44 lines
1.2 KiB
Ruby
44 lines
1.2 KiB
Ruby
# frozen_string_literal: true
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require "nokogiri"
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require "asciidoctor_plantuml/plantuml"
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module Banzai
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module Filter
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# HTML that replaces all `lang plantuml` tags with PlantUML img tags.
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#
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class PlantumlFilter < HTML::Pipeline::Filter
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def call
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return doc unless settings.plantuml_enabled? && doc.at_xpath(lang_tag)
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Gitlab::Plantuml.configure
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doc.xpath(lang_tag).each do |node|
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img_tag = Nokogiri::HTML::DocumentFragment.parse(
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Asciidoctor::PlantUml::Processor.plantuml_content(node.content, {})).css('img').first
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next if img_tag.nil?
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img_tag.set_attribute('data-diagram', 'plantuml')
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img_tag.set_attribute('data-diagram-src', "data:text/plain;base64,#{Base64.strict_encode64(node.content)}")
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node.parent.replace(img_tag)
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end
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doc
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end
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private
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def lang_tag
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@lang_tag ||= Gitlab::Utils::Nokogiri
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.css_to_xpath('pre[data-canonical-lang="plantuml"] > code, pre > code[data-canonical-lang="plantuml"]').freeze
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end
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def settings
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Gitlab::CurrentSettings.current_application_settings
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end
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end
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end
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end
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