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| </pre><pre class="rust"><code><span class="doccomment">//! Hackery to work around not being able to use ADTs in const generics on stable. |
| |
| </span><span class="kw">use </span>core::num::NonZeroU8; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"formatting"</span>)] |
| </span><span class="kw">use </span><span class="kw">super</span>::Iso8601; |
| <span class="kw">use super</span>::{Config, DateKind, FormattedComponents <span class="kw">as </span>FC, OffsetPrecision, TimePrecision}; |
| |
| <span class="comment">// This provides a way to include `EncodedConfig` in documentation without displaying the type it is |
| // aliased to. |
| </span><span class="attribute">#[doc(hidden)] |
| </span><span class="kw">pub type </span>DoNotRelyOnWhatThisIs = u128; |
| |
| <span class="doccomment">/// An encoded [`Config`] that can be used as a const parameter to [`Iso8601`](super::Iso8601). |
| /// |
| /// The type this is aliased to must not be relied upon. It can change in any release without |
| /// notice. |
| </span><span class="kw">pub type </span>EncodedConfig = DoNotRelyOnWhatThisIs; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"formatting"</span>)] |
| </span><span class="kw">impl</span><<span class="kw">const </span>CONFIG: EncodedConfig> Iso8601<CONFIG> { |
| <span class="doccomment">/// The user-provided configuration for the ISO 8601 format. |
| </span><span class="kw">const </span>CONFIG: Config = Config::decode(CONFIG); |
| <span class="doccomment">/// Whether the date should be formatted. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>FORMAT_DATE: bool = <span class="macro">matches!</span>( |
| <span class="self">Self</span>::CONFIG.formatted_components, |
| FC::Date | FC::DateTime | FC::DateTimeOffset |
| ); |
| <span class="doccomment">/// Whether the time should be formatted. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>FORMAT_TIME: bool = <span class="macro">matches!</span>( |
| <span class="self">Self</span>::CONFIG.formatted_components, |
| FC::Time | FC::DateTime | FC::DateTimeOffset | FC::TimeOffset |
| ); |
| <span class="doccomment">/// Whether the UTC offset should be formatted. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>FORMAT_OFFSET: bool = <span class="macro">matches!</span>( |
| <span class="self">Self</span>::CONFIG.formatted_components, |
| FC::Offset | FC::DateTimeOffset | FC::TimeOffset |
| ); |
| <span class="doccomment">/// Whether the year is six digits. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>YEAR_IS_SIX_DIGITS: bool = <span class="self">Self</span>::CONFIG.year_is_six_digits; |
| <span class="doccomment">/// Whether the format contains separators (such as `-` or `:`). |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>USE_SEPARATORS: bool = <span class="self">Self</span>::CONFIG.use_separators; |
| <span class="doccomment">/// Which format to use for the date. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>DATE_KIND: DateKind = <span class="self">Self</span>::CONFIG.date_kind; |
| <span class="doccomment">/// The precision and number of decimal digits to use for the time. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>TIME_PRECISION: TimePrecision = <span class="self">Self</span>::CONFIG.time_precision; |
| <span class="doccomment">/// The precision for the UTC offset. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const </span>OFFSET_PRECISION: OffsetPrecision = <span class="self">Self</span>::CONFIG.offset_precision; |
| } |
| |
| <span class="kw">impl </span>Config { |
| <span class="doccomment">/// Encode the configuration, permitting it to be used as a const parameter of |
| /// [`Iso8601`](super::Iso8601). |
| /// |
| /// The value returned by this method must only be used as a const parameter to |
| /// [`Iso8601`](super::Iso8601). Any other usage is unspecified behavior. |
| </span><span class="kw">pub const fn </span>encode(<span class="kw-2">&</span><span class="self">self</span>) -> EncodedConfig { |
| <span class="kw">let </span><span class="kw-2">mut </span>bytes = [<span class="number">0</span>; EncodedConfig::BITS <span class="kw">as </span>usize / <span class="number">8</span>]; |
| |
| bytes[<span class="number">0</span>] = <span class="kw">match </span><span class="self">self</span>.formatted_components { |
| FC::None => <span class="number">0</span>, |
| FC::Date => <span class="number">1</span>, |
| FC::Time => <span class="number">2</span>, |
| FC::Offset => <span class="number">3</span>, |
| FC::DateTime => <span class="number">4</span>, |
| FC::DateTimeOffset => <span class="number">5</span>, |
| FC::TimeOffset => <span class="number">6</span>, |
| }; |
| bytes[<span class="number">1</span>] = <span class="self">self</span>.use_separators <span class="kw">as _</span>; |
| bytes[<span class="number">2</span>] = <span class="self">self</span>.year_is_six_digits <span class="kw">as _</span>; |
