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/* -*- mode: C++; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
// SPDX-License-Identifier: MIT OR LGPL-2.0-or-later
// SPDX-FileCopyrightText: 2008 litl, LLC
// SPDX-FileCopyrightText: 2012 Red Hat, Inc.
#include <config.h>
#include <girepository.h>
#include <js/Class.h>
#include <js/ErrorReport.h> // for JS_ReportOutOfMemory
#include <js/Id.h> // for PropertyKey, jsid
#include <js/TypeDecls.h>
#include <js/Utility.h> // for UniqueChars
#include "gi/function.h"
#include "gi/interface.h"
#include "gi/object.h"
#include "gi/repo.h"
#include "gjs/atoms.h"
#include "gjs/context-private.h"
#include "gjs/jsapi-util.h"
#include "gjs/mem-private.h"
InterfacePrototype::InterfacePrototype(GIInterfaceInfo* info, GType gtype)
: GIWrapperPrototype(info, gtype),
m_vtable(
static_cast<GTypeInterface*>(g_type_default_interface_ref(gtype))) {
GJS_INC_COUNTER(interface);
}
InterfacePrototype::~InterfacePrototype(void) {
g_clear_pointer(&m_vtable, g_type_default_interface_unref);
GJS_DEC_COUNTER(interface);
}
static bool append_inferface_properties(JSContext* cx,
JS::MutableHandleIdVector properties,
GIInterfaceInfo* iface_info) {
int n_methods = g_interface_info_get_n_methods(iface_info);
if (!properties.reserve(properties.length() + n_methods)) {
JS_ReportOutOfMemory(cx);
return false;
}
for (int i = 0; i < n_methods; i++) {
GjsAutoFunctionInfo meth_info =
g_interface_info_get_method(iface_info, i);
GIFunctionInfoFlags flags = g_function_info_get_flags(meth_info);
if (flags & GI_FUNCTION_IS_METHOD) {
const char* name = meth_info.name();
jsid id = gjs_intern_string_to_id(cx, name);
if (id.isVoid())
return false;
properties.infallibleAppend(id);
}
}
return true;
}
bool InterfacePrototype::new_enumerate_impl(
JSContext* cx, JS::HandleObject obj [[maybe_unused]],
JS::MutableHandleIdVector properties,
bool only_enumerable [[maybe_unused]]) {
unsigned n_interfaces;
GjsAutoPointer<GType, void, &g_free> interfaces =
g_type_interfaces(gtype(), &n_interfaces);
for (unsigned k = 0; k < n_interfaces; k++) {
GjsAutoInterfaceInfo iface_info =
g_irepository_find_by_gtype(nullptr, interfaces[k]);
if (!iface_info)
continue;
if (!append_inferface_properties(cx, properties, iface_info))
return false;
}
if (!info())
return true;
return append_inferface_properties(cx, properties, info());
}
// See GIWrapperBase::resolve().
bool InterfacePrototype::resolve_impl(JSContext* context, JS::HandleObject obj,
JS::HandleId id, bool* resolved) {
/* If we have no GIRepository information then this interface was defined
* from within GJS. In that case, it has no properties that need to be
* resolved from within C code, as interfaces cannot inherit. */
if (!info()) {
*resolved = false;
return true;
}
JS::UniqueChars prop_name;
if (!gjs_get_string_id(context, id, &prop_name))
return false;
if (!prop_name) {
*resolved = false;
return true; // not resolved, but no error
}
GjsAutoFunctionInfo method_info =
g_interface_info_find_method(m_info, prop_name.get());
if (method_info) {
if (g_function_info_get_flags (method_info) & GI_FUNCTION_IS_METHOD) {
if (!gjs_define_function(context, obj, m_gtype, method_info))
return false;
*resolved = true;
} else {
*resolved = false;
}
} else {
*resolved = false;
}
return true;
}
/*
* InterfaceBase::has_instance:
*
* JSNative implementation of `[Symbol.hasInstance]()`. This method is never
* called directly, but instead is called indirectly by the JS engine as part of
* an `instanceof` expression.
*/
bool InterfaceBase::has_instance(JSContext* cx, unsigned argc, JS::Value* vp) {
GJS_GET_THIS(cx, argc, vp, args, interface_constructor);
JS::RootedObject interface_proto(cx);
const GjsAtoms& atoms = GjsContextPrivate::atoms(cx);
if (!gjs_object_require_property(cx, interface_constructor,
"interface constructor", atoms.prototype(),
&interface_proto))
return false;
InterfaceBase* priv;
if (!for_js_typecheck(cx, interface_proto, &priv))
return false;
return priv->to_prototype()->has_instance_impl(cx, args);
}
// See InterfaceBase::has_instance().
bool InterfacePrototype::has_instance_impl(JSContext* cx,
const JS::CallArgs& args) {
// This method is never called directly, so no need for error messages.
g_assert(args.length() == 1);
if (!args[0].isObject()) {
args.rval().setBoolean(false);
return true;
}
JS::RootedObject instance(cx, &args[0].toObject());
bool isinstance = ObjectBase::typecheck(cx, instance, nullptr, m_gtype,
GjsTypecheckNoThrow());
args.rval().setBoolean(isinstance);
return true;
}
// clang-format off
const struct JSClassOps InterfaceBase::class_ops = {
nullptr, // addProperty
nullptr, // deleteProperty
nullptr, // enumerate
&InterfaceBase::new_enumerate,
&InterfaceBase::resolve,
nullptr, // mayResolve
&InterfaceBase::finalize,
};
const struct JSClass InterfaceBase::klass = {
"GObject_Interface",
JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_BACKGROUND_FINALIZE,
&InterfaceBase::class_ops
};
JSFunctionSpec InterfaceBase::static_methods[] = {
JS_SYM_FN(hasInstance, &InterfaceBase::has_instance, 1, 0),
JS_FS_END
};
// clang-format on
bool
gjs_lookup_interface_constructor(JSContext *context,
GType gtype,
JS::MutableHandleValue value_p)
{
JSObject *constructor;
GIBaseInfo *interface_info;
interface_info = g_irepository_find_by_gtype(nullptr, gtype);
if (!interface_info) {
gjs_throw(context, "Cannot expose non introspectable interface %s",
g_type_name(gtype));
return false;
}
g_assert(g_base_info_get_type(interface_info) ==
GI_INFO_TYPE_INTERFACE);
constructor = gjs_lookup_generic_constructor(context, interface_info);
if (G_UNLIKELY(!constructor))
return false;
g_base_info_unref(interface_info);
value_p.setObject(*constructor);
return true;
}
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