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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="Document tree traversal to walk a shared borrow of a document tree."><title>toml_edit::visit - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="toml_edit" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-df360f571f6edeae.css"></noscript><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"><!--[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="../../toml_edit/index.html">toml_edit</a><span class="version">0.22.17</span></h2></div><h2 class="location"><a href="#">Module visit</a></h2><div class="sidebar-elems"><section><ul class="block"><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></section><h2><a href="../index.html">In crate toml_edit</a></h2></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Module <a href="../index.html">toml_edit</a>::<wbr><a class="mod" href="#">visit</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../../src/toml_edit/visit.rs.html#1-239">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>Document tree traversal to walk a shared borrow of a document tree.</p>
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<p>Each method of the <a href="trait.Visit.html" title="trait toml_edit::visit::Visit"><code>Visit</code></a> trait is a hook that can be overridden
to customize the behavior when mutating the corresponding type of node.
By default, every method recursively visits the substructure of the
input by invoking the right visitor method of each of its fields.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code>
<span class="kw">pub trait </span>Visit&lt;<span class="lifetime">'doc</span>&gt; {
<span class="comment">/* ... */
</span><span class="kw">fn </span>visit_item(<span class="kw-2">&amp;mut </span><span class="self">self</span>, i: <span class="kw-2">&amp;</span><span class="lifetime">'doc </span>Item) {
visit_item(<span class="self">self</span>, i);
}
<span class="comment">/* ... */
</span>}
<span class="kw">pub fn </span>visit_item&lt;<span class="lifetime">'doc</span>, V&gt;(v: <span class="kw-2">&amp;mut </span>V, node: <span class="kw-2">&amp;</span><span class="lifetime">'doc </span>Item)
<span class="kw">where
</span>V: Visit&lt;<span class="lifetime">'doc</span>&gt; + <span class="question-mark">?</span>Sized,
{
<span class="kw">match </span>node {
Item::None =&gt; {}
Item::Value(value) =&gt; v.visit_value(value),
Item::Table(table) =&gt; v.visit_table(table),
Item::ArrayOfTables(array) =&gt; v.visit_array_of_tables(array),
}
}</code></pre></div>
<p>The API is modeled after <a href="https://docs.rs/syn/1/syn/visit"><code>syn::visit</code></a>.</p>
deploy: 39fc7f2b9fd58ce67982b1c71c788f3b031ae3df
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<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
deploy: 22498719e1dbb1ddc4a5584a4fcba2f337ccb991
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<p>This visitor stores every string in the document.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>toml_edit::visit::<span class="kw-2">*</span>;
<span class="attr">#[derive(Default)]
</span><span class="kw">struct </span>StringCollector&lt;<span class="lifetime">'doc</span>&gt; {
strings: Vec&lt;<span class="kw-2">&amp;</span><span class="lifetime">'doc </span>str&gt;,
}
<span class="kw">impl</span>&lt;<span class="lifetime">'doc</span>&gt; Visit&lt;<span class="lifetime">'doc</span>&gt; <span class="kw">for </span>StringCollector&lt;<span class="lifetime">'doc</span>&gt; {
<span class="kw">fn </span>visit_string(<span class="kw-2">&amp;mut </span><span class="self">self</span>, node: <span class="kw-2">&amp;</span><span class="lifetime">'doc </span>Formatted&lt;String&gt;) {
<span class="self">self</span>.strings.push(node.value().as_str());
}
}
<span class="kw">let </span>input = <span class="string">r#"
laputa = "sky-castle"
the-force = { value = "surrounds-you" }
"#</span>;
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<span class="kw">let </span><span class="kw-2">mut </span>document: DocumentMut = input.parse().unwrap();
deploy: 22498719e1dbb1ddc4a5584a4fcba2f337ccb991
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<span class="kw">let </span><span class="kw-2">mut </span>visitor = StringCollector::default();
visitor.visit_document(<span class="kw-2">&amp;</span>document);
<span class="macro">assert_eq!</span>(visitor.strings, <span class="macro">vec!</span>[<span class="string">"sky-castle"</span>, <span class="string">"surrounds-you"</span>]);</code></pre></div>
<p>For a more complex example where the visitor has internal state, see <code>examples/visit.rs</code>
<a href="https://github.com/toml-rs/toml/blob/main/crates/toml_edit/examples/visit.rs">on GitHub</a>.</p>
deploy: 39fc7f2b9fd58ce67982b1c71c788f3b031ae3df
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</div></details><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.Visit.html" title="trait toml_edit::visit::Visit">Visit</a></div><div class="desc docblock-short">Document tree traversal to mutate an exclusive borrow of a document tree in-place.</div></li></ul><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.visit_array.html" title="fn toml_edit::visit::visit_array">visit_array</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_array_of_tables.html" title="fn toml_edit::visit::visit_array_of_tables">visit_array_of_tables</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_document.html" title="fn toml_edit::visit::visit_document">visit_document</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_inline_table.html" title="fn toml_edit::visit::visit_inline_table">visit_inline_table</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_item.html" title="fn toml_edit::visit::visit_item">visit_item</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_table.html" title="fn toml_edit::visit::visit_table">visit_table</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_table_like.html" title="fn toml_edit::visit::visit_table_like">visit_table_like</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_table_like_kv.html" title="fn toml_edit::visit::visit_table_like_kv">visit_table_like_kv</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_value.html" title="fn toml_edit::visit::visit_value">visit_value</a></div></li></ul></section></div></main></body></html>
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