website/gems/lib/asciidoctor/chat-block-processor/extension.rb

# frozen_string_literal: true

class ChatBlock < Asciidoctor::Extensions::BlockProcessor
  use_dsl

  named :chat
  on_context :example
  name_positional_attributes 'avatar', 'state'
  default_attributes 'state' => 'default', 'avatarstype' => 'avif'

  def process(parent, reader, attrs)
    block = create_block parent, :pass, nil, attrs, content_model: :compound
    block.add_role('dialogblock')

    # You can think of this section as a pipeline constructing the HTML
    # component for this block. Specifically, we're building one component that
    # contains two output: the dialog image of our avatar and its content.
    attrs['name'] ||= attrs['avatar']

    block << (create_html_fragment block, %(
      <div role="figure" class="dialogblock dialogblock__box dialogblock__avatar--#{attrs['avatar']} #{attrs['role']}">
        <div class="dialogblock dialogblock__avatar">
    ))

    attrs['avatarsdir'] ||= File.expand_path('./avatars', attrs['iconsdir'])

    avatar_sticker = "#{attrs['avatar'].to_kebab}/#{attrs['state'].to_kebab}.#{attrs['avatarstype']}"
    avatar_img_attrs = {
      'target' => parent.image_uri(avatar_sticker, 'avatarsdir'),
      'alt' => attrs['name']
    }
    avatar_imgblock = create_image_block block, avatar_img_attrs

    block << avatar_imgblock
    block << (create_html_fragment block, %(
        </div>
        <div class="dialogblock dialogblock__text">
          <small class="dialogblock dialogblock__avatar-name">#{attrs['name']}</small>
    ))

    parse_content block, reader

    block << (create_html_fragment block, %(
        </div>
      </div>
    ))

    block
  end

  private

  def create_html_fragment(parent, html, attributes = nil)
    create_block parent, :pass, html, attributes
  end
end