| <!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/ast.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ast.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="doccomment">//! A Serde ast, parsed from the Syn ast and ready to generate Rust code. |
| |
| </span><span class="kw">use </span>internals::attr; |
| <span class="kw">use </span>internals::check; |
| <span class="kw">use </span>internals::{Ctxt, Derive}; |
| <span class="kw">use </span>syn; |
| <span class="kw">use </span>syn::punctuated::Punctuated; |
| |
| <span class="doccomment">/// A source data structure annotated with `#[derive(Serialize)]` and/or `#[derive(Deserialize)]`, |
| /// parsed into an internal representation. |
| </span><span class="kw">pub struct </span>Container<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// The struct or enum name (without generics). |
| </span><span class="kw">pub </span>ident: syn::Ident, |
| <span class="doccomment">/// Attributes on the structure, parsed for Serde. |
| </span><span class="kw">pub </span>attrs: attr::Container, |
| <span class="doccomment">/// The contents of the struct or enum. |
| </span><span class="kw">pub </span>data: Data<<span class="lifetime">'a</span>>, |
| <span class="doccomment">/// Any generics on the struct or enum. |
| </span><span class="kw">pub </span>generics: <span class="kw-2">&</span><span class="lifetime">'a </span>syn::Generics, |
| <span class="doccomment">/// Original input. |
| </span><span class="kw">pub </span>original: <span class="kw-2">&</span><span class="lifetime">'a </span>syn::DeriveInput, |
| } |
| |
| <span class="doccomment">/// The fields of a struct or enum. |
| /// |
| /// Analogous to `syn::Data`. |
| </span><span class="kw">pub enum </span>Data<<span class="lifetime">'a</span>> { |
| Enum(Vec<Variant<<span class="lifetime">'a</span>>>), |
| Struct(Style, Vec<Field<<span class="lifetime">'a</span>>>), |
| } |
| |
| <span class="doccomment">/// A variant of an enum. |
| </span><span class="kw">pub struct </span>Variant<<span class="lifetime">'a</span>> { |
| <span class="kw">pub </span>ident: syn::Ident, |
| <span class="kw">pub </span>attrs: attr::Variant, |
| <span class="kw">pub </span>style: Style, |
| <span class="kw">pub </span>fields: Vec<Field<<span class="lifetime">'a</span>>>, |
| <span class="kw">pub </span>original: <span class="kw-2">&</span><span class="lifetime">'a </span>syn::Variant, |
| } |
| |
| <span class="doccomment">/// A field of a struct. |
| </span><span class="kw">pub struct </span>Field<<span class="lifetime">'a</span>> { |
| <span class="kw">pub </span>member: syn::Member, |
| <span class="kw">pub </span>attrs: attr::Field, |
| <span class="kw">pub </span>ty: <span class="kw-2">&</span><span class="lifetime">'a </span>syn::Type, |
| <span class="kw">pub </span>original: <span class="kw-2">&</span><span class="lifetime">'a </span>syn::Field, |
| } |
| |
| <span class="attribute">#[derive(Copy, Clone)] |
| </span><span class="kw">pub enum </span>Style { |
| <span class="doccomment">/// Named fields. |
| </span>Struct, |
| <span class="doccomment">/// Many unnamed fields. |
| </span>Tuple, |
| <span class="doccomment">/// One unnamed field. |
| </span>Newtype, |
| <span class="doccomment">/// No fields. |
| </span>Unit, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Container<<span class="lifetime">'a</span>> { |
| <span class="doccomment">/// Convert the raw Syn ast into a parsed container object, collecting errors in `cx`. |
| </span><span class="kw">pub fn </span>from_ast( |
| cx: <span class="kw-2">&</span>Ctxt, |
| item: <span class="kw-2">&</span><span class="lifetime">'a </span>syn::DeriveInput, |
| derive: Derive, |
| ) -> <span class="prelude-ty">Option</span><Container<<span class="lifetime">'a</span>>> { |
| <span class="kw">let </span><span class="kw-2">mut </span>attrs = attr::Container::from_ast(cx, item); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>data = <span class="kw">match </span><span class="kw-2">&</span>item.data { |
| syn::Data::Enum(data) => Data::Enum(enum_from_ast(cx, <span class="kw-2">&</span>data.variants, attrs.default())), |
| syn::Data::Struct(data) => { |
| <span class="kw">let </span>(style, fields) = struct_from_ast(cx, <span class="kw-2">&</span>data.fields, <span class="prelude-val">None</span>, attrs.default()); |
| Data::Struct(style, fields) |
| } |
| syn::Data::Union(<span class="kw">_</span>) => { |
| cx.error_spanned_by(item, <span class="string">"Serde does not support derive for unions"</span>); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| }; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>has_flatten = <span class="bool-val">false</span>; |
| <span class="kw">match </span><span class="kw-2">&mut </span>data { |
| Data::Enum(variants) => { |
| <span class="kw">for </span>variant <span class="kw">in </span>variants { |
| variant.attrs.rename_by_rules(attrs.rename_all_rules()); |
