public boolean readDigitAndAdvance(RefInt i, int scale, int maxdigit) {
if (!isValid()) return false;
char c = source.charAt(index);
if (c < '0' || c > '9') return false;
int val = (int) c - (int) '0';
if (val > maxdigit) return false;
i.value += (val * scale);
advance();
return true;
}
public boolean parseDateTime(String s, int part) {
ParseContext context = new ParseContext(s);
boolean bDatePart = (part & DateTimePart_Date) != 0;
boolean bTimePart = (part & DateTimePart_Time) != 0;
RefInt year = new RefInt(0);
RefInt month = new RefInt(0);
RefInt day = new RefInt(0);
RefInt hour = new RefInt(0);
RefInt minute = new RefInt(0);
double second = 0;
hasTZ = TZ_MISSING;
offsetTZ = 0;
if (bDatePart) {
// parse date
boolean bNegative = context.checkAndAdvance('-');
if ((part & DateTimePart_Year) != 0) {
int digits = 0;
RefInt temp = new RefInt(0);
;
while (context.readDigitAndAdvance(temp, 1, 9)) {
year.value = year.value * 10 + temp.value;
digits += 1;
temp.value = 0;
if (digits >= 8) // overflow
return false;
}
if (digits < 4) // inalid
return false;
if (digits > 4 && year.value < 10000) return false;
if (bNegative) year.value = -year.value;
}
if ((part & (DateTimePart_Month | DateTimePart_Day)) != 0) {
if (!context.checkAndAdvance('-')) return false;
if ((part & DateTimePart_Month) != 0) {
if (!context.readDigitAndAdvance(month, 10, 1)) return false;
if (!context.readDigitAndAdvance(month, 1, month.value < 10 ? 9 : 2)) return false;
if (month.value == 0) return false;
}
if ((part & DateTimePart_Day) != 0) {
if (!context.checkAndAdvance('-')) return false;
int maxFirstDigit = month.value != 2 ? 3 : 2;
// complicate things by making them complicated.
if (!context.readDigitAndAdvance(day, 10, maxFirstDigit)) return false;
if (!context.readDigitAndAdvance(day, 1, 9)) return false;
if (day.value == 0 || day.value > 31) return false;
if ((part & DateTimePart_Month) != 0) {
boolean b1 = month.value <= 7;
boolean b2 = (month.value & 1) == 0;
// month 1, 3, 5, 7, 8, 10, 12
if (b1 == b2 && day.value > 30) return false;
// february.
if (month.value == 2 && day.value > 29) return false;
// leap years.
if (month.value == 2
&& (part & DateTimePart_Year) != 0
&& (year.value % 4 != 0 || year.value % 100 == 0)
&& year.value % 400 != 0
&& day.value > 28) return false;
}
}
}
if (bTimePart) {
// a 'T' must follow
if (!context.checkAndAdvance('T')) return false;
}
}
if (bTimePart) {
// check format here
// hour from 0 to 2
if (!context.readDigitAndAdvance(hour, 10, 2)) return false;
if (!context.readDigitAndAdvance(hour, 1, hour.value < 20 ? 9 : 4)) return false;
if (!context.checkAndAdvance(':')) return false;
int maxFirstDigit = hour.value == 24 ? 0 : 5;
int maxSecondDigit = hour.value == 24 ? 0 : 9;
if (!context.readDigitAndAdvance(minute, 10, maxFirstDigit)) return false;
if (!context.readDigitAndAdvance(minute, 1, maxSecondDigit)) return false;
if (!context.checkAndAdvance(':')) return false;
RefInt secondInt = new RefInt(0);
if (!context.readDigitAndAdvance(secondInt, 10, maxFirstDigit)) return false;
if (!context.readDigitAndAdvance(secondInt, 1, maxSecondDigit)) return false;
second = secondInt.value;
if (context.checkAndAdvance('.')) {
// fraction. do whatever seems fit.
RefInt val = new RefInt(0);
int digits = 0;
while (context.readDigitAndAdvance(val, 1, 9)) {
val.value *= 10;
digits += 1;
if (digits >= 8) // precision loss - ignore
break;
}
if (digits == 0) return false;
second += val.value * Math.pow(10.0, -digits - 1);
// skip any further digits.
while (context.readDigitAndAdvance(val, 0, 9)) ;
}
}
// timezone
if (context.checkAndAdvance('Z')) {
// timezone specified, it is UTC.
hasTZ = TZ_UTC;
offsetTZ = 0;
} else if (context.check('+') || context.check('-')) {
// timezone offset, in hour:minute format
boolean bNegative = context.check('-');
context.advance();
// do not check the hour part, for those who are obscure.
RefInt temp = new RefInt(0);
if (!context.readDigitAndAdvance(temp, 600, 9)) return false;
if (!context.readDigitAndAdvance(temp, 60, 9)) return false;
if (!context.checkAndAdvance(':')) return false;
if (!context.readDigitAndAdvance(temp, 10, 5)) return false;
if (!context.readDigitAndAdvance(temp, 1, 9)) return false;
hasTZ = TZ_OFFSET;
offsetTZ = bNegative ? -temp.value : temp.value;
}
if (context.isValid()) return false;
if (year.value <= 0) year.value = 1;
if (month.value == 0) month.value = 1;
if (day.value == 0) day.value = 1;
// if hour is 24 add a day.
if (hour.value == 24) {
hour.value = 0;
Calendar c = Calendar.getInstance();
c.set(year.value, month.value - 1, day.value);
c.add(Calendar.DATE, 1);
year.value = c.get(Calendar.YEAR);
month.value = c.get(Calendar.MONTH) + 1;
day.value = c.get(Calendar.DAY_OF_MONTH);
}
setInternalValues(
year.value,
month.value,
day.value,
hour.value,
minute.value,
(int) second,
((second * 1000) % 1000) / 1000,
hasTZ,
offsetTZ);
return true;
}
