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/*
* Copyright (C) 2021 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. AND ITS 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 APPLE INC. OR ITS 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.
*/
#pragma once
#include "PropertyAllowlist.h"
#include "RuleSet.h"
#include "SelectorChecker.h"
#include "StylePropertiesInlines.h"
#include "StyleScopeOrdinal.h"
#include <wtf/Hasher.h>
namespace WebCore::Style {
enum class FromStyleAttribute : bool { No, Yes };
enum class IsCacheable : uint8_t { No, Partially, Yes };
struct MatchedProperties {
Ref<const StyleProperties> properties;
uint8_t linkMatchType { SelectorChecker::MatchAll };
PropertyAllowlist allowlistType { PropertyAllowlist::None };
ScopeOrdinal styleScopeOrdinal { ScopeOrdinal::Element };
FromStyleAttribute fromStyleAttribute { FromStyleAttribute::No };
CascadeLayerPriority cascadeLayerPriority { RuleSet::cascadeLayerPriorityForUnlayered };
IsStartingStyle isStartingStyle { IsStartingStyle::No };
IsCacheable isCacheable { IsCacheable::Yes };
};
struct MatchResult {
WTF_MAKE_STRUCT_FAST_ALLOCATED;
MatchResult(bool isForLink = false)
: isForLink(isForLink)
{ }
bool isForLink { false };
bool isCompletelyNonCacheable { false };
bool hasStartingStyle { false };
Vector<MatchedProperties> userAgentDeclarations;
Vector<MatchedProperties> userDeclarations;
Vector<MatchedProperties> authorDeclarations;
Vector<CSSPropertyID, 4> nonCacheablePropertyIds;
bool isEmpty() const { return userAgentDeclarations.isEmpty() && userDeclarations.isEmpty() && authorDeclarations.isEmpty(); }
friend bool operator==(const MatchResult&, const MatchResult&) = default;
bool cacheablePropertiesEqual(const MatchResult&) const;
};
inline bool operator==(const MatchedProperties& a, const MatchedProperties& b)
{
return a.properties.ptr() == b.properties.ptr()
&& a.linkMatchType == b.linkMatchType
&& a.allowlistType == b.allowlistType
&& a.styleScopeOrdinal == b.styleScopeOrdinal
&& a.fromStyleAttribute == b.fromStyleAttribute
&& a.cascadeLayerPriority == b.cascadeLayerPriority
&& a.isStartingStyle == b.isStartingStyle
&& a.isCacheable == b.isCacheable;
}
inline bool MatchResult::cacheablePropertiesEqual(const MatchResult& other) const
{
if (isForLink != other.isForLink || hasStartingStyle != other.hasStartingStyle)
return false;
// Only author style can be non-cacheable.
if (userAgentDeclarations != other.userAgentDeclarations)
return false;
if (userDeclarations != other.userDeclarations)
return false;
// Currently the cached style contains also the non-cacheable property values from when the entry was made
// so we can only allow styles that override the same exact properties. Content usually animates or varies the same
// small set of properties so this doesn't make a significant difference.
auto nonCacheableEqual = std::ranges::equal(nonCacheablePropertyIds, other.nonCacheablePropertyIds, [](auto& idA, auto& idB) {
// This would need to check the custom property names for equality.
if (idA == CSSPropertyCustom || idB == CSSPropertyCustom)
return false;
return idA == idB;
});
if (!nonCacheableEqual)
return false;
return std::ranges::equal(authorDeclarations, other.authorDeclarations, [](auto& propertiesA, auto& propertiesB) {
if (propertiesA.isCacheable == IsCacheable::Partially && propertiesB.isCacheable == IsCacheable::Partially)
return true;
return propertiesA == propertiesB;
});
}
inline void add(Hasher& hasher, const MatchedProperties& matchedProperties)
{
// Ignore non-cacheable properties when computing hash.
if (matchedProperties.isCacheable == IsCacheable::Partially)
return;
ASSERT(matchedProperties.isCacheable == IsCacheable::Yes);
add(hasher,
matchedProperties.properties.ptr(),
matchedProperties.linkMatchType,
matchedProperties.allowlistType,
matchedProperties.styleScopeOrdinal,
matchedProperties.fromStyleAttribute,
matchedProperties.cascadeLayerPriority,
matchedProperties.isStartingStyle
);
}
inline void add(Hasher& hasher, const MatchResult& matchResult)
{
ASSERT(!matchResult.isCompletelyNonCacheable);
add(hasher, matchResult.isForLink, matchResult.nonCacheablePropertyIds, matchResult.userAgentDeclarations, matchResult.userDeclarations, matchResult.authorDeclarations);
}
}
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