Added a simple non-optimized StringTokenizer-class for tokenizing strings. Also added a contains(char)-function to the String-class because it was handy in implementing the StringTokenizer.

svn-id: r30828

common/util.cpp

@@ -96,6 +96,33 @@ bool matchString(const char *str, const char *pat) {
 	}
 }
 
+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);
+}
+
 //
 // Print hexdump of the data passed in
 //