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</pre><pre class="rust"><code><span class="doccomment">//! The `Month` enum and its associated `impl`s.
</span><span class="kw">use </span>core::fmt;
<span class="kw">use </span>core::num::NonZeroU8;
<span class="kw">use </span>core::str::FromStr;
<span class="kw">use </span><span class="self">self</span>::Month::<span class="kw-2">*</span>;
<span class="kw">use </span><span class="kw">crate</span>::error;
<span class="doccomment">/// Months of the year.
</span><span class="attribute">#[allow(clippy::missing_docs_in_private_items)] </span><span class="comment">// variants
</span><span class="attribute">#[repr(u8)]
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
</span><span class="kw">pub enum </span>Month {
January = <span class="number">1</span>,
February = <span class="number">2</span>,
March = <span class="number">3</span>,
April = <span class="number">4</span>,
May = <span class="number">5</span>,
June = <span class="number">6</span>,
July = <span class="number">7</span>,
August = <span class="number">8</span>,
September = <span class="number">9</span>,
October = <span class="number">10</span>,
November = <span class="number">11</span>,
December = <span class="number">12</span>,
}
<span class="kw">impl </span>Month {
<span class="doccomment">/// Create a `Month` from its numerical value.
</span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>from_number(n: NonZeroU8) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, error::ComponentRange&gt; {
<span class="kw">match </span>n.get() {
<span class="number">1 </span>=&gt; <span class="prelude-val">Ok</span>(January),
<span class="number">2 </span>=&gt; <span class="prelude-val">Ok</span>(February),
<span class="number">3 </span>=&gt; <span class="prelude-val">Ok</span>(March),
<span class="number">4 </span>=&gt; <span class="prelude-val">Ok</span>(April),
<span class="number">5 </span>=&gt; <span class="prelude-val">Ok</span>(May),
<span class="number">6 </span>=&gt; <span class="prelude-val">Ok</span>(June),
<span class="number">7 </span>=&gt; <span class="prelude-val">Ok</span>(July),
<span class="number">8 </span>=&gt; <span class="prelude-val">Ok</span>(August),
<span class="number">9 </span>=&gt; <span class="prelude-val">Ok</span>(September),
<span class="number">10 </span>=&gt; <span class="prelude-val">Ok</span>(October),
<span class="number">11 </span>=&gt; <span class="prelude-val">Ok</span>(November),
<span class="number">12 </span>=&gt; <span class="prelude-val">Ok</span>(December),
n =&gt; <span class="prelude-val">Err</span>(error::ComponentRange {
name: <span class="string">&quot;month&quot;</span>,
minimum: <span class="number">1</span>,
maximum: <span class="number">12</span>,
value: n <span class="kw">as _</span>,
conditional_range: <span class="bool-val">false</span>,
}),
}
}
<span class="doccomment">/// Get the previous month.
///
/// ```rust
/// # use time::Month;
/// assert_eq!(Month::January.previous(), Month::December);
/// ```
</span><span class="kw">pub const fn </span>previous(<span class="self">self</span>) -&gt; <span class="self">Self </span>{
<span class="kw">match </span><span class="self">self </span>{
January =&gt; December,
February =&gt; January,
March =&gt; February,
April =&gt; March,
May =&gt; April,
June =&gt; May,
July =&gt; June,
August =&gt; July,
September =&gt; August,
October =&gt; September,
November =&gt; October,
December =&gt; November,
}
}
<span class="doccomment">/// Get the next month.
