| <!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/structopt-derive-0.4.18/src/ty.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>ty.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="../../structopt_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="../../structopt_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">//! Special types handling |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::spanned::Sp; |
| |
| <span class="kw">use </span>syn::{ |
| spanned::Spanned, GenericArgument, Path, PathArguments, PathArguments::AngleBracketed, |
| PathSegment, Type, TypePath, |
| }; |
| |
| <span class="attribute">#[derive(Copy, Clone, PartialEq, Debug)] |
| </span><span class="kw">pub enum </span>Ty { |
| Bool, |
| Vec, |
| <span class="prelude-ty">Option</span>, |
| OptionOption, |
| OptionVec, |
| Other, |
| } |
| |
| <span class="kw">impl </span>Ty { |
| <span class="kw">pub fn </span>from_syn_ty(ty: <span class="kw-2">&</span>syn::Type) -> Sp<<span class="self">Self</span>> { |
| <span class="kw">use </span>Ty::<span class="kw-2">*</span>; |
| <span class="kw">let </span>t = |kind| Sp::new(kind, ty.span()); |
| |
| <span class="kw">if </span>is_simple_ty(ty, <span class="string">"bool"</span>) { |
| t(Bool) |
| } <span class="kw">else if </span>is_generic_ty(ty, <span class="string">"Vec"</span>) { |
| t(Vec) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(subty) = subty_if_name(ty, <span class="string">"Option"</span>) { |
| <span class="kw">if </span>is_generic_ty(subty, <span class="string">"Option"</span>) { |
| t(OptionOption) |
| } <span class="kw">else if </span>is_generic_ty(subty, <span class="string">"Vec"</span>) { |
| t(OptionVec) |
| } <span class="kw">else </span>{ |
| t(<span class="prelude-ty">Option</span>) |
| } |
| } <span class="kw">else </span>{ |
| t(Other) |
| } |
| } |
| } |
| |
| <span class="kw">pub fn </span>sub_type(ty: <span class="kw-2">&</span>syn::Type) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::Type> { |
| subty_if(ty, |<span class="kw">_</span>| <span class="bool-val">true</span>) |
| } |
| |
| <span class="kw">fn </span>only_last_segment(ty: <span class="kw-2">&</span>syn::Type) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>PathSegment> { |
| <span class="kw">match </span>ty { |
| Type::Path(TypePath { |
| qself: <span class="prelude-val">None</span>, |
| path: |
| Path { |
| leading_colon: <span class="prelude-val">None</span>, |
| segments, |
| }, |
| }) => only_one(segments.iter()), |
| |
| <span class="kw">_ </span>=> <span class="prelude-val">None</span>, |
| } |
| } |
| |
| <span class="kw">fn </span>subty_if<F>(ty: <span class="kw-2">&</span>syn::Type, f: F) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>syn::Type> |
| <span class="kw">where |
| </span>F: FnOnce(<span class="kw-2">&</span>PathSegment) -> bool, |
| { |
| <span class="kw">let </span>ty = strip_group(ty); |
| |
| only_last_segment(ty) |
| .filter(|segment| f(segment)) |
| .and_then(|segment| { |
| <span class="kw">if let </span>AngleBracketed(args) = <span class="kw-2">&</span>segment.arguments { |
| only_one(args.args.iter()).and_then(|genneric| { |
| <span class="kw">if let </span>GenericArgument::Type(ty) = genneric { |
| <span class="prelude-val">Some</span>(ty) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| }) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| }) |
| } |
| |
| <span class="kw">pub fn </span>subty_if_name<<span class="lifetime">'a</span>>(ty: <span class="kw-2">&</span><span class="lifetime">'a </span>syn::Type, name: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>syn::Type> { |
| subty_if(ty, |seg| seg.ident == name) |
| } |
| |
| <span class="kw">pub fn </span>is_simple_ty(ty: <span class="kw-2">&</span>syn::Type, name: <span class="kw-2">&</span>str) -> bool { |
| <span class="kw">let </span>ty = strip_group(ty); |
| |
| only_last_segment(ty) |
| .map(|segment| { |
| <span class="kw">if let </span>PathArguments::None = segment.arguments { |
| segment.ident == name |
| } <span class="kw">else </span>{ |
| <span class="bool-val">false |
| </span>} |
| }) |
| .unwrap_or(<span class="bool-val">false</span>) |
| } |
| |
| <span class="comment">// If the struct is placed inside of a macro_rules! declaration, |
| // in some circumstances, the tokens inside will be enclosed |
| // in `proc_macro::Group` delimited by invisible `proc_macro::Delimiter::None`. |
| // |
| // In syn speak, this is encoded via `*::Group` variants. We don't really care about |
| // that, so let's just strip it. |
| // |
| // Details: https://doc.rust-lang.org/proc_macro/enum.Delimiter.html#variant.None |
| // See also: https://github.com/TeXitoi/structopt/issues/439 |
| </span><span class="kw">fn </span>strip_group(<span class="kw-2">mut </span>ty: <span class="kw-2">&</span>syn::Type) -> <span class="kw-2">&</span>syn::Type { |
| <span class="kw">while let </span>Type::Group(group) = ty { |
| ty = <span class="kw-2">&*</span>group.elem; |
| } |
| |
| ty |
| } |
| |
| <span class="kw">fn </span>is_generic_ty(ty: <span class="kw-2">&</span>syn::Type, name: <span class="kw-2">&</span>str) -> bool { |
| subty_if_name(ty, name).is_some() |
| } |
| |
| <span class="kw">fn </span>only_one<I, T>(<span class="kw-2">mut </span>iter: I) -> <span class="prelude-ty">Option</span><T> |
| <span class="kw">where |
| </span>I: Iterator<Item = T>, |
| { |
| iter.next().filter(|<span class="kw">_</span>| iter.next().is_none()) |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="structopt_derive" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
