48 lines
851 B
Ruby
48 lines
851 B
Ruby
# frozen_string_literal: true
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module Obredux
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UNDEFINED = Object.new.freeze
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class Action; end
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class Init < Action; end
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class Store
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attr_reader :reducer_klass, :state
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def initialize(reducer_klass)
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@reducer_klass = reducer_klass
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@state = UNDEFINED
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dispatch Init.new
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end
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def dispatch(action)
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@state = reducer_klass.new(state, action).call
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end
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end
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class Reducer
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def initialize(state, action)
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@state = state
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@action = action
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end
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def call
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@state = initial_state if state.equal? UNDEFINED
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@state ||= {}.freeze
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reduce
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end
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private
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attr_reader :state, :action
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def initial_state
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raise NotImplementedError, "#{self.class}#initial_state"
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end
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def reduce
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raise NotImplementedError, "#{self.class}#reduce"
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end
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end
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end
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