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70 lines
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<!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 `/home/justine/.cargo/registry/src/github.com-1ecc6299db9ec823/async-trait-0.1.61/src/parse.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>parse.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" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../../dark.css" disabled><link rel="stylesheet" type="text/css" 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="mobile-topbar"><button class="sidebar-menu-toggle">☰</button><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><h2 class="location"></h2></nav><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"><div class="sub-container"><a class="sub-logo-container" href="../../async_trait/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><nav class="sub"><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"><button type="button">?</button></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></div><section id="main-content" class="content"><div class="example-wrap"><pre class="line-numbers"><span id="1">1</span>
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</pre><pre class="rust"><code><span class="kw">use</span> <span class="ident">proc_macro2::Span</span>;
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<span class="kw">use</span> <span class="ident">syn::parse</span>::{<span class="ident">Error</span>, <span class="ident">Parse</span>, <span class="ident">ParseStream</span>, <span class="prelude-ty">Result</span>};
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<span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">Attribute</span>, <span class="ident">ItemImpl</span>, <span class="ident">ItemTrait</span>, <span class="ident">Token</span>};
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<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Item</span> {
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<span class="ident">Trait</span>(<span class="ident">ItemTrait</span>),
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<span class="ident">Impl</span>(<span class="ident">ItemImpl</span>),
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}
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<span class="kw">impl</span> <span class="ident">Parse</span> <span class="kw">for</span> <span class="ident">Item</span> {
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<span class="kw">fn</span> <span class="ident">parse</span>(<span class="ident">input</span>: <span class="ident">ParseStream</span>) -> <span class="prelude-ty">Result</span><span class="op"><</span><span class="self">Self</span><span class="op">></span> {
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<span class="kw">let</span> <span class="ident">attrs</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">call</span>(<span class="ident">Attribute::parse_outer</span>)<span class="question-mark">?</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">lookahead</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">lookahead1</span>();
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<span class="kw">if</span> <span class="ident">lookahead</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="kw">unsafe</span>]) {
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<span class="kw">let</span> <span class="ident">ahead</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">fork</span>();
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<span class="ident">ahead</span>.<span class="ident">parse</span>::<span class="op"><</span><span class="macro">Token!</span>[<span class="kw">unsafe</span>]<span class="op">></span>()<span class="question-mark">?</span>;
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<span class="ident">lookahead</span> <span class="op">=</span> <span class="ident">ahead</span>.<span class="ident">lookahead1</span>();
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}
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<span class="kw">if</span> <span class="ident">lookahead</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="kw">pub</span>]) <span class="op">|</span><span class="op">|</span> <span class="ident">lookahead</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="kw">trait</span>]) {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">item</span>: <span class="ident">ItemTrait</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
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<span class="ident">item</span>.<span class="ident">attrs</span> <span class="op">=</span> <span class="ident">attrs</span>;
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<span class="prelude-val">Ok</span>(<span class="ident">Item::Trait</span>(<span class="ident">item</span>))
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} <span class="kw">else</span> <span class="kw">if</span> <span class="ident">lookahead</span>.<span class="ident">peek</span>(<span class="macro">Token!</span>[<span class="kw">impl</span>]) {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">item</span>: <span class="ident">ItemImpl</span> <span class="op">=</span> <span class="ident">input</span>.<span class="ident">parse</span>()<span class="question-mark">?</span>;
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<span class="kw">if</span> <span class="ident">item</span>.<span class="ident">trait_</span>.<span class="ident">is_none</span>() {
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<span class="kw">return</span> <span class="prelude-val">Err</span>(<span class="ident">Error::new</span>(<span class="ident">Span::call_site</span>(), <span class="string">"expected a trait impl"</span>));
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}
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<span class="ident">item</span>.<span class="ident">attrs</span> <span class="op">=</span> <span class="ident">attrs</span>;
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<span class="prelude-val">Ok</span>(<span class="ident">Item::Impl</span>(<span class="ident">item</span>))
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} <span class="kw">else</span> {
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<span class="prelude-val">Err</span>(<span class="ident">lookahead</span>.<span class="ident">error</span>())
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}
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}
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}
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</code></pre></div>
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