/**
* Checks a prospective crontab specification to see if it could benefit from balanced hashes.
*
* @param spec a (legal) spec
* @return a similar spec that uses a hash, if such a transformation is necessary; null if it is
* OK as is
* @since 1.510
*/
public static @CheckForNull String hashify(String spec) {
if (spec.contains("H")) {
// if someone is already using H, presumably he knows what it is, so a warning is likely false
// positive
return null;
} else if (spec.startsWith("*/")) { // "*/15 ...." (every N minutes) to hash
return "H" + spec.substring(1);
} else if (spec.matches("\\d+ .+")) { // "0 ..." (certain minute) to hash
return "H " + spec.substring(spec.indexOf(' ') + 1);
} else {
Matcher m = Pattern.compile("0(,(\\d+)(,\\d+)*)( .+)").matcher(spec);
if (m.matches()) { // 0,15,30,45 to H/15
int period = Integer.parseInt(m.group(2));
if (period > 0) {
StringBuilder b = new StringBuilder();
for (int i = period; i < 60; i += period) {
b.append(',').append(i);
}
if (b.toString().equals(m.group(1))) {
return "H/" + period + m.group(4);
}
}
}
return null;
}
}
String handle(String question) {
Matcher additionMatcher = compile("what is (\\d+) plus (\\d+)").matcher(question);
if (additionMatcher.matches()) {
return String.valueOf(valueOf(additionMatcher.group(1)) + valueOf(additionMatcher.group(2)));
}
Matcher maximumMatcher =
compile("which of the following numbers is the largest: (.+)").matcher(question);
if (maximumMatcher.matches()) {
Integer max = 0;
for (String number : maximumMatcher.group(1).split(", ")) {
max = max(max, valueOf(number));
}
return max.toString();
}
Matcher productMatcher =
compile(
"what is the product of \\[(\\d+), (\\d+), (\\d+), (\\d+), (\\d+), (\\d+), (\\d+), (\\d+), (\\d+), (\\d+)\\]")
.matcher(question);
if (productMatcher.matches()) {
BigDecimal product = new BigDecimal(1);
for (int i = 1; i <= 10; i++) {
BigDecimal b = new BigDecimal(productMatcher.group(i));
product = product.multiply(b);
}
return product.toString();
}
Matcher shaMatcher = compile("what is the sha1 for \"([\\w_]+)\"").matcher(question);
if (shaMatcher.matches()) {
try {
byte[] digest = MessageDigest.getInstance("SHA-1").digest(shaMatcher.group(1).getBytes());
StringBuilder sb = new StringBuilder();
for (byte aByteDigest : digest) {
String hex = Integer.toHexString(0xFF & aByteDigest);
if (hex.length() == 1) {
sb.append('0');
}
sb.append(hex);
}
return sb.toString();
} catch (NoSuchAlgorithmException e) {
err.println(e.getMessage());
}
}
Matcher piMatcher =
compile("what is the (\\d+)(?:st|nd|rd|th) decimal of Pi").matcher(question);
if (piMatcher.matches()) {
Integer nthDecimal = valueOf(piMatcher.group(1));
return "141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117"
.substring(nthDecimal - 1, nthDecimal);
}
Matcher feetToMeterMatcher = compile("how much is (\\d+) feet in meters").matcher(question);
if (feetToMeterMatcher.matches()) {
return String.valueOf(valueOf(feetToMeterMatcher.group(1)) * 0.3048);
}
Matcher hexaAddition =
compile("what is the decimal value of 0x([\\da-f]+) plus 0x([\\da-f]+)").matcher(question);
if (hexaAddition.matches()) {
return String.valueOf(
parseInt(hexaAddition.group(1), 16) + parseInt(hexaAddition.group(2), 16));
}
if ("what is the answer to life, the universe and everything".equals(question)) {
return "42";
}
if ("in which language was the first 'hello, world' written".equals(question)) {
return "c";
}
if ("what does 'RTFM' stand for".equals(question)) {
return "Read The F*****g Manual";
}
if ("who counted to infinity twice".equals(question)) {
return "Chuck Norris";
}
if ("who said 'Luke, I am your father'".equals(question)) {
return "Darth Vader";
}
Matcher dayOfWeekMatcher =
compile("which day of the week is \\s?([\\d]+) (\\w{3}) (\\d+)").matcher(question);
if (dayOfWeekMatcher.matches()) {
Calendar parsedDate = new GregorianCalendar();
parsedDate.set(DATE, valueOf(dayOfWeekMatcher.group(1)));
Integer month = null;
switch (dayOfWeekMatcher.group(2)) {
case "Jan":
month = JANUARY;
break;
case "Feb":
month = FEBRUARY;
break;
case "Mar":
month = MARCH;
break;
case "Apr":
month = APRIL;
break;
case "May":
month = MAY;
break;
case "Jun":
month = JUNE;
break;
case "Jul":
month = JULY;
break;
case "Aug":
month = AUGUST;
break;
case "Sep":
month = SEPTEMBER;
break;
case "Oct":
month = OCTOBER;
break;
case "Nov":
month = NOVEMBER;
break;
case "Dec":
month = DECEMBER;
break;
}
if (month != null) {
parsedDate.set(MONTH, month);
}
parsedDate.set(YEAR, valueOf(dayOfWeekMatcher.group(3)));
return parsedDate.getDisplayName(DAY_OF_WEEK, LONG, US);
}
Matcher httpResponseMatcher =
compile(
"what HTTP response status do you get when you send a GET request to "
+ "(?:(http://(?:\\d{1,3}\\.){3}\\d{1,3}(?:\\:\\d+)?/http_code/[0-9a-z]{8})|a teapot)")
.matcher(question);
if (httpResponseMatcher.matches()) {
if ("a teapot".equals(httpResponseMatcher.group(1))) {
return "418";
}
URLConnection urlConnection = null;
try {
urlConnection = new URL(httpResponseMatcher.group(1)).openConnection();
return String.valueOf(((HttpURLConnection) urlConnection).getResponseCode());
} catch (IOException e) {
e.printStackTrace();
} finally {
if (urlConnection != null) {
((HttpURLConnection) urlConnection).disconnect();
}
}
}
return "";
}