| <!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/valid.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>valid.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, Input, Struct, Variant}; |
| <span class="kw">use </span><span class="kw">crate</span>::attr::Attrs; |
| <span class="kw">use </span>quote::ToTokens; |
| <span class="kw">use </span>std::collections::BTreeSet <span class="kw">as </span>Set; |
| <span class="kw">use </span>syn::{Error, GenericArgument, Member, PathArguments, <span class="prelude-ty">Result</span>, Type}; |
| |
| <span class="kw">impl </span>Input<<span class="lifetime">'_</span>> { |
| <span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>validate(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Input::Struct(input) => input.validate(), |
| Input::Enum(input) => input.validate(), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>Struct<<span class="lifetime">'_</span>> { |
| <span class="kw">fn </span>validate(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| check_non_field_attrs(<span class="kw-2">&</span><span class="self">self</span>.attrs)<span class="question-mark">?</span>; |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(transparent) = <span class="self">self</span>.attrs.transparent { |
| <span class="kw">if </span><span class="self">self</span>.fields.len() != <span class="number">1 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| transparent.original, |
| <span class="string">"#[error(transparent)] requires exactly one field"</span>, |
| )); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(source) = <span class="self">self</span>.fields.iter().find_map(|f| f.attrs.source) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| source, |
| <span class="string">"transparent error struct can't contain #[source]"</span>, |
| )); |
| } |
| } |
| check_field_attrs(<span class="kw-2">&</span><span class="self">self</span>.fields)<span class="question-mark">?</span>; |
| <span class="kw">for </span>field <span class="kw">in </span><span class="kw-2">&</span><span class="self">self</span>.fields { |
| field.validate()<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>Enum<<span class="lifetime">'_</span>> { |
| <span class="kw">fn </span>validate(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| check_non_field_attrs(<span class="kw-2">&</span><span class="self">self</span>.attrs)<span class="question-mark">?</span>; |
| <span class="kw">let </span>has_display = <span class="self">self</span>.has_display(); |
| <span class="kw">for </span>variant <span class="kw">in </span><span class="kw-2">&</span><span class="self">self</span>.variants { |
| variant.validate()<span class="question-mark">?</span>; |
| <span class="kw">if </span>has_display && variant.attrs.display.is_none() && variant.attrs.transparent.is_none() |
| { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| variant.original, |
| <span class="string">"missing #[error(\"...\")] display attribute"</span>, |
| )); |
| } |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>from_types = Set::new(); |
| <span class="kw">for </span>variant <span class="kw">in </span><span class="kw-2">&</span><span class="self">self</span>.variants { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(from_field) = variant.from_field() { |
| <span class="kw">let </span>repr = from_field.ty.to_token_stream().to_string(); |
| <span class="kw">if </span>!from_types.insert(repr) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| from_field.original, |
| <span class="string">"cannot derive From because another variant has the same source type"</span>, |
| )); |
| } |
| } |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>Variant<<span class="lifetime">'_</span>> { |
| <span class="kw">fn </span>validate(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| check_non_field_attrs(<span class="kw-2">&</span><span class="self">self</span>.attrs)<span class="question-mark">?</span>; |
| <span class="kw">if </span><span class="self">self</span>.attrs.transparent.is_some() { |
| <span class="kw">if </span><span class="self">self</span>.fields.len() != <span class="number">1 </span>{ |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| <span class="self">self</span>.original, |
| <span class="string">"#[error(transparent)] requires exactly one field"</span>, |
| )); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(source) = <span class="self">self</span>.fields.iter().find_map(|f| f.attrs.source) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| source, |
| <span class="string">"transparent variant can't contain #[source]"</span>, |
| )); |
| } |
| } |
| check_field_attrs(<span class="kw-2">&</span><span class="self">self</span>.fields)<span class="question-mark">?</span>; |
| <span class="kw">for </span>field <span class="kw">in </span><span class="kw-2">&</span><span class="self">self</span>.fields { |
| field.validate()<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl </span>Field<<span class="lifetime">'_</span>> { |
| <span class="kw">fn </span>validate(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(display) = <span class="kw-2">&</span><span class="self">self</span>.attrs.display { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| display.original, |
| <span class="string">"not expected here; the #[error(...)] attribute belongs on top of a struct or an enum variant"</span>, |
| )); |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">fn </span>check_non_field_attrs(attrs: <span class="kw-2">&</span>Attrs) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(from) = <span class="kw-2">&</span>attrs.from { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| from, |
| <span class="string">"not expected here; the #[from] attribute belongs on a specific field"</span>, |
| )); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(source) = <span class="kw-2">&</span>attrs.source { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| source, |
| <span class="string">"not expected here; the #[source] attribute belongs on a specific field"</span>, |
| )); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(backtrace) = <span class="kw-2">&</span>attrs.backtrace { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| backtrace, |
| <span class="string">"not expected here; the #[backtrace] attribute belongs on a specific field"</span>, |
| )); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(display) = <span class="kw-2">&</span>attrs.display { |
| <span class="kw">if </span>attrs.transparent.is_some() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| display.original, |
| <span class="string">"cannot have both #[error(transparent)] and a display attribute"</span>, |
| )); |
| } |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>check_field_attrs(fields: <span class="kw-2">&</span>[Field]) -> <span class="prelude-ty">Result</span><()> { |
| <span class="kw">let </span><span class="kw-2">mut </span>from_field = <span class="prelude-val">None</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>source_field = <span class="prelude-val">None</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>backtrace_field = <span class="prelude-val">None</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>has_backtrace = <span class="bool-val">false</span>; |
| <span class="kw">for </span>field <span class="kw">in </span>fields { |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(from) = field.attrs.from { |
| <span class="kw">if </span>from_field.is_some() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned(from, <span class="string">"duplicate #[from] attribute"</span>)); |
| } |
| from_field = <span class="prelude-val">Some</span>(field); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(source) = field.attrs.source { |
| <span class="kw">if </span>source_field.is_some() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned(source, <span class="string">"duplicate #[source] attribute"</span>)); |
| } |
| source_field = <span class="prelude-val">Some</span>(field); |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(backtrace) = field.attrs.backtrace { |
| <span class="kw">if </span>backtrace_field.is_some() { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| backtrace, |
| <span class="string">"duplicate #[backtrace] attribute"</span>, |
| )); |
| } |
| backtrace_field = <span class="prelude-val">Some</span>(field); |
| has_backtrace = <span class="bool-val">true</span>; |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(transparent) = field.attrs.transparent { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| transparent.original, |
| <span class="string">"#[error(transparent)] needs to go outside the enum or struct, not on an individual field"</span>, |
| )); |
| } |
| has_backtrace |= field.is_backtrace(); |
| } |
| <span class="kw">if let </span>(<span class="prelude-val">Some</span>(from_field), <span class="prelude-val">Some</span>(source_field)) = (from_field, source_field) { |
| <span class="kw">if </span>!same_member(from_field, source_field) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| from_field.attrs.from, |
| <span class="string">"#[from] is only supported on the source field, not any other field"</span>, |
| )); |
| } |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(from_field) = from_field { |
| <span class="kw">let </span>max_expected_fields = <span class="kw">match </span>backtrace_field { |
| <span class="prelude-val">Some</span>(backtrace_field) => <span class="number">1 </span>+ !same_member(from_field, backtrace_field) <span class="kw">as </span>usize, |
| <span class="prelude-val">None </span>=> <span class="number">1 </span>+ has_backtrace <span class="kw">as </span>usize, |
| }; |
| <span class="kw">if </span>fields.len() > max_expected_fields { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| from_field.attrs.from, |
| <span class="string">"deriving From requires no fields other than source and backtrace"</span>, |
| )); |
| } |
| } |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(source_field) = source_field.or(from_field) { |
| <span class="kw">if </span>contains_non_static_lifetime(source_field.ty) { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(Error::new_spanned( |
| <span class="kw-2">&</span>source_field.original.ty, |
| <span class="string">"non-static lifetimes are not allowed in the source of an error, because std::error::Error requires the source is dyn Error + 'static"</span>, |
| )); |
| } |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>same_member(one: <span class="kw-2">&</span>Field, two: <span class="kw-2">&</span>Field) -> bool { |
| <span class="kw">match </span>(<span class="kw-2">&</span>one.member, <span class="kw-2">&</span>two.member) { |
| (Member::Named(one), Member::Named(two)) => one == two, |
| (Member::Unnamed(one), Member::Unnamed(two)) => one.index == two.index, |
| <span class="kw">_ </span>=> <span class="macro">unreachable!</span>(), |
| } |
| } |
| |
| <span class="kw">fn </span>contains_non_static_lifetime(ty: <span class="kw-2">&</span>Type) -> bool { |
| <span class="kw">match </span>ty { |
| Type::Path(ty) => { |
| <span class="kw">let </span>bracketed = <span class="kw">match </span><span class="kw-2">&</span>ty.path.segments.last().unwrap().arguments { |
| PathArguments::AngleBracketed(bracketed) => bracketed, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="bool-val">false</span>, |
| }; |
| <span class="kw">for </span>arg <span class="kw">in </span><span class="kw-2">&</span>bracketed.args { |
| <span class="kw">match </span>arg { |
| GenericArgument::Type(ty) <span class="kw">if </span>contains_non_static_lifetime(ty) => <span class="kw">return </span><span class="bool-val">true</span>, |
| GenericArgument::Lifetime(lifetime) <span class="kw">if </span>lifetime.ident != <span class="string">"static" </span>=> { |
| <span class="kw">return </span><span class="bool-val">true |
| </span>} |
| <span class="kw">_ </span>=> {} |
| } |
| } |
| <span class="bool-val">false |
| </span>} |
| Type::Reference(ty) => ty |
| .lifetime |
| .as_ref() |
| .map_or(<span class="bool-val">false</span>, |lifetime| lifetime.ident != <span class="string">"static"</span>), |
| <span class="kw">_ </span>=> <span class="bool-val">false</span>, <span class="comment">// maybe implement later if there are common other cases |
| </span>} |
| } |
| </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> |