| <span class="kw">for </span>field <span class="kw">in </span><span class="kw-2">&mut </span>variant.fields { |
| <span class="kw">if </span>field.attrs.flatten() { |
| has_flatten = <span class="bool-val">true</span>; |
| } |
| field |
| .attrs |
| .rename_by_rules(variant.attrs.rename_all_rules()); |
| } |
| } |
| } |
| Data::Struct(<span class="kw">_</span>, fields) => { |
| <span class="kw">for </span>field <span class="kw">in </span>fields { |
| <span class="kw">if </span>field.attrs.flatten() { |
| has_flatten = <span class="bool-val">true</span>; |
| } |
| field.attrs.rename_by_rules(attrs.rename_all_rules()); |
| } |
| } |
| } |
| |
| <span class="kw">if </span>has_flatten { |
| attrs.mark_has_flatten(); |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>item = Container { |
| ident: item.ident.clone(), |
| attrs, |
| data, |
| generics: <span class="kw-2">&</span>item.generics, |
| original: item, |
| }; |
| check::check(cx, <span class="kw-2">&mut </span>item, derive); |
| <span class="prelude-val">Some</span>(item) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Data<<span class="lifetime">'a</span>> { |
| <span class="kw">pub fn </span>all_fields(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="self">self</span>) -> Box<Iterator<Item = <span class="kw-2">&</span><span class="lifetime">'a </span>Field<<span class="lifetime">'a</span>>> + <span class="lifetime">'a</span>> { |
| <span class="kw">match </span><span class="self">self </span>{ |
| Data::Enum(variants) => { |
| Box::new(variants.iter().flat_map(|variant| variant.fields.iter())) |
| } |
| Data::Struct(<span class="kw">_</span>, fields) => Box::new(fields.iter()), |
| } |
| } |
| |
| <span class="kw">pub fn </span>has_getter(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.all_fields().any(|f| f.attrs.getter().is_some()) |
| } |
| } |
| |
| <span class="kw">fn </span>enum_from_ast<<span class="lifetime">'a</span>>( |
| cx: <span class="kw-2">&</span>Ctxt, |
| variants: <span class="kw-2">&</span><span class="lifetime">'a </span>Punctuated<syn::Variant, <span class="macro">Token!</span>[,]>, |
| container_default: <span class="kw-2">&</span>attr::Default, |
| ) -> Vec<Variant<<span class="lifetime">'a</span>>> { |
| variants |
| .iter() |
| .map(|variant| { |
| <span class="kw">let </span>attrs = attr::Variant::from_ast(cx, variant); |
| <span class="kw">let </span>(style, fields) = |
| struct_from_ast(cx, <span class="kw-2">&</span>variant.fields, <span class="prelude-val">Some</span>(<span class="kw-2">&</span>attrs), container_default); |
| Variant { |
| ident: variant.ident.clone(), |
| attrs, |
| style, |
| fields, |
| original: variant, |
| } |
| }) |
| .collect() |
| } |
| |
| <span class="kw">fn </span>struct_from_ast<<span class="lifetime">'a</span>>( |
| cx: <span class="kw-2">&</span>Ctxt, |
| fields: <span class="kw-2">&</span><span class="lifetime">'a </span>syn::Fields, |
| attrs: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>attr::Variant>, |
| container_default: <span class="kw-2">&</span>attr::Default, |
| ) -> (Style, Vec<Field<<span class="lifetime">'a</span>>>) { |
| <span class="kw">match </span>fields { |
| syn::Fields::Named(fields) => ( |
| Style::Struct, |
| fields_from_ast(cx, <span class="kw-2">&</span>fields.named, attrs, container_default), |
| ), |
| syn::Fields::Unnamed(fields) <span class="kw">if </span>fields.unnamed.len() == <span class="number">1 </span>=> ( |
| Style::Newtype, |
| fields_from_ast(cx, <span class="kw-2">&</span>fields.unnamed, attrs, container_default), |
| ), |
| syn::Fields::Unnamed(fields) => ( |
| Style::Tuple, |
| fields_from_ast(cx, <span class="kw-2">&</span>fields.unnamed, attrs, container_default), |
| ), |
| syn::Fields::Unit => (Style::Unit, Vec::new()), |
| } |
| } |
| |
| <span class="kw">fn </span>fields_from_ast<<span class="lifetime">'a</span>>( |
| cx: <span class="kw-2">&</span>Ctxt, |
| fields: <span class="kw-2">&</span><span class="lifetime">'a </span>Punctuated<syn::Field, <span class="macro">Token!</span>[,]>, |
| attrs: <span class="prelude-ty">Option</span><<span class="kw-2">&</span>attr::Variant>, |
| container_default: <span class="kw-2">&</span>attr::Default, |
| ) -> Vec<Field<<span class="lifetime">'a</span>>> { |
| fields |
| .iter() |
| .enumerate() |
| .map(|(i, field)| Field { |
| member: <span class="kw">match </span><span class="kw-2">&</span>field.ident { |
| <span class="prelude-val">Some</span>(ident) => syn::Member::Named(ident.clone()), |
| <span class="prelude-val">None </span>=> syn::Member::Unnamed(i.into()), |
| }, |
| attrs: attr::Field::from_ast(cx, i, field, attrs, container_default), |
| ty: <span class="kw-2">&</span>field.ty, |
| original: field, |
| }) |
| .collect() |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../" data-current-crate="serde_derive" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
