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<!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/attrs.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>attrs.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="comment">// Copyright 2018 Guillaume Pinot (@TeXitoi) &lt;texitoi@texitoi.eu&gt;
//
// Licensed under the Apache License, Version 2.0 &lt;LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license
// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
</span><span class="kw">use </span><span class="kw">crate</span>::doc_comments::process_doc_comment;
<span class="kw">use crate</span>::{parse::<span class="kw-2">*</span>, spanned::Sp, ty::Ty};
<span class="kw">use </span>std::env;
<span class="kw">use </span>heck::{CamelCase, KebabCase, MixedCase, ShoutySnakeCase, SnakeCase};
<span class="kw">use </span>proc_macro2::{Span, TokenStream};
<span class="kw">use </span>proc_macro_error::abort;
<span class="kw">use </span>quote::{quote, quote_spanned, ToTokens};
<span class="kw">use </span>syn::{
<span class="self">self</span>, ext::IdentExt, spanned::Spanned, Attribute, Expr, Ident, LitStr, MetaNameValue, Type,
};
<span class="attribute">#[derive(Clone)]
</span><span class="kw">pub enum </span>Kind {
Arg(Sp&lt;Ty&gt;),
Subcommand(Sp&lt;Ty&gt;),
ExternalSubcommand,
Flatten,
Skip(<span class="prelude-ty">Option</span>&lt;Expr&gt;),
}
<span class="attribute">#[derive(Clone)]
</span><span class="kw">pub struct </span>Method {
name: Ident,
args: TokenStream,
}
<span class="attribute">#[derive(Clone)]
</span><span class="kw">pub struct </span>Parser {
<span class="kw">pub </span>kind: Sp&lt;ParserKind&gt;,
<span class="kw">pub </span>func: TokenStream,
}
<span class="attribute">#[derive(Debug, PartialEq, Clone)]
</span><span class="kw">pub enum </span>ParserKind {
FromStr,
TryFromStr,
FromOsStr,
TryFromOsStr,
FromOccurrences,
FromFlag,
}
<span class="doccomment">/// Defines the casing for the attributes long representation.
</span><span class="attribute">#[derive(Copy, Clone, Debug, PartialEq)]
</span><span class="kw">pub enum </span>CasingStyle {
<span class="doccomment">/// Indicate word boundaries with uppercase letter, excluding the first word.
</span>Camel,
<span class="doccomment">/// Keep all letters lowercase and indicate word boundaries with hyphens.
</span>Kebab,
<span class="doccomment">/// Indicate word boundaries with uppercase letter, including the first word.
</span>Pascal,
<span class="doccomment">/// Keep all letters uppercase and indicate word boundaries with underscores.
</span>ScreamingSnake,
<span class="doccomment">/// Keep all letters lowercase and indicate word boundaries with underscores.
</span>Snake,
<span class="doccomment">/// Use the original attribute name defined in the code.
</span>Verbatim,
<span class="doccomment">/// Keep all letters lowercase and remove word boundaries.
</span>Lower,
<span class="doccomment">/// Keep all letters uppercase and remove word boundaries.
