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/*
* Copyright (C) 2024-2025 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. ``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,
* 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 "CSSCalcTree.h"
#include <wtf/StdLibExtras.h>
namespace WebCore {
namespace CSSCalc {
// MARK: Traversal
// MARK: - forAllChildren
// `forAllChildren` will call the provided `functor` on all direct children of the provided node. This will include values of type `Child`, `ChildOrNone` and `std::optional<Child>`.
template<typename F, Leaf Op> void forAllChildren(const auto&, const F&)
{
// No children.
}
template<typename F, typename Op> void forAllChildren(const Op& root, const F& functor)
{
struct Caller {
const F& functor;
void operator()(const Children& children)
{
for (auto& child : children)
functor(child);
}
void operator()(const std::optional<Child>& root)
{
functor(root);
}
void operator()(const ChildOrNone& root)
{
functor(root);
}
void operator()(const Child& root)
{
functor(root);
}
void operator()(const AtomString& root)
{
functor(root);
}
void operator()(const MQ::MediaProgressProviding* root)
{
functor(root);
}
void operator()(const CQ::ContainerProgressProviding* root)
{
functor(root);
}
};
auto caller = Caller { functor };
WTF::apply([&](const auto& ...x) { (..., caller(x)); }, root);
}
template<typename F> void forAllChildren(const Child& root, const F& functor)
{
WTF::switchOn(root, [&](const auto& root) { forAllChildren(*root, functor); });
}
// MARK: - forAllChildNodes
// `forAllChildNodes` will call the provided `functor` on all direct `Child` typed children of the provided node. If a child is of type `ChildOrNone` or `std::optional<Child>`, the functor will be called on the unwrapped `Child` if and only if that is what the type is holding.
template<typename F, Leaf Op> void forAllChildNodes(const Op&, const F&)
{
// No children.
}
template<typename F, typename Op> void forAllChildNodes(const Op& root, const F& functor)
{
struct Caller {
const F& functor;
void operator()(const Children& children)
{
for (auto& child : children)
functor(child);
}
void operator()(const std::optional<Child>& root)
{
if (root)
functor(*root);
}
void operator()(const ChildOrNone& root)
{
WTF::switchOn(root,
[&](const Child& root) { functor(root); },
[&](const CSS::Keyword::None&) { }
);
}
void operator()(const Child& root)
{
functor(root);
}
void operator()(const AtomString&)
{
}
void operator()(const MQ::MediaProgressProviding*)
{
}
void operator()(const CQ::ContainerProgressProviding*)
{
}
void operator()(const Random::CachingOptions&)
{
}
};
auto caller = Caller { functor };
WTF::apply([&](const auto& ...x) { (..., caller(x)); }, root);
}
template<typename F> void forAllChildNodes(const Child& root, const F& functor)
{
WTF::switchOn(root, [&](const auto& root) { forAllChildNodes(*root, functor); });
}
} // namespace CSSCalc
} // namespace WebCore
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