class Cucumber::Ast::Feature

def accept(visitor)
  visitor.visit_comment(@comment)
  visitor.visit_tags(@tags)
  visitor.visit_feature_name(@name)
  visitor.visit_background(@background) if @background
  @feature_elements.each do |feature_element|
    visitor.visit_feature_element(feature_element)
  end
end

def accept_hook?(hook)
  @tags.accept_hook?(hook)
end

def backtrace_line(step_name, line)
  "#{file_colon_line(line)}:in `#{step_name}'"
end

def file_colon_line(line)
  "#{@file}:#{line}"
end

def initialize(background, comment, tags, name, feature_elements)
  @background, @comment, @tags, @name, @feature_elements = background, comment, tags, name, feature_elements
  background.feature = self if background
  @feature_elements.each do |feature_element|
    feature_element.feature = self
  end
end

def next_feature_element(feature_element, &proc)
  index = @feature_elements.index(feature_element)
  next_one = @feature_elements[index+1]
  proc.call(next_one) if next_one
end

def to_sexp
  sexp = [:feature, @file, @name]
  comment = @comment.to_sexp
  sexp += [comment] if comment
  tags = @tags.to_sexp
  sexp += tags if tags.any?
  sexp += [@background.to_sexp] if @background
  sexp += @feature_elements.map{|fe| fe.to_sexp}
  sexp
end