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<a href="#922" id="922">922</a>
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</pre><pre class="rust"><code><span class="doccomment">//! Types related to a time zone.
</span><span class="kw">use </span>std::fs::{<span class="self">self</span>, File};
<span class="kw">use </span>std::io::{<span class="self">self</span>, Read};
<span class="kw">use </span>std::path::{Path, PathBuf};
<span class="kw">use </span>std::{cmp::Ordering, fmt, str};
<span class="kw">use </span><span class="kw">super</span>::rule::{AlternateTime, TransitionRule};
<span class="kw">use super</span>::{parser, Error, DAYS_PER_WEEK, SECONDS_PER_DAY};
<span class="doccomment">/// Time zone
</span><span class="attr">#[derive(Debug, Clone, Eq, PartialEq)]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>TimeZone {
<span class="doccomment">/// List of transitions
</span>transitions: Vec<Transition>,
<span class="doccomment">/// List of local time types (cannot be empty)
</span>local_time_types: Vec<LocalTimeType>,
<span class="doccomment">/// List of leap seconds
</span>leap_seconds: Vec<LeapSecond>,
<span class="doccomment">/// Extra transition rule applicable after the last transition
</span>extra_rule: <span class="prelude-ty">Option</span><TransitionRule>,
}
<span class="kw">impl </span>TimeZone {
<span class="doccomment">/// Returns local time zone.
///
/// This method in not supported on non-UNIX platforms, and returns the UTC time zone instead.
///
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>local(env_tz: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>str>) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">match </span>env_tz {
<span class="prelude-val">Some</span>(tz) => <span class="self">Self</span>::from_posix_tz(tz),
<span class="prelude-val">None </span>=> <span class="self">Self</span>::from_posix_tz(<span class="string">"localtime"</span>),
}
}
<span class="doccomment">/// Construct a time zone from a POSIX TZ string, as described in [the POSIX documentation of the `TZ` environment variable](https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/V1_chap08.html).
</span><span class="kw">fn </span>from_posix_tz(tz_string: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">if </span>tz_string.is_empty() {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::InvalidTzString(<span class="string">"empty TZ string"</span>));
}
<span class="kw">if </span>tz_string == <span class="string">"localtime" </span>{
<span class="kw">return </span><span class="self">Self</span>::from_tz_data(<span class="kw-2">&</span>fs::read(<span class="string">"/etc/localtime"</span>)<span class="question-mark">?</span>);
}
<span class="comment">// attributes are not allowed on if blocks in Rust 1.38
</span><span class="attr">#[cfg(target_os = <span class="string">"android"</span>)]
</span>{
<span class="kw">if let </span><span class="prelude-val">Ok</span>(bytes) = android_tzdata::find_tz_data(tz_string) {
<span class="kw">return </span><span class="self">Self</span>::from_tz_data(<span class="kw-2">&</span>bytes);
}
}
<span class="kw">let </span><span class="kw-2">mut </span>chars = tz_string.chars();
<span class="kw">if </span>chars.next() == <span class="prelude-val">Some</span>(<span class="string">':'</span>) {
<span class="kw">return </span><span class="self">Self</span>::from_file(<span class="kw-2">&mut </span>find_tz_file(chars.as_str())<span class="question-mark">?</span>);
}
<span class="kw">if let </span><span class="prelude-val">Ok</span>(<span class="kw-2">mut </span>file) = find_tz_file(tz_string) {
<span class="kw">return </span><span class="self">Self</span>::from_file(<span class="kw-2">&mut </span>file);
}
<span class="comment">// TZ string extensions are not allowed
</span><span class="kw">let </span>tz_string = tz_string.trim_matches(|c: char| c.is_ascii_whitespace());
<span class="kw">let </span>rule = TransitionRule::from_tz_string(tz_string.as_bytes(), <span class="bool-val">false</span>)<span class="question-mark">?</span>;
<span class="self">Self</span>::new(
<span class="macro">vec!</span>[],
<span class="kw">match </span>rule {
TransitionRule::Fixed(local_time_type) => <span class="macro">vec!</span>[local_time_type],
TransitionRule::Alternate(AlternateTime { std, dst, .. }) => <span class="macro">vec!</span>[std, dst],
},
<span class="macro">vec!</span>[],
<span class="prelude-val">Some</span>(rule),
)
}
<span class="doccomment">/// Construct a time zone
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(
transitions: Vec<Transition>,
local_time_types: Vec<LocalTimeType>,
leap_seconds: Vec<LeapSecond>,
extra_rule: <span class="prelude-ty">Option</span><TransitionRule>,
) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">let </span>new = <span class="self">Self </span>{ transitions, local_time_types, leap_seconds, extra_rule };
new.as_ref().validate()<span class="question-mark">?</span>;
<span class="prelude-val">Ok</span>(new)
}
<span class="doccomment">/// Construct a time zone from the contents of a time zone file
</span><span class="kw">fn </span>from_file(file: <span class="kw-2">&mut </span>File) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">let </span><span class="kw-2">mut </span>bytes = Vec::new();
file.read_to_end(<span class="kw-2">&mut </span>bytes)<span class="question-mark">?</span>;
<span class="self">Self</span>::from_tz_data(<span class="kw-2">&</span>bytes)
}
<span class="doccomment">/// Construct a time zone from the contents of a time zone file
///
/// Parse TZif data as described in [RFC 8536](https://datatracker.ietf.org/doc/html/rfc8536).
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>from_tz_data(bytes: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
parser::parse(bytes)
}
<span class="doccomment">/// Construct a time zone with the specified UTC offset in seconds
</span><span class="kw">fn </span>fixed(ut_offset: i32) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="prelude-val">Ok</span>(<span class="self">Self </span>{
transitions: Vec::new(),
local_time_types: <span class="macro">vec!</span>[LocalTimeType::with_offset(ut_offset)<span class="question-mark">?</span>],
leap_seconds: Vec::new(),
extra_rule: <span class="prelude-val">None</span>,
})
}
<span class="doccomment">/// Construct the time zone associated to UTC
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>utc() -> <span class="self">Self </span>{
<span class="self">Self </span>{
transitions: Vec::new(),
local_time_types: <span class="macro">vec!</span>[LocalTimeType::UTC],
leap_seconds: Vec::new(),
extra_rule: <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Find the local time type associated to the time zone at the specified Unix time in seconds
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>find_local_time_type(<span class="kw-2">&</span><span class="self">self</span>, unix_time: i64) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span>LocalTimeType, Error> {
<span class="self">self</span>.as_ref().find_local_time_type(unix_time)
}
<span class="comment">// should we pass NaiveDateTime all the way through to this fn?
