QSet<QByteArray> QIcuTimeZonePrivate::availableTimeZoneIds() const
{
UErrorCode status = U_ZERO_ERROR;
UEnumeration *uenum = ucal_openTimeZones(&status);
QSet<QByteArray> set;
if (U_SUCCESS(status))
set = uenumToIdSet(uenum);
uenum_close(uenum);
return set;
}
static String canonicalizeTimeZoneName(const String& timeZoneName)
{
// 6.4.1 IsValidTimeZoneName (timeZone)
// The abstract operation returns true if timeZone, converted to upper case as described in 6.1, is equal to one of the Zone or Link names of the IANA Time Zone Database, converted to upper case as described in 6.1. It returns false otherwise.
UErrorCode status = U_ZERO_ERROR;
UEnumeration* timeZones = ucal_openTimeZones(&status);
ASSERT(U_SUCCESS(status));
String canonical;
do {
status = U_ZERO_ERROR;
int32_t ianaTimeZoneLength;
// Time zone names are respresented as UChar[] in all related ICU apis.
const UChar* ianaTimeZone = uenum_unext(timeZones, &ianaTimeZoneLength, &status);
ASSERT(U_SUCCESS(status));
// End of enumeration.
if (!ianaTimeZone)
break;
StringView ianaTimeZoneView(ianaTimeZone, ianaTimeZoneLength);
if (!equalIgnoringASCIICase(timeZoneName, ianaTimeZoneView))
continue;
// Found a match, now canonicalize.
// 6.4.2 CanonicalizeTimeZoneName (timeZone) (ECMA-402 2.0)
// 1. Let ianaTimeZone be the Zone or Link name of the IANA Time Zone Database such that timeZone, converted to upper case as described in 6.1, is equal to ianaTimeZone, converted to upper case as described in 6.1.
// 2. If ianaTimeZone is a Link name, then let ianaTimeZone be the corresponding Zone name as specified in the “backward” file of the IANA Time Zone Database.
Vector<UChar, 32> buffer(ianaTimeZoneLength);
status = U_ZERO_ERROR;
auto canonicalLength = ucal_getCanonicalTimeZoneID(ianaTimeZone, ianaTimeZoneLength, buffer.data(), ianaTimeZoneLength, nullptr, &status);
if (status == U_BUFFER_OVERFLOW_ERROR) {
buffer.grow(canonicalLength);
status = U_ZERO_ERROR;
ucal_getCanonicalTimeZoneID(ianaTimeZone, ianaTimeZoneLength, buffer.data(), canonicalLength, nullptr, &status);
}
ASSERT(U_SUCCESS(status));
canonical = String(buffer.data(), canonicalLength);
} while (canonical.isNull());
uenum_close(timeZones);
// 3. If ianaTimeZone is "Etc/UTC" or "Etc/GMT", then return "UTC".
if (canonical == "Etc/UTC" || canonical == "Etc/GMT")
canonical = ASCIILiteral("UTC");
// 4. Return ianaTimeZone.
return canonical;
}
/**
* call-seq:
* UCalendar.time_zones
*
* Returns array with all time zones (as UString values).
*/
VALUE icu4r_cal_all_tz (VALUE obj)
{
UErrorCode status = U_ZERO_ERROR;
UEnumeration * zones ;
VALUE ret ;
UChar * name;
int32_t len;
zones = ucal_openTimeZones (&status);
ICU_RAISE(status);
ret = rb_ary_new();
while( (name = (UChar*)uenum_unext(zones, &len, &status))) {
rb_ary_push(ret, icu_ustr_new(name, len));
}
uenum_close(zones);
return ret;
}
