ms-ati · February 8, 2019 08:42
diff --git a/example_multi_level_dsl.rb b/example_multi_level_dsl.rb
 require 'docile'

 # Family tree node, mother and father are Person values as well
 Person = Struct.new(:name, :mother, :father)

 # Recursive dsl in a mutating builder using Docile
 def person(&block)
  Docile.dsl_eval(PersonBuilder.new, &block).build
 end

 # Notice how the builder uses `person` to recurse
 class PersonBuilder
  def initialize
    @p = Person.new
  end
  
  def name(v)
    @p.name = v
  end
  
  def mother(&block)
    @p.mother = person(&block) 
  end  
  
  def father(&block)
    @p.father = person(&block) 
  end  

  def build
    @p
  end
 end

 # Example DSL usage
 p = person {
  name 'John Smith'
  mother {
    name 'Mary Smith'
  }
  father {
    name 'Tom Smith'
    mother {
      name 'Jane Smith'
    }
  }
 }

 puts p

 # Output from this example
 #
 #=> #<struct Person name="John Smith",
 #                   mother=#<struct Person name="Mary Smith", mother=nil, father=nil>,
 #                   father=#<struct Person name="Tom Smith",
 #                                          mother=#<struct Person name="Jane Smith", mother=nil, father=nil>,
 #                                          father=nil>>
 #
	require 'docile'

	# Family tree node, mother and father are Person values as well
	Person = Struct.new(:name, :mother, :father)

	# Recursive dsl in a mutating builder using Docile
	def person(&block)
	Docile.dsl_eval(PersonBuilder.new, &block).build
	end

	# Notice how the builder uses `person` to recurse
	class PersonBuilder
	def initialize
	@p = Person.new
	end

	def name(v)
	@p.name = v
	end

	def mother(&block)
	@p.mother = person(&block)
	end

	def father(&block)
	@p.father = person(&block)
	end

	def build
	@p
	end
	end

	# Example DSL usage
	p = person {
	name 'John Smith'
	mother {
	name 'Mary Smith'
	}
	father {
	name 'Tom Smith'
	mother {
	name 'Jane Smith'
	}
	}
	}

	puts p

	# Output from this example
	#
	#=> #<struct Person name="John Smith",
	# mother=#<struct Person name="Mary Smith", mother=nil, father=nil>,
	# father=#<struct Person name="Tom Smith",
	# mother=#<struct Person name="Jane Smith", mother=nil, father=nil>,
	# father=nil>>
	#