74 lines
2.4 KiB
C++
74 lines
2.4 KiB
C++
/*
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* Copyright (c) 2020, Matthew Olsson <mattco@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(vm().names.Symbol.as_string(), *realm.global_object().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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NativeFunction::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.global_object().symbol_prototype(), 0);
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u8 attr = Attribute::Writable | Attribute::Configurable;
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define_native_function(vm.names.for_, for_, 1, attr);
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define_native_function(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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if (vm.argument(0).is_undefined())
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return js_symbol(vm, {}, false);
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return js_symbol(vm, TRY(vm.argument(0).to_string(vm)), 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<Object*> SymbolConstructor::construct(FunctionObject&)
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{
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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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auto description = TRY(vm.argument(0).to_string(vm));
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return global_object.vm().get_global_symbol(description);
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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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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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auto& symbol = argument.as_symbol();
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if (symbol.is_global())
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return js_string(vm, symbol.description());
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return js_undefined();
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}
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}
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