- open, close = ::Asciidoctor::BLOCK_MATH_DELIMITERS[@style.to_sym]
- equation = content.strip
- if (@subs.nil? || @subs.empty?) && !(attr? 'subs')
  - equation = sub_specialcharacters equation
- unless (equation.start_with? open) && (equation.end_with? close)
  - equation = %(#{open}#{equation}#{close})
%div{:id=>@id, :class=>['mathblock', role]}
  - if title?
    .title=title
  .content=equation