| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/chrono-0.4.26/src/format/scan.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>scan.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../normalize.css"><link rel="stylesheet" href="../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../ayu.css" disabled><link rel="stylesheet" href="../../../dark.css" disabled><link rel="stylesheet" href="../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../storage.js"></script><script defer src="../../../source-script.js"></script><script defer src="../../../source-files.js"></script><script defer src="../../../main.js"></script><noscript><link rel="stylesheet" href="../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../chrono/index.html"><div class="logo-container"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../chrono/index.html"><img class="rust-logo" src="../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// This is a part of Chrono. |
| // See README.md and LICENSE.txt for details. |
| |
| </span><span class="doccomment">/*! |
| * Various scanning routines for the parser. |
| */ |
| |
| </span><span class="attribute">#![allow(deprecated)] |
| |
| </span><span class="kw">use super</span>::{ParseResult, INVALID, OUT_OF_RANGE, TOO_SHORT}; |
| <span class="kw">use </span><span class="kw">crate</span>::Weekday; |
| |
| <span class="doccomment">/// Returns true when two slices are equal case-insensitively (in ASCII). |
| /// Assumes that the `pattern` is already converted to lower case. |
| </span><span class="kw">fn </span>equals(s: <span class="kw-2">&</span>[u8], pattern: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">let </span><span class="kw-2">mut </span>xs = s.iter().map(|<span class="kw-2">&</span>c| <span class="kw">match </span>c { |
| <span class="string">b'A'</span>..=<span class="string">b'Z' </span>=> c + <span class="number">32</span>, |
| <span class="kw">_ </span>=> c, |
| }); |
| <span class="kw">let </span><span class="kw-2">mut </span>ys = pattern.as_bytes().iter().cloned(); |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span>(xs.next(), ys.next()) { |
| (<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) => <span class="kw">return </span><span class="bool-val">true</span>, |
| (<span class="prelude-val">None</span>, <span class="kw">_</span>) | (<span class="kw">_</span>, <span class="prelude-val">None</span>) => <span class="kw">return </span><span class="bool-val">false</span>, |
| (<span class="prelude-val">Some</span>(x), <span class="prelude-val">Some</span>(y)) <span class="kw">if </span>x != y => <span class="kw">return </span><span class="bool-val">false</span>, |
| <span class="kw">_ </span>=> (), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Tries to parse the non-negative number from `min` to `max` digits. |
| /// |
| /// The absence of digits at all is an unconditional error. |
| /// More than `max` digits are consumed up to the first `max` digits. |
| /// Any number that does not fit in `i64` is an error. |
| </span><span class="attribute">#[inline] |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>number(s: <span class="kw-2">&</span>str, min: usize, max: usize) -> ParseResult<(<span class="kw-2">&</span>str, i64)> { |
| <span class="macro">assert!</span>(min <= max); |
| |
| <span class="comment">// We are only interested in ascii numbers, so we can work with the `str` as bytes. We stop on |
| // the first non-numeric byte, which may be another ascii character or beginning of multi-byte |
| // UTF-8 character. |
| </span><span class="kw">let </span>bytes = s.as_bytes(); |
| <span class="kw">if </span>bytes.len() < min { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(TOO_SHORT); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>n = <span class="number">0i64</span>; |
| <span class="kw">for </span>(i, c) <span class="kw">in </span>bytes.iter().take(max).cloned().enumerate() { |
| <span class="comment">// cloned() = copied() |
| </span><span class="kw">if </span>!c.is_ascii_digit() { |
| <span class="kw">if </span>i < min { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(INVALID); |
| } <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Ok</span>((<span class="kw-2">&</span>s[i..], n)); |
| } |
| } |
| |
| n = <span class="kw">match </span>n.checked_mul(<span class="number">10</span>).and_then(|n| n.checked_add((c - <span class="string">b'0'</span>) <span class="kw">as </span>i64)) { |
| <span class="prelude-val">Some</span>(n) => n, |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(OUT_OF_RANGE), |
| }; |
| } |
| |
| <span class="prelude-val">Ok</span>((<span class="kw-2">&</span>s[core::cmp::min(max, bytes.len())..], n)) |
| } |
| |
| <span class="doccomment">/// Tries to consume at least one digits as a fractional second. |
| /// Returns the number of whole nanoseconds (0--999,999,999). |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>nanosecond(s: <span class="kw-2">&</span>str) -> ParseResult<(<span class="kw-2">&</span>str, i64)> { |
| <span class="comment">// record the number of digits consumed for later scaling. |
| </span><span class="kw">let </span>origlen = s.len(); |
| <span class="kw">let </span>(s, v) = number(s, <span class="number">1</span>, <span class="number">9</span>)<span class="question-mark">?</span>; |
| <span class="kw">let </span>consumed = origlen - s.len(); |
| |
| <span class="comment">// scale the number accordingly. |
| </span><span class="kw">static </span>SCALE: [i64; <span class="number">10</span>] = |
| [<span class="number">0</span>, <span class="number">100_000_000</span>, <span class="number">10_000_000</span>, <span class="number">1_000_000</span>, <span class="number">100_000</span>, <span class="number">10_000</span>, <span class="number">1_000</span>, <span class="number">100</span>, <span class="number">10</span>, <span class="number">1</span>]; |
| <span class="kw">let </span>v = v.checked_mul(SCALE[consumed]).ok_or(OUT_OF_RANGE)<span class="question-mark">?</span>; |
| |
| <span class="comment">// if there are more than 9 digits, skip next digits. |
| </span><span class="kw">let </span>s = s.trim_left_matches(|c: char| c.is_ascii_digit()); |
| |
| <span class="prelude-val">Ok</span>((s, v)) |
| } |
| |
| <span class="doccomment">/// Tries to consume a fixed number of digits as a fractional second. |
| /// Returns the number of whole nanoseconds (0--999,999,999). |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>nanosecond_fixed(s: <span class="kw-2">&</span>str, digits: usize) -> ParseResult<(<span class="kw-2">&</span>str, i64)> { |
| <span class="comment">// record the number of digits consumed for later scaling. |
| </span><span class="kw">let </span>(s, v) = number(s, digits, digits)<span class="question-mark">?</span>; |
| |
| <span class="comment">// scale the number accordingly. |
| </span><span class="kw">static </span>SCALE: [i64; <span class="number">10</span>] = |
| [<span class="number">0</span>, <span class="number">100_000_000</span>, <span class="number">10_000_000</span>, <span class="number">1_000_000</span>, <span class="number">100_000</span>, <span class="number">10_000</span>, <span class="number">1_000</span>, <span class="number">100</span>, <span class="number">10</span>, <span class="number">1</span>]; |
| <span class="kw">let </span>v = v.checked_mul(SCALE[digits]).ok_or(OUT_OF_RANGE)<span class="question-mark">?</span>; |
| |
| <span class="prelude-val">Ok</span>((s, v)) |
| } |
| |
| <span class="doccomment">/// Tries to parse the month index (0 through 11) with the first three ASCII letters. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>short_month0(s: <span class="kw-2">&</span>str) -> ParseResult<(<span class="kw-2">&</span>str, u8)> { |
| <span class="kw">if </span>s.len() < <span class="number">3 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(TOO_SHORT); |
| } |
| <span class="kw">let </span>buf = s.as_bytes(); |
| <span class="kw">let </span>month0 = <span class="kw">match </span>(buf[<span class="number">0</span>] | <span class="number">32</span>, buf[<span class="number">1</span>] | <span class="number">32</span>, buf[<span class="number">2</span>] | <span class="number">32</span>) { |
| (<span class="string">b'j'</span>, <span class="string">b'a'</span>, <span class="string">b'n'</span>) => <span class="number">0</span>, |
| (<span class="string">b'f'</span>, <span class="string">b'e'</span>, <span class="string">b'b'</span>) => <span class="number">1</span>, |
| (<span class="string">b'm'</span>, <span class="string">b'a'</span>, <span class="string">b'r'</span>) => <span class="number">2</span>, |
| (<span class="string">b'a'</span>, <span class="string">b'p'</span>, <span class="string">b'r'</span>) => <span class="number">3</span>, |
| (<span class="string">b'm'</span>, <span class="string">b'a'</span>, <span class="string">b'y'</span>) => <span class="number">4</span>, |
