Source/core/html/HTMLFormElement.cpp

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
m_requestAutocompleteTimer
create
rendererIsNeeded
insertedInto
notifyFormRemovedFromTree
removedFrom
handleLocalEvents
length
item
submitImplicitly
submitElementFromEvent
validateInteractively
prepareForSubmission
submit
submitFromJavaScript
submitDialog
submit
scheduleFormSubmission
reset
requestAutocomplete
finishRequestAutocomplete
requestAutocompleteTimerFired
parseAttribute
associate
disassociate
isURLAttribute
hasLegalLinkAttribute
associate
disassociate
createWeakPtr
didAssociateByParser
elements
collectAssociatedElements
associatedElements
collectImageElements
imageElements
name
noValidate
action
setEnctype
method
setMethod
wasUserSubmitted
defaultButton
checkValidity
checkValidityWithoutDispatchingEvents
checkInvalidControlsAndCollectUnhandled
elementFromPastNamesMap
addToPastNamesMap
removeFromPastNamesMap
getNamedElements
shouldAutocomplete
finishParsingChildren
copyNonAttributePropertiesFromElement
anonymousNamedGetter
setDemoted
/*
 * 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, 2005, 2006, 2007, 2008, 2009 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 "core/html/HTMLFormElement.h"

#include <limits>
#include "HTMLNames.h"
#include "bindings/v8/ScriptController.h"
#include "bindings/v8/ScriptEventListener.h"
#include "core/dom/Attribute.h"
#include "core/dom/Document.h"
#include "core/dom/ElementTraversal.h"
#include "core/dom/IdTargetObserverRegistry.h"
#include "core/events/AutocompleteErrorEvent.h"
#include "core/events/Event.h"
#include "core/events/ScopedEventQueue.h"
#include "core/html/HTMLCollection.h"
#include "core/html/HTMLDialogElement.h"
#include "core/html/HTMLImageElement.h"
#include "core/html/HTMLInputElement.h"
#include "core/html/HTMLObjectElement.h"
#include "core/html/RadioNodeList.h"
#include "core/html/forms/FormController.h"
#include "core/loader/FrameLoader.h"
#include "core/loader/FrameLoaderClient.h"
#include "core/frame/DOMWindow.h"
#include "core/frame/LocalFrame.h"
#include "core/frame/UseCounter.h"
#include "core/frame/csp/ContentSecurityPolicy.h"
#include "core/rendering/RenderTextControl.h"
#include "platform/UserGestureIndicator.h"

using namespace std;

namespace WebCore {

using namespace HTMLNames;

HTMLFormElement::HTMLFormElement(Document& document)
    : HTMLElement(formTag, document)
    , m_weakPtrFactory(this)
    , m_associatedElementsAreDirty(false)
    , m_imageElementsAreDirty(false)
    , m_hasElementsAssociatedByParser(false)
    , m_didFinishParsingChildren(false)
    , m_wasUserSubmitted(false)
    , m_shouldSubmit(false)
    , m_isInResetFunction(false)
    , m_wasDemoted(false)
    , m_requestAutocompleteTimer(this, &HTMLFormElement::requestAutocompleteTimerFired)
{
    ScriptWrappable::init(this);
}

PassRefPtr<HTMLFormElement> HTMLFormElement::create(Document& document)
{
    UseCounter::count(document, UseCounter::FormElement);
    return adoptRef(new HTMLFormElement(document));
}

HTMLFormElement::~HTMLFormElement()
{
    document().formController().willDeleteForm(this);
}

bool HTMLFormElement::rendererIsNeeded(const RenderStyle& style)
{
    if (!m_wasDemoted)
        return HTMLElement::rendererIsNeeded(style);

    ContainerNode* node = parentNode();
    if (!node || !node->renderer())
        return HTMLElement::rendererIsNeeded(style);
    RenderObject* parentRenderer = node->renderer();
    // FIXME: Shouldn't we also check for table caption (see |formIsTablePart| below).
    // FIXME: This check is not correct for Shadow DOM.
    bool parentIsTableElementPart = (parentRenderer->isTable() && isHTMLTableElement(*node))
        || (parentRenderer->isTableRow() && isHTMLTableRowElement(*node))
        || (parentRenderer->isTableSection() && node->hasTagName(tbodyTag))
        || (parentRenderer->isRenderTableCol() && node->hasTagName(colTag))
        || (parentRenderer->isTableCell() && isHTMLTableRowElement(*node));

    if (!parentIsTableElementPart)
        return true;

