blob: ca8c9840c3d27eff5c4587364ff3a5eb91e870b8 [file] [log] [blame]
/*
* Copyright (C) 2004, 2005, 2006 Nikolas Zimmermann <zimmermann@kde.org>
* Copyright (C) 2004, 2005, 2006, 2007 Rob Buis <buis@kde.org>
* Copyright (C) 2007-2019 Apple Inc. All rights reserved.
*
* 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.
*/
#include "config.h"
#include "SVGLengthValue.h"
#include "AnimationUtilities.h"
#include "CSSPrimitiveValue.h"
#include "SVGLengthContext.h"
#include "SVGParserUtilities.h"
#include <wtf/text/StringConcatenateNumbers.h>
#include <wtf/text/StringParsingBuffer.h>
#include <wtf/text/TextStream.h>
namespace WebCore {
static inline const char* lengthTypeToString(SVGLengthType lengthType)
{
switch (lengthType) {
case SVGLengthType::Unknown:
case SVGLengthType::Number:
return "";
case SVGLengthType::Percentage:
return "%";
case SVGLengthType::Ems:
return "em";
case SVGLengthType::Exs:
return "ex";
case SVGLengthType::Pixels:
return "px";
case SVGLengthType::Centimeters:
return "cm";
case SVGLengthType::Millimeters:
return "mm";
case SVGLengthType::Inches:
return "in";
case SVGLengthType::Points:
return "pt";
case SVGLengthType::Picas:
return "pc";
}
ASSERT_NOT_REACHED();
return "";
}
template<typename CharacterType> static inline SVGLengthType parseLengthType(StringParsingBuffer<CharacterType>& buffer)
{
if (buffer.atEnd())
return SVGLengthType::Number;
auto firstChar = *buffer++;
if (buffer.atEnd())
return firstChar == '%' ? SVGLengthType::Percentage : SVGLengthType::Unknown;
auto secondChar = *buffer++;
if (!buffer.atEnd())
return SVGLengthType::Unknown;
if (firstChar == 'e' && secondChar == 'm')
return SVGLengthType::Ems;
if (firstChar == 'e' && secondChar == 'x')
return SVGLengthType::Exs;
if (firstChar == 'p' && secondChar == 'x')
return SVGLengthType::Pixels;
if (firstChar == 'c' && secondChar == 'm')
return SVGLengthType::Centimeters;
if (firstChar == 'm' && secondChar == 'm')
return SVGLengthType::Millimeters;
if (firstChar == 'i' && secondChar == 'n')
return SVGLengthType::Inches;
if (firstChar == 'p' && secondChar == 't')
return SVGLengthType::Points;
if (firstChar == 'p' && secondChar == 'c')
return SVGLengthType::Picas;
return SVGLengthType::Unknown;
}
static inline SVGLengthType primitiveTypeToLengthType(CSSUnitType primitiveType)
{
switch (primitiveType) {
case CSSUnitType::CSS_UNKNOWN:
return SVGLengthType::Unknown;
case CSSUnitType::CSS_NUMBER:
return SVGLengthType::Number;
case CSSUnitType::CSS_PERCENTAGE:
return SVGLengthType::Percentage;
case CSSUnitType::CSS_EMS:
return SVGLengthType::Ems;
case CSSUnitType::CSS_EXS:
return SVGLengthType::Exs;
case CSSUnitType::CSS_PX:
return SVGLengthType::Pixels;
case CSSUnitType::CSS_CM:
return SVGLengthType::Centimeters;
case CSSUnitType::CSS_MM:
return SVGLengthType::Millimeters;
case CSSUnitType::CSS_IN:
return SVGLengthType::Inches;
case CSSUnitType::CSS_PT:
return SVGLengthType::Points;
case CSSUnitType::CSS_PC:
return SVGLengthType::Picas;
default:
return SVGLengthType::Unknown;
}
return SVGLengthType::Unknown;
}
static inline CSSUnitType lengthTypeToPrimitiveType(SVGLengthType lengthType)
{
switch (lengthType) {
case SVGLengthType::Unknown:
return CSSUnitType::CSS_UNKNOWN;
case SVGLengthType::Number:
return CSSUnitType::CSS_NUMBER;
case SVGLengthType::Percentage:
return CSSUnitType::CSS_PERCENTAGE;
case SVGLengthType::Ems:
return CSSUnitType::CSS_EMS;
case SVGLengthType::Exs:
return CSSUnitType::CSS_EXS;
case SVGLengthType::Pixels:
return CSSUnitType::CSS_PX;
case SVGLengthType::Centimeters:
return CSSUnitType::CSS_CM;
case SVGLengthType::Millimeters:
