Class: TypeStruct

Inherits:
Object
  • Object
show all
Defined in:
lib/type_struct.rb,
lib/type_struct/version.rb

Defined Under Namespace

Classes: NoMemberError

Constant Summary collapse

VERSION = 
"0.1.0"

Class Method Summary collapse

Class Method Details

.new(**args) ⇒ Object 



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# File 'lib/type_struct.rb', line 8

def new(**args)
  Class.new do
    attr_accessor *args.keys
    const_set :MEMBERS, args

    class << self
      def members
        const_get(:MEMBERS)
      end

      def type(k)
        members[k]
      end

      def valid?(k, v)
        type(k) === v
      end
    end

    def initialize(**arg)
      self.class.members.each do |k, _|
        self[k] = arg[k]
      end
    end

    def []=(k, v)
      raise TypeStruct::NoMemberError unless respond_to?(k)
      unless self.class.valid?(k, v)
        raise TypeError, "expect #{self.class.type(k)} got #{v.class}"
      end
      __send__("#{k}=", v)
    end

    def [](k)
      raise TypeStruct::NoMemberError unless respond_to?(k)
      __send__(k)
    end

    def inspect
      m = to_h.map do |k, v|
        "#{k}=#{v.inspect}"
      end
      "#<#{self.class.to_s} #{m.join(', ')}>"
    end

    def to_h
      m = {}
      self.class.members.each do |k, _|
        m[k] = self[k]
      end
      m
    end
    alias to_hash to_h
  end
end