common/nstring/accumulator.h

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//
//      aegis - project change supervisor
//      Copyright (C) 2004-2006, 2008 Peter Miller
//
//      This program is free software; you can redistribute it and/or modify
//      it under the terms of the GNU General Public License as published by
//      the Free Software Foundation; either version 3 of the License, or
//      (at your option) any later version.
//
//      This program is distributed in the hope that it will be useful,
//      but WITHOUT ANY WARRANTY; without even the implied warranty of
//      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//      GNU General Public License for more details.
//
//      You should have received a copy of the GNU General Public License
//      along with this program. If not, see
//      <http://www.gnu.org/licenses/>.
//

#ifndef COMMON_NSTRING_ACCUMULATOR_H
#define COMMON_NSTRING_ACCUMULATOR_H

#include <common/nstring.h>

class nstring_accumulator
{
public:
    ~nstring_accumulator();

    nstring_accumulator();

    nstring_accumulator(const nstring_accumulator &);

    nstring_accumulator &operator=(const nstring_accumulator &);

    nstring mkstr() const;

    void
    push_back(char c)
    {
        //
        // The nstring_accumulator::push_back(char) method shows up
        // in the profiles as occupying 10% of the time it takes to
        // parse the database files.  By making it an inline, things go
        // measurably faster.
        //
        if (length < maximum)
            buffer[length++] = c;
        else
            overflow(c);
    }

    void push_back(const char *data, size_t len);

    void push_back(const char *data);

    void push_back(const nstring_accumulator &data);

    void push_back(const nstring &data);

    void clear() { length = 0; }

    size_t size() const { return length; }

    bool empty() const { return (length == 0); }

    void pop_back() { if (length) --length; }

    char back() { return (length ? buffer[length - 1] : 0); }

    const char *get_data() const { return (buffer ? buffer : ""); }

    char operator[](size_t n) { return buffer[n]; }

private:
    void overflow(char c);

    size_t length;

    size_t maximum;

    char *buffer;
};


#endif // COMMON_NSTRING_ACCUMULATOR_H