| bytes[<span class="number">3</span>] = <span class="kw">match </span><span class="self">self</span>.date_kind { |
| DateKind::Calendar => <span class="number">0</span>, |
| DateKind::Week => <span class="number">1</span>, |
| DateKind::Ordinal => <span class="number">2</span>, |
| }; |
| bytes[<span class="number">4</span>] = <span class="kw">match </span><span class="self">self</span>.time_precision { |
| TimePrecision::Hour { .. } => <span class="number">0</span>, |
| TimePrecision::Minute { .. } => <span class="number">1</span>, |
| TimePrecision::Second { .. } => <span class="number">2</span>, |
| }; |
| bytes[<span class="number">5</span>] = <span class="kw">match </span><span class="self">self</span>.time_precision { |
| TimePrecision::Hour { decimal_digits } |
| | TimePrecision::Minute { decimal_digits } |
| | TimePrecision::Second { decimal_digits } => <span class="kw">match </span>decimal_digits { |
| <span class="prelude-val">None </span>=> <span class="number">0</span>, |
| <span class="prelude-val">Some</span>(decimal_digits) => decimal_digits.get(), |
| }, |
| }; |
| bytes[<span class="number">6</span>] = <span class="kw">match </span><span class="self">self</span>.offset_precision { |
| OffsetPrecision::Hour => <span class="number">0</span>, |
| OffsetPrecision::Minute => <span class="number">1</span>, |
| }; |
| |
| EncodedConfig::from_be_bytes(bytes) |
| } |
| |
| <span class="doccomment">/// Decode the configuration. The configuration must have been generated from |
| /// [`Config::encode`]. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">const fn </span>decode(encoded: EncodedConfig) -> <span class="self">Self </span>{ |
| <span class="kw">let </span>bytes = encoded.to_be_bytes(); |
| |
| <span class="kw">let </span>formatted_components = <span class="kw">match </span>bytes[<span class="number">0</span>] { |
| <span class="number">0 </span>=> FC::None, |
| <span class="number">1 </span>=> FC::Date, |
| <span class="number">2 </span>=> FC::Time, |
| <span class="number">3 </span>=> FC::Offset, |
| <span class="number">4 </span>=> FC::DateTime, |
| <span class="number">5 </span>=> FC::DateTimeOffset, |
| <span class="number">6 </span>=> FC::TimeOffset, |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"invalid configuration"</span>), |
| }; |
| <span class="kw">let </span>use_separators = <span class="kw">match </span>bytes[<span class="number">1</span>] { |
| <span class="number">0 </span>=> <span class="bool-val">false</span>, |
| <span class="number">1 </span>=> <span class="bool-val">true</span>, |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"invalid configuration"</span>), |
| }; |
| <span class="kw">let </span>year_is_six_digits = <span class="kw">match </span>bytes[<span class="number">2</span>] { |
| <span class="number">0 </span>=> <span class="bool-val">false</span>, |
| <span class="number">1 </span>=> <span class="bool-val">true</span>, |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"invalid configuration"</span>), |
| }; |
| <span class="kw">let </span>date_kind = <span class="kw">match </span>bytes[<span class="number">3</span>] { |
| <span class="number">0 </span>=> DateKind::Calendar, |
| <span class="number">1 </span>=> DateKind::Week, |
| <span class="number">2 </span>=> DateKind::Ordinal, |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"invalid configuration"</span>), |
| }; |
| <span class="kw">let </span>time_precision = <span class="kw">match </span>bytes[<span class="number">4</span>] { |
| <span class="number">0 </span>=> TimePrecision::Hour { |
| decimal_digits: NonZeroU8::new(bytes[<span class="number">5</span>]), |
| }, |
| <span class="number">1 </span>=> TimePrecision::Minute { |
| decimal_digits: NonZeroU8::new(bytes[<span class="number">5</span>]), |
| }, |
| <span class="number">2 </span>=> TimePrecision::Second { |
| decimal_digits: NonZeroU8::new(bytes[<span class="number">5</span>]), |
| }, |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"invalid configuration"</span>), |
| }; |
| <span class="kw">let </span>offset_precision = <span class="kw">match </span>bytes[<span class="number">6</span>] { |
| <span class="number">0 </span>=> OffsetPrecision::Hour, |
| <span class="number">1 </span>=> OffsetPrecision::Minute, |
| <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"invalid configuration"</span>), |
| }; |
| |
| <span class="comment">// No `for` loops in `const fn`. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>idx = <span class="number">7</span>; <span class="comment">// first unused byte |
| </span><span class="kw">while </span>idx < EncodedConfig::BITS <span class="kw">as </span>usize / <span class="number">8 </span>{ |
| <span class="macro">assert!</span>(bytes[idx] == <span class="number">0</span>, <span class="string">"invalid configuration"</span>); |
| idx += <span class="number">1</span>; |
| } |
| |
| <span class="self">Self </span>{ |
| formatted_components, |
| use_separators, |
| year_is_six_digits, |
| date_kind, |
| time_precision, |
