class Sequencer class Units < SimpleDelegator # Initializes the lifespan store for the attributes # of the given Units declarations. # # @param [Array Array<:Symbol>}>] declarations the list of Unit declarations. # # @example # declarations = [{uses: [:attribute1, ...], provides: [:result], ...}] # attributes = Sequencer::Units::Attributes(declarations) class Attributes < Delegator # Lists all `provides` declarations of the Units the instance was initialized with. # # @example # attributes.provided # # => [:result, ...] # # @return [Array] the list of all `provides` declarations def provided select do |_attribute, instance| instance.will_be_provided? end.keys end # Lists all `uses` declarations of the Units the instance was initialized with. # # @example # attributes.used # # => [:attribute1, ...] # # @return [Array] the list of all `uses` declarations def used select do |_attribute, instance| instance.will_be_used? end.keys end # Checks if the given attribute is known in the list of Unit declarations. # # @example # attributes.known?(:attribute2) # # => false # # @return [Boolean] def known?(attribute) key?(attribute) end def __getobj__ @attributes end def __setobj__(declarations) @attributes ||= begin # rubocop:disable Naming/MemoizedInstanceVariableName attributes = Hash.new do |hash, key| hash[key] = Sequencer::Units::Attribute.new end attributes.tap do |result| declarations.each_with_index do |unit, index| unit[:uses].try(:each) do |attribute| result[attribute].to = index end unit[:provides].try(:each) do |attribute| next if result[attribute].will_be_provided? result[attribute].from = index end end end end end end end end