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>find_local_time_type_from_local(
<span class="kw-2">&</span><span class="self">self</span>,
local_time: i64,
year: i32,
) -> <span class="prelude-ty">Result</span><<span class="kw">crate</span>::LocalResult<LocalTimeType>, Error> {
<span class="self">self</span>.as_ref().find_local_time_type_from_local(local_time, year)
}
<span class="doccomment">/// Returns a reference to the time zone
</span><span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> TimeZoneRef {
TimeZoneRef {
transitions: <span class="kw-2">&</span><span class="self">self</span>.transitions,
local_time_types: <span class="kw-2">&</span><span class="self">self</span>.local_time_types,
leap_seconds: <span class="kw-2">&</span><span class="self">self</span>.leap_seconds,
extra_rule: <span class="kw-2">&</span><span class="self">self</span>.extra_rule,
}
}
}
<span class="doccomment">/// Reference to a time zone
</span><span class="attr">#[derive(Debug, Copy, Clone, Eq, PartialEq)]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>TimeZoneRef<<span class="lifetime">'a</span>> {
<span class="doccomment">/// List of transitions
</span>transitions: <span class="kw-2">&</span><span class="lifetime">'a </span>[Transition],
<span class="doccomment">/// List of local time types (cannot be empty)
</span>local_time_types: <span class="kw-2">&</span><span class="lifetime">'a </span>[LocalTimeType],
<span class="doccomment">/// List of leap seconds
</span>leap_seconds: <span class="kw-2">&</span><span class="lifetime">'a </span>[LeapSecond],
<span class="doccomment">/// Extra transition rule applicable after the last transition
</span>extra_rule: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="prelude-ty">Option</span><TransitionRule>,
}
<span class="kw">impl</span><<span class="lifetime">'a</span>> TimeZoneRef<<span class="lifetime">'a</span>> {
<span class="doccomment">/// Find the local time type associated to the time zone at the specified Unix time in seconds
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>find_local_time_type(<span class="kw-2">&</span><span class="self">self</span>, unix_time: i64) -> <span class="prelude-ty">Result</span><<span class="kw-2">&</span><span class="lifetime">'a </span>LocalTimeType, Error> {
<span class="kw">let </span>extra_rule = <span class="kw">match </span><span class="self">self</span>.transitions.last() {
<span class="prelude-val">None </span>=> <span class="kw">match </span><span class="self">self</span>.extra_rule {
<span class="prelude-val">Some</span>(extra_rule) => extra_rule,
<span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw-2">&</span><span class="self">self</span>.local_time_types[<span class="number">0</span>]),
},
<span class="prelude-val">Some</span>(last_transition) => {
<span class="kw">let </span>unix_leap_time = <span class="kw">match </span><span class="self">self</span>.unix_time_to_unix_leap_time(unix_time) {
<span class="prelude-val">Ok</span>(unix_leap_time) => unix_leap_time,
<span class="prelude-val">Err</span>(Error::OutOfRange(error)) => <span class="kw">return </span><span class="prelude-val">Err</span>(Error::FindLocalTimeType(error)),
<span class="prelude-val">Err</span>(err) => <span class="kw">return </span><span class="prelude-val">Err</span>(err),
};
<span class="kw">if </span>unix_leap_time >= last_transition.unix_leap_time {
<span class="kw">match </span><span class="self">self</span>.extra_rule {
<span class="prelude-val">Some</span>(extra_rule) => extra_rule,
<span class="prelude-val">None </span>=> {
<span class="comment">// RFC 8536 3.2:
// "Local time for timestamps on or after the last transition is
// specified by the TZ string in the footer (Section 3.3) if present
// and nonempty; otherwise, it is unspecified."
//
// Older versions of macOS (1.12 and before?) have TZif file with a
// missing TZ string, and use the offset given by the last transition.
</span><span class="kw">return </span><span class="prelude-val">Ok</span>(
<span class="kw-2">&</span><span class="self">self</span>.local_time_types[last_transition.local_time_type_index]
);
}
}
} <span class="kw">else </span>{
<span class="kw">let </span>index = <span class="kw">match </span><span class="self">self
</span>.transitions
.binary_search_by_key(<span class="kw-2">&</span>unix_leap_time, Transition::unix_leap_time)
{
<span class="prelude-val">Ok</span>(x) => x + <span class="number">1</span>,
<span class="prelude-val">Err</span>(x) => x,
};
<span class="kw">let </span>local_time_type_index = <span class="kw">if </span>index > <span class="number">0 </span>{
<span class="self">self</span>.transitions[index - <span class="number">1</span>].local_time_type_index
} <span class="kw">else </span>{
<span class="number">0
</span>};
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw-2">&</span><span class="self">self</span>.local_time_types[local_time_type_index]);
}
}
};
<span class="kw">match </span>extra_rule.find_local_time_type(unix_time) {
<span class="prelude-val">Ok</span>(local_time_type) => <span class="prelude-val">Ok</span>(local_time_type),
<span class="prelude-val">Err</span>(Error::OutOfRange(error)) => <span class="prelude-val">Err</span>(Error::FindLocalTimeType(error)),
err => err,
}
}
<span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>find_local_time_type_from_local(
<span class="kw-2">&</span><span class="self">self</span>,
local_time: i64,
year: i32,
) -> <span class="prelude-ty">Result</span><<span class="kw">crate</span>::LocalResult<LocalTimeType>, Error> {
<span class="comment">// #TODO: this is wrong as we need 'local_time_to_local_leap_time ?
// but ... does the local time even include leap seconds ??
// let unix_leap_time = match self.unix_time_to_unix_leap_time(local_time) {
// Ok(unix_leap_time) => unix_leap_time,
// Err(Error::OutOfRange(error)) => return Err(Error::FindLocalTimeType(error)),
// Err(err) => return Err(err),
// };
</span><span class="kw">let </span>local_leap_time = local_time;
<span class="comment">// if we have at least one transition,
// we must check _all_ of them, incase of any Overlapping (LocalResult::Ambiguous) or Skipping (LocalResult::None) transitions
</span><span class="kw">let </span>offset_after_last = <span class="kw">if </span>!<span class="self">self</span>.transitions.is_empty() {
<span class="kw">let </span><span class="kw-2">mut </span>prev = <span class="self">self</span>.local_time_types[<span class="number">0</span>];
<span class="kw">for </span>transition <span class="kw">in </span><span class="self">self</span>.transitions {
<span class="kw">let </span>after_ltt = <span class="self">self</span>.local_time_types[transition.local_time_type_index];
<span class="comment">// the end and start here refers to where the time starts prior to the transition
// and where it ends up after. not the temporal relationship.
</span><span class="kw">let </span>transition_end = transition.unix_leap_time + i64::from(after_ltt.ut_offset);
<span class="kw">let </span>transition_start = transition.unix_leap_time + i64::from(prev.ut_offset);
<span class="kw">match </span>transition_start.cmp(<span class="kw-2">&</span>transition_end) {
Ordering::Greater => {
<span class="comment">// bakwards transition, eg from DST to regular
// this means a given local time could have one of two possible offsets
</span><span class="kw">if </span>local_leap_time < transition_end {
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(prev));
} <span class="kw">else if </span>local_leap_time >= transition_end
&& local_leap_time <= transition_start
{
<span class="kw">if </span>prev.ut_offset < after_ltt.ut_offset {
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Ambiguous(prev, after_ltt));
} <span class="kw">else </span>{
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Ambiguous(after_ltt, prev));
}
}
}
Ordering::Equal => {
<span class="comment">// should this ever happen? presumably we have to handle it anyway.
