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Contents
require 'dry/core/constants'
require 'dry/core/errors'
module Dry
module Core
# Internal support module for class-level settings
#
# @api public
module ClassAttributes
include Constants
# Specify what attributes a class will use
#
# @example
# class ExtraClass
# extend Dry::Core::ClassAttributes
#
# defines :hello
#
# hello 'world'
# end
#
# @example with inheritance and type checking
#
# class MyClass
# extend Dry::Core::ClassAttributes
#
# defines :one, :two, type: Integer
#
# one 1
# two 2
# end
#
# class OtherClass < MyClass
# two 3
# end
#
# MyClass.one # => 1
# MyClass.two # => 2
#
# OtherClass.one # => 1
# OtherClass.two # => 3
#
# @example with dry-types
#
# class Foo
# extend Dry::Core::ClassAttributes
#
# defines :one, :two, type: Dry::Types['strict.int']
# end
#
def defines(*args, type: Object)
mod = Module.new do
args.each do |name|
define_method(name) do |value = Undefined|
ivar = "@#{name}"
if value == Undefined
if instance_variable_defined?(ivar)
instance_variable_get(ivar)
else
nil
end
else
raise InvalidClassAttributeValue.new(name, value) unless type === value
instance_variable_set(ivar, value)
end
end
end
define_method(:inherited) do |klass|
args.each { |name| klass.send(name, send(name)) }
super(klass)
end
end
extend(mod)
end
end
end
end
Version data entries
6 entries across 6 versions & 1 rubygems