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| </pre><pre class="rust"><code><span class="doccomment">//! A trait that can be used to format an item from its components. |
| |
| </span><span class="kw">use </span>core::ops::Deref; |
| <span class="kw">use </span>std::io; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::format_description::well_known::iso8601::EncodedConfig; |
| <span class="kw">use </span><span class="kw">crate</span>::format_description::well_known::{Iso8601, Rfc2822, Rfc3339}; |
| <span class="kw">use </span><span class="kw">crate</span>::format_description::{FormatItem, OwnedFormatItem}; |
| <span class="kw">use </span><span class="kw">crate</span>::formatting::{ |
| format_component, format_number_pad_zero, iso8601, write, MONTH_NAMES, WEEKDAY_NAMES, |
| }; |
| <span class="kw">use crate</span>::{error, Date, Time, UtcOffset}; |
| |
| <span class="doccomment">/// A type that describes a format. |
| /// |
| /// Implementors of [`Formattable`] are [format descriptions](crate::format_description). |
| /// |
| /// [`Date::format`] and [`Time::format`] each use a format description to generate |
| /// a String from their data. See the respective methods for usage examples. |
| </span><span class="attribute">#[cfg_attr(__time_03_docs, doc(notable_trait))] |
| </span><span class="kw">pub trait </span>Formattable: sealed::Sealed {} |
| <span class="kw">impl </span>Formattable <span class="kw">for </span>FormatItem<<span class="lifetime">'_</span>> {} |
| <span class="kw">impl </span>Formattable <span class="kw">for </span>[FormatItem<<span class="lifetime">'_</span>>] {} |
| <span class="kw">impl </span>Formattable <span class="kw">for </span>OwnedFormatItem {} |
| <span class="kw">impl </span>Formattable <span class="kw">for </span>[OwnedFormatItem] {} |
| <span class="kw">impl </span>Formattable <span class="kw">for </span>Rfc3339 {} |
| <span class="kw">impl </span>Formattable <span class="kw">for </span>Rfc2822 {} |
| <span class="kw">impl</span><<span class="kw">const </span>CONFIG: EncodedConfig> Formattable <span class="kw">for </span>Iso8601<CONFIG> {} |
| <span class="kw">impl</span><T: Deref> Formattable <span class="kw">for </span>T <span class="kw">where </span>T::Target: Formattable {} |
| |
| <span class="doccomment">/// Seal the trait to prevent downstream users from implementing it. |
| </span><span class="kw">mod </span>sealed { |
| <span class="attribute">#[allow(clippy::wildcard_imports)] |
| </span><span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// Format the item using a format description, the intended output, and the various components. |
| </span><span class="kw">pub trait </span>Sealed { |
| <span class="doccomment">/// Format the item into the provided output, returning the number of bytes written. |
| </span><span class="kw">fn </span>format_into( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| output: <span class="kw-2">&mut </span><span class="kw">impl </span>io::Write, |
| date: <span class="prelude-ty">Option</span><Date>, |
| time: <span class="prelude-ty">Option</span><Time>, |
| offset: <span class="prelude-ty">Option</span><UtcOffset>, |
| ) -> <span class="prelude-ty">Result</span><usize, error::Format>; |
| |
| <span class="doccomment">/// Format the item directly to a `String`. |
| </span><span class="kw">fn </span>format( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| date: <span class="prelude-ty">Option</span><Date>, |
| time: <span class="prelude-ty">Option</span><Time>, |
| offset: <span class="prelude-ty">Option</span><UtcOffset>, |
| ) -> <span class="prelude-ty">Result</span><String, error::Format> { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = Vec::new(); |
| <span class="self">self</span>.format_into(<span class="kw-2">&mut </span>buf, date, time, offset)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(String::from_utf8_lossy(<span class="kw-2">&</span>buf).into_owned()) |
| } |
| } |
| } |
| |
| <span class="comment">// region: custom formats |
| </span><span class="kw">impl</span><<span class="lifetime">'a</span>> sealed::Sealed <span class="kw">for </span>FormatItem<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>format_into( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| output: <span class="kw-2">&mut </span><span class="kw">impl </span>io::Write, |
| date: <span class="prelude-ty">Option</span><Date>, |
| time: <span class="prelude-ty">Option</span><Time>, |
| offset: <span class="prelude-ty">Option</span><UtcOffset>, |
| ) -> <span class="prelude-ty">Result</span><usize, error::Format> { |
| <span class="prelude-val">Ok</span>(<span class="kw">match </span><span class="kw-2">*</span><span class="self">self </span>{ |
| <span class="self">Self</span>::Literal(literal) => write(output, literal)<span class="question-mark">?</span>, |
| <span class="self">Self</span>::Component(component) => format_component(output, component, date, time, offset)<span class="question-mark">?</span>, |
| <span class="self">Self</span>::Compound(items) => items.format_into(output, date, time, offset)<span class="question-mark">?</span>, |
| <span class="self">Self</span>::Optional(item) => item.format_into(output, date, time, offset)<span class="question-mark">?</span>, |
| <span class="self">Self</span>::First(items) => <span class="kw">match </span>items { |
| [] => <span class="number">0</span>, |
| [item, ..] => item.format_into(output, date, time, offset)<span class="question-mark">?</span>, |
| }, |
| }) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> sealed::Sealed <span class="kw">for </span>[FormatItem<<span class="lifetime">'a</span>>] { |
| <span class="kw">fn </span>format_into( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| output: <span class="kw-2">&mut </span><span class="kw">impl </span>io::Write, |
| date: <span class="prelude-ty">Option</span><Date>, |
| time: <span class="prelude-ty">Option</span><Time>, |
| offset: <span class="prelude-ty">Option</span><UtcOffset>, |
| ) -> <span class="prelude-ty">Result</span><usize, error::Format> { |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = <span class="number">0</span>; |
| <span class="kw">for </span>item <span class="kw">in </span><span class="self">self</span>.iter() { |
| bytes += item.format_into(output, date, time, offset)<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(bytes) |
| } |
| } |
| |
| <span class="kw">impl </span>sealed::Sealed <span class="kw">for </span>OwnedFormatItem { |
| <span class="kw">fn </span>format_into( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| output: <span class="kw-2">&mut </span><span class="kw">impl </span>io::Write, |
| date: <span class="prelude-ty">Option</span><Date>, |
| time: <span class="prelude-ty">Option</span><Time>, |
| offset: <span class="prelude-ty">Option</span><UtcOffset>, |
| ) -> <span class="prelude-ty">Result</span><usize, error::Format> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="self">Self</span>::Literal(literal) => <span class="prelude-val">Ok</span>(write(output, literal)<span class="question-mark">?</span>), |
| <span class="self">Self</span>::Component(component) => format_component(output, <span class="kw-2">*</span>component, date, time, offset), |
| <span class="self">Self</span>::Compound(items) => items.format_into(output, date, time, offset), |
| <span class="self">Self</span>::Optional(item) => item.format_into(output, date, time, offset), |
| <span class="self">Self</span>::First(items) => <span class="kw">match </span><span class="kw-2">&**</span>items { |
| [] => <span class="prelude-val">Ok</span>(<span class="number">0</span>), |
| [item, ..] => item.format_into(output, date, time, offset), |
| }, |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>sealed::Sealed <span class="kw">for </span>[OwnedFormatItem] { |
| <span class="kw">fn </span>format_into( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| output: <span class="kw-2">&mut </span><span class="kw">impl </span>io::Write, |
| date: <span class="prelude-ty">Option</span><Date>, |
| time: <span class="prelude-ty">Option</span><Time>, |
| offset: <span class="prelude-ty">Option</span><UtcOffset>, |
| ) -> <span class="prelude-ty">Result</span><usize, error::Format> { |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = <span class="number">0</span>; |
| <span class="kw">for </span>item <span class="kw">in </span><span class="self">self</span>.iter() { |
| bytes += item.format_into(output, date, time, offset)<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(bytes) |
| } |
| } |
| |
| <span class="kw">impl</span><T: Deref> sealed::Sealed <span class="kw">for </span>T |
| <span class="kw">where |
| </span>T::Target: sealed::Sealed, |
| { |
| <span class="kw">fn </span>format_into( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| output: <span class="kw-2">&mut </span><span class="kw">impl </span>io::Write, |
| date: <span class="prelude-ty">Option</span><Date>, |
| time: <span class="prelude-ty">Option</span><Time>, |
| offset: <span class="prelude-ty">Option</span><UtcOffset>, |
| ) -> <span class="prelude-ty">Result</span><usize, error::Format> { |
| <span class="self">self</span>.deref().format_into(output, date, time, offset) |
| } |
| } |
| <span class="comment">// endregion custom formats |
| |
| // region: well-known formats |
| </span><span class="kw">impl </span>sealed::Sealed <span class="kw">for </span>Rfc2822 { |
| <span class="kw">fn </span>format_into( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| output: <span class="kw-2">&mut </span><span class="kw">impl </span>io::Write, |
| date: <span class="prelude-ty">Option</span><Date>, |
| time: <span class="prelude-ty">Option</span><Time>, |
| offset: <span class="prelude-ty">Option</span><UtcOffset>, |
| ) -> <span class="prelude-ty">Result</span><usize, error::Format> { |
| <span class="kw">let </span>date = date.ok_or(error::Format::InsufficientTypeInformation)<span class="question-mark">?</span>; |
| <span class="kw">let </span>time = time.ok_or(error::Format::InsufficientTypeInformation)<span class="question-mark">?</span>; |
