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/*
* Copyright (C) 1999 Lars Knoll (knoll@kde.org)
* (C) 1999 Antti Koivisto (koivisto@kde.org)
* (C) 2001 Dirk Mueller (mueller@kde.org)
* Copyright (C) 2004-2016 Apple Inc. All rights reserved.
* (C) 2006 Alexey Proskuryakov (ap@nypop.com)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*
*/
#include "config.h"
#include "FormAssociatedElement.h"
#include "EditorClient.h"
#include "ElementAncestorIterator.h"
#include "FormController.h"
#include "Frame.h"
#include "HTMLFormControlElement.h"
#include "HTMLFormElement.h"
#include "HTMLNames.h"
#include "HTMLObjectElement.h"
#include "IdTargetObserver.h"
namespace WebCore {
using namespace HTMLNames;
class FormAttributeTargetObserver final : private IdTargetObserver {
WTF_MAKE_FAST_ALLOCATED;
public:
FormAttributeTargetObserver(const AtomicString& id, FormAssociatedElement&);
private:
void idTargetChanged() override;
FormAssociatedElement& m_element;
};
FormAssociatedElement::FormAssociatedElement(HTMLFormElement* form)
: m_form(nullptr)
, m_formSetByParser(makeWeakPtr(form))
{
}
FormAssociatedElement::~FormAssociatedElement()
{
setForm(nullptr);
}
void FormAssociatedElement::didMoveToNewDocument(Document&)
{
HTMLElement& element = asHTMLElement();
if (element.hasAttributeWithoutSynchronization(formAttr) && element.isConnected())
resetFormAttributeTargetObserver();
}
void FormAssociatedElement::insertedIntoAncestor(Node::InsertionType insertionType, ContainerNode&)
{
HTMLElement& element = asHTMLElement();
if (m_formSetByParser) {
// The form could have been removed by a script during parsing.
if (m_formSetByParser->isConnected())
setForm(m_formSetByParser.get());
m_formSetByParser = nullptr;
}
if (m_form && element.rootElement() != m_form->rootElement())
setForm(nullptr);
if (!insertionType.connectedToDocument)
return;
if (element.hasAttributeWithoutSynchronization(formAttr))
resetFormAttributeTargetObserver();
}
void FormAssociatedElement::removedFromAncestor(Node::RemovalType, ContainerNode&)
{
m_formAttributeTargetObserver = nullptr;
// If the form and element are both in the same tree, preserve the connection to the form.
// Otherwise, null out our form and remove ourselves from the form's list of elements.
// Do not rely on rootNode() because our IsInTreeScope is outdated.
if (m_form && &asHTMLElement().traverseToRootNode() != &m_form->traverseToRootNode())
setForm(nullptr);
}
HTMLFormElement* FormAssociatedElement::findAssociatedForm(const HTMLElement* element, HTMLFormElement* currentAssociatedForm)
{
const AtomicString& formId(element->attributeWithoutSynchronization(formAttr));
if (!formId.isNull() && element->isConnected()) {
// The HTML5 spec says that the element should be associated with
// the first element in the document to have an ID that equal to
// the value of form attribute, so we put the result of
// treeScope().getElementById() over the given element.
RefPtr<Element> newFormCandidate = element->treeScope().getElementById(formId);
if (is<HTMLFormElement>(newFormCandidate))
return downcast<HTMLFormElement>(newFormCandidate.get());
return nullptr;
}
if (!currentAssociatedForm)
return HTMLFormElement::findClosestFormAncestor(*element);
return currentAssociatedForm;
}
void FormAssociatedElement::formOwnerRemovedFromTree(const Node& formRoot)
{
ASSERT(m_form);
// Can't use RefPtr here beacuse this function might be called inside ~ShadowRoot via addChildNodesToDeletionQueue. See webkit.org/b/189493.
