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/*
* Copyright (C) 2025 Apple Inc. All rights reserved.
* Copyright (C) 2025 Samuel Weinig <sam@webkit.org>
*
* 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 "CSSFunctionValue.h"
#include "CSSValueList.h"
#include "CSSValuePair.h"
#include "StyleBuilderState.h"
namespace WebCore {
namespace Style {
template<typename ValueType>
const ValueType* requiredDowncast(BuilderState&, const CSSValue&);
template<typename ValueType>
std::optional<std::pair<Ref<const ValueType>, Ref<const ValueType>>> requiredPairDowncast(BuilderState&, const CSSValue&);
template<typename ValueType> struct TypedRequiredListIterator {
using iterator_category = std::forward_iterator_tag;
using value_type = const ValueType&;
using difference_type = ptrdiff_t;
using pointer = const ValueType*;
using reference = const ValueType&;
TypedRequiredListIterator(CSSValueList::iterator iterator)
: iterator(iterator)
{
}
TypedRequiredListIterator& operator++() { ++iterator; return *this; }
const ValueType& operator*() const { return downcast<ValueType>(*iterator); }
bool operator!=(const TypedRequiredListIterator& other) const { return iterator != other.iterator; }
CSSValueList::iterator iterator;
};
template<typename ListType, typename ValueType> struct TypedRequiredList {
TypedRequiredList(const ListType& list)
: list(list)
{
}
unsigned size() const { return list->size(); }
const ValueType& item(unsigned index) const { return downcast<ValueType>(*list->item(index)); }
TypedRequiredListIterator<ValueType> begin() const { return list->begin(); }
TypedRequiredListIterator<ValueType> end() const { return list->end(); }
Ref<const ListType> list;
};
template<typename ListType, typename ValueType, unsigned minimumLength = 1>
std::optional<TypedRequiredList<ListType, ValueType>> requiredListDowncast(BuilderState&, const CSSValue&);
template<CSSValueID, typename ValueType, unsigned minimumLength = 1>
std::optional<TypedRequiredList<CSSFunctionValue, ValueType>> requiredFunctionDowncast(BuilderState&, const CSSValue&);
template<typename ValueType>
inline const ValueType* requiredDowncast(BuilderState& builderState, const CSSValue& value)
{
auto* typedValue = dynamicDowncast<ValueType>(value);
if (!typedValue) [[unlikely]] {
builderState.setCurrentPropertyInvalidAtComputedValueTime();
return nullptr;
}
return typedValue;
}
template<typename ValueType>
inline std::optional<std::pair<Ref<const ValueType>, Ref<const ValueType>>> requiredPairDowncast(BuilderState& builderState, const CSSValue& value)
{
RefPtr pairValue = requiredDowncast<CSSValuePair>(builderState, value);
if (!pairValue) [[unlikely]]
return { };
RefPtr firstValue = requiredDowncast<ValueType>(builderState, pairValue->first());
if (!firstValue) [[unlikely]]
return { };
RefPtr secondValue = requiredDowncast<ValueType>(builderState, pairValue->second());
if (!secondValue) [[unlikely]]
return { };
return { { firstValue.releaseNonNull(), secondValue.releaseNonNull() } };
}
template<typename ListType, typename ValueType, unsigned minimumSize>
inline auto requiredListDowncast(BuilderState& builderState, const CSSValue& value) -> std::optional<TypedRequiredList<ListType, ValueType>>
{
RefPtr listValue = requiredDowncast<ListType>(builderState, value);
if (!listValue) [[unlikely]]
return { };
if (listValue->size() < minimumSize) [[unlikely]] {
builderState.setCurrentPropertyInvalidAtComputedValueTime();
return { };
}
for (Ref value : *listValue) {
if (!requiredDowncast<ValueType>(builderState, value)) [[unlikely]]
return { };
}
return TypedRequiredList<ListType, ValueType> { *listValue };
}
template<CSSValueID functionName, typename ValueType, unsigned minimumSize>
inline auto requiredFunctionDowncast(BuilderState& builderState, const CSSValue& value) -> std::optional<TypedRequiredList<CSSFunctionValue, ValueType>>
{
auto function = requiredListDowncast<CSSFunctionValue, ValueType, minimumSize>(builderState, value);
if (!function) [[unlikely]]
return { };
if (function->list->name() != functionName) {
builderState.setCurrentPropertyInvalidAtComputedValueTime();
return { };
}
return function;
}
} // namespace Style
} // namespace WebCore
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