tor-browser

call.js (6813B)

---

// |reftest| skip-if(!this.hasOwnProperty("Intl"))

function IsIntlService(c) {
   return typeof c === "function" &&
          c.hasOwnProperty("prototype") &&
          c.prototype.hasOwnProperty("resolvedOptions");
}

function IsObject(o) {
   return Object(o) === o;
}

function IsPrimitive(o) {
   return Object(o) !== o;
}

function thisValues() {
   const intlConstructors = Object.getOwnPropertyNames(Intl).map(name => Intl[name]).filter(IsIntlService);

   return [
       // Primitive values.
       ...[undefined, null, true, "abc", Symbol(), 123],

       // Object values.
       ...[{}, [], /(?:)/, function(){}, new Proxy({}, {})],

       // Intl objects.
       ...[].concat(...intlConstructors.map(ctor => {
           let args = [];
           if (ctor === Intl.DisplayNames) {
               // Intl.DisplayNames can't be constructed without any arguments.
               args = [undefined, {type: "language"}];
           }

           return [
               // Instance of an Intl constructor.
               new ctor(...args),

               // Instance of a subclassed Intl constructor.
               new class extends ctor {}(...args),

               // Object inheriting from an Intl constructor prototype.
               Object.create(ctor.prototype),

               // Intl object not inheriting from its default prototype.
               Object.setPrototypeOf(new ctor(...args), Object.prototype),
           ];
       })),
   ];
}

const intlFallbackSymbol = Object.getOwnPropertySymbols(Intl.NumberFormat.call(Object.create(Intl.NumberFormat.prototype)))[0];

// Invoking [[Call]] for Intl.NumberFormat returns a new instance unless called
// with an instance inheriting from Intl.NumberFormat.prototype.
for (let thisValue of thisValues()) {
   let obj = Intl.NumberFormat.call(thisValue);

   if (!Intl.NumberFormat.prototype.isPrototypeOf(thisValue)) {
       assertEq(Object.is(obj, thisValue), false);
       assertEq(obj instanceof Intl.NumberFormat, true);
       if (IsObject(thisValue))
           assertEqArray(Object.getOwnPropertySymbols(thisValue), []);
   } else {
       assertEq(Object.is(obj, thisValue), true);
       assertEq(obj instanceof Intl.NumberFormat, true);
       assertEqArray(Object.getOwnPropertySymbols(thisValue), [intlFallbackSymbol]);
   }
}

// Intl.NumberFormat uses the legacy Intl constructor compromise semantics.
// - Test when InstanceofOperator(thisValue, %NumberFormat%) returns true.
for (let thisValue of thisValues().filter(IsObject)) {
   let isPrototypeOf = Intl.NumberFormat.prototype.isPrototypeOf(thisValue);
   let hasInstanceCalled = false;
   Object.defineProperty(Intl.NumberFormat, Symbol.hasInstance, {
       value() {
           assertEq(hasInstanceCalled, false);
           hasInstanceCalled = true;
           return true;
       }, configurable: true
   });
   let obj = Intl.NumberFormat.call(thisValue);
   delete Intl.NumberFormat[Symbol.hasInstance];

   assertEq(Object.is(obj, thisValue), isPrototypeOf);
   assertEq(hasInstanceCalled, false);
   assertEqArray(Object.getOwnPropertySymbols(thisValue), isPrototypeOf ? [intlFallbackSymbol] : []);
}
// - Test when InstanceofOperator(thisValue, %NumberFormat%) returns false.
for (let thisValue of thisValues().filter(IsObject)) {
   let isPrototypeOf = Intl.NumberFormat.prototype.isPrototypeOf(thisValue);
   let hasInstanceCalled = false;
   Object.defineProperty(Intl.NumberFormat, Symbol.hasInstance, {
       value() {
           assertEq(hasInstanceCalled, false);
           hasInstanceCalled = true;
           return false;
       }, configurable: true
   });
   let obj = Intl.NumberFormat.call(thisValue);
   delete Intl.NumberFormat[Symbol.hasInstance];

   assertEq(Object.is(obj, thisValue), isPrototypeOf);
   assertEq(obj instanceof Intl.NumberFormat, true);
   assertEq(hasInstanceCalled, false);
   assertEqArray(Object.getOwnPropertySymbols(thisValue), isPrototypeOf ? [intlFallbackSymbol] : []);
}
// - Test with primitive values.
for (let thisValue of thisValues().filter(IsPrimitive)) {
   // Ensure @@hasInstance is not called.
   Object.defineProperty(Intl.NumberFormat, Symbol.hasInstance, {
       value() { assertEq(true, false); }, configurable: true
   });
   let obj = Intl.NumberFormat.call(thisValue);
   delete Intl.NumberFormat[Symbol.hasInstance];

   assertEq(Object.is(obj, thisValue), false);
   assertEq(obj instanceof Intl.NumberFormat, true);
}

// Throws an error when attempting to install [[FallbackSymbol]] twice.
{
   let thisValue = Object.create(Intl.NumberFormat.prototype);
   assertEqArray(Object.getOwnPropertySymbols(thisValue), []);

   assertEq(Intl.NumberFormat.call(thisValue), thisValue);
   assertEqArray(Object.getOwnPropertySymbols(thisValue), [intlFallbackSymbol]);

   assertThrowsInstanceOf(() => Intl.NumberFormat.call(thisValue), TypeError);
   assertEqArray(Object.getOwnPropertySymbols(thisValue), [intlFallbackSymbol]);
}

// Throws an error when the thisValue is non-extensible.
{
   let thisValue = Object.create(Intl.NumberFormat.prototype);
   Object.preventExtensions(thisValue);

   assertThrowsInstanceOf(() => Intl.NumberFormat.call(thisValue), TypeError);
   assertEqArray(Object.getOwnPropertySymbols(thisValue), []);
}

// [[FallbackSymbol]] is installed as a frozen property holding an Intl.NumberFormat instance.
{
   let thisValue = Object.create(Intl.NumberFormat.prototype);
   Intl.NumberFormat.call(thisValue);

   let desc = Object.getOwnPropertyDescriptor(thisValue, intlFallbackSymbol);
   assertEq(desc !== undefined, true);
   assertEq(desc.writable, false);
   assertEq(desc.enumerable, false);
   assertEq(desc.configurable, false);
   assertEq(desc.value instanceof Intl.NumberFormat, true);
}

// Ensure [[FallbackSymbol]] is installed last by changing the [[Prototype]]
// during initialization.
{
   let thisValue = {};
   let options = {
       get useGrouping() {
           Object.setPrototypeOf(thisValue, Intl.NumberFormat.prototype);
           return false;
       }
   };
   let obj = Intl.NumberFormat.call(thisValue, undefined, options);
   assertEq(Object.is(obj, thisValue), true);
   assertEqArray(Object.getOwnPropertySymbols(thisValue), [intlFallbackSymbol]);
}
{
   let thisValue = Object.create(Intl.NumberFormat.prototype);
   let options = {
       get useGrouping() {
           Object.setPrototypeOf(thisValue, Object.prototype);
           return false;
       }
   };
   let obj = Intl.NumberFormat.call(thisValue, undefined, options);
   assertEq(Object.is(obj, thisValue), false);
   assertEqArray(Object.getOwnPropertySymbols(thisValue), []);
}

if (typeof reportCompare === "function")
   reportCompare(true, true);