| <!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/parse.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>parse.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="kw">use </span>std::iter::FromIterator; |
| |
| <span class="kw">use </span>proc_macro_error::{abort, ResultExt}; |
| <span class="kw">use </span>quote::ToTokens; |
| <span class="kw">use </span>syn::{ |
| <span class="self">self</span>, parenthesized, |
| parse::{Parse, ParseBuffer, ParseStream}, |
| punctuated::Punctuated, |
| Attribute, Expr, ExprLit, Ident, Lit, LitBool, LitStr, Token, |
| }; |
| |
| <span class="kw">pub enum </span>StructOptAttr { |
| <span class="comment">// single-identifier attributes |
| </span>Short(Ident), |
| Long(Ident), |
| Env(Ident), |
| Flatten(Ident), |
| Subcommand(Ident), |
| ExternalSubcommand(Ident), |
| NoVersion(Ident), |
| VerbatimDocComment(Ident), |
| |
| <span class="comment">// ident [= "string literal"] |
| </span>About(Ident, <span class="prelude-ty">Option</span><LitStr>), |
| Author(Ident, <span class="prelude-ty">Option</span><LitStr>), |
| DefaultValue(Ident, <span class="prelude-ty">Option</span><LitStr>), |
| |
| <span class="comment">// ident = "string literal" |
| </span>Version(Ident, LitStr), |
| RenameAllEnv(Ident, LitStr), |
| RenameAll(Ident, LitStr), |
| NameLitStr(Ident, LitStr), |
| |
| <span class="comment">// parse(parser_kind [= parser_func]) |
| </span>Parse(Ident, ParserSpec), |
| |
| <span class="comment">// ident [= arbitrary_expr] |
| </span>Skip(Ident, <span class="prelude-ty">Option</span><Expr>), |
| |
| <span class="comment">// ident = arbitrary_expr |
| </span>NameExpr(Ident, Expr), |
| |
| <span class="comment">// ident(arbitrary_expr,*) |
| </span>MethodCall(Ident, Vec<Expr>), |
| } |
| |
| <span class="kw">impl </span>Parse <span class="kw">for </span>StructOptAttr { |
| <span class="kw">fn </span>parse(input: ParseStream<<span class="lifetime">'_</span>>) -> syn::Result<<span class="self">Self</span>> { |
| <span class="kw">use </span><span class="self">self</span>::StructOptAttr::<span class="kw-2">*</span>; |
| |
| <span class="kw">let </span>name: Ident = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>name_str = name.to_string(); |
| |
| <span class="kw">if </span>input.peek(<span class="macro">Token!</span>[=]) { |
| <span class="comment">// `name = value` attributes. |
| </span><span class="kw">let </span>assign_token = input.parse::<<span class="macro">Token!</span>[=]>()<span class="question-mark">?</span>; <span class="comment">// skip '=' |
| |
| </span><span class="kw">if </span>input.peek(LitStr) { |
| <span class="kw">let </span>lit: LitStr = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>lit_str = lit.value(); |
| |
| <span class="kw">let </span>check_empty_lit = |s| { |
| <span class="kw">if </span>lit_str.is_empty() { |
| <span class="macro">abort!</span>( |
| lit, |
| <span class="string">"`#[structopt({} = \"\")]` is deprecated in structopt 0.3, \ |
| now it's default behavior"</span>, |
| s |
| ); |
| } |
| }; |
| |
| <span class="kw">match </span><span class="kw-2">&*</span>name_str { |
| <span class="string">"rename_all" </span>=> <span class="prelude-val">Ok</span>(RenameAll(name, lit)), |
| <span class="string">"rename_all_env" </span>=> <span class="prelude-val">Ok</span>(RenameAllEnv(name, lit)), |
| <span class="string">"default_value" </span>=> <span class="prelude-val">Ok</span>(DefaultValue(name, <span class="prelude-val">Some</span>(lit))), |
| |
| <span class="string">"version" </span>=> { |
| check_empty_lit(<span class="string">"version"</span>); |
| <span class="prelude-val">Ok</span>(Version(name, lit)) |
| } |
| |
| <span class="string">"author" </span>=> { |
| check_empty_lit(<span class="string">"author"</span>); |
| <span class="prelude-val">Ok</span>(Author(name, <span class="prelude-val">Some</span>(lit))) |
| } |
| |
| <span class="string">"about" </span>=> { |
| check_empty_lit(<span class="string">"about"</span>); |
| <span class="prelude-val">Ok</span>(About(name, <span class="prelude-val">Some</span>(lit))) |
| } |
| |
| <span class="string">"skip" </span>=> { |
| <span class="kw">let </span>expr = ExprLit { |
| attrs: <span class="macro">vec!</span>[], |
| lit: Lit::Str(lit), |
| }; |
| <span class="kw">let </span>expr = Expr::Lit(expr); |
| <span class="prelude-val">Ok</span>(Skip(name, <span class="prelude-val">Some</span>(expr))) |