</span><span class="kw">if </span>local_leap_time < transition_start {
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(prev));
} <span class="kw">else if </span>local_leap_time == transition_end {
<span class="kw">if </span>prev.ut_offset < after_ltt.ut_offset {
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Ambiguous(prev, after_ltt));
} <span class="kw">else </span>{
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Ambiguous(after_ltt, prev));
}
}
}
Ordering::Less => {
<span class="comment">// forwards transition, eg from regular to DST
// this means that times that are skipped are invalid local times
</span><span class="kw">if </span>local_leap_time <= transition_start {
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(prev));
} <span class="kw">else if </span>local_leap_time < transition_end {
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::None);
} <span class="kw">else if </span>local_leap_time == transition_end {
<span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(after_ltt));
}
}
}
<span class="comment">// try the next transition, we are fully after this one
</span>prev = after_ltt;
}
prev
} <span class="kw">else </span>{
<span class="self">self</span>.local_time_types[<span class="number">0</span>]
};
<span class="kw">if let </span><span class="prelude-val">Some</span>(extra_rule) = <span class="self">self</span>.extra_rule {
<span class="kw">match </span>extra_rule.find_local_time_type_from_local(local_time, year) {
<span class="prelude-val">Ok</span>(local_time_type) => <span class="prelude-val">Ok</span>(local_time_type),
<span class="prelude-val">Err</span>(Error::OutOfRange(error)) => <span class="prelude-val">Err</span>(Error::FindLocalTimeType(error)),
err => err,
}
} <span class="kw">else </span>{
<span class="prelude-val">Ok</span>(<span class="kw">crate</span>::LocalResult::Single(offset_after_last))
}
}
<span class="doccomment">/// Check time zone inputs
</span><span class="kw">fn </span>validate(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><(), Error> {
<span class="comment">// Check local time types
</span><span class="kw">let </span>local_time_types_size = <span class="self">self</span>.local_time_types.len();
<span class="kw">if </span>local_time_types_size == <span class="number">0 </span>{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TimeZone(<span class="string">"list of local time types must not be empty"</span>));
}
<span class="comment">// Check transitions
</span><span class="kw">let </span><span class="kw-2">mut </span>i_transition = <span class="number">0</span>;
<span class="kw">while </span>i_transition < <span class="self">self</span>.transitions.len() {
<span class="kw">if </span><span class="self">self</span>.transitions[i_transition].local_time_type_index >= local_time_types_size {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TimeZone(<span class="string">"invalid local time type index"</span>));
}
<span class="kw">if </span>i_transition + <span class="number">1 </span>< <span class="self">self</span>.transitions.len()
&& <span class="self">self</span>.transitions[i_transition].unix_leap_time
>= <span class="self">self</span>.transitions[i_transition + <span class="number">1</span>].unix_leap_time
{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TimeZone(<span class="string">"invalid transition"</span>));
}
i_transition += <span class="number">1</span>;
}
<span class="comment">// Check leap seconds
</span><span class="kw">if </span>!(<span class="self">self</span>.leap_seconds.is_empty()
|| <span class="self">self</span>.leap_seconds[<span class="number">0</span>].unix_leap_time >= <span class="number">0
</span>&& <span class="self">self</span>.leap_seconds[<span class="number">0</span>].correction.saturating_abs() == <span class="number">1</span>)
{
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TimeZone(<span class="string">"invalid leap second"</span>));
}
<span class="kw">let </span>min_interval = SECONDS_PER_28_DAYS - <span class="number">1</span>;
<span class="kw">let </span><span class="kw-2">mut </span>i_leap_second = <span class="number">0</span>;
<span class="kw">while </span>i_leap_second < <span class="self">self</span>.leap_seconds.len() {
<span class="kw">if </span>i_leap_second + <span class="number">1 </span>< <span class="self">self</span>.leap_seconds.len() {
<span class="kw">let </span>x0 = <span class="kw-2">&</span><span class="self">self</span>.leap_seconds[i_leap_second];
<span class="kw">let </span>x1 = <span class="kw-2">&</span><span class="self">self</span>.leap_seconds[i_leap_second + <span class="number">1</span>];
<span class="kw">let </span>diff_unix_leap_time = x1.unix_leap_time.saturating_sub(x0.unix_leap_time);
<span class="kw">let </span>abs_diff_correction =
x1.correction.saturating_sub(x0.correction).saturating_abs();
<span class="kw">if </span>!(diff_unix_leap_time >= min_interval && abs_diff_correction == <span class="number">1</span>) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TimeZone(<span class="string">"invalid leap second"</span>));
}
}
i_leap_second += <span class="number">1</span>;
}
<span class="comment">// Check extra rule
</span><span class="kw">let </span>(extra_rule, last_transition) = <span class="kw">match </span>(<span class="kw-2">&</span><span class="self">self</span>.extra_rule, <span class="self">self</span>.transitions.last()) {
(<span class="prelude-val">Some</span>(rule), <span class="prelude-val">Some</span>(trans)) => (rule, trans),
<span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(()),
};
<span class="kw">let </span>last_local_time_type = <span class="kw-2">&</span><span class="self">self</span>.local_time_types[last_transition.local_time_type_index];
<span class="kw">let </span>unix_time = <span class="kw">match </span><span class="self">self</span>.unix_leap_time_to_unix_time(last_transition.unix_leap_time) {
<span class="prelude-val">Ok</span>(unix_time) => unix_time,
<span class="prelude-val">Err</span>(Error::OutOfRange(error)) => <span class="kw">return </span><span class="prelude-val">Err</span>(Error::TimeZone(error)),
<span class="prelude-val">Err</span>(err) => <span class="kw">return </span><span class="prelude-val">Err</span>(err),
};
<span class="kw">let </span>rule_local_time_type = <span class="kw">match </span>extra_rule.find_local_time_type(unix_time) {
<span class="prelude-val">Ok</span>(rule_local_time_type) => rule_local_time_type,
<span class="prelude-val">Err</span>(Error::OutOfRange(error)) => <span class="kw">return </span><span class="prelude-val">Err</span>(Error::TimeZone(error)),
<span class="prelude-val">Err</span>(err) => <span class="kw">return </span><span class="prelude-val">Err</span>(err),
};
<span class="kw">let </span>check = last_local_time_type.ut_offset == rule_local_time_type.ut_offset
&& last_local_time_type.is_dst == rule_local_time_type.is_dst
&& <span class="kw">match </span>(<span class="kw-2">&</span>last_local_time_type.name, <span class="kw-2">&</span>rule_local_time_type.name) {
(<span class="prelude-val">Some</span>(x), <span class="prelude-val">Some</span>(y)) => x.equal(y),
(<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) => <span class="bool-val">true</span>,
<span class="kw">_ </span>=> <span class="bool-val">false</span>,
};
<span class="kw">if </span>!check {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::TimeZone(
<span class="string">"extra transition rule is inconsistent with the last transition"</span>,
