1185 lines
36 KiB
Python
1185 lines
36 KiB
Python
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# coding: utf-8
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"""
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mistune
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~~~~~~~
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The fastest markdown parser in pure Python with renderer feature.
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:copyright: (c) 2014 - 2018 by Hsiaoming Yang.
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"""
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import re
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import inspect
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__version__ = '0.8.4'
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__author__ = 'Hsiaoming Yang <me@lepture.com>'
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__all__ = [
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'BlockGrammar', 'BlockLexer',
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'InlineGrammar', 'InlineLexer',
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'Renderer', 'Markdown',
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'markdown', 'escape',
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]
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_key_pattern = re.compile(r'\s+')
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_nonalpha_pattern = re.compile(r'\W')
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_escape_pattern = re.compile(r'&(?!#?\w+;)')
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_newline_pattern = re.compile(r'\r\n|\r')
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_block_quote_leading_pattern = re.compile(r'^ *> ?', flags=re.M)
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_block_code_leading_pattern = re.compile(r'^ {4}', re.M)
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_inline_tags = [
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'a', 'em', 'strong', 'small', 's', 'cite', 'q', 'dfn', 'abbr', 'data',
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'time', 'code', 'var', 'samp', 'kbd', 'sub', 'sup', 'i', 'b', 'u', 'mark',
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'ruby', 'rt', 'rp', 'bdi', 'bdo', 'span', 'br', 'wbr', 'ins', 'del',
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'img', 'font',
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]
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_pre_tags = ['pre', 'script', 'style']
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_valid_end = r'(?!:/|[^\w\s@]*@)\b'
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_valid_attr = r'''\s*[a-zA-Z\-](?:\s*\=\s*(?:"[^"]*"|'[^']*'|[^\s'">]+))?'''
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_block_tag = r'(?!(?:%s)\b)\w+%s' % ('|'.join(_inline_tags), _valid_end)
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_scheme_blacklist = ('javascript:', 'vbscript:')
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def _pure_pattern(regex):
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pattern = regex.pattern
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if pattern.startswith('^'):
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pattern = pattern[1:]
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return pattern
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def _keyify(key):
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key = escape(key.lower(), quote=True)
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return _key_pattern.sub(' ', key)
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def escape(text, quote=False, smart_amp=True):
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"""Replace special characters "&", "<" and ">" to HTML-safe sequences.
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The original cgi.escape will always escape "&", but you can control
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this one for a smart escape amp.
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:param quote: if set to True, " and ' will be escaped.
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:param smart_amp: if set to False, & will always be escaped.
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"""
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if smart_amp:
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text = _escape_pattern.sub('&', text)
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else:
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text = text.replace('&', '&')
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text = text.replace('<', '<')
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text = text.replace('>', '>')
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if quote:
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text = text.replace('"', '"')
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text = text.replace("'", ''')
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return text
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def escape_link(url):
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"""Remove dangerous URL schemes like javascript: and escape afterwards."""
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lower_url = url.lower().strip('\x00\x1a \n\r\t')
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for scheme in _scheme_blacklist:
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if re.sub(r'[^A-Za-z0-9\/:]+', '', lower_url).startswith(scheme):
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return ''
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return escape(url, quote=True, smart_amp=False)
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def preprocessing(text, tab=4):
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text = _newline_pattern.sub('\n', text)
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text = text.expandtabs(tab)
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text = text.replace('\u2424', '\n')
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pattern = re.compile(r'^ +$', re.M)
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return pattern.sub('', text)
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class BlockGrammar(object):
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"""Grammars for block level tokens."""
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def_links = re.compile(
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r'^ *\[([^^\]]+)\]: *' # [key]:
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r'<?([^\s>]+)>?' # <link> or link
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r'(?: +["(]([^\n]+)[")])? *(?:\n+|$)'
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)
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def_footnotes = re.compile(
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r'^\[\^([^\]]+)\]: *('
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r'[^\n]*(?:\n+|$)' # [^key]:
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r'(?: {1,}[^\n]*(?:\n+|$))*'
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r')'
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)
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newline = re.compile(r'^\n+')
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block_code = re.compile(r'^( {4}[^\n]+\n*)+')
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fences = re.compile(
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r'^ *(`{3,}|~{3,}) *([^`\s]+)? *\n' # ```lang
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r'([\s\S]+?)\s*'
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r'\1 *(?:\n+|$)' # ```
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)
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hrule = re.compile(r'^ {0,3}[-*_](?: *[-*_]){2,} *(?:\n+|$)')
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heading = re.compile(r'^ *(#{1,6}) *([^\n]+?) *#* *(?:\n+|$)')
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lheading = re.compile(r'^([^\n]+)\n *(=|-)+ *(?:\n+|$)')
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block_quote = re.compile(r'^( *>[^\n]+(\n[^\n]+)*\n*)+')
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list_block = re.compile(
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r'^( *)(?=[*+-]|\d+\.)(([*+-])?(?:\d+\.)?) [\s\S]+?'
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r'(?:'
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r'\n+(?=\1?(?:[-*_] *){3,}(?:\n+|$))' # hrule
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r'|\n+(?=%s)' # def links
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r'|\n+(?=%s)' # def footnotes\
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r'|\n+(?=\1(?(3)\d+\.|[*+-]) )' # heterogeneous bullet
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r'|\n{2,}'
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r'(?! )'
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r'(?!\1(?:[*+-]|\d+\.) )\n*'
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r'|'
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r'\s*$)' % (
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_pure_pattern(def_links),
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_pure_pattern(def_footnotes),
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)
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)
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list_item = re.compile(
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r'^(( *)(?:[*+-]|\d+\.) [^\n]*'
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r'(?:\n(?!\2(?:[*+-]|\d+\.) )[^\n]*)*)',
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flags=re.M
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)
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list_bullet = re.compile(r'^ *(?:[*+-]|\d+\.) +')
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paragraph = re.compile(
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r'^((?:[^\n]+\n?(?!'
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r'%s|%s|%s|%s|%s|%s|%s|%s|%s'
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r'))+)\n*' % (
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_pure_pattern(fences).replace(r'\1', r'\2'),
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_pure_pattern(list_block).replace(r'\1', r'\3'),
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_pure_pattern(hrule),
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_pure_pattern(heading),
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_pure_pattern(lheading),
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_pure_pattern(block_quote),
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_pure_pattern(def_links),
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_pure_pattern(def_footnotes),
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'<' + _block_tag,
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)
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)
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block_html = re.compile(
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r'^ *(?:%s|%s|%s) *(?:\n{2,}|\s*$)' % (
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r'<!--[\s\S]*?-->',
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r'<(%s)((?:%s)*?)>([\s\S]*?)<\/\1>' % (_block_tag, _valid_attr),
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r'<%s(?:%s)*?\s*\/?>' % (_block_tag, _valid_attr),
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)
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)
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table = re.compile(
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r'^ *\|(.+)\n *\|( *[-:]+[-| :]*)\n((?: *\|.*(?:\n|$))*)\n*'
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)
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nptable = re.compile(
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r'^ *(\S.*\|.*)\n *([-:]+ *\|[-| :]*)\n((?:.*\|.*(?:\n|$))*)\n*'
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)
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text = re.compile(r'^[^\n]+')
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class BlockLexer(object):
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"""Block level lexer for block grammars."""
