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<!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="Ariadne"><title>ariadne - Rust</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../" data-static-root-path="../static.files/" data-current-crate="ariadne" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0 (051478957 2024-07-21)" data-channel="1.80.0" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../static.files/storage-118b08c4c78b968e.js"></script><script defer src="../crates.js"></script><script defer src="../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="alternate icon" type="image/png" href="../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc mod crate"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="mobile-topbar"><button class="sidebar-menu-toggle" title="show sidebar"></button></nav><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../ariadne/index.html">ariadne</a><span class="version">0.4.1</span></h2></div><div class="sidebar-elems"><ul class="block"><li><a id="all-types" href="all.html">All Items</a></li></ul><section><ul class="block"><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li><li><a href="#functions">Functions</a></li></ul></section></div></nav><div class="sidebar-resizer"></div><main><div class="width-limiter"><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1>Crate <a class="mod" href="#">ariadne</a><button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><span class="out-of-band"><a class="src" href="../src/ariadne/lib.rs.html#1-536">source</a> · <button id="toggle-all-docs" title="collapse all docs">[<span>&#x2212;</span>]</button></span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><h2 id="ariadne"><a class="doc-anchor" href="#ariadne">§</a>Ariadne</h2>
<p><a href="https://crates.io/crates/ariadne"><img src="https://img.shields.io/crates/v/ariadne.svg" alt="crates.io" /></a>
<a href="https://docs.rs/ariadne"><img src="https://docs.rs/ariadne/badge.svg" alt="crates.io" /></a>
<a href="https://github.com/zesterer/ariadne"><img src="https://img.shields.io/badge/license-MIT%2FApache--2.0-blue.svg" alt="License" /></a>
<img src="https://github.com/zesterer/ariadne/workflows/Rust/badge.svg?branch=main" alt="actions-badge" /></p>
<p>A fancy compiler diagnostics crate.</p>
<h3 id="example"><a class="doc-anchor" href="#example">§</a>Example</h3><a href = "https://github.com/zesterer/ariadne/blob/main/examples/multiline.rs">
<img src="https://raw.githubusercontent.com/zesterer/ariadne/main/misc/example.png" alt="Ariadne supports arbitrary multi-line spans"/>
</a>
<div class="example-wrap ignore"><a href="#" class="tooltip" title="This example is not tested"></a><pre class="rust rust-example-rendered"><code><span class="kw">fn </span>main() {
<span class="kw">use </span>ariadne::{Color, ColorGenerator, Fmt, Label, Report, ReportKind, Source};
<span class="kw">let </span><span class="kw-2">mut </span>colors = ColorGenerator::new();
<span class="comment">// Generate &amp; choose some colours for each of our elements
</span><span class="kw">let </span>a = colors.next();
<span class="kw">let </span>b = colors.next();
<span class="kw">let </span>out = Color::Fixed(<span class="number">81</span>);
Report::build(ReportKind::Error, <span class="string">"sample.tao"</span>, <span class="number">12</span>)
.with_code(<span class="number">3</span>)
.with_message(<span class="macro">format!</span>(<span class="string">"Incompatible types"</span>))
.with_label(
Label::new((<span class="string">"sample.tao"</span>, <span class="number">32</span>..<span class="number">33</span>))
.with_message(<span class="macro">format!</span>(<span class="string">"This is of type {}"</span>, <span class="string">"Nat"</span>.fg(a)))
.with_color(a),
)
.with_label(
Label::new((<span class="string">"sample.tao"</span>, <span class="number">42</span>..<span class="number">45</span>))
.with_message(<span class="macro">format!</span>(<span class="string">"This is of type {}"</span>, <span class="string">"Str"</span>.fg(b)))
.with_color(b),
)
.with_label(
Label::new((<span class="string">"sample.tao"</span>, <span class="number">11</span>..<span class="number">48</span>))
.with_message(<span class="macro">format!</span>(
<span class="string">"The values are outputs of this {} expression"</span>,
<span class="string">"match"</span>.fg(out),
))
.with_color(out),
)
.with_note(<span class="macro">format!</span>(
<span class="string">"Outputs of {} expressions must coerce to the same type"</span>,
<span class="string">"match"</span>.fg(out)
))
.finish()
.print((<span class="string">"sample.tao"</span>, Source::from(<span class="macro">include_str!</span>(<span class="string">"sample.tao"</span>))))
.unwrap();
}</code></pre></div>
<p>See <a href="https://github.com/zesterer/ariadne/tree/main/examples"><code>examples/</code></a> for more examples.</p>
<h3 id="usage"><a class="doc-anchor" href="#usage">§</a>Usage</h3>
<p>For each error you wish to report:</p>
