| <!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/thiserror-impl-1.0.40/src/prop.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>prop.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="../../thiserror_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="../../thiserror_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">use </span><span class="kw">crate</span>::ast::{Enum, Field, Struct, Variant}; |
| <span class="kw">use </span>syn::{Member, Type}; |
| |
| <span class="kw">impl </span>Struct<<span class="lifetime">'_</span>> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>from_field(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Field> { |
| from_field(<span class="kw-2">&</span><span class="self">self</span>.fields) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>source_field(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Field> { |
| source_field(<span class="kw-2">&</span><span class="self">self</span>.fields) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>backtrace_field(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Field> { |
| backtrace_field(<span class="kw-2">&</span><span class="self">self</span>.fields) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>distinct_backtrace_field(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Field> { |
| <span class="kw">let </span>backtrace_field = <span class="self">self</span>.backtrace_field()<span class="question-mark">?</span>; |
| distinct_backtrace_field(backtrace_field, <span class="self">self</span>.from_field()) |
| } |
| } |
| |
| <span class="kw">impl </span>Enum<<span class="lifetime">'_</span>> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>has_source(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.variants |
| .iter() |
| .any(|variant| variant.source_field().is_some() || variant.attrs.transparent.is_some()) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>has_backtrace(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.variants |
| .iter() |
| .any(|variant| variant.backtrace_field().is_some()) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>has_display(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.attrs.display.is_some() |
| || <span class="self">self</span>.attrs.transparent.is_some() |
| || <span class="self">self |
| </span>.variants |
| .iter() |
| .any(|variant| variant.attrs.display.is_some()) |
| || <span class="self">self |
| </span>.variants |
| .iter() |
| .all(|variant| variant.attrs.transparent.is_some()) |
| } |
| } |
| |
| <span class="kw">impl </span>Variant<<span class="lifetime">'_</span>> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>from_field(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Field> { |
| from_field(<span class="kw-2">&</span><span class="self">self</span>.fields) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>source_field(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Field> { |
| source_field(<span class="kw-2">&</span><span class="self">self</span>.fields) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>backtrace_field(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Field> { |
| backtrace_field(<span class="kw-2">&</span><span class="self">self</span>.fields) |
| } |
| |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>distinct_backtrace_field(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Field> { |
| <span class="kw">let </span>backtrace_field = <span class="self">self</span>.backtrace_field()<span class="question-mark">?</span>; |
| distinct_backtrace_field(backtrace_field, <span class="self">self</span>.from_field()) |
| } |
| } |
| |
| <span class="kw">impl </span>Field<<span class="lifetime">'_</span>> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>is_backtrace(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| type_is_backtrace(<span class="self">self</span>.ty) |
| } |
| } |
| |
| <span class="kw">fn </span>from_field<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>>(fields: <span class="kw-2">&</span><span class="lifetime">'a </span>[Field<<span class="lifetime">'b</span>>]) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>Field<<span class="lifetime">'b</span>>> { |
| <span class="kw">for </span>field <span class="kw">in </span>fields { |
| <span class="kw">if </span>field.attrs.from.is_some() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(field); |
| } |
| } |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">fn </span>source_field<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>>(fields: <span class="kw-2">&</span><span class="lifetime">'a </span>[Field<<span class="lifetime">'b</span>>]) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>Field<<span class="lifetime">'b</span>>> { |
| <span class="kw">for </span>field <span class="kw">in </span>fields { |
| <span class="kw">if </span>field.attrs.from.is_some() || field.attrs.source.is_some() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(field); |
| } |
| } |
| <span class="kw">for </span>field <span class="kw">in </span>fields { |
| <span class="kw">match </span><span class="kw-2">&</span>field.member { |
| Member::Named(ident) <span class="kw">if </span>ident == <span class="string">"source" </span>=> <span class="kw">return </span><span class="prelude-val">Some</span>(field), |
| <span class="kw">_ </span>=> {} |
| } |
| } |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="kw">fn </span>backtrace_field<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>>(fields: <span class="kw-2">&</span><span class="lifetime">'a </span>[Field<<span class="lifetime">'b</span>>]) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>Field<<span class="lifetime">'b</span>>> { |
| <span class="kw">for </span>field <span class="kw">in </span>fields { |
| <span class="kw">if </span>field.attrs.backtrace.is_some() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(field); |
| } |
| } |
| <span class="kw">for </span>field <span class="kw">in </span>fields { |
| <span class="kw">if </span>field.is_backtrace() { |
| <span class="kw">return </span><span class="prelude-val">Some</span>(field); |
| } |
| } |
| <span class="prelude-val">None |
| </span>} |
| |
| <span class="comment">// The #[backtrace] field, if it is not the same as the #[from] field. |
| </span><span class="kw">fn </span>distinct_backtrace_field<<span class="lifetime">'a</span>, <span class="lifetime">'b</span>>( |
| backtrace_field: <span class="kw-2">&</span><span class="lifetime">'a </span>Field<<span class="lifetime">'b</span>>, |
| from_field: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>Field>, |
| ) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>Field<<span class="lifetime">'b</span>>> { |
| <span class="kw">if </span>from_field.map_or(<span class="bool-val">false</span>, |from_field| { |
| from_field.member == backtrace_field.member |
| }) { |
| <span class="prelude-val">None |
| </span>} <span class="kw">else </span>{ |
| <span class="prelude-val">Some</span>(backtrace_field) |
| } |
| } |
| |
| <span class="kw">fn </span>type_is_backtrace(ty: <span class="kw-2">&</span>Type) -> bool { |
| <span class="kw">let </span>path = <span class="kw">match </span>ty { |
| Type::Path(ty) => <span class="kw-2">&</span>ty.path, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="bool-val">false</span>, |
| }; |
| |
| <span class="kw">let </span>last = path.segments.last().unwrap(); |
| last.ident == <span class="string">"Backtrace" </span>&& last.arguments.is_empty() |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="thiserror_impl" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |