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// Copyright 2016 The Chromium Authors. All rights reserved.
// Copyright (C) 2016 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:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
// OWNER OR 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.
#include "config.h"
#include "CSSPropertyParserHelpers.h"
#include "CSSCalculationValue.h"
#include "CSSCanvasValue.h"
#include "CSSCrossfadeValue.h"
#include "CSSFilterImageValue.h"
#include "CSSGradientValue.h"
#include "CSSImageSetValue.h"
#include "CSSImageValue.h"
#include "CSSNamedImageValue.h"
#include "CSSPaintImageValue.h"
#include "CSSParserIdioms.h"
#include "CSSValuePool.h"
#include "Pair.h"
#include "RuntimeEnabledFeatures.h"
#include "StyleColor.h"
#include <wtf/text/StringConcatenateNumbers.h>
namespace WebCore {
namespace CSSPropertyParserHelpers {
bool consumeCommaIncludingWhitespace(CSSParserTokenRange& range)
{
CSSParserToken value = range.peek();
if (value.type() != CommaToken)
return false;
range.consumeIncludingWhitespace();
return true;
}
bool consumeSlashIncludingWhitespace(CSSParserTokenRange& range)
{
CSSParserToken value = range.peek();
if (value.type() != DelimiterToken || value.delimiter() != '/')
return false;
range.consumeIncludingWhitespace();
return true;
}
CSSParserTokenRange consumeFunction(CSSParserTokenRange& range)
{
ASSERT(range.peek().type() == FunctionToken);
CSSParserTokenRange contents = range.consumeBlock();
range.consumeWhitespace();
contents.consumeWhitespace();
return contents;
}
// FIXME: consider pulling in the parsing logic from CSSCalculationValue.cpp.
class CalcParser {
public:
explicit CalcParser(CSSParserTokenRange& range, CalculationCategory destinationCategory, ValueRange valueRange = ValueRangeAll)
: m_sourceRange(range)
, m_range(range)
{
const CSSParserToken& token = range.peek();
auto functionId = token.functionId();
if (CSSCalcValue::isCalcFunction(functionId))
m_calcValue = CSSCalcValue::create(functionId, consumeFunction(m_range), destinationCategory, valueRange);
}
const CSSCalcValue* value() const { return m_calcValue.get(); }
RefPtr<CSSPrimitiveValue> consumeValue()
{
if (!m_calcValue)
return nullptr;
m_sourceRange = m_range;
return CSSValuePool::singleton().createValue(WTFMove(m_calcValue));
}
RefPtr<CSSPrimitiveValue> consumeInteger(double minimumValue)
{
if (!m_calcValue)
return nullptr;
m_sourceRange = m_range;
double value = std::max(m_calcValue->doubleValue(), minimumValue);
value = std::round(value);
return CSSValuePool::singleton().createValue(value, CSSUnitType::CSS_NUMBER);
}
RefPtr<CSSPrimitiveValue> consumeNumber()
{
if (!m_calcValue)
return nullptr;
m_sourceRange = m_range;
return CSSValuePool::singleton().createValue(m_calcValue->doubleValue(), CSSUnitType::CSS_NUMBER);
}
bool consumeNumberRaw(double& result)
{
if (!m_calcValue || m_calcValue->category() != CalculationCategory::Number)
return false;
m_sourceRange = m_range;
result = m_calcValue->doubleValue();
return true;
}
private:
CSSParserTokenRange& m_sourceRange;
CSSParserTokenRange m_range;
RefPtr<CSSCalcValue> m_calcValue;
};
RefPtr<CSSPrimitiveValue> consumeInteger(CSSParserTokenRange& range, double minimumValue)
{
const CSSParserToken& token = range.peek();
if (token.type() == NumberToken) {
if (token.numericValueType() == NumberValueType || token.numericValue() < minimumValue)
return nullptr;
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), CSSUnitType::CSS_NUMBER);
}
if (token.type() != FunctionToken)
return nullptr;
CalcParser calcParser(range, CalculationCategory::Number);
if (const CSSCalcValue* calculation = calcParser.value()) {
if (calculation->category() != CalculationCategory::Number)
return nullptr;
return calcParser.consumeInteger(minimumValue);
}
return nullptr;
}
RefPtr<CSSPrimitiveValue> consumePositiveInteger(CSSParserTokenRange& range)
{
return consumeInteger(range, 1);
}
bool consumeNumberRaw(CSSParserTokenRange& range, double& result)
{
const CSSParserToken& token = range.peek();
if (token.type() == NumberToken) {
result = range.consumeIncludingWhitespace().numericValue();
return true;
}
if (token.type() != FunctionToken)
return false;
CalcParser calcParser(range, CalculationCategory::Number, ValueRangeAll);
return calcParser.consumeNumberRaw(result);
}
// FIXME: Work out if this can just call consumeNumberRaw
RefPtr<CSSPrimitiveValue> consumeNumber(CSSParserTokenRange& range, ValueRange valueRange)
{
const CSSParserToken& token = range.peek();
if (token.type() == NumberToken) {
if (valueRange == ValueRangeNonNegative && token.numericValue() < 0)
return nullptr;
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), token.unitType());
}
if (token.type() != FunctionToken)
return nullptr;
CalcParser calcParser(range, CalculationCategory::Number, valueRange);
if (const CSSCalcValue* calcValue = calcParser.value()) {
if (calcValue->category() != CalculationCategory::Number)
return nullptr;
return calcParser.consumeValue();
}
return nullptr;
}
#if !ENABLE(VARIATION_FONTS)
static inline bool divisibleBy100(double value)
{
return static_cast<int>(value / 100) * 100 == value;
}
#endif
RefPtr<CSSPrimitiveValue> consumeFontWeightNumber(CSSParserTokenRange& range)
{
// Values less than or equal to 0 or greater than or equal to 1000 are parse errors.
auto& token = range.peek();
if (token.type() == NumberToken && token.numericValue() >= 1 && token.numericValue() <= 1000
#if !ENABLE(VARIATION_FONTS)
&& token.numericValueType() == IntegerValueType && divisibleBy100(token.numericValue())
#endif
)
return consumeNumber(range, ValueRangeAll);
if (token.type() != FunctionToken)
return nullptr;
// "[For calc()], the used value resulting from an expression must be clamped to the range allowed in the target context."
CalcParser calcParser(range, CalculationCategory::Number, ValueRangeAll);
double result;
if (calcParser.consumeNumberRaw(result)
#if !ENABLE(VARIATION_FONTS)
&& result > 0 && result < 1000 && divisibleBy100(result)
#endif
) {
result = std::min(std::max(result, std::nextafter(0., 1.)), std::nextafter(1000., 0.));
return CSSValuePool::singleton().createValue(result, CSSUnitType::CSS_NUMBER);
}
return nullptr;
}
inline bool shouldAcceptUnitlessValue(double value, CSSParserMode cssParserMode, UnitlessQuirk unitless)
{
// FIXME: Presentational HTML attributes shouldn't use the CSS parser for lengths
return value == 0
|| isUnitLessValueParsingEnabledForMode(cssParserMode)
|| (cssParserMode == HTMLQuirksMode && unitless == UnitlessQuirk::Allow);
}
RefPtr<CSSPrimitiveValue> consumeLength(CSSParserTokenRange& range, CSSParserMode cssParserMode, ValueRange valueRange, UnitlessQuirk unitless)
{
const CSSParserToken& token = range.peek();
if (token.type() == DimensionToken) {
switch (token.unitType()) {
case CSSUnitType::CSS_QUIRKY_EMS:
if (cssParserMode != UASheetMode)
return nullptr;
FALLTHROUGH;
case CSSUnitType::CSS_EMS:
case CSSUnitType::CSS_REMS:
case CSSUnitType::CSS_CHS:
case CSSUnitType::CSS_EXS:
case CSSUnitType::CSS_PX:
case CSSUnitType::CSS_CM:
case CSSUnitType::CSS_MM:
case CSSUnitType::CSS_IN:
case CSSUnitType::CSS_PT:
case CSSUnitType::CSS_PC:
case CSSUnitType::CSS_VW:
case CSSUnitType::CSS_VH:
case CSSUnitType::CSS_VMIN:
case CSSUnitType::CSS_VMAX:
case CSSUnitType::CSS_Q:
break;
default:
return nullptr;
}
if ((valueRange == ValueRangeNonNegative && token.numericValue() < 0) || std::isinf(token.numericValue()))
return nullptr;
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), token.unitType());
}
if (token.type() == NumberToken) {
if (!shouldAcceptUnitlessValue(token.numericValue(), cssParserMode, unitless)
|| (valueRange == ValueRangeNonNegative && token.numericValue() < 0))
return nullptr;
if (std::isinf(token.numericValue()))
return nullptr;
CSSUnitType unitType = CSSUnitType::CSS_PX;
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), unitType);
}
if (token.type() != FunctionToken)
return nullptr;
CalcParser calcParser(range, CalculationCategory::Length, valueRange);
if (calcParser.value() && calcParser.value()->category() == CalculationCategory::Length)
return calcParser.consumeValue();
return nullptr;
}
RefPtr<CSSPrimitiveValue> consumePercent(CSSParserTokenRange& range, ValueRange valueRange)
{
const CSSParserToken& token = range.peek();
if (token.type() == PercentageToken) {
if ((valueRange == ValueRangeNonNegative && token.numericValue() < 0) || std::isinf(token.numericValue()))
return nullptr;
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), CSSUnitType::CSS_PERCENTAGE);
}
if (token.type() != FunctionToken)
return nullptr;
CalcParser calcParser(range, CalculationCategory::Percent, valueRange);
if (const CSSCalcValue* calculation = calcParser.value()) {
if (calculation->category() == CalculationCategory::Percent)
return calcParser.consumeValue();
}
return nullptr;
}
static bool canConsumeCalcValue(CalculationCategory category, CSSParserMode cssParserMode)
{
if (category == CalculationCategory::Length || category == CalculationCategory::Percent || category == CalculationCategory::PercentLength)
return true;
if (cssParserMode != SVGAttributeMode)
return false;
if (category == CalculationCategory::Number || category == CalculationCategory::PercentNumber)
return true;
return false;
}
RefPtr<CSSPrimitiveValue> consumeLengthOrPercent(CSSParserTokenRange& range, CSSParserMode cssParserMode, ValueRange valueRange, UnitlessQuirk unitless)
{
const CSSParserToken& token = range.peek();
if (token.type() == DimensionToken || token.type() == NumberToken)
return consumeLength(range, cssParserMode, valueRange, unitless);
if (token.type() == PercentageToken)
return consumePercent(range, valueRange);
if (token.type() != FunctionToken)
return nullptr;
CalcParser calcParser(range, CalculationCategory::Length, valueRange);
if (const CSSCalcValue* calculation = calcParser.value()) {
if (canConsumeCalcValue(calculation->category(), cssParserMode))
return calcParser.consumeValue();
}
return nullptr;
}
RefPtr<CSSPrimitiveValue> consumeAngle(CSSParserTokenRange& range, CSSParserMode cssParserMode, UnitlessQuirk unitless)
{
const CSSParserToken& token = range.peek();
if (token.type() == DimensionToken) {
switch (token.unitType()) {
case CSSUnitType::CSS_DEG:
case CSSUnitType::CSS_RAD:
case CSSUnitType::CSS_GRAD:
case CSSUnitType::CSS_TURN:
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), token.unitType());
default:
return nullptr;
}
}
if (token.type() == NumberToken && shouldAcceptUnitlessValue(token.numericValue(), cssParserMode, unitless))
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), CSSUnitType::CSS_DEG);
if (token.type() != FunctionToken)
return nullptr;
CalcParser calcParser(range, CalculationCategory::Angle, ValueRangeAll);
if (const CSSCalcValue* calculation = calcParser.value()) {
if (calculation->category() == CalculationCategory::Angle)
return calcParser.consumeValue();
}
return nullptr;
}
static RefPtr<CSSPrimitiveValue> consumeAngleOrPercent(CSSParserTokenRange& range, CSSParserMode cssParserMode, ValueRange valueRange, UnitlessQuirk unitless)
{
const CSSParserToken& token = range.peek();
if (token.type() == DimensionToken) {
switch (token.unitType()) {
case CSSUnitType::CSS_DEG:
case CSSUnitType::CSS_RAD:
case CSSUnitType::CSS_GRAD:
case CSSUnitType::CSS_TURN:
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), token.unitType());
default:
return nullptr;
}
}
if (token.type() == NumberToken && shouldAcceptUnitlessValue(token.numericValue(), cssParserMode, unitless))
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), CSSUnitType::CSS_DEG);
if (token.type() == PercentageToken)
return consumePercent(range, valueRange);
if (token.type() != FunctionToken)
return nullptr;
CalcParser angleCalcParser(range, CalculationCategory::Angle, valueRange);
if (const CSSCalcValue* calculation = angleCalcParser.value()) {
if (calculation->category() == CalculationCategory::Angle)
return angleCalcParser.consumeValue();
}
CalcParser percentCalcParser(range, CalculationCategory::Percent, valueRange);
if (const CSSCalcValue* calculation = percentCalcParser.value()) {
if (calculation->category() == CalculationCategory::Percent)
return percentCalcParser.consumeValue();
}
return nullptr;
}
RefPtr<CSSPrimitiveValue> consumeTime(CSSParserTokenRange& range, CSSParserMode cssParserMode, ValueRange valueRange, UnitlessQuirk unitless)
{
const CSSParserToken& token = range.peek();
CSSUnitType unit = token.unitType();
bool acceptUnitless = token.type() == NumberToken && unitless == UnitlessQuirk::Allow && shouldAcceptUnitlessValue(token.numericValue(), cssParserMode, unitless);
if (acceptUnitless)
unit = CSSUnitType::CSS_MS;
if (token.type() == DimensionToken || acceptUnitless) {
if (valueRange == ValueRangeNonNegative && token.numericValue() < 0)
return nullptr;
if (unit == CSSUnitType::CSS_MS || unit == CSSUnitType::CSS_S)
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), unit);
return nullptr;
}
if (token.type() != FunctionToken)
return nullptr;
CalcParser calcParser(range, CalculationCategory::Time, valueRange);
if (const CSSCalcValue* calculation = calcParser.value()) {
if (calculation->category() == CalculationCategory::Time)
return calcParser.consumeValue();
}
return nullptr;
}
RefPtr<CSSPrimitiveValue> consumeResolution(CSSParserTokenRange& range)
{
const CSSParserToken& token = range.peek();
// Unlike the other types, calc() does not work with <resolution>.
if (token.type() != DimensionToken)
return nullptr;
CSSUnitType unit = token.unitType();
if (unit == CSSUnitType::CSS_DPPX || unit == CSSUnitType::CSS_DPI || unit == CSSUnitType::CSS_DPCM)
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().numericValue(), unit);
return nullptr;
}
RefPtr<CSSPrimitiveValue> consumeIdent(CSSParserTokenRange& range)
{
if (range.peek().type() != IdentToken)
return nullptr;
return CSSValuePool::singleton().createIdentifierValue(range.consumeIncludingWhitespace().id());
}
RefPtr<CSSPrimitiveValue> consumeIdentRange(CSSParserTokenRange& range, CSSValueID lower, CSSValueID upper)
{
if (range.peek().id() < lower || range.peek().id() > upper)
return nullptr;
return consumeIdent(range);
}
// FIXME-NEWPARSER: Eventually we'd like this to use CSSCustomIdentValue, but we need
// to do other plumbing work first (like changing Pair to CSSValuePair and make it not
// use only primitive values).
RefPtr<CSSPrimitiveValue> consumeCustomIdent(CSSParserTokenRange& range)
{
if (range.peek().type() != IdentToken || isCSSWideKeyword(range.peek().id()))
return nullptr;
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().value().toString(), CSSUnitType::CSS_STRING);
}
RefPtr<CSSPrimitiveValue> consumeString(CSSParserTokenRange& range)
{
if (range.peek().type() != StringToken)
return nullptr;
return CSSValuePool::singleton().createValue(range.consumeIncludingWhitespace().value().toString(), CSSUnitType::CSS_STRING);
}
StringView consumeUrlAsStringView(CSSParserTokenRange& range)
{
const CSSParserToken& token = range.peek();
if (token.type() == UrlToken) {
range.consumeIncludingWhitespace();
return token.value();
}
if (token.functionId() == CSSValueUrl) {
CSSParserTokenRange urlRange = range;
CSSParserTokenRange urlArgs = urlRange.consumeBlock();
const CSSParserToken& next = urlArgs.consumeIncludingWhitespace();
if (next.type() == BadStringToken || !urlArgs.atEnd())
return StringView();
ASSERT(next.type() == StringToken);
range = urlRange;
range.consumeWhitespace();
return next.value();
}
return StringView();
}
RefPtr<CSSPrimitiveValue> consumeUrl(CSSParserTokenRange& range)
{
StringView url = consumeUrlAsStringView(range);
if (url.isNull())
return nullptr;
return CSSValuePool::singleton().createValue(url.toString(), CSSUnitType::CSS_URI);
}
static int clampRGBComponent(const CSSPrimitiveValue& value)
{
double result = value.doubleValue();
if (value.isPercentage())
result = result / 100.0 * 255.0;
return clampTo<int>(round(result), 0, 255);
}
static Color parseRGBParameters(CSSParserTokenRange& range)
{
ASSERT(range.peek().functionId() == CSSValueRgb || range.peek().functionId() == CSSValueRgba);
Color result;
CSSParserTokenRange args = consumeFunction(range);
RefPtr<CSSPrimitiveValue> colorParameter = consumeNumber(args, ValueRangeAll);
if (!colorParameter)
colorParameter = consumePercent(args, ValueRangeAll);
if (!colorParameter)
return Color();
const bool isPercent = colorParameter->isPercentage();
enum class ColorSyntax {
Commas,
WhitespaceSlash,
};
ColorSyntax syntax = ColorSyntax::Commas;
auto consumeSeparator = [&] {
if (syntax == ColorSyntax::Commas)
return consumeCommaIncludingWhitespace(args);
return true;
};
int colorArray[3];
colorArray[0] = clampRGBComponent(*colorParameter);
for (int i = 1; i < 3; i++) {
if (i == 1)
syntax = consumeCommaIncludingWhitespace(args) ? ColorSyntax::Commas : ColorSyntax::WhitespaceSlash;
else if (!consumeSeparator())
return Color();
colorParameter = isPercent ? consumePercent(args, ValueRangeAll) : consumeNumber(args, ValueRangeAll);
if (!colorParameter)
return Color();
colorArray[i] = clampRGBComponent(*colorParameter);
}
// Historically, alpha was only parsed for rgba(), but css-color-4 specifies that rgba() is a simple alias for rgb().
auto consumeAlphaSeparator = [&] {
if (syntax == ColorSyntax::Commas)
return consumeCommaIncludingWhitespace(args);
return consumeSlashIncludingWhitespace(args);
};
int alphaComponent = 255;
if (consumeAlphaSeparator()) {
double alpha;
if (!consumeNumberRaw(args, alpha)) {
auto alphaPercent = consumePercent(args, ValueRangeAll);
if (!alphaPercent)
return Color();
alpha = alphaPercent->doubleValue() / 100.0;
}
// W3 standard stipulates a 2.55 alpha value multiplication factor.
alphaComponent = static_cast<int>(lroundf(clampTo<double>(alpha, 0.0, 1.0) * 255.0f));
};
result = Color(makeRGBA(colorArray[0], colorArray[1], colorArray[2], alphaComponent));
if (!args.atEnd())
return Color();
return result;
}
static Color parseHSLParameters(CSSParserTokenRange& range, CSSParserMode cssParserMode)
{
ASSERT(range.peek().functionId() == CSSValueHsl || range.peek().functionId() == CSSValueHsla);
CSSParserTokenRange args = consumeFunction(range);
auto hslValue = consumeAngle(args, cssParserMode, UnitlessQuirk::Forbid);
double angleInDegrees;
if (!hslValue) {
hslValue = consumeNumber(args, ValueRangeAll);
if (!hslValue)
return Color();
angleInDegrees = hslValue->doubleValue();
} else
angleInDegrees = hslValue->computeDegrees();
double colorArray[3];
colorArray[0] = fmod(fmod(angleInDegrees, 360.0) + 360.0, 360.0) / 360.0;
bool requiresCommas = false;
for (int i = 1; i < 3; i++) {
if (consumeCommaIncludingWhitespace(args)) {
if (i != 1 && !requiresCommas)
return Color();
requiresCommas = true;
} else if (requiresCommas || args.atEnd() || (&args.peek() - 1)->type() != WhitespaceToken)
return Color();
hslValue = consumePercent(args, ValueRangeAll);
if (!hslValue)
return Color();
double doubleValue = hslValue->doubleValue();
colorArray[i] = clampTo<double>(doubleValue, 0.0, 100.0) / 100.0; // Needs to be value between 0 and 1.0.
}
double alpha = 1.0;
bool commaConsumed = consumeCommaIncludingWhitespace(args);
bool slashConsumed = consumeSlashIncludingWhitespace(args);
if ((commaConsumed && !requiresCommas) || (slashConsumed && requiresCommas))
return Color();
if (commaConsumed || slashConsumed) {
if (!consumeNumberRaw(args, alpha)) {
auto alphaPercent = consumePercent(args, ValueRangeAll);
if (!alphaPercent)
return Color();
alpha = alphaPercent->doubleValue() / 100.0f;
}
alpha = clampTo<double>(alpha, 0.0, 1.0);
}
if (!args.atEnd())
return Color();
return Color(makeRGBAFromHSLA(static_cast<float>(colorArray[0]), static_cast<float>(colorArray[1]), static_cast<float>(colorArray[2]), static_cast<float>(alpha)));
}
static Color parseColorFunctionParameters(CSSParserTokenRange& range)
{
ASSERT(range.peek().functionId() == CSSValueColor);
CSSParserTokenRange args = consumeFunction(range);
ColorSpace colorSpace;
switch (args.peek().id()) {
case CSSValueSRGB:
colorSpace = ColorSpace::SRGB;
break;
case CSSValueDisplayP3:
colorSpace = ColorSpace::DisplayP3;
break;
default:
return Color();
}
consumeIdent(args);
double colorChannels[4] = { 0, 0, 0, 1 };
for (int i = 0; i < 3; ++i) {
double value;
if (consumeNumberRaw(args, value))
colorChannels[i] = std::max(0.0, std::min(1.0, value));
else
break;
}
if (consumeSlashIncludingWhitespace(args)) {
auto alphaParameter = consumePercent(args, ValueRangeAll);
if (!alphaParameter)
alphaParameter = consumeNumber(args, ValueRangeAll);
if (!alphaParameter)
return Color();
colorChannels[3] = std::max(0.0, std::min(1.0, alphaParameter->isPercentage() ? (alphaParameter->doubleValue() / 100) : alphaParameter->doubleValue()));
}
// FIXME: Support the comma-separated list of fallback color values.
if (!args.atEnd())
return Color();
return Color(colorChannels[0], colorChannels[1], colorChannels[2], colorChannels[3], colorSpace);
}
static Color parseHexColor(CSSParserTokenRange& range, bool acceptQuirkyColors)
{
RGBA32 result;
const CSSParserToken& token = range.peek();
if (token.type() == HashToken) {
if (!Color::parseHexColor(token.value(), result))
return Color();
} else if (acceptQuirkyColors) {
String color;
if (token.type() == NumberToken || token.type() == DimensionToken) {
if (token.numericValueType() != IntegerValueType
|| token.numericValue() < 0. || token.numericValue() >= 1000000.)
