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      1 /*
      2  * Copyright (C) 2012 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/CustomElementRegistry.h"
     33 
     34 #include "bindings/v8/CustomElementConstructorBuilder.h"
     35 #include "core/HTMLNames.h"
     36 #include "core/SVGNames.h"
     37 #include "core/dom/DocumentLifecycleObserver.h"
     38 #include "core/dom/custom/CustomElementException.h"
     39 #include "core/dom/custom/CustomElementRegistrationContext.h"
     40 
     41 namespace WebCore {
     42 
     43 class RegistrationContextObserver : public DocumentLifecycleObserver {
     44 public:
     45     explicit RegistrationContextObserver(Document* document)
     46         : DocumentLifecycleObserver(document)
     47         , m_wentAway(!document)
     48     {
     49     }
     50 
     51     bool registrationContextWentAway() { return m_wentAway; }
     52 
     53 private:
     54 #if ENABLE(OILPAN)
     55     // In oilpan we don't have the disposed phase for context lifecycle observer.
     56     virtual void documentWasDetached() OVERRIDE { m_wentAway = true; }
     57 #else
     58     virtual void documentWasDisposed() OVERRIDE { m_wentAway = true; }
     59 #endif
     60 
     61     bool m_wentAway;
     62 };
     63 
     64 CustomElementDefinition* CustomElementRegistry::registerElement(Document* document, CustomElementConstructorBuilder* constructorBuilder, const AtomicString& userSuppliedName, CustomElement::NameSet validNames, ExceptionState& exceptionState)
     65 {
     66     // FIXME: In every instance except one it is the
     67     // CustomElementConstructorBuilder that observes document
     68     // destruction during registration. This responsibility should be
     69     // consolidated in one place.
     70     RegistrationContextObserver observer(document);
     71 
     72     AtomicString type = userSuppliedName.lower();
     73 
     74     if (!constructorBuilder->isFeatureAllowed()) {
     75         CustomElementException::throwException(CustomElementException::CannotRegisterFromExtension, type, exceptionState);
     76         return 0;
     77     }
     78 
     79     if (!CustomElement::isValidName(type, validNames)) {
     80         CustomElementException::throwException(CustomElementException::InvalidName, type, exceptionState);
     81         return 0;
     82     }
     83 
     84     QualifiedName tagName = QualifiedName::null();
     85     if (!constructorBuilder->validateOptions(type, tagName, exceptionState))
     86         return 0;
     87 
     88     ASSERT(tagName.namespaceURI() == HTMLNames::xhtmlNamespaceURI || tagName.namespaceURI() == SVGNames::svgNamespaceURI);
     89 
     90     // FIXME: This should be done earlier in validateOptions.
     91     if (m_registeredTypeNames.contains(type)) {
     92         CustomElementException::throwException(CustomElementException::TypeAlreadyRegistered, type, exceptionState);
     93         return 0;
     94     }
     95 
     96     ASSERT(!observer.registrationContextWentAway());
     97 
     98     RefPtr<CustomElementLifecycleCallbacks> lifecycleCallbacks = constructorBuilder->createCallbacks();
     99 
    100     // Consulting the constructor builder could execute script and
    101     // kill the document.
    102     if (observer.registrationContextWentAway()) {
    103         CustomElementException::throwException(CustomElementException::ContextDestroyedCreatingCallbacks, type, exceptionState);
    104         return 0;
    105     }
    106 
    107     const CustomElementDescriptor descriptor(type, tagName.namespaceURI(), tagName.localName());
    108     RefPtr<CustomElementDefinition> definition = CustomElementDefinition::create(descriptor, lifecycleCallbacks);
    109 
    110     if (!constructorBuilder->createConstructor(document, definition.get(), exceptionState))
    111         return 0;
    112 
    113     m_definitions.add(descriptor, definition);
    114     m_registeredTypeNames.add(descriptor.type());
    115 
    116     if (!constructorBuilder->didRegisterDefinition(definition.get())) {
    117         CustomElementException::throwException(CustomElementException::ContextDestroyedRegisteringDefinition, type, exceptionState);
    118         return 0;
    119     }
    120 
    121     return definition.get();
    122 }
    123 
    124 CustomElementDefinition* CustomElementRegistry::find(const CustomElementDescriptor& descriptor) const
    125 {
    126     return m_definitions.get(descriptor);
    127 }
    128 
    129 } // namespace WebCore
    130