@Override
public char nextChar() {
if (start >= length) {
return reader.nextChar();
} else {
return lookahead[start++];
}
}
public void lookahead(int numberOfCharacters) {
numberOfCharacters += length - start;
if (lookahead.length < numberOfCharacters) {
lookahead = Arrays.copyOf(lookahead, numberOfCharacters);
}
if (start >= length) {
start = 0;
length = 0;
}
try {
numberOfCharacters -= length;
while (numberOfCharacters-- > 0) {
lookahead[length] = reader.nextChar();
length++;
}
} catch (EOFException ex) {
// ignore.
}
}