| <!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/ansi_term-0.12.1/src/difference.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>difference.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="../../ansi_term/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="../../ansi_term/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><span class="kw">super</span>::Style; |
| |
| |
| <span class="doccomment">/// When printing out one coloured string followed by another, use one of |
| /// these rules to figure out which *extra* control codes need to be sent. |
| </span><span class="attribute">#[derive(PartialEq, Clone, Copy, Debug)] |
| </span><span class="kw">pub enum </span>Difference { |
| |
| <span class="doccomment">/// Print out the control codes specified by this style to end up looking |
| /// like the second string's styles. |
| </span>ExtraStyles(Style), |
| |
| <span class="doccomment">/// Converting between these two is impossible, so just send a reset |
| /// command and then the second string's styles. |
| </span>Reset, |
| |
| <span class="doccomment">/// The before style is exactly the same as the after style, so no further |
| /// control codes need to be printed. |
| </span>NoDifference, |
| } |
| |
| |
| <span class="kw">impl </span>Difference { |
| |
| <span class="doccomment">/// Compute the 'style difference' required to turn an existing style into |
| /// the given, second style. |
| /// |
| /// For example, to turn green text into green bold text, it's redundant |
| /// to write a reset command then a second green+bold command, instead of |
| /// just writing one bold command. This method should see that both styles |
| /// use the foreground colour green, and reduce it to a single command. |
| /// |
| /// This method returns an enum value because it's not actually always |
| /// possible to turn one style into another: for example, text could be |
| /// made bold and underlined, but you can't remove the bold property |
| /// without also removing the underline property. So when this has to |
| /// happen, this function returns None, meaning that the entire set of |
| /// styles should be reset and begun again. |
| </span><span class="kw">pub fn </span>between(first: <span class="kw-2">&</span>Style, next: <span class="kw-2">&</span>Style) -> Difference { |
| <span class="kw">use </span><span class="self">self</span>::Difference::<span class="kw-2">*</span>; |
| |
| <span class="comment">// XXX(Havvy): This algorithm is kind of hard to replicate without |
| // having the Plain/Foreground enum variants, so I'm just leaving |
| // it commented out for now, and defaulting to Reset. |
| |
| </span><span class="kw">if </span>first == next { |
| <span class="kw">return </span>NoDifference; |
| } |
| |
| <span class="comment">// Cannot un-bold, so must Reset. |
| </span><span class="kw">if </span>first.is_bold && !next.is_bold { |
| <span class="kw">return </span>Reset; |
| } |
| |
| <span class="kw">if </span>first.is_dimmed && !next.is_dimmed { |
| <span class="kw">return </span>Reset; |
| } |
| |
| <span class="kw">if </span>first.is_italic && !next.is_italic { |
| <span class="kw">return </span>Reset; |
| } |
| |
| <span class="comment">// Cannot un-underline, so must Reset. |
| </span><span class="kw">if </span>first.is_underline && !next.is_underline { |
| <span class="kw">return </span>Reset; |
| } |
| |
| <span class="kw">if </span>first.is_blink && !next.is_blink { |
| <span class="kw">return </span>Reset; |
| } |
| |
| <span class="kw">if </span>first.is_reverse && !next.is_reverse { |
| <span class="kw">return </span>Reset; |
| } |
| |
| <span class="kw">if </span>first.is_hidden && !next.is_hidden { |
| <span class="kw">return </span>Reset; |
| } |
| |
| <span class="kw">if </span>first.is_strikethrough && !next.is_strikethrough { |
| <span class="kw">return </span>Reset; |
| } |
| |
| <span class="comment">// Cannot go from foreground to no foreground, so must Reset. |
| </span><span class="kw">if </span>first.foreground.is_some() && next.foreground.is_none() { |
| <span class="kw">return </span>Reset; |
| } |
| |
| <span class="comment">// Cannot go from background to no background, so must Reset. |
| </span><span class="kw">if </span>first.background.is_some() && next.background.is_none() { |