| (<span class="string">b'j'</span>, <span class="string">b'u'</span>, <span class="string">b'n'</span>) => <span class="number">5</span>, |
| (<span class="string">b'j'</span>, <span class="string">b'u'</span>, <span class="string">b'l'</span>) => <span class="number">6</span>, |
| (<span class="string">b'a'</span>, <span class="string">b'u'</span>, <span class="string">b'g'</span>) => <span class="number">7</span>, |
| (<span class="string">b's'</span>, <span class="string">b'e'</span>, <span class="string">b'p'</span>) => <span class="number">8</span>, |
| (<span class="string">b'o'</span>, <span class="string">b'c'</span>, <span class="string">b't'</span>) => <span class="number">9</span>, |
| (<span class="string">b'n'</span>, <span class="string">b'o'</span>, <span class="string">b'v'</span>) => <span class="number">10</span>, |
| (<span class="string">b'd'</span>, <span class="string">b'e'</span>, <span class="string">b'c'</span>) => <span class="number">11</span>, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(INVALID), |
| }; |
| <span class="prelude-val">Ok</span>((<span class="kw-2">&</span>s[<span class="number">3</span>..], month0)) |
| } |
| |
| <span class="doccomment">/// Tries to parse the weekday with the first three ASCII letters. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>short_weekday(s: <span class="kw-2">&</span>str) -> ParseResult<(<span class="kw-2">&</span>str, Weekday)> { |
| <span class="kw">if </span>s.len() < <span class="number">3 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(TOO_SHORT); |
| } |
| <span class="kw">let </span>buf = s.as_bytes(); |
| <span class="kw">let </span>weekday = <span class="kw">match </span>(buf[<span class="number">0</span>] | <span class="number">32</span>, buf[<span class="number">1</span>] | <span class="number">32</span>, buf[<span class="number">2</span>] | <span class="number">32</span>) { |
| (<span class="string">b'm'</span>, <span class="string">b'o'</span>, <span class="string">b'n'</span>) => Weekday::Mon, |
| (<span class="string">b't'</span>, <span class="string">b'u'</span>, <span class="string">b'e'</span>) => Weekday::Tue, |
| (<span class="string">b'w'</span>, <span class="string">b'e'</span>, <span class="string">b'd'</span>) => Weekday::Wed, |
| (<span class="string">b't'</span>, <span class="string">b'h'</span>, <span class="string">b'u'</span>) => Weekday::Thu, |
| (<span class="string">b'f'</span>, <span class="string">b'r'</span>, <span class="string">b'i'</span>) => Weekday::Fri, |
| (<span class="string">b's'</span>, <span class="string">b'a'</span>, <span class="string">b't'</span>) => Weekday::Sat, |
| (<span class="string">b's'</span>, <span class="string">b'u'</span>, <span class="string">b'n'</span>) => Weekday::Sun, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(INVALID), |
| }; |
| <span class="prelude-val">Ok</span>((<span class="kw-2">&</span>s[<span class="number">3</span>..], weekday)) |
| } |
| |
| <span class="doccomment">/// Tries to parse the month index (0 through 11) with short or long month names. |
| /// It prefers long month names to short month names when both are possible. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>short_or_long_month0(s: <span class="kw-2">&</span>str) -> ParseResult<(<span class="kw-2">&</span>str, u8)> { |
| <span class="comment">// lowercased month names, minus first three chars |
| </span><span class="kw">static </span>LONG_MONTH_SUFFIXES: [<span class="kw-2">&</span>str; <span class="number">12</span>] = |
| [<span class="string">"uary"</span>, <span class="string">"ruary"</span>, <span class="string">"ch"</span>, <span class="string">"il"</span>, <span class="string">""</span>, <span class="string">"e"</span>, <span class="string">"y"</span>, <span class="string">"ust"</span>, <span class="string">"tember"</span>, <span class="string">"ober"</span>, <span class="string">"ember"</span>, <span class="string">"ember"</span>]; |
| |
| <span class="kw">let </span>(<span class="kw-2">mut </span>s, month0) = short_month0(s)<span class="question-mark">?</span>; |
| |
| <span class="comment">// tries to consume the suffix if possible |
| </span><span class="kw">let </span>suffix = LONG_MONTH_SUFFIXES[month0 <span class="kw">as </span>usize]; |
| <span class="kw">if </span>s.len() >= suffix.len() && equals(<span class="kw-2">&</span>s.as_bytes()[..suffix.len()], suffix) { |
