Module: Anise::Attribute

Defined in:
lib/anise/attribute.rb

Overview

Annotated Attributes

This framework modifies the major attr_* methods to allow easy addition of annotations. It modifies the built in attribute methods (attr, attr_reader, attr_writer and attr_accessor), to allow annotations to be added to them directly rather than requiring a separate #ann statement.

require 'anise/attribute'

class X
  include Anise::Attribute

  attr :a, :valid => lambda{ |x| x.is_a?(Integer) }
end

See annotation.rb for more information.

NOTE: This library was designed to be backward compatible with the standard versions of the same methods.

Defined Under Namespace

Modules: Aid

Class Method Summary collapse

Class Method Details

.annotatable_attribute_method(base, attr_method_name) ⇒ Object 



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# File 'lib/anise/attribute.rb', line 42

def self.annotatable_attribute_method(base, attr_method_name)
  base.module_eval do
    define_method(attr_method_name) do |*args|
      args.flatten!

      harg={}; while args.last.is_a?(Hash)
        harg.update(args.pop)
      end

      raise ArgumentError if args.empty? and harg.empty?

      if args.empty?  # hash mode
        harg.each { |a,h| __send__(attr_method_name,a,h) }
      else
        klass = harg[:class] = args.pop if args.last.is_a?(Class)

        #attr_method.call(*args)
        super(*args)

        args.each{|a| ann(a.to_sym,harg)}

        instance_attributes!.concat(args)  #merge!

        # Use this callback to customize for your needs.
        if respond_to?(:attr_callback)
          attr_callback(self, args, harg)
        end

        # return the names of the attributes created
        return args
      end
    end
  end
end

.included(base) ⇒ Object 



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# File 'lib/anise/attribute.rb', line 30

def self.included(base)
  base.send(:include, Annotation) #.append_features(base)
  base.extend Aid

  #inheritor :instance_attributes, [], :|
  base_class = (class << base; self; end)
  base_class.attribute_methods.each do |attr_method|
    annotatable_attribute_method(base_class, attr_method)
  end
end