static NativeGenerator init(ScriptableObject scope, boolean sealed) {
// Generator
// Can't use "NativeGenerator().exportAsJSClass" since we don't want
// to define "Generator" as a constructor in the top-level scope.
NativeGenerator prototype = new NativeGenerator();
if (scope != null) {
prototype.setParentScope(scope);
prototype.setPrototype(getObjectPrototype(scope));
}
prototype.activatePrototypeMap(MAX_PROTOTYPE_ID);
if (sealed) {
prototype.sealObject();
}
// Need to access Generator prototype when constructing
// Generator instances, but don't have a generator constructor
// to use to find the prototype. Use the "associateValue"
// approach instead.
if (scope != null) {
scope.associateValue(GENERATOR_TAG, prototype);
}
return prototype;
}
static void init(ScriptableObject scope, boolean sealed) {
// Iterator
NativeIterator iterator = new NativeIterator();
iterator.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
// Generator
NativeGenerator.init(scope, sealed);
// StopIteration
NativeObject obj = new StopIteration();
obj.setPrototype(getObjectPrototype(scope));
obj.setParentScope(scope);
if (sealed) {
obj.sealObject();
}
ScriptableObject.defineProperty(scope, STOP_ITERATION, obj, ScriptableObject.DONTENUM);
// Use "associateValue" so that generators can continue to
// throw StopIteration even if the property of the global
// scope is replaced or deleted.
scope.associateValue(ITERATOR_TAG, obj);
}
@Override
public Object execIdCall(
IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
if (!f.hasTag(GENERATOR_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
int id = f.methodId();
if (!(thisObj instanceof NativeGenerator)) throw incompatibleCallError(f);
NativeGenerator generator = (NativeGenerator) thisObj;
switch (id) {
case Id_close:
// need to run any pending finally clauses
return generator.resume(cx, scope, GENERATOR_CLOSE, new GeneratorClosedException());
case Id_next:
// arguments to next() are ignored
generator.firstTime = false;
return generator.resume(cx, scope, GENERATOR_SEND, Undefined.instance);
case Id_send:
{
Object arg = args.length > 0 ? args[0] : Undefined.instance;
if (generator.firstTime && !arg.equals(Undefined.instance)) {
throw ScriptRuntime.typeError0("msg.send.newborn");
}
return generator.resume(cx, scope, GENERATOR_SEND, arg);
}
case Id_throw:
return generator.resume(
cx, scope, GENERATOR_THROW, args.length > 0 ? args[0] : Undefined.instance);
case Id___iterator__:
return thisObj;
default:
throw new IllegalArgumentException(String.valueOf(id));
}
}