return CSSUnitType::CSS_MM;
case SVGLengthType::Inches:
return CSSUnitType::CSS_IN;
case SVGLengthType::Points:
return CSSUnitType::CSS_PT;
case SVGLengthType::Picas:
return CSSUnitType::CSS_PC;
}
ASSERT_NOT_REACHED();
return CSSUnitType::CSS_UNKNOWN;
}
SVGLengthValue::SVGLengthValue(SVGLengthMode lengthMode, const String& valueAsString)
: m_lengthMode(lengthMode)
{
setValueAsString(valueAsString);
}
SVGLengthValue::SVGLengthValue(float valueInSpecifiedUnits, SVGLengthType lengthType, SVGLengthMode lengthMode)
: m_valueInSpecifiedUnits(valueInSpecifiedUnits)
, m_lengthType(lengthType)
, m_lengthMode(lengthMode)
{
ASSERT(m_lengthType != SVGLengthType::Unknown);
}
SVGLengthValue::SVGLengthValue(const SVGLengthContext& context, float value, SVGLengthType lengthType, SVGLengthMode lengthMode)
: m_lengthType(lengthType)
, m_lengthMode(lengthMode)
{
setValue(context, value);
}
Optional<SVGLengthValue> SVGLengthValue::construct(SVGLengthMode lengthMode, StringView valueAsString)
{
SVGLengthValue length { lengthMode };
if (length.setValueAsString(valueAsString).hasException())
return WTF::nullopt;
return length;
}
SVGLengthValue SVGLengthValue::construct(SVGLengthMode lengthMode, StringView valueAsString, SVGParsingError& parseError, SVGLengthNegativeValuesMode negativeValuesMode)
{
SVGLengthValue length(lengthMode);
if (length.setValueAsString(valueAsString).hasException())
parseError = ParsingAttributeFailedError;
else if (negativeValuesMode == SVGLengthNegativeValuesMode::Forbid && length.valueInSpecifiedUnits() < 0)
parseError = NegativeValueForbiddenError;
return length;
}
SVGLengthValue SVGLengthValue::blend(const SVGLengthValue& from, const SVGLengthValue& to, float progress)
{
if ((from.isZero() && to.isZero())
|| from.lengthType() == SVGLengthType::Unknown
|| to.lengthType() == SVGLengthType::Unknown
|| (!from.isZero() && from.lengthType() != SVGLengthType::Percentage && to.lengthType() == SVGLengthType::Percentage)
|| (!to.isZero() && from.lengthType() == SVGLengthType::Percentage && to.lengthType() != SVGLengthType::Percentage)
|| (!from.isZero() && !to.isZero() && (from.lengthType() == SVGLengthType::Ems || from.lengthType() == SVGLengthType::Exs) && from.lengthType() != to.lengthType()))
return to;
if (from.lengthType() == SVGLengthType::Percentage || to.lengthType() == SVGLengthType::Percentage) {
auto fromPercent = from.valueAsPercentage() * 100;
auto toPercent = to.valueAsPercentage() * 100;
return { WebCore::blend(fromPercent, toPercent, progress), SVGLengthType::Percentage };
}
if (from.lengthType() == to.lengthType() || from.isZero() || to.isZero() || from.isRelative()) {
auto fromValue = from.valueInSpecifiedUnits();
auto toValue = to.valueInSpecifiedUnits();
return { WebCore::blend(fromValue, toValue, progress), to.isZero() ? from.lengthType() : to.lengthType() };
}
SVGLengthContext nonRelativeLengthContext(nullptr);
auto fromValueInUserUnits = nonRelativeLengthContext.convertValueToUserUnits(from.valueInSpecifiedUnits(), from.lengthType(), from.lengthMode());
if (fromValueInUserUnits.hasException())
return { };
auto fromValue = nonRelativeLengthContext.convertValueFromUserUnits(fromValueInUserUnits.releaseReturnValue(), to.lengthType(), to.lengthMode());
if (fromValue.hasException())
return { };
float toValue = to.valueInSpecifiedUnits();
return { WebCore::blend(fromValue.releaseReturnValue(), toValue, progress), to.lengthType() };
}
SVGLengthValue SVGLengthValue::fromCSSPrimitiveValue(const CSSPrimitiveValue& value)
{
// FIXME: This needs to call value.computeLength() so it can correctly resolve non-absolute units (webkit.org/b/204826).
