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      1 /*
      2  * Copyright (C) 2013 Google Inc. All rights reserved.
      3  *
      4  * Redistribution and use in source and binary forms, with or without
      5  * modification, are permitted provided that the following conditions
      6  * are met:
      7  *
      8  * 1. Redistributions of source code must retain the above copyright
      9  *    notice, this list of conditions and the following disclaimer.
     10  * 2. Redistributions in binary form must reproduce the above copyright
     11  *    notice, this list of conditions and the following disclaimer
     12  *    in the documentation and/or other materials provided with the
     13  *    distribution.
     14  * 3. Neither the name of Google Inc. nor the names of its contributors
     15  *    may be used to endorse or promote products derived from this
     16  *    software without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     19  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     20  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     21  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     22  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     23  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     24  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     25  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     26  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     27  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     28  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     29  */
     30 
     31 #include "config.h"
     32 #include "core/dom/custom/CustomElementRegistrationContext.h"
     33 
     34 #include "HTMLNames.h"
     35 #include "SVGNames.h"
     36 #include "bindings/v8/ExceptionState.h"
     37 #include "core/dom/Element.h"
     38 #include "core/dom/custom/CustomElement.h"
     39 #include "core/dom/custom/CustomElementCallbackScheduler.h"
     40 #include "core/dom/custom/CustomElementDefinition.h"
     41 #include "core/html/HTMLElement.h"
     42 #include "core/html/HTMLUnknownElement.h"
     43 #include "core/svg/SVGUnknownElement.h"
     44 #include "wtf/RefPtr.h"
     45 
     46 namespace WebCore {
     47 
     48 void CustomElementRegistrationContext::registerElement(Document* document, CustomElementConstructorBuilder* constructorBuilder, const AtomicString& type, CustomElement::NameSet validNames, ExceptionState& exceptionState)
     49 {
     50     CustomElementDefinition* definition = m_registry.registerElement(document, constructorBuilder, type, validNames, exceptionState);
     51 
     52     if (!definition)
     53         return;
     54 
     55     // Upgrade elements that were waiting for this definition.
     56     const CustomElementUpgradeCandidateMap::ElementSet& upgradeCandidates = m_candidates.takeUpgradeCandidatesFor(definition->descriptor());
     57     for (CustomElementUpgradeCandidateMap::ElementSet::const_iterator it = upgradeCandidates.begin(); it != upgradeCandidates.end(); ++it)
     58         didResolveElement(definition, *it);
     59 }
     60 
     61 PassRefPtr<Element> CustomElementRegistrationContext::createCustomTagElement(Document& document, const QualifiedName& tagName)
     62 {
     63     ASSERT(CustomElement::isValidName(tagName.localName()));
     64 
     65     RefPtr<Element> element;
     66 
     67     if (HTMLNames::xhtmlNamespaceURI == tagName.namespaceURI()) {
     68         element = HTMLElement::create(tagName, document);
     69     } else if (SVGNames::svgNamespaceURI == tagName.namespaceURI()) {
     70         element = SVGUnknownElement::create(tagName, document);
     71     } else {
     72         // XML elements are not custom elements, so return early.
     73         return Element::create(tagName, &document);
     74     }
     75 
     76     element->setCustomElementState(Element::WaitingForUpgrade);
     77     resolve(element.get(), nullAtom);
     78     return element.release();
     79 }
     80 
     81 void CustomElementRegistrationContext::didGiveTypeExtension(Element* element, const AtomicString& type)
     82 {
     83     resolve(element, type);
     84 }
     85 
     86 void CustomElementRegistrationContext::resolve(Element* element, const AtomicString& typeExtension)
     87 {
     88     // If an element has a custom tag name it takes precedence over
     89     // the "is" attribute (if any).
     90     const AtomicString& type = CustomElement::isValidName(element->localName())
     91         ? element->localName()
     92         : typeExtension;
     93     ASSERT(!type.isNull());
     94 
     95     CustomElementDescriptor descriptor(type, element->namespaceURI(), element->localName());
     96     CustomElementDefinition* definition = m_registry.find(descriptor);
     97     if (definition)
     98         didResolveElement(definition, element);
     99     else
    100         didCreateUnresolvedElement(descriptor, element);
    101 }
    102 
    103 void CustomElementRegistrationContext::didResolveElement(CustomElementDefinition* definition, Element* element)
    104 {
    105     CustomElement::define(element, definition);
    106 }
    107 
    108 void CustomElementRegistrationContext::didCreateUnresolvedElement(const CustomElementDescriptor& descriptor, Element* element)
    109 {
    110     ASSERT(element->customElementState() == Element::WaitingForUpgrade);
    111     m_candidates.add(descriptor, element);
    112 }
    113 
    114 PassRefPtr<CustomElementRegistrationContext> CustomElementRegistrationContext::create()
    115 {
    116     return adoptRef(new CustomElementRegistrationContext());
    117 }
    118 
    119 void CustomElementRegistrationContext::setIsAttributeAndTypeExtension(Element* element, const AtomicString& type)
    120 {
    121     ASSERT(element);
    122     ASSERT(!type.isEmpty());
    123     element->setAttribute(HTMLNames::isAttr, type);
    124     setTypeExtension(element, type);
    125 }
    126 
    127 void CustomElementRegistrationContext::setTypeExtension(Element* element, const AtomicString& type)
    128 {
    129     if (!element->isHTMLElement() && !element->isSVGElement())
    130         return;
    131 
    132     if (element->isCustomElement()) {
    133         // This can happen if:
    134         // 1. The element has a custom tag, which takes precedence over
    135         //    type extensions.
    136         // 2. Undoing a command (eg ReplaceNodeWithSpan) recycles an
    137         //    element but tries to overwrite its attribute list.
    138         return;
    139     }
    140 
    141     // Custom tags take precedence over type extensions
    142     ASSERT(!CustomElement::isValidName(element->localName()));
    143 
    144     element->setCustomElementState(Element::WaitingForUpgrade);
    145 
    146     if (CustomElementRegistrationContext* context = element->document().registrationContext())
    147         context->didGiveTypeExtension(element, type);
    148 }
    149 
    150 } // namespace WebCore
    151