edg-l/edlang
1
1
Fork 0
mirror of https://github.com/edg-l/edlang.git synced 2024-11-14 20:18:24 +00:00
Code Issues Packages Projects Releases Wiki Activity
edlang/clap_lex/index.html
edg-l 1e59f5fc1b deploy: 5e40306951
2024-04-09 10:18:33 +00:00

109 lines
12 KiB
HTML
Raw Blame History

This file contains ambiguous Unicode characters

This file contains Unicode characters that might be confused with other characters. If you think that this is intentional, you can safely ignore this warning. Use the Escape button to reveal them.

<!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="Minimal, flexible command-line parser"><title>clap_lex - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceSerif4-Regular-46f98efaafac5295.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Regular-018c141bf0843ffd.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/FiraSans-Medium-8f9a781e4970d388.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2"><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-5bc39a1768837dd0.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="clap_lex" data-themes="" data-resource-suffix="" data-rustdoc-version="1.77.1 (7cf61ebde 2024-03-27)" data-channel="1.77.1" data-search-js="search-dd67cee4cfa65049.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-4c98445ec4002617.js"></script><script defer src="../crates.js"></script><script defer src="../static.files/main-48f368f3872407c8.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-04d5337699b92874.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-16x16-8b506e7a72182f1c.png"><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod crate"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../clap_lex/index.html">clap_lex</a><span class="version">0.7.0</span></h2></div><div class="sidebar-elems"><ul class="block">
<li><a id="all-types" href="all.html">All Items</a></li></ul><section><ul class="block"><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li></ul></section></div></nav><div class="sidebar-resizer"></div>
<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../clap_lex/all.html" title="show sidebar"></a></div><input class="search-input" name="search" aria-label="Run search in the documentation" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" tabindex="-1"><a href="../help.html" title="help">?</a></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../static.files/wheel-7b819b6101059cd0.svg"></a></div></form></nav><section id="main-content" class="content"><div class="main-heading"><h1>Crate <a class="mod" href="#">clap_lex</a><button id="copy-path" title="Copy item path to clipboard"><img src="../static.files/clipboard-7571035ce49a181d.svg" width="19" height="18" alt="Copy item path"></button></h1><span class="out-of-band"><a class="src" href="../src/clap_lex/lib.rs.html#1-505">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Minimal, flexible command-line parser</p>
<p>As opposed to a declarative parser, this processes arguments as a stream of tokens. As lexing
a command-line is not context-free, we rely on the caller to decide how to interpret the
arguments.</p>
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::path::PathBuf;
<span class="kw">use </span>std::ffi::OsStr;
<span class="kw">type </span>BoxedError = Box&lt;<span class="kw">dyn </span>std::error::Error + Send + Sync&gt;;
<span class="attr">#[derive(Debug)]
</span><span class="kw">struct </span>Args {
paths: Vec&lt;PathBuf&gt;,
color: Color,
verbosity: usize,
}
<span class="attr">#[derive(Debug)]
</span><span class="kw">enum </span>Color {
Always,
Auto,
Never,
}
<span class="kw">impl </span>Color {
<span class="kw">fn </span>parse(s: <span class="prelude-ty">Option</span>&lt;<span class="kw-2">&amp;</span>OsStr&gt;) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, BoxedError&gt; {
<span class="kw">let </span>s = s.map(|s| s.to_str().ok_or(s));
<span class="kw">match </span>s {
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="string">"always"</span>)) | <span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="string">""</span>)) | <span class="prelude-val">None </span>=&gt; {
<span class="prelude-val">Ok</span>(Color::Always)
}
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="string">"auto"</span>)) =&gt; {
<span class="prelude-val">Ok</span>(Color::Auto)
}
<span class="prelude-val">Some</span>(<span class="prelude-val">Ok</span>(<span class="string">"never"</span>)) =&gt; {
<span class="prelude-val">Ok</span>(Color::Never)
}
<span class="prelude-val">Some</span>(invalid) =&gt; {
<span class="prelude-val">Err</span>(<span class="macro">format!</span>(<span class="string">"Invalid value for `--color`, {invalid:?}"</span>).into())
}
}
}
}
<span class="kw">fn </span>parse_args(
raw: <span class="kw">impl </span>IntoIterator&lt;Item=<span class="kw">impl </span>Into&lt;std::ffi::OsString&gt;&gt;
) -&gt; <span class="prelude-ty">Result</span>&lt;Args, BoxedError&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>args = Args {
paths: Vec::new(),
color: Color::Auto,
verbosity: <span class="number">0</span>,
};
<span class="kw">let </span>raw = clap_lex::RawArgs::new(raw);
<span class="kw">let </span><span class="kw-2">mut </span>cursor = raw.cursor();
raw.next(<span class="kw-2">&amp;mut </span>cursor); <span class="comment">// Skip the bin
</span><span class="kw">while let </span><span class="prelude-val">Some</span>(arg) = raw.next(<span class="kw-2">&amp;mut </span>cursor) {
<span class="kw">if </span>arg.is_escape() {
args.paths.extend(raw.remaining(<span class="kw-2">&amp;mut </span>cursor).map(PathBuf::from));
} <span class="kw">else if </span>arg.is_stdio() {
args.paths.push(PathBuf::from(<span class="string">"-"</span>));
} <span class="kw">else if let </span><span class="prelude-val">Some</span>((long, value)) = arg.to_long() {
<span class="kw">match </span>long {
<span class="prelude-val">Ok</span>(<span class="string">"verbose"</span>) =&gt; {
<span class="kw">if let </span><span class="prelude-val">Some</span>(value) = value {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">format!</span>(<span class="string">"`--verbose` does not take a value, got `{value:?}`"</span>).into());
}
args.verbosity += <span class="number">1</span>;
}
<span class="prelude-val">Ok</span>(<span class="string">"color"</span>) =&gt; {
args.color = Color::parse(value)<span class="question-mark">?</span>;
}
<span class="kw">_ </span>=&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(
<span class="macro">format!</span>(<span class="string">"Unexpected flag: --{}"</span>, arg.display()).into()
);
}
}
} <span class="kw">else if let </span><span class="prelude-val">Some</span>(<span class="kw-2">mut </span>shorts) = arg.to_short() {
<span class="kw">while let </span><span class="prelude-val">Some</span>(short) = shorts.next_flag() {
<span class="kw">match </span>short {
<span class="prelude-val">Ok</span>(<span class="string">'v'</span>) =&gt; {
args.verbosity += <span class="number">1</span>;
}
<span class="prelude-val">Ok</span>(<span class="string">'c'</span>) =&gt; {
<span class="kw">let </span>value = shorts.next_value_os();
args.color = Color::parse(value)<span class="question-mark">?</span>;
}
<span class="prelude-val">Ok</span>(c) =&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">format!</span>(<span class="string">"Unexpected flag: -{c}"</span>).into());
}
<span class="prelude-val">Err</span>(e) =&gt; {
<span class="kw">return </span><span class="prelude-val">Err</span>(<span class="macro">format!</span>(<span class="string">"Unexpected flag: -{}"</span>, e.to_string_lossy()).into());
}
}
}
} <span class="kw">else </span>{
args.paths.push(PathBuf::from(arg.to_value_os().to_owned()));
}
}
<span class="prelude-val">Ok</span>(args)
}
<span class="kw">let </span>args = parse_args([<span class="string">"bin"</span>, <span class="string">"--hello"</span>, <span class="string">"world"</span>]);
<span class="macro">println!</span>(<span class="string">"{args:?}"</span>);</code></pre></div>
</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.ArgCursor.html" title="struct clap_lex::ArgCursor">ArgCursor</a></div><div class="desc docblock-short">Position within <a href="struct.RawArgs.html" title="struct clap_lex::RawArgs"><code>RawArgs</code></a></div></li><li><div class="item-name"><a class="struct" href="struct.ParsedArg.html" title="struct clap_lex::ParsedArg">ParsedArg</a></div><div class="desc docblock-short">Command-line Argument</div></li><li><div class="item-name"><a class="struct" href="struct.RawArgs.html" title="struct clap_lex::RawArgs">RawArgs</a></div><div class="desc docblock-short">Command-line arguments</div></li><li><div class="item-name"><a class="struct" href="struct.ShortFlags.html" title="struct clap_lex::ShortFlags">ShortFlags</a></div><div class="desc docblock-short">Walk through short flags within a <a href="struct.ParsedArg.html" title="struct clap_lex::ParsedArg"><code>ParsedArg</code></a></div></li></ul><h2 id="enums" class="section-header">Enums<a href="#enums" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="enum" href="enum.SeekFrom.html" title="enum clap_lex::SeekFrom">SeekFrom</a></div><div class="desc docblock-short">Enumeration of possible methods to seek within an I/O object.</div></li></ul><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.OsStrExt.html" title="trait clap_lex::OsStrExt">OsStrExt</a></div></li></ul></section></div></main></body></html>
Reference in a new issue View git blame Copy permalink