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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="API documentation for the Rust `is_str_bidi` fn in crate `encoding_rs`."><meta name="keywords" content="rust, rustlang, rust-lang, is_str_bidi"><title>encoding_rs::mem::is_str_bidi - 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="../../light.css" id="themeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css" disabled ><link rel="stylesheet" type="text/css" href="../../ayu.css" disabled ><script id="default-settings"></script><script src="../../storage.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" type="image/svg+xml" href="../../favicon.svg">
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<link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><style type="text/css">#crate-search{background-image:url("../../down-arrow.svg");}</style></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='../../encoding_rs/index.html'><div class='logo-container rust-logo'><img src='../../rust-logo.png' alt='logo'></div></a><div class="sidebar-elems"><p class="location"><a href="../index.html">encoding_rs</a>::<wbr><a href="index.html">mem</a></p><script>window.sidebarCurrent = {name: "is_str_bidi", ty: "fn", relpath: ""};</script><script defer src="sidebar-items.js"></script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!" aria-haspopup="menu"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices" role="menu"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" disabled autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><button type="button" class="help-button">?</button>
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<a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class="fqn"><span class="out-of-band"><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/encoding_rs/mem.rs.html#1127-1267" title="goto source code">[src]</a></span><span class="in-band">Function <a href="../index.html">encoding_rs</a>::<wbr><a href="index.html">mem</a>::<wbr><a class="fn" href="">is_str_bidi</a></span></h1><pre class="rust fn">pub fn is_str_bidi(buffer: &str) -> bool</pre><div class="docblock"><p>Checks whether a valid UTF-8 buffer contains code points that trigger
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right-to-left processing.</p>
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<p>The check is done on a Unicode block basis without regard to assigned
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vs. unassigned code points in the block. Hebrew presentation forms in
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the Alphabetic Presentation Forms block are treated as if they formed
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a block on their own (i.e. it treated as right-to-left). Additionally,
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the four RIGHT-TO-LEFT FOO controls in General Punctuation are checked
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for. Control characters that are technically bidi controls but do not
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cause right-to-left behavior without the presence of right-to-left
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characters or right-to-left controls are not checked for. As a special
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case, U+FEFF is excluded from Arabic Presentation Forms-B.</p>
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