Class: Depth::Traverser

Inherits:
Object
  • Object
show all
Defined in:
lib/depth/traverser.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(object, key_transformer:, next_proc:, creation_proc:) ⇒ Traverser

Returns a new instance of Traverser.



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# File 'lib/depth/traverser.rb', line 6

def initialize(object,
               key_transformer:,
               next_proc:, creation_proc:)
  @object = object
  @next_proc = next_proc
  @creation_proc = creation_proc
  @key_transformer = key_transformer
end

Instance Attribute Details

#object ⇒ Object (readonly)

Returns the value of attribute object.



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# File 'lib/depth/traverser.rb', line 4

def object
  @object
end

Instance Method Details

#array? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/depth/traverser.rb', line 15

def array?
  object.is_a?(Array)
end

#hash? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/depth/traverser.rb', line 19

def hash?
  object.is_a?(Hash)
end

#next(key_or_index) ⇒ Object 



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# File 'lib/depth/traverser.rb', line 23

def next(key_or_index)
  return Traverser.new(
    nil,
    key_transformer: key_transformer,
    next_proc: next_proc,
    creation_proc: creation_proc
  ) if object.nil?

  original_key = key_or_index
  key_or_index = key_transformer.call(object, key_or_index)
  next_object = next_proc.call(object, key_or_index, original_key)

  Traverser.new(
    next_object,
    key_transformer: key_transformer,
    next_proc: next_proc,
    creation_proc: creation_proc
  )
end

#next_or_create(key_or_index, &block) ⇒ Object 



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# File 'lib/depth/traverser.rb', line 43

def next_or_create(key_or_index, &block)
  return Traverser.new(
    nil,
    key_transformer: key_transformer,
    next_proc: next_proc,
    creation_proc: creation_proc
  ) if object.nil?

  original_key = key_or_index
  key_or_index = key_transformer.call(object, key_or_index)
  next_object = next_proc.call(object, key_or_index, original_key)
  creation_proc.call(object, key_or_index, block.call, original_key) if next_object.nil?
  Traverser.new(
    # Refetch it to allow for creation
    next_proc.call(object, key_or_index, original_key),
    key_transformer: key_transformer,
    next_proc: next_proc,
    creation_proc: creation_proc
  )
end