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229 lines
6.4 KiB
229 lines
6.4 KiB
4 years ago
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from __future__ import unicode_literals
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import re
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from builtins import str
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from commonmark.common import escape_xml
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from commonmark.render.renderer import Renderer
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reUnsafeProtocol = re.compile(
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r'^javascript:|vbscript:|file:|data:', re.IGNORECASE)
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reSafeDataProtocol = re.compile(
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r'^data:image\/(?:png|gif|jpeg|webp)', re.IGNORECASE)
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def potentially_unsafe(url):
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return re.search(reUnsafeProtocol, url) and \
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(not re.search(reSafeDataProtocol, url))
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class HtmlRenderer(Renderer):
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def __init__(self, options={}):
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# by default, soft breaks are rendered as newlines in HTML
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options['softbreak'] = options.get('softbreak') or '\n'
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# set to "<br />" to make them hard breaks
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# set to " " if you want to ignore line wrapping in source
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self.disable_tags = 0
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self.last_out = '\n'
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self.options = options
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def escape(self, text):
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return escape_xml(text)
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def tag(self, name, attrs=None, selfclosing=None):
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"""Helper function to produce an HTML tag."""
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if self.disable_tags > 0:
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return
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self.buf += '<' + name
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if attrs and len(attrs) > 0:
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for attrib in attrs:
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self.buf += ' ' + attrib[0] + '="' + attrib[1] + '"'
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if selfclosing:
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self.buf += ' /'
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self.buf += '>'
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self.last_out = '>'
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# Node methods #
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def text(self, node, entering=None):
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self.out(node.literal)
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def softbreak(self, node=None, entering=None):
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self.lit(self.options['softbreak'])
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def linebreak(self, node=None, entering=None):
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self.tag('br', [], True)
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self.cr()
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def link(self, node, entering):
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attrs = self.attrs(node)
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if entering:
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if not (self.options.get('safe') and
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potentially_unsafe(node.destination)):
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attrs.append(['href', self.escape(node.destination)])
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if node.title:
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attrs.append(['title', self.escape(node.title)])
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self.tag('a', attrs)
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else:
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self.tag('/a')
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def image(self, node, entering):
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if entering:
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if self.disable_tags == 0:
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if self.options.get('safe') and \
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potentially_unsafe(node.destination):
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self.lit('<img src="" alt="')
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else:
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self.lit('<img src="' +
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self.escape(node.destination) +
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'" alt="')
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self.disable_tags += 1
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else:
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self.disable_tags -= 1
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if self.disable_tags == 0:
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if node.title:
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self.lit('" title="' + self.escape(node.title))
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self.lit('" />')
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def emph(self, node, entering):
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self.tag('em' if entering else '/em')
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def strong(self, node, entering):
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self.tag('strong' if entering else '/strong')
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def paragraph(self, node, entering):
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grandparent = node.parent.parent
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attrs = self.attrs(node)
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if grandparent is not None and grandparent.t == 'list':
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if grandparent.list_data['tight']:
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return
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if entering:
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self.cr()
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self.tag('p', attrs)
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else:
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self.tag('/p')
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self.cr()
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def heading(self, node, entering):
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tagname = 'h' + str(node.level)
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attrs = self.attrs(node)
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if entering:
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self.cr()
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self.tag(tagname, attrs)
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else:
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self.tag('/' + tagname)
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self.cr()
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def code(self, node, entering):
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self.tag('code')
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self.out(node.literal)
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self.tag('/code')
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def code_block(self, node, entering):
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info_words = node.info.split() if node.info else []
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attrs = self.attrs(node)
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if len(info_words) > 0 and len(info_words[0]) > 0:
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attrs.append(['class', 'language-' +
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self.escape(info_words[0])])
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self.cr()
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self.tag('pre')
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self.tag('code', attrs)
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self.out(node.literal)
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self.tag('/code')
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self.tag('/pre')
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self.cr()
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def thematic_break(self, node, entering):
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attrs = self.attrs(node)
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self.cr()
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self.tag('hr', attrs, True)
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self.cr()
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def block_quote(self, node, entering):
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attrs = self.attrs(node)
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if entering:
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self.cr()
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self.tag('blockquote', attrs)
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self.cr()
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else:
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self.cr()
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self.tag('/blockquote')
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self.cr()
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def list(self, node, entering):
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tagname = 'ul' if node.list_data['type'] == 'bullet' else 'ol'
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attrs = self.attrs(node)
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if entering:
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start = node.list_data['start']
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if start is not None and start != 1:
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attrs.append(['start', str(start)])
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self.cr()
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self.tag(tagname, attrs)
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self.cr()
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else:
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self.cr()
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self.tag('/' + tagname)
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self.cr()
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def item(self, node, entering):
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attrs = self.attrs(node)
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if entering:
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self.tag('li', attrs)
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else:
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self.tag('/li')
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self.cr()
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def html_inline(self, node, entering):
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if self.options.get('safe'):
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self.lit('<!-- raw HTML omitted -->')
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else:
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self.lit(node.literal)
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def html_block(self, node, entering):
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self.cr()
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if self.options.get('safe'):
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self.lit('<!-- raw HTML omitted -->')
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else:
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self.lit(node.literal)
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self.cr()
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def custom_inline(self, node, entering):
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if entering and node.on_enter:
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self.lit(node.on_enter)
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elif (not entering) and node.on_exit:
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self.lit(node.on_exit)
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def custom_block(self, node, entering):
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self.cr()
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if entering and node.on_enter:
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self.lit(node.on_enter)
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elif (not entering) and node.on_exit:
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self.lit(node.on_exit)
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self.cr()
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# Helper methods #
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def out(self, s):
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self.lit(self.escape(s))
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def attrs(self, node):
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att = []
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if self.options.get('sourcepos'):
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pos = node.sourcepos
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if pos:
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att.append(['data-sourcepos', str(pos[0][0]) + ':' +
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str(pos[0][1]) + '-' + str(pos[1][0]) + ':' +
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str(pos[1][1])])
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return att
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