| } |
| |
| <span class="kw">_ </span>=> <span class="prelude-val">Ok</span>(NameLitStr(name, lit)), |
| } |
| } <span class="kw">else </span>{ |
| <span class="kw">match </span>input.parse::<Expr>() { |
| <span class="prelude-val">Ok</span>(expr) => { |
| <span class="kw">if </span>name_str == <span class="string">"skip" </span>{ |
| <span class="prelude-val">Ok</span>(Skip(name, <span class="prelude-val">Some</span>(expr))) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">Ok</span>(NameExpr(name, expr)) |
| } |
| } |
| |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="macro">abort! </span>{ |
| assign_token, |
| <span class="string">"expected `string literal` or `expression` after `=`" |
| </span>}, |
| } |
| } |
| } <span class="kw">else if </span>input.peek(syn::token::Paren) { |
| <span class="comment">// `name(...)` attributes. |
| </span><span class="kw">let </span>nested; |
| <span class="macro">parenthesized!</span>(nested <span class="kw">in </span>input); |
| |
| <span class="kw">match </span>name_str.as_ref() { |
| <span class="string">"parse" </span>=> { |
| <span class="kw">let </span>parser_specs: Punctuated<ParserSpec, <span class="macro">Token!</span>[,]> = |
| nested.parse_terminated(ParserSpec::parse)<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>parser_specs.len() == <span class="number">1 </span>{ |
| <span class="prelude-val">Ok</span>(Parse(name, parser_specs[<span class="number">0</span>].clone())) |
| } <span class="kw">else </span>{ |
| <span class="macro">abort!</span>(name, <span class="string">"`parse` must have exactly one argument"</span>) |
| } |
| } |
| |
| <span class="string">"raw" </span>=> <span class="kw">match </span>nested.parse::<LitBool>() { |
| <span class="prelude-val">Ok</span>(bool_token) => { |
| <span class="kw">let </span>expr = ExprLit { |
| attrs: <span class="macro">vec!</span>[], |
| lit: Lit::Bool(bool_token), |
| }; |
| <span class="kw">let </span>expr = Expr::Lit(expr); |
| <span class="prelude-val">Ok</span>(MethodCall(name, <span class="macro">vec!</span>[expr])) |
| } |
| |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => { |
| <span class="macro">abort!</span>(name, |
| <span class="string">"`#[structopt(raw(...))` attributes are removed in structopt 0.3, \ |
| they are replaced with raw methods"</span>; |
| help = <span class="string">"if you meant to call `clap::Arg::raw()` method \ |
| you should use bool literal, like `raw(true)` or `raw(false)`"</span>; |
| note = raw_method_suggestion(nested); |
| ); |
| } |
| }, |
| |
| <span class="kw">_ </span>=> { |
| <span class="kw">let </span>method_args: Punctuated<<span class="kw">_</span>, <span class="macro">Token!</span>[,]> = |
| nested.parse_terminated(Expr::parse)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(MethodCall(name, Vec::from_iter(method_args))) |
| } |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// Attributes represented with a sole identifier. |
| </span><span class="kw">match </span>name_str.as_ref() { |
| <span class="string">"long" </span>=> <span class="prelude-val">Ok</span>(Long(name)), |
| <span class="string">"short" </span>=> <span class="prelude-val">Ok</span>(Short(name)), |
| <span class="string">"env" </span>=> <span class="prelude-val">Ok</span>(Env(name)), |
| <span class="string">"flatten" </span>=> <span class="prelude-val">Ok</span>(Flatten(name)), |
| <span class="string">"subcommand" </span>=> <span class="prelude-val">Ok</span>(Subcommand(name)), |
| <span class="string">"external_subcommand" </span>=> <span class="prelude-val">Ok</span>(ExternalSubcommand(name)), |
| <span class="string">"no_version" </span>=> <span class="prelude-val">Ok</span>(NoVersion(name)), |
| <span class="string">"verbatim_doc_comment" </span>=> <span class="prelude-val">Ok</span>(VerbatimDocComment(name)), |
| |
| <span class="string">"default_value" </span>=> <span class="prelude-val">Ok</span>(DefaultValue(name, <span class="prelude-val">None</span>)), |
| <span class="string">"about" </span>=> (<span class="prelude-val">Ok</span>(About(name, <span class="prelude-val">None</span>))), |
| <span class="string">"author" </span>=> (<span class="prelude-val">Ok</span>(Author(name, <span class="prelude-val">None</span>))), |
| |
| <span class="string">"skip" </span>=> <span class="prelude-val">Ok</span>(Skip(name, <span class="prelude-val">None</span>)), |
| |