));
}
<span class="prelude-val">Ok</span>(())
}
<span class="doccomment">/// Convert Unix time to Unix leap time, from the list of leap seconds in a time zone
</span><span class="kw">const fn </span>unix_time_to_unix_leap_time(<span class="kw-2">&</span><span class="self">self</span>, unix_time: i64) -> <span class="prelude-ty">Result</span><i64, Error> {
<span class="kw">let </span><span class="kw-2">mut </span>unix_leap_time = unix_time;
<span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>;
<span class="kw">while </span>i < <span class="self">self</span>.leap_seconds.len() {
<span class="kw">let </span>leap_second = <span class="kw-2">&</span><span class="self">self</span>.leap_seconds[i];
<span class="kw">if </span>unix_leap_time < leap_second.unix_leap_time {
<span class="kw">break</span>;
}
unix_leap_time = <span class="kw">match </span>unix_time.checked_add(leap_second.correction <span class="kw">as </span>i64) {
<span class="prelude-val">Some</span>(unix_leap_time) => unix_leap_time,
<span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::OutOfRange(<span class="string">"out of range operation"</span>)),
};
i += <span class="number">1</span>;
}
<span class="prelude-val">Ok</span>(unix_leap_time)
}
<span class="doccomment">/// Convert Unix leap time to Unix time, from the list of leap seconds in a time zone
</span><span class="kw">fn </span>unix_leap_time_to_unix_time(<span class="kw-2">&</span><span class="self">self</span>, unix_leap_time: i64) -> <span class="prelude-ty">Result</span><i64, Error> {
<span class="kw">if </span>unix_leap_time == i64::min_value() {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::OutOfRange(<span class="string">"out of range operation"</span>));
}
<span class="kw">let </span>index = <span class="kw">match </span><span class="self">self
</span>.leap_seconds
.binary_search_by_key(<span class="kw-2">&</span>(unix_leap_time - <span class="number">1</span>), LeapSecond::unix_leap_time)
{
<span class="prelude-val">Ok</span>(x) => x + <span class="number">1</span>,
<span class="prelude-val">Err</span>(x) => x,
};
<span class="kw">let </span>correction = <span class="kw">if </span>index > <span class="number">0 </span>{ <span class="self">self</span>.leap_seconds[index - <span class="number">1</span>].correction } <span class="kw">else </span>{ <span class="number">0 </span>};
<span class="kw">match </span>unix_leap_time.checked_sub(correction <span class="kw">as </span>i64) {
<span class="prelude-val">Some</span>(unix_time) => <span class="prelude-val">Ok</span>(unix_time),
<span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(Error::OutOfRange(<span class="string">"out of range operation"</span>)),
}
}
<span class="doccomment">/// The UTC time zone
</span><span class="kw">const </span>UTC: TimeZoneRef<<span class="lifetime">'static</span>> = TimeZoneRef {
transitions: <span class="kw-2">&</span>[],
local_time_types: <span class="kw-2">&</span>[LocalTimeType::UTC],
leap_seconds: <span class="kw-2">&</span>[],
extra_rule: <span class="kw-2">&</span><span class="prelude-val">None</span>,
};
}
<span class="doccomment">/// Transition of a TZif file
</span><span class="attr">#[derive(Debug, Copy, Clone, Eq, PartialEq)]
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>Transition {
<span class="doccomment">/// Unix leap time
</span>unix_leap_time: i64,
<span class="doccomment">/// Index specifying the local time type of the transition
</span>local_time_type_index: usize,
}
<span class="kw">impl </span>Transition {
<span class="doccomment">/// Construct a TZif file transition
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">const fn </span>new(unix_leap_time: i64, local_time_type_index: usize) -> <span class="self">Self </span>{
<span class="self">Self </span>{ unix_leap_time, local_time_type_index }
}
<span class="doccomment">/// Returns Unix leap time
</span><span class="kw">const fn </span>unix_leap_time(<span class="kw-2">&</span><span class="self">self</span>) -> i64 {
<span class="self">self</span>.unix_leap_time
}
}
<span class="doccomment">/// Leap second of a TZif file
</span><span class="attr">#[derive(Debug, Copy, Clone, Eq, PartialEq)]
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>LeapSecond {
<span class="doccomment">/// Unix leap time
</span>unix_leap_time: i64,
<span class="doccomment">/// Leap second correction
</span>correction: i32,
}
<span class="kw">impl </span>LeapSecond {
<span class="doccomment">/// Construct a TZif file leap second
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">const fn </span>new(unix_leap_time: i64, correction: i32) -> <span class="self">Self </span>{
<span class="self">Self </span>{ unix_leap_time, correction }
}
<span class="doccomment">/// Returns Unix leap time
</span><span class="kw">const fn </span>unix_leap_time(<span class="kw-2">&</span><span class="self">self</span>) -> i64 {
<span class="self">self</span>.unix_leap_time
}
}
<span class="doccomment">/// ASCII-encoded fixed-capacity string, used for storing time zone names
</span><span class="attr">#[derive(Copy, Clone, Eq, PartialEq)]
</span><span class="kw">struct </span>TimeZoneName {
<span class="doccomment">/// Length-prefixed string buffer
</span>bytes: [u8; <span class="number">8</span>],
}
<span class="kw">impl </span>TimeZoneName {
<span class="doccomment">/// Construct a time zone name
///
/// man tzfile(5):
/// Time zone designations should consist of at least three (3) and no more than six (6) ASCII
/// characters from the set of alphanumerics, “-”, and “+”. This is for compatibility with
/// POSIX requirements for time zone abbreviations.
</span><span class="kw">fn </span>new(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">let </span>len = input.len();
<span class="kw">if </span>!(<span class="number">3</span>..=<span class="number">7</span>).contains(<span class="kw-2">&</span>len) {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::LocalTimeType(
<span class="string">"time zone name must have between 3 and 7 characters"</span>,
));
}
<span class="kw">let </span><span class="kw-2">mut </span>bytes = [<span class="number">0</span>; <span class="number">8</span>];
bytes[<span class="number">0</span>] = input.len() <span class="kw">as </span>u8;
<span class="kw">let </span><span class="kw-2">mut </span>i = <span class="number">0</span>;
<span class="kw">while </span>i < len {
<span class="kw">let </span>b = input[i];
<span class="kw">match </span>b {
<span class="string">b'0'</span>..=<span class="string">b'9' </span>| <span class="string">b'A'</span>..=<span class="string">b'Z' </span>| <span class="string">b'a'</span>..=<span class="string">b'z' </span>| <span class="string">b'+' </span>| <span class="string">b'-' </span>=> {}
<span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(Error::LocalTimeType(<span class="string">"invalid characters in time zone name"</span>)),
}
bytes[i + <span class="number">1</span>] = b;
i += <span class="number">1</span>;
}
<span class="prelude-val">Ok</span>(<span class="self">Self </span>{ bytes })
}
<span class="doccomment">/// Returns time zone name as a byte slice
</span><span class="kw">fn </span>as_bytes(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>[u8] {
<span class="kw">match </span><span class="self">self</span>.bytes[<span class="number">0</span>] {
<span class="number">3 </span>=> <span class="kw-2">&</span><span class="self">self</span>.bytes[<span class="number">1</span>..<span class="number">4</span>],
