/**
* 19.4.2.5 Symbol.keyFor (sym)
*
* @param cx the execution context
* @param thisValue the function this-value
* @param sym the global symbol
* @return the symbol string key or undefined if the symbol is not in the registry
*/
@Function(name = "keyFor", arity = 1)
public static Object keyFor(ExecutionContext cx, Object thisValue, Object sym) {
/* step 1 */
if (!Type.isSymbol(sym)) {
throw newTypeError(cx, Messages.Key.NotSymbol);
}
/* steps 2-3 */
String key = cx.getRealm().getSymbolRegistry().getKey(Type.symbolValue(sym));
/* step 4 */
return key != null ? key : UNDEFINED;
}
/** 23.4.1.1 WeakSet ([ iterable ]) */
@Override
public WeakSetObject construct(
ExecutionContext callerContext, Constructor newTarget, Object... args) {
ExecutionContext calleeContext = calleeContext();
Object iterable = argument(args, 0);
/* step 1 (not applicable) */
/* steps 2-4 */
WeakSetObject set =
OrdinaryCreateFromConstructor(
calleeContext, newTarget, Intrinsics.WeakSetPrototype, WeakSetObjectAllocator.INSTANCE);
/* steps 5-6, 8 */
if (Type.isUndefinedOrNull(iterable)) {
return set;
}
/* step 7 */
Object _adder = Get(calleeContext, set, "add");
if (!IsCallable(_adder)) {
throw newTypeError(calleeContext, Messages.Key.PropertyNotCallable, "add");
}
Callable adder = (Callable) _adder;
ScriptIterator<?> iter = GetScriptIterator(calleeContext, iterable);
/* step 9 */
try {
while (iter.hasNext()) {
Object nextValue = iter.next();
adder.call(calleeContext, set, nextValue);
}
return set;
} catch (ScriptException e) {
iter.close(e);
throw e;
}
}
/** 19.4.1.1 Symbol ( [ description ] ) */
@Override
public Symbol call(ExecutionContext callerContext, Object thisValue, Object... args) {
ExecutionContext calleeContext = calleeContext();
Object description = argument(args, 0);
/* step 1 (not applicable) */
/* steps 2-4 */
String descString =
Type.isUndefined(description) ? null : ToFlatString(calleeContext, description);
/* step 5 */
return new Symbol(descString);
}