| <span class="string">"version" </span>=> <span class="macro">abort!</span>( |
| name, |
| <span class="string">"#[structopt(version)] is invalid attribute, \ |
| structopt 0.3 inherits version from Cargo.toml by default, \ |
| no attribute needed" |
| </span>), |
| |
| <span class="kw">_ </span>=> <span class="macro">abort!</span>(name, <span class="string">"unexpected attribute: {}"</span>, name_str), |
| } |
| } |
| } |
| } |
| |
| <span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>ParserSpec { |
| <span class="kw">pub </span>kind: Ident, |
| <span class="kw">pub </span>eq_token: <span class="prelude-ty">Option</span><<span class="macro">Token!</span>[=]>, |
| <span class="kw">pub </span>parse_func: <span class="prelude-ty">Option</span><Expr>, |
| } |
| |
| <span class="kw">impl </span>Parse <span class="kw">for </span>ParserSpec { |
| <span class="kw">fn </span>parse(input: ParseStream<<span class="lifetime">'_</span>>) -> syn::Result<<span class="self">Self</span>> { |
| <span class="kw">let </span>kind = input |
| .parse() |
| .map_err(|<span class="kw">_</span>| input.error(<span class="string">"parser specification must start with identifier"</span>))<span class="question-mark">?</span>; |
| <span class="kw">let </span>eq_token = input.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>parse_func = <span class="kw">match </span>eq_token { |
| <span class="prelude-val">None </span>=> <span class="prelude-val">None</span>, |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => <span class="prelude-val">Some</span>(input.parse()<span class="question-mark">?</span>), |
| }; |
| <span class="prelude-val">Ok</span>(ParserSpec { |
| kind, |
| eq_token, |
| parse_func, |
| }) |
| } |
| } |
| |
| <span class="kw">fn </span>raw_method_suggestion(ts: ParseBuffer) -> String { |
| <span class="kw">let </span>do_parse = <span class="kw">move </span>|| -> <span class="prelude-ty">Result</span><(Ident, Punctuated<Expr, <span class="macro">Token!</span>[,]>), syn::Error> { |
| <span class="kw">let </span>name = ts.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>_eq: <span class="macro">Token!</span>[=] = ts.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>val: LitStr = ts.parse()<span class="question-mark">?</span>; |
| <span class="kw">let </span>exprs = val.parse_with(Punctuated::<Expr, <span class="macro">Token!</span>[,]>::parse_terminated)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>((name, exprs)) |
| }; |
| |
| <span class="kw">fn </span>to_string<T: ToTokens>(val: <span class="kw-2">&</span>T) -> String { |
| val.to_token_stream() |
| .to_string() |
| .replace(<span class="string">" "</span>, <span class="string">""</span>) |
| .replace(<span class="string">","</span>, <span class="string">", "</span>) |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Ok</span>((name, exprs)) = do_parse() { |
| <span class="kw">let </span>suggestion = <span class="kw">if </span>exprs.len() == <span class="number">1 </span>{ |
| <span class="kw">let </span>val = to_string(<span class="kw-2">&</span>exprs[<span class="number">0</span>]); |
| <span class="macro">format!</span>(<span class="string">" = {}"</span>, val) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>val = exprs |
| .into_iter() |
| .map(|expr| to_string(<span class="kw-2">&</span>expr)) |
| .collect::<Vec<<span class="kw">_</span>>>() |
| .join(<span class="string">", "</span>); |
| |
| <span class="macro">format!</span>(<span class="string">"({})"</span>, val) |
| }; |
| |
| <span class="macro">format!</span>( |
| <span class="string">"if you need to call `clap::Arg/App::{}` method you \ |
| can do it like this: #[structopt({}{})]"</span>, |
| name, name, suggestion |
| ) |
| } <span class="kw">else </span>{ |
| <span class="string">"if you need to call some method from `clap::Arg/App` \ |
| you should use raw method, see \ |
| https://docs.rs/structopt/0.3/structopt/#raw-methods" |
| </span>.into() |
| } |
| } |
| |
| <span class="kw">pub fn </span>parse_structopt_attributes(all_attrs: <span class="kw-2">&</span>[Attribute]) -> Vec<StructOptAttr> { |
| all_attrs |
| .iter() |
| .filter(|attr| attr.path.is_ident(<span class="string">"structopt"</span>)) |
| .flat_map(|attr| { |
| attr.parse_args_with(Punctuated::<StructOptAttr, <span class="macro">Token!</span>[,]>::parse_terminated) |
| .unwrap_or_abort() |
| }) |
| .collect() |
| } |
| </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> |
