tokenizer.h

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/*
    Copyright (C) 2000-2007 Paul Davis 

    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 2 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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#ifndef PBD_TOKENIZER
#define PBD_TOKENIZER

#include <iterator>
#include <string>

#include "pbd/libpbd_visibility.h"
#include "pbd/whitespace.h"

namespace PBD {

template<typename StringType, typename Iter>
/*LIBPBD_API*/ unsigned int
tokenize(const StringType& str,        
        const StringType& delims,
        Iter it,
                bool strip_whitespace=false)
{
    typename StringType::size_type start_pos = 0;
    typename StringType::size_type end_pos = 0;
    unsigned int token_count = 0;

    do {
        start_pos = str.find_first_not_of(delims, start_pos);
        end_pos = str.find_first_of(delims, start_pos);
        if (start_pos != end_pos) {
            if (end_pos == str.npos) {
                end_pos = str.length();
            }
                if (strip_whitespace) {
                                StringType stripped = str.substr(start_pos, end_pos - start_pos);
                                strip_whitespace_edges (stripped);
                                if (stripped.length()) {
                                        *it++ = stripped;
                                }
                        } else {
                *it++ = str.substr(start_pos, end_pos - start_pos);
                        }
            ++token_count;
            start_pos = str.find_first_not_of(delims, end_pos + 1);
        }
    } while (start_pos != str.npos);

    if (start_pos != str.npos) {
        if (strip_whitespace) {
                        StringType stripped = str.substr(start_pos, str.length() - start_pos);
                        strip_whitespace_edges (stripped);
                        if (stripped.length()) {
                                *it++ = stripped;
                        }
                } else {
                *it++ = str.substr(start_pos, str.length() - start_pos);
                }
        ++token_count;
    }

    return token_count;
}

} // namespace PBD

#endif // PBD_TOKENIZER