void V8HTMLElement::HTMLConstructor(
const v8::FunctionCallbackInfo<v8::Value>& info) {
DCHECK(info.IsConstructCall());
v8::Isolate* isolate = info.GetIsolate();
ScriptState* scriptState = ScriptState::current(isolate);
if (!RuntimeEnabledFeatures::customElementsV1Enabled() ||
!scriptState->world().isMainWorld()) {
V8ThrowException::throwTypeError(info.GetIsolate(), "Illegal constructor");
return;
}
LocalDOMWindow* window = scriptState->domWindow();
ScriptCustomElementDefinition* definition =
ScriptCustomElementDefinition::forConstructor(
scriptState, window->customElements(), info.NewTarget());
if (!definition) {
V8ThrowException::throwTypeError(isolate, "Illegal constructor");
return;
}
ExceptionState exceptionState(ExceptionState::ConstructionContext,
"HTMLElement", info.Holder(), isolate);
Element* element;
if (definition->constructionStack().isEmpty()) {
// This is an element being created with 'new' from script
element = definition->createElementForConstructor(*window->document());
} else {
element = definition->constructionStack().last();
if (element) {
// This is an element being upgraded that has called super
definition->constructionStack().last().clear();
} else {
// During upgrade an element has invoked the same constructor
// before calling 'super' and that invocation has poached the
// element.
exceptionState.throwDOMException(InvalidStateError,
"this instance is already constructed");
return;
}
}
const WrapperTypeInfo* wrapperType = element->wrapperTypeInfo();
v8::Local<v8::Object> wrapper = V8DOMWrapper::associateObjectWithWrapper(
isolate, element, wrapperType, info.Holder());
// If the element had a wrapper, we now update and return that
// instead.
v8SetReturnValue(info, wrapper);
wrapper->SetPrototype(scriptState->context(), definition->prototype())
.ToChecked();
}
// https://html.spec.whatwg.org/multipage/dom.html#html-element-constructors
void V8HTMLConstructor::htmlConstructor(
const v8::FunctionCallbackInfo<v8::Value>& info,
const WrapperTypeInfo& wrapperTypeInfo,
const HTMLElementType elementInterfaceName) {
TRACE_EVENT0("blink", "HTMLConstructor");
DCHECK(info.IsConstructCall());
v8::Isolate* isolate = info.GetIsolate();
ScriptState* scriptState = ScriptState::current(isolate);
v8::Local<v8::Value> newTarget = info.NewTarget();
if (!scriptState->contextIsValid()) {
V8ThrowException::throwError(isolate, "The context has been destroyed");
return;
}
if (!RuntimeEnabledFeatures::customElementsV1Enabled() ||
!scriptState->world().isMainWorld()) {
V8ThrowException::throwTypeError(isolate, "Illegal constructor");
return;
}
// 2. If NewTarget is equal to the active function object, then
// throw a TypeError and abort these steps.
v8::Local<v8::Function> activeFunctionObject =
scriptState->perContextData()->constructorForType(
&V8HTMLElement::wrapperTypeInfo);
if (newTarget == activeFunctionObject) {
V8ThrowException::throwTypeError(isolate, "Illegal constructor");
return;
}
LocalDOMWindow* window = scriptState->domWindow();
CustomElementRegistry* registry = window->customElements();
// 3. Let definition be the entry in registry with constructor equal to
// NewTarget.
// If there is no such definition, then throw a TypeError and abort these
// steps.
ScriptCustomElementDefinition* definition =
ScriptCustomElementDefinition::forConstructor(scriptState, registry,
newTarget);
if (!definition) {
V8ThrowException::throwTypeError(isolate, "Illegal constructor");
return;
}
const AtomicString& localName = definition->descriptor().localName();
const AtomicString& name = definition->descriptor().name();
if (localName == name) {
// Autonomous custom element
// 4.1. If the active function object is not HTMLElement, then throw a
// TypeError
if (!V8HTMLElement::wrapperTypeInfo.equals(&wrapperTypeInfo)) {
V8ThrowException::throwTypeError(isolate,
"Illegal constructor: autonomous custom "
"elements must extend HTMLElement");
return;
}
} else {
// Customized built-in element
// 5. If local name is not valid for interface, throw TypeError
if (htmlElementTypeForTag(localName) != elementInterfaceName) {
V8ThrowException::throwTypeError(isolate,
"Illegal constructor: localName does "
"not match the HTML element interface");
return;
}
}
ExceptionState exceptionState(isolate, ExceptionState::ConstructionContext,
"HTMLElement");
v8::TryCatch tryCatch(isolate);
// 6. Let prototype be Get(NewTarget, "prototype"). Rethrow any exceptions.
v8::Local<v8::Value> prototype;
v8::Local<v8::String> prototypeString = v8AtomicString(isolate, "prototype");
if (!v8Call(newTarget.As<v8::Object>()->Get(scriptState->context(),
prototypeString),
prototype)) {
return;
}
// 7. If Type(prototype) is not Object, then: ...
if (!prototype->IsObject()) {
if (V8PerContextData* perContextData = V8PerContextData::from(
newTarget.As<v8::Object>()->CreationContext())) {
prototype =
perContextData->prototypeForType(&V8HTMLElement::wrapperTypeInfo);
} else {
V8ThrowException::throwError(isolate, "The context has been destroyed");
return;
}
}
// 8. If definition's construction stack is empty...
Element* element;
if (definition->constructionStack().isEmpty()) {
// This is an element being created with 'new' from script
element = definition->createElementForConstructor(*window->document());
} else {
element = definition->constructionStack().last();
if (element) {
// This is an element being upgraded that has called super
definition->constructionStack().last().clear();
} else {
// During upgrade an element has invoked the same constructor
// before calling 'super' and that invocation has poached the
// element.
exceptionState.throwDOMException(InvalidStateError,
"this instance is already constructed");
return;
}
}
const WrapperTypeInfo* wrapperType = element->wrapperTypeInfo();
v8::Local<v8::Object> wrapper = V8DOMWrapper::associateObjectWithWrapper(
isolate, element, wrapperType, info.Holder());
// If the element had a wrapper, we now update and return that
// instead.
v8SetReturnValue(info, wrapper);
// 11. Perform element.[[SetPrototypeOf]](prototype). Rethrow any exceptions.
// Note: I don't think this prototype set *can* throw exceptions.
wrapper->SetPrototype(scriptState->context(), prototype.As<v8::Object>())
.ToChecked();
}