Home | History | Annotate | Download | only in dom 
      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/CustomElementRegistrationContext.h"
     33 
     34 #include "HTMLNames.h"
     35 #include "SVGNames.h"
     36 #include "bindings/v8/ExceptionState.h"
     37 #include "core/dom/CustomElement.h"
     38 #include "core/dom/CustomElementDefinition.h"
     39 #include "core/dom/Element.h"
     40 #include "core/html/HTMLElement.h"
     41 #include "core/html/HTMLUnknownElement.h"
     42 #include "core/svg/SVGUnknownElement.h"
     43 #include "wtf/RefPtr.h"
     44 
     45 namespace WebCore {
     46 
     47 void CustomElementRegistrationContext::registerElement(Document* document, CustomElementConstructorBuilder* constructorBuilder, const AtomicString& type, CustomElement::NameSet validNames, ExceptionState& es)
     48 {
     49     CustomElementDefinition* definition = m_registry.registerElement(document, constructorBuilder, type, validNames, es);
     50 
     51     if (!definition)
     52         return;
     53 
     54     // Upgrade elements that were waiting for this definition.
     55     const CustomElementUpgradeCandidateMap::ElementSet& upgradeCandidates = m_candidates.takeUpgradeCandidatesFor(definition->descriptor());
     56     for (CustomElementUpgradeCandidateMap::ElementSet::const_iterator it = upgradeCandidates.begin(); it != upgradeCandidates.end(); ++it)
     57         didResolveElement(definition, *it);
     58 }
     59 
     60 PassRefPtr<Element> CustomElementRegistrationContext::createCustomTagElement(Document* document, const QualifiedName& tagName)
     61 {
     62     ASSERT(CustomElement::isValidName(tagName.localName()));
     63 
     64     if (!document)
     65         return 0;
     66 
     67     RefPtr<Element> element;
     68 
     69     if (HTMLNames::xhtmlNamespaceURI == tagName.namespaceURI()) {
     70         element = HTMLElement::create(tagName, document);
     71     } else if (SVGNames::svgNamespaceURI == tagName.namespaceURI()) {
     72         element = SVGUnknownElement::create(tagName, document);
     73     } else {
     74         // XML elements are not custom elements, so return early.
     75         return Element::create(tagName, document);
     76     }
     77 
     78     resolve(element.get(), nullAtom);
     79     return element.release();
     80 }
     81 
     82 void CustomElementRegistrationContext::didGiveTypeExtension(Element* element, const AtomicString& type)
     83 {
     84     resolve(element, type);
     85 }
     86 
     87 void CustomElementRegistrationContext::resolve(Element* element, const AtomicString& typeExtension)
     88 {
     89     // If an element has a custom tag name it takes precedence over
     90     // the "is" attribute (if any).
     91     const AtomicString& type = CustomElement::isValidName(element->localName())
     92         ? element->localName()
     93         : typeExtension;
     94     ASSERT(!type.isNull());
     95 
     96     CustomElementDescriptor descriptor(type, element->namespaceURI(), element->localName());
     97     CustomElementDefinition* definition = m_registry.find(descriptor);
     98     if (definition)
     99         didResolveElement(definition, element);
    100     else
    101         didCreateUnresolvedElement(descriptor, element);
    102 }
    103 
    104 void CustomElementRegistrationContext::didResolveElement(CustomElementDefinition* definition, Element* element)
    105 {
    106     CustomElement::define(element, definition);
    107 }
    108 
    109 void CustomElementRegistrationContext::didCreateUnresolvedElement(const CustomElementDescriptor& descriptor, Element* element)
    110 {
    111     m_candidates.add(descriptor, element);
    112 }
    113 
    114 void CustomElementRegistrationContext::customElementWasDestroyed(Element* element)
    115 {
    116     m_candidates.remove(element);
    117 }
    118 
    119 PassRefPtr<CustomElementRegistrationContext> CustomElementRegistrationContext::create()
    120 {
    121     return adoptRef(new CustomElementRegistrationContext());
    122 }
    123 
    124 void CustomElementRegistrationContext::setIsAttributeAndTypeExtension(Element* element, const AtomicString& type)
    125 {
    126     ASSERT(element);
    127     ASSERT(!type.isEmpty());
    128     element->setAttribute(HTMLNames::isAttr, type);
    129     setTypeExtension(element, type);
    130 }
    131 
    132 void CustomElementRegistrationContext::setTypeExtension(Element* element, const AtomicString& type)
    133 {
    134     if (!element->isHTMLElement() && !element->isSVGElement())
    135         return;
    136 
    137     if (element->isCustomElement()) {
    138         // This can happen if:
    139         // 1. The element has a custom tag, which takes precedence over
    140         //    type extensions.
    141         // 2. Undoing a command (eg ReplaceNodeWithSpan) recycles an
    142         //    element but tries to overwrite its attribute list.
    143         return;
    144     }
    145 
    146     // Custom tags take precedence over type extensions
    147     ASSERT(!CustomElement::isValidName(element->localName()));
    148 
    149     if (CustomElementRegistrationContext* context = element->document()->registrationContext())
    150         context->didGiveTypeExtension(element, type);
    151 }
    152 
    153 } // namespace WebCore
    154