text = _newline_pattern.sub('\n', text)
+    text = text.expandtabs(tab)
+    text = text.replace('\u2424', '\n')
+    pattern = re.compile(r'^ +$', re.M)
+    return pattern.sub('', text)
+
+
+class BlockGrammar(object):
+    """Grammars for block level tokens."""
+
+    def_links = re.compile(
+        r'^ *\[([^^\]]+)\]: *'  # [key]:
+        r'<?([^\s>]+)>?'  # <link> or link
+        r'(?: +["(]([^\n]+)[")])? *(?:\n+|$)'
+    )
+    def_footnotes = re.compile(
+        r'^\[\^([^\]]+)\]: *('
+        r'[^\n]*(?:\n+|$)'  # [^key]:
+        r'(?: {1,}[^\n]*(?:\n+|$))*'
+        r')'
+    )
+
+    newline = re.compile(r'^\n+')
+    block_code = re.compile(r'^( {4}[^\n]+\n*)+')
+    fences = re.compile(
+        r'^ *(`{3,}|~{3,}) *([^`\s]+)? *\n'  # ```lang
+        r'([\s\S]+?)\s*'
+        r'\1 *(?:\n+|$)'  # ```
+    )
+    hrule = re.compile(r'^ {0,3}[-*_](?: *[-*_]){2,} *(?:\n+|$)')
+    heading = re.compile(r'^ *(#{1,6}) *([^\n]+?) *#* *(?:\n+|$)')
+    lheading = re.compile(r'^([^\n]+)\n *(=|-)+ *(?:\n+|$)')
+    block_quote = re.compile(r'^( *>[^\n]+(\n[^\n]+)*\n*)+')
+    list_block = re.compile(
+        r'^( *)(?=[*+-]|\d+\.)(([*+-])?(?:\d+\.)?) [\s\S]+?'
+        r'(?:'
+        r'\n+(?=\1?(?:[-*_] *){3,}(?:\n+|$))'  # hrule
+        r'|\n+(?=%s)'  # def links
+        r'|\n+(?=%s)'  # def footnotes\
+        r'|\n+(?=\1(?(3)\d+\.|[*+-]) )'   # heterogeneous bullet
+        r'|\n{2,}'
+        r'(?! )'
+        r'(?!\1(?:[*+-]|\d+\.) )\n*'
+        r'|'
+        r'\s*$)' % (
+            _pure_pattern(def_links),
+            _pure_pattern(def_footnotes),
+        )
+    )
+    list_item = re.compile(
+        r'^(( *)(?:[*+-]|\d+\.) [^\n]*'
+        r'(?:\n(?!\2(?:[*+-]|\d+\.) )[^\n]*)*)',
+        flags=re.M
+    )
+    list_bullet = re.compile(r'^ *(?:[*+-]|\d+\.) +')
+    paragraph = re.compile(
+        r'^((?:[^\n]+\n?(?!'
+        r'%s|%s|%s|%s|%s|%s|%s|%s|%s'
+        r'))+)\n*' % (
+            _pure_pattern(fences).replace(r'\1', r'\2'),
+            _pure_pattern(list_block).replace(r'\1', r'\3'),
+            _pure_pattern(hrule),
+            _pure_pattern(heading),
+            _pure_pattern(lheading),
+            _pure_pattern(block_quote),
+            _pure_pattern(def_links),
+            _pure_pattern(def_footnotes),
+            '<' + _block_tag,
+        )
+    )
+    block_html = re.compile(
+        r'^ *(?:%s|%s|%s) *(?:\n{2,}|\s*$)' % (
+            r'<!--[\s\S]*?-->',
+            r'<(%s)((?:%s)*?)>([\s\S]*?)<\/\1>' % (_block_tag, _valid_attr),
+            r'<%s(?:%s)*?\s*\/?>' % (_block_tag, _valid_attr),
+        )
+    )
+    table = re.compile(
+        r'^ *\|(.+)\n *\|( *[-:]+[-| :]*)\n((?: *\|.*(?:\n|$))*)\n*'
+    )
+    nptable = re.compile(
+        r'^ *(\S.*\|.*)\n *([-:]+ *\|[-| :]*)\n((?:.*\|.*(?:\n|$))*)\n*'
+    )
+    text = re.compile(r'^[^\n]+')
+
+
+class BlockLexer(object):
+    """Block level lexer for block grammars."""
