module ObjectDiffModule
    attr_reader :objectDiffArray
    # Standart hata cümlesi oluşturuluyor.
    OBJECTDIFF_ERRORSTR = "Objects are not have same class type."

    def isPropertiesEqual(firstObject, secondObject)
        # Yeni işlem için objectDiffArray bilgisi temizleniyor...
        @objectDiffArray = Array.new()

        # Her iki nesnenin property'leri alınıyor. Varsa @objectDiffArray değerleri temizleniyor.<br />
        firstVarList = firstObject.instance_variables
        firstVarList.delete("@objectDiffArray")
        secondVarList = secondObject.instance_variables
        secondVarList.delete("@objectDiffArray")

        # Performans amacı ile property dizilerinin eşit olup olması el ile kontrol ediliyor.
        raise RuntimeError, OBJECTDIFF_ERRORSTR if firstVarList.size != secondVarList.size
        firstVarList.size.times {
            variable = firstVarList.pop
            raise RuntimeError, OBJECTDIFF_ERRORSTR if variable != secondVarList.pop
            firstValue = firstObject.instance_eval(variable)
            secondValue = secondObject.instance_eval(variable)
            @objectDiffArray.push( [variable, firstValue, secondValue] ) if  firstValue != secondValue
        }
        return @objectDiffArray
    end

    def ===(secondObject)
    return true if self == secondObject
    isPropertiesEqual(self, secondObject).empty?
    end
end

class ObjectDiff
    include ObjectDiffModule
    @@objectDiff = nil

    private_class_method :new

    def initialize() end

    def ObjectDiff.isEqual(firstObject, secondObject)
        return true if firstObject == secondObject
        @@objectDiff = new unless @@objectDiff
        @@objectDiff.isPropertiesEqual(firstObject, secondObject).empty?
    end

    def ObjectDiff.objectDiffArray
        @@objectDiff.objectDiffArray if @@objectDiff
    end
end

class SimpleClass
    include ObjectDiffModule

    attr_reader :myname, :address, :den1, :den2
    attr_writer :myname, :address

    def initialize()
        @myname = "Tankut"
        @address = "<a href="http://www.blogcu.com/uordek">http://www.blogcu.com/uordek</a>"
        @den1 = "aaaa"
        @den2 = "bbbb"
        @den3 = "aaaa"
    end

public
    def publicDene1() end
    def publicDene2() end
    def to_s()
        super.to_s
    end
private
    def privateDene1() end
    def privateDene2() end
    def privateDene3() end
end

fSimple = SimpleClass.new()
sSimple = SimpleClass.new()
sSimple.myname = "Sykai"
sSimple.address = "<a href="http://www.blogcu.com/Sykai">http://www.blogcu.com/Sykai</a>"
begin
    p fSimple === sSimple
    p fSimple.objectDiffArray
    p sSimple === fSimple
    p sSimple.objectDiffArray
    p ObjectDiff.isEqual(fSimple, sSimple)
    p ObjectDiff.objectDiffArray
rescue RuntimeError => err
    p "Bunlar farklı... " + err
end