<ul>
<li>Call <code>Report::build()</code> to create a <code>ReportBuilder</code>.</li>
<li>Assign whatever details are appropriate to the error using the various
methods, and then call the <code>finish</code> method to get a <code>Report</code>.</li>
<li>For each <code>Report</code>, call <code>print</code> or <code>eprint</code> to write the report
directly to <code>stdout</code> or <code>stderr</code>. Alternately, you can use
<code>write</code> to send the report to any other <code>Write</code> destination (such as a file).</li>
</ul>
<h3 id="about"><a class="doc-anchor" href="#about">§</a>About</h3>
<p><code>ariadne</code> is a sister project of <a href="https://github.com/zesterer/chumsky/"><code>chumsky</code></a>. Neither are dependent on
one-another, but Im working on both simultaneously and like to think that their features complement each other. If
youre thinking of using <code>ariadne</code> to process your compilers output, why not try using <code>chumsky</code> to process its input?</p>
<h3 id="features"><a class="doc-anchor" href="#features">§</a>Features</h3>
<ul>
<li>Inline and multi-line labels capable of handling arbitrary configurations of spans</li>
<li>Multi-file errors</li>
<li>Generic across custom spans and file caches</li>
<li>A choice of character sets to ensure compatibility</li>
<li>Coloured labels &amp; highlighting with 8-bit and 24-bit color support (thanks to
<a href="https://github.com/SergioBenitez/yansi"><code>yansi</code></a>)</li>
<li>Label priority and ordering</li>
<li>Compact mode for smaller diagnostics</li>
<li>Correct handling of variable-width characters such as tabs</li>
<li>A <code>ColorGenerator</code> type that generates distinct colours for visual elements.</li>
<li>A plethora of other options (tab width, label attach points, underlines, etc.)</li>
<li>Built-in ordering/overlap heuristics that come up with the best way to avoid overlapping &amp; label crossover</li>
</ul>
<h3 id="cargo-features"><a class="doc-anchor" href="#cargo-features">§</a>Cargo Features</h3>
<ul>
<li><code>&quot;concolor&quot;</code> enables integration with the <a href="https://crates.io/crates/concolor"><code>concolor</code></a> crate for global color output
control across your application</li>
<li><code>&quot;auto-color&quot;</code> enables <code>concolor</code>s <code>&quot;auto&quot;</code> feature for automatic color control</li>
</ul>
<p><code>concolor</code>s features should be defined by the top-level binary crate, but without any features enabled <code>concolor</code> does
nothing. If <code>ariadne</code> is your only dependency using <code>concolor</code> then <code>&quot;auto-color&quot;</code> provides a convenience to enable
<code>concolor</code>s automatic color support detection, i.e. this:</p>
<div class="example-wrap"><pre class="language-TOML"><code>[dependencies]
ariadne = { version = &quot;...&quot;, features = [&quot;auto-color&quot;] }
</code></pre></div>
<p>is equivalent to this:</p>
<div class="example-wrap"><pre class="language-TOML"><code>[dependencies]
ariadne = { version = &quot;...&quot;, features = [&quot;concolor&quot;] }
concolor = { version = &quot;...&quot;, features = [&quot;auto&quot;] }
</code></pre></div><h3 id="planned-features"><a class="doc-anchor" href="#planned-features">§</a>Planned Features</h3>
<ul>
<li>Improved layout planning &amp; space usage</li>
<li>Non-ANSI terminal support</li>
<li>More accessibility options (screenreader-friendly mode, textured highlighting as an alternative to color, etc.)</li>
<li>More color options</li>
<li>Better support for layout restrictions (maximum terminal width, for example)</li>
</ul>
<h3 id="stability"><a class="doc-anchor" href="#stability">§</a>Stability</h3>
<p>The API (should) follow <a href="https://www.semver.org/">semver</a>. However, this does not apply to the layout of final error
messages. Minor tweaks to the internal layout heuristics can often result in the exact format of error messages changing
with labels moving slightly. If you experience a change in layout that you believe to be a regression (either the change
is incorrect, or makes your diagnostics harder to read) then please open an issue.</p>
<h3 id="credit"><a class="doc-anchor" href="#credit">§</a>Credit</h3>
<p>Thanks to:</p>
<ul>
<li>
<p><code>@brendanzab</code> for their beautiful <a href="https://github.com/brendanzab/codespan"><code>codespan</code></a> crate that inspired me to try
pushing the envelope of error diagnostics.</p>
</li>
<li>
<p><code>@estebank</code> for showing innumerable people just how good compiler diagnostics can be through their work on Rust.</p>
</li>
</ul>
</div></details><h2 id="structs" class="section-header">Structs<a href="#structs" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="struct" href="struct.ColorGenerator.html" title="struct ariadne::ColorGenerator">ColorGenerator</a></div><div class="desc docblock-short">A type that can generate distinct 8-bit colors.</div></li><li><div class="item-name"><a class="struct" href="struct.Config.html" title="struct ariadne::Config">Config</a></div><div class="desc docblock-short">A type used to configure a report</div></li><li><div class="item-name"><a class="struct" href="struct.FileCache.html" title="struct ariadne::FileCache">FileCache</a></div><div class="desc docblock-short">A <a href="trait.Cache.html" title="trait ariadne::Cache"><code>Cache</code></a> that fetches <a href="struct.Source.html" title="struct ariadne::Source"><code>Source</code></a>s from the filesystem.</div></li><li><div class="item-name"><a class="struct" href="struct.FnCache.html" title="struct ariadne::FnCache">FnCache</a></div><div class="desc docblock-short">A <a href="trait.Cache.html" title="trait ariadne::Cache"><code>Cache</code></a> that fetches <a href="struct.Source.html" title="struct ariadne::Source"><code>Source</code></a>s using the provided function.</div></li><li><div class="item-name"><a class="struct" href="struct.Label.html" title="struct ariadne::Label">Label</a></div><div class="desc docblock-short">A type that represents a labelled section of source code.</div></li><li><div class="item-name"><a class="struct" href="struct.Line.html" title="struct ariadne::Line">Line</a></div><div class="desc docblock-short">A type representing a single line of a <a href="struct.Source.html" title="struct ariadne::Source"><code>Source</code></a>.</div></li><li><div class="item-name"><a class="struct" href="struct.Report.html" title="struct ariadne::Report">Report</a></div><div class="desc docblock-short">A type representing a diagnostic that is ready to be written to output.</div></li><li><div class="item-name"><a class="struct" href="struct.ReportBuilder.html" title="struct ariadne::ReportBuilder">ReportBuilder</a></div><div class="desc docblock-short">A type used to build a <a href="struct.Report.html" title="struct ariadne::Report"><code>Report</code></a>.</div></li><li><div class="item-name"><a class="struct" href="struct.Source.html" title="struct ariadne::Source">Source</a></div><div class="desc docblock-short">A type representing a single source that may be referred to by <a href="trait.Span.html" title="trait ariadne::Span"><code>Span</code></a>s.</div></li></ul><h2 id="enums" class="section-header">Enums<a href="#enums" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="enum" href="enum.CharSet.html" title="enum ariadne::CharSet">CharSet</a></div><div class="desc docblock-short">Possible character sets to use when rendering diagnostics.</div></li><li><div class="item-name"><a class="enum" href="enum.Color.html" title="enum ariadne::Color">Color</a></div><div class="desc docblock-short">Enum representing a terminal color.</div></li><li><div class="item-name"><a class="enum" href="enum.IndexType.html" title="enum ariadne::IndexType">IndexType</a></div><div class="desc docblock-short">Possible character sets to use when rendering diagnostics.</div></li><li><div class="item-name"><a class="enum" href="enum.LabelAttach.html" title="enum ariadne::LabelAttach">LabelAttach</a></div><div class="desc docblock-short">The attachment point of inline label arrows</div></li><li><div class="item-name"><a class="enum" href="enum.ReportKind.html" title="enum ariadne::ReportKind">ReportKind</a></div><div class="desc docblock-short">A type that defines the kind of report being produced.</div></li></ul><h2 id="traits" class="section-header">Traits<a href="#traits" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="trait" href="trait.Cache.html" title="trait ariadne::Cache">Cache</a></div><div class="desc docblock-short">A trait implemented by <a href="struct.Source.html" title="struct ariadne::Source"><code>Source</code></a> caches.</div></li><li><div class="item-name"><a class="trait" href="trait.Fmt.html" title="trait ariadne::Fmt">Fmt</a></div><div class="desc docblock-short">A trait used to add formatting attributes to displayable items.</div></li><li><div class="item-name"><a class="trait" href="trait.Span.html" title="trait ariadne::Span">Span</a></div><div class="desc docblock-short">A trait implemented by spans within a character-based source.</div></li><li><div class="item-name"><a class="trait" href="trait.StdoutFmt.html" title="trait ariadne::StdoutFmt">StdoutFmt</a></div><div class="desc docblock-short">A trait used to add formatting attributes to displayable items intended to be written to <code>stdout</code>.</div></li></ul><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><ul class="item-table"><li><div class="item-name"><a class="fn" href="fn.sources.html" title="fn ariadne::sources">sources</a></div><div class="desc docblock-short">Create a <a href="trait.Cache.html" title="trait ariadne::Cache"><code>Cache</code></a> from a collection of ID/strings, where each corresponds to a <a href="struct.Source.html" title="struct ariadne::Source"><code>Source</code></a>.</div></li></ul></section></div></main></body></html>