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# frozen_string_literal: true
# `CommonMark` markdown engine for GitLab's Banzai markdown filter.
# This module is used in Banzai::Filter::MarkdownFilter.
# Used gem is `commonmarker` which is a ruby wrapper for libcmark (CommonMark parser)
# including GitHub's GFM extensions.
# We now utilize the renderer built in `C`, rather than the ruby based renderer.
# Homepage: https://github.com/gjtorikian/commonmarker
module Banzai
module Filter
module MarkdownEngines
class CommonMark
EXTENSIONS = [
:autolink, # provides support for automatically converting URLs to anchor tags.
:strikethrough, # provides support for strikethroughs.
:table # provides support for tables.
].freeze
PARSE_OPTIONS = [
:FOOTNOTES, # parse footnotes.
:STRIKETHROUGH_DOUBLE_TILDE, # parse strikethroughs by double tildes (as redcarpet does).
:VALIDATE_UTF8 # replace illegal sequences with the replacement character U+FFFD.
].freeze
RENDER_OPTIONS = [
:GITHUB_PRE_LANG, # use GitHub-style <pre lang> for fenced code blocks.
:FOOTNOTES, # render footnotes.
:FULL_INFO_STRING, # include full info strings of code blocks in separate attribute.
:UNSAFE # allow raw/custom HTML and unsafe links.
].freeze
def initialize(context)
@context = context
end
def render(text)
CommonMarker.render_html(text, render_options, EXTENSIONS)
end
private
def render_options
@context[:no_sourcepos] ? render_options_no_sourcepos : render_options_sourcepos
end
def render_options_no_sourcepos
RENDER_OPTIONS
end
def render_options_sourcepos
render_options_no_sourcepos + [
:SOURCEPOS # enable embedding of source position information
].freeze
end
end
end
end
end
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