File: mermaid_filter.rb

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# frozen_string_literal: true

# Generated HTML is transformed back to GFM by app/assets/javascripts/behaviors/markdown/nodes/code_block.js
module Banzai
  module Filter
    class MermaidFilter < HTML::Pipeline::Filter
      prepend Concerns::PipelineTimingCheck

      CSS   = 'pre[data-canonical-lang="mermaid"] > code'
      XPATH = Gitlab::Utils::Nokogiri.css_to_xpath(CSS).freeze

      def call
        doc.xpath(XPATH).add_class('js-render-mermaid')

        doc
      end
    end
  end
end