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LibJS: Store and return undefined Symbol description

Browse source 
Instead of the current incorrect behaviour of just defaulting to an
empty string.
This commit is contained in:
Idan Horowitz 2021-06-15 02:40:55 +03:00 • committed by Linus Groh
parent 4aff4249aa
commit dac971b4ae
5 changed files with 17 additions and 19 deletions
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6
Userland/Libraries/LibJS/Runtime/Symbol.cpp
View file

@ -10,7 +10,7 @@
namespace JS {
Symbol::Symbol(String description, bool is_global)
Symbol::Symbol(Optional<String> description, bool is_global)
: m_description(move(description))
, m_is_global(is_global)
{
@ -20,12 +20,12 @@ Symbol::~Symbol()
{
}
Symbol* js_symbol(Heap& heap, String description, bool is_global)
Symbol* js_symbol(Heap& heap, Optional<String> description, bool is_global)
{
return heap.allocate_without_global_object<Symbol>(move(description), is_global);
}
Symbol* js_symbol(VM& vm, String description, bool is_global)
Symbol* js_symbol(VM& vm, Optional<String> description, bool is_global)
{
return js_symbol(vm.heap(), move(description), is_global);
}

11
Userland/Libraries/LibJS/Runtime/Symbol.h
View file

@ -16,21 +16,22 @@ class Symbol final : public Cell {
AK_MAKE_NONMOVABLE(Symbol);
public:
Symbol(String, bool);
Symbol(Optional<String>, bool);
virtual ~Symbol();
const String& description() const { return m_description; }
String description() const { return m_description.value_or(""); }
const Optional<String>& raw_description() const { return m_description; }
bool is_global() const { return m_is_global; }
String to_string() const { return String::formatted("Symbol({})", description()); }
private:
virtual const char* class_name() const override { return "Symbol"; }
String m_description;
Optional<String> m_description;
bool m_is_global;
};
Symbol* js_symbol(Heap&, String description, bool is_global);
Symbol* js_symbol(VM&, String description, bool is_global);
Symbol* js_symbol(Heap&, Optional<String> description, bool is_global);
Symbol* js_symbol(VM&, Optional<String> description, bool is_global);
}

12
Userland/Libraries/LibJS/Runtime/SymbolConstructor.cpp
View file

@ -42,8 +42,8 @@ SymbolConstructor::~SymbolConstructor()
// 20.4.1.1 Symbol ( [ description ] ), https://tc39.es/ecma262/#sec-symbol-description
Value SymbolConstructor::call()
{
if (!vm().argument_count())
return js_symbol(heap(), "", false);
if (vm().argument(0).is_undefined())
return js_symbol(heap(), {}, false);
return js_symbol(heap(), vm().argument(0).to_string(global_object()), false);
}
@ -57,13 +57,7 @@ Value SymbolConstructor::construct(Function&)
// 20.4.2.2 Symbol.for ( key ), https://tc39.es/ecma262/#sec-symbol.for
JS_DEFINE_NATIVE_FUNCTION(SymbolConstructor::for_)
{
String description;
if (!vm.argument_count()) {
description = "undefined";
} else {
description = vm.argument(0).to_string(global_object);
}
String description = vm.argument(0).to_string(global_object);
return global_object.vm().get_global_symbol(description);
}

2
Userland/Libraries/LibJS/Runtime/SymbolObject.h
View file

@ -23,7 +23,7 @@ public:
Symbol& primitive_symbol() { return m_symbol; }
const Symbol& primitive_symbol() const { return m_symbol; }
const String& description() const { return m_symbol.description(); }
String description() const { return m_symbol.description(); }
bool is_global() const { return m_symbol.is_global(); }
virtual Value value_of() const override

5
Userland/Libraries/LibJS/Runtime/SymbolPrototype.cpp
View file

@ -58,7 +58,10 @@ JS_DEFINE_NATIVE_GETTER(SymbolPrototype::description_getter)
auto symbol_value = this_symbol_value(global_object, vm.this_value(global_object));
if (vm.exception())
return {};
return js_string(vm, symbol_value.as_symbol().description());
auto& description = symbol_value.as_symbol().raw_description();
if (!description.has_value())
return js_undefined();
return js_string(vm, *description);
}
// 20.4.3.3 Symbol.prototype.toString ( ), https://tc39.es/ecma262/#sec-symbol.prototype.tostring