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# frozen_string_literal: true
HTML::Pipeline.require_dependency('commonmarker', 'MarkdownFilter')
module HTML
class Pipeline
# HTML Filter that converts Markdown text into HTML and converts into a
# DocumentFragment. This is different from most filters in that it can take a
# non-HTML as input. It must be used as the first filter in a pipeline.
#
# Context options:
# :gfm => false Disable GFM line-end processing
# :commonmarker_extensions => [ :table, :strikethrough,
# :tagfilter, :autolink ] Commonmarker extensions to include
#
# This filter does not write any additional information to the context hash.
class MarkdownFilter < TextFilter
DEFAULT_COMMONMARKER_EXTENSIONS = %i[table strikethrough tagfilter autolink].freeze
def initialize(text, context = nil, result = nil)
super text, context, result
@text = @text.delete "\r"
end
# Convert Markdown to HTML using the best available implementation
# and convert into a DocumentFragment.
def call
extensions = context.fetch(
:commonmarker_extensions,
DEFAULT_COMMONMARKER_EXTENSIONS
)
html = if (renderer = context[:commonmarker_renderer])
unless renderer < CommonMarker::HtmlRenderer
raise ArgumentError, "`commonmark_renderer` must be derived from `CommonMarker::HtmlRenderer`"
end
parse_options = :DEFAULT
parse_options = [:UNSAFE] if context[:unsafe]
render_options = [:GITHUB_PRE_LANG]
render_options << :HARDBREAKS if context[:gfm] != false
render_options << :UNSAFE if context[:unsafe]
doc = CommonMarker.render_doc(@text, parse_options, extensions)
renderer.new(options: render_options, extensions: extensions).render(doc)
else
options = [:GITHUB_PRE_LANG]
options << :HARDBREAKS if context[:gfm] != false
options << :UNSAFE if context[:unsafe]
CommonMarker.render_html(@text, options, extensions)
end
html.rstrip!
html
end
end
end
end
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