Long live Qt 4.5!

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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtXmlPatterns module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists purely as an
+// implementation detail.  This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+#ifndef Patternist_AtomicComparators_H
+#define Patternist_AtomicComparators_H
+
+#include "qabstractfloat_p.h"
+#include "qatomiccomparator_p.h"
+#include "qprimitives_p.h"
+
+/**
+ * @file
+ * @short Contains all the classes implementing comparisons between atomic values.
+ */
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short Performs case @em sensitive string comparison
+     * between @c xs:anyUri, @c xs:string, and @c xs:untypedAtomic.
+     *
+     * @ingroup Patternist_xdm
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class StringComparator : public AtomicComparator
+    {
+    public:
+        /**
+         * Compares two strings, and returns the appropriate AtomicComparator::ComparisonResult enum. This
+         * is a bit simplified version of string comparison as defined in the XPath specifications,
+         * since this does not take any string collations into account(which an implementation neither
+         * is required to do).
+         *
+         * @see <a href="http://www.w3.org/TR/xpath-functions/#string-compare">XQuery 1.0 and XPath
+         * 2.0 Functions and Operators, 7.3 ValueComparison::Equality and Comparison of Strings</a>
+         */
+        virtual ComparisonResult compare(const Item &op1,
+                                         const AtomicComparator::Operator op,
+                                         const Item &op2) const;
+
+        /**
+         * Compares two strings, and returns @c true if they are considered equal as per
+         * an ordinary string comparison. In other words, this is an implementation with
+         * the Unicode code point collation.
+         *
+         * @see <a href="http://www.w3.org/TR/xpath-functions/#string-compare">XQuery 1.0 and XPath
+         * 2.0 Functions and Operators, 7.3 ValueComparison::Equality and Comparison of Strings</a>
+         */
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const;
+    };
+
+    /**
+     * @short Performs case @em insensitive string comparison
+     * between @c xs:anyUri, @c xs:string, and @c xs:untypedAtomic.
+     *
+     * @ingroup Patternist_xdm
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class CaseInsensitiveStringComparator : public AtomicComparator
+    {
+    public:
+        /**
+         * Converts both string values to upper case and afterwards compare them.
+         */
+        virtual ComparisonResult compare(const Item &op1,
+                                         const AtomicComparator::Operator op,
+                                         const Item &op2) const;
+
+        /**
+         * Converts both string values case insensitively.
+         */
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const;
+    };
+
+    /**
+     * @short Compares @c xs:base64Binary and @c xs:hexBinary values.
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class BinaryDataComparator : public AtomicComparator
+    {
+    public:
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const;
+    };
+
+    /**
+     * @short Compares @c xs:boolean values.
+     *
+     * This is done via the object's Boolean::evaluteEBV() function.
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class BooleanComparator : public AtomicComparator
+    {
+    public:
+        virtual ComparisonResult compare(const Item &op1,
+                                         const AtomicComparator::Operator op,
+                                         const Item &op2) const;
+
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const;
+    };
+
+    /**
+     * @short Compares @c xs:double values.
+     *
+     * @todo Add docs about numeric promotion
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class AbstractFloatComparator : public AtomicComparator
+    {
+    public:
+        virtual ComparisonResult compare(const Item &op1,
+                                         const AtomicComparator::Operator op,
+                                         const Item &op2) const;
+
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const;
+    };
+
+    /**
+     * @short Compares @c xs:double values for the purpose of sorting.
+     *
+     * @todo Add docs about numeric promotion
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    template<const AtomicComparator::Operator t_op>
+    class AbstractFloatSortComparator : public AbstractFloatComparator
+    {
+    public:
+        virtual ComparisonResult compare(const Item &o1,
+                                         const AtomicComparator::Operator op,
+                                         const Item &o2) const
+        {
+            Q_ASSERT_X(t_op == OperatorLessThanNaNLeast || t_op == OperatorLessThanNaNGreatest, Q_FUNC_INFO,
+                       "Can only be instantiated with those two.");
+            Q_ASSERT(op == t_op);
+            Q_UNUSED(op); /* Needed when building in release mode. */
+
+            const xsDouble v1 = o1.template as<Numeric>()->toDouble();
+            const xsDouble v2 = o2.template as<Numeric>()->toDouble();
+
+            if(qIsNaN(v1) && !qIsNaN(v2))
+                return t_op == OperatorLessThanNaNLeast ? LessThan : GreaterThan;
+            if(!qIsNaN(v1) && qIsNaN(v2))
+                return t_op == OperatorLessThanNaNLeast ? GreaterThan : LessThan;
+
+            if(Double::isEqual(v1, v2))
+                return Equal;
+            else if(v1 < v2)
+                return LessThan;
+            else
+                return GreaterThan;
+        }
+
+    };
+
+    /**
+     * @short Compares @c xs:decimal values.
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class DecimalComparator : public AtomicComparator
+    {
+    public:
+        virtual ComparisonResult compare(const Item &op1,
+                                         const AtomicComparator::Operator op,
+                                         const Item &op2) const;
+
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const;
+    };
+
+    /**
+     * @short Compares @c xs:integer values.
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class IntegerComparator : public AtomicComparator
+    {
+    public:
+        virtual ComparisonResult compare(const Item &op1,
+                                         const AtomicComparator::Operator op,
+                                         const Item &op2) const;
+
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const;
+    };
+
+    /**
+     * @short Compares @c xs:QName values.
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class QNameComparator : public AtomicComparator
+    {
+    public:
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const;
+    };
+
+    /**
+     * @short Compares sub-classes of AbstractDateTime.
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class AbstractDateTimeComparator : public AtomicComparator
+    {
+    public:
+        virtual ComparisonResult compare(const Item &op1,
+                                         const AtomicComparator::Operator op,
+                                         const Item &op2) const;
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const;
+    };
+
+    /**
+     * @short Compares sub-classes of AbstractDuration.
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class AbstractDurationComparator : public AtomicComparator
+    {
+    public:
+        virtual ComparisonResult compare(const Item &op1,
+                                         const AtomicComparator::Operator op,
+                                         const Item &op2) const;
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const;
+
+    private:
+        static inline QDateTime addDurationToDateTime(const QDateTime &dateTime,
+                                                      const AbstractDuration *const duration);
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif