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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 mutate an exclusive borrow of a document tree in place."><title>toml_edit::visit_mut - 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-ac92e1bbe349e143.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="1.76.0 (07dca489a 2024-02-04)" data-channel="1.76.0" data-search-js="search-2b6ce74ff89ae146.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-f2adc0d6ca4d09fb.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-305769736d49e732.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-feafe1bb7466e4bd.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"><!--[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">☰</button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../toml_edit/index.html">toml_edit</a><span class="version">0.22.6</span></h2></div><h2 class="location"><a href="#">Module visit_mut</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>
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<main><div class="width-limiter"><nav class="sub"><form class="search-form"><span></span><div id="sidebar-button" tabindex="-1"><a href="../../toml_edit/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>Module <a href="../index.html">toml_edit</a>::<wbr><a class="mod" href="#">visit_mut</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/toml_edit/visit_mut.rs.html#1-256">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>−</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 mutate an exclusive borrow of a document tree in place.</p>
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<p>Each method of the <a href="trait.VisitMut.html" title="trait toml_edit::visit_mut::VisitMut"><code>VisitMut</code></a> trait is a hook that can be overridden
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to customize the behavior when mutating the corresponding type of node.
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By default, every method recursively visits the substructure of the
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input by invoking the right visitor method of each of its fields.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code>
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<span class="kw">pub trait </span>VisitMut {
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<span class="comment">/* ... */
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</span><span class="kw">fn </span>visit_item_mut(<span class="kw-2">&mut </span><span class="self">self</span>, i: <span class="kw-2">&mut </span>Item) {
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visit_item_mut(<span class="self">self</span>, i);
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}
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<span class="comment">/* ... */
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</span>}
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<span class="kw">pub fn </span>visit_item_mut<V>(v: <span class="kw-2">&mut </span>V, node: <span class="kw-2">&mut </span>Item)
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<span class="kw">where
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</span>V: VisitMut + <span class="question-mark">?</span>Sized,
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{
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<span class="kw">match </span>node {
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Item::None => {}
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Item::Value(value) => v.visit_value_mut(value),
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Item::Table(table) => v.visit_table_mut(table),
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Item::ArrayOfTables(array) => v.visit_array_of_tables_mut(array),
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}
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}</code></pre></div>
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<p>The API is modeled after <a href="https://docs.rs/syn/1/syn/visit_mut"><code>syn::visit_mut</code></a>.</p>
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<h2 id="examples"><a href="#examples">Examples</a></h2>
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<p>This visitor replaces every floating point value with its decimal string representation, to
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2 decimal points.</p>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>toml_edit::visit_mut::<span class="kw-2">*</span>;
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<span class="kw">struct </span>FloatToString;
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<span class="kw">impl </span>VisitMut <span class="kw">for </span>FloatToString {
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<span class="kw">fn </span>visit_value_mut(<span class="kw-2">&mut </span><span class="self">self</span>, node: <span class="kw-2">&mut </span>Value) {
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<span class="kw">if let </span>Value::Float(f) = node {
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<span class="comment">// Convert the float to a string.
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</span><span class="kw">let </span><span class="kw-2">mut </span>s = Formatted::new(<span class="macro">format!</span>(<span class="string">"{:.2}"</span>, f.value()));
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<span class="comment">// Copy over the formatting.
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</span>std::mem::swap(s.decor_mut(), f.decor_mut());
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<span class="kw-2">*</span>node = Value::String(s);
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}
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<span class="comment">// Most of the time, you will also need to call the default implementation to recurse
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// further down the document tree.
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</span>visit_value_mut(<span class="self">self</span>, node);
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}
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}
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<span class="kw">let </span>input = <span class="string">r#"
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banana = 3.26
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table = { apple = 4.5 }
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"#</span>;
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<span class="kw">let </span><span class="kw-2">mut </span>document: Document = input.parse().unwrap();
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<span class="kw">let </span><span class="kw-2">mut </span>visitor = FloatToString;
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visitor.visit_document_mut(<span class="kw-2">&mut </span>document);
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<span class="kw">let </span>output = <span class="string">r#"
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banana = "3.26"
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table = { apple = "4.50" }
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"#</span>;
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<span class="macro">assert_eq!</span>(<span class="macro">format!</span>(<span class="string">"{}"</span>, document), output);</code></pre></div>
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<p>For a more complex example where the visitor has internal state, see <code>examples/visit.rs</code>
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<a href="https://github.com/toml-rs/toml/blob/main/crates/toml_edit/examples/visit.rs">on GitHub</a>.</p>
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</div></details><h2 id="traits" class="section-header"><a href="#traits">Traits</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.VisitMut.html" title="trait toml_edit::visit_mut::VisitMut">VisitMut</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"><a href="#functions">Functions</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.visit_array_mut.html" title="fn toml_edit::visit_mut::visit_array_mut">visit_array_mut</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_array_of_tables_mut.html" title="fn toml_edit::visit_mut::visit_array_of_tables_mut">visit_array_of_tables_mut</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_document_mut.html" title="fn toml_edit::visit_mut::visit_document_mut">visit_document_mut</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_inline_table_mut.html" title="fn toml_edit::visit_mut::visit_inline_table_mut">visit_inline_table_mut</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_item_mut.html" title="fn toml_edit::visit_mut::visit_item_mut">visit_item_mut</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_table_like_kv_mut.html" title="fn toml_edit::visit_mut::visit_table_like_kv_mut">visit_table_like_kv_mut</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_table_like_mut.html" title="fn toml_edit::visit_mut::visit_table_like_mut">visit_table_like_mut</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_table_mut.html" title="fn toml_edit::visit_mut::visit_table_mut">visit_table_mut</a></div></li><li><div class="item-name"><a class="fn" href="fn.visit_value_mut.html" title="fn toml_edit::visit_mut::visit_value_mut">visit_value_mut</a></div></li></ul></section></div></main></body></html> |