Initial import of statemachine branch from the old kinetic repository

1 files changed, 186 insertions, 0 deletions

diff --git a/src/xmlpatterns/acceltree/qcompressedwhitespace_p.h b/src/xmlpatterns/acceltree/qcompressedwhitespace_p.h
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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_CompressedWhitespace_H
+#define Patternist_CompressedWhitespace_H
+
+#include <QtGlobal>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+class QChar;
+class QString;
+class QStringRef;
+
+namespace QPatternist
+{
+    /**
+     * @short A compression facility for whitespace nodes.
+     *
+     * CompressedWhitespace compresses and decompresses strings that consists of
+     * whitespace only, and do so with a scheme that is designed to do this
+     * specialized task in an efficient way. The approach is simple: each
+     * sequence of equal whitespace in the input gets coded into one byte,
+     * where the first two bits signals the type, CharIdentifier, and the
+     * remininding six bits is the count.
+     *
+     * For instance, this scheme manages to compress a sequence of spaces
+     * followed by a new line into 16 bits(one QChar), and QString stores
+     * strings of one QChar quite efficiently, by avoiding a heap allocation.
+     *
+     * There is no way to tell whether a QString is compressed or not.
+     *
+     * The compression scheme originates from Saxon, by Michael Kay.
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class CompressedWhitespace
+    {
+        public:
+            /**
+             * @short Compresses @p input into a compressed format, returned
+             * as a QString.
+             *
+             * The caller guarantees that input is not empty
+             * and consists only of whitespace.
+             *
+             * The returned format is opaque. There is no way to find out
+             * whether a QString contains compressed data or not.
+             *
+             * @see decompress()
+             */
+            static QString compress(const QStringRef &input);
+
+            /**
+             * @short Decompresses @p input into a usual QString.
+             *
+             * @p input must be a QString as per returned from compress().
+             *
+             * @see compress()
+             */
+            static QString decompress(const QString &input);
+
+        private:
+            /**
+             * We use the two upper bits for communicating what space it is.
+             */
+            enum CharIdentifier
+            {
+                Space   = 0x0,
+
+                /**
+                 * 0xA, \\r
+                 *
+                 * Binary: 10000000
+                 */
+                CR      = 0x80,
+
+                /**
+                 * 0xD, \\n
+                 *
+                 * Binary: 01000000
+                 */
+                LF      = 0x40,
+
+                /**
+                 * Binary: 11000000
+                 */
+                Tab     = 0xC0
+            };
+
+            enum Constants
+            {
+                /* We can at maximum store this many consecutive characters
+                 * of one type. We use 6 bits for the count. */
+                MaxCharCount = (1 << 6) - 1,
+
+                /**
+                 * Binary: 11111111
+                 */
+                Lower8Bits = (1 << 8) - 1,
+
+                /**
+                 * Binary: 111111
+                 */
+                Lower6Bits = (1 << 6) - 1,
+
+                /*
+                 * Binary: 11000000
+                 */
+                UpperTwoBits = 3 << 6
+            };
+
+            static inline CharIdentifier toIdentifier(const QChar ch);
+
+            static inline quint8 toCompressedChar(const QChar ch, const int len);
+            static inline QChar toChar(const CharIdentifier id);
+
+            /**
+             * @short Returns @c true if @p number is an even number, otherwise
+             * @c false.
+             */
+            static inline bool isEven(const int number);
+
+            /**
+             * @short This class can only be used via its static members.
+             */
+            inline CompressedWhitespace();
+            Q_DISABLE_COPY(CompressedWhitespace)
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif