Class: Decider::View::Module

Inherits:
Module
  • Object
show all
Defined in:
lib/decider/view.rb

Defined Under Namespace

Classes: Evolve

Constant Summary collapse

EVOLVE_FALLBACK = 
proc { [nil, proc { state }] }

Instance Method Summary collapse

Constructor Details

#initialize(initial_state:, evolutions:) ⇒ Module

Returns a new instance of Module.



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# File 'lib/decider/view.rb', line 16

def initialize(initial_state:, evolutions:)
  case initial_state
  in Proc
    define_method(:initial_state) do
      initial_state.call
    end
  else
    define_method(:initial_state) do
      initial_state
    end
  end

  define_method(:evolve) do |*args|
    if args.empty?
      ->(state, event) { evolve(state, event) }
    else
      context = Evolve.build(*args)

      evolutions.find(EVOLVE_FALLBACK) do |args, _|
        case args
        in [Proc => fn]
          context.instance_exec(&fn)
        in [etype]
          context_event = context.event
          context_event in ^etype
        in [stype, etype]
          context_state = context.state
          context_event = context.event
          [context_state, context_event] in [^stype, ^etype]
        else
          false
        end
      end => [_, handler]

      context.instance_exec(&handler)
    end
  end

  define_method(:lmap_on_event) do |fn|
    Decider::View.lmap_on_event(fn, self)
  end

  define_method(:lmap_on_state) do |fn|
    Decider::View.lmap_on_state(fn, self)
  end

  define_method(:rmap_on_state) do |fn|
    Decider::View.rmap_on_state(fn, self)
  end

  define_method(:dimap_on_state) do |fl:, fr:|
    Decider::View.dimap_on_state(fl, fr, self)
  end

  define_method(:many) do
    Decider::View.many(self)
  end
end