Class: Asciidoctor::Revealjs::Converter

Inherits:
Converter::Base
  • Object
show all
Defined in:
lib/asciidoctor_revealjs/converter.rb

Overview

Reveal.js converter

Defined Under Namespace

Modules: Footnotes

Constant Summary collapse

SLICE_HINT_RX = 
/  +/.freeze
DEFAULT_TOCLEVELS =

Defaults (from the asciidoctor-html5s project).

2
DEFAULT_SECTNUMLEVELS = 
3
STEM_EQNUMS_AMS = 
'ams'
STEM_EQNUMS_NONE = 
'none'
STEM_EQNUMS_VALID_VALUES = 
[
  STEM_EQNUMS_NONE,
  STEM_EQNUMS_AMS,
  'all'
].freeze
MATHJAX_VERSION = 
'3.2.0'
REVEALJS_LAYOUT_ROLES =

reveal.js layout utility classes (https://revealjs.com/layout/) that style their direct children, e.g. .r-stack > *. See convert_open.

%w[r-stack r-hstack r-vstack].freeze

Instance Method Summary collapse

Constructor Details

#initialize(backend, opts = {}) ⇒ Converter

Returns a new instance of Converter.



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# File 'lib/asciidoctor_revealjs/converter.rb', line 80

def initialize(backend, opts = {})
  super
  basebackend 'html' if respond_to? :basebackend
  outfilesuffix '.html' if respond_to? :outfilesuffix
  filetype 'html' if respond_to? :filetype
  supports_templates if respond_to? :supports_templates

  delegate_backend = (opts[:delegate_backend] || 'html5').to_s
  factory = ::Asciidoctor::Converter::Factory

  converter = factory.create(delegate_backend, backend_info)
  @delegate_converter = if converter == self
                          factory.new.create(delegate_backend, backend_info)
                        else
                          converter
                        end
end

Instance Method Details

Copied from asciidoctor/lib/asciidoctor/converter/html5.rb (method is private)



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1071

def append_link_constraint_attrs(node, attrs = [])
  rel = 'nofollow' if node.option? 'nofollow'
  if (window = node.attributes['window'])
    attrs << %( target="#{window}")
    attrs << (rel ? %( rel="#{rel} noopener") : ' rel="noopener"') if window == '_blank' || (node.option? 'noopener')
  elsif rel
    attrs << %( rel="#{rel}")
  end
  attrs
end

#attributes(pairs) ⇒ String

Serializes a Hash of attributes into the string that goes inside an opening tag, e.g. { id: 'x', class: ['a', nil, 'b'] } => %( id="x" class="a b").

The HTML tag itself is written literally at the call site; only this (genuinely data-driven) part is factored out. The rules are:

  • nil, false and empty values are omitted (so an absent id produces nothing rather than id="");
  • true produces a boolean attribute (just the name, e.g. controls);
  • Array values are compacted and joined with a space (and omitted if the array collapses to nothing), just like Slim does for class lists.

Parameters:

  • pairs (Hash)

Returns:

  • (String) —

    the attributes string with a leading space, or '' if none.



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1189

def attributes(pairs)
  pairs.inject(+'') do |str, (k, v)|
    v = v.compact.join(' ') if v.is_a? Array
    next str unless v && (v == true || !v.nil_or_empty?)

    str << (v == true ? %( #{k}) : %( #{k}="#{v}"))
  end
end

#bool_data_attr(node, val) ⇒ Object

If the AsciiDoc attribute doesn't exist, no HTML attribute is added If the AsciiDoc attribute exist and is a true value, HTML attribute is enabled (bool) If the AsciiDoc attribute exist and is a false value, HTML attribute is a false string Ex: a feature is enabled globally but can be disabled using a data- attribute on individual items :revealjs_previewlinks: True then link::example.com[Link text, preview=false] Here the template must have data-preview-link="false" not just no data-preview-link attribute



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1152

def bool_data_attr(node, val)
  return false unless node.attr?(val)

  if node.attr(val).downcase == 'false' || node.attr(val) == '0'
    'false'
  else
    true
  end
end

#convert(node, transform = nil, opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 98

def convert(node, transform = nil, opts = {})
  meth_name = "convert_#{transform || node.node_name}"
  opts ||= {}
  converter = respond_to?(meth_name) ? self : @delegate_converter

  if opts.empty?
    converter.send(meth_name, node)
  else
    converter.send(meth_name, node, opts)
  end
end

#convert_admonition(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 110

def convert_admonition(node, _opts = {})
  if (node.has_role? 'aside') || (node.has_role? 'speaker') || (node.has_role? 'notes')
    %(<aside class="notes">#{resolve_content(node)}</aside>)
  else
    attrs = attributes({ id: node.id,
                         class: ['admonitionblock', (node.attr :name), node.role, ('fragment' if step?(node))] }.merge(data_attrs(node.attributes)))
    icon = if node.document.attr? :icons, 'font'
             icon_mapping = { 'caution' => 'fire', 'important' => 'exclamation-circle', 'note' => 'info-circle', 'tip' => 'lightbulb-o',
                              'warning' => 'warning' }
             %(<i#{attributes(class: %(fa fa-#{icon_mapping[node.attr :name]}), title: (node.attr :textlabel || node.caption))}></i>)
           elsif node.document.attr? :icons
             %(<img#{attributes(src: node.icon_uri(node.attr(:name)), alt: node.caption)}>)
           else
             %(<div class="title">#{(node.attr :textlabel) || node.caption}</div>)
           end
    cell = +''
    cell << %(<div class="title">#{node.title}</div>) if node.title?
    cell << node.content.to_s
    %(<div#{attrs}><table><tr><td class="icon">#{icon}</td><td class="content">#{cell}</td></tr></table></div>)
  end
end

#convert_audio(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 132

def convert_audio(node, _opts = {})
  attrs = attributes({ id: node.id, class: ['audioblock', node.style, node.role] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.captioned_title}</div>) if node.title?
  buf << %(<div class="content">)
  buf << %(<audio#{attributes(src: node.media_uri(node.attr(:target)), autoplay: (node.option? 'autoplay'), controls: !(node.option? 'nocontrols'),
                              loop: (node.option? 'loop'))}>Your browser does not support the audio tag.</audio>)
  buf << %(</div>)
  %(<div#{attrs}>#{buf}</div>)
end

#convert_colist(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 143

def convert_colist(node, _opts = {})
  attrs = attributes({ id: node.id, class: ['colist', node.style, node.role] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.title}</div>) if node.title?
  if node.document.attr? :icons
    font_icons = node.document.attr? :icons, 'font'
    buf << '<table>'
    node.items.each_with_index do |item, i|
      num = i + 1
      cell = +'<td>'
      if font_icons
        cell << %(<i#{attributes(class: 'conum', 'data-value' => num)}></i>)
        cell << %(<b>#{num}</b>)
      else
        cell << %(<img#{attributes(src: node.icon_uri("callouts/#{num}"), alt: num)}>)
      end
      cell << %(</td><td>#{item.text}</td>)
      buf << %(<tr#{attributes(class: ('fragment' if step_or_role?(node)))}>#{cell}</tr>)
    end
    buf << '</table>'
  else
    buf << '<ol>'
    node.items.each do |item|
      buf << %(<li#{attributes(class: ('fragment' if step_or_role?(node)))}><p>#{item.text}</p></li>)
    end
    buf << '</ol>'
  end
  %(<div#{attrs}>#{buf}</div>)
end

#convert_dlist(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 173

def convert_dlist(node, _opts = {})
  case node.style
  when 'qanda'
    attrs = attributes({ id: node.id, class: ['qlist', node.style, node.role] }.merge(data_attrs(node.attributes)))
    buf = +''
    buf << %(<div class="title">#{node.title}</div>) if node.title?
    buf << '<ol>'
    node.items.each do |questions, answer|
      buf << '<li>'
      [*questions].each do |question|
        buf << %(<p><em>#{question.text}</em></p>)
      end
      unless answer.nil?
        buf << %(<p>#{answer.text}</p>) if answer.text?
        buf << answer.content.to_s if answer.blocks?
      end
      buf << '</li>'
    end
    buf << '</ol>'
  when 'horizontal'
    attrs = attributes({ id: node.id, class: ['hdlist', node.role] }.merge(data_attrs(node.attributes)))
    buf = +''
    buf << %(<div class="title">#{node.title}</div>) if node.title?
    buf << '<table>'
    if (node.attr? :labelwidth) || (node.attr? :itemwidth)
      buf << '<colgroup>'
      buf << %(<col#{attributes(style: (node.attr?(:labelwidth) ? %(width:#{(node.attr :labelwidth).chomp '%'}%;) : nil))}>)
      buf << %(<col#{attributes(style: (node.attr?(:itemwidth) ? %(width:#{(node.attr :itemwidth).chomp '%'}%;) : nil))}>)
      buf << '</colgroup>'
    end
    node.items.each do |terms, dd|
      buf << '<tr>'
      cell = +''
      terms = [*terms]
      last_term = terms.last
      terms.each do |dt|
        cell << dt.text.to_s
        cell << '<br>' if dt != last_term
      end
      buf << %(<td#{attributes(class: ['hdlist1', ('strong' if node.option? 'strong')])}>#{cell}</td>)
      buf << '<td class="hdlist2">'
      unless dd.nil?
        buf << %(<p>#{dd.text}</p>) if dd.text?
        buf << dd.content.to_s if dd.blocks?
      end
      buf << '</td></tr>'
    end
    buf << '</table>'
  else
    attrs = attributes({ id: node.id, class: ['dlist', node.style, node.role] }.merge(data_attrs(node.attributes)))
    buf = +''
    buf << %(<div class="title">#{node.title}</div>) if node.title?
    buf << '<dl>'
    node.items.each do |terms, dd|
      [*terms].each do |dt|
        buf << %(<dt#{attributes(class: ('hdlist1' unless node.style))}>#{dt.text}</dt>)
      end
      next if dd.nil?

      buf << '<dd>'
      buf << %(<p>#{dd.text}</p>) if dd.text?
      buf << dd.content.to_s if dd.blocks?
      buf << '</dd>'
    end
    buf << '</dl>'
  end
  %(<div#{attrs}>#{buf}</div>)
end

#convert_document(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 881

def convert_document(node, _opts = {})
  slides_content = node.content
  slides = lambda do
    buf = +''
    unless node.noheader
      buf << docinfo_content(node, '-revealjs.html', :'slides-header')
      buf << convert(node, 'title_slide') if node.header? && !node.notitle
    end
    buf << slides_content.to_s
    buf << docinfo_content(node, '-revealjs.html', :'slides-footer')
    buf
  end

  revealjsdir = (node.attr :revealjsdir, 'reveal.js')
  unless (asset_uri_scheme = (node.attr 'asset-uri-scheme', 'https')).empty?
    asset_uri_scheme = %(#{asset_uri_scheme}:)
  end
  cdn_base = %(#{asset_uri_scheme}//cdnjs.cloudflare.com/ajax/libs)

  buf = +'<!DOCTYPE html><html'
  lang = (node.attr :lang, 'en' unless node.attr? :nolang)
  buf << %( lang="#{lang}") if lang
  buf << '><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no, minimal-ui">'
  buf << %(<title>#{node.doctitle sanitize: true, use_fallback: true}</title>)

  %i[description keywords author copyright].each do |key|
    buf << %(<meta#{attributes(name: key.to_s, content: (node.attr key))}>) if node.attr? key
  end
  if node.attr? 'favicon'
    if (icon_href = node.attr 'favicon').empty?
      icon_href = 'favicon.ico'
      icon_type = 'image/x-icon'
    elsif (icon_ext = File.extname icon_href)
      icon_type = icon_ext == '.ico' ? 'image/x-icon' : %(image/#{icon_ext.slice 1, icon_ext.length})
    else
      icon_type = 'image/x-icon'
    end
    buf << %(<link rel="icon" type="#{icon_type}" href="#{icon_href}">)
  end
  linkcss = (node.attr? 'linkcss')
  buf << %(<link rel="stylesheet" href="#{revealjsdir}/dist/reset.css"><link rel="stylesheet" href="#{revealjsdir}/dist/reveal.css">)
  # Default theme required even when using custom theme
  buf << %(<link#{attributes(rel: 'stylesheet',
                             href: (node.attr :revealjs_customtheme, %(#{revealjsdir}/dist/theme/#{node.attr 'revealjs_theme', 'black'}.css)), id: 'theme')}>)
  buf << %(<!--This CSS is generated by the Asciidoctor reveal.js converter to further integrate AsciiDoc's existing semantic with reveal.js-->)
  buf << %(<style type="text/css">#{Asciidoctor::Revealjs::Stylesheet::COMPATIBILITY}</style>)
  if node.attr? :icons, 'font'
    # iconfont-remote is implicitly set by Asciidoctor core. See https://github.com/asciidoctor/asciidoctor.org/issues/361
    if node.attr? 'iconfont-remote'
      if (iconfont_cdn = (node.attr 'iconfont-cdn'))
        buf << %(<link#{attributes(rel: 'stylesheet', href: iconfont_cdn)}>)
      else
        # default icon font is Font Awesome
        font_awesome_version = (node.attr 'font-awesome-version', '5.15.1')
        buf << %(<link#{attributes(rel: 'stylesheet', href: %(#{cdn_base}/font-awesome/#{font_awesome_version}/css/all.min.css))}>)
        buf << %(<link#{attributes(rel: 'stylesheet', href: %(#{cdn_base}/font-awesome/#{font_awesome_version}/css/v4-shims.min.css))}>)
      end
    else
      buf << %(<link#{attributes(rel: 'stylesheet',
                                 href: (node.normalize_web_path %(#{node.attr 'iconfont-name', 'font-awesome'}.css),
                                                                (node.attr 'stylesdir', ''), false))}>)
    end
  end
  buf << generate_stem(node, cdn_base).to_s
  syntax_hl = node.syntax_highlighter
  buf << (syntax_hl.docinfo :head, node, cdn_base_url: cdn_base, linkcss: linkcss, self_closing_tag_slash: '/').to_s if syntax_hl&.docinfo? :head
  if node.attr? :customcss
    buf << %(<link#{attributes(rel: 'stylesheet', href: ((customcss = node.attr :customcss).empty? ? 'asciidoctor-revealjs.css' : customcss))}>)
  end
  buf << docinfo_content(node, '-revealjs.html', :head)
  buf << %(</head><body>)
  buf << docinfo_content(node, '-revealjs.html', :header, :'body-header')
  buf << %(<div class="reveal"><div class="slides">)
  # Any section element inside of this container is displayed as a slide
  buf << slides.call
  buf << %(</div></div>)
  buf << Asciidoctor::Revealjs::RevealJsOptions.script(node, revealjsdir)

  buf << (syntax_hl.docinfo :footer, node, cdn_base_url: cdn_base, linkcss: linkcss, self_closing_tag_slash: '/').to_s if syntax_hl&.docinfo? :footer
  buf << docinfo_content(node, '-revealjs.html', :footer, :'body-footer')
  buf << '</body></html>'
  buf
end