    EDisplay display = style.display();
    bool formIsTablePart = display == TABLE || display == INLINE_TABLE || display == TABLE_ROW_GROUP
        || display == TABLE_HEADER_GROUP || display == TABLE_FOOTER_GROUP || display == TABLE_ROW
        || display == TABLE_COLUMN_GROUP || display == TABLE_COLUMN || display == TABLE_CELL
        || display == TABLE_CAPTION;

    return formIsTablePart;
}

Node::InsertionNotificationRequest HTMLFormElement::insertedInto(ContainerNode* insertionPoint)
{
    HTMLElement::insertedInto(insertionPoint);
    if (insertionPoint->inDocument())
        this->document().didAssociateFormControl(this);
    return InsertionDone;
}

template<class T>
void notifyFormRemovedFromTree(const Vector<T*>& elements, Node& root)
{
    size_t size = elements.size();
    for (size_t i = 0; i < size; ++i)
        elements[i]->formRemovedFromTree(root);
    ASSERT(elements.size() == size);
}

void HTMLFormElement::removedFrom(ContainerNode* insertionPoint)
{
    // We don't need to take care of form association by 'form' content
    // attribute becuse IdTargetObserver handles it.
    if (m_hasElementsAssociatedByParser) {
        Node& root = highestAncestor();
        if (!m_associatedElementsAreDirty) {
            Vector<FormAssociatedElement*> elements(associatedElements());
            notifyFormRemovedFromTree(elements, root);
        } else {
            Vector<FormAssociatedElement*> elements;
            collectAssociatedElements(insertionPoint->highestAncestor(), elements);
            notifyFormRemovedFromTree(elements, root);
            collectAssociatedElements(root, elements);
            notifyFormRemovedFromTree(elements, root);
        }

        if (!m_imageElementsAreDirty) {
            Vector<HTMLImageElement*> images(imageElements());
            notifyFormRemovedFromTree(images, root);
        } else {
            Vector<HTMLImageElement*> images;
            collectImageElements(insertionPoint->highestAncestor(), images);
            notifyFormRemovedFromTree(images, root);
            collectImageElements(root, images);
            notifyFormRemovedFromTree(images, root);
        }
    }
    HTMLElement::removedFrom(insertionPoint);
}

void HTMLFormElement::handleLocalEvents(Event* event)
{
    Node* targetNode = event->target()->toNode();
    if (event->eventPhase() != Event::CAPTURING_PHASE && targetNode && targetNode != this && (event->type() == EventTypeNames::submit || event->type() == EventTypeNames::reset)) {
        event->stopPropagation();
        return;
    }
    HTMLElement::handleLocalEvents(event);
}

unsigned HTMLFormElement::length() const
{
    const Vector<FormAssociatedElement*>& elements = associatedElements();
    unsigned len = 0;
    for (unsigned i = 0; i < elements.size(); ++i) {
        if (elements[i]->isEnumeratable())
            ++len;
    }
    return len;
}

Element* HTMLFormElement::item(unsigned index)
{
    return elements()->item(index);
}

void HTMLFormElement::submitImplicitly(Event* event, bool fromImplicitSubmissionTrigger)
{
    int submissionTriggerCount = 0;
    bool seenDefaultButton = false;
    const Vector<FormAssociatedElement*>& elements = associatedElements();
    for (unsigned i = 0; i < elements.size(); ++i) {
        FormAssociatedElement* formAssociatedElement = elements[i];
        if (!formAssociatedElement->isFormControlElement())
            continue;
        HTMLFormControlElement* control = toHTMLFormControlElement(formAssociatedElement);
        if (!seenDefaultButton && control->canBeSuccessfulSubmitButton()) {
            if (fromImplicitSubmissionTrigger)
                seenDefaultButton = true;
            if (control->isSuccessfulSubmitButton()) {
                control->dispatchSimulatedClick(event);
                return;
            } else if (fromImplicitSubmissionTrigger) {
                // Default (submit) button is not activated; no implicit submission.
                return;
            }
        } else if (control->canTriggerImplicitSubmission()) {
            ++submissionTriggerCount;
        }
    }
    if (fromImplicitSubmissionTrigger && submissionTriggerCount == 1)
        prepareForSubmission(event);
}