</span>Upper,
}
<span class="attribute">#[derive(Clone)]
</span><span class="kw">pub enum </span>Name {
Derived(Ident),
Assigned(TokenStream),
}
<span class="attribute">#[derive(Clone)]
</span><span class="kw">pub struct </span>Attrs {
name: Name,
casing: Sp&lt;CasingStyle&gt;,
env_casing: Sp&lt;CasingStyle&gt;,
ty: <span class="prelude-ty">Option</span>&lt;Type&gt;,
doc_comment: Vec&lt;Method&gt;,
methods: Vec&lt;Method&gt;,
parser: Sp&lt;Parser&gt;,
author: <span class="prelude-ty">Option</span>&lt;Method&gt;,
about: <span class="prelude-ty">Option</span>&lt;Method&gt;,
version: <span class="prelude-ty">Option</span>&lt;Method&gt;,
no_version: <span class="prelude-ty">Option</span>&lt;Ident&gt;,
verbatim_doc_comment: <span class="prelude-ty">Option</span>&lt;Ident&gt;,
has_custom_parser: bool,
kind: Sp&lt;Kind&gt;,
}
<span class="kw">impl </span>Method {
<span class="kw">pub fn </span>new(name: Ident, args: TokenStream) -&gt; <span class="self">Self </span>{
Method { name, args }
}
<span class="kw">fn </span>from_lit_or_env(ident: Ident, lit: <span class="prelude-ty">Option</span>&lt;LitStr&gt;, env_var: <span class="kw-2">&amp;</span>str) -&gt; <span class="self">Self </span>{
<span class="kw">let </span><span class="kw-2">mut </span>lit = <span class="kw">match </span>lit {
<span class="prelude-val">Some</span>(lit) =&gt; lit,
<span class="prelude-val">None </span>=&gt; <span class="kw">match </span>env::var(env_var) {
<span class="prelude-val">Ok</span>(val) =&gt; LitStr::new(<span class="kw-2">&amp;</span>val, ident.span()),
<span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; {
<span class="macro">abort!</span>(ident,
<span class="string">&quot;cannot derive `{}` from Cargo.toml&quot;</span>, ident;
note = <span class="string">&quot;`{}` environment variable is not set&quot;</span>, env_var;
help = <span class="string">&quot;use `{} = \&quot;...\&quot;` to set {} manually&quot;</span>, ident, ident;
);
}
},
};
<span class="kw">if </span>ident == <span class="string">&quot;author&quot; </span>{
<span class="kw">let </span>edited = process_author_str(<span class="kw-2">&amp;</span>lit.value());
lit = LitStr::new(<span class="kw-2">&amp;</span>edited, lit.span());
}
Method::new(ident, <span class="macro">quote!</span>(#lit))
}
}
<span class="kw">impl </span>ToTokens <span class="kw">for </span>Method {
<span class="kw">fn </span>to_tokens(<span class="kw-2">&amp;</span><span class="self">self</span>, ts: <span class="kw-2">&amp;mut </span>TokenStream) {
<span class="kw">let </span>Method { <span class="kw-2">ref </span>name, <span class="kw-2">ref </span>args } = <span class="self">self</span>;
<span class="macro">quote!</span>(.#name(#args)).to_tokens(ts);
}
}
<span class="kw">impl </span>Parser {
<span class="kw">fn </span>default_spanned(span: Span) -&gt; Sp&lt;<span class="self">Self</span>&gt; {
<span class="kw">let </span>kind = Sp::new(ParserKind::TryFromStr, span);
<span class="kw">let </span>func = <span class="macro">quote_spanned!</span>(span=&gt; ::std::str::FromStr::from_str);
Sp::new(Parser { kind, func }, span)
}
<span class="kw">fn </span>from_spec(parse_ident: Ident, spec: ParserSpec) -&gt; Sp&lt;<span class="self">Self</span>&gt; {
<span class="kw">use </span>ParserKind::<span class="kw-2">*</span>;
<span class="kw">let </span>kind = <span class="kw">match </span><span class="kw-2">&amp;*</span>spec.kind.to_string() {
<span class="string">&quot;from_str&quot; </span>=&gt; FromStr,
<span class="string">&quot;try_from_str&quot; </span>=&gt; TryFromStr,
<span class="string">&quot;from_os_str&quot; </span>=&gt; FromOsStr,
<span class="string">&quot;try_from_os_str&quot; </span>=&gt; TryFromOsStr,
<span class="string">&quot;from_occurrences&quot; </span>=&gt; FromOccurrences,
<span class="string">&quot;from_flag&quot; </span>=&gt; FromFlag,
s =&gt; <span class="macro">abort!</span>(spec.kind, <span class="string">&quot;unsupported parser `{}`&quot;</span>, s),
};
<span class="kw">let </span>func = <span class="kw">match </span>spec.parse_func {
<span class="prelude-val">None </span>=&gt; <span class="kw">match </span>kind {
FromStr | FromOsStr =&gt; {
<span class="macro">quote_spanned!</span>(spec.kind.span()=&gt; ::std::convert::From::from)
}
TryFromStr =&gt; <span class="macro">quote_spanned!</span>(spec.kind.span()=&gt; ::std::str::FromStr::from_str),
TryFromOsStr =&gt; <span class="macro">abort!</span>(
spec.kind,
<span class="string">&quot;you must set parser for `try_from_os_str` explicitly&quot;
</span>),
FromOccurrences =&gt; <span class="macro">quote_spanned!</span>(spec.kind.span()=&gt; { |v| v <span class="kw">as _ </span>}),
FromFlag =&gt; <span class="macro">quote_spanned!</span>(spec.kind.span()=&gt; ::std::convert::From::from),
},
<span class="prelude-val">Some</span>(func) =&gt; <span class="kw">match </span>func {
syn::Expr::Path(<span class="kw">_</span>) =&gt; <span class="macro">quote!</span>(#func),
<span class="kw">_ </span>=&gt; <span class="macro">abort!</span>(func, <span class="string">&quot;`parse` argument must be a function path&quot;</span>),
},
};
<span class="kw">let </span>kind = Sp::new(kind, spec.kind.span());
<span class="kw">let </span>parser = Parser { kind, func };
Sp::new(parser, parse_ident.span())
}
}
<span class="kw">impl </span>CasingStyle {
<span class="kw">fn </span>from_lit(name: LitStr) -&gt; Sp&lt;<span class="self">Self</span>&gt; {
<span class="kw">use </span>CasingStyle::<span class="kw-2">*</span>;
<span class="kw">let </span>normalized = name.value().to_camel_case().to_lowercase();
<span class="kw">let </span>cs = |kind| Sp::new(kind, name.span());
<span class="kw">match </span>normalized.as_ref() {
<span class="string">&quot;camel&quot; </span>| <span class="string">&quot;camelcase&quot; </span>=&gt; cs(Camel),
<span class="string">&quot;kebab&quot; </span>| <span class="string">&quot;kebabcase&quot; </span>=&gt; cs(Kebab),
<span class="string">&quot;pascal&quot; </span>| <span class="string">&quot;pascalcase&quot; </span>=&gt; cs(Pascal),
<span class="string">&quot;screamingsnake&quot; </span>| <span class="string">&quot;screamingsnakecase&quot; </span>=&gt; cs(ScreamingSnake),
<span class="string">&quot;snake&quot; </span>| <span class="string">&quot;snakecase&quot; </span>=&gt; cs(Snake),
<span class="string">&quot;verbatim&quot; </span>| <span class="string">&quot;verbatimcase&quot; </span>=&gt; cs(Verbatim),
<span class="string">&quot;lower&quot; </span>| <span class="string">&quot;lowercase&quot; </span>=&gt; cs(Lower),
<span class="string">&quot;upper&quot; </span>| <span class="string">&quot;uppercase&quot; </span>=&gt; cs(Upper),
s =&gt; <span class="macro">abort!</span>(name, <span class="string">&quot;unsupported casing: `{}`&quot;</span>, s),
}
}
}
<span class="kw">impl </span>Name {
<span class="kw">pub fn </span>translate(<span class="self">self</span>, style: CasingStyle) -&gt; TokenStream {
<span class="kw">use </span>CasingStyle::<span class="kw-2">*</span>;
<span class="kw">match </span><span class="self">self </span>{
Name::Assigned(tokens) =&gt; tokens,
Name::Derived(ident) =&gt; {
<span class="kw">let </span>s = ident.unraw().to_string();
<span class="kw">let </span>s = <span class="kw">match </span>style {
Pascal =&gt; s.to_camel_case(),
Kebab =&gt; s.to_kebab_case(),
Camel =&gt; s.to_mixed_case(),
ScreamingSnake =&gt; s.to_shouty_snake_case(),
Snake =&gt; s.to_snake_case(),
Verbatim =&gt; s,
Lower =&gt; s.to_snake_case().replace(<span class="string">&quot;_&quot;</span>, <span class="string">&quot;&quot;</span>),
Upper =&gt; s.to_shouty_snake_case().replace(<span class="string">&quot;_&quot;</span>, <span class="string">&quot;&quot;</span>),
};
<span class="macro">quote_spanned!</span>(ident.span()=&gt; #s)
}
}
}
}
<span class="kw">impl </span>Attrs {
<span class="kw">fn </span>new(
default_span: Span,
name: Name,
parent_attrs: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>Attrs&gt;,
ty: <span class="prelude-ty">Option</span>&lt;Type&gt;,
casing: Sp&lt;CasingStyle&gt;,
env_casing: Sp&lt;CasingStyle&gt;,
) -&gt; <span class="self">Self </span>{
<span class="kw">let </span>no_version = parent_attrs
.as_ref()
.map(|attrs| attrs.no_version.clone())
.unwrap_or(<span class="prelude-val">None</span>);
<span class="self">Self </span>{
name,
ty,
casing,
env_casing,
doc_comment: <span class="macro">vec!</span>[],
methods: <span class="macro">vec!</span>[],
parser: Parser::default_spanned(default_span),
about: <span class="prelude-val">None</span>,
author: <span class="prelude-val">None</span>,
version: <span class="prelude-val">None</span>,
no_version,
verbatim_doc_comment: <span class="prelude-val">None</span>,
has_custom_parser: <span class="bool-val">false</span>,
kind: Sp::new(Kind::Arg(Sp::new(Ty::Other, default_span)), default_span),
}
}
<span class="kw">fn </span>push_method(<span class="kw-2">&amp;mut </span><span class="self">self</span>, name: Ident, arg: <span class="kw">impl </span>ToTokens) {
<span class="kw">if </span>name == <span class="string">&quot;name&quot; </span>{
<span class="self">self</span>.name = Name::Assigned(<span class="macro">quote!</span>(#arg));
} <span class="kw">else if </span>name == <span class="string">&quot;version&quot; </span>{
<span class="self">self</span>.version = <span class="prelude-val">Some</span>(Method::new(name, <span class="macro">quote!</span>(#arg)));
} <span class="kw">else </span>{
<span class="self">self</span>.methods.push(Method::new(name, <span class="macro">quote!</span>(#arg)))
}
}
<span class="kw">fn </span>push_attrs(<span class="kw-2">&amp;mut </span><span class="self">self</span>, attrs: <span class="kw-2">&amp;</span>[Attribute]) {
<span class="kw">use </span><span class="kw">crate</span>::parse::StructOptAttr::<span class="kw-2">*</span>;
<span class="kw">for </span>attr <span class="kw">in </span>parse_structopt_attributes(attrs) {
<span class="kw">match </span>attr {
Short(ident) | Long(ident) =&gt; {
<span class="self">self</span>.push_method(ident, <span class="self">self</span>.name.clone().translate(<span class="kw-2">*</span><span class="self">self</span>.casing));
}
Env(ident) =&gt; {
<span class="self">self</span>.push_method(ident, <span class="self">self</span>.name.clone().translate(<span class="kw-2">*</span><span class="self">self</span>.env_casing));
}
Subcommand(ident) =&gt; {
<span class="kw">let </span>ty = Sp::call_site(Ty::Other);
<span class="kw">let </span>kind = Sp::new(Kind::Subcommand(ty), ident.span());
<span class="self">self</span>.set_kind(kind);
}
ExternalSubcommand(ident) =&gt; {
<span class="self">self</span>.kind = Sp::new(Kind::ExternalSubcommand, ident.span());
}
Flatten(ident) =&gt; {
<span class="kw">let </span>kind = Sp::new(Kind::Flatten, ident.span());
<span class="self">self</span>.set_kind(kind);
}
Skip(ident, expr) =&gt; {
<span class="kw">let </span>kind = Sp::new(Kind::Skip(expr), ident.span());
<span class="self">self</span>.set_kind(kind);
}
NoVersion(ident) =&gt; <span class="self">self</span>.no_version = <span class="prelude-val">Some</span>(ident),
VerbatimDocComment(ident) =&gt; <span class="self">self</span>.verbatim_doc_comment = <span class="prelude-val">Some</span>(ident),
DefaultValue(ident, lit) =&gt; {
<span class="kw">let </span>val = <span class="kw">if let </span><span class="prelude-val">Some</span>(lit) = lit {
<span class="macro">quote!</span>(#lit)
} <span class="kw">else </span>{
<span class="kw">let </span>ty = <span class="kw">if let </span><span class="prelude-val">Some</span>(ty) = <span class="self">self</span>.ty.as_ref() {
ty
} <span class="kw">else </span>{
<span class="macro">abort!</span>(
ident,
<span class="string">&quot;#[structopt(default_value)] (without an argument) can be used \
only on field level&quot;</span>;
note = <span class="string">&quot;see \
https://docs.rs/structopt/0.3.5/structopt/#magical-methods&quot;</span>)
};
<span class="macro">quote_spanned!</span>(ident.span()=&gt; {
<span class="macro">::structopt::lazy_static::lazy_static! </span>{
