| <!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/git/checkouts/rayon-3b3b152053499ede/a07ce2e/src/split_producer.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>split_producer.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="../../rayon/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="../../rayon/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="doccomment">//! Common splitter for strings and slices |
| //! |
| //! This module is private, so these items are effectively `pub(super)` |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::iter::plumbing::{Folder, UnindexedProducer}; |
| |
| <span class="doccomment">/// Common producer for splitting on a predicate. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">struct </span>SplitProducer<<span class="lifetime">'p</span>, P, V> { |
| data: V, |
| separator: <span class="kw-2">&</span><span class="lifetime">'p </span>P, |
| |
| <span class="doccomment">/// Marks the endpoint beyond which we've already found no separators. |
| </span>tail: usize, |
| } |
| |
| <span class="doccomment">/// Helper trait so `&str`, `&[T]`, and `&mut [T]` can share `SplitProducer`. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">trait </span>Fissile<P>: Sized { |
| <span class="kw">fn </span>length(<span class="kw-2">&</span><span class="self">self</span>) -> usize; |
| <span class="kw">fn </span>midpoint(<span class="kw-2">&</span><span class="self">self</span>, end: usize) -> usize; |
| <span class="kw">fn </span>find(<span class="kw-2">&</span><span class="self">self</span>, separator: <span class="kw-2">&</span>P, start: usize, end: usize) -> <span class="prelude-ty">Option</span><usize>; |
| <span class="kw">fn </span>rfind(<span class="kw-2">&</span><span class="self">self</span>, separator: <span class="kw-2">&</span>P, end: usize) -> <span class="prelude-ty">Option</span><usize>; |
| <span class="kw">fn </span>split_once(<span class="self">self</span>, index: usize) -> (<span class="self">Self</span>, <span class="self">Self</span>); |
| <span class="kw">fn </span>fold_splits<F>(<span class="self">self</span>, separator: <span class="kw-2">&</span>P, folder: F, skip_last: bool) -> F |
| <span class="kw">where |
| </span>F: Folder<<span class="self">Self</span>>, |
| <span class="self">Self</span>: Send; |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'p</span>, P, V> SplitProducer<<span class="lifetime">'p</span>, P, V> |
| <span class="kw">where |
| </span>V: Fissile<P> + Send, |
| { |
| <span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>new(data: V, separator: <span class="kw-2">&</span><span class="lifetime">'p </span>P) -> <span class="self">Self </span>{ |
| SplitProducer { |
| tail: data.length(), |
| data, |
| separator, |
| } |
| } |
| |
| <span class="doccomment">/// Common `fold_with` implementation, integrating `SplitTerminator`'s |
| /// need to sometimes skip its final empty item. |
| </span><span class="kw">pub</span>(<span class="kw">super</span>) <span class="kw">fn </span>fold_with<F>(<span class="self">self</span>, folder: F, skip_last: bool) -> F |
| <span class="kw">where |
| </span>F: Folder<V>, |
| { |
| <span class="kw">let </span>SplitProducer { |
| data, |
| separator, |
| tail, |
| } = <span class="self">self</span>; |
| |
| <span class="kw">if </span>tail == data.length() { |
| <span class="comment">// No tail section, so just let `fold_splits` handle it. |
| </span>data.fold_splits(separator, folder, skip_last) |
| } <span class="kw">else if let </span><span class="prelude-val">Some</span>(index) = data.rfind(separator, tail) { |
| <span class="comment">// We found the last separator to complete the tail, so |
| // end with that slice after `fold_splits` finds the rest. |
| </span><span class="kw">let </span>(left, right) = data.split_once(index); |
| <span class="kw">let </span>folder = left.fold_splits(separator, folder, <span class="bool-val">false</span>); |
| <span class="kw">if </span>skip_last || folder.full() { |
| folder |
| } <span class="kw">else </span>{ |
| folder.consume(right) |
| } |
| } <span class="kw">else </span>{ |
| <span class="comment">// We know there are no separators at all. Return our whole data. |
| </span><span class="kw">if </span>skip_last { |
| folder |
| } <span class="kw">else </span>{ |
| folder.consume(data) |
| } |
| } |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'p</span>, P, V> UnindexedProducer <span class="kw">for </span>SplitProducer<<span class="lifetime">'p</span>, P, V> |
| <span class="kw">where |
| </span>V: Fissile<P> + Send, |
| P: Sync, |
| { |
| <span class="kw">type </span>Item = V; |
| |
| <span class="kw">fn </span>split(<span class="self">self</span>) -> (<span class="self">Self</span>, <span class="prelude-ty">Option</span><<span class="self">Self</span>>) { |
| <span class="comment">// Look forward for the separator, and failing that look backward. |
| </span><span class="kw">let </span>mid = <span class="self">self</span>.data.midpoint(<span class="self">self</span>.tail); |
| <span class="kw">let </span>index = <span class="kw">match </span><span class="self">self</span>.data.find(<span class="self">self</span>.separator, mid, <span class="self">self</span>.tail) { |
| <span class="prelude-val">Some</span>(i) => <span class="prelude-val">Some</span>(mid + i), |
| <span class="prelude-val">None </span>=> <span class="self">self</span>.data.rfind(<span class="self">self</span>.separator, mid), |
| }; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(index) = index { |
| <span class="kw">let </span>len = <span class="self">self</span>.data.length(); |
| <span class="kw">let </span>(left, right) = <span class="self">self</span>.data.split_once(index); |
| |
| <span class="kw">let </span>(left_tail, right_tail) = <span class="kw">if </span>index < mid { |
| <span class="comment">// If we scanned backwards to find the separator, everything in |
| // the right side is exhausted, with no separators left to find. |
| </span>(index, <span class="number">0</span>) |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>right_index = len - right.length(); |
| (mid, <span class="self">self</span>.tail - right_index) |
| }; |
| |
| <span class="comment">// Create the left split before the separator. |
| </span><span class="kw">let </span>left = SplitProducer { |
| data: left, |
| tail: left_tail, |
| ..<span class="self">self |
| </span>}; |
| |
| <span class="comment">// Create the right split following the separator. |
| </span><span class="kw">let </span>right = SplitProducer { |
| data: right, |
| tail: right_tail, |
| ..<span class="self">self |
| </span>}; |
| |
| (left, <span class="prelude-val">Some</span>(right)) |
| } <span class="kw">else </span>{ |
| <span class="comment">// The search is exhausted, no more separators... |
| </span>(SplitProducer { tail: <span class="number">0</span>, ..<span class="self">self </span>}, <span class="prelude-val">None</span>) |
| } |
| } |
| |
| <span class="kw">fn </span>fold_with<F>(<span class="self">self</span>, folder: F) -> F |
| <span class="kw">where |
| </span>F: Folder<<span class="self">Self</span>::Item>, |
| { |
| <span class="self">self</span>.fold_with(folder, <span class="bool-val">false</span>) |
| } |
| } |
| </code></pre></div> |
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