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/*
* Copyright (C) 2024 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.
*/
#include "config.h"
#include "CalculationTree+Evaluation.h"
#include "CalculationExecutor.h"
#include "CalculationTree.h"
#include <wtf/StdLibExtras.h>
namespace WebCore {
namespace Calculation {
static auto evaluate(const None&, double percentResolutionLength) -> None;
static auto evaluate(const ChildOrNone&, double percentResolutionLength) -> std::variant<double, None>;
static auto evaluate(const std::optional<Child>&, double percentResolutionLength) -> std::optional<double>;
static auto evaluate(const Child&, double percentResolutionLength) -> double;
static auto evaluate(const Number&, double percentResolutionLength) -> double;
static auto evaluate(const Percentage&, double percentResolutionLength) -> double;
static auto evaluate(const Dimension&, double percentResolutionLength) -> double;
static auto evaluate(const IndirectNode<Sum>&, double percentResolutionLength) -> double;
static auto evaluate(const IndirectNode<Product>&, double percentResolutionLength) -> double;
static auto evaluate(const IndirectNode<Min>&, double percentResolutionLength) -> double;
static auto evaluate(const IndirectNode<Max>&, double percentResolutionLength) -> double;
static auto evaluate(const IndirectNode<Hypot>&, double percentResolutionLength) -> double;
static auto evaluate(const IndirectNode<Random>&, double percentResolutionLength) -> double;
static auto evaluate(const IndirectNode<Blend>&, double percentResolutionLength) -> double;
template<typename Op>
static auto evaluate(const IndirectNode<Op>&, double percentResolutionLength) -> double;
// MARK: Evaluation.
None evaluate(const None& root, double)
{
return root;
}
std::variant<double, None> evaluate(const ChildOrNone& root, double percentResolutionLength)
{
return WTF::switchOn(root, [&](const auto& root) { return std::variant<double, None> { evaluate(root, percentResolutionLength) }; });
}
double evaluate(const Child& root, double percentResolutionLength)
{
return WTF::switchOn(root, [&](const auto& root) { return evaluate(root, percentResolutionLength); });
}
std::optional<double> evaluate(const std::optional<Child>& root, double percentResolutionLength)
{
if (root)
return static_cast<double>(evaluate(*root, percentResolutionLength));
return std::nullopt;
}
double evaluate(const Number& number, double)
{
return number.value;
}
double evaluate(const Percentage& percentage, double percentResolutionLength)
{
return percentResolutionLength * percentage.value / 100.0;
}
double evaluate(const Dimension& root, double)
{
return root.value;
}
double evaluate(const IndirectNode<Sum>& root, double percentResolutionLength)
{
return executeOperation<Sum>(root->children.value, [&](const auto& child) -> double {
return evaluate(child, percentResolutionLength);
});
}
double evaluate(const IndirectNode<Product>& root, double percentResolutionLength)
{
return executeOperation<Product>(root->children.value, [&](const auto& child) -> double {
return evaluate(child, percentResolutionLength);
});
}
double evaluate(const IndirectNode<Min>& root, double percentResolutionLength)
{
return executeOperation<Min>(root->children.value, [&](const auto& child) -> double {
return evaluate(child, percentResolutionLength);
});
}
double evaluate(const IndirectNode<Max>& root, double percentResolutionLength)
{
return executeOperation<Max>(root->children.value, [&](const auto& child) -> double {
return evaluate(child, percentResolutionLength);
});
}
double evaluate(const IndirectNode<Hypot>& root, double percentResolutionLength)
{
return executeOperation<Hypot>(root->children.value, [&](const auto& child) -> double {
return evaluate(child, percentResolutionLength);
});
}
double evaluate(const IndirectNode<Random>& root, double percentResolutionLength)
{
auto min = evaluate(root->min, percentResolutionLength);
auto max = evaluate(root->max, percentResolutionLength);
auto step = evaluate(root->step, percentResolutionLength);
// RandomKeyMap relies on using NaN for HashTable deleted/empty values but
// the result is always NaN if either is NaN, so we can return early here.
if (std::isnan(min) || std::isnan(max))
return std::numeric_limits<double>::quiet_NaN();
Ref keyMap = root->cachingOptions.keyMap;
auto randomUnitInterval = keyMap->lookupUnitInterval(
root->cachingOptions.identifier,
min,
max,
step
);
return executeOperation<Random>(randomUnitInterval, min, max, step);
}
double evaluate(const IndirectNode<Blend>& root, double percentResolutionLength)
{
return (1.0 - root->progress) * evaluate(root->from, percentResolutionLength) + root->progress * evaluate(root->to, percentResolutionLength);
}
template<typename Op> double evaluate(const IndirectNode<Op>& root, double percentResolutionLength)
{
return WTF::apply([&](const auto& ...x) { return executeOperation<Op>(evaluate(x, percentResolutionLength)...); } , *root);
}
double evaluate(const Tree& tree, double percentResolutionLength)
{
return evaluate(tree.root, percentResolutionLength);
}
} // namespace Calculation
} // namespace WebCore
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