class Gherkin::TokenScanner

def initialize(source_or_io)
  @line_number = 0
  case(source_or_io)
  when String
    @io = StringIO.new(source_or_io)
  when StringIO, IO
    @io = source_or_io
  else
    fail ArgumentError, "Please a pass String, StringIO or IO. I got a #{source_or_io.class}"
  end
end