tzdb_data/lib.rs
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// SPDX-License-Identifier: MIT-0
//
// Copyright 2022-2024 René Kijewski <crates.io@k6i.de>
#![cfg_attr(docsrs, feature(doc_cfg))]
#![allow(unknown_lints)]
#![forbid(unsafe_code)]
#![warn(absolute_paths_not_starting_with_crate)]
#![warn(elided_lifetimes_in_paths)]
#![warn(explicit_outlives_requirements)]
#![warn(meta_variable_misuse)]
#![warn(missing_copy_implementations)]
#![warn(missing_debug_implementations)]
#![warn(missing_docs)]
#![warn(non_ascii_idents)]
#![warn(noop_method_call)]
#![warn(single_use_lifetimes)]
#![warn(trivial_casts)]
#![warn(unreachable_pub)]
#![warn(unused_extern_crates)]
#![warn(unused_lifetimes)]
#![warn(unused_results)]
#![allow(clippy::single_match_else)]
#![allow(clippy::type_complexity)]
#![no_std]
//! # `tzdb_data` — Time Zone Database
//!
//! [](https://github.com/Kijewski/tzdb/actions/workflows/ci.yml)
//! [](https://crates.io/crates/tzdb_data)
//! 
//! [](https://github.com/Kijewski/tzdb/blob/v0.6.1/tzdb_data/LICENSE.md "License: MIT-0")
//!
//! Static, `#![no_std]` time zone information for tz-rs
//!
//! This crate provides all time zones found in the [Time Zone Database](https://www.iana.org/time-zones).
//!
//! ## Usage examples
//!
//! ```rust
//! // access by identifier
//! let time_zone = tzdb_data::time_zone::europe::KYIV;
//! // access by name
//! let time_zone = tzdb_data::find_tz(b"Europe/Berlin").unwrap();
//! // names are case insensitive
//! let time_zone = tzdb_data::find_tz(b"ArCtIc/LoNgYeArByEn").unwrap();
//! ```
//!
mod generated;
#[cfg_attr(docsrs, doc(inline))]
pub use crate::generated::{time_zone, TZ_NAMES, VERSION, VERSION_HASH};
/// Find a time zone by name, e.g. `b"Europe/Berlin"` (case-insensitive)
///
/// # Example
///
/// ```
/// assert_eq!(
/// &tzdb_data::time_zone::europe::BERLIN,
/// tzdb_data::find_tz(b"Europe/Berlin").unwrap(),
/// );
/// ```
#[inline]
#[must_use]
pub const fn find_tz(s: &[u8]) -> Option<&'static tz::TimeZoneRef<'static>> {
match generated::by_name::find_key(s) {
Some(key) => Some(generated::by_name::TIME_ZONES[key as u16 as usize]),
None => None,
}
}
/// Find the raw, unparsed time zone data by name, e.g. `b"Europe/Berlin"` (case-insensitive)
///
/// # Example
///
/// ```
/// assert_eq!(
/// tzdb_data::time_zone::europe::RAW_BERLIN,
/// tzdb_data::find_raw(b"Europe/Berlin").unwrap(),
/// );
/// ```
#[inline]
#[must_use]
pub const fn find_raw(s: &[u8]) -> Option<&'static [u8]> {
match generated::by_name::find_key(s) {
Some(key) => Some(generated::by_name::RAW_TIME_ZONES[key as u16 as usize]),
None => None,
}
}
#[allow(clippy::out_of_bounds_indexing)]
#[must_use]
const fn new_time_zone_ref(
transitions: &'static [tz::timezone::Transition],
local_time_types: &'static [tz::LocalTimeType],
leap_seconds: &'static [tz::timezone::LeapSecond],
extra_rule: &'static Option<tz::timezone::TransitionRule>,
) -> tz::timezone::TimeZoneRef<'static> {
match tz::timezone::TimeZoneRef::new(transitions, local_time_types, leap_seconds, extra_rule) {
Ok(value) => value,
Err(_) => {
#[allow(unconditional_panic)]
let err = [][0];
err
},
}
}
#[allow(clippy::out_of_bounds_indexing)]
#[must_use]
const fn new_local_time_type(
ut_offset: i32,
is_dst: bool,
time_zone_designation: Option<&[u8]>,
) -> tz::LocalTimeType {
match tz::LocalTimeType::new(ut_offset, is_dst, time_zone_designation) {
Ok(value) => value,
Err(_) => {
#[allow(unconditional_panic)]
let err = [][0];
err
},
}
}
#[must_use]
const fn new_transition(
unix_leap_time: i64,
local_time_type_index: usize,
) -> tz::timezone::Transition {
tz::timezone::Transition::new(unix_leap_time, local_time_type_index)
}
#[allow(clippy::out_of_bounds_indexing)]
#[must_use]
const fn new_alternate_time(
std: tz::LocalTimeType,
dst: tz::LocalTimeType,
dst_start: tz::timezone::RuleDay,
dst_start_time: i32,
dst_end: tz::timezone::RuleDay,
dst_end_time: i32,
) -> tz::timezone::AlternateTime {
match tz::timezone::AlternateTime::new(
std,
dst,
dst_start,
dst_start_time,
dst_end,
dst_end_time,
) {
Ok(value) => value,
Err(_) => {
#[allow(unconditional_panic)]
let err = [][0];
err
},
}
}
#[allow(clippy::out_of_bounds_indexing)]
#[must_use]
const fn new_month_week_day(month: u8, week: u8, week_day: u8) -> tz::timezone::MonthWeekDay {
match tz::timezone::MonthWeekDay::new(month, week, week_day) {
Ok(value) => value,
Err(_) => {
#[allow(unconditional_panic)]
let err = [][0];
err
},
}
}
// This implementation allows for invalid equalities like `b'-' == b'\x7f'`, but that's OK.
//
// The only troublesome characters are:
// @ -> `
// [ -> {
// \ -> |
// ] -> }
// ^ -> ~
// _ -> DEL
//
// None the these characters have a "false lower case" variant which can occur in the input.
// This function is 40% faster than the variant in rust's core library, which is implemented
// more strictly.
#[inline]
#[must_use]
const fn eq_ignore_ascii_case(a: &[u8], b: &[u8]) -> bool {
if a.len() != b.len() {
return false;
}
// Cannot use for-loops in const fn.
let mut i = 0;
while i < a.len() {
if (a[i] | 0x20) != (b[i] | 0x20) {
return false;
}
i += 1;
}
true
}