module Kramdown::Converter::MathEngine::Mathjax

def self.preview_string(converter, el, opts)
  preview = converter.options[:math_engine_opts][:preview]
  return '' unless preview
  preview = (preview == true ? converter.escape_html(el.value) : preview.to_s)
  preview_as_code = converter.options[:math_engine_opts][:preview_as_code]
  if el.options[:category] == :block
    if preview_as_code
      converter.format_as_block_html('pre', {'class' => 'MathJax_Preview'},
                                     converter.format_as_span_html('code', {}, preview),
                                     opts[:indent])
    else
      converter.format_as_block_html('div', {'class' => 'MathJax_Preview'}, preview,
                                     opts[:indent])
    end
  else
    converter.format_as_span_html(preview_as_code ? 'code' : 'span',
                                  {'class' => 'MathJax_Preview'}, preview)
  end
end