<span class="kw">static </span><span class="kw-2">ref </span>DEFAULT_VALUE: <span class="kw-2">&amp;</span><span class="lifetime">&#39;static </span>str = {
<span class="kw">let </span>val = &lt;#ty <span class="kw">as </span>::std::default::Default&gt;::default();
<span class="kw">let </span>s = ::std::string::ToString::to_string(<span class="kw-2">&amp;</span>val);
::std::boxed::Box::leak(s.into_boxed_str())
};
}
<span class="kw-2">*</span>DEFAULT_VALUE
})
};
<span class="self">self</span>.methods.push(Method::new(ident, val));
}
About(ident, about) =&gt; {
<span class="self">self</span>.about = <span class="prelude-val">Some</span>(Method::from_lit_or_env(
ident,
about,
<span class="string">&quot;CARGO_PKG_DESCRIPTION&quot;</span>,
));
}
Author(ident, author) =&gt; {
<span class="self">self</span>.author = <span class="prelude-val">Some</span>(Method::from_lit_or_env(ident, author, <span class="string">&quot;CARGO_PKG_AUTHORS&quot;</span>));
}
Version(ident, version) =&gt; {
<span class="self">self</span>.push_method(ident, version);
}
NameLitStr(name, lit) =&gt; {
<span class="self">self</span>.push_method(name, lit);
}
NameExpr(name, expr) =&gt; {
<span class="self">self</span>.push_method(name, expr);
}
MethodCall(name, args) =&gt; <span class="self">self</span>.push_method(name, <span class="macro">quote!</span>(#(#args),<span class="kw-2">*</span>)),
RenameAll(<span class="kw">_</span>, casing_lit) =&gt; {
<span class="self">self</span>.casing = CasingStyle::from_lit(casing_lit);
}
RenameAllEnv(<span class="kw">_</span>, casing_lit) =&gt; {
<span class="self">self</span>.env_casing = CasingStyle::from_lit(casing_lit);
}
Parse(ident, spec) =&gt; {
<span class="self">self</span>.has_custom_parser = <span class="bool-val">true</span>;
<span class="self">self</span>.parser = Parser::from_spec(ident, spec);
}
}
}
}
<span class="kw">fn </span>push_doc_comment(<span class="kw-2">&amp;mut </span><span class="self">self</span>, attrs: <span class="kw-2">&amp;</span>[Attribute], name: <span class="kw-2">&amp;</span>str) {
<span class="kw">use </span><span class="kw">crate</span>::Lit::<span class="kw-2">*</span>;
<span class="kw">use </span><span class="kw">crate</span>::Meta::<span class="kw-2">*</span>;
<span class="kw">let </span>comment_parts: Vec&lt;<span class="kw">_</span>&gt; = attrs
.iter()
.filter(|attr| attr.path.is_ident(<span class="string">&quot;doc&quot;</span>))
.filter_map(|attr| {
<span class="kw">if let </span><span class="prelude-val">Ok</span>(NameValue(MetaNameValue { lit: Str(s), .. })) = attr.parse_meta() {
<span class="prelude-val">Some</span>(s.value())
} <span class="kw">else </span>{
<span class="comment">// non #[doc = &quot;...&quot;] attributes are not our concern
// we leave them for rustc to handle
</span><span class="prelude-val">None
</span>}
})
.collect();
<span class="self">self</span>.doc_comment =
process_doc_comment(comment_parts, name, <span class="self">self</span>.verbatim_doc_comment.is_none());
}
<span class="kw">pub fn </span>from_struct(
span: Span,
attrs: <span class="kw-2">&amp;</span>[Attribute],
name: Name,
parent_attrs: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>Attrs&gt;,
argument_casing: Sp&lt;CasingStyle&gt;,
env_casing: Sp&lt;CasingStyle&gt;,
allow_skip: bool,
) -&gt; <span class="self">Self </span>{
<span class="kw">let </span><span class="kw-2">mut </span>res = <span class="self">Self</span>::new(span, name, parent_attrs, <span class="prelude-val">None</span>, argument_casing, env_casing);
res.push_attrs(attrs);
res.push_doc_comment(attrs, <span class="string">&quot;about&quot;</span>);
<span class="kw">if </span>res.has_custom_parser {
<span class="macro">abort!</span>(
res.parser.span(),
<span class="string">&quot;`parse` attribute is only allowed on fields&quot;
</span>);
}
<span class="kw">match </span><span class="kw-2">&amp;*</span>res.kind {
Kind::Subcommand(<span class="kw">_</span>) =&gt; <span class="macro">abort!</span>(res.kind.span(), <span class="string">&quot;subcommand is only allowed on fields&quot;</span>),
Kind::Skip(<span class="kw">_</span>) <span class="kw">if </span>!allow_skip =&gt; {
<span class="macro">abort!</span>(res.kind.span(), <span class="string">&quot;skip is only allowed on fields&quot;</span>)
}
Kind::Arg(<span class="kw">_</span>) | Kind::ExternalSubcommand | Kind::Flatten | Kind::Skip(<span class="kw">_</span>) =&gt; res,
}
}
<span class="kw">pub fn </span>from_field(
field: <span class="kw-2">&amp;</span>syn::Field,
parent_attrs: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>Attrs&gt;,
struct_casing: Sp&lt;CasingStyle&gt;,
env_casing: Sp&lt;CasingStyle&gt;,
) -&gt; <span class="self">Self </span>{
<span class="kw">let </span>name = field.ident.clone().unwrap();
<span class="kw">let </span><span class="kw-2">mut </span>res = <span class="self">Self</span>::new(
field.span(),
Name::Derived(name),
parent_attrs,
<span class="prelude-val">Some</span>(field.ty.clone()),
struct_casing,
env_casing,
);
res.push_attrs(<span class="kw-2">&amp;</span>field.attrs);
res.push_doc_comment(<span class="kw-2">&amp;</span>field.attrs, <span class="string">&quot;help&quot;</span>);
<span class="kw">match </span><span class="kw-2">&amp;*</span>res.kind {
Kind::Flatten =&gt; {
<span class="kw">if </span>res.has_custom_parser {
<span class="macro">abort!</span>(
res.parser.span(),
<span class="string">&quot;parse attribute is not allowed for flattened entry&quot;
</span>);
}
<span class="kw">if </span>res.has_explicit_methods() {
<span class="macro">abort!</span>(
res.kind.span(),
<span class="string">&quot;methods are not allowed for flattened entry&quot;
</span>);
}
<span class="kw">if </span>res.has_doc_methods() {
res.doc_comment = <span class="macro">vec!</span>[];
}
}
Kind::ExternalSubcommand =&gt; {}
Kind::Subcommand(<span class="kw">_</span>) =&gt; {
<span class="kw">if </span>res.has_custom_parser {
<span class="macro">abort!</span>(
res.parser.span(),
<span class="string">&quot;parse attribute is not allowed for subcommand&quot;
</span>);
}
<span class="kw">if </span>res.has_explicit_methods() {
<span class="macro">abort!</span>(
res.kind.span(),
<span class="string">&quot;methods in attributes are not allowed for subcommand&quot;
</span>);
}
<span class="kw">let </span>ty = Ty::from_syn_ty(<span class="kw-2">&amp;</span>field.ty);
<span class="kw">match </span><span class="kw-2">*</span>ty {
Ty::OptionOption =&gt; {
<span class="macro">abort!</span>(
field.ty,
<span class="string">&quot;Option&lt;Option&lt;T&gt;&gt; type is not allowed for subcommand&quot;
</span>);
}
Ty::OptionVec =&gt; {
<span class="macro">abort!</span>(
field.ty,
<span class="string">&quot;Option&lt;Vec&lt;T&gt;&gt; type is not allowed for subcommand&quot;
</span>);
}
<span class="kw">_ </span>=&gt; (),
}
res.kind = Sp::new(Kind::Subcommand(ty), res.kind.span());
}
Kind::Skip(<span class="kw">_</span>) =&gt; {
<span class="kw">if </span>res.has_explicit_methods() {
<span class="macro">abort!</span>(
res.kind.span(),
<span class="string">&quot;methods are not allowed for skipped fields&quot;
</span>);
}
}
Kind::Arg(orig_ty) =&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>ty = Ty::from_syn_ty(<span class="kw-2">&amp;</span>field.ty);
<span class="kw">if </span>res.has_custom_parser {
<span class="kw">match </span><span class="kw-2">*</span>ty {
Ty::Option | Ty::Vec | Ty::OptionVec =&gt; (),
<span class="kw">_ </span>=&gt; ty = Sp::new(Ty::Other, ty.span()),
}
}
<span class="kw">match </span><span class="kw-2">*</span>ty {
Ty::Bool =&gt; {
<span class="kw">if </span>res.is_positional() &amp;&amp; !res.has_custom_parser {
<span class="macro">abort!</span>(field.ty,
<span class="string">&quot;`bool` cannot be used as positional parameter with default parser&quot;</span>;
help = <span class="string">&quot;if you want to create a flag add `long` or `short`&quot;</span>;
help = <span class="string">&quot;If you really want a boolean parameter \
add an explicit parser, for example `parse(try_from_str)`&quot;</span>;
note = <span class="string">&quot;see also https://github.com/TeXitoi/structopt/tree/master/examples/true_or_false.rs&quot;</span>;
)
}
<span class="kw">if let </span><span class="prelude-val">Some</span>(m) = res.find_method(<span class="string">&quot;default_value&quot;</span>) {
<span class="macro">abort!</span>(m.name, <span class="string">&quot;default_value is meaningless for bool&quot;</span>)
}
<span class="kw">if let </span><span class="prelude-val">Some</span>(m) = res.find_method(<span class="string">&quot;required&quot;</span>) {
<span class="macro">abort!</span>(m.name, <span class="string">&quot;required is meaningless for bool&quot;</span>)
}
}
Ty::Option =&gt; {
<span class="kw">if let </span><span class="prelude-val">Some</span>(m) = res.find_method(<span class="string">&quot;default_value&quot;</span>) {
<span class="macro">abort!</span>(m.name, <span class="string">&quot;default_value is meaningless for Option&quot;</span>)
}
<span class="kw">if let </span><span class="prelude-val">Some</span>(m) = res.find_method(<span class="string">&quot;required&quot;</span>) {
<span class="macro">abort!</span>(m.name, <span class="string">&quot;required is meaningless for Option&quot;</span>)
}
}
Ty::OptionOption =&gt; {
<span class="kw">if </span>res.is_positional() {
<span class="macro">abort!</span>(
field.ty,
<span class="string">&quot;Option&lt;Option&lt;T&gt;&gt; type is meaningless for positional argument&quot;
</span>)
}
}
Ty::OptionVec =&gt; {
<span class="kw">if </span>res.is_positional() {
<span class="macro">abort!</span>(
field.ty,
<span class="string">&quot;Option&lt;Vec&lt;T&gt;&gt; type is meaningless for positional argument&quot;
</span>)
}
}
<span class="kw">_ </span>=&gt; (),
}
res.kind = Sp::new(Kind::Arg(ty), orig_ty.span());
}
}
res
}
<span class="kw">fn </span>set_kind(<span class="kw-2">&amp;mut </span><span class="self">self</span>, kind: Sp&lt;Kind&gt;) {
<span class="kw">if let </span>Kind::Arg(<span class="kw">_</span>) = <span class="kw-2">*</span><span class="self">self</span>.kind {
<span class="self">self</span>.kind = kind;
} <span class="kw">else </span>{
<span class="macro">abort!</span>(
kind.span(),
<span class="string">&quot;subcommand, flatten and skip cannot be used together&quot;
</span>);
}
}
<span class="kw">pub fn </span>has_method(<span class="kw-2">&amp;</span><span class="self">self</span>, name: <span class="kw-2">&amp;</span>str) -&gt; bool {
<span class="self">self</span>.find_method(name).is_some()
}
<span class="kw">pub fn </span>find_method(<span class="kw-2">&amp;</span><span class="self">self</span>, name: <span class="kw-2">&amp;</span>str) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>Method&gt; {
<span class="self">self</span>.methods.iter().find(|m| m.name == name)
}
<span class="doccomment">/// generate methods from attributes on top of struct or enum
</span><span class="kw">pub fn </span>top_level_methods(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
<span class="kw">let </span>author = <span class="kw-2">&amp;</span><span class="self">self</span>.author;
<span class="kw">let </span>about = <span class="kw-2">&amp;</span><span class="self">self</span>.about;
<span class="kw">let </span>methods = <span class="kw-2">&amp;</span><span class="self">self</span>.methods;
<span class="kw">let </span>doc_comment = <span class="kw-2">&amp;</span><span class="self">self</span>.doc_comment;
<span class="macro">quote!</span>( #(#doc_comment)* #author #about #(#methods)* )
}
<span class="doccomment">/// generate methods on top of a field
</span><span class="kw">pub fn </span>field_methods(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
<span class="kw">let </span>methods = <span class="kw-2">&amp;</span><span class="self">self</span>.methods;
<span class="kw">let </span>doc_comment = <span class="kw-2">&amp;</span><span class="self">self</span>.doc_comment;
<span class="macro">quote!</span>( #(#doc_comment)* #(#methods)* )
}
