# Gemfile

gem 'gherkin-ruby'

class MyVisitor
  def visit(ast)
    ast.accept(self)
  end

  def visit_Feature(feature)
    # Do something nasty with the feature
    # Set whatever state you want:
    #   @current_feature = feature
    # etc etc
    # And keep visiting its children:

    feature.each { |scenario| scenario.accept(self) }
  end

  def visit_Scenario(scenario)
    # Do something nasty with the scenario
    # Set whatever state you want:
    #   @current_scenario = scenario
    # etc etc
    # And keep visiting its children:

    scenario.each { |step| step.accept(self) }
  end

  def visit_Background(background)
    # Do something nasty with the background
    # And keep visiting its children:

    background.each { |step| step.accept(self) }
  end

  def visit_Tag(tag)
    # Do something nasty with the tag
  end

  def visit_Step(step)
    # Finally, print the step name.
    puts "STEP: #{step.name}"
  end
end

ast = Gherkin.parse(File.read('some.feature'))
visitor = MyVisitor.new
visitor.visit(ast)