--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xmlpatterns/data/qatomiccomparator_p.h Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,223 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@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 <frans.englich@nokia.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