#convert_embedded(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 242

def convert_embedded(node, _opts = {})
  buf = +''
  buf << convert(node, 'title_slide') if node.has_header? && !node.notitle
  buf << node.content.to_s
  unless !node.footnotes? || node.attr?(:nofootnotes)
    buf << %(<div id="footnotes"><hr>)
    node.footnotes.each do |fn|
      buf << %(<div class="footnote" id="_footnote_#{fn.index}"><a href="#_footnoteref_#{fn.index}">#{fn.index}</a>. #{fn.text}</div>)
    end
    buf << %(</div>)
  end
  buf
end

#convert_example(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 256

def convert_example(node, _opts = {})
  if node.option? 'collapsible'
    attrs = attributes({ id: node.id, class: [node.role, ('fragment' if step?(node))],
                         open: (true if node.option? 'open') }.merge(data_attrs(node.attributes)))
    summary = node.title? ? %(<summary class="title">#{node.title}</summary>) : '<summary class="title">Details</summary>'
    return %(<details#{attrs}>#{summary}<div class="content">#{node.content}</div></details>)
  end

  attrs = attributes({ id: node.id, class: ['exampleblock', node.role, ('fragment' if step?(node))] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.captioned_title}</div>) if node.title?
  buf << %(<div class="content">#{node.content}</div>)
  %(<div#{attrs}>#{buf}</div>)
end

#convert_floating_title(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 271

def convert_floating_title(node, _opts = {})
  %(<h#{node.level + 1}#{attributes(id: node.id, class: [node.style, node.role])}>#{node.title}</h#{node.level + 1}>)
end

#convert_image(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 275

def convert_image(node, _opts = {})
  return '' if %w[background canvas].include?(node.attributes[1])

  inline_style = [("text-align: #{node.attr :align}" if node.attr? :align), ("float: #{node.attr :float}" if node.attr? :float)].compact.join('; ')
  attrs = attributes({ id: node.id, class: ['imageblock', node.role, ('fragment' if step?(node))],
                       style: inline_style }.merge(data_attrs(node.attributes)))
  buf = +%(<div#{attrs}>#{image_content(node)}</div>)
  buf << %(<div class="title">#{node.captioned_title}</div>) if node.title?
  buf
end

#convert_inline_anchor(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 286

def convert_inline_anchor(node, _opts = {})
  case node.type
  when :xref
    refid = (node.attr :refid) || node.target
    attrs = attributes({ href: node.target, class: [node.role, ('fragment' if step?(node))].compact }.merge(data_attrs(node.attributes)))
    %(<a#{attrs}>#{(node.text || node.document.references[:ids].fetch(refid, "[#{refid}]")).tr_s("\n", ' ')}</a>)
  when :ref
    %(<a#{attributes({ id: node.target }.merge(data_attrs(node.attributes)))}></a>)
  when :bibref
    %(<a#{attributes({ id: node.target }.merge(data_attrs(node.attributes)))}></a>[#{node.target}])
  else
    attrs = attributes({ :href => node.target, :class => [node.role, ('fragment' if step?(node))].compact, :target => (node.attr :window),
                         'data-preview-link' => bool_data_attr(node, :preview) }.merge(data_attrs(node.attributes)))
    %(<a#{attrs}>#{node.text}</a>)
  end
end

#convert_inline_break(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 303

def convert_inline_break(node, _opts = {})
  %(#{node.text}<br>)
end

#convert_inline_button(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 307

def convert_inline_button(node, _opts = {})
  %(<b#{attributes({ class: ['button'] }.merge(data_attrs(node.attributes)))}>#{node.text}</b>)
end

#convert_inline_callout(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 311

def convert_inline_callout(node, _opts = {})
  if node.document.attr? :icons, 'font'
    %(<i#{attributes(class: 'conum', 'data-value' => node.text)}></i><b>(#{node.text})</b>)
  elsif node.document.attr? :icons
    %(<img#{attributes(src: node.icon_uri("callouts/#{node.text}"), alt: node.text)}>)
  else
    %(<b>(#{node.text})</b>)
  end
end

#convert_inline_footnote(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 321

def convert_inline_footnote(node, _opts = {})
  footnote = Footnotes.slide_footnote(node)
  index = footnote.attr(:index)
  id = footnote.id
  if node.type == :xref
    %(<sup#{attributes({ class: ['footnoteref'] }.merge(data_attrs(footnote.attributes)))}>[<span class="footnote" title="View footnote.">#{index}</span>]</sup>)
  else
    %(<sup#{attributes({ id: ("_footnote_#{id}" if id),
                         class: ['footnote'] }.merge(data_attrs(footnote.attributes)))}>[<span class="footnote" title="View footnote.">#{index}</span>]</sup>)
  end
end

#convert_inline_image(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 333

def convert_inline_image(node, _opts = {})
  attrs = attributes({ class: [node.type, node.role, ('fragment' if step?(node))],
                       style: ("float: #{node.attr :float}" if node.attr? :float) }.merge(data_attrs(node.attributes)))
  %(<span#{attrs}>#{inline_image_content(node)}</span>)
end

#convert_inline_indexterm(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 339

def convert_inline_indexterm(node, _opts = {})
  node.type == :visible ? node.text : ''
end

#convert_inline_kbd(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 343

def convert_inline_kbd(node, _opts = {})
  if (keys = node.attr 'keys').size == 1
    %(<kbd#{attributes(data_attrs(node.attributes))}>#{keys.first}</kbd>)
  else
    buf = +''
    keys.each_with_index do |key, idx|
      buf << '+' unless idx.zero?
      buf << %(<kbd>#{key}</kbd>)
    end
    %(<span#{attributes({ class: ['keyseq'] }.merge(data_attrs(node.attributes)))}>#{buf}</span>)
  end
end

#convert_inline_menu(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 356

def convert_inline_menu(node, _opts = {})
  menu = node.attr 'menu'
  menuitem = node.attr 'menuitem'
  if !(submenus = node.attr 'submenus').empty?
    content = %(<span class="menu">#{menu}</span>&#160;&#9656;&#32;) +
              submenus.map { |submenu| %(<span class="submenu">#{submenu}</span>&#160;&#9656;&#32;) }.join +
              %(<span class="menuitem">#{menuitem}</span>)
    %(<span#{attributes({ class: ['menuseq'] }.merge(data_attrs(node.attributes)))}>#{content}</span>)
  elsif !menuitem.nil?
    %(<span#{attributes({ class: ['menuseq'] }.merge(data_attrs(node.attributes)))}><span class="menu">#{menu}</span>&#160;&#9656;&#32;<span class="menuitem">#{menuitem}</span></span>)
  else
    %(<span#{attributes({ class: ['menu'] }.merge(data_attrs(node.attributes)))}>#{menu}</span>)
  end
end

