<!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="API documentation for the Rust `escape_default` fn in crate `std`."> <meta name="keywords" content="rust, rustlang, rust-lang, escape_default"> <title>std::ascii::escape_default - Rust</title> <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="../../dark.css"> <link rel="stylesheet" type="text/css" href="../../main.css" id="themeStyle"> <script src="../../storage.js"></script> <link rel="shortcut icon" href="https://doc.rust-lang.org/favicon.ico"> </head> <body class="rustdoc fn"> <!--[if lte IE 8]> <div class="warning"> This old browser is unsupported and will most likely display funky things. </div> <![endif]--> <nav class="sidebar"> <div class="sidebar-menu">☰</div> <a href='../../std/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a> <p class='location'><a href='../index.html'>std</a>::<wbr><a href='index.html'>ascii</a></p><script>window.sidebarCurrent = {name: 'escape_default', ty: 'fn', relpath: ''};</script><script defer src="sidebar-items.js"></script> </nav> <div class="theme-picker"> <button id="theme-picker" aria-label="Pick another theme!"> <img src="../../brush.svg" width="18" alt="Pick another theme!"> </button> <div id="theme-choices"></div> </div> <script src="../../theme.js"></script> <nav class="sub"> <form class="search-form js-only"> <div class="search-container"> <input class="search-input" name="search" autocomplete="off" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"> </div> </form> </nav> <section id='main' class="content"> <h1 class='fqn'><span class='in-band'>Function <a href='../index.html'>std</a>::<wbr><a href='index.html'>ascii</a>::<wbr><a class="fn" href=''>escape_default</a></span><span class='out-of-band'><span class='since' title='Stable since Rust version 1.0.0'>1.0.0</span><span id='render-detail'> <a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs"> [<span class='inner'>−</span>] </a> </span><a class='srclink' href='../../src/std/ascii.rs.html#557-577' title='goto source code'>[src]</a></span></h1> <div class="important-traits"><div class='tooltip'>ⓘ<span class='tooltiptext'>Important traits for <a class="struct" href="../../std/ascii/struct.EscapeDefault.html" title="struct std::ascii::EscapeDefault">EscapeDefault</a></span></div><div class="content hidden"><h3 class="important">Important traits for <a class="struct" href="../../std/ascii/struct.EscapeDefault.html" title="struct std::ascii::EscapeDefault">EscapeDefault</a></h3><code class="content"><span class="where fmt-newline">impl <a class="trait" href="../../std/iter/trait.Iterator.html" title="trait std::iter::Iterator">Iterator</a> for <a class="struct" href="../../std/ascii/struct.EscapeDefault.html" title="struct std::ascii::EscapeDefault">EscapeDefault</a></span><span class="where fmt-newline"> type <a href='../../std/iter/trait.Iterator.html#associatedtype.Item' class="type">Item</a> = <a class="primitive" href="../primitive.u8.html">u8</a>;</span></code></div></div><pre class='rust fn'>pub fn escape_default(c: <a class="primitive" href="../primitive.u8.html">u8</a>) -> <a class="struct" href="../../std/ascii/struct.EscapeDefault.html" title="struct std::ascii::EscapeDefault">EscapeDefault</a></pre><div class='docblock'><p>Returns an iterator that produces an escaped version of a <code>u8</code>.</p> <p>The default is chosen with a bias toward producing literals that are legal in a variety of languages, including C++11 and similar C-family languages. The exact rules are:</p> <ul> <li>Tab, CR and LF are escaped as '\t', '\r' and '\n' respectively.</li> <li>Single-quote, double-quote and backslash chars are backslash-escaped.</li> <li>Any other chars in the range [0x20,0x7e] are not escaped.</li> <li>Any other chars are given hex escapes of the form '\xNN'.</li> <li>Unicode escapes are never generated by this function.</li> </ul> <h1 id="examples" class="section-header"><a href="#examples">Examples</a></h1> <pre class="rust rust-example-rendered"> <span class="kw">use</span> <span class="ident">std</span>::<span class="ident">ascii</span>; <span class="kw">let</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="ident">ascii</span>::<span class="ident">escape_default</span>(<span class="string">b'0'</span>).<span class="ident">next</span>().