| <!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/time-0.3.21/src/parsing/combinator/mod.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>mod.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="icon" href="https://avatars0.githubusercontent.com/u/55999857"></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="../../../../time/index.html"><div class="logo-container"> |
| <img src="https://avatars0.githubusercontent.com/u/55999857" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../time/index.html"> |
| <img src="https://avatars0.githubusercontent.com/u/55999857" 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> |
| <span id="2">2</span> |
| <span id="3">3</span> |
| <span id="4">4</span> |
| <span id="5">5</span> |
| <span id="6">6</span> |
| <span id="7">7</span> |
| <span id="8">8</span> |
| <span id="9">9</span> |
| <span id="10">10</span> |
| <span id="11">11</span> |
| <span id="12">12</span> |
| <span id="13">13</span> |
| <span id="14">14</span> |
| <span id="15">15</span> |
| <span id="16">16</span> |
| <span id="17">17</span> |
| <span id="18">18</span> |
| <span id="19">19</span> |
| <span id="20">20</span> |
| <span id="21">21</span> |
| <span id="22">22</span> |
| <span id="23">23</span> |
| <span id="24">24</span> |
| <span id="25">25</span> |
| <span id="26">26</span> |
| <span id="27">27</span> |
| <span id="28">28</span> |
| <span id="29">29</span> |
| <span id="30">30</span> |
| <span id="31">31</span> |
| <span id="32">32</span> |
| <span id="33">33</span> |
| <span id="34">34</span> |
| <span id="35">35</span> |
| <span id="36">36</span> |
| <span id="37">37</span> |
| <span id="38">38</span> |
| <span id="39">39</span> |
| <span id="40">40</span> |
| <span id="41">41</span> |
| <span id="42">42</span> |
| <span id="43">43</span> |
| <span id="44">44</span> |
| <span id="45">45</span> |
| <span id="46">46</span> |
| <span id="47">47</span> |
| <span id="48">48</span> |
| <span id="49">49</span> |
| <span id="50">50</span> |
| <span id="51">51</span> |
| <span id="52">52</span> |
| <span id="53">53</span> |
| <span id="54">54</span> |
| <span id="55">55</span> |
| <span id="56">56</span> |
| <span id="57">57</span> |
| <span id="58">58</span> |
| <span id="59">59</span> |
| <span id="60">60</span> |
| <span id="61">61</span> |
| <span id="62">62</span> |
| <span id="63">63</span> |
| <span id="64">64</span> |
| <span id="65">65</span> |
| <span id="66">66</span> |
| <span id="67">67</span> |
| <span id="68">68</span> |
| <span id="69">69</span> |
| <span id="70">70</span> |
| <span id="71">71</span> |
| <span id="72">72</span> |
| <span id="73">73</span> |
| <span id="74">74</span> |
| <span id="75">75</span> |
| <span id="76">76</span> |
| <span id="77">77</span> |
| <span id="78">78</span> |
| <span id="79">79</span> |
| <span id="80">80</span> |
| <span id="81">81</span> |
| <span id="82">82</span> |
| <span id="83">83</span> |
| <span id="84">84</span> |
| <span id="85">85</span> |
| <span id="86">86</span> |
| <span id="87">87</span> |
| <span id="88">88</span> |
| <span id="89">89</span> |
| <span id="90">90</span> |
| <span id="91">91</span> |
| <span id="92">92</span> |
| <span id="93">93</span> |
| <span id="94">94</span> |
| <span id="95">95</span> |
| <span id="96">96</span> |
| <span id="97">97</span> |
| <span id="98">98</span> |
| <span id="99">99</span> |
| <span id="100">100</span> |
| <span id="101">101</span> |
| <span id="102">102</span> |
| <span id="103">103</span> |
| <span id="104">104</span> |
| <span id="105">105</span> |
| <span id="106">106</span> |
| <span id="107">107</span> |
| <span id="108">108</span> |
| <span id="109">109</span> |
| <span id="110">110</span> |
| <span id="111">111</span> |
| <span id="112">112</span> |
| <span id="113">113</span> |
| <span id="114">114</span> |
| <span id="115">115</span> |
| <span id="116">116</span> |
| <span id="117">117</span> |
| <span id="118">118</span> |
| <span id="119">119</span> |
| <span id="120">120</span> |
| <span id="121">121</span> |
| <span id="122">122</span> |
| <span id="123">123</span> |
| <span id="124">124</span> |
| <span id="125">125</span> |
| <span id="126">126</span> |
| <span id="127">127</span> |
| <span id="128">128</span> |
| <span id="129">129</span> |
| <span id="130">130</span> |
| <span id="131">131</span> |
| <span id="132">132</span> |
| <span id="133">133</span> |