<span class="kw">pub fn </span>version(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
<span class="kw">match </span>(<span class="kw-2">&amp;</span><span class="self">self</span>.no_version, <span class="kw-2">&amp;</span><span class="self">self</span>.version) {
(<span class="prelude-val">None</span>, <span class="prelude-val">Some</span>(m)) =&gt; m.to_token_stream(),
(<span class="prelude-val">None</span>, <span class="prelude-val">None</span>) =&gt; std::env::var(<span class="string">&quot;CARGO_PKG_VERSION&quot;</span>)
.map(|version| <span class="macro">quote!</span>( .version(#version) ))
.unwrap_or_default(),
<span class="kw">_ </span>=&gt; <span class="macro">quote!</span>(),
}
}
<span class="kw">pub fn </span>cased_name(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; TokenStream {
<span class="self">self</span>.name.clone().translate(<span class="kw-2">*</span><span class="self">self</span>.casing)
}
<span class="kw">pub fn </span>parser(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>Sp&lt;Parser&gt; {
<span class="kw-2">&amp;</span><span class="self">self</span>.parser
}
<span class="kw">pub fn </span>kind(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Sp&lt;Kind&gt; {
<span class="self">self</span>.kind.clone()
}
<span class="kw">pub fn </span>casing(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Sp&lt;CasingStyle&gt; {
<span class="self">self</span>.casing.clone()
}
<span class="kw">pub fn </span>env_casing(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; Sp&lt;CasingStyle&gt; {
<span class="self">self</span>.env_casing.clone()
}
<span class="kw">pub fn </span>is_positional(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.methods
.iter()
.all(|m| m.name != <span class="string">&quot;long&quot; </span>&amp;&amp; m.name != <span class="string">&quot;short&quot;</span>)
}
<span class="kw">pub fn </span>has_explicit_methods(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
<span class="self">self</span>.methods
.iter()
.any(|m| m.name != <span class="string">&quot;help&quot; </span>&amp;&amp; m.name != <span class="string">&quot;long_help&quot;</span>)
}
<span class="kw">pub fn </span>has_doc_methods(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
!<span class="self">self</span>.doc_comment.is_empty()
|| <span class="self">self</span>.methods.iter().any(|m| {
m.name == <span class="string">&quot;help&quot;
</span>|| m.name == <span class="string">&quot;long_help&quot;
</span>|| m.name == <span class="string">&quot;about&quot;
</span>|| m.name == <span class="string">&quot;long_about&quot;
</span>})
}
}
<span class="doccomment">/// replace all `:` with `, ` when not inside the `&lt;&gt;`
///
/// `&quot;author1:author2:author3&quot; =&gt; &quot;author1, author2, author3&quot;`
/// `&quot;author1 &lt;http://website1.com&gt;:author2&quot; =&gt; &quot;author1 &lt;http://website1.com&gt;, author2&quot;
</span><span class="kw">fn </span>process_author_str(author: <span class="kw-2">&amp;</span>str) -&gt; String {
<span class="kw">let </span><span class="kw-2">mut </span>res = String::with_capacity(author.len());
<span class="kw">let </span><span class="kw-2">mut </span>inside_angle_braces = <span class="number">0usize</span>;
<span class="kw">for </span>ch <span class="kw">in </span>author.chars() {
<span class="kw">if </span>inside_angle_braces &gt; <span class="number">0 </span>&amp;&amp; ch == <span class="string">&#39;&gt;&#39; </span>{
inside_angle_braces -= <span class="number">1</span>;
res.push(ch);
} <span class="kw">else if </span>ch == <span class="string">&#39;&lt;&#39; </span>{
inside_angle_braces += <span class="number">1</span>;
res.push(ch);
} <span class="kw">else if </span>inside_angle_braces == <span class="number">0 </span>&amp;&amp; ch == <span class="string">&#39;:&#39; </span>{
res.push_str(<span class="string">&quot;, &quot;</span>);
} <span class="kw">else </span>{
res.push(ch);
}
}
res
}
</code></pre></div>
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