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LibJS: Add ECMA-262 section/title/URL comments almost everywhere

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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- Fix some outdated section numbers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
This commit is contained in:
Linus Groh 2021-06-13 00:22:35 +01:00
parent 322c8a3995
commit 7327a28ccc
52 changed files with 480 additions and 101 deletions
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14
Userland/Libraries/LibJS/Runtime/NumberConstructor.cpp
View file

@ -31,14 +31,18 @@ void NumberConstructor::initialize(GlobalObject& global_object)
{
auto& vm = this->vm();
NativeFunction::initialize(global_object);
// 21.1.2.15 Number.prototype, https://tc39.es/ecma262/#sec-number.prototype
define_property(vm.names.prototype, global_object.number_prototype(), 0);
define_property(vm.names.length, Value(1), Attribute::Configurable);
u8 attr = Attribute::Writable | Attribute::Configurable;
define_native_function(vm.names.isFinite, is_finite, 1, attr);
define_native_function(vm.names.isInteger, is_integer, 1, attr);
define_native_function(vm.names.isNaN, is_nan, 1, attr);
define_native_function(vm.names.isSafeInteger, is_safe_integer, 1, attr);
define_property(vm.names.parseFloat, global_object.get(vm.names.parseFloat));
define_property(vm.names.prototype, global_object.number_prototype(), 0);
define_property(vm.names.length, Value(1), Attribute::Configurable);
define_property(vm.names.EPSILON, Value(EPSILON_VALUE), 0);
define_property(vm.names.MAX_VALUE, Value(NumericLimits<double>::max()), 0);
define_property(vm.names.MIN_VALUE, Value(NumericLimits<double>::min()), 0);
@ -53,6 +57,7 @@ NumberConstructor::~NumberConstructor()
{
}
// 21.1.1.1 Number ( value ), https://tc39.es/ecma262/#sec-number-constructor-number-value
Value NumberConstructor::call()
{
if (!vm().argument_count())
@ -60,6 +65,7 @@ Value NumberConstructor::call()
return vm().argument(0).to_number(global_object());
}
// 21.1.1.1 Number ( value ), https://tc39.es/ecma262/#sec-number-constructor-number-value
Value NumberConstructor::construct(Function&)
{
double number = 0;
@ -71,21 +77,25 @@ Value NumberConstructor::construct(Function&)
return NumberObject::create(global_object(), number);
}
// 21.1.2.2 Number.isFinite ( number ), https://tc39.es/ecma262/#sec-number.isfinite
JS_DEFINE_NATIVE_FUNCTION(NumberConstructor::is_finite)
{
return Value(vm.argument(0).is_finite_number());
}
// 21.1.2.3 Number.isInteger ( number ), https://tc39.es/ecma262/#sec-number.isinteger
JS_DEFINE_NATIVE_FUNCTION(NumberConstructor::is_integer)
{
return Value(vm.argument(0).is_integer());
}
// 21.1.2.4 Number.isNaN ( number ), https://tc39.es/ecma262/#sec-number.isnan
JS_DEFINE_NATIVE_FUNCTION(NumberConstructor::is_nan)
{
return Value(vm.argument(0).is_nan());
}
// 21.1.2.5 Number.isSafeInteger ( number ), https://tc39.es/ecma262/#sec-number.issafeinteger
JS_DEFINE_NATIVE_FUNCTION(NumberConstructor::is_safe_integer)
{
if (!vm.argument(0).is_number())