Kentico/delivery-sdk-ruby

require 'nokogiri'

module Kontent
  module Ai
    module Delivery
      module Resolvers
        # Locates <object data-type="item"> tags in content and calls a user-defined
        # method to supply the output for the content item.
        # See https://github.com/kontent-ai/delivery-sdk-ruby#resolving-inline-content
        class InlineContentItemResolver
          def initialize(callback = nil)
            @callback = callback
          end

          # Resolves all inline content items in the content.
          #
          # * *Args*:
          #   - *content* (+string+) The string value stored in the element
          #   - *inline_items* (+Array+) ContentItems referenced by the content from the 'modular_content' JSON node
          #
          # * *Returns*:
          #   - +string+ The original content passed, with all <object data-type="item"> replaced with custom output
          def resolve(content, inline_items)
            doc = Nokogiri::HTML.parse(content).xpath('//body')
            tags = doc.xpath('//object[@type="application/kenticocloud"][@data-type="item"]')
            tags.each do |tag|
              output = resolve_tag tag, inline_items
              el = doc.at_xpath(
                '//object[@type="application/kenticocloud"][@data-type="item"][@data-codename=$value]',
                nil,
                value: tag['data-codename']
              )
              el.swap(output) unless output.nil?
            end
            doc.inner_html
          end

          private

          # Accepts a tag found in the content and tries to locate matching
          # ContentItem from JSON response.
          #
          # * *Args*:
          #   - *tag* (+string+) A <object data-type="item"> tag found in the content
          #   - *inline_items* (+Array+) ContentItems referenced by the content from the 'modular_content' JSON node
          #
          # * *Returns*:
          #   - +string+ The custom output generated by the +provide_output+ method
          def resolve_tag(tag, inline_items)
            matches = inline_items.select { |item| item.system.codename == tag['data-codename'].to_s }
            provide_output matches
          end

          # Generates custom output for a content item using the +resolve_item+
          # method.
          #
          # * *Args*:
          #   - *matches* (+Array+) The ContentItems from the 'modular_content' JSON node which match the code name of a particular <object data-type="item"> tag
          #
          # * *Returns*:
          #   - +string+ The custom output generated by the +resolve_item+ method
          def provide_output(matches)
            if !matches.empty?
              if @callback.nil?
                resolve_item matches[0]
              else
                @callback.call matches[0]
              end
            end
          end
        end
      end
    end
  end
end