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104 lines
3.6 KiB
C++
104 lines
3.6 KiB
C++
/*
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* Copyright (c) 2020, Matthew Olsson <mattco@serenityos.org>
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* Copyright (c) 2022-2023, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/Error.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/SymbolConstructor.h>
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namespace JS {
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SymbolConstructor::SymbolConstructor(Realm& realm)
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: NativeFunction(realm.vm().names.Symbol.as_string(), realm.intrinsics().function_prototype())
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{
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}
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void SymbolConstructor::initialize(Realm& realm)
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{
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auto& vm = this->vm();
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Base::initialize(realm);
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// 20.4.2.9 Symbol.prototype, https://tc39.es/ecma262/#sec-symbol.prototype
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define_direct_property(vm.names.prototype, realm.intrinsics().symbol_prototype(), 0);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(realm, vm.names.for_, for_, 1, attr);
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define_native_function(realm, vm.names.keyFor, key_for, 1, attr);
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#define __JS_ENUMERATE(SymbolName, snake_name) \
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define_direct_property(vm.names.SymbolName, vm.well_known_symbol_##snake_name(), 0);
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JS_ENUMERATE_WELL_KNOWN_SYMBOLS
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#undef __JS_ENUMERATE
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define_direct_property(vm.names.length, Value(0), Attribute::Configurable);
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}
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// 20.4.1.1 Symbol ( [ description ] ), https://tc39.es/ecma262/#sec-symbol-description
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ThrowCompletionOr<Value> SymbolConstructor::call()
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{
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auto& vm = this->vm();
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auto description = vm.argument(0);
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// 2. If description is undefined, let descString be undefined.
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// 3. Else, let descString be ? ToString(description).
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auto description_string = description.is_undefined()
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? Optional<String> {}
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: TRY(description.to_string(vm));
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// 4. Return a new Symbol whose [[Description]] is descString.
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return Symbol::create(vm, move(description_string), false);
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}
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// 20.4.1.1 Symbol ( [ description ] ), https://tc39.es/ecma262/#sec-symbol-description
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ThrowCompletionOr<NonnullGCPtr<Object>> SymbolConstructor::construct(FunctionObject&)
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{
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// 1. If NewTarget is not undefined, throw a TypeError exception.
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return vm().throw_completion<TypeError>(ErrorType::NotAConstructor, "Symbol");
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}
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// 20.4.2.2 Symbol.for ( key ), https://tc39.es/ecma262/#sec-symbol.for
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JS_DEFINE_NATIVE_FUNCTION(SymbolConstructor::for_)
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{
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// 1. Let stringKey be ? ToString(key).
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auto string_key = TRY(vm.argument(0).to_string(vm));
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// 2. For each element e of the GlobalSymbolRegistry List, do
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auto result = vm.global_symbol_registry().get(string_key);
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if (result.has_value()) {
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// a. If SameValue(e.[[Key]], stringKey) is true, return e.[[Symbol]].
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return result.value();
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}
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// 3. Assert: GlobalSymbolRegistry does not currently contain an entry for stringKey.
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VERIFY(!result.has_value());
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// 4. Let newSymbol be a new unique Symbol value whose [[Description]] value is stringKey.
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auto new_symbol = Symbol::create(vm, string_key, true);
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// 5. Append the Record { [[Key]]: stringKey, [[Symbol]]: newSymbol } to the GlobalSymbolRegistry List.
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vm.global_symbol_registry().set(string_key, new_symbol);
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// 6. Return newSymbol.
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return new_symbol;
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}
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// 20.4.2.6 Symbol.keyFor ( sym ), https://tc39.es/ecma262/#sec-symbol.keyfor
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JS_DEFINE_NATIVE_FUNCTION(SymbolConstructor::key_for)
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{
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auto argument = vm.argument(0);
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// 1. If sym is not a Symbol, throw a TypeError exception.
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if (!argument.is_symbol())
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return vm.throw_completion<TypeError>(ErrorType::NotASymbol, argument.to_string_without_side_effects());
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// 2. Return KeyForSymbol(sym).
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auto key = argument.as_symbol().key();
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return key.has_value()
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? PrimitiveString::create(vm, key.release_value())
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: js_undefined();
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}
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}
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