Class: Fable::Pointer

Inherits:
Object
  • Object
show all
Defined in:
lib/fable/pointer.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(container, index) ⇒ Pointer

Returns a new instance of Pointer.



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# File 'lib/fable/pointer.rb', line 13

def initialize(container, index)
  self.container = container
  self.index = index
end

Instance Attribute Details

#container ⇒ Object

Returns the value of attribute container.



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# File 'lib/fable/pointer.rb', line 3

def container
  @container
end

#index ⇒ Object

Returns the value of attribute index.



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# File 'lib/fable/pointer.rb', line 3

def index
  @index
end

Class Method Details

.null_pointer ⇒ Object 



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# File 'lib/fable/pointer.rb', line 9

def self.null_pointer
  self.new(nil, -1)
end

.start_of(container) ⇒ Object 



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# File 'lib/fable/pointer.rb', line 5

def self.start_of(container)
  self.new(container, 0)
end

Instance Method Details

#clone ⇒ Object 



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# File 'lib/fable/pointer.rb', line 25

def clone
  self.class.new(self.container, self.index)
end

#null_pointer? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/fable/pointer.rb', line 29

def null_pointer?
  container.nil?
end

#path ⇒ Object 



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# File 'lib/fable/pointer.rb', line 33

def path
  return nil if null_pointer?
  if index > 0
    return container.path.path_by_appending_component(index)
  else
    return container.path
  end
end

#resolve! ⇒ Object 



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# File 'lib/fable/pointer.rb', line 18

def resolve!
  return container if index < 0
  return nil if container.nil?
  return container if container.content.empty?
  return container.content[index]
end