testSetPropertyIgnoringNamedGetter.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

 * vim: set ts=8 sts=2 et sw=2 tw=80:

*/

#include "jsfriendapi.h"

#include "js/PropertyAndElement.h"  // JS_DefineProperty

#include "js/Proxy.h"

#include "jsapi-tests/tests.h"

using namespace js;

using namespace JS;

class CustomProxyHandler : public Wrapper {

 public:

  CustomProxyHandler() : Wrapper(0) {}

  bool getOwnPropertyDescriptor(

      JSContext* cx, HandleObject proxy, HandleId id,

      MutableHandle<mozilla::Maybe<PropertyDescriptor>> desc) const override {

    if (id.isString() &&

        JS_LinearStringEqualsLiteral(id.toLinearString(), "phantom")) {

      desc.set(mozilla::Some(PropertyDescriptor::Data(

          Int32Value(42),

          {PropertyAttribute::Configurable, PropertyAttribute::Enumerable,

           PropertyAttribute::Writable})));

      return true;

    return Wrapper::getOwnPropertyDescriptor(cx, proxy, id, desc);

  bool set(JSContext* cx, HandleObject proxy, HandleId id, HandleValue v,

           HandleValue receiver, ObjectOpResult& result) const override {

    Rooted<mozilla::Maybe<PropertyDescriptor>> desc(cx);

    if (!Wrapper::getOwnPropertyDescriptor(cx, proxy, id, &desc)) {

      return false;

    return SetPropertyIgnoringNamedGetter(cx, proxy, id, v, receiver, desc,

                                          result);

};

MOZ_RUNINIT const CustomProxyHandler customProxyHandler;

BEGIN_TEST(testSetPropertyIgnoringNamedGetter_direct) {

  RootedValue protov(cx);

  EVAL("Object.prototype", &protov);

  RootedValue targetv(cx);

  EVAL("({})", &targetv);

  RootedObject proxyObj(cx, NewProxyObject(cx, &customProxyHandler, targetv,

                                           &protov.toObject(), ProxyOptions()));

  CHECK(proxyObj);

  CHECK(JS_DefineProperty(cx, global, "target", targetv, 0));

  CHECK(JS_DefineProperty(cx, global, "proxy", proxyObj, 0));

  RootedValue v(cx);

  EVAL("Object.getOwnPropertyDescriptor(proxy, 'phantom').value", &v);

  CHECK_SAME(v, Int32Value(42));

  EXEC("proxy.phantom = 123");

  EVAL("Object.getOwnPropertyDescriptor(proxy, 'phantom').value", &v);

  CHECK_SAME(v, Int32Value(42));

  EVAL("target.phantom", &v);

  CHECK_SAME(v, Int32Value(123));

  return true;

END_TEST(testSetPropertyIgnoringNamedGetter_direct)