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160 lines
3.8 KiB
160 lines
3.8 KiB
from __future__ import unicode_literals
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from commonmark.render.renderer import Renderer
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class ReStructuredTextRenderer(Renderer):
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"""
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Render reStructuredText from Markdown
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Example:
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.. code:: python
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import commonmark
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parser = commonmark.Parser()
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ast = parser.parse('Hello `inline code` example')
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renderer = commonmark.ReStructuredTextRenderer()
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rst = renderer.render(ast)
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print(rst) # Hello ``inline code`` example
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"""
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def __init__(self, indent_char=' '):
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self.indent_char = indent_char
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self.indent_length = 0
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def lit(self, s):
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if s == '\n':
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indent = '' # Avoid whitespace if we're just adding a newline
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elif self.last_out != '\n':
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indent = '' # Don't indent if we're in the middle of a line
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else:
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indent = self.indent_char * self.indent_length
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return super(ReStructuredTextRenderer, self).lit(indent + s)
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def cr(self):
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self.lit('\n')
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def indent_lines(self, literal, indent_length=4):
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indent = self.indent_char * indent_length
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new_lines = []
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for line in literal.splitlines():
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new_lines.append(indent + line)
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return '\n'.join(new_lines)
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# Nodes
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def document(self, node, entering):
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pass
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def softbreak(self, node, entering):
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self.cr()
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def linebreak(self, node, entering):
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self.cr()
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self.cr()
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def text(self, node, entering):
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self.out(node.literal)
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def emph(self, node, entering):
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self.out('*')
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def strong(self, node, entering):
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self.out('**')
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def paragraph(self, node, entering):
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if node.parent.t == 'item':
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pass
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else:
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self.cr()
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def link(self, node, entering):
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if entering:
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self.out('`')
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else:
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self.out(' <%s>`_' % node.destination)
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def image(self, node, entering):
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directive = '.. image:: ' + node.destination
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if entering:
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self.out(directive)
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self.cr()
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self.indent_length += 4
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self.out(':alt: ')
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else:
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self.indent_length -= 4
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def code(self, node, entering):
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self.out('``')
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self.out(node.literal)
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self.out('``')
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def code_block(self, node, entering):
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directive = '.. code::'
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language_name = None
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info_words = node.info.split() if node.info else []
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if len(info_words) > 0 and len(info_words[0]) > 0:
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language_name = info_words[0]
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if language_name:
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directive += ' ' + language_name
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self.cr()
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self.out(directive)
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self.cr()
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self.cr()
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self.out(self.indent_lines(node.literal))
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self.cr()
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def list(self, node, entering):
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if entering:
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self.cr()
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def item(self, node, entering):
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tagname = '*' if node.list_data['type'] == 'bullet' else '#.'
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if entering:
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self.out(tagname + ' ')
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else:
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self.cr()
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def block_quote(self, node, entering):
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if entering:
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self.indent_length += 4
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else:
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self.indent_length -= 4
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def heading(self, node, entering):
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heading_chars = [
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'#',
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'*',
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'=',
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'-',
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'^',
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'"'
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]
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try:
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heading_char = heading_chars[node.level-1]
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except IndexError:
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# Default to the last level if we're in too deep
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heading_char = heading_chars[-1]
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heading_length = len(node.first_child.literal)
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banner = heading_char * heading_length
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if entering:
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self.cr()
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else:
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self.cr()
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self.out(banner)
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self.cr()
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