| /* |
| * Copyright (C) 2013 Google Inc. All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include "config.h" |
| #include "core/dom/ElementData.h" |
| |
| #include "core/css/StylePropertySet.h" |
| #include "core/dom/Attr.h" |
| #include "core/dom/QualifiedName.h" |
| #include "wtf/Vector.h" |
| |
| namespace WebCore { |
| |
| struct SameSizeAsElementData : public RefCounted<SameSizeAsElementData> { |
| unsigned bitfield; |
| void* refPtrs[3]; |
| }; |
| |
| COMPILE_ASSERT(sizeof(ElementData) == sizeof(SameSizeAsElementData), element_attribute_data_should_stay_small); |
| |
| static size_t sizeForShareableElementDataWithAttributeCount(unsigned count) |
| { |
| return sizeof(ShareableElementData) + sizeof(Attribute) * count; |
| } |
| |
| ElementData::ElementData() |
| : m_isUnique(true) |
| , m_arraySize(0) |
| , m_presentationAttributeStyleIsDirty(false) |
| , m_styleAttributeIsDirty(false) |
| , m_animatedSVGAttributesAreDirty(false) |
| { |
| } |
| |
| ElementData::ElementData(unsigned arraySize) |
| : m_isUnique(false) |
| , m_arraySize(arraySize) |
| , m_presentationAttributeStyleIsDirty(false) |
| , m_styleAttributeIsDirty(false) |
| , m_animatedSVGAttributesAreDirty(false) |
| { |
| } |
| |
| ElementData::ElementData(const ElementData& other, bool isUnique) |
| : m_isUnique(isUnique) |
| , m_arraySize(isUnique ? 0 : other.length()) |
| , m_presentationAttributeStyleIsDirty(other.m_presentationAttributeStyleIsDirty) |
| , m_styleAttributeIsDirty(other.m_styleAttributeIsDirty) |
| , m_animatedSVGAttributesAreDirty(other.m_animatedSVGAttributesAreDirty) |
| , m_classNames(other.m_classNames) |
| , m_idForStyleResolution(other.m_idForStyleResolution) |
| { |
| // NOTE: The inline style is copied by the subclass copy constructor since we don't know what to do with it here. |
| } |
| |
| void ElementData::destroy() |
| { |
| if (m_isUnique) |
| delete static_cast<UniqueElementData*>(this); |
| else |
| delete static_cast<ShareableElementData*>(this); |
| } |
| |
| PassRefPtr<UniqueElementData> ElementData::makeUniqueCopy() const |
| { |
| if (isUnique()) |
| return adoptRef(new UniqueElementData(static_cast<const UniqueElementData&>(*this))); |
| return adoptRef(new UniqueElementData(static_cast<const ShareableElementData&>(*this))); |
| } |
| |
| bool ElementData::isEquivalent(const ElementData* other) const |
| { |
| if (!other) |
| return isEmpty(); |
| |
| unsigned len = length(); |
| if (len != other->length()) |
| return false; |
| |
| for (unsigned i = 0; i < len; i++) { |
| const Attribute* attribute = attributeItem(i); |
| const Attribute* otherAttr = other->getAttributeItem(attribute->name()); |
| if (!otherAttr || attribute->value() != otherAttr->value()) |
| return false; |
| } |
| |
| return true; |
| } |
| |
| size_t ElementData::getAttrIndex(Attr* attr) const |
| { |
| // This relies on the fact that Attr's QualifiedName == the Attribute's name. |
| for (unsigned i = 0; i < length(); ++i) { |
| if (attributeItem(i)->name() == attr->qualifiedName()) |
| return i; |
| } |
| return kNotFound; |
| } |
| |
| size_t ElementData::getAttributeItemIndexSlowCase(const AtomicString& name, bool shouldIgnoreAttributeCase) const |
| { |
| // Continue to checking case-insensitively and/or full namespaced names if necessary: |
| for (unsigned i = 0; i < length(); ++i) { |
