mjacobus / koine-attributes

      class Base

        attr_reader :attribute_name

        def initialize

          with_attribute_name('annonymous_attribute_name')

        end

        def coerce(value)

          return coerce_nil if value.nil?

          coerce_not_nil(value)

        end

        def default_value

          @default_value.respond_to?(:call) &&

            @default_value.call ||

            @default_value

        end

        def with_nil_value(value = nil, &block)

          @nil_value_set = true

          @nil_value = value

          @nil_value = block if block

          self

        end

        def with_default_value(value = nil, &block)

          @default_value = value

          @default_value = block if block

          self

        end

        def with_attribute_name(name)

          @attribute_name = name

          self

        end

        private

        def coerce_nil

          if @nil_value_set

            return @nil_value.respond_to?(:call) ? @nil_value.call : @nil_value

          end

          raise_error('Cannot be nil')

        end

        def coerce_not_nil(_value)

          raise NotImplementedError

        end

        # duplicates if possible and freezes object

        def secure

          value = yield

          unless value.is_a?(::Symbol)

            value = value.dup if value.respond_to?(:dup)

          end

          value.freeze

        end

        def wrap_errors

          yield

        rescue StandardError => error

          raise_error(error)

        end

        def raise_error(message)

          raise Koine::Attributes::InvalidAttributeError.new(message, attribute_name)

        end

      end