class Tamiyo::Value

Public Class Methods

new(*fields, &block) click to toggle source
# File lib/tamiyo/value.rb, line 7
def self.new(*fields, &block)
  Class.new do
    attr_reader(:hash, *fields)

    define_method(:initialize) do |*values|
      raise ArgumentError.new("wrong number of arguments, #{values.size} for #{fields.size}") if fields.size != values.size

      fields.zip(values) do |field, value|
        instance_variable_set(:"@#{field}", value)
      end

      @hash = self.class.hash ^ values.hash

      freeze
    end

    const_set :VALUE_ATTRS, fields

    def self.with(hash)
      unexpected_keys = hash.keys - self::VALUE_ATTRS
      if unexpected_keys.any?
        raise ArgumentError.new("Unexpected hash keys: #{unexpected_keys}")
      end

      new(*hash.values_at(*self::VALUE_ATTRS))
    end

    def ==(other)
      eql?(other)
    end

    def eql?(other)
      self.class == other.class && values == other.values
    end

    def values
      self.class::VALUE_ATTRS.map { |field| send(field) }
    end

    class_eval &block if block_given?
  end
end
with(hash) click to toggle source
# File lib/tamiyo/value.rb, line 25
def self.with(hash)
  unexpected_keys = hash.keys - self::VALUE_ATTRS
  if unexpected_keys.any?
    raise ArgumentError.new("Unexpected hash keys: #{unexpected_keys}")
  end

  new(*hash.values_at(*self::VALUE_ATTRS))
end

Public Instance Methods

==(other) click to toggle source
# File lib/tamiyo/value.rb, line 34
def ==(other)
  eql?(other)
end
eql?(other) click to toggle source
# File lib/tamiyo/value.rb, line 38
def eql?(other)
  self.class == other.class && values == other.values
end
values() click to toggle source
# File lib/tamiyo/value.rb, line 42
def values
  self.class::VALUE_ATTRS.map { |field| send(field) }
end