lib/slot_machine/slot.rb in slot_machine-0.1.0 vs lib/slot_machine/slot.rb in slot_machine-0.1.1

@@ -10,10 +10,16 @@
         end
 
         def self.default_interval
           @interval || 10
         end
+
+        def self.slots_class
+          @slots_class ||= "#{name}s".split("::").inject(Object) do |mod, name|
+            mod.const_get name
+          end
+        end
       end
     end
 
     def initialize(range_or_length)
       if range_or_length.is_a? Range
@@ -53,10 +59,18 @@
         other = self.class.new other
       end
       match_compared to_compared, other.to_compared, interval
     end
 
+    def +(other)
+      self.class.slots_class.new(self) + other
+    end
+
+    def -(other)
+      self.class.slots_class.new(self) - other
+    end
+
     def ==(other)
       self.class == other.class && self.start == other.start && self.end == other.end && self.length == other.length
     end
 
     def inspect
@@ -70,10 +84,14 @@
       "#<#{self.class.name} #{inspect_variables}>"
     end
 
   protected
 
+    def typecast(value)
+      value.to_s
+    end
+
     def valid?(value)
       true
     end
 
     def to_compared
@@ -123,10 +141,10 @@
     def abs!(value)
       typecast! value, :>=, 0
     end
 
     def typecast!(value, operator, compared)
-      Integer(value.to_s).tap do |value|
+      Integer(typecast(value)).tap do |value|
         raise ArgumentError, "Passed value should be #{operator} #{compared} (#{value} given)" if compared && !value.send(operator, compared)
       end
     end
 
     def valid!(value)
\ No newline at end of file