| <span id="134">134</span> |
| <span id="135">135</span> |
| <span id="136">136</span> |
| <span id="137">137</span> |
| <span id="138">138</span> |
| <span id="139">139</span> |
| <span id="140">140</span> |
| <span id="141">141</span> |
| <span id="142">142</span> |
| <span id="143">143</span> |
| <span id="144">144</span> |
| <span id="145">145</span> |
| <span id="146">146</span> |
| <span id="147">147</span> |
| <span id="148">148</span> |
| <span id="149">149</span> |
| <span id="150">150</span> |
| <span id="151">151</span> |
| <span id="152">152</span> |
| <span id="153">153</span> |
| <span id="154">154</span> |
| <span id="155">155</span> |
| <span id="156">156</span> |
| <span id="157">157</span> |
| <span id="158">158</span> |
| <span id="159">159</span> |
| <span id="160">160</span> |
| <span id="161">161</span> |
| <span id="162">162</span> |
| <span id="163">163</span> |
| <span id="164">164</span> |
| <span id="165">165</span> |
| <span id="166">166</span> |
| <span id="167">167</span> |
| <span id="168">168</span> |
| <span id="169">169</span> |
| <span id="170">170</span> |
| <span id="171">171</span> |
| <span id="172">172</span> |
| <span id="173">173</span> |
| <span id="174">174</span> |
| <span id="175">175</span> |
| <span id="176">176</span> |
| <span id="177">177</span> |
| <span id="178">178</span> |
| <span id="179">179</span> |
| <span id="180">180</span> |
| <span id="181">181</span> |
| <span id="182">182</span> |
| <span id="183">183</span> |
| <span id="184">184</span> |
| <span id="185">185</span> |
| <span id="186">186</span> |
| <span id="187">187</span> |
| <span id="188">188</span> |
| <span id="189">189</span> |
| <span id="190">190</span> |
| <span id="191">191</span> |
| <span id="192">192</span> |
| </pre><pre class="rust"><code><span class="doccomment">//! Implementations of the low-level parser combinators. |
| |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>rfc; |
| |
| <span class="kw">use </span><span class="kw">crate</span>::format_description::modifier::Padding; |
| <span class="kw">use </span><span class="kw">crate</span>::parsing::shim::{Integer, IntegerParseBytes}; |
| <span class="kw">use </span><span class="kw">crate</span>::parsing::ParsedItem; |
| |
| <span class="doccomment">/// Parse a "+" or "-" sign. Returns the ASCII byte representing the sign, if present. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>sign(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, u8>> { |
| <span class="kw">match </span>input { |
| [sign @ (<span class="string">b'-' </span>| <span class="string">b'+'</span>), remaining @ ..] => <span class="prelude-val">Some</span>(ParsedItem(remaining, <span class="kw-2">*</span>sign)), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Consume the first matching item, returning its associated value. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>first_match<<span class="lifetime">'a</span>, T>( |
| options: <span class="kw">impl </span>IntoIterator<Item = (<span class="kw-2">&</span><span class="lifetime">'a </span>[u8], T)>, |
| case_sensitive: bool, |
| ) -> <span class="kw">impl </span>FnMut(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'a</span>, T>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>options = options.into_iter(); |
| <span class="kw">move </span>|input| { |
| options.find_map(|(expected, t)| { |
| <span class="kw">if </span>case_sensitive { |
| <span class="prelude-val">Some</span>(ParsedItem(input.strip_prefix(expected)<span class="question-mark">?</span>, t)) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>n = expected.len(); |
| <span class="kw">if </span>n <= input.len() { |
| <span class="kw">let </span>(head, tail) = input.split_at(n); |
| <span class="kw">if </span>head.eq_ignore_ascii_case(expected) { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(ParsedItem(tail, t)); |
| } |
| } |
| <span class="prelude-val">None |
| </span>} |
| }) |
| } |
| } |
| |
| <span class="doccomment">/// Consume zero or more instances of the provided parser. The parser must return the unit value. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>zero_or_more<<span class="lifetime">'a</span>, P: Fn(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'a</span>, ()>>>( |
| parser: P, |
| ) -> <span class="kw">impl </span>FnMut(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> ParsedItem<<span class="lifetime">'a</span>, ()> { |
