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module Banzai
module Filter
class MarkdownFilter < HTML::Pipeline::TextFilter
def initialize(text, context = nil, result = nil)
super(text, context, result)
@renderer = renderer(context[:markdown_engine]).new
@text = @text.delete("\r")
end
def call
@renderer.render(@text).rstrip
end
private
DEFAULT_ENGINE = :common_mark
def engine(engine_from_context)
engine_from_context ||= DEFAULT_ENGINE
engine_from_context.to_s.classify
end
def renderer(engine_from_context)
"Banzai::Filter::MarkdownEngines::#{engine(engine_from_context)}".constantize
rescue NameError
raise NameError, "`#{engine_from_context}` is unknown markdown engine"
end
end
end
end
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