/*

 * 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 "HTMLInputElement.h"

#include "HTMLNames.h"

#include "LegacyHTMLTreeBuilder.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;

    // Rounds clampedValue to minimum + N * step.

    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 = parseToDoubleForNumberType(stringValue, &value);

    if (!parseSuccess)

        value = (minimum + maximum) / 2;

    return clampValue(value);

}

double StepRange::valueFromElement(HTMLInputElement* element, bool* wasClamped)

{

    double oldValue;

    bool parseSuccess = parseToDoubleForNumberType(element->value(), &oldValue);

    if (!parseSuccess)

        oldValue = (minimum + maximum) / 2;

    double newValue = clampValue(oldValue);

    if (wasClamped)

        *wasClamped = !parseSuccess || newValue != oldValue;

    return newValue;

}

}