+    grammar_class = BlockGrammar
+
+    default_rules = [
+        'newline', 'hrule', 'block_code', 'fences', 'heading',
+        'nptable', 'lheading', 'block_quote',
+        'list_block', 'block_html', 'def_links',
+        'def_footnotes', 'table', 'paragraph', 'text'
+    ]
+
+    list_rules = (
+        'newline', 'block_code', 'fences', 'lheading', 'hrule',
+        'block_quote', 'list_block', 'block_html', 'text',
+    )
+
+    footnote_rules = (
+        'newline', 'block_code', 'fences', 'heading',
+        'nptable', 'lheading', 'hrule', 'block_quote',
+        'list_block', 'block_html', 'table', 'paragraph', 'text'
+    )
+
+    def __init__(self, rules=None, **kwargs):
+        self.tokens = []
+        self.def_links = {}
+        self.def_footnotes = {}
+
+        if not rules:
+            rules = self.grammar_class()
+
+        self.rules = rules
+        self._max_recursive_depth = kwargs.get('max_recursive_depth', 6)
+        self._list_depth = 0
+        self._blockquote_depth = 0
+
+    def __call__(self, text, rules=None):
+        return self.parse(text, rules)
+
+    def parse(self, text, rules=None):
+        text = text.rstrip('\n')
+
+        if not rules:
+            rules = self.default_rules
+
+        def manipulate(text):
+            for key in rules:
+                rule = getattr(self.rules, key)
+                m = rule.match(text)
+                if not m:
+                    continue
+                getattr(self, 'parse_%s' % key)(m)
+                return m
+            return False  # pragma: no cover
+
+        while text:
+            m = manipulate(text)
+            if m is not False:
+                text = text[len(m.group(0)):]
+                continue
+            if text:  # pragma: no cover
+                raise RuntimeError('Infinite loop at: %s' % text)
+        return self.tokens
+
+    def parse_newline(self, m):
+        length = len(m.group(0))
+        if length > 1:
+            self.tokens.append({'type': 'newline'})
+
+    def parse_block_code(self, m):
+        # clean leading whitespace
+        code = _block_code_leading_pattern.sub('', m.group(0))
+        self.tokens.append({
+            'type': 'code',
+            'lang': None,
+            'text': code,
+        })
+
+    def parse_fences(self, m):
+        self.tokens.append({
+            'type': 'code',
+            'lang': m.group(2),
+            'text': m.group(3),
+        })
+
+    def parse_heading(self, m):
+        self.tokens.append({
+            'type': 'heading',
+            'level': len(m.group(1)),
+            'text': m.group(2),
+        })
+
+    def parse_lheading(self, m):
+        """Parse setext heading."""
+        self.tokens.append({
+            'type': 'heading',
+            'level': 1 if m.group(2) == '=' else 2,
+            'text': m.group(1),
+        })
+
+    def parse_hrule(self, m):
+        self.tokens.append({'type': 'hrule'})
+
+    def parse_list_block(self, m):
+        bull = m.group(2)
+        self.tokens.append({
+            'type': 'list_start',
+            'ordered': '.' in bull,
+        })
+        self._list_depth += 1
+        if self._list_depth > self._max_recursive_depth:
+            self.tokens.append({'type': 'list_item_start'})
+            self.parse_text(m)
+            self.tokens.append({'type': 'list_item_end'})
+        else:
+            cap = m.group(0)
+            self._process_list_item(cap, bull)
+        self.tokens.append({'type': 'list_end'})
+        self._list_depth -= 1
+
+    def _process_list_item(self, cap, bull):
+        cap = self.rules.list_item.findall(cap)
+
+        _next = False
+        length = len(cap)
+
+        for i in range(length):
+            item = cap[i][0]
+
+            # remove the bullet
+            space = len(item)
+            item = self.rules.list_bullet.sub('', item)
+
+            # outdent
+            if '\n ' in item:
+                space = space - len(item)
+                pattern = re.compile(r'^ {1,%d}' % space, flags=re.M)
+                item = pattern.sub('', item)
+
+            # determine whether item is loose or not
+            loose = _next
+            if not loose and re.search(r'\n\n(?!\s*$)', item):
+                loose = True
+
+            rest = len(item)
+            if i != length - 1 and rest:
+                _next = item[rest-1] == '\n'
+                if not loose:
+                    loose = _next
+
+            if loose:
+                t = 'loose_item_start'
