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/*
* Copyright (C) 2008, 2012, 2013, 2014 Apple Inc. All rights reserved.
* Copyright (C) 2009 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:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. 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.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``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 APPLE INC. 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 "CSSSelectorList.h"
#include "CommonAtomStrings.h"
#include "MutableCSSSelector.h"
#include <wtf/TZoneMallocInlines.h>
#include <wtf/text/StringBuilder.h>
namespace WebCore {
WTF_MAKE_TZONE_ALLOCATED_IMPL(CSSSelectorList);
CSSSelectorList::CSSSelectorList(const CSSSelectorList& other)
{
unsigned otherComponentCount = other.componentCount();
if (!otherComponentCount)
return;
m_selectorArray = makeUniqueArray<CSSSelector>(otherComponentCount);
for (unsigned i = 0; i < otherComponentCount; ++i)
new (NotNull, &m_selectorArray[i]) CSSSelector(other.m_selectorArray[i]);
}
CSSSelectorList::CSSSelectorList(MutableCSSSelectorList&& selectorVector)
{
ASSERT_WITH_SECURITY_IMPLICATION(!selectorVector.isEmpty());
size_t flattenedSize = 0;
for (size_t i = 0; i < selectorVector.size(); ++i) {
for (auto* selector = selectorVector[i].get(); selector; selector = selector->tagHistory())
++flattenedSize;
}
ASSERT(flattenedSize);
m_selectorArray = makeUniqueArray<CSSSelector>(flattenedSize);
size_t arrayIndex = 0;
for (size_t i = 0; i < selectorVector.size(); ++i) {
auto* first = selectorVector[i].get();
auto* current = first;
while (current) {
{
// Move item from the parser selector vector into m_selectorArray without invoking destructor (Ugh.)
CSSSelector* currentSelector = current->releaseSelector().release();
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
memcpy(static_cast<void*>(&m_selectorArray[arrayIndex]), static_cast<void*>(currentSelector), sizeof(CSSSelector));
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
// Free the underlying memory without invoking the destructor.
operator delete (currentSelector);
}
if (current != first)
m_selectorArray[arrayIndex].setNotFirstInTagHistory();
current = current->tagHistory();
ASSERT(!m_selectorArray[arrayIndex].isLastInSelectorList() || (flattenedSize == arrayIndex + 1));
if (current)
m_selectorArray[arrayIndex].setNotLastInTagHistory();
++arrayIndex;
}
ASSERT(m_selectorArray[arrayIndex - 1].isLastInTagHistory());
}
ASSERT(flattenedSize == arrayIndex);
m_selectorArray[arrayIndex - 1].setLastInSelectorList();
}
WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN
unsigned CSSSelectorList::componentCount() const
{
if (!m_selectorArray)
return 0;
CSSSelector* current = m_selectorArray.get();
while (!current->isLastInSelectorList())
++current;
return (current - m_selectorArray.get()) + 1;
}
unsigned CSSSelectorList::listSize() const
{
if (!m_selectorArray)
return 0;
unsigned size = 1;
CSSSelector* current = m_selectorArray.get();
while (!current->isLastInSelectorList()) {
if (current->isLastInTagHistory())
++size;
++current;
}
return size;
}
WTF_ALLOW_UNSAFE_BUFFER_USAGE_END
String CSSSelectorList::selectorsText() const
{
StringBuilder result;
buildSelectorsText(result);
return result.toString();
}
void CSSSelectorList::buildSelectorsText(StringBuilder& stringBuilder) const
{
stringBuilder.append(interleave(*this, [](auto& subSelector) { return subSelector.selectorText(); }, ", "_s));
}
template <typename Functor>
static bool forEachTagSelector(Functor& functor, const CSSSelector* selector)
{
ASSERT(selector);
do {
if (functor(selector))
return true;
if (const CSSSelectorList* selectorList = selector->selectorList()) {
for (const auto& subSelector : *selectorList) {
if (forEachTagSelector(functor, &subSelector))
return true;
}
}
} while ((selector = selector->tagHistory()));
return false;
}
template <typename Functor>
static bool forEachSelector(Functor& functor, const CSSSelectorList& selectorList)
{
for (const auto& selector : selectorList) {
if (forEachTagSelector(functor, &selector))
return true;
}
return false;
}
bool CSSSelectorList::hasExplicitNestingParent() const
{
auto functor = [](auto* selector) {
return selector->hasExplicitNestingParent();
};
return forEachSelector(functor, *this);
}
bool CSSSelectorList::hasOnlyNestingSelector() const
{
if (componentCount() != 1)
return false;
auto singleSelector = first();
if (!singleSelector)
return false;
// Selector should be a single selector
if (singleSelector->tagHistory())
return false;
return singleSelector->match() == CSSSelector::Match::NestingParent;
}
} // namespace WebCore
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