Merge pull request #1194 from carsonmcdonald/rtomissingimpl

Implement respond_to_missing?

src/kernel.c

@@ -965,7 +965,7 @@ obj_respond_to(mrb_state *mrb, mrb_value self)
   mrb_value *argv;
   int argc;
   mrb_value mid, priv;
-  mrb_sym id;
+  mrb_sym id, rtm_id;
   mrb_bool respond_to_p;
 
   mrb_get_args(mrb, "*", &argv, &argc);
@@ -976,6 +976,13 @@ obj_respond_to(mrb_state *mrb, mrb_value self)
 
   respond_to_p = basic_obj_respond_to(mrb, self, id, !mrb_test(priv));
 
+  if(!respond_to_p) {
+    rtm_id = mrb_intern2(mrb, "respond_to_missing?", 19);
+    if(basic_obj_respond_to(mrb, self, rtm_id, !mrb_test(priv))) {
+      return mrb_funcall_argv(mrb, self, rtm_id, argc, argv);
+    }
+  }
+
   return mrb_bool_value(respond_to_p);
 }
 

test/t/kernel.rb

@@ -392,3 +392,16 @@ assert('Kernel#!=') do
   (str1 != str3) == true and
   (str2 != str1) == false
 end
+
+assert('Kernel#respond_to_missing?') do
+
+  class Test4RespondToMissing
+    def respond_to_missing?(method_name, include_private = false)
+      method_name == :a_method
+    end
+  end
+
+  Test4RespondToMissing.new.respond_to?(:a_method) == true and
+  Test4RespondToMissing.new.respond_to?(:no_method) == false
+
+end