Node* rootNode = &asHTMLElement();
for (auto* ancestor = asHTMLElement().parentNode(); ancestor; ancestor = ancestor->parentNode()) {
if (ancestor == m_form) {
// Form is our ancestor so we don't need to reset our owner, we also no longer
// need an id observer since we are no longer connected.
m_formAttributeTargetObserver = nullptr;
return;
}
rootNode = ancestor;
}
// We are no longer in the same tree as our form owner so clear our owner.
if (rootNode != &formRoot)
setForm(nullptr);
}
void FormAssociatedElement::setForm(HTMLFormElement* newForm)
{
if (m_form == newForm)
return;
willChangeForm();
if (m_form)
m_form->removeFormElement(this);
m_form = makeWeakPtr(newForm);
if (newForm)
newForm->registerFormElement(this);
didChangeForm();
}
void FormAssociatedElement::willChangeForm()
{
}
void FormAssociatedElement::didChangeForm()
{
}
void FormAssociatedElement::formWillBeDestroyed()
{
ASSERT(m_form);
if (!m_form)
return;
willChangeForm();
m_form = nullptr;
didChangeForm();
}
void FormAssociatedElement::resetFormOwner()
{
RefPtr<HTMLFormElement> originalForm = m_form.get();
setForm(findAssociatedForm(&asHTMLElement(), originalForm.get()));
HTMLElement& element = asHTMLElement();
auto* newForm = m_form.get();
if (newForm && newForm != originalForm && newForm->isConnected())
element.document().didAssociateFormControl(element);
}
void FormAssociatedElement::formAttributeChanged()
{
HTMLElement& element = asHTMLElement();
if (!element.hasAttributeWithoutSynchronization(formAttr)) {
// The form attribute removed. We need to reset form owner here.
RefPtr<HTMLFormElement> originalForm = m_form.get();
// FIXME: Why does this not pass originalForm to findClosestFormAncestor?
setForm(HTMLFormElement::findClosestFormAncestor(element));
auto* newForm = m_form.get();
if (newForm && newForm != originalForm && newForm->isConnected())
element.document().didAssociateFormControl(element);
m_formAttributeTargetObserver = nullptr;
} else {
resetFormOwner();
if (element.isConnected())
resetFormAttributeTargetObserver();
}
}
bool FormAssociatedElement::customError() const
{
return willValidate() && !m_customValidationMessage.isEmpty();
}
bool FormAssociatedElement::hasBadInput() const
{
return false;
}
bool FormAssociatedElement::patternMismatch() const
{
return false;
}
bool FormAssociatedElement::rangeOverflow() const
{
return false;
}
bool FormAssociatedElement::rangeUnderflow() const
{
return false;
}
bool FormAssociatedElement::stepMismatch() const
{
return false;
}
bool FormAssociatedElement::tooShort() const
{
return false;
}
bool FormAssociatedElement::tooLong() const
{
return false;
}
bool FormAssociatedElement::typeMismatch() const
{
return false;
}
bool FormAssociatedElement::isValid() const
{
bool someError = typeMismatch() || stepMismatch() || rangeUnderflow() || rangeOverflow()
|| tooShort() || tooLong() || patternMismatch() || valueMissing() || hasBadInput() || customError();
return !someError;
}
bool FormAssociatedElement::valueMissing() const
{
return false;
}
String FormAssociatedElement::customValidationMessage() const
{
return m_customValidationMessage;
}
String FormAssociatedElement::validationMessage() const
{
return customError() ? m_customValidationMessage : String();
}
void FormAssociatedElement::setCustomValidity(const String& error)
{
m_customValidationMessage = error;
}
void FormAssociatedElement::resetFormAttributeTargetObserver()
{
ASSERT_WITH_SECURITY_IMPLICATION(asHTMLElement().isConnected());
m_formAttributeTargetObserver = std::make_unique<FormAttributeTargetObserver>(asHTMLElement().attributeWithoutSynchronization(formAttr), *this);
}
void FormAssociatedElement::formAttributeTargetChanged()
{
resetFormOwner();
}
const AtomicString& FormAssociatedElement::name() const
{
const AtomicString& name = asHTMLElement().getNameAttribute();
return name.isNull() ? emptyAtom() : name;
}
bool FormAssociatedElement::isFormControlElementWithState() const
{
return false;
}
FormAttributeTargetObserver::FormAttributeTargetObserver(const AtomicString& id, FormAssociatedElement& element)
: IdTargetObserver(element.asHTMLElement().treeScope().idTargetObserverRegistry(), id)
, m_element(element)
{
}
void FormAttributeTargetObserver::idTargetChanged()
{
m_element.formAttributeTargetChanged();
}
} // namespace Webcore