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/*
* Copyright (C) 2011 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.
* * 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/html/HTMLContentElement.h"
#include "core/HTMLNames.h"
#include "core/css/SelectorChecker.h"
#include "core/css/SiblingTraversalStrategies.h"
#include "core/css/parser/CSSParser.h"
#include "core/dom/QualifiedName.h"
#include "core/dom/shadow/ElementShadow.h"
#include "core/dom/shadow/ShadowRoot.h"
#include "platform/RuntimeEnabledFeatures.h"
namespace blink {
using namespace HTMLNames;
inline HTMLContentElement::HTMLContentElement(Document& document)
: InsertionPoint(contentTag, document)
, m_shouldParseSelect(false)
, m_isValidSelector(true)
{
}
DEFINE_NODE_FACTORY(HTMLContentElement)
HTMLContentElement::~HTMLContentElement()
{
}
void HTMLContentElement::parseSelect()
{
ASSERT(m_shouldParseSelect);
CSSParser parser(CSSParserContext(document(), 0));
parser.parseSelector(m_select, m_selectorList);
m_shouldParseSelect = false;
m_isValidSelector = validateSelect();
if (!m_isValidSelector) {
CSSSelectorList emptyList;
m_selectorList.adopt(emptyList);
}
}
void HTMLContentElement::parseAttribute(const QualifiedName& name, const AtomicString& value)
{
if (name == selectAttr) {
if (ShadowRoot* root = containingShadowRoot())
root->owner()->willAffectSelector();
m_shouldParseSelect = true;
m_select = value;
} else {
InsertionPoint::parseAttribute(name, value);
}
}
static inline bool includesDisallowedPseudoClass(const CSSSelector& selector)
{
if (selector.pseudoType() == CSSSelector::PseudoNot) {
const CSSSelector* subSelector = selector.selectorList()->first();
return subSelector->match() == CSSSelector::PseudoClass;
}
return selector.match() == CSSSelector::PseudoClass;
}
bool HTMLContentElement::validateSelect() const
{
ASSERT(!m_shouldParseSelect);
if (m_select.isNull() || m_select.isEmpty())
return true;
if (!m_selectorList.isValid())
return false;
bool allowAnyPseudoClasses = RuntimeEnabledFeatures::pseudoClassesInMatchingCriteriaInAuthorShadowTreesEnabled() || (containingShadowRoot() && containingShadowRoot()->type() == ShadowRoot::UserAgentShadowRoot);
for (const CSSSelector* selector = m_selectorList.first(); selector; selector = m_selectorList.next(*selector)) {
if (!selector->isCompound())
return false;
if (allowAnyPseudoClasses)
continue;
for (const CSSSelector* subSelector = selector; subSelector; subSelector = subSelector->tagHistory()) {
if (includesDisallowedPseudoClass(*subSelector))
return false;
}
}
return true;
}
static inline bool checkOneSelector(const CSSSelector& selector, const WillBeHeapVector<RawPtrWillBeMember<Node>, 32>& siblings, int nth)
{
Element* element = toElement(siblings[nth]);
SelectorChecker selectorChecker(element->document(), SelectorChecker::QueryingRules);
SelectorChecker::SelectorCheckingContext context(selector, element, SelectorChecker::VisitedMatchEnabled);
ShadowDOMSiblingTraversalStrategy strategy(siblings, nth);
return selectorChecker.match(context, strategy) == SelectorChecker::SelectorMatches;
}
bool HTMLContentElement::matchSelector(const WillBeHeapVector<RawPtrWillBeMember<Node>, 32>& siblings, int nth) const
{
for (const CSSSelector* selector = selectorList().first(); selector; selector = CSSSelectorList::next(*selector)) {
if (checkOneSelector(*selector, siblings, nth))
return true;
}
return false;
}
}
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