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<h1>Protocols</h1>
<p>The following protocols are available globally.</p>
</div>
</section>
<section class="section">
<div class="section-content">
<div class="task-group">
<ul class="item-container">
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore7ASTRuleP"></a>
<a name="//apple_ref/swift/Protocol/ASTRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore7ASTRuleP">ASTRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A rule that leverages the Swift source&rsquo;s pre-typechecked Abstract Syntax Tree to recurse into the source&rsquo;s
structure, validating the rule recursively in nested source bodies.</p>
<a href="Protocols/ASTRule.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">ASTRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols/Rule.html">Rule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/ASTRule.swift#L5-L26">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore24CacheDescriptionProviderP"></a>
<a name="//apple_ref/swift/Protocol/CacheDescriptionProvider" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore24CacheDescriptionProviderP">CacheDescriptionProvider</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Interface providing access to a cache description.</p>
<a href="Protocols/CacheDescriptionProvider.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">CacheDescriptionProvider</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/CacheDescriptionProvider.swift#L2-L6">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore17AnyCollectingRuleP"></a>
<a name="//apple_ref/swift/Protocol/AnyCollectingRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore17AnyCollectingRuleP">AnyCollectingRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>Type-erased protocol used to check whether a rule is collectable.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">AnyCollectingRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols/Rule.html">Rule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/CollectingRule.swift#L2">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore14CollectingRuleP"></a>
<a name="//apple_ref/swift/Protocol/CollectingRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore14CollectingRuleP">CollectingRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A rule that requires knowledge of all other files being linted.</p>
<a href="Protocols/CollectingRule.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">CollectingRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols.html#/s:13SwiftLintCore17AnyCollectingRuleP">AnyCollectingRule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/CollectingRule.swift#L5-L43">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore25ConfigurationProviderRuleP"></a>
<a name="//apple_ref/swift/Protocol/ConfigurationProviderRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore25ConfigurationProviderRuleP">ConfigurationProviderRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A rule that is user-configurable.</p>
<a href="Protocols/ConfigurationProviderRule.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">ConfigurationProviderRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols/Rule.html">Rule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/Rule.swift#L100-L106">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore8ReporterP"></a>
<a name="//apple_ref/swift/Protocol/Reporter" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore8ReporterP">Reporter</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>An interface for reporting violations as strings.</p>
<a href="Protocols/Reporter.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">Reporter</span> <span class="p">:</span> <span class="kt">CustomStringConvertible</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/Reporter.swift#L2-L22">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore4RuleP"></a>
<a name="//apple_ref/swift/Protocol/Rule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore4RuleP">Rule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>An executable value that can identify issues (violations) in Swift source code.</p>
<a href="Protocols/Rule.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">Rule</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/Rule.swift#L5-L64">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore9OptInRuleP"></a>
<a name="//apple_ref/swift/Protocol/OptInRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore9OptInRuleP">OptInRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A rule that is not enabled by default. Rules conforming to this need to be explicitly enabled by users.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">OptInRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols/Rule.html">Rule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/Rule.swift#L97">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore15CorrectableRuleP"></a>
<a name="//apple_ref/swift/Protocol/CorrectableRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore15CorrectableRuleP">CorrectableRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A rule that can correct violations.</p>
<a href="Protocols/CorrectableRule.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">CorrectableRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols/Rule.html">Rule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/Rule.swift#L109-L136">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore27SubstitutionCorrectableRuleP"></a>
<a name="//apple_ref/swift/Protocol/SubstitutionCorrectableRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore27SubstitutionCorrectableRuleP">SubstitutionCorrectableRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A correctable rule that can apply its corrections by replacing the content of ranges in the offending file with
updated content.</p>
<a href="Protocols/SubstitutionCorrectableRule.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">SubstitutionCorrectableRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols/CorrectableRule.html">CorrectableRule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/Rule.swift#L149-L164">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore30SubstitutionCorrectableASTRuleP"></a>
