tokenizer.h

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/*
 * Copyright (C) 2006-2007 Taybin Rutkin <taybin@taybin.com>
 * Copyright (C) 2007-2015 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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