SVGLengthType lengthType = primitiveTypeToLengthType(value.primitiveType());
return lengthType == SVGLengthType::Unknown ? SVGLengthValue() : SVGLengthValue(value.floatValue(), lengthType);
}
Ref<CSSPrimitiveValue> SVGLengthValue::toCSSPrimitiveValue(const SVGLengthValue& length)
{
return CSSPrimitiveValue::create(length.valueInSpecifiedUnits(), lengthTypeToPrimitiveType(length.lengthType()));
}
ExceptionOr<void> SVGLengthValue::setValueAsString(StringView valueAsString, SVGLengthMode lengthMode)
{
m_valueInSpecifiedUnits = 0;
m_lengthMode = lengthMode;
m_lengthType = SVGLengthType::Number;
return setValueAsString(valueAsString);
}
float SVGLengthValue::value(const SVGLengthContext& context) const
{
auto result = valueForBindings(context);
if (result.hasException())
return 0;
return result.releaseReturnValue();
}
String SVGLengthValue::valueAsString() const
{
return makeString(m_valueInSpecifiedUnits, lengthTypeToString(m_lengthType));
}
ExceptionOr<float> SVGLengthValue::valueForBindings(const SVGLengthContext& context) const
{
return context.convertValueToUserUnits(m_valueInSpecifiedUnits, m_lengthType, m_lengthMode);
}
ExceptionOr<void> SVGLengthValue::setValue(const SVGLengthContext& context, float value)
{
// 100% = 100.0 instead of 1.0 for historical reasons, this could eventually be changed
if (m_lengthType == SVGLengthType::Percentage)
value = value / 100;
auto convertedValue = context.convertValueFromUserUnits(value, m_lengthType, m_lengthMode);
if (convertedValue.hasException())
return convertedValue.releaseException();
m_valueInSpecifiedUnits = convertedValue.releaseReturnValue();
return { };
}
ExceptionOr<void> SVGLengthValue::setValue(const SVGLengthContext& context, float value, SVGLengthType lengthType, SVGLengthMode lengthMode)
{
// FIXME: Seems like a bug that we change the value of m_unit even if setValue throws an exception.
m_lengthMode = lengthMode;
m_lengthType = lengthType;
return setValue(context, value);
}
ExceptionOr<void> SVGLengthValue::setValueAsString(StringView string)
{
if (string.isEmpty())
return { };
return readCharactersForParsing(string, [&](auto buffer) -> ExceptionOr<void> {
auto convertedNumber = parseNumber(buffer, SuffixSkippingPolicy::DontSkip);
if (!convertedNumber)
return Exception { SyntaxError };
auto lengthType = parseLengthType(buffer);
if (lengthType == SVGLengthType::Unknown)
return Exception { SyntaxError };
m_lengthType = lengthType;
m_valueInSpecifiedUnits = *convertedNumber;
return { };
});
}
ExceptionOr<void> SVGLengthValue::convertToSpecifiedUnits(const SVGLengthContext& context, SVGLengthType lengthType)
{
auto valueInUserUnits = valueForBindings(context);
if (valueInUserUnits.hasException())
return valueInUserUnits.releaseException();
auto originalLengthType = m_lengthType;
m_lengthType = lengthType;
auto result = setValue(context, valueInUserUnits.releaseReturnValue());
if (!result.hasException())
return { };
m_lengthType = originalLengthType;
return result.releaseException();
}
TextStream& operator<<(TextStream& ts, const SVGLengthValue& length)
{
ts << length.valueAsString();
return ts;
}
}