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<section class="section">
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<div class="section-content top-matter">
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<h1 id='opening-brace-spacing' class='heading'>Opening Brace Spacing</h1>
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<p>The correct positioning of braces that introduce a block of code or member list is highly controversial. No matter which style is preferred, consistency is key. Apart from different tastes, the positioning of braces can also have a significant impact on the readability of the code, especially for visually impaired developers. This rule ensures that braces are preceded by a single space and on the same line as the declaration. Comments between the declaration and the opening brace are respected. Check out the <code><a href="contrasted_opening_brace.html">contrasted_opening_brace</a></code> rule for a different style.</p>
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<ul>
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<li><strong>Identifier:</strong> <code>opening_brace</code></li>
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<li><strong>Enabled by default:</strong> Yes</li>
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<li><strong>Supports autocorrection:</strong> Yes</li>
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<li><strong>Kind:</strong> style</li>
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<li><strong>Analyzer rule:</strong> No</li>
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<li><strong>Minimum Swift compiler version:</strong> 5.0.0</li>
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<li><strong>Default configuration:</strong>
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<table>
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<thead>
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<tr><th>Key</th><th>Value</th></tr>
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</thead>
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<tbody>
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<tr>
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<td>
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severity
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</td>
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<td>
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warning
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</td>
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</tr>
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<tr>
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<td>
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ignore_multiline_type_headers
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</td>
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<td>
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false
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</td>
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</tr>
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<tr>
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<td>
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ignore_multiline_statement_conditions
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</td>
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<td>
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false
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</td>
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</tr>
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<tr>
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<td>
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ignore_multiline_function_signatures
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</td>
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<td>
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false
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</td>
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</tr>
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<tr>
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<td>
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allow_multiline_func
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</td>
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<td>
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false
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</td>
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</tr>
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</tbody>
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</table></li>
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</ul>
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<h2 id='non-triggering-examples' class='heading'>Non Triggering Examples</h2>
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||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">abc</span><span class="p">()</span> <span class="p">{</span>
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<span class="p">}</span>
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</code></pre>
|
||
