| // © 2018 and later: Unicode, Inc. and others. |
| // License & terms of use: http://www.unicode.org/copyright.html |
| |
| #include <utility> |
| |
| #include "unicode/utypes.h" |
| |
| #if !UCONFIG_NO_FORMATTING |
| |
| #include <stdlib.h> |
| #include "unicode/ucal.h" |
| #include "unicode/ures.h" |
| #include "unicode/ustring.h" |
| #include "unicode/timezone.h" |
| #include "cmemory.h" |
| #include "cstring.h" |
| #include "erarules.h" |
| #include "gregoimp.h" |
| #include "uassert.h" |
| |
| U_NAMESPACE_BEGIN |
| |
| static const int32_t MAX_ENCODED_START_YEAR = 32767; |
| static const int32_t MIN_ENCODED_START_YEAR = -32768; |
| static const int32_t MIN_ENCODED_START = -2147483391; // encodeDate(MIN_ENCODED_START_YEAR, 1, 1, ...); |
| |
| static const int32_t YEAR_MASK = 0xFFFF0000; |
| static const int32_t MONTH_MASK = 0x0000FF00; |
| static const int32_t DAY_MASK = 0x000000FF; |
| |
| static const int32_t MAX_INT32 = 0x7FFFFFFF; |
| static const int32_t MIN_INT32 = 0xFFFFFFFF; |
| |
| static const UChar VAL_FALSE[] = {0x66, 0x61, 0x6c, 0x73, 0x65}; // "false" |
| static const UChar VAL_FALSE_LEN = 5; |
| |
| static UBool isSet(int startDate) { |
| return startDate != 0; |
| } |
| |
| static UBool isValidRuleStartDate(int32_t year, int32_t month, int32_t day) { |
| return year >= MIN_ENCODED_START_YEAR && year <= MAX_ENCODED_START_YEAR |
| && month >= 1 && month <= 12 && day >=1 && day <= 31; |
| } |
| |
| /** |
| * Encode year/month/date to a single integer. |
| * year is high 16 bits (-32768 to 32767), month is |
| * next 8 bits and day of month is last 8 bits. |
| * |
| * @param year year |
| * @param month month (1-base) |
| * @param day day of month |
| * @return an encoded date. |
| */ |
| static int32_t encodeDate(int32_t year, int32_t month, int32_t day) { |
| return year << 16 | month << 8 | day; |
| } |
| |
| static void decodeDate(int32_t encodedDate, int32_t (&fields)[3]) { |
| if (encodedDate == MIN_ENCODED_START) { |
| fields[0] = MIN_INT32; |
| fields[1] = 1; |
| fields[2] = 1; |
| } else { |
| fields[0] = (encodedDate & YEAR_MASK) >> 16; |
| fields[1] = (encodedDate & MONTH_MASK) >> 8; |
| fields[2] = encodedDate & DAY_MASK; |
| } |
| } |
| |
| /** |
| * Compare an encoded date with another date specified by year/month/day. |
| * @param encoded An encoded date |
| * @param year Year of another date |
| * @param month Month of another date |
| * @param day Day of another date |
| * @return -1 when encoded date is earlier, 0 when two dates are same, |
| * and 1 when encoded date is later. |
| */ |
| static int32_t compareEncodedDateWithYMD(int encoded, int year, int month, int day) { |
| if (year < MIN_ENCODED_START_YEAR) { |
| if (encoded == MIN_ENCODED_START) { |
| if (year > MIN_INT32 || month > 1 || day > 1) { |
| return -1; |
| } |
| return 0; |
| } else { |
| return 1; |
| } |
| } else if (year > MAX_ENCODED_START_YEAR) { |
| return -1; |
| } else { |
| int tmp = encodeDate(year, month, day); |
| if (encoded < tmp) { |
| return -1; |
| } else if (encoded == tmp) { |
| return 0; |
| } else { |
| return 1; |
| } |
| } |
| } |
| |
| EraRules::EraRules(LocalMemory<int32_t>& eraStartDates, int32_t numEras) |
| : numEras(numEras) { |
| startDates = std::move(eraStartDates); |