| <span class="kw">let </span>offset = offset.ok_or(error::Format::InsufficientTypeInformation)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = <span class="number">0</span>; |
| |
| <span class="kw">let </span>(year, month, day) = date.to_calendar_date(); |
| |
| <span class="kw">if </span>year < <span class="number">1900 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(error::Format::InvalidComponent(<span class="string">"year"</span>)); |
| } |
| <span class="kw">if </span>offset.seconds_past_minute() != <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(error::Format::InvalidComponent(<span class="string">"offset_second"</span>)); |
| } |
| |
| bytes += write( |
| output, |
| <span class="kw-2">&</span>WEEKDAY_NAMES[date.weekday().number_days_from_monday() <span class="kw">as </span>usize][..<span class="number">3</span>], |
| )<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b", "</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, day)<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b" "</span>)<span class="question-mark">?</span>; |
| bytes += write(output, <span class="kw-2">&</span>MONTH_NAMES[month <span class="kw">as </span>usize - <span class="number">1</span>][..<span class="number">3</span>])<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b" "</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">4</span>>(output, year <span class="kw">as </span>u32)<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b" "</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, time.hour())<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b":"</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, time.minute())<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b":"</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, time.second())<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b" "</span>)<span class="question-mark">?</span>; |
| bytes += write(output, <span class="kw">if </span>offset.is_negative() { <span class="string">b"-" </span>} <span class="kw">else </span>{ <span class="string">b"+" </span>})<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, offset.whole_hours().unsigned_abs())<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, offset.minutes_past_hour().unsigned_abs())<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(bytes) |
| } |
| } |
| |
| <span class="kw">impl </span>sealed::Sealed <span class="kw">for </span>Rfc3339 { |
| <span class="kw">fn </span>format_into( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| output: <span class="kw-2">&mut </span><span class="kw">impl </span>io::Write, |
| date: <span class="prelude-ty">Option</span><Date>, |
| time: <span class="prelude-ty">Option</span><Time>, |
| offset: <span class="prelude-ty">Option</span><UtcOffset>, |
| ) -> <span class="prelude-ty">Result</span><usize, error::Format> { |
| <span class="kw">let </span>date = date.ok_or(error::Format::InsufficientTypeInformation)<span class="question-mark">?</span>; |
| <span class="kw">let </span>time = time.ok_or(error::Format::InsufficientTypeInformation)<span class="question-mark">?</span>; |
| <span class="kw">let </span>offset = offset.ok_or(error::Format::InsufficientTypeInformation)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = <span class="number">0</span>; |
| |
| <span class="kw">let </span>year = date.year(); |
| |
| <span class="kw">if </span>!(<span class="number">0</span>..<span class="number">10_000</span>).contains(<span class="kw-2">&</span>year) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(error::Format::InvalidComponent(<span class="string">"year"</span>)); |
| } |
| <span class="kw">if </span>offset.seconds_past_minute() != <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(error::Format::InvalidComponent(<span class="string">"offset_second"</span>)); |
| } |
| |
| bytes += format_number_pad_zero::<<span class="number">4</span>>(output, year <span class="kw">as </span>u32)<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b"-"</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, date.month() <span class="kw">as </span>u8)<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b"-"</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, date.day())<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b"T"</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, time.hour())<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b":"</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, time.minute())<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b":"</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, time.second())<span class="question-mark">?</span>; |
| |
| <span class="attribute">#[allow(clippy::if_not_else)] |
| </span><span class="kw">if </span>time.nanosecond() != <span class="number">0 </span>{ |
| <span class="kw">let </span>nanos = time.nanosecond(); |
| bytes += write(output, <span class="string">b"."</span>)<span class="question-mark">?</span>; |
| bytes += <span class="kw">if </span>nanos % <span class="number">10 </span>!= <span class="number">0 </span>{ |
