28 lines
6.9 KiB
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28 lines
6.9 KiB
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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."><meta name="keywords" content="rust, rustlang, rust-lang, parse_file"><title>parse_file in syn - Rust</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../ayu.css" disabled><link rel="stylesheet" type="text/css" href="../dark.css" disabled><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../storage.js"></script><script defer src="sidebar-items.js"></script><script defer src="../main.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../favicon.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">☰</button><a class="sidebar-logo" href="../syn/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><h2 class="location"></h2></nav><nav class="sidebar"><a class="sidebar-logo" href="../syn/index.html"><div class="logo-container"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></div></a><div class="sidebar-elems"><h2 class="location"><a href="index.html">In syn</a></h2></div></nav><main><div class="width-limiter"><div class="sub-container"><a class="sub-logo-container" href="../syn/index.html"><img class="rust-logo" src="../rust-logo.svg" alt="logo"></a><nav class="sub"><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><button type="button">?</button></div><div id="settings-menu" tabindex="-1"><a href="../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../wheel.svg"></a></div></div></form></nav></div><section id="main-content" class="content"><div class="main-heading"><h1 class="fqn"><span class="in-band">Function <a href="index.html">syn</a>::<wbr><a class="fn" href="#">parse_file</a><button id="copy-path" onclick="copy_path(this)" title="Copy item path to clipboard"><img src="../clipboard.svg" width="19" height="18" alt="Copy item path"></button></span></h1><span class="out-of-band"><a class="srclink" href="../src/syn/lib.rs.html#960-984">source</a> · <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class="inner">−</span>]</a></span></div><div class="docblock item-decl"><pre class="rust fn"><code>pub fn parse_file(content: &<a class="primitive" href="https://doc.rust-lang.org/1.64.0/std/primitive.str.html">str</a>) -> <a class="type" href="parse/type.Result.html" title="type syn::parse::Result">Result</a><<a class="struct" href="struct.File.html" title="struct syn::File">File</a>></code></pre></div><details class="rustdoc-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>
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<p>This is different from <code>syn::parse_str::<File>(content)</code> in two ways:</p>
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<ul>
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<li>It discards a leading byte order mark <code>\u{FEFF}</code> if the file has one.</li>
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<li>It preserves the shebang line of the file, such as <code>#!/usr/bin/env rustx</code>.</li>
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</ul>
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<p>If present, either of these would be an error using <code>from_str</code>.</p>
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<p><em>This function is available only if Syn is built with the <code>"parsing"</code> and
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<code>"full"</code> features.</em></p>
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<h2 id="examples"><a href="#examples">Examples</a></h2>
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<div class="example-wrap"><pre class="rust rust-example-rendered"><code><span class="kw">use</span> <span class="ident">std::error::Error</span>;
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<span class="kw">use</span> <span class="ident">std::fs::File</span>;
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<span class="kw">use</span> <span class="ident">std::io::Read</span>;
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<span class="kw">fn</span> <span class="ident">run</span>() -> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">Box</span><span class="op"><</span><span class="ident">Error</span><span class="op">></span><span class="op">></span> {
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">file</span> <span class="op">=</span> <span class="ident">File::open</span>(<span class="string">"path/to/code.rs"</span>)<span class="question-mark">?</span>;
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<span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">content</span> <span class="op">=</span> <span class="ident">String::new</span>();
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<span class="ident">file</span>.<span class="ident">read_to_string</span>(<span class="kw-2">&mut</span> <span class="ident">content</span>)<span class="question-mark">?</span>;
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<span class="kw">let</span> <span class="ident">ast</span> <span class="op">=</span> <span class="ident">syn::parse_file</span>(<span class="kw-2">&</span><span class="ident">content</span>)<span class="question-mark">?</span>;
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<span class="kw">if</span> <span class="kw">let</span> <span class="prelude-val">Some</span>(<span class="ident">shebang</span>) <span class="op">=</span> <span class="ident">ast</span>.<span class="ident">shebang</span> {
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<span class="macro">println!</span>(<span class="string">"{}"</span>, <span class="ident">shebang</span>);
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}
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<span class="macro">println!</span>(<span class="string">"{} items"</span>, <span class="ident">ast</span>.<span class="ident">items</span>.<span class="ident">len</span>());
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<span class="prelude-val">Ok</span>(())
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}</code></pre></div>
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