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from typing import Dict, Any
from textwrap import indent
from ._list import render_list
from ..core import BaseRenderer, BlockState
from ..util import strip_end
class RSTRenderer(BaseRenderer):
"""A renderer for converting Markdown to ReST."""
NAME = 'rst'
#: marker symbols for heading
HEADING_MARKERS = {
1: '=',
2: '-',
3: '~',
4: '^',
5: '"',
6: "'",
}
INLINE_IMAGE_PREFIX = 'img-'
def iter_tokens(self, tokens, state):
prev = None
for tok in tokens:
# ignore blank line
if tok['type'] == 'blank_line':
continue
tok['prev'] = prev
prev = tok
yield self.render_token(tok, state)
def __call__(self, tokens, state: BlockState):
state.env['inline_images'] = []
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):
images = state.env['inline_images']
for index, token in enumerate(images):
attrs = token['attrs']
alt = self.render_children(token, state)
ident = self.INLINE_IMAGE_PREFIX + str(index)
yield '.. |' + ident + '| image:: ' + attrs['url'] + '\n :alt: ' + alt
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:
text = token['raw']
return text.replace('|', r'\|')
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:
attrs = token['attrs']
text = self.render_children(token, state)
return '`' + text + ' <' + attrs['url'] + '>`__'
def image(self, token: Dict[str, Any], state: BlockState) -> str:
refs: list = state.env['inline_images']
index = len(refs)
refs.append(token)
return '|' + self.INLINE_IMAGE_PREFIX + str(index) + '|'
def codespan(self, token: Dict[str, Any], state: BlockState) -> str:
return '``' + token['raw'] + '``'
def linebreak(self, token: Dict[str, Any], state: BlockState) -> str:
return '<linebreak>'
def softbreak(self, token: Dict[str, Any], state: BlockState) -> str:
return ' '
def inline_html(self, token: Dict[str, Any], state: BlockState) -> str:
# rst does not support inline html
return ''
def paragraph(self, token: Dict[str, Any], state: BlockState) -> str:
children = token['children']
if len(children) == 1 and children[0]['type'] == 'image':
image = children[0]
attrs = image['attrs']
title = attrs.get('title')
alt = self.render_children(image, state)
text = '.. figure:: ' + attrs['url']
if title:
text += '\n :alt: ' + title
text += '\n\n' + indent(alt, ' ')
else:
text = self.render_tokens(children, state)
lines = text.split('<linebreak>')
if len(lines) > 1:
text = '\n'.join('| ' + line for line in lines)
return text + '\n\n'
def heading(self, token: Dict[str, Any], state: BlockState) -> str:
attrs = token['attrs']
text = self.render_children(token, state)
marker = self.HEADING_MARKERS[attrs['level']]
return text + '\n' + marker * len(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 = indent(token['raw'], ' ')
if info:
lang = info.split()[0]
return '.. code:: ' + lang + '\n\n' + code + '\n'
else:
return '::\n\n' + code + '\n\n'
def block_quote(self, token: Dict[str, Any], state: BlockState) -> str:
text = indent(self.render_children(token, state), ' ')
prev = token['prev']
ignore_blocks = (
'paragraph',
'thematic_break',
'linebreak',
'heading',
)
if prev and prev['type'] not in ignore_blocks:
text = '..\n\n' + text
return text
def block_html(self, token: Dict[str, Any], state: BlockState) -> str:
raw = token['raw']
return '.. raw:: html\n\n' + indent(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)
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