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LibJS: Replace SymbolPrototype's typed_this() with this_symbol_value()

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This brings the code close to the spec with no trade-offs, which is
always valuable.

No functionality change.
This commit is contained in:
Linus Groh 2021-06-06 16:39:29 +01:00 • committed by Andreas Kling
parent 6f96f01171
commit fc2673d111
1 changed files with 16 additions and 20 deletions
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36
Userland/Libraries/LibJS/Runtime/SymbolPrototype.cpp
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@ -38,40 +38,36 @@ SymbolPrototype::~SymbolPrototype()
{
}
static SymbolObject* typed_this(VM& vm, GlobalObject& global_object)
// thisSymbolValue, https://tc39.es/ecma262/#thissymbolvalue
static Value this_symbol_value(GlobalObject& global_object, Value value)
{
auto* this_object = vm.this_value(global_object).to_object(global_object);
if (!this_object)
return nullptr;
if (!is<SymbolObject>(this_object)) {
vm.throw_exception<TypeError>(global_object, ErrorType::NotA, "Symbol");
return nullptr;
}
return static_cast<SymbolObject*>(this_object);
if (value.is_symbol())
return value;
if (value.is_object() && is<SymbolObject>(value.as_object()))
return static_cast<SymbolObject&>(value.as_object()).value_of();
auto& vm = global_object.vm();
vm.throw_exception<TypeError>(global_object, ErrorType::NotA, "Symbol");
return {};
}
JS_DEFINE_NATIVE_GETTER(SymbolPrototype::description_getter)
{
auto* this_object = typed_this(vm, global_object);
if (!this_object)
auto symbol_value = this_symbol_value(global_object, vm.this_value(global_object));
if (vm.exception())
return {};
return js_string(vm, this_object->description());
return js_string(vm, symbol_value.as_symbol().description());
}
JS_DEFINE_NATIVE_FUNCTION(SymbolPrototype::to_string)
{
auto* this_object = typed_this(vm, global_object);
if (!this_object)
auto symbol_value = this_symbol_value(global_object, vm.this_value(global_object));
if (vm.exception())
return {};
auto string = this_object->primitive_symbol().to_string();
return js_string(vm, move(string));
return js_string(vm, symbol_value.as_symbol().to_string());
}
JS_DEFINE_NATIVE_FUNCTION(SymbolPrototype::value_of)
{
auto* this_object = typed_this(vm, global_object);
if (!this_object)
return {};
return this_object->value_of();
return this_symbol_value(global_object, vm.this_value(global_object));
}
}