Method lazy_define_gobject_property

gi/object.cpp:1494–1573

}

bool ObjectPrototype::lazy_define_gobject_property(
    JSContext* cx, JS::HandleObject obj, JS::HandleId id, GParamSpec* pspec,
    bool* resolved, const char* name,
    const Maybe<const GI::AutoPropertyInfo>& property_info) {
    JS::RootedId canonical_id{cx};
    JS::Rooted<JS::PropertyDescriptor> canonical_desc{cx};

    // Make property configurable so that interface properties can be
    // overridden by GObject.ParamSpec.override in the class that
    // implements them
    unsigned flags = GJS_MODULE_PROP_FLAGS & ~JSPROP_PERMANENT;

    if (!g_str_equal(pspec->name, name)) {
        canonical_id = gjs_intern_string_to_id(cx, pspec->name);

        JS::Rooted<mozilla::Maybe<JS::PropertyDescriptor>> desc{cx};
        if (!JS_GetOwnPropertyDescriptorById(cx, obj, canonical_id, &desc))
            return false;

        if (desc.isSome()) {
            debug_jsprop("Defining alias GObject property", id, obj);
            canonical_desc = *desc;
            if (!JS_DefinePropertyById(cx, obj, id, canonical_desc))
                return false;

            *resolved = true;
            return true;
        }
    }

    debug_jsprop("Defining lazy GObject property", id, obj);

    if (!(pspec->flags & (G_PARAM_WRITABLE | G_PARAM_READABLE))) {
        if (!JS_DefinePropertyById(cx, obj, id, JS::UndefinedHandleValue,
                                   flags))
            return false;

        if (!canonical_id.isVoid() &&
            !JS_DefinePropertyById(cx, obj, canonical_id,
                                   JS::UndefinedHandleValue, flags))
            return false;

        *resolved = true;
        return true;
    }

    // Do not fetch JS overridden properties from GObject, to avoid
    // infinite recursion.
    if (g_param_spec_get_qdata(pspec, ObjectBase::custom_property_quark())) {
        *resolved = false;
        return true;
    }

    JS::RootedValue getter_priv{cx};
    JSNative js_getter =
        get_getter_for_property(cx, pspec, property_info, &getter_priv);
    if (!js_getter)
        return false;