Implementation of CSS3 nav-up/down/left/right properties from CSS3 UI.

Source/core/rendering/style/StyleNavigationValue.h

+/*
+ * Copyright (C) 2011 Kyounga Ra (kyounga.ra@gmail.com)
+ *
+ * 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.
+ *
+ */
+
+#ifndef StyleNavigationValue_h
+#define StyleNavigationValue_h
+
+namespace WebCore {
+
+class StyleNavigationValue {
+friend class RenderStyle;
+public:
+    StyleNavigationValue()
+    :m_id(AtomicString("auto"))

[esprehn, 2013/06/20 19:45:10]

Missing space

[Krzysztof Olczyk, 2013/07/22 14:14:16]

Done.

+    , m_target(AtomicString("current")) { }

[esprehn, 2013/06/20 19:45:10]

You don't need the AtomicString here, just call the constructor with
m_target("current")

[Krzysztof Olczyk, 2013/07/22 14:14:16]

Done.

+
+    StyleNavigationValue(const char* id, const char* target)

[esprehn, 2013/06/20 19:45:10]

String? We don't really use const char* like this.

[Krzysztof Olczyk, 2013/07/22 14:14:16]

Done.

+    :m_id(AtomicString(id))

[esprehn, 2013/06/20 19:45:10]

Same

[Krzysztof Olczyk, 2013/07/22 14:14:16]

Done.

+    , m_target(AtomicString(target)) { }
+
+    StyleNavigationValue(const AtomicString& id, const AtomicString& target = AtomicString("current"))
+    :m_id(id)
+    , m_target(target)
+    { }
+
+    bool isAuto() const
+    {
+        return m_id == "auto";
+    }
+
+    bool operator==(const StyleNavigationValue& o) const
+    {
+        return m_id == o.m_id && m_target == o.m_target;
+    }
+
+    bool operator!=(const StyleNavigationValue& o) const
+    {
+        return !(*this == o);
+    }
+
+    void operator=(const StyleNavigationValue& o)
+    {
+        m_id = o.m_id;
+        m_target = o.m_target;
+    }
+
+    const AtomicString& id() const { return m_id; }
+    const AtomicString& target() const { return m_target; }
+
+protected:
+    AtomicString m_id;
+    AtomicString m_target;
+};
+
+} // namespace WebCore
+
+#endif // StyleNavigationValue_h