/**
* Parses a chunk of statements -> + term { print('+') } rest | - term { print('-') } rest | empty
*
* @throws IOException
*/
public void rest() throws IOException {
while (true) {
if (lookahead == '+') {
match('+');
term();
writer.write('+');
continue;
} else if (lookahead == '-') {
match('-');
term();
writer.write('-');
continue;
}
break;
}
}
/**
* Parses a term -> 0 | .. | 9
*
* @throws IOException
*/
public void term() throws IOException, SyntaxError {
if (Character.isDigit((char) lookahead)) {
writer.write((char) lookahead);
match(lookahead);
}
}