class Cucumber::Ast::StepCollection

def +(step_invocations)
  dup(step_invocations)
end

def accept(visitor)
  return if Cucumber.wants_to_quit
  @steps.each do |step|
    visitor.visit_step(step)
  end
end

def dup(step_invocations = [])
  StepCollection.new(@steps + step_invocations)
end

def each(&proc)
  @steps.each(&proc)
end

def empty?
  @steps.empty?
end

def exception
  @exception ||= ((failed = @steps.detect {|step| step.exception}) && failed.exception)
end

def failed?
  status == :failed
end

def initialize(steps)
  @steps = steps
  @steps.each{|step| step.step_collection = self}
end

def inspect
  @steps.map { |s| [s.class, s.object_id] }.join(', ')
end

def length
  @steps.length
end

def max_line_length(feature_element)
  lengths = (@steps + [feature_element]).map{|e| e.text_length}
  lengths.max
end

def passed?
  status == :passed
end

def previous_step(step)
  i = @steps.index(step) || -1
  @steps[i-1]
end

def skip_invoke!
  @steps.each{|step_invocation| step_invocation.skip_invoke!}
end

def status
  @steps.each{|step_invocation| return step_invocation.status if step_invocation.status != :passed}
  :passed
end

def step_invocations(background = false)
  StepCollection.new(@steps.map{ |step|
    i = step.step_invocation
    i.background = background
    i
  })
end

def step_invocations_from_cells(cells)
  @steps.map{|step| step.step_invocation_from_cells(cells)}
end

def to_sexp
  @steps.map{|step| step.to_sexp}
end