| <span class="kw">move </span>|<span class="kw-2">mut </span>input| { |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(remaining) = parser(input) { |
| input = remaining.into_inner(); |
| } |
| ParsedItem(input, ()) |
| } |
| } |
| |
| <span class="doccomment">/// Consume one of or more instances of the provided parser. The parser must produce the unit value. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>one_or_more<<span class="lifetime">'a</span>, P: Fn(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'a</span>, ()>>>( |
| parser: P, |
| ) -> <span class="kw">impl </span>Fn(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'a</span>, ()>> { |
| <span class="kw">move </span>|<span class="kw-2">mut </span>input| { |
| input = parser(input)<span class="question-mark">?</span>.into_inner(); |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(remaining) = parser(input) { |
| input = remaining.into_inner(); |
| } |
| <span class="prelude-val">Some</span>(ParsedItem(input, ())) |
| } |
| } |
| |
| <span class="doccomment">/// Consume between `n` and `m` instances of the provided parser. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>n_to_m< |
| <span class="lifetime">'a</span>, |
| <span class="kw">const </span>N: u8, |
| <span class="kw">const </span>M: u8, |
| T, |
| P: Fn(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'a</span>, T>>, |
| >( |
| parser: P, |
| ) -> <span class="kw">impl </span>Fn(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'a</span>, <span class="kw-2">&</span><span class="lifetime">'a </span>[u8]>> { |
| <span class="macro">debug_assert!</span>(M >= N); |
| <span class="kw">move </span>|<span class="kw-2">mut </span>input| { |
| <span class="comment">// We need to keep this to determine the total length eventually consumed. |
| </span><span class="kw">let </span>orig_input = input; |
| |
| <span class="comment">// Mandatory |
| </span><span class="kw">for _ in </span><span class="number">0</span>..N { |
| input = parser(input)<span class="question-mark">?</span>.<span class="number">0</span>; |
| } |
| |
| <span class="comment">// Optional |
| </span><span class="kw">for _ in </span>N..M { |
| <span class="kw">match </span>parser(input) { |
| <span class="prelude-val">Some</span>(parsed) => input = parsed.<span class="number">0</span>, |
| <span class="prelude-val">None </span>=> <span class="kw">break</span>, |
| } |
| } |
| |
| <span class="prelude-val">Some</span>(ParsedItem( |
| input, |
| <span class="kw-2">&</span>orig_input[..(orig_input.len() - input.len())], |
| )) |
| } |
| } |
| |
| <span class="doccomment">/// Consume between `n` and `m` digits, returning the numerical value. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>n_to_m_digits<<span class="kw">const </span>N: u8, <span class="kw">const </span>M: u8, T: Integer>( |
| input: <span class="kw-2">&</span>[u8], |
| ) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, T>> { |
| <span class="macro">debug_assert!</span>(M >= N); |
| n_to_m::<N, M, <span class="kw">_</span>, <span class="kw">_</span>>(any_digit)(input)<span class="question-mark">?</span>.flat_map(|value| value.parse_bytes()) |
| } |
| |
| <span class="doccomment">/// Consume exactly `n` digits, returning the numerical value. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>exactly_n_digits<<span class="kw">const </span>N: u8, T: Integer>(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, T>> { |
| n_to_m_digits::<N, N, <span class="kw">_</span>>(input) |
| } |
| |
| <span class="doccomment">/// Consume exactly `n` digits, returning the numerical value. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>exactly_n_digits_padded<<span class="lifetime">'a</span>, <span class="kw">const </span>N: u8, T: Integer>( |
| padding: Padding, |
| ) -> <span class="kw">impl </span>Fn(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'a</span>, T>> { |
| n_to_m_digits_padded::<N, N, <span class="kw">_</span>>(padding) |
| } |
| |
| <span class="doccomment">/// Consume between `n` and `m` digits, returning the numerical value. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>n_to_m_digits_padded<<span class="lifetime">'a</span>, <span class="kw">const </span>N: u8, <span class="kw">const </span>M: u8, T: Integer>( |
| padding: Padding, |
