Struct icu_timezone::ids::TimeZoneIdMapperBorrowed

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pub struct TimeZoneIdMapperBorrowed<'a> {
    data: &'a IanaToBcp47MapV2<'a>,
}

Expand description

A borrowed wrapper around the time zone ID mapper, returned by TimeZoneIdMapper::as_borrowed(). More efficient to query.

Fields§

§data: &'a IanaToBcp47MapV2<'a>

Implementations§

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impl<'a> TimeZoneIdMapperBorrowed<'a>

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pub fn iana_to_bcp47(&self, iana_id: &str) -> Option<TimeZoneBcp47Id>

Gets the BCP-47 time zone ID from an IANA time zone ID with a case-insensitive lookup.

Returns None if the IANA ID is not found.

§Examples

use icu_timezone::TimeZoneBcp47Id;
use icu_timezone::TimeZoneIdMapper;

let mapper = TimeZoneIdMapper::new();
let mapper = mapper.as_borrowed();

let result = mapper.iana_to_bcp47("Asia/CALCUTTA").unwrap();

assert_eq!(*result, "inccu");

// Unknown IANA time zone ID:
assert_eq!(mapper.iana_to_bcp47("America/San_Francisco"), None);

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pub fn iana_bytes_to_bcp47(&self, iana_id: &[u8]) -> Option<TimeZoneBcp47Id>

Same as Self::iana_to_bcp47() but works with potentially ill-formed UTF-8.

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pub fn normalize_iana<'s>( &self, iana_id: &'s str, ) -> Option<(Cow<'s, str>, TimeZoneBcp47Id)>

Normalizes the syntax of an IANA time zone ID.

Also returns the BCP-47 time zone ID.

Returns None if the IANA ID is not found.

§Examples

use icu_timezone::TimeZoneBcp47Id;
use icu_timezone::TimeZoneIdMapper;
use std::borrow::Cow;

let mapper = TimeZoneIdMapper::new();
let mapper = mapper.as_borrowed();

let result = mapper.normalize_iana("Asia/CALCUTTA").unwrap();

assert_eq!(result.0, "Asia/Calcutta");
assert!(matches!(result.0, Cow::Owned(_)));
assert_eq!(*result.1, "inccu");

// Borrows when able:
let result = mapper.normalize_iana("America/Chicago").unwrap();
assert_eq!(result.0, "America/Chicago");
assert!(matches!(result.0, Cow::Borrowed(_)));

// Unknown IANA time zone ID:
assert_eq!(mapper.normalize_iana("America/San_Francisco"), None);

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pub fn canonicalize_iana<'s>( &self, iana_id: &'s str, ) -> Option<(Cow<'s, str>, TimeZoneBcp47Id)>

Returns the canonical, normalized identifier of the given IANA time zone.

Also returns the BCP-47 time zone ID.

Returns None if the IANA ID is not found.

§Examples

use icu_timezone::TimeZoneBcp47Id;
use icu_timezone::TimeZoneIdMapper;
use std::borrow::Cow;

let mapper = TimeZoneIdMapper::new();
let mapper = mapper.as_borrowed();

let result = mapper.canonicalize_iana("Asia/CALCUTTA").unwrap();

assert_eq!(result.0, "Asia/Kolkata");
assert!(matches!(result.0, Cow::Owned(_)));
assert_eq!(*result.1, "inccu");

// Borrows when able:
let result = mapper.canonicalize_iana("America/Chicago").unwrap();
assert_eq!(result.0, "America/Chicago");
assert!(matches!(result.0, Cow::Borrowed(_)));

// Unknown IANA time zone ID:
assert_eq!(mapper.canonicalize_iana("America/San_Francisco"), None);

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pub fn find_canonical_iana_from_bcp47( &self, bcp47_id: TimeZoneBcp47Id, ) -> Option<String>

Returns the canonical, normalized IANA ID of the given BCP-47 ID.

This function performs a linear search over all IANA IDs. If this is problematic, consider one of the following functions instead:

TimeZoneIdMapperBorrowed::canonicalize_iana() is faster if you have an IANA ID.
TimeZoneIdMapperWithFastCanonicalizationBorrowed::canonical_iana_from_bcp47() is faster, but it requires loading additional data (see TimeZoneIdMapperWithFastCanonicalization).

Returns None if the BCP-47 ID is not found.

§Examples

use icu_timezone::TimeZoneBcp47Id;
use icu_timezone::TimeZoneIdMapper;
use std::borrow::Cow;
use tinystr::tinystr;

let mapper = TimeZoneIdMapper::new();
let mapper = mapper.as_borrowed();

let bcp47_id = TimeZoneBcp47Id(tinystr!(8, "inccu"));
let result = mapper.find_canonical_iana_from_bcp47(bcp47_id).unwrap();

assert_eq!(result, "Asia/Kolkata");

// Unknown BCP-47 time zone ID:
let bcp47_id = TimeZoneBcp47Id(tinystr!(8, "ussfo"));
assert_eq!(mapper.find_canonical_iana_from_bcp47(bcp47_id), None);