Module: PowerStruct

Defined in:
lib/power_struct.rb,
lib/power_struct/version.rb

Defined Under Namespace

Classes: Base

Constant Summary collapse

ArgumentError = 
Class.new(::ArgumentError)
VERSION = 
"0.1.0"

Class Method Summary collapse

Class Method Details

.new(*mandatory_attributes, **defaults, &block) ⇒ Object

Raises:



6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
 
# File 'lib/power_struct.rb', line 6

def self.new(*mandatory_attributes, **defaults, &block)
  raise ArgumentError, "pass attribute names as symbols" unless \
    mandatory_attributes.all? { |attribute| attribute.is_a?(Symbol) }

  Class.new(Base) do
    class << self
      attr_reader :mandatory_attributes, :attribute_defaults
    end
    @mandatory_attributes = mandatory_attributes
    @attribute_defaults = defaults

    def initialize(*flat_arguments, **arguments)
      raise ArgumentError, "pass parameters as hash arguments" if flat_arguments.any?
      unless (self.class.mandatory_attributes - arguments.keys).empty?
        raise ArgumentError, "missing argument(s) " +
          (self.class.mandatory_attributes - arguments.keys).map(&:inspect).join(", ")
      end
      unless (
          arguments.keys - self.class.mandatory_attributes - self.class.attribute_defaults.keys
        ).none?
        raise ArgumentError, "excess argument(s) " +
          (arguments.keys - self.class.mandatory_attributes - self.class.attribute_defaults.keys)
            .map(&:inspect).join(", ")
      end

      self.class.attribute_defaults.each do |attribute, default|
        self.public_send("#{attribute}=", default)
      end

      arguments.each do |attribute, value|
        self.public_send("#{attribute}=", value)
      end
    end

    attr_accessor(*mandatory_attributes, *defaults.keys)

    class_eval(&block) if block
  end
end