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/*
* (C) 1999-2003 Lars Knoll (knoll@kde.org)
* Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#pragma once
#include "CSSPropertyNames.h"
#include "CSSUnits.h"
#include "CSSValue.h"
#include "CSSValueKeywords.h"
#include "Color.h"
#include "ExceptionOr.h"
#include "LayoutUnit.h"
#include <utility>
#include <wtf/Forward.h>
#include <wtf/MathExtras.h>
namespace WebCore {
class CSSBasicShape;
class CSSCalcValue;
class CSSToLengthConversionData;
class Counter;
class DeprecatedCSSOMPrimitiveValue;
class Pair;
class Quad;
class RGBColor;
class Rect;
class RenderStyle;
struct CSSFontFamily;
struct Length;
struct LengthSize;
// Max/min values for CSS, needs to slightly smaller/larger than the true max/min values to allow for rounding without overflowing.
// Subtract two (rather than one) to allow for values to be converted to float and back without exceeding the LayoutUnit::max.
const int maxValueForCssLength = intMaxForLayoutUnit - 2;
const int minValueForCssLength = intMinForLayoutUnit + 2;
// Dimension calculations are imprecise, often resulting in values of e.g.
// 44.99998. We need to round if we're really close to the next integer value.
template<typename T> inline T roundForImpreciseConversion(double value)
{
value += (value < 0) ? -0.01 : +0.01;
return ((value > std::numeric_limits<T>::max()) || (value < std::numeric_limits<T>::min())) ? 0 : static_cast<T>(value);
}
template<> inline float roundForImpreciseConversion(double value)
{
double ceiledValue = ceil(value);
double proximityToNextInt = ceiledValue - value;
if (proximityToNextInt <= 0.01 && value > 0)
return static_cast<float>(ceiledValue);
if (proximityToNextInt >= 0.99 && value < 0)
return static_cast<float>(floor(value));
return static_cast<float>(value);
}
class CSSPrimitiveValue final : public CSSValue {
public:
static bool isFontRelativeLength(CSSUnitType);
static bool isLength(CSSUnitType);
static bool isResolution(CSSUnitType);
static bool isViewportPercentageLength(CSSUnitType type) { return type >= CSSUnitType::CSS_VW && type <= CSSUnitType::CSS_VMAX; }
// FIXME: Some of these use primitiveUnitType() and some use primitiveType(). Those that use primitiveUnitType() are broken with calc().
bool isAngle() const { return unitCategory(primitiveType()) == CSSUnitCategory::Angle; }
bool isAttr() const { return primitiveUnitType() == CSSUnitType::CSS_ATTR; }
bool isCounter() const { return primitiveUnitType() == CSSUnitType::CSS_COUNTER; }
bool isFontIndependentLength() const { return primitiveUnitType() >= CSSUnitType::CSS_PX && primitiveUnitType() <= CSSUnitType::CSS_PC; }
bool isFontRelativeLength() const { return isFontRelativeLength(primitiveUnitType()); }
bool isQuirkyEms() const { return primitiveType() == CSSUnitType::CSS_QUIRKY_EMS; }
bool isLength() const { return isLength(static_cast<CSSUnitType>(primitiveType())); }
bool isNumber() const { return primitiveType() == CSSUnitType::CSS_NUMBER; }
bool isPercentage() const { return primitiveType() == CSSUnitType::CSS_PERCENTAGE; }
bool isPx() const { return primitiveType() == CSSUnitType::CSS_PX; }
bool isRect() const { return primitiveUnitType() == CSSUnitType::CSS_RECT; }
bool isPair() const { return primitiveUnitType() == CSSUnitType::CSS_PAIR; }
bool isPropertyID() const { return primitiveUnitType() == CSSUnitType::CSS_PROPERTY_ID; }
bool isRGBColor() const { return primitiveUnitType() == CSSUnitType::CSS_RGBCOLOR; }
bool isShape() const { return primitiveUnitType() == CSSUnitType::CSS_SHAPE; }
bool isString() const { return primitiveUnitType() == CSSUnitType::CSS_STRING; }
bool isFontFamily() const { return primitiveUnitType() == CSSUnitType::CSS_FONT_FAMILY; }
bool isTime() const { return unitCategory(primitiveUnitType()) == CSSUnitCategory::Time; }
bool isFrequency() const { return unitCategory(primitiveType()) == CSSUnitCategory::Frequency; }
bool isURI() const { return primitiveUnitType() == CSSUnitType::CSS_URI; }
bool isCalculated() const { return primitiveUnitType() == CSSUnitType::CSS_CALC; }
bool isCalculatedPercentageWithNumber() const { return primitiveType() == CSSUnitType::CSS_CALC_PERCENTAGE_WITH_NUMBER; }
bool isCalculatedPercentageWithLength() const { return primitiveType() == CSSUnitType::CSS_CALC_PERCENTAGE_WITH_LENGTH; }
bool isDotsPerInch() const { return primitiveType() == CSSUnitType::CSS_DPI; }
bool isDotsPerPixel() const { return primitiveType() == CSSUnitType::CSS_DPPX; }
bool isDotsPerCentimeter() const { return primitiveType() == CSSUnitType::CSS_DPCM; }
bool isResolution() const { return unitCategory(primitiveType()) == CSSUnitCategory::Resolution; }
bool isViewportPercentageLength() const { return isViewportPercentageLength(primitiveUnitType()); }
bool isViewportPercentageWidth() const { return primitiveUnitType() == CSSUnitType::CSS_VW; }
bool isViewportPercentageHeight() const { return primitiveUnitType() == CSSUnitType::CSS_VH; }
bool isViewportPercentageMax() const { return primitiveUnitType() == CSSUnitType::CSS_VMAX; }
bool isViewportPercentageMin() const { return primitiveUnitType() == CSSUnitType::CSS_VMIN; }
bool isValueID() const { return primitiveUnitType() == CSSUnitType::CSS_VALUE_ID; }
bool isFlex() const { return primitiveType() == CSSUnitType::CSS_FR; }
static Ref<CSSPrimitiveValue> createIdentifier(CSSValueID valueID) { return adoptRef(*new CSSPrimitiveValue(valueID)); }
static Ref<CSSPrimitiveValue> createIdentifier(CSSPropertyID propertyID) { return adoptRef(*new CSSPrimitiveValue(propertyID)); }
static Ref<CSSPrimitiveValue> create(double value, CSSUnitType type) { return adoptRef(*new CSSPrimitiveValue(value, type)); }
static Ref<CSSPrimitiveValue> create(const String& value, CSSUnitType type) { return adoptRef(*new CSSPrimitiveValue(value, type)); }
static Ref<CSSPrimitiveValue> create(const Length& value, const RenderStyle& style) { return adoptRef(*new CSSPrimitiveValue(value, style)); }
static Ref<CSSPrimitiveValue> create(const LengthSize& value, const RenderStyle& style) { return adoptRef(*new CSSPrimitiveValue(value, style)); }
template<typename T> static Ref<CSSPrimitiveValue> create(T&&);
~CSSPrimitiveValue();
void cleanup();
WEBCORE_EXPORT CSSUnitType primitiveType() const;
WEBCORE_EXPORT ExceptionOr<void> setFloatValue(CSSUnitType , double);
WEBCORE_EXPORT ExceptionOr<float> getFloatValue(CSSUnitType) const;
WEBCORE_EXPORT ExceptionOr<void> setStringValue(CSSUnitType, const String&);
WEBCORE_EXPORT ExceptionOr<String> getStringValue() const;
double computeDegrees() const;
enum TimeUnit { Seconds, Milliseconds };
template<typename T, TimeUnit timeUnit> T computeTime() const;
template<typename T> T computeLength(const CSSToLengthConversionData&) const;
template<int> Length convertToLength(const CSSToLengthConversionData&) const;
bool convertingToLengthRequiresNonNullStyle(int lengthConversion) const;
double doubleValue(CSSUnitType) const;
// It's usually wrong to call this; it can trigger type conversion in calc without sufficient context to resolve relative length units.
double doubleValue() const;
// These return nullopt for calc, for which range checking is not done at parse time: <https://www.w3.org/TR/css3-values/#calc-range>.
