Contents

module Qrb
  #
  # Abstract class for Q type (generators).
  #
  class Type

    def initialize(name)
      unless name.nil? or name.is_a?(String)
        raise ArgumentError, "String expected for type name, got `#{name}`"
      end
      @name = name
    end

    def name
      @name || default_name
    end

    def name=(n)
      raise Error, "Name already set to `#{@name}`" unless @name.nil?
      @name = n
    end

    def to_s
      name.to_s
    end

    # Check if `value` belongs to this type. Returns true if it's the case,
    # false otherwise.
    #
    # For belonging to the type, `value` MUST be a valid representation, not
    # an 'approximation' or some 'similar' representation. In particular,
    # returning true means that no dressing is required for using `value` as a
    # proper one. Similarly, the method MUST always return true on a value
    # directly obtained through `dress`.
    #
    def include?(value)
      raise NotImplementedError, "Missing #{self.class.name}#include?"
    end

    def dress(*args)
      raise NotImplementedError, "Missing #{self.class.name}#dress"
    end

  protected

    def set_equal?(s1, s2)
      s1.size == s2.size and (s1-s2).empty?
    end

    def set_hash(arg)
      arg.map(&:hash).reduce(:^)
    end

  end # class Type
end # module Qrb
require_relative 'type/any_type'
require_relative 'type/builtin_type'
require_relative 'type/union_type'
require_relative 'type/sub_type'
require_relative 'type/seq_type'
require_relative 'type/set_type'
require_relative 'type/tuple_type'
require_relative 'type/relation_type'
require_relative 'type/ad_type'

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
qrb-0.3.0	lib/qrb/type.rb