// FIXME: Consolidate this and similar code in FormSubmission.cpp.
static inline HTMLFormControlElement* submitElementFromEvent(const Event* event)
{
    for (Node* node = event->target()->toNode(); node; node = node->parentOrShadowHostNode()) {
        if (node->isElementNode() && toElement(node)->isFormControlElement())
            return toHTMLFormControlElement(node);
    }
    return 0;
}

bool HTMLFormElement::validateInteractively(Event* event)
{
    ASSERT(event);
    if (!document().page() || noValidate())
        return true;

    HTMLFormControlElement* submitElement = submitElementFromEvent(event);
    if (submitElement && submitElement->formNoValidate())
        return true;

    const Vector<FormAssociatedElement*>& elements = associatedElements();
    for (unsigned i = 0; i < elements.size(); ++i) {
        if (elements[i]->isFormControlElement())
            toHTMLFormControlElement(elements[i])->hideVisibleValidationMessage();
    }

    Vector<RefPtr<FormAssociatedElement> > unhandledInvalidControls;
    if (!checkInvalidControlsAndCollectUnhandled(&unhandledInvalidControls))
        return true;
    // Because the form has invalid controls, we abort the form submission and
    // show a validation message on a focusable form control.

    // Needs to update layout now because we'd like to call isFocusable(), which
    // has !renderer()->needsLayout() assertion.
    document().updateLayoutIgnorePendingStylesheets();

    RefPtr<HTMLFormElement> protector(this);
    // Focus on the first focusable control and show a validation message.
    for (unsigned i = 0; i < unhandledInvalidControls.size(); ++i) {
        FormAssociatedElement* unhandledAssociatedElement = unhandledInvalidControls[i].get();
        HTMLElement* unhandled = toHTMLElement(unhandledAssociatedElement);
        if (unhandled->isFocusable() && unhandled->inDocument()) {
            unhandled->scrollIntoViewIfNeeded(false);
            unhandled->focus();
            if (unhandled->isFormControlElement())
                toHTMLFormControlElement(unhandled)->updateVisibleValidationMessage();
            break;
        }
    }
    // Warn about all of unfocusable controls.
    if (document().frame()) {
        for (unsigned i = 0; i < unhandledInvalidControls.size(); ++i) {
            FormAssociatedElement* unhandledAssociatedElement = unhandledInvalidControls[i].get();
            HTMLElement* unhandled = toHTMLElement(unhandledAssociatedElement);
            if (unhandled->isFocusable() && unhandled->inDocument())
                continue;
            String message("An invalid form control with name='%name' is not focusable.");
            message.replace("%name", unhandledAssociatedElement->name());
            document().addConsoleMessage(RenderingMessageSource, ErrorMessageLevel, message);
        }
    }
    return false;
}

bool HTMLFormElement::prepareForSubmission(Event* event)
{
    RefPtr<HTMLFormElement> protector(this);
    LocalFrame* frame = document().frame();
    if (!frame)
        return false;

    m_shouldSubmit = false;

    // Interactive validation must be done before dispatching the submit event.
    if (!validateInteractively(event))
        return false;

    frame->loader().client()->dispatchWillSendSubmitEvent(this);

    if (dispatchEvent(Event::createCancelableBubble(EventTypeNames::submit)))
        m_shouldSubmit = true;

    if (m_shouldSubmit)
        submit(event, true, true, NotSubmittedByJavaScript);

    return m_shouldSubmit;
}

void HTMLFormElement::submit()
{
    submit(0, false, true, NotSubmittedByJavaScript);
}

void HTMLFormElement::submitFromJavaScript()
{
    submit(0, false, UserGestureIndicator::processingUserGesture(), SubmittedByJavaScript);
}

void HTMLFormElement::submitDialog(PassRefPtr<FormSubmission> formSubmission)
{
    for (Node* node = this; node; node = node->parentOrShadowHostNode()) {
        if (isHTMLDialogElement(*node)) {
            toHTMLDialogElement(*node).closeDialog(formSubmission->result());
            return;
        }
    }
}

void HTMLFormElement::submit(Event* event, bool activateSubmitButton, bool processingUserGesture, FormSubmissionTrigger formSubmissionTrigger)
{
    FrameView* view = document().view();
    LocalFrame* frame = document().frame();
    if (!view || !frame || !frame->page())
        return;

    m_wasUserSubmitted = processingUserGesture;

