| <!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/async-trait-0.1.68/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="../../async_trait/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="../../async_trait/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="kw">use </span>proc_macro2::{Span, TokenStream}; |
| <span class="kw">use </span>std::mem; |
| <span class="kw">use </span>syn::visit_mut::{<span class="self">self</span>, VisitMut}; |
| <span class="kw">use </span>syn::{ |
| parse_quote_spanned, token, Expr, GenericArgument, Lifetime, Receiver, ReturnType, Token, Type, |
| TypeBareFn, TypeImplTrait, TypeParen, TypePtr, TypeReference, |
| }; |
| |
| <span class="kw">pub struct </span>CollectLifetimes { |
| <span class="kw">pub </span>elided: Vec<Lifetime>, |
| <span class="kw">pub </span>explicit: Vec<Lifetime>, |
| } |
| |
| <span class="kw">impl </span>CollectLifetimes { |
| <span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| CollectLifetimes { |
| elided: Vec::new(), |
| explicit: Vec::new(), |
| } |
| } |
| |
| <span class="kw">fn </span>visit_opt_lifetime(<span class="kw-2">&mut </span><span class="self">self</span>, reference: <span class="macro">Token!</span>[<span class="kw-2">&</span>], lifetime: <span class="kw-2">&mut </span><span class="prelude-ty">Option</span><Lifetime>) { |
| <span class="kw">match </span>lifetime { |
| <span class="prelude-val">None </span>=> <span class="kw-2">*</span>lifetime = <span class="prelude-val">Some</span>(<span class="self">self</span>.next_lifetime(reference.span)), |
| <span class="prelude-val">Some</span>(lifetime) => <span class="self">self</span>.visit_lifetime(lifetime), |
| } |
| } |
| |
| <span class="kw">fn </span>visit_lifetime(<span class="kw-2">&mut </span><span class="self">self</span>, lifetime: <span class="kw-2">&mut </span>Lifetime) { |
| <span class="kw">if </span>lifetime.ident == <span class="string">"_" </span>{ |
| <span class="kw-2">*</span>lifetime = <span class="self">self</span>.next_lifetime(lifetime.span()); |
| } <span class="kw">else </span>{ |
| <span class="self">self</span>.explicit.push(lifetime.clone()); |
| } |
| } |
| |
| <span class="kw">fn </span>next_lifetime(<span class="kw-2">&mut </span><span class="self">self</span>, span: Span) -> Lifetime { |
| <span class="kw">let </span>name = <span class="macro">format!</span>(<span class="string">"'life{}"</span>, <span class="self">self</span>.elided.len()); |
| <span class="kw">let </span>life = Lifetime::new(<span class="kw-2">&</span>name, span); |
| <span class="self">self</span>.elided.push(life.clone()); |
| life |
| } |
| } |
| |
| <span class="kw">impl </span>VisitMut <span class="kw">for </span>CollectLifetimes { |
| <span class="kw">fn </span>visit_receiver_mut(<span class="kw-2">&mut </span><span class="self">self</span>, arg: <span class="kw-2">&mut </span>Receiver) { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>((reference, lifetime)) = <span class="kw-2">&mut </span>arg.reference { |
| <span class="self">self</span>.visit_opt_lifetime(<span class="kw-2">*</span>reference, lifetime); |
| } <span class="kw">else </span>{ |
| visit_mut::visit_type_mut(<span class="self">self</span>, <span class="kw-2">&mut </span>arg.ty); |
| } |
| } |
| |
| <span class="kw">fn </span>visit_type_reference_mut(<span class="kw-2">&mut </span><span class="self">self</span>, ty: <span class="kw-2">&mut </span>TypeReference) { |
| <span class="self">self</span>.visit_opt_lifetime(ty.and_token, <span class="kw-2">&mut </span>ty.lifetime); |
| visit_mut::visit_type_reference_mut(<span class="self">self</span>, ty); |
| } |
| |
| <span class="kw">fn </span>visit_generic_argument_mut(<span class="kw-2">&mut </span><span class="self">self</span>, gen: <span class="kw-2">&mut </span>GenericArgument) { |
| <span class="kw">if let </span>GenericArgument::Lifetime(lifetime) = gen { |
| <span class="self">self</span>.visit_lifetime(lifetime); |
| } |
| visit_mut::visit_generic_argument_mut(<span class="self">self</span>, gen); |
| } |
| } |
| |
| <span class="kw">pub struct </span>AddLifetimeToImplTrait; |
| |
| <span class="kw">impl </span>VisitMut <span class="kw">for </span>AddLifetimeToImplTrait { |
| <span class="kw">fn </span>visit_type_impl_trait_mut(<span class="kw-2">&mut </span><span class="self">self</span>, ty: <span class="kw-2">&mut </span>TypeImplTrait) { |
| <span class="kw">let </span>span = ty.impl_token.span; |
| <span class="kw">let </span>lifetime = <span class="macro">parse_quote_spanned!</span>(span=> <span class="lifetime">'async_trait</span>); |
| ty.bounds.insert(<span class="number">0</span>, lifetime); |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(punct) = ty.bounds.pairs_mut().next().unwrap().punct_mut() { |
| punct.span = span; |
| } |
| visit_mut::visit_type_impl_trait_mut(<span class="self">self</span>, ty); |
| } |
| |
| <span class="kw">fn </span>visit_type_reference_mut(<span class="kw-2">&mut </span><span class="self">self</span>, ty: <span class="kw-2">&mut </span>TypeReference) { |
| parenthesize_impl_trait(<span class="kw-2">&mut </span>ty.elem, ty.and_token.span); |
| visit_mut::visit_type_reference_mut(<span class="self">self</span>, ty); |
| } |
| |
| <span class="kw">fn </span>visit_type_ptr_mut(<span class="kw-2">&mut </span><span class="self">self</span>, ty: <span class="kw-2">&mut </span>TypePtr) { |
| parenthesize_impl_trait(<span class="kw-2">&mut </span>ty.elem, ty.star_token.span); |
| visit_mut::visit_type_ptr_mut(<span class="self">self</span>, ty); |
| } |
| |
| <span class="kw">fn </span>visit_type_bare_fn_mut(<span class="kw-2">&mut </span><span class="self">self</span>, ty: <span class="kw-2">&mut </span>TypeBareFn) { |
| <span class="kw">if let </span>ReturnType::Type(arrow, return_type) = <span class="kw-2">&mut </span>ty.output { |
| parenthesize_impl_trait(return_type, arrow.spans[<span class="number">0</span>]); |
| } |
| visit_mut::visit_type_bare_fn_mut(<span class="self">self</span>, ty); |
| } |
| |
| <span class="kw">fn </span>visit_expr_mut(<span class="kw-2">&mut </span><span class="self">self</span>, _e: <span class="kw-2">&mut </span>Expr) { |
| <span class="comment">// Do not recurse into impl Traits inside of an array length expression. |
| // |
| // fn outer(arg: [u8; { fn inner(_: impl Trait) {}; 0 }]); |
| </span>} |
| } |
| |
| <span class="kw">fn </span>parenthesize_impl_trait(elem: <span class="kw-2">&mut </span>Type, paren_span: Span) { |
| <span class="kw">if let </span>Type::ImplTrait(<span class="kw">_</span>) = <span class="kw-2">*</span>elem { |
| <span class="kw">let </span>placeholder = Type::Verbatim(TokenStream::new()); |
| <span class="kw-2">*</span>elem = Type::Paren(TypeParen { |
| paren_token: token::Paren(paren_span), |
| elem: Box::new(mem::replace(elem, placeholder)), |
| }); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="async_trait" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
