| <!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/textwrap-0.11.0/src/indentation.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>indentation.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="../../textwrap/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="../../textwrap/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">//! Functions related to adding and removing indentation from lines of |
| //! text. |
| //! |
| //! The functions here can be used to uniformly indent or dedent |
| //! (unindent) word wrapped lines of text. |
| |
| /// Add prefix to each non-empty line. |
| /// |
| /// ``` |
| /// use textwrap::indent; |
| /// |
| /// assert_eq!(indent(" |
| /// Foo |
| /// Bar |
| /// ", " "), " |
| /// Foo |
| /// Bar |
| /// "); |
| /// ``` |
| /// |
| /// Empty lines (lines consisting only of whitespace) are not indented |
| /// and the whitespace is replaced by a single newline (`\n`): |
| /// |
| /// ``` |
| /// use textwrap::indent; |
| /// |
| /// assert_eq!(indent(" |
| /// Foo |
| /// |
| /// Bar |
| /// \t |
| /// Baz |
| /// ", "->"), " |
| /// ->Foo |
| /// |
| /// ->Bar |
| /// |
| /// ->Baz |
| /// "); |
| /// ``` |
| /// |
| /// Leading and trailing whitespace on non-empty lines is kept |
| /// unchanged: |
| /// |
| /// ``` |
| /// use textwrap::indent; |
| /// |
| /// assert_eq!(indent(" \t Foo ", "->"), "-> \t Foo \n"); |
| /// ``` |
| </span><span class="kw">pub fn </span>indent(s: <span class="kw-2">&</span>str, prefix: <span class="kw-2">&</span>str) -> String { |
| <span class="kw">let </span><span class="kw-2">mut </span>result = String::new(); |
| <span class="kw">for </span>line <span class="kw">in </span>s.lines() { |
| <span class="kw">if </span>line.chars().any(|c| !c.is_whitespace()) { |
| result.push_str(prefix); |
| result.push_str(line); |
| } |
| result.push(<span class="string">'\n'</span>); |
| } |
| result |
| } |
| |
| <span class="doccomment">/// Removes common leading whitespace from each line. |
| /// |
| /// This function will look at each non-empty line and determine the |
| /// maximum amount of whitespace that can be removed from all lines: |
| /// |
| /// ``` |
| /// use textwrap::dedent; |
| /// |
| /// assert_eq!(dedent(" |
| /// 1st line |
| /// 2nd line |
| /// 3rd line |
| /// "), " |
| /// 1st line |
| /// 2nd line |
| /// 3rd line |
| /// "); |
| /// ``` |
| </span><span class="kw">pub fn </span>dedent(s: <span class="kw-2">&</span>str) -> String { |
| <span class="kw">let </span><span class="kw-2">mut </span>prefix = <span class="string">""</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>lines = s.lines(); |
| |
| <span class="comment">// We first search for a non-empty line to find a prefix. |
| </span><span class="kw">for </span>line <span class="kw">in </span><span class="kw-2">&mut </span>lines { |
| <span class="kw">let </span><span class="kw-2">mut </span>whitespace_idx = line.len(); |
| <span class="kw">for </span>(idx, ch) <span class="kw">in </span>line.char_indices() { |
| <span class="kw">if </span>!ch.is_whitespace() { |
| whitespace_idx = idx; |
| <span class="kw">break</span>; |
| } |
| } |
| |
| <span class="comment">// Check if the line had anything but whitespace |
| </span><span class="kw">if </span>whitespace_idx < line.len() { |
| prefix = <span class="kw-2">&</span>line[..whitespace_idx]; |
| <span class="kw">break</span>; |
| } |
| } |
| |
| <span class="comment">// We then continue looking through the remaining lines to |
| // possibly shorten the prefix. |
| </span><span class="kw">for </span>line <span class="kw">in </span><span class="kw-2">&mut </span>lines { |
| <span class="kw">let </span><span class="kw-2">mut </span>whitespace_idx = line.len(); |
| <span class="kw">for </span>((idx, a), b) <span class="kw">in </span>line.char_indices().zip(prefix.chars()) { |
| <span class="kw">if </span>a != b { |
| whitespace_idx = idx; |
| <span class="kw">break</span>; |
| } |
| } |
| |
| <span class="comment">// Check if the line had anything but whitespace and if we |
| // have found a shorter prefix |