+            else:
+                t = 'list_item_start'
+
+            self.tokens.append({'type': t})
+            # recurse
+            self.parse(item, self.list_rules)
+            self.tokens.append({'type': 'list_item_end'})
+
+    def parse_block_quote(self, m):
+        self.tokens.append({'type': 'block_quote_start'})
+        self._blockquote_depth += 1
+        if self._blockquote_depth > self._max_recursive_depth:
+            self.parse_text(m)
+        else:
+            # clean leading >
+            cap = _block_quote_leading_pattern.sub('', m.group(0))
+            self.parse(cap)
+        self.tokens.append({'type': 'block_quote_end'})
+        self._blockquote_depth -= 1
+
+    def parse_def_links(self, m):
+        key = _keyify(m.group(1))
+        self.def_links[key] = {
+            'link': m.group(2),
+            'title': m.group(3),
+        }
+
+    def parse_def_footnotes(self, m):
+        key = _keyify(m.group(1))
+        if key in self.def_footnotes:
+            # footnote is already defined
+            return
+
+        self.def_footnotes[key] = 0
+
+        self.tokens.append({
+            'type': 'footnote_start',
+            'key': key,
+        })
+
+        text = m.group(2)
+
+        if '\n' in text:
+            lines = text.split('\n')
+            whitespace = None
+            for line in lines[1:]:
+                space = len(line) - len(line.lstrip())
+                if space and (not whitespace or space < whitespace):
+                    whitespace = space
+            newlines = [lines[0]]
+            for line in lines[1:]:
+                newlines.append(line[whitespace:])
+            text = '\n'.join(newlines)
+
+        self.parse(text, self.footnote_rules)
+
+        self.tokens.append({
+            'type': 'footnote_end',
+            'key': key,
+        })
+
+    def parse_table(self, m):
+        item = self._process_table(m)
+
+        cells = re.sub(r'(?: *\| *)?\n$', '', m.group(3))
+        cells = cells.split('\n')
+        for i, v in enumerate(cells):
+            v = re.sub(r'^ *\| *| *\| *$', '', v)
+            cells[i] = re.split(r' *(?<!\\)\| *', v)
+
+        item['cells'] = self._process_cells(cells)
+        self.tokens.append(item)
+
+    def parse_nptable(self, m):
+        item = self._process_table(m)
+
+        cells = re.sub(r'\n$', '', m.group(3))
+        cells = cells.split('\n')
+        for i, v in enumerate(cells):
+            cells[i] = re.split(r' *(?<!\\)\| *', v)
+
+        item['cells'] = self._process_cells(cells)
+        self.tokens.append(item)
+
+    def _process_table(self, m):
+        header = re.sub(r'^ *| *\| *$', '', m.group(1))
+        header = re.split(r' *\| *', header)
+        align = re.sub(r' *|\| *$', '', m.group(2))
+        align = re.split(r' *\| *', align)
+
+        for i, v in enumerate(align):
+            if re.search(r'^ *-+: *$', v):
+                align[i] = 'right'
+            elif re.search(r'^ *:-+: *$', v):
+                align[i] = 'center'
+            elif re.search(r'^ *:-+ *$', v):
+                align[i] = 'left'
+            else:
+                align[i] = None
+
+        item = {
+            'type': 'table',
+            'header': header,
+            'align': align,
+        }
+        return item
+
+    def _process_cells(self, cells):
+        for i, line in enumerate(cells):
+            for c, cell in enumerate(line):
+                # de-escape any pipe inside the cell here
+                cells[i][c] = re.sub('\\\\\|', '|', cell)
+
+        return cells
+
+    def parse_block_html(self, m):
+        tag = m.group(1)
+        if not tag:
+            text = m.group(0)
+            self.tokens.append({
+                'type': 'close_html',
+                'text': text
+            })
+        else:
+            attr = m.group(2)
+            text = m.group(3)
+            self.tokens.append({
+                'type': 'open_html',
+                'tag': tag,
+                'extra': attr,
+                'text': text
+            })
+
+    def parse_paragraph(self, m):
+        text = m.group(1).rstrip('\n')
+        self.tokens.append({'type': 'paragraph', 'text': text})
+
+    def parse_text(self, m):
+        text = m.group(0)
+        self.tokens.append({'type': 'text', 'text': text})
+
+
+class InlineGrammar(object):
+    """Grammars for inline level tokens."""
+
+    escape = re.compile(r'^\\([\\`*{}\[\]()#+\-.!_>~|])')  # \* \+ \! ....