    RefPtr<HTMLFormControlElement> firstSuccessfulSubmitButton;
    bool needButtonActivation = activateSubmitButton; // do we need to activate a submit button?

    const Vector<FormAssociatedElement*>& elements = associatedElements();
    for (unsigned i = 0; i < elements.size(); ++i) {
        FormAssociatedElement* associatedElement = elements[i];
        if (!associatedElement->isFormControlElement())
            continue;
        if (needButtonActivation) {
            HTMLFormControlElement* control = toHTMLFormControlElement(associatedElement);
            if (control->isActivatedSubmit())
                needButtonActivation = false;
            else if (firstSuccessfulSubmitButton == 0 && control->isSuccessfulSubmitButton())
                firstSuccessfulSubmitButton = control;
        }
    }

    if (needButtonActivation && firstSuccessfulSubmitButton)
        firstSuccessfulSubmitButton->setActivatedSubmit(true);

    RefPtr<FormSubmission> formSubmission = FormSubmission::create(this, m_attributes, event, formSubmissionTrigger);
    EventQueueScope scopeForDialogClose; // Delay dispatching 'close' to dialog until done submitting.
    if (formSubmission->method() == FormSubmission::DialogMethod)
        submitDialog(formSubmission.release());
    else
        scheduleFormSubmission(formSubmission.release());

    if (needButtonActivation && firstSuccessfulSubmitButton)
        firstSuccessfulSubmitButton->setActivatedSubmit(false);

    m_shouldSubmit = false;
}

void HTMLFormElement::scheduleFormSubmission(PassRefPtr<FormSubmission> submission)
{
    ASSERT(submission->method() == FormSubmission::PostMethod || submission->method() == FormSubmission::GetMethod);
    ASSERT(submission->data());
    ASSERT(submission->state());
    if (submission->action().isEmpty())
        return;
    if (document().isSandboxed(SandboxForms)) {
        // FIXME: This message should be moved off the console once a solution to https://bugs.webkit.org/show_bug.cgi?id=103274 exists.
        document().addConsoleMessage(SecurityMessageSource, ErrorMessageLevel, "Blocked form submission to '" + submission->action().elidedString() + "' because the form's frame is sandboxed and the 'allow-forms' permission is not set.");
        return;
    }

    if (protocolIsJavaScript(submission->action())) {
        if (!document().contentSecurityPolicy()->allowFormAction(KURL(submission->action())))
            return;
        document().frame()->script().executeScriptIfJavaScriptURL(submission->action());
        return;
    }

    LocalFrame* targetFrame = document().frame()->loader().findFrameForNavigation(submission->target(), submission->state()->sourceDocument());
    if (!targetFrame) {
        if (!DOMWindow::allowPopUp(*document().frame()) && !UserGestureIndicator::processingUserGesture())
            return;
        targetFrame = document().frame();
    } else {
        submission->clearTarget();
    }
    if (!targetFrame->page())
        return;

    submission->setReferrer(Referrer(document().outgoingReferrer(), document().referrerPolicy()));
    submission->setOrigin(document().outgoingOrigin());

    targetFrame->navigationScheduler().scheduleFormSubmission(submission);
}

void HTMLFormElement::reset()
{
    LocalFrame* frame = document().frame();
    if (m_isInResetFunction || !frame)
        return;

    m_isInResetFunction = true;

    if (!dispatchEvent(Event::createCancelableBubble(EventTypeNames::reset))) {
        m_isInResetFunction = false;
        return;
    }

    const Vector<FormAssociatedElement*>& elements = associatedElements();
    for (unsigned i = 0; i < elements.size(); ++i) {
        if (elements[i]->isFormControlElement())
            toHTMLFormControlElement(elements[i])->reset();
    }

    m_isInResetFunction = false;
}

void HTMLFormElement::requestAutocomplete()
{
    if (!document().frame() || !shouldAutocomplete() || !UserGestureIndicator::processingUserGesture())
        finishRequestAutocomplete(AutocompleteResultErrorDisabled);
    else
        document().frame()->loader().client()->didRequestAutocomplete(this);
}

void HTMLFormElement::finishRequestAutocomplete(AutocompleteResult result)
{
    RefPtrWillBeRawPtr<Event> event = nullptr;
    if (result == AutocompleteResultSuccess)
        event = Event::createBubble(EventTypeNames::autocomplete);
    else if (result == AutocompleteResultErrorDisabled)
        event = AutocompleteErrorEvent::create("disabled");
    else if (result == AutocompleteResultErrorCancel)
        event = AutocompleteErrorEvent::create("cancel");
    else if (result == AutocompleteResultErrorInvalid)
        event = AutocompleteErrorEvent::create("invalid");
    else
        ASSERT_NOT_REACHED();

    event->setTarget(this);
    m_pendingAutocompleteEvents.append(event.release());

