7327a28ccc
As mentioned on Discord earlier, we'll add these to all new functions going forward - this is the backfill. Reasons: - It makes you look at the spec, implementing based on MDN or V8 behavior is a no-go - It makes finding the various functions that are non-compliant easier, in the future everything should either have such a comment or, if it's not from the spec at all, a comment explaining why that is the case - It makes it easier to check whether a certain abstract operation is implemented in LibJS, not all of them use the same name as the spec. E.g. RejectPromise() is Promise::reject() - It makes it easier to reason about vm.arguments(), e.g. when the function has a rest parameter - It makes it easier to see whether a certain function is from a proposal or Annex B Also: - Add arguments to all functions and abstract operations that already had a comment - Fix some outdated section numbers - Replace some ecma-international.org URLs with tc39.es
107 lines
3.8 KiB
C++
107 lines
3.8 KiB
C++
/*
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* Copyright (c) 2020, 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 <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/NumberConstructor.h>
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#include <LibJS/Runtime/NumberObject.h>
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#include <math.h>
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#ifdef __clang__
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# define EPSILON_VALUE pow(2, -52)
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# define MAX_SAFE_INTEGER_VALUE pow(2, 53) - 1
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# define MIN_SAFE_INTEGER_VALUE -(pow(2, 53) - 1)
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#else
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constexpr const double EPSILON_VALUE { __builtin_pow(2, -52) };
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constexpr const double MAX_SAFE_INTEGER_VALUE { __builtin_pow(2, 53) - 1 };
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constexpr const double MIN_SAFE_INTEGER_VALUE { -(__builtin_pow(2, 53) - 1) };
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#endif
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namespace JS {
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NumberConstructor::NumberConstructor(GlobalObject& global_object)
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: NativeFunction(vm().names.Number, *global_object.function_prototype())
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{
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}
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void NumberConstructor::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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// 21.1.2.15 Number.prototype, https://tc39.es/ecma262/#sec-number.prototype
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define_property(vm.names.prototype, global_object.number_prototype(), 0);
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define_property(vm.names.length, Value(1), Attribute::Configurable);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(vm.names.isFinite, is_finite, 1, attr);
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define_native_function(vm.names.isInteger, is_integer, 1, attr);
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define_native_function(vm.names.isNaN, is_nan, 1, attr);
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define_native_function(vm.names.isSafeInteger, is_safe_integer, 1, attr);
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define_property(vm.names.parseFloat, global_object.get(vm.names.parseFloat));
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define_property(vm.names.EPSILON, Value(EPSILON_VALUE), 0);
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define_property(vm.names.MAX_VALUE, Value(NumericLimits<double>::max()), 0);
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define_property(vm.names.MIN_VALUE, Value(NumericLimits<double>::min()), 0);
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define_property(vm.names.MAX_SAFE_INTEGER, Value(MAX_SAFE_INTEGER_VALUE), 0);
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define_property(vm.names.MIN_SAFE_INTEGER, Value(MIN_SAFE_INTEGER_VALUE), 0);
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define_property(vm.names.NEGATIVE_INFINITY, js_negative_infinity(), 0);
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define_property(vm.names.POSITIVE_INFINITY, js_infinity(), 0);
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define_property(vm.names.NaN, js_nan(), 0);
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}
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NumberConstructor::~NumberConstructor()
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{
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}
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// 21.1.1.1 Number ( value ), https://tc39.es/ecma262/#sec-number-constructor-number-value
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Value NumberConstructor::call()
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{
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if (!vm().argument_count())
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return Value(0);
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return vm().argument(0).to_number(global_object());
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}
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// 21.1.1.1 Number ( value ), https://tc39.es/ecma262/#sec-number-constructor-number-value
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Value NumberConstructor::construct(Function&)
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{
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double number = 0;
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if (vm().argument_count()) {
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number = vm().argument(0).to_double(global_object());
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if (vm().exception())
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return {};
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}
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return NumberObject::create(global_object(), number);
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}
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// 21.1.2.2 Number.isFinite ( number ), https://tc39.es/ecma262/#sec-number.isfinite
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JS_DEFINE_NATIVE_FUNCTION(NumberConstructor::is_finite)
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{
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return Value(vm.argument(0).is_finite_number());
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}
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// 21.1.2.3 Number.isInteger ( number ), https://tc39.es/ecma262/#sec-number.isinteger
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JS_DEFINE_NATIVE_FUNCTION(NumberConstructor::is_integer)
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{
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return Value(vm.argument(0).is_integer());
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}
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// 21.1.2.4 Number.isNaN ( number ), https://tc39.es/ecma262/#sec-number.isnan
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JS_DEFINE_NATIVE_FUNCTION(NumberConstructor::is_nan)
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{
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return Value(vm.argument(0).is_nan());
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}
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// 21.1.2.5 Number.isSafeInteger ( number ), https://tc39.es/ecma262/#sec-number.issafeinteger
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JS_DEFINE_NATIVE_FUNCTION(NumberConstructor::is_safe_integer)
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{
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if (!vm.argument(0).is_number())
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return Value(false);
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auto value = vm.argument(0).as_double();
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return Value((int64_t)value == value && value >= MIN_SAFE_INTEGER_VALUE && value <= MAX_SAFE_INTEGER_VALUE);
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}
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}
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