<span class="number">4 </span>=> <span class="kw-2">&</span><span class="self">self</span>.bytes[<span class="number">1</span>..<span class="number">5</span>],
<span class="number">5 </span>=> <span class="kw-2">&</span><span class="self">self</span>.bytes[<span class="number">1</span>..<span class="number">6</span>],
<span class="number">6 </span>=> <span class="kw-2">&</span><span class="self">self</span>.bytes[<span class="number">1</span>..<span class="number">7</span>],
<span class="number">7 </span>=> <span class="kw-2">&</span><span class="self">self</span>.bytes[<span class="number">1</span>..<span class="number">8</span>],
<span class="kw">_ </span>=> <span class="macro">unreachable!</span>(),
}
}
<span class="doccomment">/// Check if two time zone names are equal
</span><span class="kw">fn </span>equal(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span><span class="self">Self</span>) -> bool {
<span class="self">self</span>.bytes == other.bytes
}
}
<span class="kw">impl </span>AsRef<str> <span class="kw">for </span>TimeZoneName {
<span class="kw">fn </span>as_ref(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>str {
<span class="comment">// SAFETY: ASCII is valid UTF-8
</span><span class="kw">unsafe </span>{ str::from_utf8_unchecked(<span class="self">self</span>.as_bytes()) }
}
}
<span class="kw">impl </span>fmt::Debug <span class="kw">for </span>TimeZoneName {
<span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result {
<span class="self">self</span>.as_ref().fmt(f)
}
}
<span class="doccomment">/// Local time type associated to a time zone
</span><span class="attr">#[derive(Debug, Copy, Clone, Eq, PartialEq)]
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>LocalTimeType {
<span class="doccomment">/// Offset from UTC in seconds
</span><span class="kw">pub</span>(<span class="kw">super</span>) ut_offset: i32,
<span class="doccomment">/// Daylight Saving Time indicator
</span>is_dst: bool,
<span class="doccomment">/// Time zone name
</span>name: <span class="prelude-ty">Option</span><TimeZoneName>,
}
<span class="kw">impl </span>LocalTimeType {
<span class="doccomment">/// Construct a local time type
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(ut_offset: i32, is_dst: bool, name: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>[u8]>) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">if </span>ut_offset == i32::min_value() {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::LocalTimeType(<span class="string">"invalid UTC offset"</span>));
}
<span class="kw">let </span>name = <span class="kw">match </span>name {
<span class="prelude-val">Some</span>(name) => TimeZoneName::new(name)<span class="question-mark">?</span>,
<span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="self">Self </span>{ ut_offset, is_dst, name: <span class="prelude-val">None </span>}),
};
<span class="prelude-val">Ok</span>(<span class="self">Self </span>{ ut_offset, is_dst, name: <span class="prelude-val">Some</span>(name) })
}
<span class="doccomment">/// Construct a local time type with the specified UTC offset in seconds
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">const fn </span>with_offset(ut_offset: i32) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, Error> {
<span class="kw">if </span>ut_offset == i32::min_value() {
<span class="kw">return </span><span class="prelude-val">Err</span>(Error::LocalTimeType(<span class="string">"invalid UTC offset"</span>));
}
<span class="prelude-val">Ok</span>(<span class="self">Self </span>{ ut_offset, is_dst: <span class="bool-val">false</span>, name: <span class="prelude-val">None </span>})
}
<span class="doccomment">/// Returns offset from UTC in seconds
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>offset(<span class="kw-2">&</span><span class="self">self</span>) -> i32 {
<span class="self">self</span>.ut_offset
}
<span class="doccomment">/// Returns daylight saving time indicator
</span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">const fn </span>is_dst(<span class="kw-2">&</span><span class="self">self</span>) -> bool {
<span class="self">self</span>.is_dst
}
<span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">const </span>UTC: LocalTimeType = <span class="self">Self </span>{ ut_offset: <span class="number">0</span>, is_dst: <span class="bool-val">false</span>, name: <span class="prelude-val">None </span>};
}
<span class="doccomment">/// Open the TZif file corresponding to a TZ string
</span><span class="kw">fn </span>find_tz_file(path: <span class="kw">impl </span>AsRef<Path>) -> <span class="prelude-ty">Result</span><File, Error> {
<span class="comment">// Don't check system timezone directories on non-UNIX platforms
</span><span class="attr">#[cfg(not(unix))]
</span><span class="kw">return </span><span class="prelude-val">Ok</span>(File::open(path)<span class="question-mark">?</span>);
<span class="attr">#[cfg(unix)]
</span>{
<span class="kw">let </span>path = path.as_ref();
<span class="kw">if </span>path.is_absolute() {
<span class="kw">return </span><span class="prelude-val">Ok</span>(File::open(path)<span class="question-mark">?</span>);
}
<span class="kw">for </span>folder <span class="kw">in </span><span class="kw-2">&</span>ZONE_INFO_DIRECTORIES {
<span class="kw">if let </span><span class="prelude-val">Ok</span>(file) = File::open(PathBuf::from(folder).join(path)) {
<span class="kw">return </span><span class="prelude-val">Ok</span>(file);
}
}
<span class="prelude-val">Err</span>(Error::Io(io::ErrorKind::NotFound.into()))
}
}
<span class="comment">// Possible system timezone directories
</span><span class="attr">#[cfg(unix)]
</span><span class="kw">const </span>ZONE_INFO_DIRECTORIES: [<span class="kw-2">&</span>str; <span class="number">4</span>] =
[<span class="string">"/usr/share/zoneinfo"</span>, <span class="string">"/share/zoneinfo"</span>, <span class="string">"/etc/zoneinfo"</span>, <span class="string">"/usr/share/lib/zoneinfo"</span>];
<span class="doccomment">/// Number of seconds in one week
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>SECONDS_PER_WEEK: i64 = SECONDS_PER_DAY * DAYS_PER_WEEK;
<span class="doccomment">/// Number of seconds in 28 days
</span><span class="kw">const </span>SECONDS_PER_28_DAYS: i64 = SECONDS_PER_DAY * <span class="number">28</span>;
<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
<span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::Error;
<span class="kw">use super</span>::{LeapSecond, LocalTimeType, TimeZone, TimeZoneName, Transition, TransitionRule};
<span class="attr">#[test]
</span><span class="kw">fn </span>test_no_dst() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>tz_string = <span class="string">b"HST10"</span>;
<span class="kw">let </span>transition_rule = TransitionRule::from_tz_string(tz_string, <span class="bool-val">false</span>)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(transition_rule, LocalTimeType::new(-<span class="number">36000</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"HST"</span>))<span class="question-mark">?</span>.into());
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_error() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="macro">assert!</span>(<span class="macro">matches!</span>(
TransitionRule::from_tz_string(<span class="string">b"IST-1GMT0"</span>, <span class="bool-val">false</span>),
<span class="prelude-val">Err</span>(Error::UnsupportedTzString(<span class="kw">_</span>))
));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(
