qcompressedwhitespace_p.h

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//
//  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
{
    class Q_AUTOTEST_EXPORT CompressedWhitespace
    {
        public:
            static QString compress(const QStringRef &input);

            static QString decompress(const QString &input);

        private:
            enum CharIdentifier
            {
                Space   = 0x0,

                CR      = 0x80,

                LF      = 0x40,

                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,

                Lower8Bits = (1 << 8) - 1,

                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);

            static inline bool isEven(const int number);

            inline CompressedWhitespace();
            Q_DISABLE_COPY(CompressedWhitespace)
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif