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import re
from typing import Dict, Any
from textwrap import indent
from ._list import render_list
from ..core import BaseRenderer, BlockState
from ..util import strip_end
fenced_re = re.compile(r'^(?:`|~)+', re.M)
class MarkdownRenderer(BaseRenderer):
"""A renderer to re-format Markdown text."""
NAME = 'markdown'
def __call__(self, tokens, state: BlockState):
out = self.render_tokens(tokens, state)
# special handle for line breaks
out += '\n\n'.join(self.render_referrences(state)) + '\n'
return strip_end(out)
def render_referrences(self, state: BlockState):
ref_links = state.env['ref_links']
for key in ref_links:
attrs = ref_links[key]
text = '[' + attrs['label'] + ']: ' + attrs['url']
title = attrs.get('title')
if title:
text += ' "' + title + '"'
yield text
def render_children(self, token, state: BlockState):
children = token['children']
return self.render_tokens(children, state)
def text(self, token: Dict[str, Any], state: BlockState) -> str:
return token['raw']
def emphasis(self, token: Dict[str, Any], state: BlockState) -> str:
return '*' + self.render_children(token, state) + '*'
def strong(self, token: Dict[str, Any], state: BlockState) -> str:
return '**' + self.render_children(token, state) + '**'
def link(self, token: Dict[str, Any], state: BlockState) -> str:
label = token.get('label')
text = self.render_children(token, state)
out = '[' + text + ']'
if label:
return out + '[' + label + ']'
attrs = token['attrs']
url = attrs['url']
title = attrs.get('title')
if text == url and not title:
return '<' + text + '>'
elif 'mailto:' + text == url and not title:
return '<' + text + '>'
out += '('
if '(' in url or ')' in url:
out += '<' + url + '>'
else:
out += url
if title:
out += ' "' + title + '"'
return out + ')'
def image(self, token: Dict[str, Any], state: BlockState) -> str:
return '!' + self.link(token, state)
def codespan(self, token: Dict[str, Any], state: BlockState) -> str:
return '`' + token['raw'] + '`'
def linebreak(self, token: Dict[str, Any], state: BlockState) -> str:
return ' \n'
def softbreak(self, token: Dict[str, Any], state: BlockState) -> str:
return '\n'
def blank_line(self, token: Dict[str, Any], state: BlockState) -> str:
return ''
def inline_html(self, token: Dict[str, Any], state: BlockState) -> str:
return token['raw']
def paragraph(self, token: Dict[str, Any], state: BlockState) -> str:
text = self.render_children(token, state)
return text + '\n\n'
def heading(self, token: Dict[str, Any], state: BlockState) -> str:
level = token['attrs']['level']
marker = '#' * level
text = self.render_children(token, state)
return marker + ' ' + text + '\n\n'
def thematic_break(self, token: Dict[str, Any], state: BlockState) -> str:
return '***\n\n'
def block_text(self, token: Dict[str, Any], state: BlockState) -> str:
return self.render_children(token, state) + '\n'
def block_code(self, token: Dict[str, Any], state: BlockState) -> str:
attrs = token.get('attrs', {})
info = attrs.get('info', '')
code = token['raw']
if code and code[-1] != '\n':
code += '\n'
marker = token.get('marker')
if not marker:
marker = _get_fenced_marker(code)
return marker + info + '\n' + code + marker + '\n\n'
def block_quote(self, token: Dict[str, Any], state: BlockState) -> str:
text = indent(self.render_children(token, state), '> ')
return text + '\n\n'
def block_html(self, token: Dict[str, Any], state: BlockState) -> str:
return token['raw'] + '\n\n'
def block_error(self, token: Dict[str, Any], state: BlockState) -> str:
return ''
def list(self, token: Dict[str, Any], state: BlockState) -> str:
return render_list(self, token, state)
def _get_fenced_marker(code):
found = fenced_re.findall(code)
if not found:
return '```'
ticks = [] # `
waves = [] # ~
for s in found:
if s[0] == '`':
ticks.append(len(s))
else:
waves.append(len(s))
if not ticks:
return '```'
if not waves:
return '~~~'
return '`' * (max(ticks) + 1)
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