return Color();
if (token.type() == NumberToken) // e.g. 112233
color = String::number(static_cast<int>(token.numericValue()));
else // e.g. 0001FF
color = makeString(static_cast<int>(token.numericValue()), token.value().toString());
while (color.length() < 6)
color = "0" + color;
} else if (token.type() == IdentToken) { // e.g. FF0000
color = token.value().toString();
}
unsigned length = color.length();
if (length != 3 && length != 6)
return Color();
if (!Color::parseHexColor(color, result))
return Color();
} else {
return Color();
}
range.consumeIncludingWhitespace();
return Color(result);
}
static Color parseColorFunction(CSSParserTokenRange& range, CSSParserMode cssParserMode)
{
CSSParserTokenRange colorRange = range;
CSSValueID functionId = range.peek().functionId();
Color color;
switch (functionId) {
case CSSValueRgb:
case CSSValueRgba:
color = parseRGBParameters(colorRange);
break;
case CSSValueHsl:
case CSSValueHsla:
color = parseHSLParameters(colorRange, cssParserMode);
break;
case CSSValueColor:
color = parseColorFunctionParameters(colorRange);
break;
default:
return Color();
}
if (color.isValid())
range = colorRange;
return color;
}
RefPtr<CSSPrimitiveValue> consumeColor(CSSParserTokenRange& range, CSSParserMode cssParserMode, bool acceptQuirkyColors)
{
CSSValueID id = range.peek().id();
if (StyleColor::isColorKeyword(id)) {
if (!isValueAllowedInMode(id, cssParserMode))
return nullptr;
return consumeIdent(range);
}
Color color = parseHexColor(range, acceptQuirkyColors);
if (!color.isValid())
color = parseColorFunction(range, cssParserMode);
if (!color.isValid())
return nullptr;
return CSSValuePool::singleton().createValue(color);
}
static RefPtr<CSSPrimitiveValue> consumePositionComponent(CSSParserTokenRange& range, CSSParserMode cssParserMode, UnitlessQuirk unitless)
{
if (range.peek().type() == IdentToken)
return consumeIdent<CSSValueLeft, CSSValueTop, CSSValueBottom, CSSValueRight, CSSValueCenter>(range);
return consumeLengthOrPercent(range, cssParserMode, ValueRangeAll, unitless);
}
static bool isHorizontalPositionKeywordOnly(const CSSPrimitiveValue& value)
{
return value.isValueID() && (value.valueID() == CSSValueLeft || value.valueID() == CSSValueRight);
}
static bool isVerticalPositionKeywordOnly(const CSSPrimitiveValue& value)
{
return value.isValueID() && (value.valueID() == CSSValueTop || value.valueID() == CSSValueBottom);
}
static void positionFromOneValue(CSSPrimitiveValue& value, RefPtr<CSSPrimitiveValue>& resultX, RefPtr<CSSPrimitiveValue>& resultY)
{
bool valueAppliesToYAxisOnly = isVerticalPositionKeywordOnly(value);
resultX = &value;
resultY = CSSPrimitiveValue::createIdentifier(CSSValueCenter);
if (valueAppliesToYAxisOnly)
std::swap(resultX, resultY);
}
static bool positionFromTwoValues(CSSPrimitiveValue& value1, CSSPrimitiveValue& value2,
RefPtr<CSSPrimitiveValue>& resultX, RefPtr<CSSPrimitiveValue>& resultY)
{
bool mustOrderAsXY = isHorizontalPositionKeywordOnly(value1) || isVerticalPositionKeywordOnly(value2)
|| !value1.isValueID() || !value2.isValueID();
bool mustOrderAsYX = isVerticalPositionKeywordOnly(value1) || isHorizontalPositionKeywordOnly(value2);
if (mustOrderAsXY && mustOrderAsYX)
return false;
resultX = &value1;
resultY = &value2;
if (mustOrderAsYX)
std::swap(resultX, resultY);
return true;
}
namespace CSSPropertyParserHelpersInternal {
template<typename... Args>
static Ref<CSSPrimitiveValue> createPrimitiveValuePair(Args&&... args)
{
return CSSValuePool::singleton().createValue(Pair::create(std::forward<Args>(args)...));
}
}
// https://drafts.csswg.org/css-backgrounds-3/#propdef-background-position
// background-position has special parsing rules, allowing a 3-value syntax:
// <bg-position> = [ left | center | right | top | bottom | <length-percentage> ]
// |
// [ left | center | right | <length-percentage> ]
// [ top | center | bottom | <length-percentage> ]
// |
// [ center | [ left | right ] <length-percentage>? ] &&
// [ center | [ top | bottom ] <length-percentage>? ]
//
static bool backgroundPositionFromThreeValues(const std::array<CSSPrimitiveValue*, 5>& values, RefPtr<CSSPrimitiveValue>& resultX, RefPtr<CSSPrimitiveValue>& resultY)
{
CSSPrimitiveValue* center = nullptr;
for (int i = 0; values[i]; i++) {
CSSPrimitiveValue* currentValue = values[i];
if (!currentValue->isValueID())
return false;
CSSValueID id = currentValue->valueID();
if (id == CSSValueCenter) {
if (center)
return false;
center = currentValue;
continue;
}
RefPtr<CSSPrimitiveValue> result;
if (values[i + 1] && !values[i + 1]->isValueID())
result = CSSPropertyParserHelpersInternal::createPrimitiveValuePair(currentValue, values[++i]);
else
result = currentValue;
if (id == CSSValueLeft || id == CSSValueRight) {
if (resultX)
return false;
resultX = result;
} else {
ASSERT(id == CSSValueTop || id == CSSValueBottom);
if (resultY)
return false;
resultY = result;
}
}
if (center) {
ASSERT(resultX || resultY);
if (resultX && resultY)
return false;
if (!resultX)
resultX = center;
else
resultY = center;
}
ASSERT(resultX && resultY);
return true;
}
// https://drafts.csswg.org/css-values-4/#typedef-position
// <position> = [
// [ left | center | right ] || [ top | center | bottom ]
// |
// [ left | center | right | <length-percentage> ]
// [ top | center | bottom | <length-percentage> ]?
// |
// [ [ left | right ] <length-percentage> ] &&
// [ [ top | bottom ] <length-percentage> ]
//
static bool positionFromFourValues(const std::array<CSSPrimitiveValue*, 5>& values, RefPtr<CSSPrimitiveValue>& resultX, RefPtr<CSSPrimitiveValue>& resultY)
{
for (int i = 0; values[i]; i++) {
CSSPrimitiveValue* currentValue = values[i];
if (!currentValue->isValueID())
return false;
CSSValueID id = currentValue->valueID();
if (id == CSSValueCenter)
return false;
RefPtr<CSSPrimitiveValue> result;
if (values[i + 1] && !values[i + 1]->isValueID())
result = CSSPropertyParserHelpersInternal::createPrimitiveValuePair(currentValue, values[++i]);
else
result = currentValue;
if (id == CSSValueLeft || id == CSSValueRight) {
if (resultX)
return false;
resultX = result;
} else {
ASSERT(id == CSSValueTop || id == CSSValueBottom);
if (resultY)
return false;
resultY = result;
}
}
ASSERT(resultX && resultY);
return true;
}
// FIXME: This may consume from the range upon failure. The background
// shorthand works around it, but we should just fix it here.