| </span><span class="kw">if </span>whitespace_idx < line.len() && whitespace_idx < prefix.len() { |
| prefix = <span class="kw-2">&</span>line[..whitespace_idx]; |
| } |
| } |
| |
| <span class="comment">// We now go over the lines a second time to build the result. |
| </span><span class="kw">let </span><span class="kw-2">mut </span>result = String::new(); |
| <span class="kw">for </span>line <span class="kw">in </span>s.lines() { |
| <span class="kw">if </span>line.starts_with(<span class="kw-2">&</span>prefix) && line.chars().any(|c| !c.is_whitespace()) { |
| <span class="kw">let </span>(<span class="kw">_</span>, tail) = line.split_at(prefix.len()); |
| result.push_str(tail); |
| } |
| result.push(<span class="string">'\n'</span>); |
| } |
| |
| <span class="kw">if </span>result.ends_with(<span class="string">'\n'</span>) && !s.ends_with(<span class="string">'\n'</span>) { |
| <span class="kw">let </span>new_len = result.len() - <span class="number">1</span>; |
| result.truncate(new_len); |
| } |
| |
| result |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| |
| <span class="doccomment">/// Add newlines. Ensures that the final line in the vector also |
| /// has a newline. |
| </span><span class="kw">fn </span>add_nl(lines: <span class="kw-2">&</span>[<span class="kw-2">&</span>str]) -> String { |
| lines.join(<span class="string">"\n"</span>) + <span class="string">"\n" |
| </span>} |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>indent_empty() { |
| <span class="macro">assert_eq!</span>(indent(<span class="string">"\n"</span>, <span class="string">" "</span>), <span class="string">"\n"</span>); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>indent_nonempty() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">" foo"</span>, |
| <span class="string">"bar"</span>, |
| <span class="string">" baz"</span>]; |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">"// foo"</span>, |
| <span class="string">"//bar"</span>, |
| <span class="string">"// baz"</span>]; |
| <span class="macro">assert_eq!</span>(indent(<span class="kw-2">&</span>add_nl(<span class="kw-2">&</span>x), <span class="string">"//"</span>), add_nl(<span class="kw-2">&</span>y)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>indent_empty_line() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">" foo"</span>, |
| <span class="string">"bar"</span>, |
| <span class="string">""</span>, |
| <span class="string">" baz"</span>]; |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">"// foo"</span>, |
| <span class="string">"//bar"</span>, |
| <span class="string">""</span>, |
| <span class="string">"// baz"</span>]; |
| <span class="macro">assert_eq!</span>(indent(<span class="kw-2">&</span>add_nl(<span class="kw-2">&</span>x), <span class="string">"//"</span>), add_nl(<span class="kw-2">&</span>y)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>dedent_empty() { |
| <span class="macro">assert_eq!</span>(dedent(<span class="string">""</span>), <span class="string">""</span>); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>dedent_multi_line() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">" foo"</span>, |
| <span class="string">" bar"</span>, |
| <span class="string">" baz"</span>]; |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">" foo"</span>, |
| <span class="string">"bar"</span>, |
| <span class="string">" baz"</span>]; |
| <span class="macro">assert_eq!</span>(dedent(<span class="kw-2">&</span>add_nl(<span class="kw-2">&</span>x)), add_nl(<span class="kw-2">&</span>y)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>dedent_empty_line() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">" foo"</span>, |
| <span class="string">" bar"</span>, |
| <span class="string">" "</span>, |
| <span class="string">" baz"</span>]; |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">" foo"</span>, |
| <span class="string">"bar"</span>, |
| <span class="string">""</span>, |
| <span class="string">" baz"</span>]; |
| <span class="macro">assert_eq!</span>(dedent(<span class="kw-2">&</span>add_nl(<span class="kw-2">&</span>x)), add_nl(<span class="kw-2">&</span>y)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>dedent_blank_line() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">" foo"</span>, |
