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- /*
- * Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
- * Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <LibJS/Runtime/Error.h>
- #include <LibJS/Runtime/GlobalObject.h>
- #include <LibJS/Runtime/SymbolConstructor.h>
- namespace JS {
- SymbolConstructor::SymbolConstructor(Realm& realm)
- : NativeFunction(realm.vm().names.Symbol.as_string(), *realm.intrinsics().function_prototype())
- {
- }
- void SymbolConstructor::initialize(Realm& realm)
- {
- auto& vm = this->vm();
- NativeFunction::initialize(realm);
- // 20.4.2.9 Symbol.prototype, https://tc39.es/ecma262/#sec-symbol.prototype
- define_direct_property(vm.names.prototype, realm.intrinsics().symbol_prototype(), 0);
- u8 attr = Attribute::Writable | Attribute::Configurable;
- define_native_function(realm, vm.names.for_, for_, 1, attr);
- define_native_function(realm, vm.names.keyFor, key_for, 1, attr);
- #define __JS_ENUMERATE(SymbolName, snake_name) \
- define_direct_property(vm.names.SymbolName, vm.well_known_symbol_##snake_name(), 0);
- JS_ENUMERATE_WELL_KNOWN_SYMBOLS
- #undef __JS_ENUMERATE
- define_direct_property(vm.names.length, Value(0), Attribute::Configurable);
- }
- // 20.4.1.1 Symbol ( [ description ] ), https://tc39.es/ecma262/#sec-symbol-description
- 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);
- }
- // 20.4.1.1 Symbol ( [ description ] ), https://tc39.es/ecma262/#sec-symbol-description
- ThrowCompletionOr<NonnullGCPtr<Object>> SymbolConstructor::construct(FunctionObject&)
- {
- return vm().throw_completion<TypeError>(ErrorType::NotAConstructor, "Symbol");
- }
- // 20.4.2.2 Symbol.for ( key ), https://tc39.es/ecma262/#sec-symbol.for
- JS_DEFINE_NATIVE_FUNCTION(SymbolConstructor::for_)
- {
- // 1. Let stringKey be ? ToString(key).
- auto string_key = TRY(vm.argument(0).to_string(vm));
- // 2. For each element e of the GlobalSymbolRegistry List, do
- auto result = vm.global_symbol_registry().get(string_key);
- if (result.has_value()) {
- // a. If SameValue(e.[[Key]], stringKey) is true, return e.[[Symbol]].
- return result.value();
- }
- // 3. Assert: GlobalSymbolRegistry does not currently contain an entry for stringKey.
- VERIFY(!result.has_value());
- // 4. Let newSymbol be a new unique Symbol value whose [[Description]] value is stringKey.
- auto new_symbol = Symbol::create(vm, string_key, true);
- // 5. Append the Record { [[Key]]: stringKey, [[Symbol]]: newSymbol } to the GlobalSymbolRegistry List.
- vm.global_symbol_registry().set(string_key, new_symbol);
- // 6. Return newSymbol.
- return new_symbol;
- }
- // 20.4.2.6 Symbol.keyFor ( sym ), https://tc39.es/ecma262/#sec-symbol.keyfor
- JS_DEFINE_NATIVE_FUNCTION(SymbolConstructor::key_for)
- {
- auto argument = vm.argument(0);
- if (!argument.is_symbol())
- return vm.throw_completion<TypeError>(ErrorType::NotASymbol, argument.to_string_without_side_effects());
- auto& symbol = argument.as_symbol();
- if (symbol.is_global())
- return PrimitiveString::create(vm, symbol.description());
- return js_undefined();
- }
- }
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