bool consumePosition(CSSParserTokenRange& range, CSSParserMode cssParserMode, UnitlessQuirk unitless, PositionSyntax positionSyntax, RefPtr<CSSPrimitiveValue>& resultX, RefPtr<CSSPrimitiveValue>& resultY)
{
RefPtr<CSSPrimitiveValue> value1 = consumePositionComponent(range, cssParserMode, unitless);
if (!value1)
return false;
RefPtr<CSSPrimitiveValue> value2 = consumePositionComponent(range, cssParserMode, unitless);
if (!value2) {
positionFromOneValue(*value1, resultX, resultY);
return true;
}
RefPtr<CSSPrimitiveValue> value3 = consumePositionComponent(range, cssParserMode, unitless);
if (!value3)
return positionFromTwoValues(*value1, *value2, resultX, resultY);
RefPtr<CSSPrimitiveValue> value4 = consumePositionComponent(range, cssParserMode, unitless);
std::array<CSSPrimitiveValue*, 5> values;
values[0] = value1.get();
values[1] = value2.get();
values[2] = value3.get();
values[3] = value4.get();
values[4] = nullptr;
if (value4)
return positionFromFourValues(values, resultX, resultY);
if (positionSyntax != PositionSyntax::BackgroundPosition)
return false;
return backgroundPositionFromThreeValues(values, resultX, resultY);
}
RefPtr<CSSPrimitiveValue> consumePosition(CSSParserTokenRange& range, CSSParserMode cssParserMode, UnitlessQuirk unitless, PositionSyntax positionSyntax)
{
RefPtr<CSSPrimitiveValue> resultX;
RefPtr<CSSPrimitiveValue> resultY;
if (consumePosition(range, cssParserMode, unitless, positionSyntax, resultX, resultY))
return CSSPropertyParserHelpersInternal::createPrimitiveValuePair(resultX.releaseNonNull(), resultY.releaseNonNull());
return nullptr;
}
bool consumeOneOrTwoValuedPosition(CSSParserTokenRange& range, CSSParserMode cssParserMode, UnitlessQuirk unitless, RefPtr<CSSPrimitiveValue>& resultX, RefPtr<CSSPrimitiveValue>& resultY)
{
RefPtr<CSSPrimitiveValue> value1 = consumePositionComponent(range, cssParserMode, unitless);
if (!value1)
return false;
RefPtr<CSSPrimitiveValue> value2 = consumePositionComponent(range, cssParserMode, unitless);
if (!value2) {
positionFromOneValue(*value1, resultX, resultY);
return true;
}
return positionFromTwoValues(*value1, *value2, resultX, resultY);
}
// This should go away once we drop support for -webkit-gradient
static RefPtr<CSSPrimitiveValue> consumeDeprecatedGradientPoint(CSSParserTokenRange& args, bool horizontal)
{
if (args.peek().type() == IdentToken) {
if ((horizontal && consumeIdent<CSSValueLeft>(args)) || (!horizontal && consumeIdent<CSSValueTop>(args)))
return CSSValuePool::singleton().createValue(0., CSSUnitType::CSS_PERCENTAGE);
if ((horizontal && consumeIdent<CSSValueRight>(args)) || (!horizontal && consumeIdent<CSSValueBottom>(args)))
return CSSValuePool::singleton().createValue(100., CSSUnitType::CSS_PERCENTAGE);
if (consumeIdent<CSSValueCenter>(args))
return CSSValuePool::singleton().createValue(50., CSSUnitType::CSS_PERCENTAGE);
return nullptr;
}
RefPtr<CSSPrimitiveValue> result = consumePercent(args, ValueRangeAll);
if (!result)
result = consumeNumber(args, ValueRangeAll);
return result;
}
// Used to parse colors for -webkit-gradient(...).
static RefPtr<CSSPrimitiveValue> consumeDeprecatedGradientStopColor(CSSParserTokenRange& args, CSSParserMode cssParserMode)
{
if (args.peek().id() == CSSValueCurrentcolor)
return nullptr;
return consumeColor(args, cssParserMode);
}
static bool consumeDeprecatedGradientColorStop(CSSParserTokenRange& range, CSSGradientColorStop& stop, CSSParserMode cssParserMode)
{
CSSValueID id = range.peek().functionId();
if (id != CSSValueFrom && id != CSSValueTo && id != CSSValueColorStop)
return false;
CSSParserTokenRange args = consumeFunction(range);
double position;
if (id == CSSValueFrom || id == CSSValueTo) {
position = (id == CSSValueFrom) ? 0 : 1;
} else {
ASSERT(id == CSSValueColorStop);
if (auto percentValue = consumePercent(args, ValueRangeAll))
position = percentValue->doubleValue() / 100.0;
else if (!consumeNumberRaw(args, position))
return false;
if (!consumeCommaIncludingWhitespace(args))
return false;
}
stop.m_position = CSSValuePool::singleton().createValue(position, CSSUnitType::CSS_NUMBER);
stop.m_color = consumeDeprecatedGradientStopColor(args, cssParserMode);
return stop.m_color && args.atEnd();
}
static RefPtr<CSSValue> consumeDeprecatedGradient(CSSParserTokenRange& args, CSSParserMode cssParserMode)
{
RefPtr<CSSGradientValue> result;
CSSValueID id = args.consumeIncludingWhitespace().id();
bool isDeprecatedRadialGradient = (id == CSSValueRadial);
if (isDeprecatedRadialGradient)
result = CSSRadialGradientValue::create(NonRepeating, CSSDeprecatedRadialGradient);
else if (id == CSSValueLinear)
result = CSSLinearGradientValue::create(NonRepeating, CSSDeprecatedLinearGradient);
if (!result || !consumeCommaIncludingWhitespace(args))
return nullptr;
auto point = consumeDeprecatedGradientPoint(args, true);
if (!point)
return nullptr;
result->setFirstX(point.copyRef());
point = consumeDeprecatedGradientPoint(args, false);
if (!point)
return nullptr;
result->setFirstY(point.copyRef());
if (!consumeCommaIncludingWhitespace(args))
return nullptr;
// For radial gradients only, we now expect a numeric radius.
if (isDeprecatedRadialGradient) {
auto radius = consumeNumber(args, ValueRangeNonNegative);
if (!radius || !consumeCommaIncludingWhitespace(args))
return nullptr;
downcast<CSSRadialGradientValue>(result.get())->setFirstRadius(radius.copyRef());
}
point = consumeDeprecatedGradientPoint(args, true);
if (!point)
return nullptr;
result->setSecondX(point.copyRef());
point = consumeDeprecatedGradientPoint(args, false);
if (!point)
return nullptr;
result->setSecondY(point.copyRef());
// For radial gradients only, we now expect the second radius.
if (isDeprecatedRadialGradient) {
if (!consumeCommaIncludingWhitespace(args))
return nullptr;
auto radius = consumeNumber(args, ValueRangeNonNegative);
if (!radius)
return nullptr;
downcast<CSSRadialGradientValue>(result.get())->setSecondRadius(radius.copyRef());
}
CSSGradientColorStop stop;
while (consumeCommaIncludingWhitespace(args)) {
if (!consumeDeprecatedGradientColorStop(args, stop, cssParserMode))
return nullptr;
result->addStop(stop);
}
result->doneAddingStops();
return result;
}
static bool consumeGradientColorStops(CSSParserTokenRange& range, CSSParserMode cssParserMode, CSSGradientValue& gradient)
{
bool supportsColorHints = gradient.gradientType() == CSSLinearGradient || gradient.gradientType() == CSSRadialGradient || gradient.gradientType() == CSSConicGradient;
bool isConicGradient = gradient.gradientType() == CSSConicGradient;
// The first color stop cannot be a color hint.
bool previousStopWasColorHint = true;
do {
CSSGradientColorStop stop;
stop.m_color = consumeColor(range, cssParserMode);
// Two hints in a row are not allowed.
if (!stop.m_color && (!supportsColorHints || previousStopWasColorHint))
return false;
previousStopWasColorHint = !stop.m_color;
// FIXME-NEWPARSER: This boolean could be removed. Null checking color would be sufficient.
stop.isMidpoint = !stop.m_color;
if (isConicGradient)
stop.m_position = consumeAngleOrPercent(range, cssParserMode, ValueRangeAll, UnitlessQuirk::Forbid);
else
stop.m_position = consumeLengthOrPercent(range, cssParserMode, ValueRangeAll);
if (!stop.m_color && !stop.m_position)
return false;
gradient.addStop(stop);
if (!stop.m_color || !stop.m_position)
continue;
CSSGradientColorStop secondStop;
if (isConicGradient)
secondStop.m_position = consumeAngleOrPercent(range, cssParserMode, ValueRangeAll, UnitlessQuirk::Forbid);
else
secondStop.m_position = consumeLengthOrPercent(range, cssParserMode, ValueRangeAll);
if (secondStop.m_position)
gradient.addStop(secondStop);
} while (consumeCommaIncludingWhitespace(range));
gradient.doneAddingStops();
// The last color stop cannot be a color hint.
