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| </pre><pre class="rust"><code><span class="doccomment">//! Rules defined in [ISO 8601]. |
| //! |
| //! [ISO 8601]: https://www.iso.org/iso-8601-date-and-time-format.html |
| |
| </span><span class="kw">use </span>core::num::{NonZeroU16, NonZeroU8}; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::parsing::combinator::{any_digit, ascii_char, exactly_n_digits, first_match, sign}; |
| <span class="kw">use </span><span class="kw">crate</span>::parsing::ParsedItem; |
| <span class="kw">use crate</span>::{Month, Weekday}; |
| |
| <span class="doccomment">/// What kind of format is being parsed. This is used to ensure each part of the format (date, time, |
| /// offset) is the same kind. |
| </span><span class="attribute">#[derive(Debug, Clone, Copy)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>ExtendedKind { |
| <span class="doccomment">/// The basic format. |
| </span>Basic, |
| <span class="doccomment">/// The extended format. |
| </span>Extended, |
| <span class="doccomment">/// ¯\_(ツ)_/¯ |
| </span>Unknown, |
| } |
| |
| <span class="kw">impl </span>ExtendedKind { |
| <span class="doccomment">/// Is it possible that the format is extended? |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>maybe_extended(<span class="self">self</span>) -> bool { |
| <span class="macro">matches!</span>(<span class="self">self</span>, <span class="self">Self</span>::Extended | <span class="self">Self</span>::Unknown) |
| } |
| |
| <span class="doccomment">/// Is the format known for certain to be extended? |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>is_extended(<span class="self">self</span>) -> bool { |
| <span class="macro">matches!</span>(<span class="self">self</span>, <span class="self">Self</span>::Extended) |
| } |
| |
| <span class="doccomment">/// If the kind is `Unknown`, make it `Basic`. Otherwise, do nothing. Returns `Some` if and only |
| /// if the kind is now `Basic`. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>coerce_basic(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><()> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="self">Self</span>::Basic => <span class="prelude-val">Some</span>(()), |
| <span class="self">Self</span>::Extended => <span class="prelude-val">None</span>, |
| <span class="self">Self</span>::Unknown => { |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="self">Self</span>::Basic; |
| <span class="prelude-val">Some</span>(()) |
| } |
| } |
| } |
| |
| <span class="doccomment">/// If the kind is `Unknown`, make it `Extended`. Otherwise, do nothing. Returns `Some` if and |
| /// only if the kind is now `Extended`. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>coerce_extended(<span class="kw-2">&mut </span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><()> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="self">Self</span>::Basic => <span class="prelude-val">None</span>, |
| <span class="self">Self</span>::Extended => <span class="prelude-val">Some</span>(()), |
| <span class="self">Self</span>::Unknown => { |
| <span class="kw-2">*</span><span class="self">self </span>= <span class="self">Self</span>::Extended; |
| <span class="prelude-val">Some</span>(()) |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Parse a possibly expanded year. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>year(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, i32>> { |
| <span class="prelude-val">Some</span>(<span class="kw">match </span>sign(input) { |
| <span class="prelude-val">Some</span>(ParsedItem(input, sign)) => exactly_n_digits::<<span class="number">6</span>, u32>(input)<span class="question-mark">?</span>.map(|val| { |
| <span class="kw">let </span>val = val <span class="kw">as </span>i32; |
| <span class="kw">if </span>sign == <span class="string">b'-' </span>{ -val } <span class="kw">else </span>{ val } |
| }), |
| <span class="prelude-val">None </span>=> exactly_n_digits::<<span class="number">4</span>, u32>(input)<span class="question-mark">?</span>.map(|val| val <span class="kw">as _</span>), |
| }) |
| } |
| |
| <span class="doccomment">/// Parse a month. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>month(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, Month>> { |
| first_match( |
| [ |
| (<span class="string">b"01"</span>.as_slice(), Month::January), |
| (<span class="string">b"02"</span>.as_slice(), Month::February), |
| (<span class="string">b"03"</span>.as_slice(), Month::March), |
| (<span class="string">b"04"</span>.as_slice(), Month::April), |
| (<span class="string">b"05"</span>.as_slice(), Month::May), |
| (<span class="string">b"06"</span>.as_slice(), Month::June), |
| (<span class="string">b"07"</span>.as_slice(), Month::July), |
| (<span class="string">b"08"</span>.as_slice(), Month::August), |
| (<span class="string">b"09"</span>.as_slice(), Month::September), |
| (<span class="string">b"10"</span>.as_slice(), Month::October), |
| (<span class="string">b"11"</span>.as_slice(), Month::November), |