<pre class="highlight swift"><code><span class="p">[]</span><span class="o">.</span><span class="nf">map</span><span class="p">()</span> <span class="p">{</span> <span class="nv">$0</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="p">[]</span><span class="o">.</span><span class="nf">map</span><span class="p">({</span> <span class="p">})</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">if</span> <span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">b</span> <span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">while</span> <span class="n">a</span> <span class="o">==</span> <span class="n">b</span> <span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">guard</span> <span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">b</span> <span class="k">else</span> <span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">Rule</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">Parent</span> <span class="p">{</span>
|
||
<span class="kd">struct</span> <span class="kt">Child</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">foo</span><span class="p">:</span> <span class="kt">Int</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">rect</span><span class="p">:</span> <span class="kt">CGRect</span><span class="p">)</span> <span class="p">{</span>
|
||
<span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">centre</span> <span class="o">=</span> <span class="kt">CGPoint</span><span class="p">(</span><span class="nv">x</span><span class="p">:</span> <span class="n">rect</span><span class="o">.</span><span class="n">midX</span><span class="p">,</span> <span class="nv">y</span><span class="p">:</span> <span class="n">rect</span><span class="o">.</span><span class="n">midY</span><span class="p">)</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">centre</span><span class="p">)</span>
|
||
<span class="p">}()</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">(</span><span class="nv">rect</span><span class="p">:</span> <span class="kt">CGRect</span><span class="p">)</span> <span class="o">-></span> <span class="p">()</span> <span class="o">-></span> <span class="kt">Void</span> <span class="p">{</span>
|
||
<span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">centre</span> <span class="o">=</span> <span class="kt">CGPoint</span><span class="p">(</span><span class="nv">x</span><span class="p">:</span> <span class="n">rect</span><span class="o">.</span><span class="n">midX</span><span class="p">,</span> <span class="nv">y</span><span class="p">:</span> <span class="n">rect</span><span class="o">.</span><span class="n">midY</span><span class="p">)</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">centre</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">f</span><span class="p">()</span> <span class="o">-></span> <span class="p">()</span> <span class="o">-></span> <span class="kt">Void</span> <span class="p">{</span>
|
||
<span class="p">{}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">Rule</span><span class="p">:</span>
|
||
<span class="kt">NSObject</span> <span class="p">{</span>
|
||
<span class="k">var</span> <span class="nv">a</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span>
|
||
<span class="k">return</span> <span class="s">""</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">self</span><span class="o">.</span><span class="nf">foo</span><span class="p">(</span>
|
||
<span class="p">(</span>
|
||
<span class="s">"String parameter"</span><span class="p">,</span>
|
||
<span class="p">{</span> <span class="s">"Do something here"</span> <span class="p">}</span>
|
||
<span class="p">)</span>
|
||
<span class="p">)</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">pattern</span> <span class="o">=</span> <span class="sr">#/(\{(?<key>\w+)\})/#</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">if</span> <span class="n">c</span> <span class="p">{}</span>
|
||
<span class="k">else</span> <span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code> <span class="k">if</span> <span class="n">c</span> <span class="cm">/* comment */</span> <span class="p">{</span>
|
||
<span class="k">return</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<h2 id='triggering-examples' class='heading'>Triggering Examples</h2>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">abc</span><span class="p">()</span><span class="err">↓</span><span class="p">{</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">abc</span><span class="p">()</span>
|
||
<span class="err">↓</span><span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">abc</span><span class="p">(</span><span class="nv">a</span><span class="p">:</span> <span class="kt">A</span><span class="p">,</span>
|
||
<span class="nv">b</span><span class="p">:</span> <span class="kt">B</span><span class="p">)</span>
|
||
<span class="err">↓</span><span class="p">{</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="p">[]</span><span class="o">.</span><span class="nf">map</span><span class="p">()</span><span class="err">↓</span><span class="p">{</span> <span class="nv">$0</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">OldContentView</span><span class="p">:</span> <span class="kt">View</span> <span class="p">{</span>
|
||
<span class="kd">@State</span> <span class="kd">private</span> <span class="k">var</span> <span class="nv">showOptions</span> <span class="o">=</span> <span class="kc">false</span>
|
||
|
||
<span class="k">var</span> <span class="nv">body</span><span class="p">:</span> <span class="kd">some</span> <span class="kt">View</span> <span class="p">{</span>
|
||