| <span class="kw">return </span>Reset; |
| } |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>extra_styles = Style::default(); |
| |
| <span class="kw">if </span>first.is_bold != next.is_bold { |
| extra_styles.is_bold = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">if </span>first.is_dimmed != next.is_dimmed { |
| extra_styles.is_dimmed = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">if </span>first.is_italic != next.is_italic { |
| extra_styles.is_italic = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">if </span>first.is_underline != next.is_underline { |
| extra_styles.is_underline = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">if </span>first.is_blink != next.is_blink { |
| extra_styles.is_blink = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">if </span>first.is_reverse != next.is_reverse { |
| extra_styles.is_reverse = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">if </span>first.is_hidden != next.is_hidden { |
| extra_styles.is_hidden = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">if </span>first.is_strikethrough != next.is_strikethrough { |
| extra_styles.is_strikethrough = <span class="bool-val">true</span>; |
| } |
| |
| <span class="kw">if </span>first.foreground != next.foreground { |
| extra_styles.foreground = next.foreground; |
| } |
| |
| <span class="kw">if </span>first.background != next.background { |
| extra_styles.background = next.background; |
| } |
| |
| ExtraStyles(extra_styles) |
| } |
| } |
| |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>test { |
| <span class="kw">use super</span>::<span class="kw-2">*</span>; |
| <span class="kw">use </span><span class="kw">super</span>::Difference::<span class="kw-2">*</span>; |
| <span class="kw">use </span>style::Colour::<span class="kw-2">*</span>; |
| <span class="kw">use </span>style::Style; |
| |
| <span class="kw">fn </span>style() -> Style { |
| Style::new() |
| } |
| |
| <span class="macro">macro_rules! </span>test { |
| (<span class="macro-nonterminal">$name</span>: ident: <span class="macro-nonterminal">$first</span>: expr; <span class="macro-nonterminal">$next</span>: expr => <span class="macro-nonterminal">$result</span>: expr) => { |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span><span class="macro-nonterminal">$name</span>() { |
| <span class="macro">assert_eq!</span>(<span class="macro-nonterminal">$result</span>, Difference::between(<span class="kw-2">&</span><span class="macro-nonterminal">$first</span>, <span class="kw-2">&</span><span class="macro-nonterminal">$next</span>)); |
| } |
| }; |
| } |
| |
| <span class="macro">test!</span>(nothing: Green.normal(); Green.normal() => NoDifference); |
| <span class="macro">test!</span>(uppercase: Green.normal(); Green.bold() => ExtraStyles(style().bold())); |
| <span class="macro">test!</span>(lowercase: Green.bold(); Green.normal() => Reset); |
| <span class="macro">test!</span>(nothing2: Green.bold(); Green.bold() => NoDifference); |
| |
| <span class="macro">test!</span>(colour_change: Red.normal(); Blue.normal() => ExtraStyles(Blue.normal())); |
| |
| <span class="macro">test!</span>(addition_of_blink: style(); style().blink() => ExtraStyles(style().blink())); |
| <span class="macro">test!</span>(addition_of_dimmed: style(); style().dimmed() => ExtraStyles(style().dimmed())); |
| <span class="macro">test!</span>(addition_of_hidden: style(); style().hidden() => ExtraStyles(style().hidden())); |
| <span class="macro">test!</span>(addition_of_reverse: style(); style().reverse() => ExtraStyles(style().reverse())); |
| <span class="macro">test!</span>(addition_of_strikethrough: style(); style().strikethrough() => ExtraStyles(style().strikethrough())); |
| |
| <span class="macro">test!</span>(removal_of_strikethrough: style().strikethrough(); style() => Reset); |
| <span class="macro">test!</span>(removal_of_reverse: style().reverse(); style() => Reset); |
| <span class="macro">test!</span>(removal_of_hidden: style().hidden(); style() => Reset); |
| <span class="macro">test!</span>(removal_of_dimmed: style().dimmed(); style() => Reset); |
| <span class="macro">test!</span>(removal_of_blink: style().blink(); style() => Reset); |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="ansi_term" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |