cc64efac44
This is supposed to be its own AO, but since it was only used in one place, we inlined it. Now that it's also being used in the Temporal proposal (Date.prototype.toTemporalInstant() specifically), it makes sense to have it as a standalone function. A small difference is that we now construct the SignedBigInteger without casting to i32 but instead take the (known to be integral) double and cast it to i64. Not perfect, but slightly better. Also clean up the BigInt constructor a bit while we're here and sprinkle some spec comments.
82 lines
2.4 KiB
C++
82 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020-2021, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/String.h>
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#include <LibJS/Runtime/BigInt.h>
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#include <LibJS/Runtime/BigIntConstructor.h>
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#include <LibJS/Runtime/BigIntObject.h>
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/VM.h>
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namespace JS {
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BigIntConstructor::BigIntConstructor(GlobalObject& global_object)
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: NativeFunction(vm().names.BigInt.as_string(), *global_object.function_prototype())
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{
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}
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void BigIntConstructor::initialize(GlobalObject& global_object)
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{
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auto& vm = this->vm();
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NativeFunction::initialize(global_object);
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// 21.2.2.3 BigInt.prototype, https://tc39.es/ecma262/#sec-bigint.prototype
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define_direct_property(vm.names.prototype, global_object.bigint_prototype(), 0);
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define_direct_property(vm.names.length, Value(1), Attribute::Configurable);
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// TODO: Implement these functions below and uncomment this.
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// u8 attr = Attribute::Writable | Attribute::Configurable;
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// define_native_function(vm.names.asIntN, as_int_n, 2, attr);
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// define_native_function(vm.names.asUintN, as_uint_n, 2, attr);
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}
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BigIntConstructor::~BigIntConstructor()
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{
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}
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// 21.2.1.1 BigInt ( value ), https://tc39.es/ecma262/#sec-bigint-constructor-number-value
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Value BigIntConstructor::call()
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{
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auto& vm = this->vm();
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auto& global_object = this->global_object();
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auto value = vm.argument(0);
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// 2. Let prim be ? ToPrimitive(value, number).
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auto primitive = value.to_primitive(global_object, Value::PreferredType::Number);
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if (vm.exception())
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return {};
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// 3. If Type(prim) is Number, return ? NumberToBigInt(prim).
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if (primitive.is_number())
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return number_to_bigint(global_object, primitive);
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// 4. Otherwise, return ? ToBigInt(value).
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return value.to_bigint(global_object);
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}
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// 21.2.1.1 BigInt ( value ), https://tc39.es/ecma262/#sec-bigint-constructor-number-value
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Value BigIntConstructor::construct(FunctionObject&)
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{
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vm().throw_exception<TypeError>(global_object(), ErrorType::NotAConstructor, "BigInt");
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return {};
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}
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// 21.2.2.1 BigInt.asIntN ( bits, bigint ), https://tc39.es/ecma262/#sec-bigint.asintn
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JS_DEFINE_NATIVE_FUNCTION(BigIntConstructor::as_int_n)
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{
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TODO();
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}
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// 21.2.2.2 BigInt.asUintN ( bits, bigint ), https://tc39.es/ecma262/#sec-bigint.asuintn
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JS_DEFINE_NATIVE_FUNCTION(BigIntConstructor::as_uint_n)
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{
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TODO();
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}
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}
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