[gjs] gi: object: add function to check if a JSObject contains a GObject

[Lionel Landwerlin <llandwerlin src gnome org>]

commit 2f886b0f40c44a0b244ddd6cebeca1671c94542d
Author: Lionel Landwerlin <llandwerlin gmail com>
Date:   Mon Dec 9 16:04:02 2013 +0000

    gi: object: add function to check if a JSObject contains a GObject

 gi/object.cpp |   20 ++++++++++++++++++++
 gi/object.h   |    3 +++
 2 files changed, 23 insertions(+), 0 deletions(-)
---
diff --git a/gi/object.cpp b/gi/object.cpp
index 93a0ad6..20a2afe 100644
--- a/gi/object.cpp
+++ b/gi/object.cpp
@@ -2079,6 +2079,26 @@ gjs_g_object_from_object(JSContext    *context,
 }
 
 JSBool
+gjs_typecheck_is_object(JSContext     *context,
+                        JSObject      *object,
+                        JSBool         throw_error)
+{
+
+    if (do_base_typecheck(context, object, throw_error)) {
+        ObjectInstance *priv = priv_from_js(context, object);
+
+        if (priv)
+            return JS_TRUE;
+    }
+
+    if (throw_error)
+        gjs_throw(context,
+                  "Object instance or prototype is not a GObject");
+
+    return JS_FALSE;
+}
+
+JSBool
 gjs_typecheck_object(JSContext     *context,
                      JSObject      *object,
                      GType          expected_type,
diff --git a/gi/object.h b/gi/object.h
index 7b3b9a4..47b6781 100644
--- a/gi/object.h
+++ b/gi/object.h
@@ -43,6 +43,9 @@ JSBool    gjs_typecheck_object          (JSContext     *context,
                                          JSObject      *obj,
                                          GType          expected_type,
                                          JSBool         throw_error);
+JSBool    gjs_typecheck_is_object       (JSContext     *context,
+                                         JSObject      *obj,
+                                         JSBool         throw_error);
 
 void      gjs_object_prepare_shutdown   (JSContext     *context);