Class: Enumerator::AutoForcedLazy

Inherits:
SimpleDelegator
  • Object
show all
Defined in:
lib/enumerator.rb

Overview

Enumerator::AutoForcedLazy is a thin wrapper around Enumerator::Lazy that automatically calls Enumerator::Lazy#force before a method call if the called method does not exist on Enumerator::Lazy but exists on Array.

Enumerator::AutoForcedLazy can be constructed from any Enumerator::Lazy with the Enumerator::Lazy#auto_force method.

(1..Float::INFINITY).lazy.auto_force.take_while { |i| i < 30 }
=> #<Enumerator::Lazy: #<Enumerator::Lazy: 1..Infinity>:take_while>

Alternatively, Enumerator::AutoForcedLazy can also be constructed from any and from any Enumerable with the Enumerable#auto_forced_lazy method.

(1..Float::INFINITY).auto_forced_lazy.take_while { |i| i < 30 }
=> #<Enumerator::Lazy: #<Enumerator::Lazy: 1..Infinity>:take_while>

It is useful for keeping lazy enumerator semantics while providing easier access to Array methods by not requiring users to explicitly call Enumerator::Lazy#force.

Constant Summary collapse

ARRAY_OBJ = 
[].freeze

Instance Method Summary collapse

Constructor Details

#initialize(lazy_enum) ⇒ AutoForcedLazy

Returns a new instance of AutoForcedLazy.



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# File 'lib/enumerator.rb', line 28

def initialize(lazy_enum)
  super(lazy_enum)
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(m, *args, &block) ⇒ Object

rubocop:disable Style/MissingRespondToMissing



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# File 'lib/enumerator.rb', line 33

def method_missing(m, *args, &block)
  if __getobj__.respond_to?(m)
    result = __getobj__.send(m, *args, &block)

    if result.is_a?(Enumerator::Lazy)
      __setobj__(result)

      self
    else
      result
    end
  elsif ARRAY_OBJ.respond_to?(m)
    __getobj__.force.send(m, *args, &block)
  else
    super
  end
end