| s = <span class="kw-2">&</span>s[suffix.len()..]; |
| } |
| |
| <span class="prelude-val">Ok</span>((s, month0)) |
| } |
| |
| <span class="doccomment">/// Tries to parse the weekday with short or long weekday names. |
| /// It prefers long weekday names to short weekday names when both are possible. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>short_or_long_weekday(s: <span class="kw-2">&</span>str) -> ParseResult<(<span class="kw-2">&</span>str, Weekday)> { |
| <span class="comment">// lowercased weekday names, minus first three chars |
| </span><span class="kw">static </span>LONG_WEEKDAY_SUFFIXES: [<span class="kw-2">&</span>str; <span class="number">7</span>] = |
| [<span class="string">"day"</span>, <span class="string">"sday"</span>, <span class="string">"nesday"</span>, <span class="string">"rsday"</span>, <span class="string">"day"</span>, <span class="string">"urday"</span>, <span class="string">"day"</span>]; |
| |
| <span class="kw">let </span>(<span class="kw-2">mut </span>s, weekday) = short_weekday(s)<span class="question-mark">?</span>; |
| |
| <span class="comment">// tries to consume the suffix if possible |
| </span><span class="kw">let </span>suffix = LONG_WEEKDAY_SUFFIXES[weekday.num_days_from_monday() <span class="kw">as </span>usize]; |
| <span class="kw">if </span>s.len() >= suffix.len() && equals(<span class="kw-2">&</span>s.as_bytes()[..suffix.len()], suffix) { |
| s = <span class="kw-2">&</span>s[suffix.len()..]; |
| } |
| |
| <span class="prelude-val">Ok</span>((s, weekday)) |
| } |
| |
| <span class="doccomment">/// Tries to consume exactly one given character. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>char(s: <span class="kw-2">&</span>str, c1: u8) -> ParseResult<<span class="kw-2">&</span>str> { |
| <span class="kw">match </span>s.as_bytes().first() { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span>c) <span class="kw">if </span>c == c1 => <span class="prelude-val">Ok</span>(<span class="kw-2">&</span>s[<span class="number">1</span>..]), |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => <span class="prelude-val">Err</span>(INVALID), |
| <span class="prelude-val">None </span>=> <span class="prelude-val">Err</span>(TOO_SHORT), |
| } |
| } |
| |
| <span class="doccomment">/// Tries to consume one or more whitespace. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>space(s: <span class="kw-2">&</span>str) -> ParseResult<<span class="kw-2">&</span>str> { |
| <span class="kw">let </span>s_ = s.trim_left(); |
| <span class="kw">if </span>s_.len() < s.len() { |
| <span class="prelude-val">Ok</span>(s_) |
| } <span class="kw">else if </span>s.is_empty() { |
| <span class="prelude-val">Err</span>(TOO_SHORT) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(INVALID) |
| } |
| } |
| |
| <span class="doccomment">/// Consumes any number (including zero) of colon or spaces. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>colon_or_space(s: <span class="kw-2">&</span>str) -> ParseResult<<span class="kw-2">&</span>str> { |
| <span class="prelude-val">Ok</span>(s.trim_left_matches(|c: char| c == <span class="string">':' </span>|| c.is_whitespace())) |
| } |
| |
| <span class="doccomment">/// Tries to parse `[-+]\d\d` continued by `\d\d`. Return an offset in seconds if possible. |
| /// |
| /// The additional `colon` may be used to parse a mandatory or optional `:` |
| /// between hours and minutes, and should return either a new suffix or `Err` when parsing fails. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>timezone_offset<F>(s: <span class="kw-2">&</span>str, consume_colon: F) -> ParseResult<(<span class="kw-2">&</span>str, i32)> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span>str) -> ParseResult<<span class="kw-2">&</span>str>, |
| { |
| timezone_offset_internal(s, consume_colon, <span class="bool-val">false</span>) |
| } |
| |
| <span class="kw">fn </span>timezone_offset_internal<F>( |
| <span class="kw-2">mut </span>s: <span class="kw-2">&</span>str, |
| <span class="kw-2">mut </span>consume_colon: F, |
| allow_missing_minutes: bool, |
| ) -> ParseResult<(<span class="kw-2">&</span>str, i32)> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span>str) -> ParseResult<<span class="kw-2">&</span>str>, |
| { |
| <span class="kw">const fn </span>digits(s: <span class="kw-2">&</span>str) -> ParseResult<(u8, u8)> { |
| <span class="kw">let </span>b = s.as_bytes(); |