<span class="ident">unwrap</span>(); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'0'</span>, <span class="ident">escaped</span>); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="ident">ascii</span>::<span class="ident">escape_default</span>(<span class="string">b'\t'</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'\\'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b't'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="ident">ascii</span>::<span class="ident">escape_default</span>(<span class="string">b'\r'</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'\\'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'r'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="ident">ascii</span>::<span class="ident">escape_default</span>(<span class="string">b'\n'</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'\\'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'n'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="ident">ascii</span>::<span class="ident">escape_default</span>(<span class="string">b'\''</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'\\'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'\''</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="ident">ascii</span>::<span class="ident">escape_default</span>(<span class="string">b'"'</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'\\'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'"'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="ident">ascii</span>::<span class="ident">escape_default</span>(<span class="string">b'\\'</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'\\'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'\\'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="kw">let</span> <span class="kw-2">mut</span> <span class="ident">escaped</span> <span class="op">=</span> <span class="ident">ascii</span>::<span class="ident">escape_default</span>(<span class="string">b'\x9d'</span>); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'\\'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'x'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'9'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>()); <span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">b'd'</span>, <span class="ident">escaped</span>.<span class="ident">next</span>().<span class="ident">unwrap</span>());<a class="test-arrow" target="_blank" href="https://play.rust-lang.org/?code=%23!%5Ballow(unused)%5D%0Afn%20main()%20%7B%0Ause%20std%3A%3Aascii%3B%0A%0Alet%20escaped%20%3D%20ascii%3A%3Aescape_default(b'0').next().unwrap()%3B%0Aassert_eq!(b'0'%2C%20escaped)%3B%0A%0Alet%20mut%20escaped%20%3D%20ascii%3A%3Aescape_default(b'%5Ct')%3B%0A%0Aassert_eq!(b'%5C%5C'%2C%20escaped.next().unwrap())%3B%0Aassert_eq!(b't'%2C%20escaped.next().unwrap())%3B%0A%0Alet%20mut%20escaped%20%3D%20ascii%3A%3Aescape_default(b'%5Cr')%3B%0A%0Aassert_eq!(b'%5C%5C'%2C%20escaped.next().unwrap())%3B%0Aassert_eq!(b'r'%2C%20escaped.next().unwrap())%3B%0A%0Alet%20mut%20escaped%20%3D%20ascii%3A%3Aescape_default(b'%5Cn')%3B%0A%0Aassert_eq!(b'%5C%5C'%2C%20escaped.next().unwrap())%3B%0Aassert_eq!(b'n'%2C%20escaped.next().unwrap())%3B%0A%0Alet%20mut%20escaped%20%3D%20ascii%3A%3Aescape_default(b'%5C'')%3B%0A%0Aassert_eq!(b'%5C%5C'%2C%20escaped.next().unwrap())%3B%0Aassert_eq!(b'%5C''%2C%20escaped.next().unwrap())%3B%0A%0Alet%20mut%20escaped%20%3D%20ascii%3A%3Aescape_default(b'%22')%3B%0A%0Aassert_eq!(b'%5C%5C'%2C%20escaped.next().unwrap())%3B%0Aassert_eq!(b'%22'%2C%20escaped.next().unwrap())%3B%0A%0Alet%20mut%20escaped%20%3D%20ascii%3A%3Aescape_default(b'%5C%5C')%3B%0A%0Aassert_eq!(b'%5C%5C'%2C%20escaped.next().unwrap())%3B%0Aassert_eq!(b'%5C%5C'%2C%20escaped.next().unwrap())%3B%0A%0Alet%20mut%20escaped%20%3D%20ascii%3A%3Aescape_default(b'%5Cx9d')%3B%0A%0Aassert_eq!(b'%5C%5C'%2C%20escaped.next().unwrap())%3B%0Aassert_eq!(b'x'%2C%20escaped.next().unwrap())%3B%0Aassert_eq!(b'9'%2C%20escaped.next().unwrap())%3B%0Aassert_eq!(b'd'%2C%20escaped.next().unwrap())%3B%0A%7D">Run</a></pre> </div></section> <section id='search' class="content hidden"></section> <section class="footer"></section> <aside id="help" class="hidden"> <div> <h1 class="hidden">Help</h1> <div class="shortcuts"> <h2>Keyboard Shortcuts</h2> <dl> <dt><kbd>?</kbd></dt> <dd>Show this help dialog</dd> <dt><kbd>S</kbd></dt> <dd>Focus the search field</dd> <dt><kbd>↑</kbd></dt> <dd>Move up in search results</dd> <dt><kbd>↓</kbd></dt> <dd>Move down in search results</dd> <dt><kbd>↹</kbd></dt> <dd>Switch tab</dd> <dt><kbd>⏎</kbd></dt> <dd>Go to active search result</dd> <dt><kbd>+</kbd></dt> <dd>Expand all sections</dd> <dt><kbd>-</kbd></dt> <dd>Collapse all sections</dd> </dl> </div> <div class="infos"> <h2>Search Tricks</h2> <p> Prefix searches with a type followed by a colon (e.g. <code>fn:</code>) to restrict the search to a given type. </p> <p> Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>. </p> <p> Search functions by type signature (e.g. <code>vec -> usize</code> or <code>* -> vec</code>) </p> </div> </div> </aside> <script> window.rootPath = "../../"; window.currentCrate = "std"; </script> <script src="../../main.js"></script> <script defer src="../../search-index.js"></script> </body> </html>