TransitionRule::from_tz_string(<span class="string">b"EET-2EEST"</span>, <span class="bool-val">false</span>),
<span class="prelude-val">Err</span>(Error::UnsupportedTzString(<span class="kw">_</span>))
));
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_v1_file_with_leap_seconds() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>bytes = <span class="string">b"TZif\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x01\0\0\0\x01\0\0\0\x1b\0\0\0\0\0\0\0\x01\0\0\0\x04\0\0\0\0\0\0UTC\0\x04\xb2\x58\0\0\0\0\x01\x05\xa4\xec\x01\0\0\0\x02\x07\x86\x1f\x82\0\0\0\x03\x09\x67\x53\x03\0\0\0\x04\x0b\x48\x86\x84\0\0\0\x05\x0d\x2b\x0b\x85\0\0\0\x06\x0f\x0c\x3f\x06\0\0\0\x07\x10\xed\x72\x87\0\0\0\x08\x12\xce\xa6\x08\0\0\0\x09\x15\x9f\xca\x89\0\0\0\x0a\x17\x80\xfe\x0a\0\0\0\x0b\x19\x62\x31\x8b\0\0\0\x0c\x1d\x25\xea\x0c\0\0\0\x0d\x21\xda\xe5\x0d\0\0\0\x0e\x25\x9e\x9d\x8e\0\0\0\x0f\x27\x7f\xd1\x0f\0\0\0\x10\x2a\x50\xf5\x90\0\0\0\x11\x2c\x32\x29\x11\0\0\0\x12\x2e\x13\x5c\x92\0\0\0\x13\x30\xe7\x24\x13\0\0\0\x14\x33\xb8\x48\x94\0\0\0\x15\x36\x8c\x10\x15\0\0\0\x16\x43\xb7\x1b\x96\0\0\0\x17\x49\x5c\x07\x97\0\0\0\x18\x4f\xef\x93\x18\0\0\0\x19\x55\x93\x2d\x99\0\0\0\x1a\x58\x68\x46\x9a\0\0\0\x1b\0\0"</span>;
<span class="kw">let </span>time_zone = TimeZone::from_tz_data(bytes)<span class="question-mark">?</span>;
<span class="kw">let </span>time_zone_result = TimeZone::new(
Vec::new(),
<span class="macro">vec!</span>[LocalTimeType::new(<span class="number">0</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"UTC"</span>))<span class="question-mark">?</span>],
<span class="macro">vec!</span>[
LeapSecond::new(<span class="number">78796800</span>, <span class="number">1</span>),
LeapSecond::new(<span class="number">94694401</span>, <span class="number">2</span>),
LeapSecond::new(<span class="number">126230402</span>, <span class="number">3</span>),
LeapSecond::new(<span class="number">157766403</span>, <span class="number">4</span>),
LeapSecond::new(<span class="number">189302404</span>, <span class="number">5</span>),
LeapSecond::new(<span class="number">220924805</span>, <span class="number">6</span>),
LeapSecond::new(<span class="number">252460806</span>, <span class="number">7</span>),
LeapSecond::new(<span class="number">283996807</span>, <span class="number">8</span>),
LeapSecond::new(<span class="number">315532808</span>, <span class="number">9</span>),
LeapSecond::new(<span class="number">362793609</span>, <span class="number">10</span>),
LeapSecond::new(<span class="number">394329610</span>, <span class="number">11</span>),
LeapSecond::new(<span class="number">425865611</span>, <span class="number">12</span>),
LeapSecond::new(<span class="number">489024012</span>, <span class="number">13</span>),
LeapSecond::new(<span class="number">567993613</span>, <span class="number">14</span>),
LeapSecond::new(<span class="number">631152014</span>, <span class="number">15</span>),
LeapSecond::new(<span class="number">662688015</span>, <span class="number">16</span>),
LeapSecond::new(<span class="number">709948816</span>, <span class="number">17</span>),
LeapSecond::new(<span class="number">741484817</span>, <span class="number">18</span>),
LeapSecond::new(<span class="number">773020818</span>, <span class="number">19</span>),
LeapSecond::new(<span class="number">820454419</span>, <span class="number">20</span>),
LeapSecond::new(<span class="number">867715220</span>, <span class="number">21</span>),
LeapSecond::new(<span class="number">915148821</span>, <span class="number">22</span>),
LeapSecond::new(<span class="number">1136073622</span>, <span class="number">23</span>),
LeapSecond::new(<span class="number">1230768023</span>, <span class="number">24</span>),
LeapSecond::new(<span class="number">1341100824</span>, <span class="number">25</span>),
LeapSecond::new(<span class="number">1435708825</span>, <span class="number">26</span>),
LeapSecond::new(<span class="number">1483228826</span>, <span class="number">27</span>),
],
<span class="prelude-val">None</span>,
)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(time_zone, time_zone_result);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_v2_file() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>bytes = <span class="string">b"TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x06\0\0\0\x06\0\0\0\0\0\0\0\x07\0\0\0\x06\0\0\0\x14\x80\0\0\0\xbb\x05\x43\x48\xbb\x21\x71\x58\xcb\x89\x3d\xc8\xd2\x23\xf4\x70\xd2\x61\x49\x38\xd5\x8d\x73\x48\x01\x02\x01\x03\x04\x01\x05\xff\xff\x6c\x02\0\0\xff\xff\x6c\x58\0\x04\xff\xff\x7a\x68\x01\x08\xff\xff\x7a\x68\x01\x0c\xff\xff\x7a\x68\x01\x10\xff\xff\x73\x60\0\x04LMT\0HST\0HDT\0HWT\0HPT\0\0\0\0\0\x01\0\0\0\0\0\x01\0TZif2\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x06\0\0\0\x06\0\0\0\0\0\0\0\x07\0\0\0\x06\0\0\0\x14\xff\xff\xff\xff\x74\xe0\x70\xbe\xff\xff\xff\xff\xbb\x05\x43\x48\xff\xff\xff\xff\xbb\x21\x71\x58\xff\xff\xff\xff\xcb\x89\x3d\xc8\xff\xff\xff\xff\xd2\x23\xf4\x70\xff\xff\xff\xff\xd2\x61\x49\x38\xff\xff\xff\xff\xd5\x8d\x73\x48\x01\x02\x01\x03\x04\x01\x05\xff\xff\x6c\x02\0\0\xff\xff\x6c\x58\0\x04\xff\xff\x7a\x68\x01\x08\xff\xff\x7a\x68\x01\x0c\xff\xff\x7a\x68\x01\x10\xff\xff\x73\x60\0\x04LMT\0HST\0HDT\0HWT\0HPT\0\0\0\0\0\x01\0\0\0\0\0\x01\0\x0aHST10\x0a"</span>;
<span class="kw">let </span>time_zone = TimeZone::from_tz_data(bytes)<span class="question-mark">?</span>;
<span class="kw">let </span>time_zone_result = TimeZone::new(
<span class="macro">vec!</span>[
Transition::new(-<span class="number">2334101314</span>, <span class="number">1</span>),
Transition::new(-<span class="number">1157283000</span>, <span class="number">2</span>),
Transition::new(-<span class="number">1155436200</span>, <span class="number">1</span>),
Transition::new(-<span class="number">880198200</span>, <span class="number">3</span>),
Transition::new(-<span class="number">769395600</span>, <span class="number">4</span>),
Transition::new(-<span class="number">765376200</span>, <span class="number">1</span>),
Transition::new(-<span class="number">712150200</span>, <span class="number">5</span>),
],
<span class="macro">vec!</span>[
LocalTimeType::new(-<span class="number">37886</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"LMT"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">37800</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"HST"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">34200</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"HDT"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">34200</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"HWT"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">34200</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"HPT"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">36000</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"HST"</span>))<span class="question-mark">?</span>,
],
Vec::new(),
<span class="prelude-val">Some</span>(TransitionRule::from(LocalTimeType::new(-<span class="number">36000</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"HST"</span>))<span class="question-mark">?</span>)),
)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(time_zone, time_zone_result);
<span class="macro">assert_eq!</span>(
<span class="kw-2">*</span>time_zone.find_local_time_type(-<span class="number">1156939200</span>)<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">34200</span>, <span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="string">b"HDT"</span>))<span class="question-mark">?
