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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="Parse the content of a file of Rust code."><title>parse_file in syn - 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 fn"><!--[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><div class="sidebar-elems"></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>Function <a href="index.html">syn</a>::<wbr><a class="fn" href="#">parse_file</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/lib.rs.html#997-1021">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><pre class="rust item-decl"><code>pub fn parse_file(content: &amp;<a class="primitive" href="https://doc.rust-lang.org/1.80.0/std/primitive.str.html">str</a>) -&gt; <a class="type" href="parse/type.Result.html" title="type syn::parse::Result">Result</a>&lt;<a class="struct" href="struct.File.html" title="struct syn::File">File</a>&gt;</code></pre><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Parse the content of a file of Rust code.</p>
deploy: 4a83cfd6f9c58b14a87234162281aad1aef83c3e
2024-02-13 06:38:44 +00:00
<p>This is different from <code>syn::parse_str::&lt;File&gt;(content)</code> in two ways:</p>
<ul>
<li>It discards a leading byte order mark <code>\u{FEFF}</code> if the file has one.</li>
<li>It preserves the shebang line of the file, such as <code>#!/usr/bin/env rustx</code>.</li>
</ul>
<p>If present, either of these would be an error using <code>from_str</code>.</p>
deploy: 39fc7f2b9fd58ce67982b1c71c788f3b031ae3df
2024-03-27 11:12:16 +00:00
<h2 id="examples"><a class="doc-anchor" href="#examples">§</a>Examples</h2>
deploy: 4a83cfd6f9c58b14a87234162281aad1aef83c3e
2024-02-13 06:38:44 +00:00
<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use </span>std::error::Error;
<span class="kw">use </span>std::fs::File;
<span class="kw">use </span>std::io::Read;
<span class="kw">fn </span>run() -&gt; <span class="prelude-ty">Result</span>&lt;(), Box&lt;<span class="kw">dyn </span>Error&gt;&gt; {
<span class="kw">let </span><span class="kw-2">mut </span>file = File::open(<span class="string">"path/to/code.rs"</span>)<span class="question-mark">?</span>;
<span class="kw">let </span><span class="kw-2">mut </span>content = String::new();
file.read_to_string(<span class="kw-2">&amp;mut </span>content)<span class="question-mark">?</span>;
<span class="kw">let </span>ast = syn::parse_file(<span class="kw-2">&amp;</span>content)<span class="question-mark">?</span>;
<span class="kw">if let </span><span class="prelude-val">Some</span>(shebang) = ast.shebang {
<span class="macro">println!</span>(<span class="string">"{}"</span>, shebang);
}
<span class="macro">println!</span>(<span class="string">"{} items"</span>, ast.items.len());
<span class="prelude-val">Ok</span>(())
}</code></pre></div>
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