| const Attribute* attribute = attributeItem(i); |
| // FIXME: Why check the prefix? Namespace is all that should matter |
| // and all HTML/SVG attributes have a null namespace! |
| if (!attribute->name().hasPrefix()) { |
| if (shouldIgnoreAttributeCase && equalIgnoringCase(name, attribute->localName())) |
| return i; |
| } else { |
| // FIXME: Would be faster to do this comparison without calling toString, which |
| // generates a temporary string by concatenation. But this branch is only reached |
| // if the attribute name has a prefix, which is rare in HTML. |
| if (equalPossiblyIgnoringCase(name, attribute->name().toString(), shouldIgnoreAttributeCase)) |
| return i; |
| } |
| } |
| return kNotFound; |
| } |
| |
| ShareableElementData::ShareableElementData(const Vector<Attribute>& attributes) |
| : ElementData(attributes.size()) |
| { |
| for (unsigned i = 0; i < m_arraySize; ++i) |
| new (&m_attributeArray[i]) Attribute(attributes[i]); |
| } |
| |
| ShareableElementData::~ShareableElementData() |
| { |
| for (unsigned i = 0; i < m_arraySize; ++i) |
| m_attributeArray[i].~Attribute(); |
| } |
| |
| ShareableElementData::ShareableElementData(const UniqueElementData& other) |
| : ElementData(other, false) |
| { |
| ASSERT(!other.m_presentationAttributeStyle); |
| |
| if (other.m_inlineStyle) { |
| m_inlineStyle = other.m_inlineStyle->immutableCopyIfNeeded(); |
| } |
| |
| for (unsigned i = 0; i < m_arraySize; ++i) |
| new (&m_attributeArray[i]) Attribute(other.m_attributeVector.at(i)); |
| } |
| |
| PassRefPtr<ShareableElementData> ShareableElementData::createWithAttributes(const Vector<Attribute>& attributes) |
| { |
| void* slot = WTF::fastMalloc(sizeForShareableElementDataWithAttributeCount(attributes.size())); |
| return adoptRef(new (slot) ShareableElementData(attributes)); |
| } |
| |
| UniqueElementData::UniqueElementData() |
| { |
| } |
| |
| UniqueElementData::UniqueElementData(const UniqueElementData& other) |
| : ElementData(other, true) |
| , m_presentationAttributeStyle(other.m_presentationAttributeStyle) |
| , m_attributeVector(other.m_attributeVector) |
| { |
| m_inlineStyle = other.m_inlineStyle ? other.m_inlineStyle->mutableCopy() : 0; |
| } |
| |
| UniqueElementData::UniqueElementData(const ShareableElementData& other) |
| : ElementData(other, true) |
| { |
| // An ShareableElementData should never have a mutable inline StylePropertySet attached. |
| ASSERT(!other.m_inlineStyle || !other.m_inlineStyle->isMutable()); |
| m_inlineStyle = other.m_inlineStyle; |
| |
| m_attributeVector.reserveCapacity(other.length()); |
| for (unsigned i = 0; i < other.length(); ++i) |
| m_attributeVector.uncheckedAppend(other.m_attributeArray[i]); |
| } |
| |
| PassRefPtr<UniqueElementData> UniqueElementData::create() |
| { |
| return adoptRef(new UniqueElementData); |
| } |
| |
| PassRefPtr<ShareableElementData> UniqueElementData::makeShareableCopy() const |
| { |
| void* slot = WTF::fastMalloc(sizeForShareableElementDataWithAttributeCount(m_attributeVector.size())); |
| return adoptRef(new (slot) ShareableElementData(*this)); |
| } |
| |
| Attribute* UniqueElementData::getAttributeItem(const QualifiedName& name) |
| { |
| for (unsigned i = 0; i < length(); ++i) { |
| if (m_attributeVector.at(i).name().matches(name)) |
| return &m_attributeVector.at(i); |
| } |
| return 0; |
| } |
| |
| } // namespace WebCore |