</span>);
<span class="macro">assert_eq!</span>(
<span class="kw-2">*</span>time_zone.find_local_time_type(<span class="number">1546300800</span>)<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">36000</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"HST"</span>))<span class="question-mark">?
</span>);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_no_tz_string() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="comment">// Guayaquil from macOS 10.11
</span><span class="kw">let </span>bytes = <span class="string">b"TZif\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\x02\0\0\0\x02\0\0\0\0\0\0\0\x01\0\0\0\x02\0\0\0\x08\xb6\xa4B\x18\x01\xff\xff\xb6h\0\0\xff\xff\xb9\xb0\0\x04QMT\0ECT\0\0\0\0\0"</span>;
<span class="kw">let </span>time_zone = TimeZone::from_tz_data(bytes)<span class="question-mark">?</span>;
<span class="macro">dbg!</span>(<span class="kw-2">&</span>time_zone);
<span class="kw">let </span>time_zone_result = TimeZone::new(
<span class="macro">vec!</span>[Transition::new(-<span class="number">1230749160</span>, <span class="number">1</span>)],
<span class="macro">vec!</span>[
LocalTimeType::new(-<span class="number">18840</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"QMT"</span>))<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">18000</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"ECT"</span>))<span class="question-mark">?</span>,
],
Vec::new(),
<span class="prelude-val">None</span>,
)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(time_zone, time_zone_result);
<span class="macro">assert_eq!</span>(
<span class="kw-2">*</span>time_zone.find_local_time_type(-<span class="number">1500000000</span>)<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">18840</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"QMT"</span>))<span class="question-mark">?
</span>);
<span class="macro">assert_eq!</span>(
<span class="kw-2">*</span>time_zone.find_local_time_type(<span class="number">0</span>)<span class="question-mark">?</span>,
LocalTimeType::new(-<span class="number">18000</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"ECT"</span>))<span class="question-mark">?
</span>);
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_tz_ascii_str() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="macro">assert!</span>(<span class="macro">matches!</span>(TimeZoneName::new(<span class="string">b""</span>), <span class="prelude-val">Err</span>(Error::LocalTimeType(<span class="kw">_</span>))));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(TimeZoneName::new(<span class="string">b"A"</span>), <span class="prelude-val">Err</span>(Error::LocalTimeType(<span class="kw">_</span>))));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(TimeZoneName::new(<span class="string">b"AB"</span>), <span class="prelude-val">Err</span>(Error::LocalTimeType(<span class="kw">_</span>))));
<span class="macro">assert_eq!</span>(TimeZoneName::new(<span class="string">b"CET"</span>)<span class="question-mark">?</span>.as_bytes(), <span class="string">b"CET"</span>);
<span class="macro">assert_eq!</span>(TimeZoneName::new(<span class="string">b"CHADT"</span>)<span class="question-mark">?</span>.as_bytes(), <span class="string">b"CHADT"</span>);
<span class="macro">assert_eq!</span>(TimeZoneName::new(<span class="string">b"abcdefg"</span>)<span class="question-mark">?</span>.as_bytes(), <span class="string">b"abcdefg"</span>);
<span class="macro">assert_eq!</span>(TimeZoneName::new(<span class="string">b"UTC+02"</span>)<span class="question-mark">?</span>.as_bytes(), <span class="string">b"UTC+02"</span>);
<span class="macro">assert_eq!</span>(TimeZoneName::new(<span class="string">b"-1230"</span>)<span class="question-mark">?</span>.as_bytes(), <span class="string">b"-1230"</span>);
<span class="macro">assert!</span>(<span class="macro">matches!</span>(TimeZoneName::new(<span class="string">"−0330"</span>.as_bytes()), <span class="prelude-val">Err</span>(Error::LocalTimeType(<span class="kw">_</span>)))); <span class="comment">// MINUS SIGN (U+2212)
</span><span class="macro">assert!</span>(<span class="macro">matches!</span>(TimeZoneName::new(<span class="string">b"\x00123"</span>), <span class="prelude-val">Err</span>(Error::LocalTimeType(<span class="kw">_</span>))));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(TimeZoneName::new(<span class="string">b"12345678"</span>), <span class="prelude-val">Err</span>(Error::LocalTimeType(<span class="kw">_</span>))));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(TimeZoneName::new(<span class="string">b"GMT\0\0\0"</span>), <span class="prelude-val">Err</span>(Error::LocalTimeType(<span class="kw">_</span>))));
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_time_zone() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>utc = LocalTimeType::UTC;
<span class="kw">let </span>cet = LocalTimeType::with_offset(<span class="number">3600</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>utc_local_time_types = <span class="macro">vec!</span>[utc];
<span class="kw">let </span>fixed_extra_rule = TransitionRule::from(cet);
<span class="kw">let </span>time_zone_1 = TimeZone::new(<span class="macro">vec!</span>[], utc_local_time_types.clone(), <span class="macro">vec!</span>[], <span class="prelude-val">None</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>time_zone_2 =
TimeZone::new(<span class="macro">vec!</span>[], utc_local_time_types.clone(), <span class="macro">vec!</span>[], <span class="prelude-val">Some</span>(fixed_extra_rule))<span class="question-mark">?</span>;
<span class="kw">let </span>time_zone_3 =
TimeZone::new(<span class="macro">vec!</span>[Transition::new(<span class="number">0</span>, <span class="number">0</span>)], utc_local_time_types.clone(), <span class="macro">vec!</span>[], <span class="prelude-val">None</span>)<span class="question-mark">?</span>;
<span class="kw">let </span>time_zone_4 = TimeZone::new(
<span class="macro">vec!</span>[Transition::new(i32::min_value().into(), <span class="number">0</span>), Transition::new(<span class="number">0</span>, <span class="number">1</span>)],
<span class="macro">vec!</span>[utc, cet],
Vec::new(),
<span class="prelude-val">Some</span>(fixed_extra_rule),
)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>time_zone_1.find_local_time_type(<span class="number">0</span>)<span class="question-mark">?</span>, utc);
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>time_zone_2.find_local_time_type(<span class="number">0</span>)<span class="question-mark">?</span>, cet);
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>time_zone_3.find_local_time_type(-<span class="number">1</span>)<span class="question-mark">?</span>, utc);
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>time_zone_3.find_local_time_type(<span class="number">0</span>)<span class="question-mark">?</span>, utc);
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>time_zone_4.find_local_time_type(-<span class="number">1</span>)<span class="question-mark">?</span>, utc);
<span class="macro">assert_eq!</span>(<span class="kw-2">*</span>time_zone_4.find_local_time_type(<span class="number">0</span>)<span class="question-mark">?</span>, cet);
<span class="kw">let </span>time_zone_err = TimeZone::new(
<span class="macro">vec!</span>[Transition::new(<span class="number">0</span>, <span class="number">0</span>)],
utc_local_time_types,
<span class="macro">vec!</span>[],
<span class="prelude-val">Some</span>(fixed_extra_rule),
);
<span class="macro">assert!</span>(time_zone_err.is_err());
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_time_zone_from_posix_tz() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="attr">#[cfg(unix)]
</span>{
<span class="comment">// if the TZ var is set, this essentially _overrides_ the
// time set by the localtime symlink
// so just ensure that ::local() acts as expected
// in this case
</span><span class="kw">if let </span><span class="prelude-val">Ok</span>(tz) = std::env::var(<span class="string">"TZ"</span>) {
<span class="kw">let </span>time_zone_local = TimeZone::local(<span class="prelude-val">Some</span>(tz.as_str()))<span class="question-mark">?</span>;
<span class="kw">let </span>time_zone_local_1 = TimeZone::from_posix_tz(<span class="kw-2">&</span>tz)<span class="question-mark">?</span>;
<span class="macro">assert_eq!</span>(time_zone_local, time_zone_local_1);
}
<span class="comment">// `TimeZone::from_posix_tz("UTC")` will return `Error` if the environment does not have
// a time zone database, like for example some docker containers.
