Ruby 如何展开哈希表并连接其值

Question

我有下表的 yaml 格式:

:first_directory:
 :component1:
  - component1.c
  - component1.h
 :component2:
  :component2_A:
   :src:
    - component2_A.c
   :inc:
    - component2_A.h

当我打印哈希的内容时，我得到:

{:first_directory=>{:component1=>["component1.c", "component1.h"], :component2=>{:component2_A=>{:src=>["component2_A.c"], :inc=>["component2_A.h"]}}}}

现在我希望能够创建字符串来连接哈希层次结构的所有可能值，并使用字符拆分它。我想要生成的字符串如下所示:

first_directory/component1/component1.c
first_directory/component1/component1.h
first_directory/component2/component2_A/src/component2_A.c
first_directory/component2/component2_A/inc/component2_A.h

实现这一目标的最干净、最好的方法是什么？

Answer 1

这种方法应该最有效:

def print_hash(hash_node, prev_string=nil)
  if hash_node.class == Array
    hash_node.each {|element| puts "#{prev_string}#{element}"}
  else # it is an inner hash
    hash_node.each do |key, value|
      print_hash(value, "#{prev_string}#{key}/")
    end
  end
end

print_hash(content_as_a_hash)

测试运行:

content_as_a_hash = {:first_directory=>{:component1=>["component1.c", "component1.h"], :component2=>{:component2_A=>{:src=>["component2_A.c"], :inc=>["component2_A.h"]}}}}

print_hash(content_as_a_hash)    

结果:

first_directory/component1/component1.c
first_directory/component1/component1.h
first_directory/component2/component2_A/src/component2_A.c
first_directory/component2/component2_A/inc/component2_A.h