///
/// ```rust
/// # use time::Month;
/// assert_eq!(Month::January.next(), Month::February);
/// ```
</span><span class="kw">pub const fn </span>next(<span class="self">self</span>) -&gt; <span class="self">Self </span>{
<span class="kw">match </span><span class="self">self </span>{
January =&gt; February,
February =&gt; March,
March =&gt; April,
April =&gt; May,
May =&gt; June,
June =&gt; July,
July =&gt; August,
August =&gt; September,
September =&gt; October,
October =&gt; November,
November =&gt; December,
December =&gt; January,
}
}
}
<span class="kw">impl </span>fmt::Display <span class="kw">for </span>Month {
<span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">&#39;_</span>&gt;) -&gt; fmt::Result {
f.write_str(<span class="kw">match </span><span class="self">self </span>{
January =&gt; <span class="string">&quot;January&quot;</span>,
February =&gt; <span class="string">&quot;February&quot;</span>,
March =&gt; <span class="string">&quot;March&quot;</span>,
April =&gt; <span class="string">&quot;April&quot;</span>,
May =&gt; <span class="string">&quot;May&quot;</span>,
June =&gt; <span class="string">&quot;June&quot;</span>,
July =&gt; <span class="string">&quot;July&quot;</span>,
August =&gt; <span class="string">&quot;August&quot;</span>,
September =&gt; <span class="string">&quot;September&quot;</span>,
October =&gt; <span class="string">&quot;October&quot;</span>,
November =&gt; <span class="string">&quot;November&quot;</span>,
December =&gt; <span class="string">&quot;December&quot;</span>,
})
}
}
<span class="kw">impl </span>FromStr <span class="kw">for </span>Month {
<span class="kw">type </span><span class="prelude-val">Err </span>= error::InvalidVariant;
<span class="kw">fn </span>from_str(s: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Err&gt; {
<span class="kw">match </span>s {
<span class="string">&quot;January&quot; </span>=&gt; <span class="prelude-val">Ok</span>(January),
<span class="string">&quot;February&quot; </span>=&gt; <span class="prelude-val">Ok</span>(February),
<span class="string">&quot;March&quot; </span>=&gt; <span class="prelude-val">Ok</span>(March),
<span class="string">&quot;April&quot; </span>=&gt; <span class="prelude-val">Ok</span>(April),
<span class="string">&quot;May&quot; </span>=&gt; <span class="prelude-val">Ok</span>(May),
<span class="string">&quot;June&quot; </span>=&gt; <span class="prelude-val">Ok</span>(June),
<span class="string">&quot;July&quot; </span>=&gt; <span class="prelude-val">Ok</span>(July),
<span class="string">&quot;August&quot; </span>=&gt; <span class="prelude-val">Ok</span>(August),
<span class="string">&quot;September&quot; </span>=&gt; <span class="prelude-val">Ok</span>(September),
<span class="string">&quot;October&quot; </span>=&gt; <span class="prelude-val">Ok</span>(October),
<span class="string">&quot;November&quot; </span>=&gt; <span class="prelude-val">Ok</span>(November),
<span class="string">&quot;December&quot; </span>=&gt; <span class="prelude-val">Ok</span>(December),
<span class="kw">_ </span>=&gt; <span class="prelude-val">Err</span>(error::InvalidVariant),
}
}
}
<span class="kw">impl </span>From&lt;Month&gt; <span class="kw">for </span>u8 {
<span class="kw">fn </span>from(month: Month) -&gt; <span class="self">Self </span>{
month <span class="kw">as _
</span>}
}
<span class="kw">impl </span>TryFrom&lt;u8&gt; <span class="kw">for </span>Month {
<span class="kw">type </span>Error = error::ComponentRange;
<span class="kw">fn </span>try_from(value: u8) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
<span class="kw">match </span>NonZeroU8::new(value) {
<span class="prelude-val">Some</span>(value) =&gt; <span class="self">Self</span>::from_number(value),
<span class="prelude-val">None </span>=&gt; <span class="prelude-val">Err</span>(error::ComponentRange {
name: <span class="string">&quot;month&quot;</span>,
minimum: <span class="number">1</span>,
maximum: <span class="number">12</span>,
value: <span class="number">0</span>,
conditional_range: <span class="bool-val">false</span>,
}),
}
}
}
</code></pre></div>
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