| <!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/serde_derive-1.0.163/src/internals/ctxt.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ctxt.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="../../../serde_derive/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="../../../serde_derive/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>quote::ToTokens; |
| <span class="kw">use </span>std::cell::RefCell; |
| <span class="kw">use </span>std::fmt::Display; |
| <span class="kw">use </span>std::thread; |
| <span class="kw">use </span>syn; |
| |
| <span class="doccomment">/// A type to collect errors together and format them. |
| /// |
| /// Dropping this object will cause a panic. It must be consumed using `check`. |
| /// |
| /// References can be shared since this type uses run-time exclusive mut checking. |
| </span><span class="attribute">#[derive(Default)] |
| </span><span class="kw">pub struct </span>Ctxt { |
| <span class="comment">// The contents will be set to `None` during checking. This is so that checking can be |
| // enforced. |
| </span>errors: RefCell<<span class="prelude-ty">Option</span><Vec<syn::Error>>>, |
| } |
| |
| <span class="kw">impl </span>Ctxt { |
| <span class="doccomment">/// Create a new context object. |
| /// |
| /// This object contains no errors, but will still trigger a panic if it is not `check`ed. |
| </span><span class="kw">pub fn </span>new() -> <span class="self">Self </span>{ |
| Ctxt { |
| errors: RefCell::new(<span class="prelude-val">Some</span>(Vec::new())), |
| } |
| } |
| |
| <span class="doccomment">/// Add an error to the context object with a tokenenizable object. |
| /// |
| /// The object is used for spanning in error messages. |
| </span><span class="kw">pub fn </span>error_spanned_by<A: ToTokens, T: Display>(<span class="kw-2">&</span><span class="self">self</span>, obj: A, msg: T) { |
| <span class="self">self</span>.errors |
| .borrow_mut() |
| .as_mut() |
| .unwrap() |
| <span class="comment">// Curb monomorphization from generating too many identical methods. |
| </span>.push(syn::Error::new_spanned(obj.into_token_stream(), msg)); |
| } |
| |
| <span class="doccomment">/// Add one of Syn's parse errors. |
| </span><span class="kw">pub fn </span>syn_error(<span class="kw-2">&</span><span class="self">self</span>, err: syn::Error) { |
| <span class="self">self</span>.errors.borrow_mut().as_mut().unwrap().push(err); |
| } |
| |
| <span class="doccomment">/// Consume this object, producing a formatted error string if there are errors. |
| </span><span class="kw">pub fn </span>check(<span class="self">self</span>) -> <span class="prelude-ty">Result</span><(), Vec<syn::Error>> { |
| <span class="kw">let </span>errors = <span class="self">self</span>.errors.borrow_mut().take().unwrap(); |
| <span class="kw">match </span>errors.len() { |
| <span class="number">0 </span>=> <span class="prelude-val">Ok</span>(()), |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(errors), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Drop <span class="kw">for </span>Ctxt { |
| <span class="kw">fn </span>drop(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="kw">if </span>!thread::panicking() && <span class="self">self</span>.errors.borrow().is_some() { |
| <span class="macro">panic!</span>(<span class="string">"forgot to check for errors"</span>); |
| } |
| } |
| } |
| </code></pre></div> |
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