    // Dispatch events later as this API is meant to work asynchronously in all situations and implementations.
    if (!m_requestAutocompleteTimer.isActive())
        m_requestAutocompleteTimer.startOneShot(0, FROM_HERE);
}

void HTMLFormElement::requestAutocompleteTimerFired(Timer<HTMLFormElement>*)
{
    WillBeHeapVector<RefPtrWillBeMember<Event> > pendingEvents;
    m_pendingAutocompleteEvents.swap(pendingEvents);
    for (size_t i = 0; i < pendingEvents.size(); ++i)
        dispatchEvent(pendingEvents[i].release());
}

void HTMLFormElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
    if (name == actionAttr)
        m_attributes.parseAction(value);
    else if (name == targetAttr)
        m_attributes.setTarget(value);
    else if (name == methodAttr)
        m_attributes.updateMethodType(value);
    else if (name == enctypeAttr)
        m_attributes.updateEncodingType(value);
    else if (name == accept_charsetAttr)
        m_attributes.setAcceptCharset(value);
    else if (name == onautocompleteAttr)
        setAttributeEventListener(EventTypeNames::autocomplete, createAttributeEventListener(this, name, value));
    else if (name == onautocompleteerrorAttr)
        setAttributeEventListener(EventTypeNames::autocompleteerror, createAttributeEventListener(this, name, value));
    else
        HTMLElement::parseAttribute(name, value);
}

void HTMLFormElement::associate(FormAssociatedElement& e)
{
    m_associatedElementsAreDirty = true;
    m_associatedElements.clear();
}

void HTMLFormElement::disassociate(FormAssociatedElement& e)
{
    m_associatedElementsAreDirty = true;
    m_associatedElements.clear();
    removeFromPastNamesMap(toHTMLElement(e));
}

bool HTMLFormElement::isURLAttribute(const Attribute& attribute) const
{
    return attribute.name() == actionAttr || HTMLElement::isURLAttribute(attribute);
}

bool HTMLFormElement::hasLegalLinkAttribute(const QualifiedName& name) const
{
    return name == actionAttr || HTMLElement::hasLegalLinkAttribute(name);
}

void HTMLFormElement::associate(HTMLImageElement& e)
{
    m_imageElementsAreDirty = true;
    m_imageElements.clear();
}

void HTMLFormElement::disassociate(HTMLImageElement& e)
{
    m_imageElementsAreDirty = true;
    m_imageElements.clear();
    removeFromPastNamesMap(e);
}

WeakPtr<HTMLFormElement> HTMLFormElement::createWeakPtr()
{
    return m_weakPtrFactory.createWeakPtr();
}

void HTMLFormElement::didAssociateByParser()
{
    if (!m_didFinishParsingChildren)
        return;
    m_hasElementsAssociatedByParser = true;
    UseCounter::count(document(), UseCounter::FormAssociationByParser);
}

PassRefPtr<HTMLCollection> HTMLFormElement::elements()
{
    return ensureCachedHTMLCollection(FormControls);
}

void HTMLFormElement::collectAssociatedElements(Node& root, Vector<FormAssociatedElement*>& elements) const
{
    elements.clear();
    for (HTMLElement* element = Traversal<HTMLElement>::firstWithin(root); element; element = Traversal<HTMLElement>::next(*element)) {
        FormAssociatedElement* associatedElement = 0;
        if (element->isFormControlElement())
            associatedElement = toHTMLFormControlElement(element);
        else if (isHTMLObjectElement(*element))
            associatedElement = toHTMLObjectElement(element);
        else
            continue;
        if (associatedElement->form()== this)
            elements.append(associatedElement);
    }
}