| ) -> <span class="kw">impl </span>Fn(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'a</span>, T>> { |
| <span class="macro">debug_assert!</span>(M >= N); |
| <span class="kw">move </span>|<span class="kw-2">mut </span>input| <span class="kw">match </span>padding { |
| Padding::None => n_to_m_digits::<<span class="number">1</span>, M, <span class="kw">_</span>>(input), |
| Padding::Space => { |
| <span class="macro">debug_assert!</span>(N > <span class="number">0</span>); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>orig_input = input; |
| <span class="kw">for _ in </span><span class="number">0</span>..(N - <span class="number">1</span>) { |
| <span class="kw">match </span>ascii_char::<<span class="string">b' '</span>>(input) { |
| <span class="prelude-val">Some</span>(parsed) => input = parsed.<span class="number">0</span>, |
| <span class="prelude-val">None </span>=> <span class="kw">break</span>, |
| } |
| } |
| <span class="kw">let </span>pad_width = (orig_input.len() - input.len()) <span class="kw">as </span>u8; |
| |
| orig_input = input; |
| <span class="kw">for _ in </span><span class="number">0</span>..(N - pad_width) { |
| input = any_digit(input)<span class="question-mark">?</span>.<span class="number">0</span>; |
| } |
| <span class="kw">for _ in </span>N..M { |
| <span class="kw">match </span>any_digit(input) { |
| <span class="prelude-val">Some</span>(parsed) => input = parsed.<span class="number">0</span>, |
| <span class="prelude-val">None </span>=> <span class="kw">break</span>, |
| } |
| } |
| |
| ParsedItem(input, <span class="kw-2">&</span>orig_input[..(orig_input.len() - input.len())]) |
| .flat_map(|value| value.parse_bytes()) |
| } |
| Padding::Zero => n_to_m_digits::<N, M, <span class="kw">_</span>>(input), |
| } |
| } |
| |
| <span class="doccomment">/// Consume exactly one digit. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">const fn </span>any_digit(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, u8>> { |
| <span class="kw">match </span>input { |
| [c, remaining @ ..] <span class="kw">if </span>c.is_ascii_digit() => <span class="prelude-val">Some</span>(ParsedItem(remaining, <span class="kw-2">*</span>c)), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Consume exactly one of the provided ASCII characters. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>ascii_char<<span class="kw">const </span>CHAR: u8>(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, ()>> { |
| <span class="macro">debug_assert!</span>(CHAR.is_ascii_graphic() || CHAR.is_ascii_whitespace()); |
| <span class="kw">match </span>input { |
| [c, remaining @ ..] <span class="kw">if </span><span class="kw-2">*</span>c == CHAR => <span class="prelude-val">Some</span>(ParsedItem(remaining, ())), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Consume exactly one of the provided ASCII characters, case-insensitive. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>ascii_char_ignore_case<<span class="kw">const </span>CHAR: u8>(input: <span class="kw-2">&</span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'_</span>, ()>> { |
| <span class="macro">debug_assert!</span>(CHAR.is_ascii_graphic() || CHAR.is_ascii_whitespace()); |
| <span class="kw">match </span>input { |
| [c, remaining @ ..] <span class="kw">if </span>c.eq_ignore_ascii_case(<span class="kw-2">&</span>CHAR) => <span class="prelude-val">Some</span>(ParsedItem(remaining, ())), |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="doccomment">/// Optionally consume an input with a given parser. |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>opt<<span class="lifetime">'a</span>, T>( |
| parser: <span class="kw">impl </span>Fn(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> <span class="prelude-ty">Option</span><ParsedItem<<span class="lifetime">'a</span>, T>>, |
| ) -> <span class="kw">impl </span>Fn(<span class="kw-2">&</span><span class="lifetime">'a </span>[u8]) -> ParsedItem<<span class="lifetime">'a</span>, <span class="prelude-ty">Option</span><T>> { |
| <span class="kw">move </span>|input| <span class="kw">match </span>parser(input) { |
| <span class="prelude-val">Some</span>(value) => value.map(<span class="prelude-val">Some</span>), |
| <span class="prelude-val">None </span>=> ParsedItem(input, <span class="prelude-val">None</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> |
