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/*
* Copyright (C) 2006, 2007, 2008, 2009, 2010 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 "StepRange.h"
#include "HTMLNames.h"
#include "HTMLParserIdioms.h"
#include <wtf/MathExtras.h>
#include <wtf/text/WTFString.h>
using namespace std;
namespace WebCore {
using namespace HTMLNames;
StepRange::StepRange()
: m_maximum(100)
, m_minimum(0)
, m_step(1)
, m_stepBase(0)
, m_stepBaseDecimalPlaces(0)
, m_stepDecimalPlaces(0)
, m_hasStep(false)
{
}
StepRange::StepRange(const StepRange& stepRange)
: m_maximum(stepRange.m_maximum)
, m_minimum(stepRange.m_minimum)
, m_step(stepRange.m_step)
, m_stepBase(stepRange.m_stepBase)
, m_stepDescription(stepRange.m_stepDescription)
, m_stepBaseDecimalPlaces(stepRange.m_stepBaseDecimalPlaces)
, m_stepDecimalPlaces(stepRange.m_stepDecimalPlaces)
, m_hasStep(stepRange.m_hasStep)
{
}
StepRange::StepRange(const DoubleWithDecimalPlaces& stepBase, double minimum, double maximum, const DoubleWithDecimalPlacesOrMissing& step, const StepDescription& stepDescription)
: m_maximum(maximum)
, m_minimum(minimum)
, m_step(step.value.value)
, m_stepBase(stepBase.value)
, m_stepDescription(stepDescription)
, m_stepBaseDecimalPlaces(stepBase.decimalPlaces)
, m_stepDecimalPlaces(step.value.decimalPlaces)
, m_hasStep(step.hasValue)
{
ASSERT(isfinite(m_maximum));
ASSERT(isfinite(m_minimum));
ASSERT(isfinite(m_step));
ASSERT(isfinite(m_stepBase));
}
double StepRange::acceptableError() const
{
return m_step / pow(2.0, FLT_MANT_DIG);
}
double StepRange::alignValueForStep(double currentValue, unsigned currentDecimalPlaces, double newValue) const
{
if (newValue >= pow(10.0, 21.0))
return newValue;
if (stepMismatch(currentValue)) {
double scale = pow(10.0, static_cast<double>(max(m_stepDecimalPlaces, currentDecimalPlaces)));
newValue = round(newValue * scale) / scale;
} else {
double scale = pow(10.0, static_cast<double>(max(m_stepDecimalPlaces, m_stepBaseDecimalPlaces)));
newValue = round((m_stepBase + round((newValue - m_stepBase) / m_step) * m_step) * scale) / scale;
}
return newValue;
}
double StepRange::clampValue(double value) const
{
double clampedValue = max(m_minimum, min(value, m_maximum));
if (!m_hasStep)
return clampedValue;
// Rounds clampedValue to minimum + N * step.
clampedValue = m_minimum + round((clampedValue - m_minimum) / m_step) * m_step;
if (clampedValue > m_maximum)
clampedValue -= m_step;
ASSERT(clampedValue >= m_minimum);
ASSERT(clampedValue <= m_maximum);
return clampedValue;
}
StepRange::DoubleWithDecimalPlacesOrMissing StepRange::parseStep(AnyStepHandling anyStepHandling, const StepDescription& stepDescription, const String& stepString)
{
if (stepString.isEmpty())
return DoubleWithDecimalPlacesOrMissing(stepDescription.defaultValue());
if (equalIgnoringCase(stepString, "any")) {
switch (anyStepHandling) {
case RejectAny:
return DoubleWithDecimalPlacesOrMissing(DoubleWithDecimalPlaces(1), false);
case AnyIsDefaultStep:
return DoubleWithDecimalPlacesOrMissing(stepDescription.defaultValue());
default:
ASSERT_NOT_REACHED();
}
}
DoubleWithDecimalPlacesOrMissing step(0);
step.value.value = parseToDoubleForNumberTypeWithDecimalPlaces(stepString, &step.value.decimalPlaces);
if (!isfinite(step.value.value) || step.value.value <= 0.0)
return DoubleWithDecimalPlacesOrMissing(stepDescription.defaultValue());
switch (stepDescription.stepValueShouldBe) {
case StepValueShouldBeReal:
step.value.value *= stepDescription.stepScaleFactor;
break;
case ParsedStepValueShouldBeInteger:
// For date, month, and week, the parsed value should be an integer for some types.
step.value.value = max(round(step.value.value), 1.0);
step.value.value *= stepDescription.stepScaleFactor;
break;
case ScaledStepValueShouldBeInteger:
// For datetime, datetime-local, time, the result should be an integer.
step.value.value *= stepDescription.stepScaleFactor;
step.value.value = max(round(step.value.value), 1.0);
break;
default:
ASSERT_NOT_REACHED();
}
ASSERT(step.value.value > 0);
return step;
}
bool StepRange::stepMismatch(double doubleValue) const
{
if (!m_hasStep)
return false;
if (!isfinite(doubleValue))
return false;
doubleValue = fabs(doubleValue - m_stepBase);
if (isinf(doubleValue))
return false;
// double's fractional part size is DBL_MAN_DIG-bit. If the current value
// is greater than step*2^DBL_MANT_DIG, the following computation for
// remainder makes no sense.
if (doubleValue / pow(2.0, DBL_MANT_DIG) > m_step)
return false;
// The computation follows HTML5 4.10.7.2.10 `The step attribute' :
// ... that number subtracted from the step base is not an integral multiple
// of the allowed value step, the element is suffering from a step mismatch.
double remainder = fabs(doubleValue - m_step * round(doubleValue / m_step));
// Accepts erros in lower fractional part which IEEE 754 single-precision
// can't represent.
double computedAcceptableError = acceptableError();
return computedAcceptableError < remainder && remainder < (m_step - computedAcceptableError);
}
} // namespace WebCore
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