| <span class="kw">if </span>b.len() < <span class="number">2 </span>{ |
| <span class="prelude-val">Err</span>(TOO_SHORT) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>((b[<span class="number">0</span>], b[<span class="number">1</span>])) |
| } |
| } |
| <span class="kw">let </span>negative = <span class="kw">match </span>s.as_bytes().first() { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b'+'</span>) => <span class="bool-val">false</span>, |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b'-'</span>) => <span class="bool-val">true</span>, |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => <span class="kw">return </span><span class="prelude-val">Err</span>(INVALID), |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(TOO_SHORT), |
| }; |
| s = <span class="kw-2">&</span>s[<span class="number">1</span>..]; |
| |
| <span class="comment">// hours (00--99) |
| </span><span class="kw">let </span>hours = <span class="kw">match </span>digits(s)<span class="question-mark">? </span>{ |
| (h1 @ <span class="string">b'0'</span>..=<span class="string">b'9'</span>, h2 @ <span class="string">b'0'</span>..=<span class="string">b'9'</span>) => i32::from((h1 - <span class="string">b'0'</span>) * <span class="number">10 </span>+ (h2 - <span class="string">b'0'</span>)), |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(INVALID), |
| }; |
| s = <span class="kw-2">&</span>s[<span class="number">2</span>..]; |
| |
| <span class="comment">// colons (and possibly other separators) |
| </span>s = consume_colon(s)<span class="question-mark">?</span>; |
| |
| <span class="comment">// minutes (00--59) |
| // if the next two items are digits then we have to add minutes |
| </span><span class="kw">let </span>minutes = <span class="kw">if let </span><span class="prelude-val">Ok</span>(ds) = digits(s) { |
| <span class="kw">match </span>ds { |
| (m1 @ <span class="string">b'0'</span>..=<span class="string">b'5'</span>, m2 @ <span class="string">b'0'</span>..=<span class="string">b'9'</span>) => i32::from((m1 - <span class="string">b'0'</span>) * <span class="number">10 </span>+ (m2 - <span class="string">b'0'</span>)), |
| (<span class="string">b'6'</span>..=<span class="string">b'9'</span>, <span class="string">b'0'</span>..=<span class="string">b'9'</span>) => <span class="kw">return </span><span class="prelude-val">Err</span>(OUT_OF_RANGE), |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(INVALID), |
| } |
| } <span class="kw">else if </span>allow_missing_minutes { |
| <span class="number">0 |
| </span>} <span class="kw">else </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(TOO_SHORT); |
| }; |
| s = <span class="kw">match </span>s.len() { |
| len <span class="kw">if </span>len >= <span class="number">2 </span>=> <span class="kw-2">&</span>s[<span class="number">2</span>..], |
| len <span class="kw">if </span>len == <span class="number">0 </span>=> s, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(TOO_SHORT), |
| }; |
| |
| <span class="kw">let </span>seconds = hours * <span class="number">3600 </span>+ minutes * <span class="number">60</span>; |
| <span class="prelude-val">Ok</span>((s, <span class="kw">if </span>negative { -seconds } <span class="kw">else </span>{ seconds })) |
| } |
| |
| <span class="doccomment">/// Same as `timezone_offset` but also allows for `z`/`Z` which is the same as `+00:00`. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>timezone_offset_zulu<F>(s: <span class="kw-2">&</span>str, colon: F) -> ParseResult<(<span class="kw-2">&</span>str, i32)> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span>str) -> ParseResult<<span class="kw-2">&</span>str>, |
| { |
| <span class="kw">let </span>bytes = s.as_bytes(); |
| <span class="kw">match </span>bytes.first() { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b'z'</span>) | <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b'Z'</span>) => <span class="prelude-val">Ok</span>((<span class="kw-2">&</span>s[<span class="number">1</span>..], <span class="number">0</span>)), |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b'u'</span>) | <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b'U'</span>) => { |
| <span class="kw">if </span>bytes.len() >= <span class="number">3 </span>{ |
| <span class="kw">let </span>(b, c) = (bytes[<span class="number">1</span>], bytes[<span class="number">2</span>]); |
| <span class="kw">match </span>(b | <span class="number">32</span>, c | <span class="number">32</span>) { |