// In that case skip the test.
</span><span class="kw">if let </span><span class="prelude-val">Ok</span>(time_zone_utc) = TimeZone::from_posix_tz(<span class="string">"UTC"</span>) {
<span class="macro">assert_eq!</span>(time_zone_utc.find_local_time_type(<span class="number">0</span>)<span class="question-mark">?</span>.offset(), <span class="number">0</span>);
}
}
<span class="macro">assert!</span>(TimeZone::from_posix_tz(<span class="string">"EST5EDT,0/0,J365/25"</span>).is_err());
<span class="macro">assert!</span>(TimeZone::from_posix_tz(<span class="string">""</span>).is_err());
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_leap_seconds() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>time_zone = TimeZone::new(
Vec::new(),
<span class="macro">vec!</span>[LocalTimeType::new(<span class="number">0</span>, <span class="bool-val">false</span>, <span class="prelude-val">Some</span>(<span class="string">b"UTC"</span>))<span class="question-mark">?</span>],
<span class="macro">vec!</span>[
LeapSecond::new(<span class="number">78796800</span>, <span class="number">1</span>),
LeapSecond::new(<span class="number">94694401</span>, <span class="number">2</span>),
LeapSecond::new(<span class="number">126230402</span>, <span class="number">3</span>),
LeapSecond::new(<span class="number">157766403</span>, <span class="number">4</span>),
LeapSecond::new(<span class="number">189302404</span>, <span class="number">5</span>),
LeapSecond::new(<span class="number">220924805</span>, <span class="number">6</span>),
LeapSecond::new(<span class="number">252460806</span>, <span class="number">7</span>),
LeapSecond::new(<span class="number">283996807</span>, <span class="number">8</span>),
LeapSecond::new(<span class="number">315532808</span>, <span class="number">9</span>),
LeapSecond::new(<span class="number">362793609</span>, <span class="number">10</span>),
LeapSecond::new(<span class="number">394329610</span>, <span class="number">11</span>),
LeapSecond::new(<span class="number">425865611</span>, <span class="number">12</span>),
LeapSecond::new(<span class="number">489024012</span>, <span class="number">13</span>),
LeapSecond::new(<span class="number">567993613</span>, <span class="number">14</span>),
LeapSecond::new(<span class="number">631152014</span>, <span class="number">15</span>),
LeapSecond::new(<span class="number">662688015</span>, <span class="number">16</span>),
LeapSecond::new(<span class="number">709948816</span>, <span class="number">17</span>),
LeapSecond::new(<span class="number">741484817</span>, <span class="number">18</span>),
LeapSecond::new(<span class="number">773020818</span>, <span class="number">19</span>),
LeapSecond::new(<span class="number">820454419</span>, <span class="number">20</span>),
LeapSecond::new(<span class="number">867715220</span>, <span class="number">21</span>),
LeapSecond::new(<span class="number">915148821</span>, <span class="number">22</span>),
LeapSecond::new(<span class="number">1136073622</span>, <span class="number">23</span>),
LeapSecond::new(<span class="number">1230768023</span>, <span class="number">24</span>),
LeapSecond::new(<span class="number">1341100824</span>, <span class="number">25</span>),
LeapSecond::new(<span class="number">1435708825</span>, <span class="number">26</span>),
LeapSecond::new(<span class="number">1483228826</span>, <span class="number">27</span>),
],
<span class="prelude-val">None</span>,
)<span class="question-mark">?</span>;
<span class="kw">let </span>time_zone_ref = time_zone.as_ref();
<span class="macro">assert!</span>(<span class="macro">matches!</span>(time_zone_ref.unix_leap_time_to_unix_time(<span class="number">1136073621</span>), <span class="prelude-val">Ok</span>(<span class="number">1136073599</span>)));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(time_zone_ref.unix_leap_time_to_unix_time(<span class="number">1136073622</span>), <span class="prelude-val">Ok</span>(<span class="number">1136073600</span>)));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(time_zone_ref.unix_leap_time_to_unix_time(<span class="number">1136073623</span>), <span class="prelude-val">Ok</span>(<span class="number">1136073600</span>)));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(time_zone_ref.unix_leap_time_to_unix_time(<span class="number">1136073624</span>), <span class="prelude-val">Ok</span>(<span class="number">1136073601</span>)));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(time_zone_ref.unix_time_to_unix_leap_time(<span class="number">1136073599</span>), <span class="prelude-val">Ok</span>(<span class="number">1136073621</span>)));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(time_zone_ref.unix_time_to_unix_leap_time(<span class="number">1136073600</span>), <span class="prelude-val">Ok</span>(<span class="number">1136073623</span>)));
<span class="macro">assert!</span>(<span class="macro">matches!</span>(time_zone_ref.unix_time_to_unix_leap_time(<span class="number">1136073601</span>), <span class="prelude-val">Ok</span>(<span class="number">1136073624</span>)));
<span class="prelude-val">Ok</span>(())
}
<span class="attr">#[test]
</span><span class="kw">fn </span>test_leap_seconds_overflow() -> <span class="prelude-ty">Result</span><(), Error> {
<span class="kw">let </span>time_zone_err = TimeZone::new(
<span class="macro">vec!</span>[Transition::new(i64::min_value(), <span class="number">0</span>)],
<span class="macro">vec!</span>[LocalTimeType::UTC],
<span class="macro">vec!</span>[LeapSecond::new(<span class="number">0</span>, <span class="number">1</span>)],
<span class="prelude-val">Some</span>(TransitionRule::from(LocalTimeType::UTC)),
);
<span class="macro">assert!</span>(time_zone_err.is_err());
<span class="kw">let </span>time_zone = TimeZone::new(
<span class="macro">vec!</span>[Transition::new(i64::max_value(), <span class="number">0</span>)],
<span class="macro">vec!</span>[LocalTimeType::UTC],
<span class="macro">vec!</span>[LeapSecond::new(<span class="number">0</span>, <span class="number">1</span>)],
<span class="prelude-val">None</span>,
)<span class="question-mark">?</span>;
<span class="macro">assert!</span>(<span class="macro">matches!</span>(
time_zone.find_local_time_type(i64::max_value()),
<span class="prelude-val">Err</span>(Error::FindLocalTimeType(<span class="kw">_</span>))
));
<span class="prelude-val">Ok</span>(())
}
}
</code></pre></div>
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