156 lines
8.4 KiB
HTML
156 lines
8.4 KiB
HTML
|
<!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="API documentation for the Rust `opt_vec` macro in crate `synom`.">
|
|||
|
|
<meta name="keywords" content="rust, rustlang, rust-lang, opt_vec">
|
|||
|
|
|
|||
|
|
<title>synom::opt_vec - Rust</title>
|
|||
|
|
|
|||
|
|
<link rel="stylesheet" type="text/css" href="../normalize.css">
|
|||
|
|
<link rel="stylesheet" type="text/css" href="../rustdoc.css">
|
|||
|
|
<link rel="stylesheet" type="text/css" href="../main.css">
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
</head>
|
|||
|
|
<body class="rustdoc macro">
|
|||
|
|
<!--[if lte IE 8]>
|
|||
|
|
<div class="warning">
|
|||
|
|
This old browser is unsupported and will most likely display funky
|
|||
|
|
things.
|
|||
|
|
</div>
|
|||
|
|
<![endif]-->
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<nav class="sidebar">
|
|||
|
|
|
|||
|
|
<p class='location'><a href='index.html'>synom</a></p><script>window.sidebarCurrent = {name: 'opt_vec', ty: 'macro', relpath: ''};</script><script defer src="sidebar-items.js"></script>
|
|||
|
|
</nav>
|
|||
|
|
|
|||
|
|
<nav class="sub">
|
|||
|
|
<form class="search-form js-only">
|
|||
|
|
<div class="search-container">
|
|||
|
|
<input class="search-input" name="search"
|
|||
|
|
autocomplete="off"
|
|||
|
|
placeholder="Click or press ‘S’ to search, ‘?’ for more options…"
|
|||
|
|
type="search">
|
|||
|
|
</div>
|
|||
|
|
</form>
|
|||
|
|
</nav>
|
|||
|
|
|
|||
|
|
<section id='main' class="content">
|
|||
|
|
<h1 class='fqn'><span class='in-band'>Macro <a href='index.html'>synom</a>::<wbr><a class="macro" href=''>opt_vec</a></span><span class='out-of-band'><span id='render-detail'>
|
|||
|
|
<a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">
|
|||
|
|
[<span class='inner'>−</span>]
|
|||
|
|
</a>
|
|||
|
|
</span><a class='srclink' href='../src/synom/helper.rs.html#173-180' title='goto source code'>[src]</a></span></h1>
|
|||
|
|
<pre class="rust macro">
|
|||
|
|
<span class="macro">macro_rules</span><span class="macro">!</span> <span class="ident">opt_vec</span> {
|
|||
|
|
(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">i</span>:<span class="ident">expr</span>, <span class="macro-nonterminal">$</span><span class="macro-nonterminal">submac</span>:<span class="macro">ident</span><span class="macro">!</span>( $(<span class="macro-nonterminal">$</span><span class="macro-nonterminal">args</span>:<span class="ident">tt</span>)<span class="op">*</span> )) <span class="op">=></span> { ... };
|
|||
|
|
}</pre>
|
|||
|
|
<div class='docblock'><p>Turn a failed parse into an empty vector. The argument parser must itself
|
|||
|
|
return a vector.</p>
|
|||
|
|
|
|||
|
|
<p>This is often more convenient than <code>option!(...)</code> when the argument produces
|
|||
|
|
a vector.</p>
|
|||
|
|
|
|||
|
|
<ul>
|
|||
|
|
<li><strong>Syntax:</strong> <code>opt_vec!(THING)</code></li>
|
|||
|
|
<li><strong>Output:</strong> <code>THING</code>, which must be <code>Vec<T></code></li>
|
|||
|
|
</ul>
|
|||
|
|
|
|||
|
|
<pre class="rust rust-example-rendered">
|
|||
|
|
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">syn</span>;
|
|||
|
|
<span class="attribute">#[<span class="ident">macro_use</span>]</span> <span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">synom</span>;
|
|||
|
|
|
|||
|
|
<span class="kw">use</span> <span class="ident">syn</span>::{<span class="ident">Lifetime</span>, <span class="ident">Ty</span>};
|
|||
|
|
<span class="kw">use</span> <span class="ident">syn</span>::<span class="ident">parse</span>::{<span class="ident">lifetime</span>, <span class="ident">ty</span>};
|
|||
|
|
|
|||
|
|
<span class="macro">named</span><span class="macro">!</span>(<span class="ident">bound_lifetimes</span> <span class="op">-></span> (<span class="ident">Vec</span><span class="op"><</span><span class="ident">Lifetime</span><span class="op">></span>, <span class="ident">Ty</span>), <span class="macro">tuple</span><span class="macro">!</span>(
|
|||
|
|
<span class="macro">opt_vec</span><span class="macro">!</span>(<span class="macro">do_parse</span><span class="macro">!</span>(