Optional<bool> isZero() const;
Optional<bool> isPositive() const;
Optional<bool> isNegative() const;
template<typename T> inline T value(CSSUnitType type) const { return clampTo<T>(doubleValue(type)); }
template<typename T> inline T value() const { return clampTo<T>(doubleValue()); }
float floatValue(CSSUnitType type) const { return value<float>(type); }
float floatValue() const { return value<float>(); }
int intValue(CSSUnitType type) const { return value<int>(type); }
int intValue() const { return value<int>(); }
WEBCORE_EXPORT String stringValue() const;
const Color& color() const { ASSERT(primitiveUnitType() == CSSUnitType::CSS_RGBCOLOR); return *m_value.color; }
Counter* counterValue() const { return primitiveUnitType() != CSSUnitType::CSS_COUNTER ? nullptr : m_value.counter; }
CSSCalcValue* cssCalcValue() const { return primitiveUnitType() != CSSUnitType::CSS_CALC ? nullptr : m_value.calc; }
const CSSFontFamily& fontFamily() const { ASSERT(primitiveUnitType() == CSSUnitType::CSS_FONT_FAMILY); return *m_value.fontFamily; }
Pair* pairValue() const { return primitiveUnitType() != CSSUnitType::CSS_PAIR ? nullptr : m_value.pair; }
CSSPropertyID propertyID() const { return primitiveUnitType() == CSSUnitType::CSS_PROPERTY_ID ? m_value.propertyID : CSSPropertyInvalid; }
Quad* quadValue() const { return primitiveUnitType() != CSSUnitType::CSS_QUAD ? nullptr : m_value.quad; }
Rect* rectValue() const { return primitiveUnitType() != CSSUnitType::CSS_RECT ? nullptr : m_value.rect; }
CSSBasicShape* shapeValue() const { return primitiveUnitType() != CSSUnitType::CSS_SHAPE ? nullptr : m_value.shape; }
CSSValueID valueID() const { return primitiveUnitType() == CSSUnitType::CSS_VALUE_ID ? m_value.valueID : CSSValueInvalid; }
template<typename T> inline operator T() const; // Defined in CSSPrimitiveValueMappings.h
String customCSSText() const;
bool equals(const CSSPrimitiveValue&) const;
static double conversionToCanonicalUnitsScaleFactor(CSSUnitType);
static String unitTypeString(CSSUnitType);
static double computeNonCalcLengthDouble(const CSSToLengthConversionData&, CSSUnitType, double value);
// True if computeNonCalcLengthDouble would produce identical results when resolved against both these styles.
static bool equalForLengthResolution(const RenderStyle&, const RenderStyle&);
Ref<DeprecatedCSSOMPrimitiveValue> createDeprecatedCSSOMPrimitiveWrapper(CSSStyleDeclaration&) const;
void collectDirectComputationalDependencies(HashSet<CSSPropertyID>&) const;
void collectDirectRootComputationalDependencies(HashSet<CSSPropertyID>&) const;
private:
friend class CSSValuePool;
friend LazyNeverDestroyed<CSSPrimitiveValue>;
CSSPrimitiveValue(CSSValueID);
CSSPrimitiveValue(CSSPropertyID);
CSSPrimitiveValue(const Color&);
CSSPrimitiveValue(const Length&);
CSSPrimitiveValue(const Length&, const RenderStyle&);
CSSPrimitiveValue(const LengthSize&, const RenderStyle&);
CSSPrimitiveValue(const String&, CSSUnitType);
CSSPrimitiveValue(double, CSSUnitType);
CSSPrimitiveValue(StaticCSSValueTag, CSSValueID);
CSSPrimitiveValue(StaticCSSValueTag, const Color&);
CSSPrimitiveValue(StaticCSSValueTag, double, CSSUnitType);
template<typename T> CSSPrimitiveValue(T); // Defined in CSSPrimitiveValueMappings.h
template<typename T> CSSPrimitiveValue(RefPtr<T>&&);
template<typename T> CSSPrimitiveValue(Ref<T>&&);
static void create(int); // compile-time guard
static void create(unsigned); // compile-time guard
template<typename T> operator T*(); // compile-time guard
void init(const Length&);
void init(const LengthSize&, const RenderStyle&);
void init(Ref<CSSBasicShape>&&);
void init(RefPtr<CSSCalcValue>&&);
void init(Ref<Counter>&&);
void init(Ref<Pair>&&);
void init(Ref<Quad>&&);
void init(Ref<Rect>&&);
CSSUnitType primitiveUnitType() const { return static_cast<CSSUnitType>(m_primitiveUnitType); }
void setPrimitiveUnitType(CSSUnitType type) { m_primitiveUnitType = static_cast<unsigned>(type); }
Optional<double> doubleValueInternal(CSSUnitType targetUnitType) const;
double computeLengthDouble(const CSSToLengthConversionData&) const;
ALWAYS_INLINE String formatNumberForCustomCSSText() const;
NEVER_INLINE String formatNumberValue(StringView) const;
union {
CSSPropertyID propertyID;
CSSValueID valueID;
double num;
StringImpl* string;
Counter* counter;
Rect* rect;
Quad* quad;
const Color* color;
Pair* pair;
CSSBasicShape* shape;
CSSCalcValue* calc;
const CSSFontFamily* fontFamily;
} m_value;
};
inline bool CSSPrimitiveValue::isFontRelativeLength(CSSUnitType type)
{
return type == CSSUnitType::CSS_EMS
|| type == CSSUnitType::CSS_EXS
|| type == CSSUnitType::CSS_LHS
|| type == CSSUnitType::CSS_RLHS
|| type == CSSUnitType::CSS_REMS
|| type == CSSUnitType::CSS_CHS
|| type == CSSUnitType::CSS_QUIRKY_EMS;
}
inline bool CSSPrimitiveValue::isLength(CSSUnitType type)
{
return (type >= CSSUnitType::CSS_EMS && type <= CSSUnitType::CSS_PC)
|| type == CSSUnitType::CSS_REMS
|| type == CSSUnitType::CSS_CHS
|| type == CSSUnitType::CSS_Q
|| type == CSSUnitType::CSS_LHS
|| type == CSSUnitType::CSS_RLHS
|| isViewportPercentageLength(type)
|| type == CSSUnitType::CSS_QUIRKY_EMS;
}
inline bool CSSPrimitiveValue::isResolution(CSSUnitType type)
{
return type >= CSSUnitType::CSS_DPPX && type <= CSSUnitType::CSS_DPCM;
}
template<typename T> inline Ref<CSSPrimitiveValue> CSSPrimitiveValue::create(T&& value)
{
return adoptRef(*new CSSPrimitiveValue(std::forward<T>(value)));
}
template<typename T, CSSPrimitiveValue::TimeUnit timeUnit> inline T CSSPrimitiveValue::computeTime() const
{
if (timeUnit == Seconds && primitiveType() == CSSUnitType::CSS_S)
return value<T>();
if (timeUnit == Seconds && primitiveType() == CSSUnitType::CSS_MS)
return value<T>() / 1000;
if (timeUnit == Milliseconds && primitiveType() == CSSUnitType::CSS_MS)
return value<T>();
if (timeUnit == Milliseconds && primitiveType() == CSSUnitType::CSS_S)
return value<T>() * 1000;
ASSERT_NOT_REACHED();
return 0;
}
template<typename T> inline CSSPrimitiveValue::CSSPrimitiveValue(RefPtr<T>&& value)
: CSSValue(PrimitiveClass)
{
init(WTFMove(value));
}
template<typename T> inline CSSPrimitiveValue::CSSPrimitiveValue(Ref<T>&& value)
: CSSValue(PrimitiveClass)
{
init(WTFMove(value));
}
} // namespace WebCore
SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSPrimitiveValue, isPrimitiveValue())