if (previousStopWasColorHint)
return false;
// Must have 2 or more stops to be valid.
return gradient.stopCount() >= 2;
}
static RefPtr<CSSValue> consumeDeprecatedRadialGradient(CSSParserTokenRange& args, CSSParserMode cssParserMode, CSSGradientRepeat repeating)
{
RefPtr<CSSRadialGradientValue> result = CSSRadialGradientValue::create(repeating, CSSPrefixedRadialGradient);
RefPtr<CSSPrimitiveValue> centerX;
RefPtr<CSSPrimitiveValue> centerY;
consumeOneOrTwoValuedPosition(args, cssParserMode, UnitlessQuirk::Forbid, centerX, centerY);
if ((centerX || centerY) && !consumeCommaIncludingWhitespace(args))
return nullptr;
result->setFirstX(centerX.copyRef());
result->setFirstY(centerY.copyRef());
result->setSecondX(centerX.copyRef());
result->setSecondY(centerY.copyRef());
auto shape = consumeIdent<CSSValueCircle, CSSValueEllipse>(args);
auto sizeKeyword = consumeIdent<CSSValueClosestSide, CSSValueClosestCorner, CSSValueFarthestSide, CSSValueFarthestCorner, CSSValueContain, CSSValueCover>(args);
if (!shape)
shape = consumeIdent<CSSValueCircle, CSSValueEllipse>(args);
result->setShape(shape.copyRef());
result->setSizingBehavior(sizeKeyword.copyRef());
// Or, two lengths or percentages
if (!shape && !sizeKeyword) {
auto horizontalSize = consumeLengthOrPercent(args, cssParserMode, ValueRangeNonNegative);
RefPtr<CSSPrimitiveValue> verticalSize;
if (horizontalSize) {
verticalSize = consumeLengthOrPercent(args, cssParserMode, ValueRangeNonNegative);
if (!verticalSize)
return nullptr;
consumeCommaIncludingWhitespace(args);
result->setEndHorizontalSize(horizontalSize.copyRef());
result->setEndVerticalSize(verticalSize.copyRef());
}
} else {
consumeCommaIncludingWhitespace(args);
}
if (!consumeGradientColorStops(args, cssParserMode, *result))
return nullptr;
return result;
}
static RefPtr<CSSValue> consumeRadialGradient(CSSParserTokenRange& args, CSSParserMode cssParserMode, CSSGradientRepeat repeating)
{
RefPtr<CSSRadialGradientValue> result = CSSRadialGradientValue::create(repeating, CSSRadialGradient);
RefPtr<CSSPrimitiveValue> shape;
RefPtr<CSSPrimitiveValue> sizeKeyword;
RefPtr<CSSPrimitiveValue> horizontalSize;
RefPtr<CSSPrimitiveValue> verticalSize;
// First part of grammar, the size/shape clause:
// [ circle || <length> ] |
// [ ellipse || [ <length> | <percentage> ]{2} ] |
// [ [ circle | ellipse] || <size-keyword> ]
for (int i = 0; i < 3; ++i) {
if (args.peek().type() == IdentToken) {
CSSValueID id = args.peek().id();
if (id == CSSValueCircle || id == CSSValueEllipse) {
if (shape)
return nullptr;
shape = consumeIdent(args);
} else if (id == CSSValueClosestSide || id == CSSValueClosestCorner || id == CSSValueFarthestSide || id == CSSValueFarthestCorner) {
if (sizeKeyword)
return nullptr;
sizeKeyword = consumeIdent(args);
} else {
break;
}
} else {
auto center = consumeLengthOrPercent(args, cssParserMode, ValueRangeNonNegative);
if (!center)
break;
if (horizontalSize)
return nullptr;
horizontalSize = center;
center = consumeLengthOrPercent(args, cssParserMode, ValueRangeNonNegative);
if (center) {
verticalSize = center;
++i;
}
}
}
// You can specify size as a keyword or a length/percentage, not both.
if (sizeKeyword && horizontalSize)
return nullptr;
// Circles must have 0 or 1 lengths.
if (shape && shape->valueID() == CSSValueCircle && verticalSize)
return nullptr;
// Ellipses must have 0 or 2 length/percentages.
if (shape && shape->valueID() == CSSValueEllipse && horizontalSize && !verticalSize)
return nullptr;
// If there's only one size, it must be a length.
if (!verticalSize && horizontalSize && horizontalSize->isPercentage())
return nullptr;
if ((horizontalSize && horizontalSize->isCalculatedPercentageWithLength())
|| (verticalSize && verticalSize->isCalculatedPercentageWithLength()))
return nullptr;
result->setShape(shape.copyRef());
result->setSizingBehavior(sizeKeyword.copyRef());
result->setEndHorizontalSize(horizontalSize.copyRef());
result->setEndVerticalSize(verticalSize.copyRef());
RefPtr<CSSPrimitiveValue> centerX;
RefPtr<CSSPrimitiveValue> centerY;
if (args.peek().id() == CSSValueAt) {
args.consumeIncludingWhitespace();
consumePosition(args, cssParserMode, UnitlessQuirk::Forbid, PositionSyntax::Position, centerX, centerY);
if (!(centerX && centerY))
return nullptr;
result->setFirstX(centerX.copyRef());
result->setFirstY(centerY.copyRef());
// Right now, CSS radial gradients have the same start and end centers.
result->setSecondX(centerX.copyRef());
result->setSecondY(centerY.copyRef());
}
if ((shape || sizeKeyword || horizontalSize || centerX || centerY) && !consumeCommaIncludingWhitespace(args))
return nullptr;
if (!consumeGradientColorStops(args, cssParserMode, *result))
return nullptr;
return result;
}
static RefPtr<CSSValue> consumeLinearGradient(CSSParserTokenRange& args, CSSParserMode cssParserMode, CSSGradientRepeat repeating, CSSGradientType gradientType)
{
RefPtr<CSSLinearGradientValue> result = CSSLinearGradientValue::create(repeating, gradientType);
bool expectComma = true;
RefPtr<CSSPrimitiveValue> angle = consumeAngle(args, cssParserMode, UnitlessQuirk::Forbid);
if (angle)
result->setAngle(angle.releaseNonNull());
else if (gradientType == CSSPrefixedLinearGradient || consumeIdent<CSSValueTo>(args)) {
RefPtr<CSSPrimitiveValue> endX = consumeIdent<CSSValueLeft, CSSValueRight>(args);
RefPtr<CSSPrimitiveValue> endY = consumeIdent<CSSValueBottom, CSSValueTop>(args);
if (!endX && !endY) {
if (gradientType == CSSLinearGradient)
return nullptr;
endY = CSSPrimitiveValue::createIdentifier(CSSValueTop);
expectComma = false;
} else if (!endX) {
endX = consumeIdent<CSSValueLeft, CSSValueRight>(args);
}
result->setFirstX(endX.copyRef());
result->setFirstY(endY.copyRef());
} else {
expectComma = false;
}
if (expectComma && !consumeCommaIncludingWhitespace(args))
return nullptr;
if (!consumeGradientColorStops(args, cssParserMode, *result))
return nullptr;
return result;
}
static RefPtr<CSSValue> consumeConicGradient(CSSParserTokenRange& args, CSSParserContext context, CSSGradientRepeat repeating)
{
#if ENABLE(CSS_CONIC_GRADIENTS)
RefPtr<CSSConicGradientValue> result = CSSConicGradientValue::create(repeating);
bool expectComma = false;
if (args.peek().type() == IdentToken) {
if (consumeIdent<CSSValueFrom>(args)) {
auto angle = consumeAngle(args, context.mode, UnitlessQuirk::Forbid);
if (!angle)
return nullptr;
result->setAngle(angle.releaseNonNull());
expectComma = true;
}
if (consumeIdent<CSSValueAt>(args)) {
RefPtr<CSSPrimitiveValue> centerX;
RefPtr<CSSPrimitiveValue> centerY;
consumePosition(args, context.mode, UnitlessQuirk::Forbid, PositionSyntax::Position, centerX, centerY);
if (!(centerX && centerY))
return nullptr;
result->setFirstX(centerX.copyRef());
result->setFirstY(centerY.copyRef());
// Right now, conic gradients have the same start and end centers.
