| <!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/proc-macro-error-attr-1.0.4/src/settings.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>settings.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="../../proc_macro_error_attr/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="../../proc_macro_error_attr/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 crate</span>::{Error, <span class="prelude-ty">Result</span>}; |
| <span class="kw">use </span>proc_macro2::{Ident, Span, TokenStream, TokenTree}; |
| |
| <span class="macro">macro_rules! </span>decl_settings { |
| ($(<span class="macro-nonterminal">$val</span>:expr => <span class="macro-nonterminal">$variant</span>:ident),+ $(,)<span class="kw-2">*</span>) => { |
| <span class="attribute">#[derive(PartialEq)] |
| </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">enum </span>Setting { |
| $(<span class="macro-nonterminal">$variant</span>),* |
| } |
| |
| <span class="kw">fn </span>ident_to_setting(ident: Ident) -> <span class="prelude-ty">Result</span><Setting> { |
| <span class="kw">match </span><span class="kw-2">&*</span>ident.to_string() { |
| $(<span class="macro-nonterminal">$val </span>=> <span class="prelude-val">Ok</span>(Setting::<span class="macro-nonterminal">$variant</span>),)* |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span>possible_vals = [$(<span class="macro-nonterminal">$val</span>),<span class="kw-2">*</span>] |
| .iter() |
| .map(|v| <span class="macro">format!</span>(<span class="string">"`{}`"</span>, v)) |
| .collect::<Vec<<span class="kw">_</span>>>() |
| .join(<span class="string">", "</span>); |
| |
| <span class="prelude-val">Err</span>(Error::new( |
| ident.span(), |
| <span class="macro">format!</span>(<span class="string">"unknown setting `{}`, expected one of {}"</span>, ident, possible_vals))) |
| } |
| } |
| } |
| }; |
| } |
| |
| <span class="macro">decl_settings! </span>{ |
| <span class="string">"assert_unwind_safe" </span>=> AssertUnwindSafe, |
| <span class="string">"allow_not_macro" </span>=> AllowNotMacro, |
| <span class="string">"proc_macro_hack" </span>=> ProcMacroHack, |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>parse_settings(input: TokenStream) -> <span class="prelude-ty">Result</span><Settings> { |
| <span class="kw">let </span><span class="kw-2">mut </span>input = input.into_iter(); |
| <span class="kw">let </span><span class="kw-2">mut </span>res = Settings(Vec::new()); |
| <span class="kw">loop </span>{ |
| <span class="kw">match </span>input.next() { |
| <span class="prelude-val">Some</span>(TokenTree::Ident(ident)) => { |
| res.<span class="number">0</span>.push(ident_to_setting(ident)<span class="question-mark">?</span>); |
| } |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(res), |
| other => { |
| <span class="kw">let </span>span = other.map_or(Span::call_site(), |tt| tt.span()); |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new(span, <span class="string">"expected identifier"</span>.to_string())); |
| } |
| } |
| |
| <span class="kw">match </span>input.next() { |
| <span class="prelude-val">Some</span>(TokenTree::Punct(<span class="kw-2">ref </span>punct)) <span class="kw">if </span>punct.as_char() == <span class="string">',' </span>=> {} |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">Ok</span>(res), |
| other => { |
| <span class="kw">let </span>span = other.map_or(Span::call_site(), |tt| tt.span()); |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new(span, <span class="string">"expected `,`"</span>.to_string())); |
| } |
| } |
| } |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">struct </span>Settings(Vec<Setting>); |
| |
| <span class="kw">impl </span>Settings { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_set(<span class="kw-2">&</span><span class="self">self</span>, setting: Setting) -> bool { |
| <span class="self">self</span>.<span class="number">0</span>.iter().any(|s| <span class="kw-2">*</span>s == setting) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>set(<span class="kw-2">&mut </span><span class="self">self</span>, setting: Setting) { |
| <span class="self">self</span>.<span class="number">0</span>.push(setting) |
| } |
| } |
| </code></pre></div> |
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