88 lines
2.2 KiB
Ruby
88 lines
2.2 KiB
Ruby
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require 'mixin/instance_wrapper'
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class Sequencer
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class Units
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class Attributes
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include ::Mixin::InstanceWrapper
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wrap :@attributes
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# Initializes the lifespan store for the attributes
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# of the given Units declarations.
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#
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# @param [Array<Hash{Symbol => Array<:Symbol>}>] declarations the list of Unit declarations.
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#
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# @example
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# declarations = [{uses: [:attribute1, ...], provides: [:result], ...}]
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# attributes = Sequencer::Units::Attributes(declarations)
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#
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# @return [nil]
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def initialize(declarations)
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@declarations = declarations
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initialize_attributes
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initialize_lifespan
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end
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# Lists all `provides` declarations of the Units the instance was initialized with.
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#
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# @example
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# attributes.provided
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# # => [:result, ...]
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#
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# @return [Array<Symbol>] the list of all `provides` declarations
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def provided
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select do |_attribute, instance|
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instance.will_be_provided?
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end.keys
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end
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# Lists all `uses` declarations of the Units the instance was initialized with.
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#
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# @example
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# attributes.used
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# # => [:attribute1, ...]
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#
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# @return [Array<Symbol>] the list of all `uses` declarations
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def used
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select do |_attribute, instance|
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instance.will_be_used?
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end.keys
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end
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# Checks if the given attribute is known in the list of Unit declarations.
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#
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# @example
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# attributes.known?(:attribute2)
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# # => false
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#
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# @return [Boolean]
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def known?(attribute)
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key?(attribute)
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end
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private
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def initialize_attributes
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@attributes = Hash.new do |hash, key|
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hash[key] = Sequencer::Units::Attribute.new
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end
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end
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def initialize_lifespan
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@declarations.each_with_index do |unit, index|
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unit[:uses].try(:each) do |attribute|
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self[attribute].to = index
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end
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unit[:provides].try(:each) do |attribute|
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next if self[attribute].will_be_provided?
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self[attribute].from = index
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end
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end
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end
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end
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end
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end
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