+    inline_html = re.compile(
+        r'^(?:%s|%s|%s)' % (
+            r'<!--[\s\S]*?-->',
+            r'<(\w+%s)((?:%s)*?)\s*>([\s\S]*?)<\/\1>' % (
+                _valid_end, _valid_attr),
+            r'<\w+%s(?:%s)*?\s*\/?>' % (_valid_end, _valid_attr),
+        )
+    )
+    autolink = re.compile(r'^<([^ >]+(@|:)[^ >]+)>')
+    link = re.compile(
+        r'^!?\[('
+        r'(?:\[[^^\]]*\]|[^\[\]]|\](?=[^\[]*\]))*'
+        r')\]\('
+        r'''\s*(<)?([\s\S]*?)(?(2)>)(?:\s+['"]([\s\S]*?)['"])?\s*'''
+        r'\)'
+    )
+    reflink = re.compile(
+        r'^!?\[('
+        r'(?:\[[^^\]]*\]|[^\[\]]|\](?=[^\[]*\]))*'
+        r')\]\s*\[([^^\]]*)\]'
+    )
+    nolink = re.compile(r'^!?\[((?:\[[^\]]*\]|[^\[\]])*)\]')
+    url = re.compile(r'''^(https?:\/\/[^\s<]+[^<.,:;"')\]\s])''')
+    double_emphasis = re.compile(
+        r'^_{2}([\s\S]+?)_{2}(?!_)'  # __word__
+        r'|'
+        r'^\*{2}([\s\S]+?)\*{2}(?!\*)'  # **word**
+    )
+    emphasis = re.compile(
+        r'^\b_((?:__|[^_])+?)_\b'  # _word_
+        r'|'
+        r'^\*((?:\*\*|[^\*])+?)\*(?!\*)'  # *word*
+    )
+    code = re.compile(r'^(`+)\s*([\s\S]*?[^`])\s*\1(?!`)')  # `code`
+    linebreak = re.compile(r'^ {2,}\n(?!\s*$)')
+    strikethrough = re.compile(r'^~~(?=\S)([\s\S]*?\S)~~')  # ~~word~~
+    footnote = re.compile(r'^\[\^([^\]]+)\]')
+    text = re.compile(r'^[\s\S]+?(?=[\\<!\[_*`~]|https?://| {2,}\n|$)')
+
+    def hard_wrap(self):
+        """Grammar for hard wrap linebreak. You don't need to add two
+        spaces at the end of a line.
+        """
+        self.linebreak = re.compile(r'^ *\n(?!\s*$)')
+        self.text = re.compile(
+            r'^[\s\S]+?(?=[\\<!\[_*`~]|https?://| *\n|$)'
+        )
+
+
+class InlineLexer(object):
+    """Inline level lexer for inline grammars."""
+    grammar_class = InlineGrammar
+
+    default_rules = [
+        'escape', 'inline_html', 'autolink', 'url',
+        'footnote', 'link', 'reflink', 'nolink',
+        'double_emphasis', 'emphasis', 'code',
+        'linebreak', 'strikethrough', 'text',
+    ]
+    inline_html_rules = [
+        'escape', 'inline_html', 'autolink', 'url', 'link', 'reflink',
+        'nolink', 'double_emphasis', 'emphasis', 'code',
+        'linebreak', 'strikethrough', 'text',
+    ]
+
+    def __init__(self, renderer, rules=None, **kwargs):
+        self.renderer = renderer
+        self.links = {}
+        self.footnotes = {}
+        self.footnote_index = 0
+
+        if not rules:
+            rules = self.grammar_class()
+
+        kwargs.update(self.renderer.options)
+        if kwargs.get('hard_wrap'):
+            rules.hard_wrap()
+
+        self.rules = rules
+
+        self._in_link = False
+        self._in_footnote = False
+        self._parse_inline_html = kwargs.get('parse_inline_html')
+
+    def __call__(self, text, rules=None):
+        return self.output(text, rules)
+
+    def setup(self, links, footnotes):
+        self.footnote_index = 0
+        self.links = links or {}
+        self.footnotes = footnotes or {}
+
+    def output(self, text, rules=None):
+        text = text.rstrip('\n')
+        if not rules:
+            rules = list(self.default_rules)
+
+        if self._in_footnote and 'footnote' in rules:
+            rules.remove('footnote')
+
+        output = self.renderer.placeholder()
+
+        def manipulate(text):
+            for key in rules:
+                pattern = getattr(self.rules, key)
+                m = pattern.match(text)
+                if not m:
+                    continue
+                self.line_match = m
+                out = getattr(self, 'output_%s' % key)(m)
+                if out is not None:
+                    return m, out
+            return False  # pragma: no cover
+
+        while text:
+            ret = manipulate(text)
+            if ret is not False:
+                m, out = ret
+                output += out
+                text = text[len(m.group(0)):]
+                continue
+            if text:  # pragma: no cover
+                raise RuntimeError('Infinite loop at: %s' % text)
+
+        return output
+
+    def output_escape(self, m):
+        text = m.group(1)
+        return self.renderer.escape(text)
+
+    def output_autolink(self, m):
+        link = m.group(1)
+        if m.group(2) == '@':
+            is_email = True
