Class: Argo::ImmutableKeywordStruct

Inherits:
Object
  • Object
show all
Defined in:
lib/argo/immutable_keyword_struct.rb

Class Method Summary collapse

Class Method Details

.new(default_parameters, &block) ⇒ Object

Disable these metrics here as gnarly metaprogramming is inherently ugly and splitting it up won’t help much.

rubocop:disable Metrics/AbcSize rubocop:disable Metrics/MethodLength



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# File 'lib/argo/immutable_keyword_struct.rb', line 8

def self.new(default_parameters, &block)
  Class.new do
    define_method :initialize do |**kwargs|
      unknown_keys = kwargs.keys - __defaults__.keys
      if unknown_keys.any?
        raise ArgumentError, "unknown keyword: #{unknown_keys.first}"
      end
      __defaults__.each do |key, default|
        instance_variable_set("@#{key}", kwargs.fetch(key, default).freeze)
      end
    end

    attr_reader(*default_parameters.keys)

    class_eval(&block) if block

  private

    define_method :__defaults__ do
      default_parameters
    end
  end
end