<a name="//apple_ref/swift/Protocol/SubstitutionCorrectableASTRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore30SubstitutionCorrectableASTRuleP">SubstitutionCorrectableASTRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A <code><a href="Protocols/SubstitutionCorrectableRule.html">SubstitutionCorrectableRule</a></code> that is also an <code><a href="Protocols/ASTRule.html">ASTRule</a></code>.</p>
<a href="Protocols/SubstitutionCorrectableASTRule.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">SubstitutionCorrectableASTRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols/ASTRule.html">ASTRule</a></span><span class="p">,</span> <span class="kt"><a href="Protocols/SubstitutionCorrectableRule.html">SubstitutionCorrectableRule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/Rule.swift#L189-L199">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore17SourceKitFreeRuleP"></a>
<a name="//apple_ref/swift/Protocol/SourceKitFreeRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore17SourceKitFreeRuleP">SourceKitFreeRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A rule that does not need SourceKit to operate and can still operate even after SourceKit has crashed.</p>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">SourceKitFreeRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols/Rule.html">Rule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/Rule.swift#L211">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore12AnalyzerRuleP"></a>
<a name="//apple_ref/swift/Protocol/AnalyzerRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore12AnalyzerRuleP">AnalyzerRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A rule that can operate on the post-typechecked AST using compiler arguments. Performs rules that are more like
static analysis than syntactic checks.</p>
<a href="Protocols/AnalyzerRule.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">AnalyzerRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols.html#/s:13SwiftLintCore9OptInRuleP">OptInRule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/Rule.swift#L215">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore17RuleConfigurationP"></a>
<a name="//apple_ref/swift/Protocol/RuleConfiguration" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore17RuleConfigurationP">RuleConfiguration</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A configuration value for a rule to allow users to modify its behavior.</p>
<a href="Protocols/RuleConfiguration.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">RuleConfiguration</span><span class="o">&lt;</span><span class="kt">Parent</span><span class="o">&gt;</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/RuleConfiguration.swift#L2-L22">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore30SeverityBasedRuleConfigurationP"></a>
<a name="//apple_ref/swift/Protocol/SeverityBasedRuleConfiguration" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore30SeverityBasedRuleConfigurationP">SeverityBasedRuleConfiguration</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A configuration for a rule that allows to configure at least the severity.</p>
<a href="Protocols/SeverityBasedRuleConfiguration.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">SeverityBasedRuleConfiguration</span> <span class="p">:</span> <span class="kt"><a href="Protocols/RuleConfiguration.html">RuleConfiguration</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/RuleConfiguration.swift#L25-L28">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore0A21SyntaxCorrectableRuleP"></a>
<a name="//apple_ref/swift/Protocol/SwiftSyntaxCorrectableRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore0A21SyntaxCorrectableRuleP">SwiftSyntaxCorrectableRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A SwiftLint CorrectableRule that performs its corrections using a SwiftSyntax <code>SyntaxRewriter</code>.</p>
<a href="Protocols/SwiftSyntaxCorrectableRule.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">SwiftSyntaxCorrectableRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols/CorrectableRule.html">CorrectableRule</a></span><span class="p">,</span> <span class="kt"><a href="Protocols/SwiftSyntaxRule.html">SwiftSyntaxRule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/SwiftSyntaxCorrectableRule.swift#L4-L11">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore24ViolationsSyntaxRewriterP"></a>
<a name="//apple_ref/swift/Protocol/ViolationsSyntaxRewriter" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore24ViolationsSyntaxRewriterP">ViolationsSyntaxRewriter</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A SwiftSyntax <code>SyntaxRewriter</code> that produces absolute positions where corrections were applied.</p>
<a href="Protocols/ViolationsSyntaxRewriter.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">ViolationsSyntaxRewriter</span> <span class="p">:</span> <span class="kt">SyntaxRewriter</span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/SwiftSyntaxCorrectableRule.swift#L36-L39">Show on GitHub</a>
</div>
</section>
</div>
</li>
<li class="item">
<div>
<code>
<a name="/s:13SwiftLintCore0A10SyntaxRuleP"></a>
<a name="//apple_ref/swift/Protocol/SwiftSyntaxRule" class="dashAnchor"></a>
<a class="token" href="#/s:13SwiftLintCore0A10SyntaxRuleP">SwiftSyntaxRule</a>
</code>
</div>
<div class="height-container">
<div class="pointer-container"></div>
<section class="section">
<div class="pointer"></div>
<div class="abstract">
<p>A SwiftLint Rule backed by SwiftSyntax that does not use SourceKit requests.</p>
<a href="Protocols/SwiftSyntaxRule.html" class="slightly-smaller">See more</a>
</div>
<div class="declaration">
<h4>Declaration</h4>
<div class="language">
<p class="aside-title">Swift</p>
<pre class="highlight swift"><code><span class="kd">public</span> <span class="kd">protocol</span> <span class="kt">SwiftSyntaxRule</span> <span class="p">:</span> <span class="kt"><a href="Protocols.html#/s:13SwiftLintCore17SourceKitFreeRuleP">SourceKitFreeRule</a></span></code></pre>
</div>
</div>
<div class="slightly-smaller">
<a href="https://github.com/realm/SwiftLint/tree/main/Source/SwiftLintCore/Protocols/SwiftSyntaxRule.swift#L4-L29">Show on GitHub</a>
</div>
</section>
</div>
</li>
</ul>
</div>
</div>
</section>
</article>
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<p>© 2023 <a class="link" href="https://jpsim.com" target="_blank" rel="external noopener">JP Simard</a> under MIT.</p>
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