+        else:
+            is_email = False
+        return self.renderer.autolink(link, is_email)
+
+    def output_url(self, m):
+        link = m.group(1)
+        if self._in_link:
+            return self.renderer.text(link)
+        return self.renderer.autolink(link, False)
+
+    def output_inline_html(self, m):
+        tag = m.group(1)
+        if self._parse_inline_html and tag in _inline_tags:
+            text = m.group(3)
+            if tag == 'a':
+                self._in_link = True
+                text = self.output(text, rules=self.inline_html_rules)
+                self._in_link = False
+            else:
+                text = self.output(text, rules=self.inline_html_rules)
+            extra = m.group(2) or ''
+            html = '<%s%s>%s</%s>' % (tag, extra, text, tag)
+        else:
+            html = m.group(0)
+        return self.renderer.inline_html(html)
+
+    def output_footnote(self, m):
+        key = _keyify(m.group(1))
+        if key not in self.footnotes:
+            return None
+        if self.footnotes[key]:
+            return None
+        self.footnote_index += 1
+        self.footnotes[key] = self.footnote_index
+        return self.renderer.footnote_ref(key, self.footnote_index)
+
+    def output_link(self, m):
+        return self._process_link(m, m.group(3), m.group(4))
+
+    def output_reflink(self, m):
+        key = _keyify(m.group(2) or m.group(1))
+        if key not in self.links:
+            return None
+        ret = self.links[key]
+        return self._process_link(m, ret['link'], ret['title'])
+
+    def output_nolink(self, m):
+        key = _keyify(m.group(1))
+        if key not in self.links:
+            return None
+        ret = self.links[key]
+        return self._process_link(m, ret['link'], ret['title'])
+
+    def _process_link(self, m, link, title=None):
+        line = m.group(0)
+        text = m.group(1)
+        if line[0] == '!':
+            return self.renderer.image(link, title, text)
+
+        self._in_link = True
+        text = self.output(text)
+        self._in_link = False
+        return self.renderer.link(link, title, text)
+
+    def output_double_emphasis(self, m):
+        text = m.group(2) or m.group(1)
+        text = self.output(text)
+        return self.renderer.double_emphasis(text)
+
+    def output_emphasis(self, m):
+        text = m.group(2) or m.group(1)
+        text = self.output(text)
+        return self.renderer.emphasis(text)
+
+    def output_code(self, m):
+        text = m.group(2)
+        return self.renderer.codespan(text)
+
+    def output_linebreak(self, m):
+        return self.renderer.linebreak()
+
+    def output_strikethrough(self, m):
+        text = self.output(m.group(1))
+        return self.renderer.strikethrough(text)
+
+    def output_text(self, m):
+        text = m.group(0)
+        return self.renderer.text(text)
+
+
+class Renderer(object):
+    """The default HTML renderer for rendering Markdown.
+    """
+
+    def __init__(self, **kwargs):
+        self.options = kwargs
+
+    def placeholder(self):
+        """Returns the default, empty output value for the renderer.
+
+        All renderer methods use the '+=' operator to append to this value.
+        Default is a string so rendering HTML can build up a result string with
+        the rendered Markdown.
+
+        Can be overridden by Renderer subclasses to be types like an empty
+        list, allowing the renderer to create a tree-like structure to
+        represent the document (which can then be reprocessed later into a
+        separate format like docx or pdf).
+        """
+        return ''
+
+    def block_code(self, code, lang=None):
+        """Rendering block level code. ``pre > code``.
+
+        :param code: text content of the code block.
+        :param lang: language of the given code.
+        """
+        code = code.rstrip('\n')
+        if not lang:
+            code = escape(code, smart_amp=False)
+            return '<pre><code>%s\n</code></pre>\n' % code
+        code = escape(code, quote=True, smart_amp=False)
+        return '<pre><code class="lang-%s">%s\n</code></pre>\n' % (lang, code)
+
+    def block_quote(self, text):
+        """Rendering <blockquote> with the given text.
+
+        :param text: text content of the blockquote.