| (<span class="string">b"12"</span>.as_slice(), Month::December), |
| ], |
| <span class="bool-val">true</span>, |
| )(input) |
| } |
| |
| <span class="doccomment">/// Parse a week number. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>week(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, NonZeroU8>> { |
| exactly_n_digits::<<span class="number">2</span>, <span class="kw">_</span>>(input) |
| } |
| |
| <span class="doccomment">/// Parse a day of the month. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>day(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, NonZeroU8>> { |
| exactly_n_digits::<<span class="number">2</span>, <span class="kw">_</span>>(input) |
| } |
| |
| <span class="doccomment">/// Parse a day of the week. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>dayk(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, Weekday>> { |
| first_match( |
| [ |
| (<span class="string">b"1"</span>.as_slice(), Weekday::Monday), |
| (<span class="string">b"2"</span>.as_slice(), Weekday::Tuesday), |
| (<span class="string">b"3"</span>.as_slice(), Weekday::Wednesday), |
| (<span class="string">b"4"</span>.as_slice(), Weekday::Thursday), |
| (<span class="string">b"5"</span>.as_slice(), Weekday::Friday), |
| (<span class="string">b"6"</span>.as_slice(), Weekday::Saturday), |
| (<span class="string">b"7"</span>.as_slice(), Weekday::Sunday), |
| ], |
| <span class="bool-val">true</span>, |
| )(input) |
| } |
| |
| <span class="doccomment">/// Parse a day of the year. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>dayo(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, NonZeroU16>> { |
| exactly_n_digits::<<span class="number">3</span>, <span class="kw">_</span>>(input) |
| } |
| |
| <span class="doccomment">/// Parse the hour. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>hour(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, u8>> { |
| exactly_n_digits::<<span class="number">2</span>, <span class="kw">_</span>>(input) |
| } |
| |
| <span class="doccomment">/// Parse the minute. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>min(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, u8>> { |
| exactly_n_digits::<<span class="number">2</span>, <span class="kw">_</span>>(input) |
| } |
| |
| <span class="doccomment">/// Parse a floating point number as its integer and optional fractional parts. |
| /// |
| /// The number must have two digits before the decimal point. If a decimal point is present, at |
| /// least one digit must follow. |
| /// |
| /// The return type is a tuple of the integer part and optional fraction part. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>float(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, (u8, <span class="prelude-ty">Option</span><f64>)>> { |
| <span class="comment">// Two digits before the decimal. |
| </span><span class="kw">let </span>ParsedItem(input, integer_part) = <span class="kw">match </span>input { |
| [ |
| first_digit @ <span class="string">b'0'</span>..=<span class="string">b'9'</span>, |
| second_digit @ <span class="string">b'0'</span>..=<span class="string">b'9'</span>, |
| input @ .., |
| ] => ParsedItem(input, (first_digit - <span class="string">b'0'</span>) * <span class="number">10 </span>+ (second_digit - <span class="string">b'0'</span>)), |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(ParsedItem(input, ())) = decimal_sign(input) { |
| <span class="comment">// Mandatory post-decimal digit. |
| </span><span class="kw">let </span>ParsedItem(<span class="kw-2">mut </span>input, <span class="kw-2">mut </span>fractional_part) = |
| any_digit(input)<span class="question-mark">?</span>.map(|digit| ((digit - <span class="string">b'0'</span>) <span class="kw">as </span>f64) / <span class="number">10.</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>divisor = <span class="number">10.</span>; |
| <span class="comment">// Any number of subsequent digits. |
| </span><span class="kw">while let </span><span class="prelude-val">Some</span>(ParsedItem(new_input, digit)) = any_digit(input) { |
| input = new_input; |
| divisor <span class="kw-2">*</span>= <span class="number">10.</span>; |
| fractional_part += (digit - <span class="string">b'0'</span>) <span class="kw">as </span>f64 / divisor; |
| } |
| |
| <span class="prelude-val">Some</span>(ParsedItem(input, (integer_part, <span class="prelude-val">Some</span>(fractional_part)))) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(ParsedItem(input, (integer_part, <span class="prelude-val">None</span>))) |
| } |
| } |
| |
| <span class="doccomment">/// Parse a "decimal sign", which is either a comma or a period. |
| </span><span class="kw">fn </span>decimal_sign(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, ()>> { |
| ascii_char::<<span class="string">b'.'</span>>(input).or_else(|| ascii_char::<<span class="string">b','</span>>(input)) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../../" data-current-crate="time" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