| (<span class="string">b't'</span>, <span class="string">b'c'</span>) => <span class="prelude-val">Ok</span>((<span class="kw-2">&</span>s[<span class="number">3</span>..], <span class="number">0</span>)), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(INVALID), |
| } |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Err</span>(INVALID) |
| } |
| } |
| <span class="kw">_ </span>=> timezone_offset(s, colon), |
| } |
| } |
| |
| <span class="doccomment">/// Same as `timezone_offset` but also allows for `z`/`Z` which is the same as |
| /// `+00:00`, and allows missing minutes entirely. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>timezone_offset_permissive<F>(s: <span class="kw-2">&</span>str, colon: F) -> ParseResult<(<span class="kw-2">&</span>str, i32)> |
| <span class="kw">where |
| </span>F: FnMut(<span class="kw-2">&</span>str) -> ParseResult<<span class="kw-2">&</span>str>, |
| { |
| <span class="kw">match </span>s.as_bytes().first() { |
| <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b'z'</span>) | <span class="prelude-val">Some</span>(<span class="kw-2">&</span><span class="string">b'Z'</span>) => <span class="prelude-val">Ok</span>((<span class="kw-2">&</span>s[<span class="number">1</span>..], <span class="number">0</span>)), |
| <span class="kw">_ </span>=> timezone_offset_internal(s, colon, <span class="bool-val">true</span>), |
| } |
| } |
| |
| <span class="doccomment">/// Same as `timezone_offset` but also allows for RFC 2822 legacy timezones. |
| /// May return `None` which indicates an insufficient offset data (i.e. `-0000`). |
| /// See [RFC 2822 Section 4.3]. |
| /// |
| /// [RFC 2822 Section 4.3]: https://tools.ietf.org/html/rfc2822#section-4.3 |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>timezone_offset_2822(s: <span class="kw-2">&</span>str) -> ParseResult<(<span class="kw-2">&</span>str, <span class="prelude-ty">Option</span><i32>)> { |
| <span class="comment">// tries to parse legacy time zone names |
| </span><span class="kw">let </span>upto = s.as_bytes().iter().position(|<span class="kw-2">&</span>c| !c.is_ascii_alphabetic()).unwrap_or(s.len()); |
| <span class="kw">if </span>upto > <span class="number">0 </span>{ |
| <span class="kw">let </span>name = <span class="kw-2">&</span>s.as_bytes()[..upto]; |
| <span class="kw">let </span>s = <span class="kw-2">&</span>s[upto..]; |
| <span class="kw">let </span>offset_hours = |o| <span class="prelude-val">Ok</span>((s, <span class="prelude-val">Some</span>(o * <span class="number">3600</span>))); |
| <span class="kw">if </span>equals(name, <span class="string">"gmt"</span>) || equals(name, <span class="string">"ut"</span>) { |
| offset_hours(<span class="number">0</span>) |
| } <span class="kw">else if </span>equals(name, <span class="string">"edt"</span>) { |
| offset_hours(-<span class="number">4</span>) |
| } <span class="kw">else if </span>equals(name, <span class="string">"est"</span>) || equals(name, <span class="string">"cdt"</span>) { |
| offset_hours(-<span class="number">5</span>) |
| } <span class="kw">else if </span>equals(name, <span class="string">"cst"</span>) || equals(name, <span class="string">"mdt"</span>) { |
| offset_hours(-<span class="number">6</span>) |
| } <span class="kw">else if </span>equals(name, <span class="string">"mst"</span>) || equals(name, <span class="string">"pdt"</span>) { |
| offset_hours(-<span class="number">7</span>) |
| } <span class="kw">else if </span>equals(name, <span class="string">"pst"</span>) { |
| offset_hours(-<span class="number">8</span>) |
| } <span class="kw">else if </span>name.len() == <span class="number">1 </span>{ |
| <span class="kw">match </span>name[<span class="number">0</span>] { |
| <span class="comment">// recommended by RFC 2822: consume but treat it as -0000 |
| </span><span class="string">b'a'</span>..=<span class="string">b'i' </span>| <span class="string">b'k'</span>..=<span class="string">b'z' </span>| <span class="string">b'A'</span>..=<span class="string">b'I' </span>| <span class="string">b'K'</span>..=<span class="string">b'Z' </span>=> offset_hours(<span class="number">0</span>), |
| <span class="kw">_ </span>=> <span class="prelude-val">Ok</span>((s, <span class="prelude-val">None</span>)), |
| } |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>((s, <span class="prelude-val">None</span>)) |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>(s_, offset) = timezone_offset(s, |s| <span class="prelude-val">Ok</span>(s))<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((s_, <span class="prelude-val">Some</span>(offset))) |