| <span class="string">""</span>, |
| <span class="string">" bar"</span>, |
| <span class="string">" foo"</span>, |
| <span class="string">" bar"</span>, |
| <span class="string">" baz"</span>]; |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">"foo"</span>, |
| <span class="string">""</span>, |
| <span class="string">" bar"</span>, |
| <span class="string">" foo"</span>, |
| <span class="string">" bar"</span>, |
| <span class="string">" baz"</span>]; |
| <span class="macro">assert_eq!</span>(dedent(<span class="kw-2">&</span>add_nl(<span class="kw-2">&</span>x)), add_nl(<span class="kw-2">&</span>y)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>dedent_whitespace_line() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">" foo"</span>, |
| <span class="string">" "</span>, |
| <span class="string">" bar"</span>, |
| <span class="string">" foo"</span>, |
| <span class="string">" bar"</span>, |
| <span class="string">" baz"</span>]; |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">"foo"</span>, |
| <span class="string">""</span>, |
| <span class="string">" bar"</span>, |
| <span class="string">" foo"</span>, |
| <span class="string">" bar"</span>, |
| <span class="string">" baz"</span>]; |
| <span class="macro">assert_eq!</span>(dedent(<span class="kw-2">&</span>add_nl(<span class="kw-2">&</span>x)), add_nl(<span class="kw-2">&</span>y)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>dedent_mixed_whitespace() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">"\tfoo"</span>, |
| <span class="string">" bar"</span>]; |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">"\tfoo"</span>, |
| <span class="string">" bar"</span>]; |
| <span class="macro">assert_eq!</span>(dedent(<span class="kw-2">&</span>add_nl(<span class="kw-2">&</span>x)), add_nl(<span class="kw-2">&</span>y)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>dedent_tabbed_whitespace() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">"\t\tfoo"</span>, |
| <span class="string">"\t\t\tbar"</span>]; |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">"foo"</span>, |
| <span class="string">"\tbar"</span>]; |
| <span class="macro">assert_eq!</span>(dedent(<span class="kw-2">&</span>add_nl(<span class="kw-2">&</span>x)), add_nl(<span class="kw-2">&</span>y)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>dedent_mixed_tabbed_whitespace() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">"\t \tfoo"</span>, |
| <span class="string">"\t \t\tbar"</span>]; |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">"foo"</span>, |
| <span class="string">"\tbar"</span>]; |
| <span class="macro">assert_eq!</span>(dedent(<span class="kw-2">&</span>add_nl(<span class="kw-2">&</span>x)), add_nl(<span class="kw-2">&</span>y)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>dedent_mixed_tabbed_whitespace2() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">"\t \tfoo"</span>, |
| <span class="string">"\t \tbar"</span>]; |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">"\tfoo"</span>, |
| <span class="string">" \tbar"</span>]; |
| <span class="macro">assert_eq!</span>(dedent(<span class="kw-2">&</span>add_nl(<span class="kw-2">&</span>x)), add_nl(<span class="kw-2">&</span>y)); |
| } |
| |
| <span class="attribute">#[test] |
| #[cfg_attr(rustfmt, rustfmt_skip)] |
| </span><span class="kw">fn </span>dedent_preserve_no_terminating_newline() { |
| <span class="kw">let </span>x = <span class="macro">vec!</span>[<span class="string">" foo"</span>, |
| <span class="string">" bar"</span>].join(<span class="string">"\n"</span>); |
| <span class="kw">let </span>y = <span class="macro">vec!</span>[<span class="string">"foo"</span>, |
| <span class="string">" bar"</span>].join(<span class="string">"\n"</span>); |
| <span class="macro">assert_eq!</span>(dedent(<span class="kw-2">&</span>x), y); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="textwrap" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
