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LibJS: Add spec comments to BigIntPrototype

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This commit is contained in:
Linus Groh 2023-01-27 21:30:13 +00:00
parent 7b139c6982
commit 02808948ec
1 changed files with 20 additions and 2 deletions
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22
Userland/Libraries/LibJS/Runtime/BigIntPrototype.cpp
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2020-2022, Linus Groh <linusg@serenityos.org>
* Copyright (c) 2020-2023, Linus Groh <linusg@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
@ -38,23 +38,40 @@ void BigIntPrototype::initialize(Realm& realm)
// thisBigIntValue ( value ), https://tc39.es/ecma262/#thisbigintvalue
static ThrowCompletionOr<BigInt*> this_bigint_value(VM& vm, Value value)
{
// 1. If value is a BigInt, return value.
if (value.is_bigint())
return &value.as_bigint();
if (value.is_object() && is<BigIntObject>(value.as_object()))
// 2. If value is an Object and value has a [[BigIntData]] internal slot, then
if (value.is_object() && is<BigIntObject>(value.as_object())) {
// a. Assert: value.[[BigIntData]] is a BigInt.
// b. Return value.[[BigIntData]].
return &static_cast<BigIntObject&>(value.as_object()).bigint();
}
// 3. Throw a TypeError exception.
return vm.throw_completion<TypeError>(ErrorType::NotAnObjectOfType, "BigInt");
}
// 21.2.3.3 BigInt.prototype.toString ( [ radix ] ), https://tc39.es/ecma262/#sec-bigint.prototype.tostring
JS_DEFINE_NATIVE_FUNCTION(BigIntPrototype::to_string)
{
// 1. Let x be ? thisBigIntValue(this value).
auto* bigint = TRY(this_bigint_value(vm, vm.this_value()));
// 2. If radix is undefined, let radixMV be 10.
double radix = 10;
// 3. Else, let radixMV be ? ToIntegerOrInfinity(radix).
if (!vm.argument(0).is_undefined()) {
radix = TRY(vm.argument(0).to_integer_or_infinity(vm));
// 4. If radixMV is not in the inclusive interval from 2 to 36, throw a RangeError exception.
if (radix < 2 || radix > 36)
return vm.throw_completion<RangeError>(ErrorType::InvalidRadix);
}
// 5. Return BigInt::toString(x, radixMV).
return PrimitiveString::create(vm, bigint->big_integer().to_base_deprecated(radix));
}
@ -81,6 +98,7 @@ JS_DEFINE_NATIVE_FUNCTION(BigIntPrototype::to_locale_string)
// 21.2.3.4 BigInt.prototype.valueOf ( ), https://tc39.es/ecma262/#sec-bigint.prototype.valueof
JS_DEFINE_NATIVE_FUNCTION(BigIntPrototype::value_of)
{
// 1. Return ? thisBigIntValue(this value).
return TRY(this_bigint_value(vm, vm.this_value()));
}