class Rouge::Lexer

def as_lexer(val)
  return as_lexer(val.last) if val.is_a?(Array)
  return val.new(@options) if val.is_a?(Class) && val < Lexer
  case val
  when Lexer
    val
  when String
    lexer_class = Lexer.find(val)
    lexer_class && lexer_class.new(@options)
  end
end