--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebCore/html/StepRange.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,85 @@
+/*
+ * 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;
+}
+
+}