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grammar_class = BlockGrammar
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default_rules = [
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'newline', 'hrule', 'block_code', 'fences', 'heading',
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'nptable', 'lheading', 'block_quote',
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'list_block', 'block_html', 'def_links',
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'def_footnotes', 'table', 'paragraph', 'text'
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]
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list_rules = (
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'newline', 'block_code', 'fences', 'lheading', 'hrule',
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'block_quote', 'list_block', 'block_html', 'text',
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)
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footnote_rules = (
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'newline', 'block_code', 'fences', 'heading',
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'nptable', 'lheading', 'hrule', 'block_quote',
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'list_block', 'block_html', 'table', 'paragraph', 'text'
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)
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def __init__(self, rules=None, **kwargs):
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self.tokens = []
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self.def_links = {}
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self.def_footnotes = {}
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if not rules:
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rules = self.grammar_class()
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self.rules = rules
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self._max_recursive_depth = kwargs.get('max_recursive_depth', 6)
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self._list_depth = 0
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self._blockquote_depth = 0
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def __call__(self, text, rules=None):
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return self.parse(text, rules)
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def parse(self, text, rules=None):
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text = text.rstrip('\n')
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if not rules:
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rules = self.default_rules
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def manipulate(text):
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for key in rules:
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rule = getattr(self.rules, key)
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m = rule.match(text)
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if not m:
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continue
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getattr(self, 'parse_%s' % key)(m)
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return m
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return False # pragma: no cover
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while text:
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m = manipulate(text)
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if m is not False:
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text = text[len(m.group(0)):]
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continue
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if text: # pragma: no cover
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raise RuntimeError('Infinite loop at: %s' % text)
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return self.tokens
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def parse_newline(self, m):
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length = len(m.group(0))
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if length > 1:
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self.tokens.append({'type': 'newline'})
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def parse_block_code(self, m):
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# clean leading whitespace
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code = _block_code_leading_pattern.sub('', m.group(0))
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self.tokens.append({
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'type': 'code',
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'lang': None,
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'text': code,
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})
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def parse_fences(self, m):
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self.tokens.append({
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'type': 'code',
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'lang': m.group(2),
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'text': m.group(3),
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})
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def parse_heading(self, m):
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self.tokens.append({
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'type': 'heading',
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'level': len(m.group(1)),
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'text': m.group(2),
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})
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def parse_lheading(self, m):
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"""Parse setext heading."""
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self.tokens.append({
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'type': 'heading',
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'level': 1 if m.group(2) == '=' else 2,
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'text': m.group(1),
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})
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def parse_hrule(self, m):
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self.tokens.append({'type': 'hrule'})
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def parse_list_block(self, m):
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bull = m.group(2)
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self.tokens.append({
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'type': 'list_start',
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'ordered': '.' in bull,
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})
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self._list_depth += 1
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if self._list_depth > self._max_recursive_depth:
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self.tokens.append({'type': 'list_item_start'})
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self.parse_text(m)
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self.tokens.append({'type': 'list_item_end'})
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else:
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cap = m.group(0)
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self._process_list_item(cap, bull)
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self.tokens.append({'type': 'list_end'})
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self._list_depth -= 1
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def _process_list_item(self, cap, bull):
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cap = self.rules.list_item.findall(cap)
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_next = False
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length = len(cap)
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for i in range(length):
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item = cap[i][0]
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# remove the bullet
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space = len(item)
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item = self.rules.list_bullet.sub('', item)
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# outdent
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if '\n ' in item:
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space = space - len(item)
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pattern = re.compile(r'^ {1,%d}' % space, flags=re.M)
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item = pattern.sub('', item)
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# determine whether item is loose or not
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loose = _next
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if not loose and re.search(r'\n\n(?!\s*$)', item):
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loose = True
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rest = len(item)
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if i != length - 1 and rest:
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_next = item[rest-1] == '\n'
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if not loose:
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loose = _next
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if loose:
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t = 'loose_item_start'
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else:
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t = 'list_item_start'
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self.tokens.append({'type': t})
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# recurse
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self.parse(item, self.list_rules)
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self.tokens.append({'type': 'list_item_end'})
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def parse_block_quote(self, m):
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self.tokens.append({'type': 'block_quote_start'})
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self._blockquote_depth += 1
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if self._blockquote_depth > self._max_recursive_depth:
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self.parse_text(m)
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else:
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# clean leading >
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cap = _block_quote_leading_pattern.sub('', m.group(0))
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self.parse(cap)
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self.tokens.append({'type': 'block_quote_end'})
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self._blockquote_depth -= 1
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def parse_def_links(self, m):
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key = _keyify(m.group(1))
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self.def_links[key] = {
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'link': m.group(2),
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'title': m.group(3),
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}
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def parse_def_footnotes(self, m):
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key = _keyify(m.group(1))
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if key in self.def_footnotes:
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# footnote is already defined
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return
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self.def_footnotes[key] = 0
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self.tokens.append({
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'type': 'footnote_start',
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|
|
'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">↩</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)
|