<span class="kt">Button</span><span class="p">(</span><span class="nv">action</span><span class="p">:</span> <span class="p">{</span>
|
||
<span class="k">self</span><span class="o">.</span><span class="n">showOptions</span><span class="o">.</span><span class="nf">toggle</span><span class="p">()</span>
|
||
<span class="p">})</span><span class="err">↓</span><span class="p">{</span>
|
||
<span class="kt">Image</span><span class="p">(</span><span class="nv">systemName</span><span class="p">:</span> <span class="s">"gear"</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">OldContentView</span><span class="p">:</span> <span class="kt">View</span> <span class="p">{</span>
|
||
<span class="kd">@State</span> <span class="kd">private</span> <span class="k">var</span> <span class="nv">showOptions</span> <span class="o">=</span> <span class="kc">false</span>
|
||
|
||
<span class="k">var</span> <span class="nv">body</span><span class="p">:</span> <span class="kd">some</span> <span class="kt">View</span> <span class="p">{</span>
|
||
<span class="kt">Button</span><span class="p">(</span><span class="nv">action</span><span class="p">:</span> <span class="p">{</span>
|
||
<span class="k">self</span><span class="o">.</span><span class="n">showOptions</span><span class="o">.</span><span class="nf">toggle</span><span class="p">()</span>
|
||
<span class="p">})</span>
|
||
<span class="err">↓</span><span class="p">{</span>
|
||
<span class="kt">Image</span><span class="p">(</span><span class="nv">systemName</span><span class="p">:</span> <span class="s">"gear"</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">OldContentView</span><span class="p">:</span> <span class="kt">View</span> <span class="p">{</span>
|
||
<span class="kd">@State</span> <span class="kd">private</span> <span class="k">var</span> <span class="nv">showOptions</span> <span class="o">=</span> <span class="kc">false</span>
|
||
|
||
<span class="k">var</span> <span class="nv">body</span><span class="p">:</span> <span class="kd">some</span> <span class="kt">View</span> <span class="p">{</span>
|
||
<span class="kt">Button</span> <span class="p">{</span>
|
||
<span class="k">self</span><span class="o">.</span><span class="n">showOptions</span><span class="o">.</span><span class="nf">toggle</span><span class="p">()</span>
|
||
<span class="p">}</span> <span class="nv">label</span><span class="p">:</span><span class="err">↓</span><span class="p">{</span>
|
||
<span class="kt">Image</span><span class="p">(</span><span class="nv">systemName</span><span class="p">:</span> <span class="s">"gear"</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">if</span> <span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">b</span><span class="err">↓</span><span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">while</span> <span class="n">a</span> <span class="o">==</span> <span class="n">b</span><span class="err">↓</span><span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">guard</span> <span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">b</span> <span class="k">else</span><span class="err">↓</span><span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">if</span>
|
||
<span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">b</span><span class="p">,</span>
|
||
<span class="k">let</span> <span class="nv">c</span> <span class="o">=</span> <span class="n">d</span>
|
||
<span class="k">where</span> <span class="n">a</span> <span class="o">==</span> <span class="n">c</span><span class="err">↓</span><span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">while</span>
|
||
<span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">b</span><span class="p">,</span>
|
||
<span class="k">let</span> <span class="nv">c</span> <span class="o">=</span> <span class="n">d</span>
|
||
<span class="k">where</span> <span class="n">a</span> <span class="o">==</span> <span class="n">c</span><span class="err">↓</span><span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">guard</span>
|
||
<span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">b</span><span class="p">,</span>
|
||
<span class="k">let</span> <span class="nv">c</span> <span class="o">=</span> <span class="n">d</span>
|
||
<span class="k">where</span> <span class="n">a</span> <span class="o">==</span> <span class="n">c</span> <span class="k">else</span><span class="err">↓</span><span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">Rule</span><span class="err">↓</span><span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">Rule</span>
|
||
<span class="err">↓</span><span class="p">{</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">Rule</span>
|
||
|
||
<span class="err">↓</span><span class="p">{</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">struct</span> <span class="kt">Parent</span> <span class="p">{</span>
|
||
<span class="kd">struct</span> <span class="kt">Child</span>
|
||
<span class="err">↓</span><span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">foo</span><span class="p">:</span> <span class="kt">Int</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">switch</span> <span class="n">a</span><span class="err">↓</span><span class="p">{}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">if</span>
|
||
<span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">b</span><span class="p">,</span>
|
||