| offset_precision, |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="macro">macro_rules! </span>eq { |
| (<span class="macro-nonterminal">$a</span>:expr, <span class="macro-nonterminal">$b</span>:expr) => {{ |
| <span class="kw">let </span>a = <span class="macro-nonterminal">$a</span>; |
| <span class="kw">let </span>b = <span class="macro-nonterminal">$b</span>; |
| a.formatted_components == b.formatted_components |
| && a.use_separators == b.use_separators |
| && a.year_is_six_digits == b.year_is_six_digits |
| && a.date_kind == b.date_kind |
| && a.time_precision == b.time_precision |
| && a.offset_precision == b.offset_precision |
| }}; |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>encoding_roundtrip() { |
| <span class="macro">macro_rules! </span>assert_roundtrip { |
| (<span class="macro-nonterminal">$config</span>:expr) => { |
| <span class="kw">let </span>config = <span class="macro-nonterminal">$config</span>; |
| <span class="kw">let </span>encoded = config.encode(); |
| <span class="kw">let </span>decoded = Config::decode(encoded); |
| <span class="macro">assert!</span>(<span class="macro">eq!</span>(config, decoded)); |
| }; |
| } |
| |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_formatted_components(FC::None)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_formatted_components(FC::Date)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_formatted_components(FC::Time)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_formatted_components(FC::Offset)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_formatted_components(FC::DateTime)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_formatted_components(FC::DateTimeOffset)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_formatted_components(FC::TimeOffset)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_use_separators(<span class="bool-val">false</span>)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_use_separators(<span class="bool-val">true</span>)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_year_is_six_digits(<span class="bool-val">false</span>)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_year_is_six_digits(<span class="bool-val">true</span>)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_date_kind(DateKind::Calendar)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_date_kind(DateKind::Week)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_date_kind(DateKind::Ordinal)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_time_precision(TimePrecision::Hour { |
| decimal_digits: <span class="prelude-val">None</span>, |
| })); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_time_precision(TimePrecision::Minute { |
| decimal_digits: <span class="prelude-val">None</span>, |
| })); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_time_precision(TimePrecision::Second { |
| decimal_digits: <span class="prelude-val">None</span>, |
| })); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_time_precision(TimePrecision::Hour { |
| decimal_digits: NonZeroU8::new(<span class="number">1</span>), |
| })); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_time_precision(TimePrecision::Minute { |
| decimal_digits: NonZeroU8::new(<span class="number">1</span>), |
| })); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_time_precision(TimePrecision::Second { |
| decimal_digits: NonZeroU8::new(<span class="number">1</span>), |
| })); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_offset_precision(OffsetPrecision::Hour)); |
| <span class="macro">assert_roundtrip!</span>(Config::DEFAULT.set_offset_precision(OffsetPrecision::Minute)); |
| } |
| |
| <span class="macro">macro_rules! </span>assert_decode_fail { |
| (<span class="macro-nonterminal">$encoding</span>:expr) => { |
| <span class="macro">assert!</span>( |
| std::panic::catch_unwind(|| { |
| Config::decode(<span class="macro-nonterminal">$encoding</span>); |
| }) |
| .is_err() |
| ); |
| }; |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>decode_fail() { |
| <span class="macro">assert_decode_fail!</span>(<span class="number">0x07_00_00_00_00_00_00_00_00_00_00_00_00_00_00_00</span>); |
| <span class="macro">assert_decode_fail!</span>(<span class="number">0x00_02_00_00_00_00_00_00_00_00_00_00_00_00_00_00</span>); |
| <span class="macro">assert_decode_fail!</span>(<span class="number">0x00_00_02_00_00_00_00_00_00_00_00_00_00_00_00_00</span>); |
| <span class="macro">assert_decode_fail!</span>(<span class="number">0x00_00_00_03_00_00_00_00_00_00_00_00_00_00_00_00</span>); |
| <span class="macro">assert_decode_fail!</span>(<span class="number">0x00_00_00_00_03_00_00_00_00_00_00_00_00_00_00_00</span>); |
| <span class="macro">assert_decode_fail!</span>(<span class="number">0x00_00_00_00_00_00_02_00_00_00_00_00_00_00_00_00</span>); |
| <span class="macro">assert_decode_fail!</span>(<span class="number">0x00_00_00_00_00_00_00_01_00_00_00_00_00_00_00_00</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> |
