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/*
* Copyright (C) 2022 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,
* 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 "GenericMediaQueryEvaluator.h"
#include "CSSAspectRatioValue.h"
#include "CSSPrimitiveValue.h"
#include "CSSToLengthConversionData.h"
namespace WebCore {
namespace MQ {
static std::optional<LayoutUnit> computeLength(const CSSValue* value, const CSSToLengthConversionData& conversionData)
{
if (!is<CSSPrimitiveValue>(value))
return { };
auto& primitiveValue = downcast<CSSPrimitiveValue>(*value);
if (primitiveValue.isNumberOrInteger()) {
if (primitiveValue.doubleValue())
return { };
return 0_lu;
}
if (!primitiveValue.isLength())
return { };
return primitiveValue.computeLength<LayoutUnit>(conversionData);
}
template<typename T>
bool compare(ComparisonOperator op, T left, T right)
{
switch (op) {
case ComparisonOperator::LessThan:
return left < right;
case ComparisonOperator::GreaterThan:
return left > right;
case ComparisonOperator::LessThanOrEqual:
return left <= right;
case ComparisonOperator::GreaterThanOrEqual:
return left >= right;
case ComparisonOperator::Equal:
return left == right;
}
RELEASE_ASSERT_NOT_REACHED();
};
enum class Side : uint8_t { Left, Right };
static EvaluationResult evaluateLengthComparison(LayoutUnit size, const std::optional<Comparison>& comparison, Side side, const CSSToLengthConversionData& conversionData)
{
if (!comparison)
return EvaluationResult::True;
auto expressionSize = computeLength(comparison->value.get(), conversionData);
if (!expressionSize)
return EvaluationResult::Unknown;
auto left = side == Side::Left ? *expressionSize : size;
auto right = side == Side::Left ? size : *expressionSize;
return toEvaluationResult(compare(comparison->op, left, right));
};
static EvaluationResult evaluateNumberComparison(double number, const std::optional<Comparison>& comparison, Side side)
{
if (!comparison)
return EvaluationResult::True;
auto expressionNumber = dynamicDowncast<CSSPrimitiveValue>(comparison->value.get())->doubleValue();
auto left = side == Side::Left ? expressionNumber : number;
auto right = side == Side::Left ? number : expressionNumber;
return toEvaluationResult(compare(comparison->op, left, right));
};
static EvaluationResult evaluateIntegerComparison(int number, const std::optional<Comparison>& comparison, Side side)
{
if (!comparison)
return EvaluationResult::True;
auto expressionNumber = dynamicDowncast<CSSPrimitiveValue>(comparison->value.get())->intValue();
auto left = side == Side::Left ? expressionNumber : number;
auto right = side == Side::Left ? number : expressionNumber;
return toEvaluationResult(compare(comparison->op, left, right));
};
static EvaluationResult evaluateResolutionComparison(float resolution, const std::optional<Comparison>& comparison, Side side)
{
if (!comparison)
return EvaluationResult::True;
auto expressionResolution = dynamicDowncast<CSSPrimitiveValue>(comparison->value.get())->floatValue(CSSUnitType::CSS_DPPX);
auto left = side == Side::Left ? expressionResolution : resolution;
auto right = side == Side::Left ? resolution : expressionResolution;
return toEvaluationResult(compare(comparison->op, left, right));
};
EvaluationResult evaluateLengthFeature(const Feature& feature, LayoutUnit length, const CSSToLengthConversionData& conversionData)
{
if (!feature.leftComparison && !feature.rightComparison)
return toEvaluationResult(!!length);
auto leftResult = evaluateLengthComparison(length, feature.leftComparison, Side::Left, conversionData);
auto rightResult = evaluateLengthComparison(length, feature.rightComparison, Side::Right, conversionData);
return leftResult & rightResult;
};
static EvaluationResult evaluateRatioComparison(FloatSize size, const std::optional<Comparison>& comparison, Side side)
{
if (!comparison)
return EvaluationResult::True;
if (!is<CSSAspectRatioValue>(comparison->value))
return EvaluationResult::Unknown;
auto& ratioValue = downcast<CSSAspectRatioValue>(*comparison->value);
// Ratio with zero denominator is infinite and compares greater to any value.
auto denominator = ratioValue.denominatorValue();
auto comparisonA = denominator ? size.height() * ratioValue.numeratorValue() : 1.f;
auto comparisonB = denominator ? size.width() * denominator : 0.f;
auto left = side == Side::Left ? comparisonA : comparisonB;
auto right = side == Side::Left ? comparisonB : comparisonA;
return toEvaluationResult(compare(comparison->op, left, right));
};
EvaluationResult evaluateRatioFeature(const Feature& feature, FloatSize size)
{
if (!feature.leftComparison && !feature.rightComparison)
return toEvaluationResult(size.width());
auto leftResult = evaluateRatioComparison(size, feature.leftComparison, Side::Left);
auto rightResult = evaluateRatioComparison(size, feature.rightComparison, Side::Right);
return leftResult & rightResult;
}
EvaluationResult evaluateBooleanFeature(const Feature& feature, bool currentValue)
{
if (!feature.rightComparison)
return toEvaluationResult(currentValue);
auto& value = downcast<CSSPrimitiveValue>(*feature.rightComparison->value);
auto expectedValue = value.intValue();
if (expectedValue && expectedValue != 1)
return EvaluationResult::Unknown;
return toEvaluationResult(expectedValue == currentValue);
}
EvaluationResult evaluateIntegerFeature(const Feature& feature, int currentValue)
{
if (!feature.leftComparison && !feature.rightComparison)
return toEvaluationResult(!!currentValue);
auto leftResult = evaluateIntegerComparison(currentValue, feature.leftComparison, Side::Left);
auto rightResult = evaluateIntegerComparison(currentValue, feature.rightComparison, Side::Right);
return leftResult & rightResult;
}
EvaluationResult evaluateNumberFeature(const Feature& feature, double currentValue)
{
if (!feature.leftComparison && !feature.rightComparison)
return toEvaluationResult(!!currentValue);
auto leftResult = evaluateNumberComparison(currentValue, feature.leftComparison, Side::Left);
auto rightResult = evaluateNumberComparison(currentValue, feature.rightComparison, Side::Right);
return leftResult & rightResult;
}
EvaluationResult evaluateResolutionFeature(const Feature& feature, float currentValue)
{
if (!feature.leftComparison && !feature.rightComparison)
return toEvaluationResult(!!currentValue);
auto leftResult = evaluateResolutionComparison(currentValue, feature.leftComparison, Side::Left);
auto rightResult = evaluateResolutionComparison(currentValue, feature.rightComparison, Side::Right);
return leftResult & rightResult;
}
EvaluationResult evaluateIdentifierFeature(const Feature& feature, CSSValueID currentValue)
{
if (!feature.rightComparison)
return toEvaluationResult(currentValue != CSSValueNone && currentValue != CSSValueNoPreference);
auto& value = downcast<CSSPrimitiveValue>(*feature.rightComparison->value);
return toEvaluationResult(value.valueID() == currentValue);
}
}
}
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