#convert_inline_quoted(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 371

def convert_inline_quoted(node, _opts = {})
  quote_tags = { emphasis: 'em', strong: 'strong', monospaced: 'code', superscript: 'sup', subscript: 'sub' }
  if (quote_tag = quote_tags[node.type])
    %(<#{quote_tag}#{attributes({ id: node.id,
                                  class: [node.role,
                                          ('fragment' if step?(node))].compact }.merge(data_attrs(node.attributes)))}>#{node.text}</#{quote_tag}>)
  else
    case node.type
    when :double
      inline_text_container(node, "&#8220;#{node.text}&#8221;")
    when :single
      inline_text_container(node, "&#8216;#{node.text}&#8217;")
    when :asciimath, :latexmath
      open, close = Asciidoctor::INLINE_MATH_DELIMITERS[node.type]
      inline_text_container(node, "#{open}#{node.text}#{close}")
    else
      inline_text_container(node, node.text)
    end
  end
end

#convert_listing(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 392

def convert_listing(node, _opts = {})
  nowrap = (node.option? 'nowrap') || !(node.document.attr? 'prewrap')
  if node.style == 'source'
    syntax_hl = node.document.syntax_highlighter
    lang = node.attr :language
    if syntax_hl
      doc_attrs = node.document.attributes
      css_mode = (doc_attrs[%(#{syntax_hl.name}-css)] || :class).to_sym
      style = doc_attrs[%(#{syntax_hl.name}-style)]
      hl_opts = syntax_hl.highlight? ? { css_mode: css_mode, style: style } : {}
      hl_opts[:nowrap] = nowrap
    end
  end
  # data-id must not be declared on the <div> element (but on the <pre> element for auto-animate)
  attrs = attributes({ id: node.id, class: ['listingblock', node.role, ('fragment' if step?(node))] }.merge(data_attrs(node.attributes.reject do |key, _|
    key == 'data-id'
  end)))
  buf = +''
  buf << %(<div class="title">#{node.captioned_title}</div>) if node.title?
  buf << %(<div class="content">)
  if syntax_hl
    buf << (syntax_hl.format node, lang, hl_opts).to_s
  elsif node.style == 'source'
    code = %(<code#{attributes({ class: [("language-#{lang}" if lang)], 'data-lang' => (lang.to_s if lang) })}>#{node.content || ''}</code>)
    buf << %(<pre#{attributes(class: ['highlight', ('nowrap' if nowrap)])}>#{code}</pre>)
  else
    buf << %(<pre#{attributes({ class: [('nowrap' if nowrap)] })}>#{node.content || ''}</pre>)
  end
  buf << %(</div>)
  %(<div#{attrs}>#{buf}</div>)
end

#convert_literal(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 424

def convert_literal(node, _opts = {})
  attrs = attributes({ id: node.id, class: ['literalblock', node.role, ('fragment' if step?(node))] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.title}</div>) if node.title?
  buf << %(<div class="content">)
  buf << %(<pre#{attributes({ class: (!(node.document.attr? :prewrap) || (node.option? 'nowrap') ? 'nowrap' : nil) })}>#{node.content}</pre>)
  buf << %(</div>)
  %(<div#{attrs}>#{buf}</div>)
end

#convert_olist(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 434

def convert_olist(node, _opts = {})
  attrs = attributes({ id: node.id, class: ['olist', node.style, node.role] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.title}</div>) if node.title?
  inner = +''
  node.items.each do |item|
    li = +%(<p>#{item.text}</p>)
    li << item.content.to_s if item.blocks?
    inner << %(<li#{attributes(class: ('fragment' if step_or_role?(node)))}>#{li}</li>)
  end
  buf << %(<ol#{attributes(class: node.style, start: (node.attr :start), type: node.list_marker_keyword)}>#{inner}</ol>)
  %(<div#{attrs}>#{buf}</div>)
end

#convert_open(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 448

def convert_open(node, _opts = {})
  if node.style == 'abstract'
    if node.parent == node.document && node.document.doctype == 'book'
      puts 'asciidoctor: WARNING: abstract block cannot be used in a document without a title when doctype is book. Excluding block content.'
      ''
    else
      attrs = attributes({ id: node.id, class: ['quoteblock', 'abstract', node.role, ('fragment' if step?(node))] }.merge(data_attrs(node.attributes)))
      buf = +''
      buf << %(<div class="title">#{node.title}</div>) if node.title?
      buf << %(<blockquote>#{node.content}</blockquote>)
      %(<div#{attrs}>#{buf}</div>)
    end
  elsif node.style == 'partintro' && (node.level != 0 || node.parent.context != :section || node.document.doctype != 'book')
    puts 'asciidoctor: ERROR: partintro block can only be used when doctype is book and it\'s a child of a book part. Excluding block content.'
    ''
  elsif (node.has_role? 'aside') || (node.has_role? 'speaker') || (node.has_role? 'notes')
    %(<aside class="notes">#{resolve_content(node)}</aside>)
  else
    attrs = attributes({ id: node.id,
                         class: ['openblock', (node.style == 'open' ? nil : node.style), node.role, ('fragment' if step?(node))] }.merge(data_attrs(node.attributes)))
    buf = +''
    buf << %(<div class="title">#{node.title}</div>) if node.title?
    # reveal.js's r-stack/r-hstack/r-vstack layout utilities style their *direct*
    # children (e.g. `.r-stack > *` for absolute stacking); the usual .content
    # wrapper would put a block's content one level too deep for them to apply.
    buf << if (REVEALJS_LAYOUT_ROLES & node.roles).empty?
             %(<div class="content">#{node.content}</div>)
           else
             node.content.to_s
           end
    %(<div#{attrs}>#{buf}</div>)
  end
end

#convert_outline(node, opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 482

def convert_outline(node, opts = {})
  return '' if node.sections.empty?

  toclevels = (opts[:toclevels] if opts) || (node.document.attr 'toclevels', DEFAULT_TOCLEVELS).to_i
  slevel = section_level node.sections.first
  buf = +%(<ol class="sectlevel#{slevel}">)
  node.sections.each do |sec|
    next if sec.title == '!'

    buf << %(<li><a href="##{sec.id}">#{section_title sec}</a>)
    if (sec.level < toclevels) && (child_toc = convert(sec, 'outline'))
      buf << child_toc.to_s
    end
    buf << '</li>'
  end
  buf << '</ol>'
  buf
end

#convert_page_break(_node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 501

def convert_page_break(_node, _opts = {})
  %(<div style="page-break-after: always;"></div>)
end

#convert_paragraph(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 505

def convert_paragraph(node, _opts = {})
  attrs = attributes({ id: node.id, class: ['paragraph', node.role, ('fragment' if step?(node))] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.title}</div>) if node.title?
  buf << (node.has_role?('small') ? %(<small>#{node.content}</small>) : %(<p>#{node.content}</p>))
  %(<div#{attrs}>#{buf}</div>)
end

#convert_pass(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 513

def convert_pass(node, _opts = {})
  node.content.to_s
end

#convert_preamble(_node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 517

def convert_preamble(_node, _opts = {})
  # preamble is shown on the title slide which is rendered by the document method
  ''
end

#convert_quote(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 522

def convert_quote(node, _opts = {})
  attrs = attributes({ id: node.id, class: ['quoteblock', node.role, ('fragment' if step?(node))] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.title}</div>) if node.title?
  buf << %(<blockquote>#{node.content}</blockquote>)
  attribution = node.attr?(:attribution) ? (node.attr :attribution) : nil
  citetitle = node.attr?(:citetitle) ? (node.attr :citetitle) : nil
  if attribution || citetitle
    buf << %(<div class="attribution">)
    buf << %(<cite>#{citetitle}</cite>) if citetitle
    if attribution
      buf << '<br>' if citetitle
      buf << %(&#8212; #{attribution})
    end
    buf << %(</div>)
  end
  %(<div#{attrs}>#{buf}</div>)
end

#convert_section(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 541

def convert_section(node, _opts = {})
  # OPTIONS PROCESSING
  # hide slides on %conceal, %notitle and named "!"
  titleless = (title = node.title) == '!'
  hide_title = titleless || (node.option? :notitle) || (node.option? :conceal)

  vertical_slides = node.find_by(context: :section) { |section| section.level == 2 }

  # extracting block image attributes to find an image to use as a background_image attribute
  data_background_image = data_background_size = data_background_repeat = data_background_position = data_background_transition = nil
  data_background_video = data_background_color = nil

  # process the first image block in the current section that acts as a background
  section_images = node.blocks.map do |block|
    if (ctx = block.context) == :image
      %w[background canvas].include?(block.attributes[1]) ? block : []
    elsif ctx == :section
      []
    else
      block.find_by(context: :image) { |image| %w[background canvas].include?(image.attributes[1]) } || []
    end
  end
  if (bg_image = section_images.flatten.first)
    data_background_image = node.image_uri(bg_image.attr('target'))
    # make sure no crash on nil and default values make sense
    data_background_size = bg_image.attr 'size'
    data_background_repeat = bg_image.attr 'repeat'
    data_background_transition = bg_image.attr 'transition'
    data_background_position = bg_image.attr 'position'
  end

  # background-image section attribute overrides the image one
  data_background_image = node.image_uri(node.attr('background-image')) if node.attr? 'background-image'
  data_background_video = node.media_uri(node.attr('background-video')) if node.attr? 'background-video'
  data_background_color = node.attr 'background-color' if node.attr? 'background-color'

  parent_section_with_vertical_slides = node.level == 1 && !vertical_slides.empty?

  footnotes = lambda do
    slide_fn = Footnotes.slide_footnotes(node)
    if node.document.footnotes? && !(node.parent.attr? 'nofootnotes') && !slide_fn.empty?
      %(<div class="footnotes">#{slide_fn.map { |footnote| %(<div class="footnote">#{footnote.index}. #{footnote.text}</div>) }.join}</div>)
    else
      ''
    end
  end

  section = lambda do
    attrs = attributes({
      :id => (titleless ? nil : node.id),
      :class => node.roles,
      'data-background-gradient' => (node.attr 'background-gradient'),
      'data-transition' => (node.attr 'transition'),
      'data-transition-speed' => (node.attr 'transition-speed'),
      'data-background-color' => data_background_color,
      'data-background-image' => data_background_image,
      'data-background-size' => data_background_size || node.attr('background-size'),
      'data-background-repeat' => data_background_repeat || node.attr('background-repeat'),
      'data-background-transition' => data_background_transition || node.attr('background-transition'),
      'data-background-position' => data_background_position || node.attr('background-position'),
      'data-background-iframe' => (node.attr 'background-iframe'),
      'data-background-video' => data_background_video,
      'data-background-video-loop' => (node.attr? 'background-video-loop') || (node.option? 'loop'),
      'data-background-video-muted' => (node.attr? 'background-video-muted') || (node.option? 'muted'),
      'data-background-opacity' => (node.attr 'background-opacity'),
      'data-autoslide' => (node.attr 'autoslide'),
      'data-state' => (node.attr 'state'),
      'data-auto-animate' => (node.attr? 'auto-animate') || (node.option? 'auto-animate'),
      'data-auto-animate-easing' => (node.attr 'auto-animate-easing') || (node.option? 'auto-animate-easing'),
      'data-auto-animate-unmatched' => (node.attr 'auto-animate-unmatched') || (node.option? 'auto-animate-unmatched'),
      'data-auto-animate-duration' => (node.attr 'auto-animate-duration') || (node.option? 'auto-animate-duration'),
      'data-auto-animate-id' => (node.attr 'auto-animate-id'),
      'data-auto-animate-restart' => (node.attr? 'auto-animate-restart') || (node.option? 'auto-animate-restart')
    }.merge(data_attrs(node.attributes)) { |_key, known_value, _passthrough_value| known_value })
    inner = +''
    inner << docinfo_content(node.document, '-revealjs.html', :'slide-header')
    inner << %(<h2>#{section_title node}</h2>) unless hide_title
    if parent_section_with_vertical_slides
      unless (blocks = node.blocks - vertical_slides).empty?
        inner << %(<div class="slide-content">#{blocks.map(&:convert).join}</div>)
      end
    else
      unless (content = node.content.chomp).empty?
        inner << %(<div class="slide-content">#{content}</div>)
      end
    end
    inner << footnotes.call
    inner << docinfo_content(node.document, '-revealjs.html', :'slide-footer')
    buf = %(<section#{attrs}>#{inner}</section>)
    Footnotes.clear_slide_footnotes
    buf
  end

  # RENDERING
  if parent_section_with_vertical_slides
    # render parent section of vertical slides set
    %(<section>#{section.call}#{vertical_slides.map(&:convert).join}</section>)
  elsif node.level >= 3
    # dynamic tags which maps <hX> with level
    %(<h#{node.level}>#{title}</h#{node.level}>#{node.content.chomp})
  else
    # render standalone slides (or vertical slide subsection)
    section.call
  end
end

#convert_sidebar(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 647

def convert_sidebar(node, _opts = {})
  if (node.has_role? 'aside') || (node.has_role? 'speaker') || (node.has_role? 'notes')
    %(<aside class="notes">#{resolve_content(node)}</aside>)
  else
    attrs = attributes({ id: node.id, class: ['sidebarblock', node.role, ('fragment' if step_or_role?(node))] }.merge(data_attrs(node.attributes)))
    buf = +%(<div class="content">)
    buf << %(<div class="title">#{node.title}</div>) if node.title?
    buf << node.content.to_s
    buf << %(</div>)
    %(<div#{attrs}>#{buf}</div>)
  end
end

#convert_stem(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 660

def convert_stem(node, _opts = {})
  open, close = Asciidoctor::BLOCK_MATH_DELIMITERS[node.style.to_sym]
  equation = node.content.strip
  equation = node.sub_specialcharacters equation if (node.subs.nil? || node.subs.empty?) && !(node.attr? 'subs')
  equation = %(#{open}#{equation}#{close}) unless (equation.start_with? open) && (equation.end_with? close)
  attrs = attributes({ id: node.id, class: ['stemblock', node.role, ('fragment' if step_or_role?(node))] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.title}</div>) if node.title?
  buf << %(<div class="content">#{equation}</div>)
  %(<div#{attrs}>#{buf}</div>)
end

#convert_table(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 672

def convert_table(node, _opts = {})
  classes = ['tableblock', "frame-#{node.attr :frame, 'all'}", "grid-#{node.attr :grid, 'all'}", node.role, ('fragment' if step?(node))]
  styles = [("width:#{node.attr :tablepcwidth}%" unless node.option? 'autowidth'), ("float:#{node.attr :float}" if node.attr? :float)].compact.join('; ')
  attrs = attributes({ id: node.id, class: classes, style: styles }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<caption class="title">#{node.captioned_title}</caption>) if node.title?
  unless (node.attr :rowcount).zero?
    buf << '<colgroup>'
    if node.option? 'autowidth'
      node.columns.each { buf << '<col>' }
    else
      node.columns.each { |col| buf << %(<col style="width:#{col.attr :colpcwidth}%">) }
    end
    buf << '</colgroup>'
    rowstep = node.option? 'rowstep'
    %i[head foot body].reject { |tblsec| node.rows[tblsec].empty? }.each do |tblsec|
      buf << %(<t#{tblsec}>)
      node.rows[tblsec].each do |row|
        buf << %(<tr#{attributes(class: ('fragment' if rowstep && tblsec == :body))}>)
        row.each do |cell|
          # store reference of content in advance to resolve attribute assignments in cells
          cell_content = if tblsec == :head
                           cell.text
                         else
                           case cell.style
                           when :literal
                             cell.text
                           else
                             cell.content
                           end
                         end
          cell_attrs = attributes(
            class: ['tableblock', "halign-#{cell.attr :halign}", "valign-#{cell.attr :valign}"],
            colspan: cell.colspan, rowspan: cell.rowspan,
            style: (node.document.attr?(:cellbgcolor) ? %(background-color:#{node.document.attr :cellbgcolor};) : nil)
          )
          cell_inner = if tblsec == :head
                         cell_content.to_s
                       else
                         case cell.style
                         when :asciidoc
                           %(<div>#{cell_content}</div>)
                         when :literal
                           %(<div class="literal"><pre>#{cell_content}</pre></div>)
                         when :header
                           cell_content.map { |text| %(<p class="tableblock header">#{text}</p>) }.join
                         else
                           cell_content.map { |text| %(<p class="tableblock">#{text}</p>) }.join
                         end
                       end
          tag = tblsec == :head || cell.style == :header ? 'th' : 'td'
          buf << %(<#{tag}#{cell_attrs}>#{cell_inner}</#{tag}>)
        end
        buf << '</tr>'
      end
    end
  end
  %(<table#{attrs}>#{buf}</table>)
end

#convert_thematic_break(_node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 732

def convert_thematic_break(_node, _opts = {})
  '<hr>'
end

#convert_title_slide(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 736

def convert_title_slide(node, _opts = {})
  bg_image = node.attr?('title-slide-background-image') ? node.image_uri(node.attr('title-slide-background-image')) : nil
  bg_video = node.attr?('title-slide-background-video') ? node.media_uri(node.attr('title-slide-background-video')) : nil
  attrs = attributes({
    :class => ['title', node.role],
    'data-state' => 'title',
    'data-transition' => (node.attr 'title-slide-transition'),
    'data-transition-speed' => (node.attr 'title-slide-transition-speed'),
    'data-background' => (node.attr 'title-slide-background'),
    'data-background-gradient' => (node.attr 'title-slide-background-gradient'),
    'data-background-size' => (node.attr 'title-slide-background-size'),
    'data-background-image' => bg_image,
    'data-background-video' => bg_video,
    'data-background-video-loop' => (node.attr 'title-slide-background-video-loop'),
    'data-background-video-muted' => (node.attr 'title-slide-background-video-muted'),
    'data-background-opacity' => (node.attr 'title-slide-background-opacity'),
    'data-background-iframe' => (node.attr 'title-slide-background-iframe'),
    'data-background-color' => (node.attr 'title-slide-background-color'),
    'data-background-repeat' => (node.attr 'title-slide-background-repeat'),
    'data-background-position' => (node.attr 'title-slide-background-position'),
    'data-background-transition' => (node.attr 'title-slide-background-transition')
  }.merge(data_attrs(node.attributes)) { |_key, known_value, _passthrough_value| known_value })
  buf = +''
  buf << if (title_obj = node.doctitle partition: true, use_fallback: true).subtitle?
           %(<h1>#{slice_text node, title_obj.title, (header_slice = node.header.option? :slice)}</h1><h2>#{slice_text node, title_obj.subtitle, header_slice}</h2>)
         else
           %(<h1>#{node.header.title}</h1>)
         end
  preamble = node.document.find_by context: :preamble
  buf << %(<div class="preamble">#{preamble.pop.content}</div>) unless preamble.nil? || preamble.empty?
  buf << generate_authors(node.document).to_s
  %(<section#{attrs}>#{buf}</section>)
end

#convert_toc(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 770

def convert_toc(node, _opts = {})
  content = %(<div id="toctitle">#{node.document.attr 'toc-title'}</div>) +
            convert(node.document, 'outline').to_s
  %(<div#{attributes(id: 'toc', class: (node.document.attr 'toc-class', 'toc'))}>#{content}</div>)
end

#convert_ulist(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 776

def convert_ulist(node, _opts = {})
  if (checklist = node.option?(:checklist) ? 'checklist' : nil)
    if node.option? :interactive
      marker_checked = '<input type="checkbox" data-item-complete="1" checked>'
      marker_unchecked = '<input type="checkbox" data-item-complete="0">'
    elsif node.document.attr? :icons, 'font'
      marker_checked = '<i class="fa fa-check-square-o"></i>'
      marker_unchecked = '<i class="fa fa-square-o"></i>'
    else
      # could use &#9745 (checked ballot) and &#9744 (ballot) w/o font instead
      marker_checked = '<input type="checkbox" data-item-complete="1" checked disabled>'
      marker_unchecked = '<input type="checkbox" data-item-complete="0" disabled>'
    end
  end
  attrs = attributes({ id: node.id, class: ['ulist', checklist, node.style, node.role] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.title}</div>) if node.title?
  inner = +''
  node.items.each do |item|
    li = +'<p>'
    li << if checklist && (item.attr? :checkbox)
            %(#{item.attr?(:checked) ? marker_checked : marker_unchecked}#{item.text})
          else
            item.text.to_s
          end
    li << '</p>'
    li << item.content.to_s if item.blocks?
    inner << %(<li#{attributes(class: ('fragment' if step_or_role?(node)))}>#{li}</li>)
  end
  buf << %(<ul#{attributes(class: checklist || node.style)}>#{inner}</ul>)
  %(<div#{attrs}>#{buf}</div>)
end

#convert_verse(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 809

def convert_verse(node, _opts = {})
  attrs = attributes({ id: node.id, class: ['verseblock', node.role, ('fragment' if step?(node))] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.title}</div>) if node.title?
  buf << %(<pre class="content">#{node.content}</pre>)
  attribution = node.attr?(:attribution) ? (node.attr :attribution) : nil
  citetitle = node.attr?(:citetitle) ? (node.attr :citetitle) : nil
  if attribution || citetitle
    buf << %(<div class="attribution">)
    buf << %(<cite>#{citetitle}</cite>) if citetitle
    if attribution
      buf << '<br>' if citetitle
      buf << %(&#8212; #{attribution})
    end
    buf << %(</div>)
  end
  %(<div#{attrs}>#{buf}</div>)
end

#convert_video(node, _opts = {}) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 828

def convert_video(node, _opts = {})
  # in a slide-deck context we assume video should take as much place as possible
  # unless already specified
  no_stretch = (node.attr? :width) || (node.attr? :height)
  width = node.attr?(:width) ? (node.attr :width) : '100%'
  height = node.attr?(:height) ? (node.attr :height) : '100%'
  # we apply revealjs stretch class to the videoblock take all the place we can
  attrs = attributes({ id: node.id,
                       class: ['videoblock', node.style, node.role, (no_stretch ? nil : 'stretch'), ('fragment' if step_or_role?(node))] }.merge(data_attrs(node.attributes)))
  buf = +''
  buf << %(<div class="title">#{node.captioned_title}</div>) if node.title?
  case node.attr :poster
  when 'vimeo'
    unless (asset_uri_scheme = (node.attr :asset_uri_scheme, 'https')).empty?
      asset_uri_scheme = %(#{asset_uri_scheme}:)
    end
    start_anchor = node.attr?(:start) ? "#at=#{node.attr :start}" : nil
    delimiter = ['?']
    loop_param = node.option?('loop') ? %(#{delimiter.pop || '&amp;'}loop=1) : ''
    muted_param = node.option?('muted') ? %(#{delimiter.pop || '&amp;'}muted=1) : ''
    src = %(#{asset_uri_scheme}//player.vimeo.com/video/#{node.attr :target}#{loop_param}#{muted_param}#{start_anchor})
    # We need to delegate autoplay into the iframe starting with Chrome 62 (and other browsers too)
    # See https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#iframe
    buf << %(<iframe#{attributes(width: width, height: height, src: src, frameborder: 0,
                                 webkitAllowFullScreen: true, mozallowfullscreen: true, allowFullScreen: true,
                                 'data-autoplay' => (node.option? 'autoplay'),
                                 allow: (node.option?('autoplay') ? 'autoplay' : nil))}></iframe>)
  when 'youtube'
    unless (asset_uri_scheme = (node.attr :asset_uri_scheme, 'https')).empty?
      asset_uri_scheme = %(#{asset_uri_scheme}:)
    end
    params = ['rel=0']
    params << "start=#{node.attr :start}" if node.attr? :start
    params << "end=#{node.attr :end}" if node.attr? :end
    params << 'loop=1' if node.option? 'loop'
    params << 'mute=1' if node.option? 'muted'
    params << 'controls=0' if node.option? 'nocontrols'
    src = %(#{asset_uri_scheme}//www.youtube.com/embed/#{node.attr :target}?#{params * '&amp;'})
    # We need to delegate autoplay into the iframe starting with Chrome 62 (and other browsers too)
    # See https://developers.google.com/web/updates/2017/09/autoplay-policy-changes#iframe
    buf << %(<iframe#{attributes(width: width, height: height, src: src,
                                 frameborder: 0, allowfullscreen: !(node.option? 'nofullscreen'),
                                 'data-autoplay' => (node.option? 'autoplay'),
                                 allow: (node.option?('autoplay') ? 'autoplay' : nil))}></iframe>)
  else
    buf << %(<video#{attributes({ src: node.media_uri(node.attr(:target)), width: width, height: height,
                                  poster: (node.attr(:poster) ? node.media_uri(node.attr(:poster)) : nil),
                                  'data-autoplay' => (node.option? 'autoplay'), controls: !(node.option? 'nocontrols'),
                                  loop: (node.option? 'loop'), muted: (node.option? 'muted') })}>Your browser does not support the video tag.</video>)
  end
  %(<div#{attrs}>#{buf}</div>)
end

#data_attrs(attributes) ⇒ Hash

Extracts data- attributes from the attributes.

Parameters:

  • attributes (Hash) —

    (default: {})

Returns:

  • (Hash) —

    a Hash that contains only data- attributes



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1203

def data_attrs(attributes)
  # key can be an Integer (for positional attributes)
  attributes.to_h { |key, value| key == 'step' ? ['data-fragment-index', value] : [key, value] }
            .select { |key, _| key.to_s.start_with?('data-') }
end

#docinfo_content(doc, suffix, *locations) ⇒ Object

Concatenates the docinfo content for one or more locations (e.g. an alias pair like :header and :'body-header'), all sharing the same suffix.



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1066

def docinfo_content(doc, suffix, *locations)
  locations.reduce(+'') { |buf, location| buf << doc.docinfo(location, suffix).to_s }
end

#encode_attribute_value(val) ⇒ Object

Copied from asciidoctor/lib/asciidoctor/converter/html5.rb (method is private)



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1083

def encode_attribute_value(val)
  val.include?('"') ? (val.gsub '"', '&quot;') : val
end

#format_author(node, author) ⇒ Object

TODO:

remove this code when the new converter becomes available in the main gem

Copied from asciidoctor/lib/asciidoctor/converter/semantic-html5.rb which is not yet shipped



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1110

def format_author(node, author)
  %(<span class="author">#{node.sub_replacements author.name}#{%( #{node.sub_macros author.email}) if author.email}</span>)
end

#generate_authors(node) ⇒ Object

TODO:

remove this code when the new converter becomes available in the main gem

Copied from asciidoctor/lib/asciidoctor/converter/semantic-html5.rb which is not yet shipped



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1089

def generate_authors(node)
  return if node.authors.empty?

  if node.authors.length == 1
    # NOTE: the two-space indentation is kept to preserve byte-for-byte
    # compatibility with the output produced by the former Slim pipeline.
    %(<p class="byline">
  #{format_author node, node.authors.first}
  </p>)
  else
    result = ['<ul class="byline">']
    node.authors.each do |author|
      result << "<li>#{format_author node, author}</li>"
    end
    result << '</ul>'
    result.join Asciidoctor::LF
  end
end

#generate_stem(node, cdn_base) ⇒ String

Generate the Mathjax markup to process STEM expressions

Parameters:

  • node (Asciidoctor::Document)
  • cdn_base (String)

Returns:

  • (String) 


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# File 'lib/asciidoctor_revealjs/converter.rb', line 1118

def generate_stem(node, cdn_base)
  return unless node.attr?(:stem)

  eqnums_val = node.attr('eqnums', STEM_EQNUMS_NONE).downcase
  eqnums_val = STEM_EQNUMS_AMS unless STEM_EQNUMS_VALID_VALUES.include?(eqnums_val)
  mathjax_configuration = {
    tex: {
      inlineMath: [Asciidoctor::INLINE_MATH_DELIMITERS[:latexmath]],
      displayMath: [Asciidoctor::BLOCK_MATH_DELIMITERS[:latexmath]],
      processEscapes: false,
      tags: eqnums_val
    },
    options: {
      ignoreHtmlClass: 'nostem|nolatexmath'
    },
    asciimath: {
      delimiters: [Asciidoctor::BLOCK_MATH_DELIMITERS[:asciimath]]
    },
    loader: {
      load: ['input/asciimath', 'output/chtml', 'ui/menu']
    }
  }
  mathjaxdir = node.attr('mathjaxdir', "#{cdn_base}/mathjax/#{MATHJAX_VERSION}/es5")
  %(<script>window.MathJax = #{JSON.generate(mathjax_configuration)};</script>) +
    %(<script async src="#{mathjaxdir}/tex-mml-chtml.js"></script>)
end

#html5_converter(node) ⇒ Object

Retrieves the built-in html5 converter associated with this node.

Returns the instance of the Asciidoctor::Converter::Html5Converter.



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# File 'lib/asciidoctor_revealjs/converter.rb', line 968

def html5_converter(node)
  node.converter.instance_variable_get('@delegate_converter')
end

#image_content(node) ⇒ Object

Builds the inner markup of a block image (without its surrounding div).



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1004

def image_content(node)
  # When the stretch class is present, block images will take the most space
  # they can take. Setting width and height can override that.
  # We pinned the 100% to height to avoid aspect ratio breakage and since
  # widescreen monitors are the most popular, chances are that height will
  # be the biggest constraint
  height_value = if node.has_role?('stretch') && !(node.attr?(:width) || node.attr?(:height))
                   '100%'
                 elsif node.attr? 'height'
                   node.attr 'height'
                 end
  html_attrs = node.attr?('width') ? %( width="#{node.attr 'width'}") : ''
  html_attrs = %(#{html_attrs} height="#{height_value}") if height_value
  html_attrs = %(#{html_attrs} title="#{node.attr 'title'}") if node.attr? 'title'
  html_attrs = %(#{html_attrs} style="background: #{node.attr :background}") if node.attr? 'background'
  img, src = img_tag(node, node.attr('target'), html_attrs)
  img_link(node, src, img)
end

#img_link(node, src, content) ⇒ Object

Wrap the element in a element if the link attribute is defined



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1041

def img_link(node, src, content)
  if (node.attr? 'link') && ((href_attr_val = node.attr 'link') != 'self' || (href_attr_val = src))
    if (link_preview_value = bool_data_attr(node, :link_preview))
      data_preview_attr = %( data-preview-link="#{link_preview_value unless link_preview_value == true}")
    end
    return %(<a class="image" href="#{href_attr_val}"#{(append_link_constraint_attrs node).join}#{data_preview_attr}>#{content}</a>)
  end

  content
end

#img_tag(node, target, html_attrs) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1023

def img_tag(node, target, html_attrs)
  if ((node.attr? 'format', 'svg') || (target.include? '.svg')) && node.document.safe < ::Asciidoctor::SafeMode::SECURE
    if node.option? 'inline'
      img = (html5_converter(node).read_svg_contents node, target) || %(<span class="alt">#{node.alt}</span>)
    elsif node.option? 'interactive'
      fallback = node.attr?('fallback') ? %(<img src="#{node.image_uri node.attr 'fallback'}" alt="#{encode_attribute_value node.alt}"#{html_attrs}>) : %(<span class="alt">#{node.alt}</span>)
      img = %(<object type="image/svg+xml" data="#{src = node.image_uri target}"#{html_attrs}>#{fallback}</object>)
    else
      img = %(<img src="#{src = node.image_uri target}" alt="#{encode_attribute_value node.alt}"#{html_attrs}>)
    end
  else
    img = %(<img src="#{src = node.image_uri target}" alt="#{encode_attribute_value node.alt}"#{html_attrs}>)
  end

  [img, src]
end

#inline_image_content(node) ⇒ Object

Builds the inner markup of an inline image (without its surrounding span).



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# File 'lib/asciidoctor_revealjs/converter.rb', line 973

def inline_image_content(node)
  target = node.target
  if (node.type || 'image') == 'icon'
    if (icons = node.document.attr 'icons') == 'font'
      i_class_attr_val = %(#{node.attr(:set, 'fa')} fa-#{target})
      i_class_attr_val = %(#{i_class_attr_val} fa-#{node.attr 'size'}) if node.attr? 'size'
      if node.attr? 'flip'
        i_class_attr_val = %(#{i_class_attr_val} fa-flip-#{node.attr 'flip'})
      elsif node.attr? 'rotate'
        i_class_attr_val = %(#{i_class_attr_val} fa-rotate-#{node.attr 'rotate'})
      end
      attrs = node.attr?('title') ? %( title="#{node.attr 'title'}") : ''
      img = %(<i class="#{i_class_attr_val}"#{attrs}></i>)
    elsif icons
      attrs = node.attr?('width') ? %( width="#{node.attr 'width'}") : ''
      attrs = %(#{attrs} height="#{node.attr 'height'}") if node.attr? 'height'
      attrs = %(#{attrs} title="#{node.attr 'title'}") if node.attr? 'title'
      img = %(<img src="#{src = node.icon_uri target}" alt="#{encode_attribute_value node.alt}"#{attrs}>)
    else
      img = %([#{node.alt}&#93;)
    end
  else
    html_attrs = node.attr?('width') ? %( width="#{node.attr 'width'}") : ''
    html_attrs = %(#{html_attrs} height="#{node.attr 'height'}") if node.attr? 'height'
    html_attrs = %(#{html_attrs} title="#{node.attr 'title'}") if node.attr? 'title'
    img, src = img_tag(node, target, html_attrs)
  end
  img_link(node, src, img)
end

#inline_text_container(node, content = nil) ⇒ String

Wrap an inline text in a element if the node contains a role, an id or data- attributes.

Parameters:

  • node (Asciidoctor::AbstractNode) —

    the node being converted.

  • content (#to_s) (defaults to: nil) —

    the content; nil to call the block. (default: nil).

Returns:

  • (String) —

    the content or the content wrapped in a element as string



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1215

def inline_text_container(node, content = nil)
  data_attrs = data_attrs(node.attributes)
  classes = [node.role, ('fragment' if (node.option? :step) || (node.attr? 'step') || (node.roles.include? 'step'))].compact
  if !node.roles.empty? || !data_attrs.empty? || !node.id.nil?
    %(<span#{attributes({ id: node.id, class: classes }.merge(data_attrs))}>#{content || (yield if block_given?)}</span>)
  else
    content || (yield if block_given?)
  end
end

#resolve_content(node) ⇒ Object

Between delimiters (--) is code taken from asciidoctor-bespoke 1.0.0.alpha.1 Licensed under MIT, Copyright (C) 2015-2016 Dan Allen and the Asciidoctor Project

Retrieve the converted content, wrap it in a <p> element if the content_model equals :simple and return the result.

Returns the block content as a String, wrapped inside a <p> element if the content_model equals :simple.



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1060

def resolve_content(node)
  node.content_model == :simple ? %(<p>#{node.content}</p>) : node.content
end

#section_level(sec) ⇒ Integer

Returns corrected section level.

Parameters:

  • sec (Asciidoctor::Section) —

    the section node.

Returns:

  • (Integer) 


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# File 'lib/asciidoctor_revealjs/converter.rb', line 1231

def section_level(sec)
  sec.level.zero? && sec.special ? 1 : sec.level
end

#section_title(sec) ⇒ String

Returns the captioned section's title, optionally numbered.

Parameters:

  • sec (Asciidoctor::Section) —

    the section node.

Returns:

  • (String) 


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# File 'lib/asciidoctor_revealjs/converter.rb', line 1241

def section_title(sec)
  sectnumlevels = sec.document.attr(:sectnumlevels, DEFAULT_SECTNUMLEVELS).to_i

  if sec.numbered && !sec.caption && sec.level <= sectnumlevels
    [sec.sectnum, sec.captioned_title].join(' ')
  else
    sec.captioned_title
  end
end

#slice_text(node, str, active = nil) ⇒ Object 



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# File 'lib/asciidoctor_revealjs/converter.rb', line 1251

def slice_text(node, str, active = nil)
  if (active || (active.nil? && (node.option? :slice))) && (str.include? '  ')
    (str.split SLICE_HINT_RX).map { |line| %(<span class="line">#{line}</span>) }.join '\n'
  else
    str
  end
end

#step?(node) ⇒ Boolean

Whether the node should carry the reveal.js fragment class because it is part of a step. Variant used by most block elements.

Returns:

  • (Boolean) 


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# File 'lib/asciidoctor_revealjs/converter.rb', line 1164

def step?(node)
  (node.option? :step) || (node.attr? 'step')
end

#step_or_role?(node) ⇒ Boolean

Same as #step? but also honours the step role. Used by the list-like elements (colist, olist, ulist, sidebar, stem, video).

Returns:

  • (Boolean) 


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# File 'lib/asciidoctor_revealjs/converter.rb', line 1170

def step_or_role?(node)
  (node.option? :step) || (node.has_role? 'step') || (node.attr? 'step')
end