|
|||
|
|
<span class="macro">keyword</span><span class="macro">!</span>(<span class="string">"for"</span>) <span class="op">>></span>
|
|||
|
|
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">"<"</span>) <span class="op">>></span>
|
|||
|
|
<span class="ident">lifetimes</span>: <span class="macro">terminated_list</span><span class="macro">!</span>(<span class="macro">punct</span><span class="macro">!</span>(<span class="string">","</span>), <span class="ident">lifetime</span>) <span class="op">>></span>
|
|||
|
|
<span class="macro">punct</span><span class="macro">!</span>(<span class="string">">"</span>) <span class="op">>></span>
|
|||
|
|
(<span class="ident">lifetimes</span>)
|
|||
|
|
)),
|
|||
|
|
<span class="ident">ty</span>
|
|||
|
|
));
|
|||
|
|
|
|||
|
|
<span class="kw">fn</span> <span class="ident">main</span>() {
|
|||
|
|
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="string">"for<'a, 'b> fn(&'a A) -> &'b B"</span>;
|
|||
|
|
<span class="kw">let</span> <span class="ident">parsed</span> <span class="op">=</span> <span class="ident">bound_lifetimes</span>(<span class="ident">input</span>).<span class="ident">expect</span>(<span class="string">"bound lifetimes"</span>);
|
|||
|
|
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="number">0</span>, [<span class="ident">Lifetime</span>::<span class="ident">new</span>(<span class="string">"'a"</span>), <span class="ident">Lifetime</span>::<span class="ident">new</span>(<span class="string">"'b"</span>)]);
|
|||
|
|
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">parsed</span>);
|
|||
|
|
|
|||
|
|
<span class="kw">let</span> <span class="ident">input</span> <span class="op">=</span> <span class="string">"From<String>"</span>;
|
|||
|
|
<span class="kw">let</span> <span class="ident">parsed</span> <span class="op">=</span> <span class="ident">bound_lifetimes</span>(<span class="ident">input</span>).<span class="ident">expect</span>(<span class="string">"bound lifetimes"</span>);
|
|||
|
|
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">parsed</span>.<span class="number">0</span>.<span class="ident">is_empty</span>());
|
|||
|
|
<span class="macro">println</span><span class="macro">!</span>(<span class="string">"{:?}"</span>, <span class="ident">parsed</span>);
|
|||
|
|
}</pre>
|
|||
|
|
</div></section>
|
|||
|
|
<section id='search' class="content hidden"></section>
|
|||
|
|
|
|||
|
|
<section class="footer"></section>
|
|||
|
|
|
|||
|
|
<aside id="help" class="hidden">
|
|||
|
|
<div>
|
|||
|
|
<h1 class="hidden">Help</h1>
|
|||
|
|
|
|||
|
|
<div class="shortcuts">
|
|||
|
|
<h2>Keyboard Shortcuts</h2>
|
|||
|
|
|
|||
|
|
<dl>
|
|||
|
|
<dt>?</dt>
|
|||
|
|
<dd>Show this help dialog</dd>
|
|||
|
|
<dt>S</dt>
|
|||
|
|
<dd>Focus the search field</dd>
|
|||
|
|
<dt>⇤</dt>
|
|||
|
|
<dd>Move up in search results</dd>
|
|||
|
|
<dt>⇥</dt>
|
|||
|
|
<dd>Move down in search results</dd>
|
|||
|
|
<dt>⏎</dt>
|
|||
|
|
<dd>Go to active search result</dd>
|
|||
|
|
<dt>+</dt>
|
|||
|
|
<dd>Collapse/expand all sections</dd>
|
|||
|
|
</dl>
|
|||
|
|
</div>
|
|||
|
|
|
|||
|
|
<div class="infos">
|
|||
|
|
<h2>Search Tricks</h2>
|
|||
|
|
|
|||
|
|
<p>
|
|||
|
|
Prefix searches with a type followed by a colon (e.g.
|
|||
|
|
<code>fn:</code>) to restrict the search to a given type.
|
|||
|
|
</p>
|
|||
|
|
|
|||
|
|
<p>
|
|||
|
|
Accepted types are: <code>fn</code>, <code>mod</code>,
|
|||
|
|
<code>struct</code>, <code>enum</code>,
|
|||
|
|
<code>trait</code>, <code>type</code>, <code>macro</code>,
|
|||
|
|
and <code>const</code>.
|
|||
|
|
</p>
|
|||
|
|
|
|||
|
|
<p>
|
|||
|
|
Search functions by type signature (e.g.
|
|||
|
|
<code>vec -> usize</code> or <code>* -> vec</code>)
|
|||
|
|
</p>
|
|||
|
|
</div>
|
|||
|
|
</div>
|
|||
|
|
</aside>
|
|||
|
|
|
|||
|
|
|
|||
|
|
|
|||
|
|
<script>
|
|||
|
|
window.rootPath = "../";
|
|||
|
|
window.currentCrate = "synom";
|
|||
|
|
</script>
|
|||
|
|
<script src="../main.js"></script>
|
|||
|
|
<script defer src="../search-index.js"></script>
|
|||
|
|
</body>
|
|||
|
|
</html>
|