[gjs] Better toString() for introspection objects

[Colin Walters <walters src gnome org>]

commit 0d0e4216cd1fbe7b80a1c26fa8f02362e66e188b
Author: Colin Walters <walters verbum org>
Date:   Thu Aug 13 21:30:19 2009 -0400

    Better toString() for introspection objects
    
    It's useful to get the memory address of both the proxy object
    and the GObject so one can use gdb on them, as well as visually
    compare when printf debugging.

 gi/object.c |   39 +++++++++++++++++++++++++++++++++++++++
 1 files changed, 39 insertions(+), 0 deletions(-)
---
diff --git a/gi/object.c b/gi/object.c
index dbf8376..0941fae 100644
--- a/gi/object.c
+++ b/gi/object.c
@@ -1122,6 +1122,44 @@ emit_func(JSContext *context,
     return !failed;
 }
 
+/* Default spidermonkey toString is worthless.  Replace it
+ * with something that gives us both the introspection name
+ * and a memory address.
+ */
+static JSBool
+to_string_func(JSContext *context,
+               JSObject  *obj,
+               uintN      argc,
+               jsval     *argv,
+               jsval     *retval)
+{
+    ObjectInstance *priv;
+    char *strval;
+    JSBool ret;
+    const char *namespace;
+    const char *name;
+    
+    *retval = JSVAL_VOID;
+
+    priv = priv_from_js(context, obj);
+
+    if (priv == NULL)
+        return JS_FALSE; /* wrong class passed in */
+    
+    namespace = g_base_info_get_namespace( (GIBaseInfo*) priv->info);
+    name = g_base_info_get_name( (GIBaseInfo*) priv->info); 
+
+    if (priv->gobj == NULL) {
+        strval = g_strdup_printf ("[object prototype of GIName:%s.%s jsobj %p]", namespace, name, obj);
+    } else {
+        strval = g_strdup_printf ("[object instance proxy GIName:%s.%s jsobj %p native %p]", namespace, name, obj, priv->gobj);
+    }
+    
+    ret = gjs_string_from_utf8 (context, strval, -1, retval);
+    g_free (strval);
+    return ret;
+}
+
 /* The bizarre thing about this vtable is that it applies to both
  * instances of the object, and to the prototype that instances of the
  * class have.
@@ -1157,6 +1195,7 @@ static JSFunctionSpec gjs_object_instance_proto_funcs[] = {
     { "connect_after", connect_after_func, 0, 0 },
     { "disconnect", disconnect_func, 0, 0 },
     { "emit", emit_func, 0, 0 },
+    { "toString", to_string_func, 0, 0 },
     { NULL }
 };