+        """
+        return '<blockquote>%s\n</blockquote>\n' % text.rstrip('\n')
+
+    def block_html(self, html):
+        """Rendering block level pure html content.
+
+        :param html: text content of the html snippet.
+        """
+        if self.options.get('skip_style') and \
+           html.lower().startswith('<style'):
+            return ''
+        if self.options.get('escape'):
+            return escape(html)
+        return html
+
+    def header(self, text, level, raw=None):
+        """Rendering header/heading tags like ``<h1>`` ``<h2>``.
+
+        :param text: rendered text content for the header.
+        :param level: a number for the header level, for example: 1.
+        :param raw: raw text content of the header.
+        """
+        return '<h%d>%s</h%d>\n' % (level, text, level)
+
+    def hrule(self):
+        """Rendering method for ``<hr>`` tag."""
+        if self.options.get('use_xhtml'):
+            return '<hr />\n'
+        return '<hr>\n'
+
+    def list(self, body, ordered=True):
+        """Rendering list tags like ``<ul>`` and ``<ol>``.
+
+        :param body: body contents of the list.
+        :param ordered: whether this list is ordered or not.
+        """
+        tag = 'ul'
+        if ordered:
+            tag = 'ol'
+        return '<%s>\n%s</%s>\n' % (tag, body, tag)
+
+    def list_item(self, text):
+        """Rendering list item snippet. Like ``<li>``."""
+        return '<li>%s</li>\n' % text
+
+    def paragraph(self, text):
+        """Rendering paragraph tags. Like ``<p>``."""
+        return '<p>%s</p>\n' % text.strip(' ')
+
+    def table(self, header, body):
+        """Rendering table element. Wrap header and body in it.
+
+        :param header: header part of the table.
+        :param body: body part of the table.
+        """
+        return (
+            '<table>\n<thead>%s</thead>\n'
+            '<tbody>\n%s</tbody>\n</table>\n'
+        ) % (header, body)
+
+    def table_row(self, content):
+        """Rendering a table row. Like ``<tr>``.
+
+        :param content: content of current table row.
+        """
+        return '<tr>\n%s</tr>\n' % content
+
+    def table_cell(self, content, **flags):
+        """Rendering a table cell. Like ``<th>`` ``<td>``.
+
+        :param content: content of current table cell.
+        :param header: whether this is header or not.
+        :param align: align of current table cell.
+        """
+        if flags['header']:
+            tag = 'th'
+        else:
+            tag = 'td'
+        align = flags['align']
+        if not align:
+            return '<%s>%s</%s>\n' % (tag, content, tag)
+        return '<%s style="text-align:%s">%s</%s>\n' % (
+            tag, align, content, tag
+        )
+
+    def double_emphasis(self, text):
+        """Rendering **strong** text.
+
+        :param text: text content for emphasis.
+        """
+        return '<strong>%s</strong>' % text
+
+    def emphasis(self, text):
+        """Rendering *emphasis* text.
+
+        :param text: text content for emphasis.
+        """
+        return '<em>%s</em>' % text
+
+    def codespan(self, text):
+        """Rendering inline `code` text.
+
+        :param text: text content for inline code.
+        """
+        text = escape(text.rstrip(), smart_amp=False)
+        return '<code>%s</code>' % text
+
+    def linebreak(self):
+        """Rendering line break like ``<br>``."""
+        if self.options.get('use_xhtml'):
+            return '<br />\n'
+        return '<br>\n'
+
+    def strikethrough(self, text):
+        """Rendering ~~strikethrough~~ text.
+
+        :param text: text content for strikethrough.
+        """
+        return '<del>%s</del>' % text
+
+    def text(self, text):
+        """Rendering unformatted text.
+
+        :param text: text content.
+        """
+        if self.options.get('parse_block_html'):
+            return text
+        return escape(text)
+
+    def escape(self, text):
+        """Rendering escape sequence.
+
+        :param text: text content.
+        """
+        return escape(text)
+
+    def autolink(self, link, is_email=False):
+        """Rendering a given link or email address.
+
+        :param link: link content or email address.
+        :param is_email: whether this is an email or not.
+        """
+        text = link = escape_link(link)
+        if is_email:
+            link = 'mailto:%s' % link
+        return '<a href="%s">%s</a>' % (link, text)
+
+    def link(self, link, title, text):
+        """Rendering a given link with content and title.
+
+        :param link: href link for ``<a>`` tag.
+        :param title: title content for `title` attribute.
+        :param text: text content for description.
