edg-l/edlang
1
1
Fork 0
mirror of https://github.com/edg-l/edlang.git synced 2024-10-18 15:08:17 +00:00
Code Issues Packages Projects Releases Wiki Activity
edlang/syn/fold/index.html

66 lines
32 KiB
HTML
Raw Normal View History

deploy: b3bd34a9bbae9c73eb2d66a212d6921bd7499b69
2024-07-26 09:42:18 +00:00
<!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="Syntax tree traversal to transform the nodes of an owned syntax tree."><title>syn::fold - 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="syn" 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="../../syn/index.html">syn</a><span class="version">2.0.72</span></h2></div><h2 class="location"><a href="#">Module fold</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 syn</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">syn</a>::<wbr><a class="mod" href="#">fold</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/syn/gen/fold.rs.html#4-3779">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>Syntax tree traversal to transform the nodes of an owned syntax tree.</p>
deploy: 4a83cfd6f9c58b14a87234162281aad1aef83c3e
2024-02-13 06:38:44 +00:00
<p>Each method of the <a href="trait.Fold.html" title="trait syn::fold::Fold"><code>Fold</code></a> trait is a hook that can be overridden to
customize the behavior when transforming 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>Fold {
<span class="comment">/* ... */
</span><span class="kw">fn </span>fold_expr_binary(<span class="kw-2">&amp;mut </span><span class="self">self</span>, node: ExprBinary) -&gt; ExprBinary {
fold_expr_binary(<span class="self">self</span>, node)
}
<span class="comment">/* ... */
</span>}
<span class="kw">pub fn </span>fold_expr_binary&lt;V&gt;(v: <span class="kw-2">&amp;mut </span>V, node: ExprBinary) -&gt; ExprBinary
<span class="kw">where
</span>V: Fold + <span class="question-mark">?</span>Sized,
{
ExprBinary {
attrs: node
.attrs
.into_iter()
.map(|attr| v.fold_attribute(attr))
.collect(),
left: Box::new(v.fold_expr(<span class="kw-2">*</span>node.left)),
op: v.fold_bin_op(node.op),
right: Box::new(v.fold_expr(<span class="kw-2">*</span>node.right)),
}
}
<span class="comment">/* ... */</span></code></pre></div>
<br>
deploy: 39fc7f2b9fd58ce67982b1c71c788f3b031ae3df
2024-03-27 11:12:16 +00:00
<h2 id="example"><a class="doc-anchor" href="#example">§</a>Example</h2>
deploy: 4a83cfd6f9c58b14a87234162281aad1aef83c3e
2024-02-13 06:38:44 +00:00
<p>This fold inserts parentheses to fully parenthesizes any expression.</p>
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="comment">// [dependencies]
// quote = "1.0"
// syn = { version = "2.0", features = ["fold", "full"] }
</span><span class="kw">use </span>quote::quote;
<span class="kw">use </span>syn::fold::{fold_expr, Fold};
<span class="kw">use </span>syn::{token, Expr, ExprParen};
<span class="kw">struct </span>ParenthesizeEveryExpr;
<span class="kw">impl </span>Fold <span class="kw">for </span>ParenthesizeEveryExpr {
<span class="kw">fn </span>fold_expr(<span class="kw-2">&amp;mut </span><span class="self">self</span>, expr: Expr) -&gt; Expr {
Expr::Paren(ExprParen {
attrs: Vec::new(),
expr: Box::new(fold_expr(<span class="self">self</span>, expr)),
paren_token: token::Paren::default(),
})
}
}
<span class="kw">fn </span>main() {
deploy: 03a244db41b752280f505ceeaea877cc9b95537b
2024-05-05 09:43:20 +00:00
<span class="kw">let </span>code = <span class="macro">quote!</span> { a() + b(<span class="number">1</span>) * c.d };
deploy: 4a83cfd6f9c58b14a87234162281aad1aef83c3e
2024-02-13 06:38:44 +00:00
<span class="kw">let </span>expr: Expr = syn::parse2(code).unwrap();
<span class="kw">let </span>parenthesized = ParenthesizeEveryExpr.fold_expr(expr);
<span class="macro">println!</span>(<span class="string">"{}"</span>, <span class="macro">quote!</span>(#parenthesized));
<span class="comment">// Output: (((a)()) + (((b)((1))) * ((c).d)))
</span>}</code></pre></div>
deploy: 03a244db41b752280f505ceeaea877cc9b95537b
2024-05-05 09:43:20 +00:00
</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.Fold.html" title="trait syn::fold::Fold">Fold</a></div><div class="desc docblock-short">Syntax tree traversal to transform the nodes of an owned syntax tree.</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.fold_abi.html" title="fn syn::fold::fold_abi">fold_abi</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_angle_bracketed_generic_arguments.html" title="fn syn::fold::fold_angle_bracketed_generic_arguments">fold_angle_bracketed_generic_arguments</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_arm.html" title="fn syn::fold::fold_arm">fold_arm</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_assoc_const.html" title="fn syn::fold::fold_assoc_const">fold_assoc_const</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_assoc_type.html" title="fn syn::fold::fold_assoc_type">fold_assoc_type</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_attr_style.html" title="fn syn::fold::fold_attr_style">fold_attr_style</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_attribute.html" title="fn syn::fold::fold_attribute">fold_attribute</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_bare_fn_arg.html" title="fn syn::fold::fold_bare_fn_arg">fold_bare_fn_arg</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_bare_variadic.html" title="fn syn::fold::fold_bare_variadic">fold_bare_variadic</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_bin_op.html" title="fn syn::fold::fold_bin_op">fold_bin_op</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_block.html" title="fn syn::fold::fold_block">fold_block</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_bound_lifetimes.html" title="fn syn::fold::fold_bound_lifetimes">fold_bound_lifetimes</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_const_param.html" title="fn syn::fold::fold_const_param">fold_const_param</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_constraint.html" title="fn syn::fold::fold_constraint">fold_constraint</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_data.html" title="fn syn::fold::fold_data">fold_data</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_data_enum.html" title="fn syn::fold::fold_data_enum">fold_data_enum</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_data_struct.html" title="fn syn::fold::fold_data_struct">fold_data_struct</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_data_union.html" title="fn syn::fold::fold_data_union">fold_data_union</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_derive_input.html" title="fn syn::fold::fold_derive_input">fold_derive_input</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_expr.html" title="fn syn::fold::fold_expr">fold_expr</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_expr_array.html" title="fn syn::fold::fold_expr_array">fold_expr_array</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_expr_assign.html" title="fn syn::fold::fold_expr_assign">fold_expr_assign</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_expr_async.html" title="fn syn::fold::fold_expr_async">fold_expr_async</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_expr_await.html" title="fn syn::fold::fold_expr_await">fold_expr_await</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_expr_binary.html" title="fn syn::fold::fold_expr_binary">fold_expr_binary</a></div></li><li><div class="item-name"><a class="fn" href="fn.fold_expr_block.html" title="fn syn::fold::fold_expr_block">f
Reference in a new issue Copy permalink