mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2024-09-30 00:31:14 +00:00
LibJS: Add spec comments to SymbolConstructor
This commit is contained in:
parent
066133d97b
commit
0ae511edae
Notes:
sideshowbarker
2024-07-17 02:29:45 +09:00
Author: https://github.com/linusg Commit: https://github.com/SerenityOS/serenity/commit/0ae511edae Pull-request: https://github.com/SerenityOS/serenity/pull/18336 Reviewed-by: https://github.com/trflynn89 ✅
|
@ -34,4 +34,20 @@ ErrorOr<String> Symbol::descriptive_string() const
|
|||
return String::formatted("Symbol({})", description);
|
||||
}
|
||||
|
||||
// 20.4.5.1 KeyForSymbol ( sym ), https://tc39.es/ecma262/#sec-keyforsymbol
|
||||
Optional<String> Symbol::key() const
|
||||
{
|
||||
// 1. For each element e of the GlobalSymbolRegistry List, do
|
||||
// a. If SameValue(e.[[Symbol]], sym) is true, return e.[[Key]].
|
||||
if (m_is_global) {
|
||||
// NOTE: Global symbols should always have a description string
|
||||
VERIFY(m_description.has_value());
|
||||
return m_description;
|
||||
}
|
||||
|
||||
// 2. Assert: GlobalSymbolRegistry does not currently contain an entry for sym.
|
||||
// 3. Return undefined.
|
||||
return {};
|
||||
}
|
||||
|
||||
}
|
||||
|
|
|
@ -24,6 +24,7 @@ public:
|
|||
bool is_global() const { return m_is_global; }
|
||||
|
||||
ErrorOr<String> descriptive_string() const;
|
||||
Optional<String> key() const;
|
||||
|
||||
private:
|
||||
Symbol(Optional<String>, bool);
|
||||
|
|
|
@ -42,14 +42,22 @@ ThrowCompletionOr<void> SymbolConstructor::initialize(Realm& realm)
|
|||
ThrowCompletionOr<Value> SymbolConstructor::call()
|
||||
{
|
||||
auto& vm = this->vm();
|
||||
if (vm.argument(0).is_undefined())
|
||||
return Symbol::create(vm, {}, false);
|
||||
return Symbol::create(vm, TRY(vm.argument(0).to_string(vm)), false);
|
||||
auto description = vm.argument(0);
|
||||
|
||||
// 2. If description is undefined, let descString be undefined.
|
||||
// 3. Else, let descString be ? ToString(description).
|
||||
auto description_string = description.is_undefined()
|
||||
? Optional<String> {}
|
||||
: TRY(description.to_string(vm));
|
||||
|
||||
// 4. Return a new Symbol whose [[Description]] is descString.
|
||||
return Symbol::create(vm, move(description_string), false);
|
||||
}
|
||||
|
||||
// 20.4.1.1 Symbol ( [ description ] ), https://tc39.es/ecma262/#sec-symbol-description
|
||||
ThrowCompletionOr<NonnullGCPtr<Object>> SymbolConstructor::construct(FunctionObject&)
|
||||
{
|
||||
// 1. If NewTarget is not undefined, throw a TypeError exception.
|
||||
return vm().throw_completion<TypeError>(ErrorType::NotAConstructor, "Symbol");
|
||||
}
|
||||
|
||||
|
@ -83,16 +91,16 @@ JS_DEFINE_NATIVE_FUNCTION(SymbolConstructor::for_)
|
|||
JS_DEFINE_NATIVE_FUNCTION(SymbolConstructor::key_for)
|
||||
{
|
||||
auto argument = vm.argument(0);
|
||||
|
||||
// 1. If sym is not a Symbol, throw a TypeError exception.
|
||||
if (!argument.is_symbol())
|
||||
return vm.throw_completion<TypeError>(ErrorType::NotASymbol, TRY_OR_THROW_OOM(vm, argument.to_string_without_side_effects()));
|
||||
|
||||
auto& symbol = argument.as_symbol();
|
||||
if (symbol.is_global()) {
|
||||
// NOTE: Global symbols should always have a description string
|
||||
return PrimitiveString::create(vm, *symbol.description());
|
||||
}
|
||||
|
||||
return js_undefined();
|
||||
// 2. Return KeyForSymbol(sym).
|
||||
auto key = argument.as_symbol().key();
|
||||
return key.has_value()
|
||||
? PrimitiveString::create(vm, key.release_value())
|
||||
: js_undefined();
|
||||
}
|
||||
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue