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_AtomicComparator_H
+#define Patternist_AtomicComparator_H
+
+#include <QFlags>
+
+#include "qitem_p.h"
+#include "qatomictypedispatch_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+class QString;
+
+namespace QPatternist
+{
+
+    /**
+     * @short Base class for classes responsible of comparing two atomic values.
+     *
+     * This class is also known as the AtomicParrot.
+     *
+     * @ingroup Patternist_xdm
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class Q_AUTOTEST_EXPORT AtomicComparator : public AtomicTypeVisitorResult
+    {
+    public:
+        AtomicComparator();
+        virtual ~AtomicComparator();
+
+        typedef QExplicitlySharedDataPointer<AtomicComparator> Ptr;
+
+        /**
+         * Identifies operators used in value comparisons.
+         *
+         * The enum values are bit-significant.
+         *
+         * @see <a href="http://www.w3.org/TR/xpath20/#id-value-comparisons">W3C XML Path
+         * Language (XPath) 2.0, 3.5.1 Value Comparisons</a>
+         */
+        enum Operator
+        {
+            /**
+             * Operator <tt>eq</tt> and <tt>=</tt>.
+             */
+            OperatorEqual           = 1,
+
+            /**
+             * Operator <tt>ne</tt> and <tt>!=</tt>.
+             */
+            OperatorNotEqual        = 1 << 1,
+
+            /**
+             * Operator <tt>gt</tt> and <tt>\></tt>.
+             */
+            OperatorGreaterThan     = 1 << 2,
+
+            /**
+             * Operator <tt>lt</tt> and <tt>\<</tt>.
+             */
+            OperatorLessThan        = 1 << 3,
+
+            /**
+             * One of the operators we use for sorting. The only difference from
+             * OperatorLessThan is that it sees NaN as ordered and smaller than
+             * other numbers.
+             */
+            OperatorLessThanNaNLeast    = 1 << 4,
+
+            /**
+             * One of the operators we use for sorting. The only difference from
+             * OperatorLessThanLeast is that it sees NaN as ordered and larger than
+             * other numbers.
+             */
+            OperatorLessThanNaNGreatest    = 1 << 5,
+
+            /**
+             * Operator <tt>ge</tt> and <tt>\>=</tt>.
+             */
+            OperatorGreaterOrEqual  = OperatorEqual | OperatorGreaterThan,
+
+            /**
+             * Operator <tt>le</tt> and <tt>\<=</tt>.
+             */
+            OperatorLessOrEqual     = OperatorEqual | OperatorLessThan
+        };
+
+        typedef QFlags<Operator> Operators;
+
+        /**
+         * Signifies the result of a value comparison. This is used for value comparisons,
+         * and in the future likely also for sorting.
+         *
+         * @see <a href="http://www.w3.org/TR/xpath20/#id-value-comparisons">W3C XML Path
+         * Language (XPath) 2.0, 3.5.1 Value Comparisons</a>
+         */
+        enum ComparisonResult
+        {
+            LessThan     = 1,
+            Equal        = 2,
+            GreaterThan  = 4,
+            Incomparable = 8
+        };
+
+        /**
+         * Compares @p op1 and @p op2 and determines the relationship between the two. This
+         * is used for sorting and comparisons. The implementation performs an assert crash,
+         * and must therefore be re-implemented if comparing the relevant values should be
+         * possible.
+         *
+         * @param op1 the first operand
+         * @param op the operator. How a comparison is carried out shouldn't depend on what the
+         * operator is, but in some cases it is of interest.
+         * @param op2 the second operand
+         */
+        virtual ComparisonResult compare(const Item &op1,
+                                         const AtomicComparator::Operator op,
+                                         const Item &op2) const;
+
+        /**
+         * Determines whether @p op1 and @p op2 are equal. It is the same as calling compare()
+         * and checking whether the return value is Equal, but since comparison testing is such
+         * a common operation, this specialized function exists.
+         *
+         * @returns true if @p op1 and @p op2 are equal.
+         *
+         * @param op1 the first operand
+         * @param op2 the second operand
+         */
+        virtual bool equals(const Item &op1,
+                            const Item &op2) const = 0;
+
+        /**
+         * Identifies the kind of comparison.
+         */
+        enum ComparisonType
+        {
+            /**
+             * Identifies a general comparison; operator @c =, @c >, @c <=, and so on.
+             */
+            AsGeneralComparison = 1,
+
+            /**
+             * Identifies a value comparison; operator @c eq, @c lt, @c le, and so on.
+             */
+            AsValueComparison
+        };
+
+        /**
+         * Utility function for getting the lexical representation for
+         * the comparison operator @p op. Depending on the @p type argument,
+         * the string returned is either a general comparison or a value comparison
+         * operator.
+         *
+         * @param op the operator which the display name should be determined for.
+         * @param type signifies whether the returned display name should be for
+         * a value comparison or a general comparison. For example, if @p op is
+         * OperatorEqual and @p type is AsValueComparision, "eq" is returned.
+         */
+        static QString displayName(const AtomicComparator::Operator op,
+                                   const ComparisonType type);
+
+    };
+    Q_DECLARE_OPERATORS_FOR_FLAGS(AtomicComparator::Operators)
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif