Module: Gadgeto::Dslable::ClassMethods

Defined in:
lib/gadgeto/dslable.rb

Instance Method Summary collapse

Instance Method Details

#dslable_method(method, *args) ⇒ Object 



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# File 'lib/gadgeto/dslable.rb', line 72

def dslable_method(method, *args)
  self.instance_eval do

    stored_at = method.to_s + 's' # pluralize with ActiveSupport

    # method_params:          key, *arguments, options = {}
    # method_values_set:      i.name = name
    # method_setters_getters: def key, def arguments, def options

    method_params, method_values_set, method_accessors = [], [], []

    args.each do |arg|
      unless [String, Symbol, Hash].include? arg.class
        raise ArgumentError, 'allowed arguments are Symbols, Strings and Hashes'
      end

      method_params          << (arg.is_a?(Hash) ? arg.to_a : [arg]).flatten.join(' = ')

      arg_name = (arg.is_a?(Hash) ? arg.keys.first : arg).to_s.gsub('*', '')

      method_values_set      << arg_name
      method_accessors       << arg_name
    end

    method_params = method_params.join(', ')

    method_values_set = method_values_set.map do |p|
      'i.%s = %s' % [p, p]
    end.join(';')

    method_accessors = method_accessors.map do |p|
      "def #{p}; read_attribute(:#{p}); end;" + "def #{p}=(v); write_attribute(:#{p}, v); end;"
    end.join

    self.class_eval <<-RUBY

      #{method_accessors}

      def draw(code = nil, &block)
        i = self.class.new

        if code
          i.instance_eval code
        else
          i.instance_eval &block
        end

        @#{stored_at} = i.#{stored_at}
        return nil
      end

      def #{method.to_s}(#{method_params}, &block)
        i = self.class.new
        #{method_values_set}

        i.instance_eval &block if block

        self.#{stored_at} << i
      end

      def #{stored_at}
        @#{stored_at} ||= []
      end

      def #{stored_at}=(v)
        @#{stored_at} = v
      end

      def attributes
        @attributes ||= {}
      end

      def attributes=(a)
        @attributes = a
      end

      def read_attribute(n)
        attributes[n]
      end

      def write_attribute(n, v)
        attributes[n] = v
      end

    RUBY

  end
end