| initCurrentEra(); |
| } |
| |
| EraRules::~EraRules() { |
| } |
| |
| EraRules* EraRules::createInstance(const char *calType, UBool includeTentativeEra, UErrorCode& status) { |
| if(U_FAILURE(status)) { |
| return nullptr; |
| } |
| LocalUResourceBundlePointer rb(ures_openDirect(nullptr, "supplementalData", &status)); |
| ures_getByKey(rb.getAlias(), "calendarData", rb.getAlias(), &status); |
| ures_getByKey(rb.getAlias(), calType, rb.getAlias(), &status); |
| ures_getByKey(rb.getAlias(), "eras", rb.getAlias(), &status); |
| |
| if (U_FAILURE(status)) { |
| return nullptr; |
| } |
| |
| int32_t numEras = ures_getSize(rb.getAlias()); |
| int32_t firstTentativeIdx = MAX_INT32; |
| |
| LocalMemory<int32_t> startDates(static_cast<int32_t *>(uprv_malloc(numEras * sizeof(int32_t)))); |
| if (startDates.isNull()) { |
| status = U_MEMORY_ALLOCATION_ERROR; |
| return nullptr; |
| } |
| uprv_memset(startDates.getAlias(), 0 , numEras * sizeof(int32_t)); |
| |
| while (ures_hasNext(rb.getAlias())) { |
| LocalUResourceBundlePointer eraRuleRes(ures_getNextResource(rb.getAlias(), nullptr, &status)); |
| if (U_FAILURE(status)) { |
| return nullptr; |
| } |
| const char *eraIdxStr = ures_getKey(eraRuleRes.getAlias()); |
| char *endp; |
| int32_t eraIdx = (int32_t)strtol(eraIdxStr, &endp, 10); |
| if ((size_t)(endp - eraIdxStr) != uprv_strlen(eraIdxStr)) { |
| status = U_INVALID_FORMAT_ERROR; |
| return nullptr; |
| } |
| if (eraIdx < 0 || eraIdx >= numEras) { |
| status = U_INVALID_FORMAT_ERROR; |
| return nullptr; |
| } |
| if (isSet(startDates[eraIdx])) { |
| // start date of the index was already set |
| status = U_INVALID_FORMAT_ERROR; |
| return nullptr; |
| } |
| |
| UBool hasName = TRUE; |
| UBool hasEnd = TRUE; |
| int32_t len; |
| while (ures_hasNext(eraRuleRes.getAlias())) { |
| LocalUResourceBundlePointer res(ures_getNextResource(eraRuleRes.getAlias(), nullptr, &status)); |
| if (U_FAILURE(status)) { |
| return nullptr; |
| } |
| const char *key = ures_getKey(res.getAlias()); |
| if (uprv_strcmp(key, "start") == 0) { |
| const int32_t *fields = ures_getIntVector(res.getAlias(), &len, &status); |
| if (U_FAILURE(status)) { |
| return nullptr; |
| } |
| if (len != 3 || !isValidRuleStartDate(fields[0], fields[1], fields[2])) { |
| status = U_INVALID_FORMAT_ERROR; |
| return nullptr; |
| } |
| startDates[eraIdx] = encodeDate(fields[0], fields[1], fields[2]); |
| } else if (uprv_strcmp(key, "named") == 0) { |
| const UChar *val = ures_getString(res.getAlias(), &len, &status); |
| if (u_strncmp(val, VAL_FALSE, VAL_FALSE_LEN) == 0) { |
| hasName = FALSE; |
| } |
| } else if (uprv_strcmp(key, "end") == 0) { |
| hasEnd = TRUE; |
| } |
| } |
| |
| if (isSet(startDates[eraIdx])) { |
| if (hasEnd) { |
| // This implementation assumes either start or end is available, not both. |
| // For now, just ignore the end rule. |
| } |
| } else { |
| if (hasEnd) { |
| if (eraIdx != 0) { |
| // This implementation does not support end only rule for eras other than |
| // the first one. |
| status = U_INVALID_FORMAT_ERROR; |
| return nullptr; |
| } |
| U_ASSERT(eraIdx == 0); |
| startDates[eraIdx] = MIN_ENCODED_START; |
| } else { |
| status = U_INVALID_FORMAT_ERROR; |
| return nullptr; |
| } |
| } |
| |
