Refactor check before `mrb_class_ptr()`; ref #3602

src/class.c

@@ -123,6 +123,19 @@ module_from_sym(mrb_state *mrb, struct RClass *klass, mrb_sym id)
   return mrb_class_ptr(c);
 }
 
+static mrb_bool
+class_ptr_p(mrb_value obj)
+{
+  switch (mrb_type(obj)) {
+  case MRB_TT_CLASS:
+  case MRB_TT_SCLASS:
+  case MRB_TT_MODULE:
+    return TRUE;
+  default:
+    return FALSE;
+  }
+}
+
 MRB_API struct RClass*
 mrb_class_outer_module(mrb_state *mrb, struct RClass *c)
 {
@@ -137,14 +150,8 @@ mrb_class_outer_module(mrb_state *mrb, struct RClass *c)
     mrb_value klass;
     klass = mrb_obj_iv_get(mrb, (struct RObject *)cls,
                            mrb_intern_lit(mrb, "__attached__"));
-    switch (mrb_type(klass)) {
-    case MRB_TT_CLASS:
-    case MRB_TT_SCLASS:
-    case MRB_TT_MODULE:
+    if (class_ptr_p(klass)) {
       cls = mrb_class_ptr(klass);
-      break;
-    default:
-      break;
     }
   }
   return cls;
@@ -153,12 +160,7 @@ mrb_class_outer_module(mrb_state *mrb, struct RClass *c)
 static void
 check_if_class_or_module(mrb_state *mrb, mrb_value obj)
 {
-  switch (mrb_type(obj)) {
-  case MRB_TT_CLASS:
-  case MRB_TT_SCLASS:
-  case MRB_TT_MODULE:
-    return;
-  default:
+  if (!class_ptr_p(obj)) {
     mrb_raisef(mrb, E_TYPE_ERROR, "%S is not a class/module", mrb_inspect(mrb, obj));
   }
 }
@@ -616,14 +618,8 @@ mrb_get_args(mrb_state *mrb, const char *format, ...)
           mrb_value ss;
 
           ss = ARGV[arg_i++];
-          switch (mrb_type(ss)) {
-          case MRB_TT_CLASS:
-          case MRB_TT_MODULE:
-          case MRB_TT_SCLASS:
-            break;
-          default:
+          if (!class_ptr_p(ss)) {
             mrb_raisef(mrb, E_TYPE_ERROR, "%S is not class/module", ss);
-            break;
           }
           *p = ss;
           i++;
@@ -1772,15 +1768,11 @@ mrb_mod_to_s(mrb_state *mrb, mrb_value klass)
 
     str = mrb_str_new_lit(mrb, "#<Class:");
 
-    switch (mrb_type(v)) {
-      case MRB_TT_CLASS:
-      case MRB_TT_MODULE:
-      case MRB_TT_SCLASS:
+    if (class_ptr_p(v)) {
       mrb_str_cat_str(mrb, str, mrb_inspect(mrb, v));
-        break;
-      default:
+    }
+    else {
       mrb_str_cat_str(mrb, str, mrb_any_to_s(mrb, v));
-        break;
     }
     return mrb_str_cat_lit(mrb, str, ">");
   }