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tokenizer.cpp

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00001 /* ScummVM - Graphic Adventure Engine
00002  *
00003  * ScummVM is the legal property of its developers, whose names
00004  * are too numerous to list here. Please refer to the COPYRIGHT
00005  * file distributed with this source distribution.
00006  *
00007  * This program is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU General Public License
00009  * as published by the Free Software Foundation; either version 2
00010  * of the License, or (at your option) any later version.
00011  *
00012  * This program is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00015  * GNU General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU General Public License
00018  * along with this program; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
00020  *
00021  */
00022 
00023 #include "common/tokenizer.h"
00024 
00025 namespace Common {
00026 
00027 StringTokenizer::StringTokenizer(const String &str, const String &delimiters) : _str(str), _delimiters(delimiters) {
00028     reset();
00029 }
00030 
00031 void StringTokenizer::reset() {
00032     _tokenBegin = _tokenEnd = 0;
00033 }
00034 
00035 bool StringTokenizer::empty() const {
00036     // Search for the next token's start (i.e. the next non-delimiter character)
00037     for (uint i = _tokenEnd; i < _str.size(); i++) {
00038         if (!_delimiters.contains(_str[i]))
00039             return false; // Found a token so the tokenizer is not empty
00040     }
00041     // Didn't find any more tokens so the tokenizer is empty
00042     return true;
00043 }
00044 
00045 String StringTokenizer::nextToken() {
00046     // Seek to next token's start (i.e. jump over the delimiters before next token)
00047     for (_tokenBegin = _tokenEnd; _tokenBegin < _str.size() && _delimiters.contains(_str[_tokenBegin]); _tokenBegin++)
00048         ;
00049     // Seek to the token's end (i.e. jump over the non-delimiters)
00050     for (_tokenEnd = _tokenBegin; _tokenEnd < _str.size() && !_delimiters.contains(_str[_tokenEnd]); _tokenEnd++)
00051         ;
00052     // Return the found token
00053     return String(_str.c_str() + _tokenBegin, _tokenEnd - _tokenBegin);
00054 }
00055 
00056 } // End of namespace Common


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