result->setSecondX(centerX.copyRef());
result->setSecondY(centerY.copyRef());
expectComma = true;
}
}
if (expectComma && !consumeCommaIncludingWhitespace(args))
return nullptr;
if (!consumeGradientColorStops(args, context.mode, *result))
return nullptr;
return result;
#else
UNUSED_PARAM(args);
UNUSED_PARAM(context);
UNUSED_PARAM(repeating);
return nullptr;
#endif
}
RefPtr<CSSValue> consumeImageOrNone(CSSParserTokenRange& range, CSSParserContext context)
{
if (range.peek().id() == CSSValueNone)
return consumeIdent(range);
return consumeImage(range, context);
}
static RefPtr<CSSValue> consumeCrossFade(CSSParserTokenRange& args, CSSParserContext context, bool prefixed)
{
RefPtr<CSSValue> fromImageValue = consumeImageOrNone(args, context);
if (!fromImageValue || !consumeCommaIncludingWhitespace(args))
return nullptr;
RefPtr<CSSValue> toImageValue = consumeImageOrNone(args, context);
if (!toImageValue || !consumeCommaIncludingWhitespace(args))
return nullptr;
RefPtr<CSSPrimitiveValue> percentage;
if (auto percentValue = consumePercent(args, ValueRangeAll))
percentage = CSSValuePool::singleton().createValue(clampTo<double>(percentValue->doubleValue() / 100.0, 0, 1), CSSUnitType::CSS_NUMBER);
else if (auto numberValue = consumeNumber(args, ValueRangeAll))
percentage = CSSValuePool::singleton().createValue(clampTo<double>(numberValue->doubleValue(), 0, 1), CSSUnitType::CSS_NUMBER);
if (!percentage)
return nullptr;
return CSSCrossfadeValue::create(fromImageValue.releaseNonNull(), toImageValue.releaseNonNull(), percentage.releaseNonNull(), prefixed);
}
static RefPtr<CSSValue> consumeWebkitCanvas(CSSParserTokenRange& args)
{
if (args.peek().type() != IdentToken)
return nullptr;
auto canvasName = args.consumeIncludingWhitespace().value().toString();
if (!args.atEnd())
return nullptr;
return CSSCanvasValue::create(canvasName);
}
static RefPtr<CSSValue> consumeWebkitNamedImage(CSSParserTokenRange& args)
{
if (args.peek().type() != IdentToken)
return nullptr;
auto imageName = args.consumeIncludingWhitespace().value().toString();
if (!args.atEnd())
return nullptr;
return CSSNamedImageValue::create(imageName);
}
static RefPtr<CSSValue> consumeFilterImage(CSSParserTokenRange& args, const CSSParserContext& context)
{
auto imageValue = consumeImageOrNone(args, context);
if (!imageValue || !consumeCommaIncludingWhitespace(args))
return nullptr;
auto filterValue = consumeFilter(args, context, AllowedFilterFunctions::PixelFilters);
if (!filterValue)
return nullptr;
if (!args.atEnd())
return nullptr;
return CSSFilterImageValue::create(imageValue.releaseNonNull(), filterValue.releaseNonNull());
}
#if ENABLE(CSS_PAINTING_API)
static RefPtr<CSSValue> consumeCustomPaint(CSSParserTokenRange& args)
{
if (!RuntimeEnabledFeatures::sharedFeatures().cssPaintingAPIEnabled())
return nullptr;
if (args.peek().type() != IdentToken)
return nullptr;
auto name = args.consumeIncludingWhitespace().value().toString();
if (!args.atEnd() && args.peek() != CommaToken)
return nullptr;
if (!args.atEnd())
args.consume();
auto argumentList = CSSVariableData::create(args);
while (!args.atEnd())
args.consume();
return CSSPaintImageValue::create(name, WTFMove(argumentList));
}
#endif
static RefPtr<CSSValue> consumeGeneratedImage(CSSParserTokenRange& range, CSSParserContext context)
{
CSSValueID id = range.peek().functionId();
CSSParserTokenRange rangeCopy = range;
CSSParserTokenRange args = consumeFunction(rangeCopy);
RefPtr<CSSValue> result;
if (id == CSSValueRadialGradient)
result = consumeRadialGradient(args, context.mode, NonRepeating);
else if (id == CSSValueRepeatingRadialGradient)
result = consumeRadialGradient(args, context.mode, Repeating);
else if (id == CSSValueWebkitLinearGradient)
result = consumeLinearGradient(args, context.mode, NonRepeating, CSSPrefixedLinearGradient);
else if (id == CSSValueWebkitRepeatingLinearGradient)
result = consumeLinearGradient(args, context.mode, Repeating, CSSPrefixedLinearGradient);
else if (id == CSSValueRepeatingLinearGradient)
result = consumeLinearGradient(args, context.mode, Repeating, CSSLinearGradient);
else if (id == CSSValueLinearGradient)
result = consumeLinearGradient(args, context.mode, NonRepeating, CSSLinearGradient);
else if (id == CSSValueWebkitGradient)
result = consumeDeprecatedGradient(args, context.mode);
else if (id == CSSValueWebkitRadialGradient)
result = consumeDeprecatedRadialGradient(args, context.mode, NonRepeating);
else if (id == CSSValueWebkitRepeatingRadialGradient)
result = consumeDeprecatedRadialGradient(args, context.mode, Repeating);
else if (id == CSSValueConicGradient)
result = consumeConicGradient(args, context, NonRepeating);
else if (id == CSSValueRepeatingConicGradient)
result = consumeConicGradient(args, context, Repeating);
else if (id == CSSValueWebkitCrossFade || id == CSSValueCrossFade)
result = consumeCrossFade(args, context, id == CSSValueWebkitCrossFade);
else if (id == CSSValueWebkitCanvas)
result = consumeWebkitCanvas(args);
else if (id == CSSValueWebkitNamedImage)
result = consumeWebkitNamedImage(args);
else if (id == CSSValueWebkitFilter || id == CSSValueFilter)
result = consumeFilterImage(args, context);
#if ENABLE(CSS_PAINTING_API)
else if (id == CSSValuePaint)
result = consumeCustomPaint(args);
#endif
if (!result || !args.atEnd())
return nullptr;
range = rangeCopy;
return result;
}
static StringView consumeUrlOrStringAsStringView(CSSParserTokenRange& args)
{
if (args.peek().type() == StringToken)
return args.consumeIncludingWhitespace().value();
return consumeUrlAsStringView(args);
}
static RefPtr<CSSValue> consumeImageSet(CSSParserTokenRange& range, const CSSParserContext& context)
{
CSSParserTokenRange rangeCopy = range;
CSSParserTokenRange args = consumeFunction(rangeCopy);
RefPtr<CSSImageSetValue> imageSet = CSSImageSetValue::create(context.isContentOpaque ? LoadedFromOpaqueSource::Yes : LoadedFromOpaqueSource::No);
do {
AtomString urlValue = consumeUrlOrStringAsStringView(args).toAtomString();
if (urlValue.isNull())
return nullptr;
RefPtr<CSSValue> image = CSSImageValue::create(completeURL(context, urlValue), context.isContentOpaque ? LoadedFromOpaqueSource::Yes : LoadedFromOpaqueSource::No);
imageSet->append(image.releaseNonNull());
const CSSParserToken& token = args.consumeIncludingWhitespace();
if (token.type() != DimensionToken)
return nullptr;
if (token.value() != "x")
return nullptr;
ASSERT(token.unitType() == CSSUnitType::CSS_UNKNOWN);
double imageScaleFactor = token.numericValue();
if (imageScaleFactor <= 0)
return nullptr;
