Module: NavigationHelper

Defined in:
lib/nexmo_developer/app/helpers/navigation_helper.rb

Instance Method Summary collapse

Instance Method Details

#navigation_from_content(content:, title: nil) ⇒ Object 



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# File 'lib/nexmo_developer/app/helpers/navigation_helper.rb', line 12

def navigation_from_content(content:, title: nil)
  content = "<h0 class='injected'>#{title}</h0>\n" + content if title
  document = build_document(content)

  nodes = ['<ul class="Vlt-sidemenu Vlt-sidemenu--flat navigation js-navigation"><h4>On this page: </h4>']
  last_node = nil

  document.css('.reveal').remove

  document.css('h0,h2,h3,h4,h5,h6').each do |heading|
    # If it's a header within tabbed content (including Code Snippets) we don't want to treat
    # the header as a navigation item in the sidebar
    next unless heading.ancestors('.Vlt-tabs').empty?

    # Same with callouts
    next unless heading.ancestors('.Vlt-callout').empty?

    if last_node.nil? || heading.name == last_node.name
      # Do nothing (cleaner than adding wrapping further conditions)
    elsif heading.name >= last_node.name # e.g. h2 -> h3
      nodes << '<ul>'
    else # e.g. h4 -> h2
      (HEADING_TAG_DEPTHS[last_node.name] - HEADING_TAG_DEPTHS[heading.name]).times do
        nodes << '</li></ul>'
      end
    end

    nodes << <<~HEREDOC
      <li>
        <a class="Vlt-sidemenu__link" href="##{heading.attributes['id']}" data-scrollspy-id="#{heading['data-id']}">
          #{heading.text}
        </a>
    HEREDOC
    last_node = heading
  end
  nodes << '</li></ul>'
  nodes.join("\n").html_safe
end