| format_number_pad_zero::<<span class="number">9</span>>(output, nanos) |
| } <span class="kw">else if </span>(nanos / <span class="number">10</span>) % <span class="number">10 </span>!= <span class="number">0 </span>{ |
| format_number_pad_zero::<<span class="number">8</span>>(output, nanos / <span class="number">10</span>) |
| } <span class="kw">else if </span>(nanos / <span class="number">100</span>) % <span class="number">10 </span>!= <span class="number">0 </span>{ |
| format_number_pad_zero::<<span class="number">7</span>>(output, nanos / <span class="number">100</span>) |
| } <span class="kw">else if </span>(nanos / <span class="number">1_000</span>) % <span class="number">10 </span>!= <span class="number">0 </span>{ |
| format_number_pad_zero::<<span class="number">6</span>>(output, nanos / <span class="number">1_000</span>) |
| } <span class="kw">else if </span>(nanos / <span class="number">10_000</span>) % <span class="number">10 </span>!= <span class="number">0 </span>{ |
| format_number_pad_zero::<<span class="number">5</span>>(output, nanos / <span class="number">10_000</span>) |
| } <span class="kw">else if </span>(nanos / <span class="number">100_000</span>) % <span class="number">10 </span>!= <span class="number">0 </span>{ |
| format_number_pad_zero::<<span class="number">4</span>>(output, nanos / <span class="number">100_000</span>) |
| } <span class="kw">else if </span>(nanos / <span class="number">1_000_000</span>) % <span class="number">10 </span>!= <span class="number">0 </span>{ |
| format_number_pad_zero::<<span class="number">3</span>>(output, nanos / <span class="number">1_000_000</span>) |
| } <span class="kw">else if </span>(nanos / <span class="number">10_000_000</span>) % <span class="number">10 </span>!= <span class="number">0 </span>{ |
| format_number_pad_zero::<<span class="number">2</span>>(output, nanos / <span class="number">10_000_000</span>) |
| } <span class="kw">else </span>{ |
| format_number_pad_zero::<<span class="number">1</span>>(output, nanos / <span class="number">100_000_000</span>) |
| }<span class="question-mark">?</span>; |
| } |
| |
| <span class="kw">if </span>offset == UtcOffset::UTC { |
| bytes += write(output, <span class="string">b"Z"</span>)<span class="question-mark">?</span>; |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(bytes); |
| } |
| |
| bytes += write(output, <span class="kw">if </span>offset.is_negative() { <span class="string">b"-" </span>} <span class="kw">else </span>{ <span class="string">b"+" </span>})<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, offset.whole_hours().unsigned_abs())<span class="question-mark">?</span>; |
| bytes += write(output, <span class="string">b":"</span>)<span class="question-mark">?</span>; |
| bytes += format_number_pad_zero::<<span class="number">2</span>>(output, offset.minutes_past_hour().unsigned_abs())<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>(bytes) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="kw">const </span>CONFIG: EncodedConfig> sealed::Sealed <span class="kw">for </span>Iso8601<CONFIG> { |
| <span class="kw">fn </span>format_into( |
| <span class="kw-2">&</span><span class="self">self</span>, |
| output: <span class="kw-2">&mut </span><span class="kw">impl </span>io::Write, |
| date: <span class="prelude-ty">Option</span><Date>, |
| time: <span class="prelude-ty">Option</span><Time>, |
| offset: <span class="prelude-ty">Option</span><UtcOffset>, |
| ) -> <span class="prelude-ty">Result</span><usize, error::Format> { |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = <span class="number">0</span>; |
| |
| <span class="kw">if </span><span class="self">Self</span>::FORMAT_DATE { |
| <span class="kw">let </span>date = date.ok_or(error::Format::InsufficientTypeInformation)<span class="question-mark">?</span>; |
| bytes += iso8601::format_date::<CONFIG>(output, date)<span class="question-mark">?</span>; |
| } |
| <span class="kw">if </span><span class="self">Self</span>::FORMAT_TIME { |
| <span class="kw">let </span>time = time.ok_or(error::Format::InsufficientTypeInformation)<span class="question-mark">?</span>; |
| bytes += iso8601::format_time::<CONFIG>(output, time)<span class="question-mark">?</span>; |
| } |
| <span class="kw">if </span><span class="self">Self</span>::FORMAT_OFFSET { |
| <span class="kw">let </span>offset = offset.ok_or(error::Format::InsufficientTypeInformation)<span class="question-mark">?</span>; |
| bytes += iso8601::format_offset::<CONFIG>(output, offset)<span class="question-mark">?</span>; |
| } |
| |
| <span class="kw">if </span>bytes == <span class="number">0 </span>{ |
| <span class="comment">// The only reason there would be no bytes written is if the format was only for |
| // parsing. |
| </span><span class="macro">panic!</span>(<span class="string">"attempted to format a parsing-only format description"</span>); |
| } |
| |
| <span class="prelude-val">Ok</span>(bytes) |
| } |
| } |
| <span class="comment">// endregion well-known formats |
| </span></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> |