| <!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/inventory-impl-0.1.11/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.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="../../inventory_impl/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="../../inventory_impl/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">extern crate </span>proc_macro; |
| |
| <span class="kw">use </span>std::collections::hash_map; |
| <span class="kw">use </span>std::hash::Hasher; |
| |
| <span class="kw">use </span>proc_macro2::{Ident, Span, TokenStream}; |
| <span class="kw">use </span>quote::quote; |
| <span class="kw">use </span>syn::parse::{Parse, ParseStream, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use </span>syn::{bracketed, parse_macro_input, Path, Token}; |
| |
| <span class="kw">struct </span>Input { |
| krate: <span class="prelude-ty">Option</span><Path>, |
| expr: TokenStream, |
| } |
| |
| <span class="kw">impl </span>Parse <span class="kw">for </span>Input { |
| <span class="kw">fn </span>parse(input: ParseStream) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>> { |
| <span class="prelude-val">Ok</span>(Input { |
| krate: { |
| <span class="comment">// #![crate = gflags] |
| </span><span class="kw">if </span>input.peek(<span class="macro">Token!</span>[#]) && input.peek2(<span class="macro">Token!</span>[!]) { |
| input.parse::<<span class="macro">Token!</span>[#]>()<span class="question-mark">?</span>; |
| input.parse::<<span class="macro">Token!</span>[!]>()<span class="question-mark">?</span>; |
| <span class="kw">let </span>content; |
| <span class="macro">bracketed!</span>(content <span class="kw">in </span>input); |
| content.parse::<<span class="macro">Token!</span>[<span class="kw">crate</span>]>()<span class="question-mark">?</span>; |
| content.parse::<<span class="macro">Token!</span>[=]>()<span class="question-mark">?</span>; |
| <span class="kw">let </span>krate = content.parse()<span class="question-mark">?</span>; |
| <span class="prelude-val">Some</span>(krate) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| }, |
| expr: input.parse()<span class="question-mark">?</span>, |
| }) |
| } |
| } |
| |
| <span class="attribute">#[proc_macro] |
| #[doc(hidden)] |
| </span><span class="kw">pub fn </span>submit(input: proc_macro::TokenStream) -> proc_macro::TokenStream { |
| <span class="kw">let </span>input = <span class="macro">parse_macro_input!</span>(input <span class="kw">as </span>Input); |
| |
| <span class="kw">let </span>expr = input.expr; |
| <span class="kw">let </span>init = Ident::new(<span class="kw-2">&</span><span class="macro">format!</span>(<span class="string">"__init{}"</span>, hash(<span class="kw-2">&</span>expr)), Span::call_site()); |
| <span class="kw">let </span>prefix = <span class="kw">match </span>input.krate { |
| <span class="prelude-val">Some</span>(krate) => <span class="macro">quote!</span>(#krate::), |
| <span class="prelude-val">None </span>=> <span class="macro">quote!</span>(), |
| }; |
| |
| <span class="kw">let </span>expanded = <span class="macro">quote! </span>{ |
| <span class="attribute">#[allow(non_upper_case_globals)] |
| #[#prefix inventory::ctor] |
| </span><span class="kw">fn </span>#init() { |
| <span class="comment">// TODO: once existential type is stable, store the caller's |
| // expression into a static and string those statics together into |
| // an intrusive linked list without needing allocation. |
| // |
| // existential type This; |
| // |
| // static mut VALUE: Option<inventory::Node<This>> = None; |
| // |
| // fn value() -> This { |
| // #expr |
| // } |
| // |
| // unsafe { |
| // VALUE = Some(inventory::Node { |
| // value: value(), |
| // next: None, |
| // }); |
| // inventory::submit(VALUE.as_mut().unwrap()); |
| // } |
| |
| </span>#prefix inventory::submit({ #expr }); |
| } |
| }; |
| |
| proc_macro::TokenStream::from(expanded) |
| } |
| |
| <span class="kw">fn </span>hash(input: <span class="kw-2">&</span>TokenStream) -> u64 { |
| <span class="kw">let </span><span class="kw-2">mut </span>hasher = hash_map::DefaultHasher::new(); |
| hasher.write(input.to_string().as_bytes()); |
| hasher.finish() |
| } |
| </code></pre></div> |
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