MNRopeSubstring.h

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/*
 * Copyright (c) 1997
 * Silicon Graphics Computer Systems, Inc.
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Silicon Graphics makes no
 * representations about the suitability of this software for any
 * purpose.  It is provided "as is" without express or implied warranty.
 *
 * Heavily modified by KOM/Darmstadt University of Technology, 2000
 */
#ifndef _R_SUBSTRING_H
#define _R_SUBSTRING_H

#include <sys/types.h>

#include "MNRopeCharProducer.h"
#include "MNRopeFunction.h"

class MNRopeRep;

// Substring results are usually represented using just
// concatenation nodes.  But in the case of very long flat ropes
// or ropes with a functional representation that isn't practical.
// In that case, we represent the __result as a special case of
// RopeFunction, whose char_producer points back to the rope itself.
// In all cases except repeated substring operations and
// deallocation, we treat the __result as a RopeFunction.

struct MNRopeSubstring
    : public MNRopeFunction
    , public MNRopeCharProducer
{
public:
    // XXX this whole class should be rewritten.
    MNRopeRep* _M_base;      // not 0
    size_t    _M_start;

    virtual void operator()( size_t __start_pos,
                             size_t __req_len,
                             uchar_t* __buffer);

    MNRopeSubstring( MNRopeRep* __b,
                         size_t    __s,
                         size_t    __l );

    virtual ~MNRopeSubstring();
};


#endif /* _R_SUBSTRING_H */

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