class Asciidoctor::PreprocessorReader

def skip_front_matter! data, increment_linenos = true
  return unless (delim = data[0]) == '---'
  original_data = data.drop 0
  data.shift
  front_matter = []
  @lineno += 1 if increment_linenos
  until (eof = data.empty?) || data[0] == delim
    front_matter << data.shift
    @lineno += 1 if increment_linenos
  end
  if eof
    data.unshift(*original_data)
    @lineno -= original_data.size if increment_linenos
    return
  end
  data.shift
  @lineno += 1 if increment_linenos
  front_matter
end