imageSet->append(CSSValuePool::singleton().createValue(imageScaleFactor, CSSUnitType::CSS_NUMBER));
} while (consumeCommaIncludingWhitespace(args));
if (!args.atEnd())
return nullptr;
range = rangeCopy;
return imageSet;
}
static bool isGeneratedImage(CSSValueID id)
{
return id == CSSValueLinearGradient
|| id == CSSValueRadialGradient
|| id == CSSValueConicGradient
|| id == CSSValueRepeatingLinearGradient
|| id == CSSValueRepeatingRadialGradient
|| id == CSSValueRepeatingConicGradient
|| id == CSSValueWebkitLinearGradient
|| id == CSSValueWebkitRadialGradient
|| id == CSSValueWebkitRepeatingLinearGradient
|| id == CSSValueWebkitRepeatingRadialGradient
|| id == CSSValueWebkitGradient
|| id == CSSValueWebkitCrossFade
|| id == CSSValueWebkitCanvas
|| id == CSSValueCrossFade
|| id == CSSValueWebkitNamedImage
|| id == CSSValueWebkitFilter
#if ENABLE(CSS_PAINTING_API)
|| id == CSSValuePaint
#endif
|| id == CSSValueFilter;
}
static bool isPixelFilterFunction(CSSValueID filterFunction)
{
switch (filterFunction) {
case CSSValueBlur:
case CSSValueBrightness:
case CSSValueContrast:
case CSSValueDropShadow:
case CSSValueGrayscale:
case CSSValueHueRotate:
case CSSValueInvert:
case CSSValueOpacity:
case CSSValueSaturate:
case CSSValueSepia:
return true;
default:
return false;
}
}
static bool isColorFilterFunction(CSSValueID filterFunction)
{
switch (filterFunction) {
case CSSValueBrightness:
case CSSValueContrast:
case CSSValueGrayscale:
case CSSValueHueRotate:
case CSSValueInvert:
case CSSValueOpacity:
case CSSValueSaturate:
case CSSValueSepia:
case CSSValueAppleInvertLightness:
return true;
default:
return false;
}
}
static bool allowsValuesGreaterThanOne(CSSValueID filterFunction)
{
switch (filterFunction) {
case CSSValueBrightness:
case CSSValueContrast:
case CSSValueSaturate:
return true;
default:
return false;
}
}
static RefPtr<CSSFunctionValue> consumeFilterFunction(CSSParserTokenRange& range, const CSSParserContext& context, AllowedFilterFunctions allowedFunctions)
{
CSSValueID filterType = range.peek().functionId();
switch (allowedFunctions) {
case AllowedFilterFunctions::PixelFilters:
if (!isPixelFilterFunction(filterType))
return nullptr;
break;
case AllowedFilterFunctions::ColorFilters:
if (!isColorFilterFunction(filterType))
return nullptr;
break;
}
CSSParserTokenRange args = consumeFunction(range);
RefPtr<CSSFunctionValue> filterValue = CSSFunctionValue::create(filterType);
if (filterType == CSSValueAppleInvertLightness) {
if (!args.atEnd())
return nullptr;
return filterValue;
}
RefPtr<CSSValue> parsedValue;
if (filterType == CSSValueDropShadow)
parsedValue = consumeSingleShadow(args, context.mode, false, false);
else {
if (args.atEnd())
return filterValue;
if (filterType == CSSValueHueRotate)
parsedValue = consumeAngle(args, context.mode, UnitlessQuirk::Forbid);
else if (filterType == CSSValueBlur)
parsedValue = consumeLength(args, HTMLStandardMode, ValueRangeNonNegative);
else {
parsedValue = consumePercent(args, ValueRangeNonNegative);
if (!parsedValue)
parsedValue = consumeNumber(args, ValueRangeNonNegative);
if (parsedValue && !allowsValuesGreaterThanOne(filterType)) {
bool isPercentage = downcast<CSSPrimitiveValue>(*parsedValue).isPercentage();
double maxAllowed = isPercentage ? 100.0 : 1.0;
if (downcast<CSSPrimitiveValue>(*parsedValue).doubleValue() > maxAllowed)
parsedValue = CSSPrimitiveValue::create(maxAllowed, isPercentage ? CSSUnitType::CSS_PERCENTAGE : CSSUnitType::CSS_NUMBER);
}
}
}
if (!parsedValue || !args.atEnd())
return nullptr;
filterValue->append(parsedValue.releaseNonNull());
return filterValue;
}
RefPtr<CSSValue> consumeFilter(CSSParserTokenRange& range, const CSSParserContext& context, AllowedFilterFunctions allowedFunctions)
{
if (range.peek().id() == CSSValueNone)
return consumeIdent(range);
bool referenceFiltersAllowed = allowedFunctions == AllowedFilterFunctions::PixelFilters;
auto list = CSSValueList::createSpaceSeparated();
do {
RefPtr<CSSValue> filterValue = referenceFiltersAllowed ? consumeUrl(range) : nullptr;
if (!filterValue) {
filterValue = consumeFilterFunction(range, context, allowedFunctions);
if (!filterValue)
return nullptr;
}
list->append(filterValue.releaseNonNull());
} while (!range.atEnd());
return list.ptr();
}
RefPtr<CSSShadowValue> consumeSingleShadow(CSSParserTokenRange& range, CSSParserMode cssParserMode, bool allowInset, bool allowSpread)
{
RefPtr<CSSPrimitiveValue> style;
RefPtr<CSSPrimitiveValue> color;
if (range.atEnd())
return nullptr;
if (range.peek().id() == CSSValueInset) {
if (!allowInset)
return nullptr;
style = consumeIdent(range);
}
color = consumeColor(range, cssParserMode);
auto horizontalOffset = consumeLength(range, cssParserMode, ValueRangeAll);
if (!horizontalOffset)
return nullptr;
auto verticalOffset = consumeLength(range, cssParserMode, ValueRangeAll);
if (!verticalOffset)
return nullptr;
RefPtr<CSSPrimitiveValue> blurRadius;
RefPtr<CSSPrimitiveValue> spreadDistance;
const CSSParserToken& token = range.peek();
// The explicit check for calc() is unfortunate. This is ensuring that we only fail parsing if there is a length, but it fails the range check.
if (token.type() == DimensionToken || token.type() == NumberToken || (token.type() == FunctionToken && CSSCalcValue::isCalcFunction(token.functionId()))) {
blurRadius = consumeLength(range, cssParserMode, ValueRangeNonNegative);
if (!blurRadius)
return nullptr;
}
if (blurRadius && allowSpread)
spreadDistance = consumeLength(range, cssParserMode, ValueRangeAll);
if (!range.atEnd()) {
if (!color)
color = consumeColor(range, cssParserMode);
if (range.peek().id() == CSSValueInset) {
if (!allowInset || style)
return nullptr;
style = consumeIdent(range);
}
}
return CSSShadowValue::create(WTFMove(horizontalOffset), WTFMove(verticalOffset), WTFMove(blurRadius), WTFMove(spreadDistance), WTFMove(style), WTFMove(color));
}
RefPtr<CSSValue> consumeImage(CSSParserTokenRange& range, CSSParserContext context, ConsumeGeneratedImage generatedImage)
{
AtomString uri = consumeUrlAsStringView(range).toAtomString();
if (!uri.isNull())
return CSSImageValue::create(completeURL(context, uri), context.isContentOpaque ? LoadedFromOpaqueSource::Yes : LoadedFromOpaqueSource::No);
if (range.peek().type() == FunctionToken) {
CSSValueID id = range.peek().functionId();
if (id == CSSValueWebkitImageSet || id == CSSValueImageSet)
return consumeImageSet(range, context);
if (generatedImage == ConsumeGeneratedImage::Allow && isGeneratedImage(id))
return consumeGeneratedImage(range, context);
}
return nullptr;
}
} // namespace CSSPropertyParserHelpers
} // namespace WebCore