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/*
* Copyright (C) 2023 Apple 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 "StyleCustomPropertyData.h"
namespace WebCore {
static constexpr auto maximumAncestorCount = 4;
StyleCustomPropertyData::StyleCustomPropertyData(const StyleCustomPropertyData& other)
: m_size(other.m_size)
, m_mayHaveAnimatableProperties(other.m_mayHaveAnimatableProperties)
{
auto shouldReferenceAsParentValues = [&] {
// Always reference the root style since it likely gets shared a lot.
if (!other.m_parentValues && !other.m_ownValues.isEmpty())
return true;
// Limit the list length.
if (other.m_ancestorCount >= maximumAncestorCount)
return false;
// If the number of properties is small we just copy them to avoid creating unnecessarily long linked lists.
static constexpr auto parentReferencePropertyCountThreshold = 8;
return other.m_ownValues.size() > parentReferencePropertyCountThreshold;
}();
// If there are mutations on multiple levels this constructs a linked list of property data objects.
if (shouldReferenceAsParentValues)
m_parentValues = &other;
else {
m_parentValues = other.m_parentValues;
m_ownValues = other.m_ownValues;
}
if (m_parentValues)
m_ancestorCount = m_parentValues->m_ancestorCount + 1;
#if ASSERT_ENABLED
if (m_parentValues)
m_parentValues->m_hasChildren = true;
#endif
}
const CSSCustomPropertyValue* StyleCustomPropertyData::get(const AtomString& name) const
{
for (auto* propertyData = this; propertyData; propertyData = propertyData->m_parentValues.get()) {
if (auto* value = propertyData->m_ownValues.get(name))
return value;
}
return nullptr;
}
void StyleCustomPropertyData::set(const AtomString& name, Ref<const CSSCustomPropertyValue>&& value)
{
ASSERT(!m_hasChildren);
ASSERT([&] {
auto* existing = get(name);
return !existing || !existing->equals(value);
}());
m_mayHaveAnimatableProperties = m_mayHaveAnimatableProperties || value->isAnimatable();
auto addResult = m_ownValues.set(name, WTFMove(value));
bool isNewProperty = addResult.isNewEntry && (!m_parentValues || !m_parentValues->get(name));
if (isNewProperty)
++m_size;
}
bool StyleCustomPropertyData::operator==(const StyleCustomPropertyData& other) const
{
if (m_size != other.m_size)
return false;
if (m_parentValues == other.m_parentValues) {
// This relies on the values in m_ownValues never being equal to those in m_parentValues.
if (m_ownValues.size() != other.m_ownValues.size())
return false;
for (auto& entry : m_ownValues) {
auto* otherValue = other.m_ownValues.get(entry.key);
if (!otherValue || !entry.value->equals(*otherValue))
return false;
}
return true;
}
bool isEqual = true;
forEachInternal([&](auto& entry) {
auto* otherValue = other.get(entry.key);
if (!otherValue || !entry.value->equals(*otherValue)) {
isEqual = false;
return IterationStatus::Done;
}
return IterationStatus::Continue;
});
return isEqual;
}
template<typename Callback>
void StyleCustomPropertyData::forEachInternal(Callback&& callback) const
{
Vector<const StyleCustomPropertyData*, maximumAncestorCount> descendants;
auto isOverridenByDescendants = [&](auto& key) {
for (auto* descendant : descendants) {
if (descendant->m_ownValues.contains(key))
return true;
}
return false;
};
auto* propertyData = this;
while (true) {
for (auto& entry : propertyData->m_ownValues) {
if (isOverridenByDescendants(entry.key))
continue;
auto status = callback(entry);
if (status == IterationStatus::Done)
return;
}
if (!propertyData->m_parentValues)
return;
descendants.append(propertyData);
propertyData = propertyData->m_parentValues.get();
}
}
void StyleCustomPropertyData::forEach(NOESCAPE const Function<IterationStatus(const KeyValuePair<AtomString, RefPtr<const CSSCustomPropertyValue>>&)>& callback) const
{
forEachInternal(callback);
}
AtomString StyleCustomPropertyData::findKeyAtIndex(unsigned index) const
{
unsigned currentIndex = 0;
AtomString key;
forEachInternal([&](auto& entry) {
if (currentIndex == index) {
key = entry.key;
return IterationStatus::Done;
}
++currentIndex;
return IterationStatus::Continue;
});
return key;
}
#if !LOG_DISABLED
void StyleCustomPropertyData::dumpDifferences(TextStream& ts, const StyleCustomPropertyData& other) const
{
if (*this != other)
ts << "custom properies differ\n";
}
#endif // !LOG_DISABLED
} // namespace WebCore
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