+        """
+        link = escape_link(link)
+        if not title:
+            return '<a href="%s">%s</a>' % (link, text)
+        title = escape(title, quote=True)
+        return '<a href="%s" title="%s">%s</a>' % (link, title, text)
+
+    def image(self, src, title, text):
+        """Rendering a image with title and text.
+
+        :param src: source link of the image.
+        :param title: title text of the image.
+        :param text: alt text of the image.
+        """
+        src = escape_link(src)
+        text = escape(text, quote=True)
+        if title:
+            title = escape(title, quote=True)
+            html = '<img src="%s" alt="%s" title="%s"' % (src, text, title)
+        else:
+            html = '<img src="%s" alt="%s"' % (src, text)
+        if self.options.get('use_xhtml'):
+            return '%s />' % html
+        return '%s>' % html
+
+    def inline_html(self, html):
+        """Rendering span level pure html content.
+
+        :param html: text content of the html snippet.
+        """
+        if self.options.get('escape'):
+            return escape(html)
+        return html
+
+    def newline(self):
+        """Rendering newline element."""
+        return ''
+
+    def footnote_ref(self, key, index):
+        """Rendering the ref anchor of a footnote.
+
+        :param key: identity key for the footnote.
+        :param index: the index count of current footnote.
+        """
+        html = (
+            '<sup class="footnote-ref" id="fnref-%s">'
+            '<a href="#fn-%s">%d</a></sup>'
+        ) % (escape(key), escape(key), index)
+        return html
+
+    def footnote_item(self, key, text):
+        """Rendering a footnote item.
+
+        :param key: identity key for the footnote.
+        :param text: text content of the footnote.
+        """
+        back = (
+            '<a href="#fnref-%s" class="footnote">&#8617;</a>'
+        ) % escape(key)
+        text = text.rstrip()
+        if text.endswith('</p>'):
+            text = re.sub(r'<\/p>$', r'%s</p>' % back, text)
+        else:
+            text = '%s<p>%s</p>' % (text, back)
+        html = '<li id="fn-%s">%s</li>\n' % (escape(key), text)
+        return html
+
+    def footnotes(self, text):
+        """Wrapper for all footnotes.
+
+        :param text: contents of all footnotes.
+        """
+        html = '<div class="footnotes">\n%s<ol>%s</ol>\n</div>\n'
+        return html % (self.hrule(), text)
+
+
+class Markdown(object):
+    """The Markdown parser.
+
+    :param renderer: An instance of ``Renderer``.
+    :param inline: An inline lexer class or instance.
+    :param block: A block lexer class or instance.
+    """
+    def __init__(self, renderer=None, inline=None, block=None, **kwargs):
+        if not renderer:
+            renderer = Renderer(**kwargs)
+        else:
+            kwargs.update(renderer.options)
+
+        self.renderer = renderer
+
+        if inline and inspect.isclass(inline):
+            inline = inline(renderer, **kwargs)
+        if block and inspect.isclass(block):
+            block = block(**kwargs)
+
+        if inline:
+            self.inline = inline
+        else:
+            self.inline = InlineLexer(renderer, **kwargs)
+
+        self.block = block or BlockLexer(BlockGrammar())
+        self.footnotes = []
+        self.tokens = []
+
+        # detect if it should parse text in block html
+        self._parse_block_html = kwargs.get('parse_block_html')
+
+    def __call__(self, text):
+        return self.parse(text)
+
+    def render(self, text):
+        """Render the Markdown text.
+
+        :param text: markdown formatted text content.