<span class="k">let</span> <span class="nv">c</span> <span class="o">=</span> <span class="n">d</span><span class="p">,</span>
|
||
<span class="n">a</span> <span class="o">==</span> <span class="n">c</span>
|
||
<span class="err">↓</span><span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">while</span>
|
||
<span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">b</span><span class="p">,</span>
|
||
<span class="k">let</span> <span class="nv">c</span> <span class="o">=</span> <span class="n">d</span><span class="p">,</span>
|
||
<span class="n">a</span> <span class="o">==</span> <span class="n">c</span>
|
||
<span class="err">↓</span><span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">guard</span>
|
||
<span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="n">b</span><span class="p">,</span>
|
||
<span class="k">let</span> <span class="nv">c</span> <span class="o">=</span> <span class="n">d</span><span class="p">,</span>
|
||
<span class="n">a</span> <span class="o">==</span> <span class="n">c</span> <span class="k">else</span>
|
||
<span class="err">↓</span><span class="p">{</span> <span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">Rule</span><span class="err">↓</span><span class="p">{}</span>
|
||
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">actor</span> <span class="kt">Rule</span><span class="err">↓</span><span class="p">{}</span>
|
||
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">enum</span> <span class="kt">Rule</span><span class="err">↓</span><span class="p">{}</span>
|
||
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">protocol</span> <span class="kt">Rule</span><span class="err">↓</span><span class="p">{}</span>
|
||
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">extension</span> <span class="kt">Rule</span><span class="err">↓</span><span class="p">{}</span>
|
||
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">Rule</span> <span class="p">{</span>
|
||
<span class="k">var</span> <span class="nv">a</span><span class="p">:</span> <span class="kt">String</span><span class="err">↓</span><span class="p">{</span>
|
||
<span class="k">return</span> <span class="s">""</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">class</span> <span class="kt">Rule</span> <span class="p">{</span>
|
||
<span class="k">var</span> <span class="nv">a</span><span class="p">:</span> <span class="kt">String</span> <span class="p">{</span>
|
||
<span class="k">willSet</span><span class="err">↓</span><span class="p">{</span>
|
||
|
||
<span class="p">}</span>
|
||
<span class="k">didSet</span> <span class="err">↓</span><span class="p">{</span>
|
||
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">precedencegroup</span> <span class="kt">Group</span><span class="err">↓</span><span class="p">{</span>
|
||
<span class="nv">assignment</span><span class="p">:</span> <span class="kc">true</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">if</span>
|
||
<span class="s">"test"</span><span class="o">.</span><span class="n">isEmpty</span>
|
||
<span class="err">↓</span><span class="p">{</span>
|
||
<span class="c1">// code here</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="kd">func</span> <span class="nf">fooFun</span><span class="p">()</span> <span class="p">{</span>
|
||
<span class="k">let</span> <span class="nv">foo</span><span class="p">:</span> <span class="kt">String</span><span class="p">?</span> <span class="o">=</span> <span class="s">"foo"</span>
|
||
<span class="k">let</span> <span class="nv">bar</span><span class="p">:</span> <span class="kt">String</span><span class="p">?</span> <span class="o">=</span> <span class="s">"bar"</span>
|
||
|
||
<span class="k">if</span>
|
||
<span class="k">let</span> <span class="nv">foo</span> <span class="o">=</span> <span class="n">foo</span><span class="p">,</span>
|
||
<span class="k">let</span> <span class="nv">bar</span> <span class="o">=</span> <span class="n">bar</span>
|
||
<span class="err">↓</span><span class="p">{</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">foo</span> <span class="o">+</span> <span class="n">bar</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">if</span>
|
||
<span class="k">let</span> <span class="nv">a</span> <span class="o">=</span> <span class="p">[</span><span class="s">"A"</span><span class="p">,</span> <span class="s">"B"</span><span class="p">]</span><span class="o">.</span><span class="n">first</span><span class="p">,</span>
|
||
<span class="k">let</span> <span class="nv">b</span> <span class="o">=</span> <span class="p">[</span><span class="s">"B"</span><span class="p">]</span><span class="o">.</span><span class="n">first</span>
|
||
<span class="err">↓</span><span class="p">{</span>
|
||
<span class="nf">print</span><span class="p">(</span><span class="n">a</span><span class="p">)</span>
|
||
<span class="p">}</span>
|
||
</code></pre>
|
||
<pre class="highlight swift"><code><span class="k">if</span> <span class="n">c</span> <span class="err">↓</span><span class="p">{}</span>
|
||
<span class="k">else</span> <span class="cm">/* comment */</span> <span class="err">↓</span><span class="p">{}</span>
|
||
</code></pre>
|
||
|
||
</div>
|
||
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|
||
|
||
|
||
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|
||
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|
||
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