/** Consumes a token without returning the value. */
public void advance() {
if (nextToken != null) {
try {
nextToken = scanner.yylex();
} catch (IOException e) {
nextToken = null;
} catch (ScannerException e) {
nextToken = null;
}
}
}
/**
* Creates the scanner and reads the first lookahead token.
*
* @param istream the input stream to tokenize.
*/
public Scanner(DataInputStream istream) {
super();
scanner = new Lexer(istream);
try {
nextToken = scanner.yylex();
} catch (IOException e) {
nextToken = null;
} catch (ScannerException e) {
nextToken = null;
}
}