| <!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="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/unicode-bidi-0.3.13/src/deprecated.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>deprecated.rs - source</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" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.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 source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../unicode_bidi/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../unicode_bidi/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><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"><a href="../../help.html">?</a></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><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// Copyright 2015 The Servo Project Developers. See the |
| // COPYRIGHT file at the top-level directory of this distribution. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| </span><span class="doccomment">//! This module holds deprecated assets only. |
| |
| </span><span class="kw">use </span>alloc::vec::Vec; |
| |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// Find the level runs within a line and return them in visual order. |
| /// |
| /// NOTE: This implementation is incomplete. The algorithm needs information about the text, |
| /// including original `BidiClass` property of each character, to be able to perform correctly. |
| /// Please see [`BidiInfo::visual_runs()`](../struct.BidiInfo.html#method.visual_runs) for the |
| /// improved implementation. |
| /// |
| /// `line` is a range of bytes indices within `levels`. |
| /// |
| /// <http://www.unicode.org/reports/tr9/#Reordering_Resolved_Levels> |
| </span><span class="attribute">#[deprecated( |
| since = <span class="string">"0.3.0"</span>, |
| note = <span class="string">"please use `BidiInfo::visual_runs()` instead." |
| </span>)] |
| </span><span class="kw">pub fn </span>visual_runs(line: Range<usize>, levels: <span class="kw-2">&</span>[Level]) -> Vec<LevelRun> { |
| <span class="macro">assert!</span>(line.start <= levels.len()); |
| <span class="macro">assert!</span>(line.end <= levels.len()); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>runs = Vec::new(); |
| |
| <span class="comment">// Find consecutive level runs. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>start = line.start; |
| <span class="kw">let </span><span class="kw-2">mut </span>run_level = levels[start]; |
| <span class="kw">let </span><span class="kw-2">mut </span>min_level = run_level; |
| <span class="kw">let </span><span class="kw-2">mut </span>max_level = run_level; |
| |
| <span class="kw">for </span>(i, <span class="kw-2">&</span>new_level) <span class="kw">in </span>levels.iter().enumerate().take(line.end).skip(start + <span class="number">1</span>) { |
| <span class="kw">if </span>new_level != run_level { |
| <span class="comment">// End of the previous run, start of a new one. |
| </span>runs.push(start..i); |
| start = i; |
| run_level = new_level; |
| |
| min_level = cmp::min(run_level, min_level); |
| max_level = cmp::max(run_level, max_level); |
| } |
| } |
| runs.push(start..line.end); |
| |
| <span class="kw">let </span>run_count = runs.len(); |
| |
| <span class="comment">// Re-order the odd runs. |
| // <http://www.unicode.org/reports/tr9/#L2> |
| |
| // Stop at the lowest *odd* level. |
| </span>min_level = min_level.new_lowest_ge_rtl().expect(<span class="string">"Level error"</span>); |
| |
| <span class="kw">while </span>max_level >= min_level { |
| <span class="comment">// Look for the start of a sequence of consecutive runs of max_level or higher. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>seq_start = <span class="number">0</span>; |
| <span class="kw">while </span>seq_start < run_count { |
| <span class="kw">if </span>levels[runs[seq_start].start] < max_level { |
| seq_start += <span class="number">1</span>; |
| <span class="kw">continue</span>; |
| } |
| |
| <span class="comment">// Found the start of a sequence. Now find the end. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>seq_end = seq_start + <span class="number">1</span>; |
| <span class="kw">while </span>seq_end < run_count { |
| <span class="kw">if </span>levels[runs[seq_end].start] < max_level { |
| <span class="kw">break</span>; |
| } |
| seq_end += <span class="number">1</span>; |
| } |
| |
| <span class="comment">// Reverse the runs within this sequence. |
| </span>runs[seq_start..seq_end].reverse(); |
| |
| seq_start = seq_end; |
| } |
| max_level |
| .lower(<span class="number">1</span>) |
| .expect(<span class="string">"Lowering embedding level below zero"</span>); |
| } |
| |
| runs |
| } |
| </code></pre></div> |
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