Module: Lite::Memoize::Alias

Defined in:
lib/lite/memoize/alias.rb

Defined Under Namespace

Modules: InstanceMethods Classes: MemoizedMethod

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.escape_punctuation(string) ⇒ Object 



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# File 'lib/lite/memoize/alias.rb', line 74

def escape_punctuation(string)
  string = string.is_a?(String) ? string.dup : string.to_s
  return string unless string.end_with?('?', '!')

  string.sub!(/\?\Z/, '_query') || string.sub!(/!\Z/, '_bang') || string
end

.extended(extender) ⇒ Object 



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# File 'lib/lite/memoize/alias.rb', line 44

def extended(extender)
  Lite::Memoize::Alias.memoist_eval(extender) do
    return if singleton_class.method_defined?(:memoized_methods)

    def self.memoized_methods
      @_memoized_methods ||= []
    end
  end
end

.memoist_eval(klass, *args, &block) ⇒ Object 



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# File 'lib/lite/memoize/alias.rb', line 81

def memoist_eval(klass, *args, &block)
  return klass.class_eval(*args, &block) if klass.respond_to?(:class_eval)

  klass.singleton_class.class_eval(*args, &block)
end

.memoized_ivar_for(method_name, as = nil) ⇒ Object 



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# File 'lib/lite/memoize/alias.rb', line 54

def memoized_ivar_for(method_name, as = nil)
  "@#{memoized_prefix(as)}_#{escape_punctuation(method_name)}"
end

.memoized_prefix(as = nil) ⇒ Object 



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# File 'lib/lite/memoize/alias.rb', line 62

def memoized_prefix(as = nil)
  return '_memoized' unless as

  "_memoized_#{as}"
end

.unmemoized_method_for(method_name, as = nil) ⇒ Object 



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# File 'lib/lite/memoize/alias.rb', line 58

def unmemoized_method_for(method_name, as = nil)
  "#{unmemoized_prefix(as)}_#{method_name}".to_sym
end

.unmemoized_prefix(as = nil) ⇒ Object 



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# File 'lib/lite/memoize/alias.rb', line 68

def unmemoized_prefix(as = nil)
  return '_unmemoized' unless as

  "_unmemoized_#{as}"
end

Instance Method Details

#all_memoized_structs ⇒ Object 



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# File 'lib/lite/memoize/alias.rb', line 89

def all_memoized_structs
  @all_memoized_structs ||= begin
    structs = memoized_methods.dup

    ancestors.grep(Lite::Memoize::Alias).each do |ancestor|
      ancestor.memoized_methods.each do |m|
        next if structs.any? { |am| am.memoized_method == m.memoized_method }

        structs << m
      end
    end

    structs
  end
end

#clear_structs ⇒ Object 



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# File 'lib/lite/memoize/alias.rb', line 105

def clear_structs
  @all_memoized_structs = nil
end

#memoize(*method_names) ⇒ Object

rubocop:disable Metrics/AbcSize, Metrics/BlockLength, Metrics/CyclomaticComplexity rubocop:disable Metrics/MethodLength, Metrics/PerceivedComplexity



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# File 'lib/lite/memoize/alias.rb', line 111

def memoize(*method_names)
  as = method_names.pop[:as] if method_names.last.is_a?(Hash)

  method_names.each do |method_name|
    unmemoized_method = Lite::Memoize::Alias.unmemoized_method_for(method_name, as)
    memoized_ivar = Lite::Memoize::Alias.memoized_ivar_for(method_name, as)

    Lite::Memoize::Alias.memoist_eval(self) do
      include InstanceMethods

      # rubocop:disable Lint/NonLocalExitFromIterator
      if method_defined?(unmemoized_method)
        warn "Already memoized #{method_name}"
        return
      end
      # rubocop:enable Lint/NonLocalExitFromIterator

      alias_method unmemoized_method, method_name

      mm = MemoizedMethod.new(method_name, memoized_ivar, instance_method(method_name).arity)
      memoized_methods << mm

      if mm.arity.zero?
        module_eval <<-RUBY, __FILE__, __LINE__ + 1
          def #{method_name}(reload: false)
            skip_cache = reload || !instance_variable_defined?("#{memoized_ivar}")
            set_cache = skip_cache && !frozen?

            if skip_cache
              value = #{unmemoized_method}
            else
              value = #{memoized_ivar}
            end

            if set_cache
              #{memoized_ivar} = value
            end

            value
          end
        RUBY
      else
        module_eval <<-RUBY, __FILE__, __LINE__ + 1
          def #{method_name}(*args, reload: false)
            skip_cache = reload || !(instance_variable_defined?(#{memoized_ivar.inspect}) && #{memoized_ivar} && #{memoized_ivar}.key?(args))
            set_cache = skip_cache && !frozen?

            if skip_cache
              value = #{unmemoized_method}(*args)
            else
              value = #{memoized_ivar}[args]
            end

            if set_cache
              #{memoized_ivar} ||= {}
              #{memoized_ivar}[args] = value
            end

            value
          end
        RUBY
      end

      if private_method_defined?(unmemoized_method)
        private method_name
      elsif protected_method_defined?(unmemoized_method)
        protected method_name
      end
    end
  end

  method_names.size == 1 ? method_names.first : method_names
end