// This function should be const conceptually. However we update some fields
// because of lazy evaluation.
const Vector<FormAssociatedElement*>& HTMLFormElement::associatedElements() const
{
    if (!m_associatedElementsAreDirty)
        return m_associatedElements;
    HTMLFormElement* mutableThis = const_cast<HTMLFormElement*>(this);
    Node* scope = mutableThis;
    if (m_hasElementsAssociatedByParser)
        scope = &highestAncestor();
    if (inDocument() && treeScope().idTargetObserverRegistry().hasObservers(fastGetAttribute(idAttr)))
        scope = &treeScope().rootNode();
    ASSERT(scope);
    collectAssociatedElements(*scope, mutableThis->m_associatedElements);
    mutableThis->m_associatedElementsAreDirty = false;
    return m_associatedElements;
}

void HTMLFormElement::collectImageElements(Node& root, Vector<HTMLImageElement*>& elements)
{
    elements.clear();
    for (HTMLImageElement* image = Traversal<HTMLImageElement>::firstWithin(root); image; image = Traversal<HTMLImageElement>::next(*image)) {
        if (image->formOwner() == this)
            elements.append(image);
    }
}

const Vector<HTMLImageElement*>& HTMLFormElement::imageElements()
{
    if (!m_imageElementsAreDirty)
        return m_imageElements;
    collectImageElements(m_hasElementsAssociatedByParser ? highestAncestor() : *this, m_imageElements);
    m_imageElementsAreDirty = false;
    return m_imageElements;
}

String HTMLFormElement::name() const
{
    return getNameAttribute();
}

bool HTMLFormElement::noValidate() const
{
    return fastHasAttribute(novalidateAttr);
}

// FIXME: This function should be removed because it does not do the same thing as the
// JavaScript binding for action, which treats action as a URL attribute. Last time I
// (Darin Adler) removed this, someone added it back, so I am leaving it in for now.
const AtomicString& HTMLFormElement::action() const
{
    return getAttribute(actionAttr);
}

void HTMLFormElement::setEnctype(const AtomicString& value)
{
    setAttribute(enctypeAttr, value);
}

String HTMLFormElement::method() const
{
    return FormSubmission::Attributes::methodString(m_attributes.method());
}

void HTMLFormElement::setMethod(const AtomicString& value)
{
    setAttribute(methodAttr, value);
}

bool HTMLFormElement::wasUserSubmitted() const
{
    return m_wasUserSubmitted;
}

HTMLFormControlElement* HTMLFormElement::defaultButton() const
{
    const Vector<FormAssociatedElement*>& elements = associatedElements();
    for (unsigned i = 0; i < elements.size(); ++i) {
        if (!elements[i]->isFormControlElement())
            continue;
        HTMLFormControlElement* control = toHTMLFormControlElement(elements[i]);
        if (control->isSuccessfulSubmitButton())
            return control;
    }

    return 0;
}

bool HTMLFormElement::checkValidity()
{
    Vector<RefPtr<FormAssociatedElement> > controls;
    return !checkInvalidControlsAndCollectUnhandled(&controls);
}

bool HTMLFormElement::checkValidityWithoutDispatchingEvents()
{
    return !checkInvalidControlsAndCollectUnhandled(0, HTMLFormControlElement::CheckValidityDispatchEventsNone);
}

bool HTMLFormElement::checkInvalidControlsAndCollectUnhandled(Vector<RefPtr<FormAssociatedElement> >* unhandledInvalidControls, HTMLFormControlElement::CheckValidityDispatchEvents dispatchEvents)
{
    RefPtr<HTMLFormElement> protector(this);
    // Copy associatedElements because event handlers called from
    // HTMLFormControlElement::checkValidity() might change associatedElements.
    const Vector<FormAssociatedElement*>& associatedElements = this->associatedElements();
    Vector<RefPtr<FormAssociatedElement> > elements;
    elements.reserveCapacity(associatedElements.size());
    for (unsigned i = 0; i < associatedElements.size(); ++i)
        elements.append(associatedElements[i]);
    bool hasInvalidControls = false;
    for (unsigned i = 0; i < elements.size(); ++i) {
        if (elements[i]->form() == this && elements[i]->isFormControlElement()) {
            HTMLFormControlElement* control = toHTMLFormControlElement(elements[i].get());
            if (!control->checkValidity(unhandledInvalidControls, dispatchEvents) && control->formOwner() == this)
                hasInvalidControls = true;
        }
    }
    return hasInvalidControls;
}

Element* HTMLFormElement::elementFromPastNamesMap(const AtomicString& pastName)
{
    if (pastName.isEmpty() || !m_pastNamesMap)
        return 0;
    Element* element = m_pastNamesMap->get(pastName);
#if !ASSERT_DISABLED
    if (!element)
        return 0;
    ASSERT_WITH_SECURITY_IMPLICATION(toHTMLElement(element)->formOwner() == this);
    if (isHTMLImageElement(*element)) {
        ASSERT_WITH_SECURITY_IMPLICATION(imageElements().find(element) != kNotFound);
    } else if (isHTMLObjectElement(*element)) {
        ASSERT_WITH_SECURITY_IMPLICATION(associatedElements().find(toHTMLObjectElement(element)) != kNotFound);
    } else {
        ASSERT_WITH_SECURITY_IMPLICATION(associatedElements().find(toHTMLFormControlElement(element)) != kNotFound);
    }
#endif
    return element;
}

void HTMLFormElement::addToPastNamesMap(Element* element, const AtomicString& pastName)
{
    if (pastName.isEmpty())
        return;
    if (!m_pastNamesMap)
        m_pastNamesMap = adoptPtr(new PastNamesMap);
    m_pastNamesMap->set(pastName, element);
}

void HTMLFormElement::removeFromPastNamesMap(HTMLElement& element)
{
    if (!m_pastNamesMap)
        return;
    PastNamesMap::iterator end = m_pastNamesMap->end();
    for (PastNamesMap::iterator it = m_pastNamesMap->begin(); it != end; ++it) {
        if (it->value == &element) {
            it->value = 0;
            // Keep looping. Single element can have multiple names.
        }
    }
}

void HTMLFormElement::getNamedElements(const AtomicString& name, Vector<RefPtr<Element> >& namedItems)
{
    // http://www.whatwg.org/specs/web-apps/current-work/multipage/forms.html#dom-form-nameditem
    elements()->namedItems(name, namedItems);

    Element* elementFromPast = elementFromPastNamesMap(name);
    if (namedItems.size() && namedItems.first() != elementFromPast) {
        addToPastNamesMap(namedItems.first().get(), name);
    } else if (elementFromPast && namedItems.isEmpty()) {
        namedItems.append(elementFromPast);
        UseCounter::count(document(), UseCounter::FormNameAccessForPastNamesMap);
    }
}

bool HTMLFormElement::shouldAutocomplete() const
{
    return !equalIgnoringCase(fastGetAttribute(autocompleteAttr), "off");
}

void HTMLFormElement::finishParsingChildren()
{
    HTMLElement::finishParsingChildren();
    document().formController().restoreControlStateIn(*this);
    m_didFinishParsingChildren = true;
}

void HTMLFormElement::copyNonAttributePropertiesFromElement(const Element& source)
{
    m_wasDemoted = static_cast<const HTMLFormElement&>(source).m_wasDemoted;
    HTMLElement::copyNonAttributePropertiesFromElement(source);
}

void HTMLFormElement::anonymousNamedGetter(const AtomicString& name, bool& returnValue0Enabled, RefPtr<RadioNodeList>& returnValue0, bool& returnValue1Enabled, RefPtr<Element>& returnValue1)
{
    // Call getNamedElements twice, first time check if it has a value
    // and let HTMLFormElement update its cache.
    // See issue: 867404
    {
        Vector<RefPtr<Element> > elements;
        getNamedElements(name, elements);
        if (elements.isEmpty())
            return;
    }

    // Second call may return different results from the first call,
    // but if the first the size cannot be zero.
    Vector<RefPtr<Element> > elements;
    getNamedElements(name, elements);
    ASSERT(!elements.isEmpty());

    if (elements.size() == 1) {
        returnValue1Enabled = true;
        returnValue1 = elements.at(0);
        return;
    }

    bool onlyMatchImg = !elements.isEmpty() && isHTMLImageElement(*elements.first());
    returnValue0Enabled = true;
    returnValue0 = radioNodeList(name, onlyMatchImg);
}

void HTMLFormElement::setDemoted(bool demoted)
{
    if (demoted)
        UseCounter::count(document(), UseCounter::DemotedFormElement);
    m_wasDemoted = demoted;
}

} // namespace
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root/Source/core/html/HTMLFormElement.cpp

DEFINITIONS