+        """
+        return self.parse(text)
+
+    def parse(self, text):
+        out = self.output(preprocessing(text))
+
+        keys = self.block.def_footnotes
+
+        # reset block
+        self.block.def_links = {}
+        self.block.def_footnotes = {}
+
+        # reset inline
+        self.inline.links = {}
+        self.inline.footnotes = {}
+
+        if not self.footnotes:
+            return out
+
+        footnotes = filter(lambda o: keys.get(o['key']), self.footnotes)
+        self.footnotes = sorted(
+            footnotes, key=lambda o: keys.get(o['key']), reverse=True
+        )
+
+        body = self.renderer.placeholder()
+        while self.footnotes:
+            note = self.footnotes.pop()
+            body += self.renderer.footnote_item(
+                note['key'], note['text']
+            )
+
+        out += self.renderer.footnotes(body)
+        return out
+
+    def pop(self):
+        if not self.tokens:
+            return None
+        self.token = self.tokens.pop()
+        return self.token
+
+    def peek(self):
+        if self.tokens:
+            return self.tokens[-1]
+        return None  # pragma: no cover
+
+    def output(self, text, rules=None):
+        self.tokens = self.block(text, rules)
+        self.tokens.reverse()
+
+        self.inline.setup(self.block.def_links, self.block.def_footnotes)
+
+        out = self.renderer.placeholder()
+        while self.pop():
+            out += self.tok()
+        return out
+
+    def tok(self):
+        t = self.token['type']
+
+        # sepcial cases
+        if t.endswith('_start'):
+            t = t[:-6]
+
+        return getattr(self, 'output_%s' % t)()
+
+    def tok_text(self):
+        text = self.token['text']
+        while self.peek()['type'] == 'text':
+            text += '\n' + self.pop()['text']
+        return self.inline(text)
+
+    def output_newline(self):
+        return self.renderer.newline()
+
+    def output_hrule(self):
+        return self.renderer.hrule()
+
+    def output_heading(self):
+        return self.renderer.header(
+            self.inline(self.token['text']),
+            self.token['level'],
+            self.token['text'],
+        )
+
+    def output_code(self):
+        return self.renderer.block_code(
+            self.token['text'], self.token['lang']
+        )
+
+    def output_table(self):
+        aligns = self.token['align']
+        aligns_length = len(aligns)
+        cell = self.renderer.placeholder()
+
+        # header part
+        header = self.renderer.placeholder()
+        for i, value in enumerate(self.token['header']):
+            align = aligns[i] if i < aligns_length else None
+            flags = {'header': True, 'align': align}
+            cell += self.renderer.table_cell(self.inline(value), **flags)
+
+        header += self.renderer.table_row(cell)
+
+        # body part
+        body = self.renderer.placeholder()
+        for i, row in enumerate(self.token['cells']):
+            cell = self.renderer.placeholder()
+            for j, value in enumerate(row):
+                align = aligns[j] if j < aligns_length else None
+                flags = {'header': False, 'align': align}
+                cell += self.renderer.table_cell(self.inline(value), **flags)
+            body += self.renderer.table_row(cell)
+
+        return self.renderer.table(header, body)
+
+    def output_block_quote(self):
+        body = self.renderer.placeholder()
+        while self.pop()['type'] != 'block_quote_end':
+            body += self.tok()
+        return self.renderer.block_quote(body)
+
+    def output_list(self):
+        ordered = self.token['ordered']
+        body = self.renderer.placeholder()
+        while self.pop()['type'] != 'list_end':
+            body += self.tok()
+        return self.renderer.list(body, ordered)
+
+    def output_list_item(self):
+        body = self.renderer.placeholder()
+        while self.pop()['type'] != 'list_item_end':
+            if self.token['type'] == 'text':
+                body += self.tok_text()
+            else:
+                body += self.tok()
+
+        return self.renderer.list_item(body)
+
+    def output_loose_item(self):
+        body = self.renderer.placeholder()
+        while self.pop()['type'] != 'list_item_end':
+            body += self.tok()
+        return self.renderer.list_item(body)
+
+    def output_footnote(self):
+        self.inline._in_footnote = True
+        body = self.renderer.placeholder()
+        key = self.token['key']
+        while self.pop()['type'] != 'footnote_end':
+            body += self.tok()
+        self.footnotes.append({'key': key, 'text': body})
+        self.inline._in_footnote = False
+        return self.renderer.placeholder()
+
+    def output_close_html(self):
+        text = self.token['text']
+        return self.renderer.block_html(text)
+
+    def output_open_html(self):
+        text = self.token['text']
+        tag = self.token['tag']
+        if self._parse_block_html and tag not in _pre_tags:
+            text = self.inline(text, rules=self.inline.inline_html_rules)
+        extra = self.token.get('extra') or ''
+        html = '<%s%s>%s</%s>' % (tag, extra, text, tag)
+        return self.renderer.block_html(html)
+
+    def output_paragraph(self):
+        return self.renderer.paragraph(self.inline(self.token['text']))
+
+    def output_text(self):
+        return self.renderer.paragraph(self.tok_text())
+
+
+def markdown(text, escape=True, **kwargs):
+    """Render markdown formatted text to html.
+
+    :param text: markdown formatted text content.
+    :param escape: if set to False, all html tags will not be escaped.
+    :param use_xhtml: output with xhtml tags.
+    :param hard_wrap: if set to True, it will use the GFM line breaks feature.
+    :param parse_block_html: parse text only in block level html.
+    :param parse_inline_html: parse text only in inline level html.
+    """
+    return Markdown(escape=escape, **kwargs)(text)