| } |
| } |
| |
| <span class="doccomment">/// Tries to consume everything until next whitespace-like symbol. |
| /// Does not provide any offset information from the consumed data. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>timezone_name_skip(s: <span class="kw-2">&</span>str) -> ParseResult<(<span class="kw-2">&</span>str, ())> { |
| <span class="prelude-val">Ok</span>((s.trim_left_matches(|c: char| !c.is_whitespace()), ())) |
| } |
| |
| <span class="doccomment">/// Tries to consume an RFC2822 comment including preceding ` `. |
| /// |
| /// Returns the remaining string after the closing parenthesis. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>comment_2822(s: <span class="kw-2">&</span>str) -> ParseResult<(<span class="kw-2">&</span>str, ())> { |
| <span class="kw">use </span>CommentState::<span class="kw-2">*</span>; |
| |
| <span class="kw">let </span>s = s.trim_start(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>state = Start; |
| <span class="kw">for </span>(i, c) <span class="kw">in </span>s.bytes().enumerate() { |
| state = <span class="kw">match </span>(state, c) { |
| (Start, <span class="string">b'('</span>) => Next(<span class="number">1</span>), |
| (Next(<span class="number">1</span>), <span class="string">b')'</span>) => <span class="kw">return </span><span class="prelude-val">Ok</span>((<span class="kw-2">&</span>s[i + <span class="number">1</span>..], ())), |
| (Next(depth), <span class="string">b'\\'</span>) => Escape(depth), |
| (Next(depth), <span class="string">b'('</span>) => Next(depth + <span class="number">1</span>), |
| (Next(depth), <span class="string">b')'</span>) => Next(depth - <span class="number">1</span>), |
| (Next(depth), <span class="kw">_</span>) | (Escape(depth), <span class="kw">_</span>) => Next(depth), |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">Err</span>(INVALID), |
| }; |
| } |
| |
| <span class="prelude-val">Err</span>(TOO_SHORT) |
| } |
| |
| <span class="kw">enum </span>CommentState { |
| Start, |
| Next(usize), |
| Escape(usize), |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| #[test] |
| </span><span class="kw">fn </span>test_rfc2822_comments() { |
| <span class="kw">let </span>testdata = [ |
| (<span class="string">""</span>, <span class="prelude-val">Err</span>(TOO_SHORT)), |
| (<span class="string">" "</span>, <span class="prelude-val">Err</span>(TOO_SHORT)), |
| (<span class="string">"x"</span>, <span class="prelude-val">Err</span>(INVALID)), |
| (<span class="string">"("</span>, <span class="prelude-val">Err</span>(TOO_SHORT)), |
| (<span class="string">"()"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">" \r\n\t()"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">"() "</span>, <span class="prelude-val">Ok</span>(<span class="string">" "</span>)), |
| (<span class="string">"()z"</span>, <span class="prelude-val">Ok</span>(<span class="string">"z"</span>)), |
| (<span class="string">"(x)"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">"(())"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">"((()))"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">"(x(x(x)x)x)"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">"( x ( x ( x ) x ) x )"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">r"(\)"</span>, <span class="prelude-val">Err</span>(TOO_SHORT)), |
| (<span class="string">r"(\()"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">r"(\))"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">r"(\\)"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">"(()())"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| (<span class="string">"( x ( x ) x ( x ) x )"</span>, <span class="prelude-val">Ok</span>(<span class="string">""</span>)), |
| ]; |
| |
| <span class="kw">for </span>(test_in, expected) <span class="kw">in </span>testdata.iter() { |
| <span class="kw">let </span>actual = comment_2822(test_in).map(|(s, <span class="kw">_</span>)| s); |
| <span class="macro">assert_eq!</span>( |
| <span class="kw-2">*</span>expected, actual, |
| <span class="string">"{:?} expected to produce {:?}, but produced {:?}."</span>, |
| test_in, expected, actual |
| ); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="chrono" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
