private final boolean deletePreviousWord() throws IOException {
while (isDelimiter(buf.current()) && backspace()) {;
}
while (!isDelimiter(buf.current()) && backspace()) {;
}
return true;
}
private final boolean nextWord() throws IOException {
while (isDelimiter(buf.current()) && (moveCursor(1) != 0)) {;
}
while (!isDelimiter(buf.current()) && (moveCursor(1) != 0)) {;
}
return true;
}