Module: EnumerableConstants

Included in:
SDL2::ARRAYORDER, SDL2::Audio::MASK, SDL2::BITMAPORDER, SDL2::EVENTACTION, SDL2::EVENTSTATE, SDL2::EVENTTYPE, SDL2::FLIP, SDL2::GLattr, SDL2::GLcontextFlag, SDL2::GLprofile, SDL2::HAT, SDL2::HINT, SDL2::Haptic::DIRECTION, SDL2::Haptic::FEATURES, SDL2::INIT, SDL2::KEYCODE, SDL2::KEYMOD, SDL2::Mouse::BUTTON, SDL2::Mouse::BUTTONMASK, SDL2::PACKEDLAYOUT, SDL2::PACKEDORDER, SDL2::PIXELFORMAT, SDL2::PIXELTYPE, SDL2::POWERSTATE, SDL2::RENDERER, SDL2::SCANCODE, SDL2::TEXTUREACCESS, SDL2::TEXTUREMODULATE, SDL2::TTF::HINTING, SDL2::TTF::STYLE, SDL2::WINDOW, SDL2::WINDOWEVENT, SDL2::WINDOWPOS
Defined in:
lib/enumerable_constants.rb

Overview

MyEnumeration.next_const_value # 6

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object

This is the method that injects the new static-scope routines.



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# File 'lib/enumerable_constants.rb', line 48

def self.included(base)
  base.module_eval do

    ##
    # Return the defined constants in a hash keyed by name.
    def self.by_name
      result = {}
      self.constants.each do |constant|
        result[constant] = self.const_get(constant)
      end
      return result
    end
    
    # Return the defined constants in a hash keyed by value.
    def self.by_value
      result = {}
      self.constants.each do |constant|
        result[self.const_get(constant)] = constant          
      end
      return result
    end
    
    # This routine returns a flattened array of alternating symbols and values.
    # The symbols are the CONSTANT names and values are the values defined by that constant.
    def self.flatten_consts
      by_name.to_a.flatten
    end

    ##
    # Get the last defined value.
    def self.last_const_value
      if self.constants.empty?
        return 0
      else
        return self.const_get(self.constants.last)
      end
    end

    ##
    # Get the next value in order.
    def self.next_const_value
      last_const_value.next
    end

    def self.const_missing(const)
      self.const_set(const, next_const_value)
    end
  end
end