Struct icu_timezone::TimeZoneIdMapperBorrowed

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

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

Fields

data: &'a IanaToBcp47MapV2<'a>

Implementations

impl<'a> TimeZoneIdMapperBorrowed<'a>

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);

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.

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);

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);

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:

1. TimeZoneIdMapperBorrowed::canonicalize_iana() is faster if you have an IANA ID.
2. 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);

fn iana_lookup_quick(&self, iana_id: impl AsRef<[u8]>) -> Option<IanaTrieValue>

Queries the data for iana_id without recording the normalized string. This is a fast, no-alloc lookup.

fn iana_lookup_with_normalization<'l, 's>( &'l self, iana_id: &'s str, cursor_fn: impl FnMut(&ZeroAsciiIgnoreCaseTrieCursor<'l>), ) -> Option<(IanaTrieValue, Cow<'s, str>)>

Queries the data for iana_id while keeping track of the normalized string. This is a fast lookup, but it may require allocating memory.

fn iana_search( &self, needle: IanaTrieValue, string: String, stack: Vec<(ZeroAsciiIgnoreCaseTrieCursor<'_>, usize, usize)>, ) -> Option<String>

Performs a reverse lookup by walking the trie with an optional start position. This is not a fast operation since it requires a linear search.

Trait Implementations

impl<'a> Clone for TimeZoneIdMapperBorrowed<'a>

fn clone(&self) -> TimeZoneIdMapperBorrowed<'a>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<'a> Debug for TimeZoneIdMapperBorrowed<'a>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'a> Copy for TimeZoneIdMapperBorrowed<'a>