#include "config.h"
#include "StepRange.h"
#include "HTMLInputElement.h"
#include "HTMLNames.h"
#include "PlatformString.h"
#include <wtf/MathExtras.h>
using namespace std;
namespace WebCore {
using namespace HTMLNames;
StepRange::StepRange(const HTMLInputElement* element)
{
if (element->hasAttribute(precisionAttr)) {
step = 1.0;
hasStep = !equalIgnoringCase(element->getAttribute(precisionAttr), "float");
} else
hasStep = element->getAllowedValueStep(&step);
maximum = element->maximum();
minimum = element->minimum();
}
double StepRange::clampValue(double value)
{
double clampedValue = max(minimum, min(value, maximum));
if (!hasStep)
return clampedValue;
clampedValue = minimum + round((clampedValue - minimum) / step) * step;
if (clampedValue > maximum)
clampedValue -= step;
ASSERT(clampedValue >= minimum);
ASSERT(clampedValue <= maximum);
return clampedValue;
}
double StepRange::clampValue(const String& stringValue)
{
double value;
bool parseSuccess = HTMLInputElement::parseToDoubleForNumberType(stringValue, &value);
if (!parseSuccess)
value = (minimum + maximum) / 2;
return clampValue(value);
}
double StepRange::valueFromElement(HTMLInputElement* element, bool* wasClamped)
{
double oldValue;
bool parseSuccess = HTMLInputElement::parseToDoubleForNumberType(element->value(), &oldValue);
if (!parseSuccess)
oldValue = (minimum + maximum) / 2;
double newValue = clampValue(oldValue);
if (wasClamped)
*wasClamped = !parseSuccess || newValue != oldValue;
return newValue;
}
}