third_party/WebKit/Source/core/dom/custom/V0CustomElementRegistrationContext.cpp

/*
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 *    may be used to endorse or promote products derived from this
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#include "core/dom/custom/V0CustomElementRegistrationContext.h"

#include "bindings/core/v8/ExceptionState.h"
#include "core/HTMLNames.h"
#include "core/SVGNames.h"
#include "core/dom/Document.h"
#include "core/dom/Element.h"
#include "core/dom/custom/V0CustomElement.h"
#include "core/dom/custom/V0CustomElementDefinition.h"
#include "core/dom/custom/V0CustomElementScheduler.h"
#include "core/html/HTMLElement.h"
#include "core/html/HTMLUnknownElement.h"
#include "core/svg/SVGUnknownElement.h"

namespace blink {

V0CustomElementRegistrationContext::V0CustomElementRegistrationContext()
    : m_candidates(V0CustomElementUpgradeCandidateMap::create())
{
}

void V0CustomElementRegistrationContext::registerElement(Document* document, V0CustomElementConstructorBuilder* constructorBuilder, const AtomicString& type, V0CustomElement::NameSet validNames, ExceptionState& exceptionState)
{
    V0CustomElementDefinition* definition = m_registry.registerElement(document, constructorBuilder, type, validNames, exceptionState);

    if (!definition)
        return;

    // Upgrade elements that were waiting for this definition.
    V0CustomElementUpgradeCandidateMap::ElementSet* upgradeCandidates = m_candidates->takeUpgradeCandidatesFor(definition->descriptor());

    if (!upgradeCandidates)
        return;

    for (const auto& candidate : *upgradeCandidates)
        V0CustomElement::define(candidate, definition);
}

Element* V0CustomElementRegistrationContext::createCustomTagElement(Document& document, const QualifiedName& tagName)
{
    DCHECK(V0CustomElement::isValidName(tagName.localName()));

    Element* element;

    if (HTMLNames::xhtmlNamespaceURI == tagName.namespaceURI()) {
        element = HTMLElement::create(tagName, document);
    } else if (SVGNames::svgNamespaceURI == tagName.namespaceURI()) {
        element = SVGUnknownElement::create(tagName, document);
    } else {
        // XML elements are not custom elements, so return early.
        return Element::create(tagName, &document);
    }

    element->setCustomElementState(Element::WaitingForUpgrade);
    resolveOrScheduleResolution(element, nullAtom);
    return element;
}

void V0CustomElementRegistrationContext::didGiveTypeExtension(Element* element, const AtomicString& type)
{
    resolveOrScheduleResolution(element, type);
}

void V0CustomElementRegistrationContext::resolveOrScheduleResolution(Element* element, const AtomicString& typeExtension)
{
    // If an element has a custom tag name it takes precedence over
    // the "is" attribute (if any).
    const AtomicString& type = V0CustomElement::isValidName(element->localName())
        ? element->localName()
        : typeExtension;
    DCHECK(!type.isNull());

    V0CustomElementDescriptor descriptor(type, element->namespaceURI(), element->localName());
    DCHECK_EQ(element->getCustomElementState(), Element::WaitingForUpgrade);

    V0CustomElementScheduler::resolveOrScheduleResolution(this, element, descriptor);
}

void V0CustomElementRegistrationContext::resolve(Element* element, const V0CustomElementDescriptor& descriptor)
{
    V0CustomElementDefinition* definition = m_registry.find(descriptor);
    if (definition) {
        V0CustomElement::define(element, definition);
    } else {
        DCHECK_EQ(element->getCustomElementState(), Element::WaitingForUpgrade);
        m_candidates->add(descriptor, element);
    }
}

void V0CustomElementRegistrationContext::setIsAttributeAndTypeExtension(Element* element, const AtomicString& type)
{
    DCHECK(element);
    DCHECK(!type.isEmpty());
    element->setAttribute(HTMLNames::isAttr, type);
    setTypeExtension(element, type);
}

void V0CustomElementRegistrationContext::setTypeExtension(Element* element, const AtomicString& type)
{
    if (!element->isHTMLElement() && !element->isSVGElement())
        return;

    V0CustomElementRegistrationContext* context = element->document().registrationContext();
    if (!context)
        return;

    if (element->isCustomElement()) {
        // This can happen if:
        // 1. The element has a custom tag, which takes precedence over
        //    type extensions.
        // 2. Undoing a command (eg ReplaceNodeWithSpan) recycles an
        //    element but tries to overwrite its attribute list.
        return;
    }

    // Custom tags take precedence over type extensions
    DCHECK(!V0CustomElement::isValidName(element->localName()));

    if (!V0CustomElement::isValidName(type))
        return;

    element->setCustomElementState(Element::WaitingForUpgrade);
    context->didGiveTypeExtension(element, element->document().convertLocalName(type));
}

DEFINE_TRACE(V0CustomElementRegistrationContext)
{
    visitor->trace(m_candidates);
    visitor->trace(m_registry);
}

} // namespace blink