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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 "CSSCounterStyleRegistry.h"
#include "CSSCounterStyle.h"
#include "CSSPrimitiveValue.h"
#include "CSSValuePair.h"
#include "ListStyleType.h"
#include <wtf/NeverDestroyed.h>
namespace WebCore {
DEFINE_ALLOCATOR_WITH_HEAP_IDENTIFIER(CSSCounterStyleRegistry);
void CSSCounterStyleRegistry::resolveUserAgentReferences()
{
for (auto& [name, counter] : userAgentCounterStyles()) {
// decimal counter has no fallback or extended references because it is the last resource for both cases.
if (counter->name() == "decimal"_s)
continue;
if (counter->isFallbackUnresolved())
resolveFallbackReference(*counter);
if (counter->isExtendsSystem() && counter->isExtendsUnresolved())
resolveExtendsReference(*counter);
}
}
void CSSCounterStyleRegistry::resolveReferencesIfNeeded()
{
if (!m_hasUnresolvedReferences)
return;
for (auto& [name, counter] : m_authorCounterStyles) {
if (counter->isFallbackUnresolved())
resolveFallbackReference(*counter, &m_authorCounterStyles);
if (counter->isExtendsSystem() && counter->isExtendsUnresolved())
resolveExtendsReference(*counter, &m_authorCounterStyles);
}
m_hasUnresolvedReferences = false;
}
void CSSCounterStyleRegistry::resolveExtendsReference(CSSCounterStyle& counterStyle, CounterStyleMap* map)
{
UncheckedKeyHashSet<CSSCounterStyle*> countersInChain;
resolveExtendsReference(counterStyle, countersInChain, map);
}
void CSSCounterStyleRegistry::resolveExtendsReference(CSSCounterStyle& counter, UncheckedKeyHashSet<CSSCounterStyle*>& countersInChain, CounterStyleMap* map)
{
ASSERT(counter.isExtendsSystem() && counter.isExtendsUnresolved());
if (!(counter.isExtendsSystem() && counter.isExtendsUnresolved()))
return;
if (countersInChain.contains(&counter)) {
// Chain of references forms a circle. Treat all as extending decimal (https://www.w3.org/TR/css-counter-styles-3/#extends-system).
auto decimal = decimalCounter();
for (const RefPtr counterInChain : countersInChain) {
ASSERT(counterInChain);
if (!counterInChain)
continue;
counterInChain->extendAndResolve(*decimal);
}
// Recursion return for circular chain.
return;
}
countersInChain.add(&counter);
auto extendedCounter = counterStyle(counter.extendsName(), map);
ASSERT(extendedCounter);
if (!extendedCounter)
return;
if (extendedCounter->isExtendsSystem() && extendedCounter->isExtendsUnresolved())
resolveExtendsReference(*extendedCounter, countersInChain, map);
// Recursion return for non-circular chain. Calling resolveExtendsReference() for the extendedCounter might have already resolved this counter style if a circle was formed. If it is still unresolved, it should get resolved here.
if (counter.isExtendsUnresolved())
counter.extendAndResolve(*extendedCounter);
}
void CSSCounterStyleRegistry::resolveFallbackReference(CSSCounterStyle& counter, CounterStyleMap* map)
{
counter.setFallbackReference(counterStyle(counter.fallbackName(), map));
}
void CSSCounterStyleRegistry::addCounterStyle(const CSSCounterStyleDescriptors& descriptors)
{
m_hasUnresolvedReferences = true;
m_authorCounterStyles.set(descriptors.m_name, CSSCounterStyle::create(descriptors, false));
}
void CSSCounterStyleRegistry::addUserAgentCounterStyle(const CSSCounterStyleDescriptors& descriptors)
{
userAgentCounterStyles().set(descriptors.m_name, CSSCounterStyle::create(descriptors, true));
}
RefPtr<CSSCounterStyle> CSSCounterStyleRegistry::decimalCounter()
{
auto& userAgentCounters = userAgentCounterStyles();
auto iterator = userAgentCounters.find("decimal"_s);
if (iterator != userAgentCounters.end())
return iterator->value.get();
// user agent counter style should always be populated with a counter named decimal if counter-style-at-rule is enabled
return nullptr;
}
// A valid map means that the search begins at the author counter style map, otherwise we skip the search to the UA counter styles.
RefPtr<CSSCounterStyle> CSSCounterStyleRegistry::counterStyle(const AtomString& name, CounterStyleMap* map)
{
if (name.isEmpty())
return decimalCounter();
auto getCounter = [&](const AtomString& counterName, const CounterStyleMap& map) {
auto counterIterator = map.find(counterName);
return counterIterator != map.end() ? counterIterator->value : nullptr;
};
// If there is a map, the search starts from the given map.
if (map) {
if (RefPtr counter = getCounter(name, *map))
return counter;
}
// If there was no map (called for user-agent references resolution), or the counter was not found in the given map, we search at the user-agent map.
auto userAgentCounter = getCounter(name, userAgentCounterStyles());
return userAgentCounter ? userAgentCounter : decimalCounter();
}
RefPtr<CSSCounterStyle> CSSCounterStyleRegistry::resolvedCounterStyle(const ListStyleType& listStyleType)
{
if (listStyleType.type != ListStyleType::Type::CounterStyle)
return nullptr;
resolveReferencesIfNeeded();
return counterStyle(listStyleType.identifier, &m_authorCounterStyles);
}
CounterStyleMap& CSSCounterStyleRegistry::userAgentCounterStyles()
{
static NeverDestroyed<CounterStyleMap> counters;
return counters;
}
bool CSSCounterStyleRegistry::operator==(const CSSCounterStyleRegistry& other) const
{
// Intentionally doesn't check m_hasUnresolvedReferences.
return m_authorCounterStyles == other.m_authorCounterStyles;
}
void CSSCounterStyleRegistry::clearAuthorCounterStyles()
{
if (m_authorCounterStyles.isEmpty())
return;
m_authorCounterStyles.clear();
invalidate();
}
void CSSCounterStyleRegistry::invalidate()
{
m_hasUnresolvedReferences = true;
}
}
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