Move StringTokenizer to its own files (tokenizer.h/tokenizer.cpp).

svn-id: r48310

common/tokenizer.cpp

@@ -0,0 +1,59 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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.
+ *
+ * $URL$
+ * $Id$
+ */
+
+#include "common/tokenizer.h"
+
+namespace Common {
+
+StringTokenizer::StringTokenizer(const String &str, const String &delimiters) : _str(str), _delimiters(delimiters) {
+	reset();
+}
+
+void StringTokenizer::reset() {
+	_tokenBegin = _tokenEnd = 0;
+}
+
+bool StringTokenizer::empty() const {
+	// Search for the next token's start (i.e. the next non-delimiter character)
+	for (uint i = _tokenEnd; i < _str.size(); i++) {
+		if (!_delimiters.contains(_str[i]))
+			return false; // Found a token so the tokenizer is not empty
+	}
+	// Didn't find any more tokens so the tokenizer is empty
+	return true;
+}
+
+String StringTokenizer::nextToken() {
+	// Seek to next token's start (i.e. jump over the delimiters before next token)
+	for (_tokenBegin = _tokenEnd; _tokenBegin < _str.size() && _delimiters.contains(_str[_tokenBegin]); _tokenBegin++)
+		;
+	// Seek to the token's end (i.e. jump over the non-delimiters)
+	for (_tokenEnd = _tokenBegin; _tokenEnd < _str.size() && !_delimiters.contains(_str[_tokenEnd]); _tokenEnd++)
+		;
+	// Return the found token
+	return String(_str.c_str() + _tokenBegin, _tokenEnd - _tokenBegin);
+}
+
+} // End of namespace Common
+