class Asciidoctor::SyntaxHighlighter::CodeRayAdapter

def docinfo location, doc, opts
  if opts[:linkcss]
    %(<link rel="stylesheet" href="#{doc.normalize_web_path stylesheet_basename, (doc.attr 'stylesdir', ''), false}"#{opts[:self_closing_tag_slash]}>)
  else
    %(<style>
read_stylesheet}
style>)
  end
end

def docinfo? location
  @requires_stylesheet && location == :head
end

def highlight node, source, lang, opts
  @requires_stylesheet = true if (css_mode = opts[:css_mode]) == :class
  lang = lang ? (::CodeRay::Scanners[lang = lang.to_sym] && lang rescue :text) : :text
  highlighted = ::CodeRay::Duo[lang, :html,
    css: css_mode,
    line_numbers: (line_numbers = opts[:number_lines]),
    line_number_start: opts[:start_line_number],
    line_number_anchors: false,
    highlight_lines: opts[:highlight_lines],
    bold_every: false,
  ].highlight source
  if line_numbers == :table && opts[:callouts]
    [highlighted, (idx = highlighted.index CodeCellStartTagCs) ? idx + CodeCellStartTagCs.length : nil]
  else
    highlighted
  end
end

def highlight?
  library_available?
end

def initialize *args
  super
  @pre_class = 'CodeRay'
  @requires_stylesheet = nil
end

def write_stylesheet doc, to_dir
  ::File.write (::File.join to_dir, stylesheet_basename), read_stylesheet, mode: FILE_WRITE_MODE
end

def write_stylesheet? doc
  @requires_stylesheet
end