base.rb in compositor-0.1.4

- old
+ new

@@ -1,6 +1,8 @@
 module Compositor
+  class MethodAlreadyDefinedError < RuntimeError; end
+
   class Base
     attr_reader :attrs
     attr_accessor :root, :context
 
     def initialize(view_context, attrs = {})
@@ -39,10 +41,14 @@
       klazz.name.gsub(/(.*::)|(Compositor$)/, '').underscore
     end
 
     def self.inherited(subclass)
       method_name = root_class_name(subclass)
-      unless method_name.eql?("base") # check if it's already defined
+      unless method_name.eql?("base") || method_name.start_with?("abstract")
+        # check if it's already defined
+        if Compositor::DSL.instance_methods.include?(method_name.to_sym)
+          raise MethodAlreadyDefinedError.new("Method #{method_name} is already defined on the DSL class.")
+        end
         Compositor::DSL.send(:define_method, method_name) do |*args, &block|
           subclass.
             new(@context, *args).
             dsl(self, &block)
         end