| if (hasName) { |
| if (eraIdx >= firstTentativeIdx) { |
| status = U_INVALID_FORMAT_ERROR; |
| return nullptr; |
| } |
| } else { |
| if (eraIdx < firstTentativeIdx) { |
| firstTentativeIdx = eraIdx; |
| } |
| } |
| } |
| |
| EraRules *result; |
| if (firstTentativeIdx < MAX_INT32 && !includeTentativeEra) { |
| result = new EraRules(startDates, firstTentativeIdx); |
| } else { |
| result = new EraRules(startDates, numEras); |
| } |
| |
| if (result == nullptr) { |
| status = U_MEMORY_ALLOCATION_ERROR; |
| } |
| return result; |
| } |
| |
| void EraRules::getStartDate(int32_t eraIdx, int32_t (&fields)[3], UErrorCode& status) const { |
| if(U_FAILURE(status)) { |
| return; |
| } |
| if (eraIdx < 0 || eraIdx >= numEras) { |
| status = U_ILLEGAL_ARGUMENT_ERROR; |
| return; |
| } |
| decodeDate(startDates[eraIdx], fields); |
| } |
| |
| int32_t EraRules::getStartYear(int32_t eraIdx, UErrorCode& status) const { |
| int year = MAX_INT32; // bogus value |
| if(U_FAILURE(status)) { |
| return year; |
| } |
| if (eraIdx < 0 || eraIdx >= numEras) { |
| status = U_ILLEGAL_ARGUMENT_ERROR; |
| return year; |
| } |
| int fields[3]; |
| decodeDate(startDates[eraIdx], fields); |
| year = fields[0]; |
| |
| return year; |
| } |
| |
| int32_t EraRules::getEraIndex(int32_t year, int32_t month, int32_t day, UErrorCode& status) const { |
| if(U_FAILURE(status)) { |
| return -1; |
| } |
| |
| if (month < 1 || month > 12 || day < 1 || day > 31) { |
| status = U_ILLEGAL_ARGUMENT_ERROR; |
| return -1; |
| } |
| int32_t high = numEras; // last index + 1 |
| int32_t low; |
| |
| // Short circuit for recent years. Most modern computations will |
| // occur in the last few eras. |
| if (compareEncodedDateWithYMD(startDates[getCurrentEraIndex()], year, month, day) <= 0) { |
| low = getCurrentEraIndex(); |
| } else { |
| low = 0; |
| } |
| |
| // Do binary search |
| while (low < high - 1) { |
| int i = (low + high) / 2; |
| if (compareEncodedDateWithYMD(startDates[i], year, month, day) <= 0) { |
| low = i; |
| } else { |
| high = i; |
| } |
| } |
| return low; |
| } |
| |
| void EraRules::initCurrentEra() { |
| // Compute local wall time in millis using ICU's default time zone. |
| UErrorCode ec = U_ZERO_ERROR; |
| UDate localMillis = ucal_getNow(); |
| |
| int32_t rawOffset, dstOffset; |
| TimeZone* zone = TimeZone::createDefault(); |
| // If we failed to create the default time zone, we are in a bad state and don't |
| // really have many options. Carry on using UTC millis as a fallback. |
| if (zone != nullptr) { |
| zone->getOffset(localMillis, FALSE, rawOffset, dstOffset, ec); |
| delete zone; |
| localMillis += (rawOffset + dstOffset); |
| } |
| |
| int year, month0, dom, dow, doy, mid; |
| Grego::timeToFields(localMillis, year, month0, dom, dow, doy, mid); |
| int currentEncodedDate = encodeDate(year, month0 + 1 /* changes to 1-base */, dom); |
| int eraIdx = numEras - 1; |
| while (eraIdx > 0) { |
| if (currentEncodedDate >= startDates[eraIdx]) { |
| break; |
| } |
| eraIdx--; |
| } |
| // Note: current era could be before the first era. |
| // In this case, this implementation returns the first era index (0). |
| currentEra = eraIdx; |
| } |
| |
| U_NAMESPACE_END |
| #endif /* #if !UCONFIG_NO_FORMATTING */ |
| |
| |
