| <!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/itertools-0.8.2/src/format.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>format.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="../../itertools/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="../../itertools/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="kw">use </span>std::fmt; |
| <span class="kw">use </span>std::cell::RefCell; |
| |
| <span class="doccomment">/// Format all iterator elements lazily, separated by `sep`. |
| /// |
| /// The format value can only be formatted once, after that the iterator is |
| /// exhausted. |
| /// |
| /// See [`.format_with()`](../trait.Itertools.html#method.format_with) for more information. |
| </span><span class="kw">pub struct </span>FormatWith<<span class="lifetime">'a</span>, I, F> { |
| sep: <span class="kw-2">&</span><span class="lifetime">'a </span>str, |
| <span class="doccomment">/// FormatWith uses interior mutability because Display::fmt takes &self. |
| </span>inner: RefCell<<span class="prelude-ty">Option</span><(I, F)>>, |
| } |
| |
| <span class="doccomment">/// Format all iterator elements lazily, separated by `sep`. |
| /// |
| /// The format value can only be formatted once, after that the iterator is |
| /// exhausted. |
| /// |
| /// See [`.format()`](../trait.Itertools.html#method.format) |
| /// for more information. |
| </span><span class="attribute">#[derive(Clone)] |
| </span><span class="kw">pub struct </span>Format<<span class="lifetime">'a</span>, I> { |
| sep: <span class="kw-2">&</span><span class="lifetime">'a </span>str, |
| <span class="doccomment">/// Format uses interior mutability because Display::fmt takes &self. |
| </span>inner: RefCell<<span class="prelude-ty">Option</span><I>>, |
| } |
| |
| <span class="kw">pub fn </span>new_format<<span class="lifetime">'a</span>, I, F>(iter: I, separator: <span class="kw-2">&</span><span class="lifetime">'a </span>str, f: F) -> FormatWith<<span class="lifetime">'a</span>, I, F> |
| <span class="kw">where </span>I: Iterator, |
| F: FnMut(I::Item, <span class="kw-2">&mut </span>FnMut(<span class="kw-2">&</span>fmt::Display) -> fmt::Result) -> fmt::Result |
| { |
| FormatWith { |
| sep: separator, |
| inner: RefCell::new(<span class="prelude-val">Some</span>((iter, f))), |
| } |
| } |
| |
| <span class="kw">pub fn </span>new_format_default<<span class="lifetime">'a</span>, I>(iter: I, separator: <span class="kw-2">&</span><span class="lifetime">'a </span>str) -> Format<<span class="lifetime">'a</span>, I> |
| <span class="kw">where </span>I: Iterator, |
| { |
| Format { |
| sep: separator, |
| inner: RefCell::new(<span class="prelude-val">Some</span>(iter)), |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I, F> fmt::Display <span class="kw">for </span>FormatWith<<span class="lifetime">'a</span>, I, F> |
| <span class="kw">where </span>I: Iterator, |
| F: FnMut(I::Item, <span class="kw-2">&mut </span>FnMut(<span class="kw-2">&</span>fmt::Display) -> fmt::Result) -> fmt::Result |
| { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="kw">let </span>(<span class="kw-2">mut </span>iter, <span class="kw-2">mut </span>format) = <span class="kw">match </span><span class="self">self</span>.inner.borrow_mut().take() { |
| <span class="prelude-val">Some</span>(t) => t, |
| <span class="prelude-val">None </span>=> <span class="macro">panic!</span>(<span class="string">"FormatWith: was already formatted once"</span>), |
| }; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(fst) = iter.next() { |
| <span class="macro">try!</span>(format(fst, <span class="kw-2">&mut </span>|disp: <span class="kw-2">&</span>fmt::Display| disp.fmt(f))); |
| <span class="kw">for </span>elt <span class="kw">in </span>iter { |
| <span class="kw">if </span><span class="self">self</span>.sep.len() > <span class="number">0 </span>{ |
| |
| <span class="macro">try!</span>(f.write_str(<span class="self">self</span>.sep)); |
| } |
| <span class="macro">try!</span>(format(elt, <span class="kw-2">&mut </span>|disp: <span class="kw-2">&</span>fmt::Display| disp.fmt(f))); |
| } |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I> Format<<span class="lifetime">'a</span>, I> |
| <span class="kw">where </span>I: Iterator, |
| { |
| <span class="kw">fn </span>format<F>(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter, <span class="kw-2">mut </span>cb: F) -> fmt::Result |
| <span class="kw">where </span>F: FnMut(<span class="kw-2">&</span>I::Item, <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result, |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>iter = <span class="kw">match </span><span class="self">self</span>.inner.borrow_mut().take() { |
| <span class="prelude-val">Some</span>(t) => t, |
| <span class="prelude-val">None </span>=> <span class="macro">panic!</span>(<span class="string">"Format: was already formatted once"</span>), |
| }; |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(fst) = iter.next() { |
| <span class="macro">try!</span>(cb(<span class="kw-2">&</span>fst, f)); |
| <span class="kw">for </span>elt <span class="kw">in </span>iter { |
| <span class="kw">if </span><span class="self">self</span>.sep.len() > <span class="number">0 </span>{ |
| <span class="macro">try!</span>(f.write_str(<span class="self">self</span>.sep)); |
| } |
| <span class="macro">try!</span>(cb(<span class="kw-2">&</span>elt, f)); |
| } |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| } |
| |
| <span class="macro">macro_rules! </span>impl_format { |
| ($(<span class="macro-nonterminal">$fmt_trait</span>:ident)<span class="kw-2">*</span>) => { |
| $( |
| <span class="kw">impl</span><<span class="lifetime">'a</span>, I> fmt::<span class="macro-nonterminal">$fmt_trait </span><span class="kw">for </span>Format<<span class="lifetime">'a</span>, I> |
| <span class="kw">where </span>I: Iterator, |
| I::Item: fmt::<span class="macro-nonterminal">$fmt_trait</span>, |
| { |
| <span class="kw">fn </span>fmt(<span class="kw-2">&</span><span class="self">self</span>, f: <span class="kw-2">&mut </span>fmt::Formatter) -> fmt::Result { |
| <span class="self">self</span>.format(f, fmt::<span class="macro-nonterminal">$fmt_trait::fmt</span>) |
| } |
| } |
| )* |
| } |
| } |
| |
| <span class="macro">impl_format!</span>{Display Debug |
| UpperExp LowerExp UpperHex LowerHex Octal Binary Pointer} |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="itertools" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
