| <!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/syn-2.0.18/src/lifetime.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lifetime.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="../../syn/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="../../syn/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> |
| <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> |
| </pre><pre class="rust"><code><span class="kw">use </span>proc_macro2::{Ident, Span}; |
| <span class="kw">use </span>std::cmp::Ordering; |
| <span class="kw">use </span>std::fmt::{<span class="self">self</span>, Display}; |
| <span class="kw">use </span>std::hash::{Hash, Hasher}; |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">use </span><span class="kw">crate</span>::lookahead; |
| |
| <span class="doccomment">/// A Rust lifetime: `'a`. |
| /// |
| /// Lifetime names must conform to the following rules: |
| /// |
| /// - Must start with an apostrophe. |
| /// - Must not consist of just an apostrophe: `'`. |
| /// - Character after the apostrophe must be `_` or a Unicode code point with |
| /// the XID_Start property. |
| /// - All following characters must be Unicode code points with the XID_Continue |
| /// property. |
| </span><span class="kw">pub struct </span>Lifetime { |
| <span class="kw">pub </span>apostrophe: Span, |
| <span class="kw">pub </span>ident: Ident, |
| } |
| |
| <span class="kw">impl </span>Lifetime { |
| <span class="doccomment">/// # Panics |
| /// |
| /// Panics if the lifetime does not conform to the bulleted rules above. |
| /// |
| /// # Invocation |
| /// |
| /// ``` |
| /// # use proc_macro2::Span; |
| /// # use syn::Lifetime; |
| /// # |
| /// # fn f() -> Lifetime { |
| /// Lifetime::new("'a", Span::call_site()) |
| /// # } |
| /// ``` |
| </span><span class="kw">pub fn </span>new(symbol: <span class="kw-2">&</span>str, span: Span) -> <span class="self">Self </span>{ |
| <span class="kw">if </span>!symbol.starts_with(<span class="string">'\''</span>) { |
| <span class="macro">panic!</span>( |
| <span class="string">"lifetime name must start with apostrophe as in \"'a\", got {:?}"</span>, |
| symbol |
| ); |
| } |
| |
| <span class="kw">if </span>symbol == <span class="string">"'" </span>{ |
| <span class="macro">panic!</span>(<span class="string">"lifetime name must not be empty"</span>); |
| } |
| |
| <span class="kw">if </span>!<span class="kw">crate</span>::ident::xid_ok(<span class="kw-2">&</span>symbol[<span class="number">1</span>..]) { |
| <span class="macro">panic!</span>(<span class="string">"{:?} is not a valid lifetime name"</span>, symbol); |
| } |
| |
| Lifetime { |
| apostrophe: span, |
| ident: Ident::new(<span class="kw-2">&</span>symbol[<span class="number">1</span>..], span), |
| } |
| } |
| |
| <span class="kw">pub fn </span>span(<span class="kw-2">&</span><span class="self">self</span>) -> Span { |
| <span class="self">self</span>.apostrophe |
| .join(<span class="self">self</span>.ident.span()) |
| .unwrap_or(<span class="self">self</span>.apostrophe) |
| } |
| |
| <span class="kw">pub fn </span>set_span(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) { |
| <span class="self">self</span>.apostrophe = span; |
| <span class="self">self</span>.ident.set_span(span); |
| } |
| } |
| |
| <span class="kw">impl </span>Display <span class="kw">for </span>Lifetime { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, formatter: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="string">"'"</span>.fmt(formatter)<span class="question-mark">?</span>; |
| <span class="self">self</span>.ident.fmt(formatter) |
| } |
| } |
| |
| <span class="kw">impl </span>Clone <span class="kw">for </span>Lifetime { |
| <span class="kw">fn </span>clone(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="self">Self </span>{ |
| Lifetime { |
| apostrophe: <span class="self">self</span>.apostrophe, |
| ident: <span class="self">self</span>.ident.clone(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>PartialEq <span class="kw">for </span>Lifetime { |
| <span class="kw">fn </span>eq(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Lifetime) -> bool { |
| <span class="self">self</span>.ident.eq(<span class="kw-2">&</span>other.ident) |
| } |
| } |
| |
| <span class="kw">impl </span>Eq <span class="kw">for </span>Lifetime {} |
| |
| <span class="kw">impl </span>PartialOrd <span class="kw">for </span>Lifetime { |
| <span class="kw">fn </span>partial_cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Lifetime) -> <span class="prelude-ty">Option</span><Ordering> { |
| <span class="prelude-val">Some</span>(<span class="self">self</span>.cmp(other)) |
| } |
| } |
| |
| <span class="kw">impl </span>Ord <span class="kw">for </span>Lifetime { |
| <span class="kw">fn </span>cmp(<span class="kw-2">&</span><span class="self">self</span>, other: <span class="kw-2">&</span>Lifetime) -> Ordering { |
| <span class="self">self</span>.ident.cmp(<span class="kw-2">&</span>other.ident) |
| } |
| } |
| |
| <span class="kw">impl </span>Hash <span class="kw">for </span>Lifetime { |
| <span class="kw">fn </span>hash<H: Hasher>(<span class="kw-2">&</span><span class="self">self</span>, h: <span class="kw-2">&mut </span>H) { |
| <span class="self">self</span>.ident.hash(h); |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| #[doc(hidden)] |
| #[allow(non_snake_case)] |
| </span><span class="kw">pub fn </span>Lifetime(marker: lookahead::TokenMarker) -> Lifetime { |
| <span class="kw">match </span>marker {} |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"parsing"</span>)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">mod </span>parsing { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">crate</span>::parse::{Parse, ParseStream, <span class="prelude-ty">Result</span>}; |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"parsing"</span>)))] |
| </span><span class="kw">impl </span>Parse <span class="kw">for </span>Lifetime { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| input.step(|cursor| { |
| cursor |
| .lifetime() |
| .ok_or_else(|| cursor.error(<span class="string">"expected lifetime"</span>)) |
| }) |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(feature = <span class="string">"printing"</span>)] |
| </span><span class="kw">mod </span>printing { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span>proc_macro2::{Punct, Spacing, TokenStream}; |
| <span class="kw">use </span>quote::{ToTokens, TokenStreamExt}; |
| |
| <span class="attribute">#[cfg_attr(doc_cfg, doc(cfg(feature = <span class="string">"printing"</span>)))] |
| </span><span class="kw">impl </span>ToTokens <span class="kw">for </span>Lifetime { |
| <span class="kw">fn </span>to_tokens(<span class="kw-2">&</span><span class="self">self</span>, tokens: <span class="kw-2">&mut </span>TokenStream) { |
| <span class="kw">let </span><span class="kw-2">mut </span>apostrophe = Punct::new(<span class="string">'\''</span>, Spacing::Joint); |
| apostrophe.set_span(<span class="self">self</span>.apostrophe); |
| tokens.append(apostrophe); |
| <span class="self">self</span>.ident.to_tokens(tokens); |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="syn" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
