[10.x] Improved Handling of Empty Component Slots with HTML Comments or Line Breaks

src/Illuminate/View/ComponentSlot.php

@@ -3,6 +3,7 @@
 namespace Illuminate\View;
 
 use Illuminate\Contracts\Support\Htmlable;
+use InvalidArgumentException;
 
 class ComponentSlot implements Htmlable
 {
@@ -77,6 +78,25 @@ public function isNotEmpty()
         return ! $this->isEmpty();
     }
 
+    /**
+     * Determine if the slot has non-comment content.
+     *
+     * @param  callable|string|null  $callable
+     * @return bool
+     */
+    public function hasActualContent(callable|string|null $callable = null)
+    {
+        if (is_string($callable) && ! function_exists($callable)) {
+            throw new InvalidArgumentException('Callable does not exist.');
+        }
+
+        return filter_var(
+            $this->contents,
+            FILTER_CALLBACK,
+            ['options' => $callable ?? fn ($input) => trim(preg_replace("/<!--([\s\S]*?)-->/", '', $input))]
+        ) !== '';
+    }
+
     /**
      * Get the slot's HTML string.
      *

tests/View/ComponentTest.php

@@ -11,6 +11,7 @@
 use Illuminate\Support\Facades\Facade;
 use Illuminate\Support\HtmlString;
 use Illuminate\View\Component;
+use Illuminate\View\ComponentSlot;
 use Illuminate\View\Factory;
 use Illuminate\View\View;
 use Mockery as m;
@@ -305,6 +306,63 @@ public function testFactoryGetsSharedBetweenComponents()
         Component::forgetFactory();
         $this->assertNotSame($this->viewFactory, $getFactory($inline));
     }
+
+    public function testComponentSlotIsEmpty()
+    {
+        $slot = new ComponentSlot();
+
+        $this->assertTrue((bool) $slot->isEmpty());
+    }
+
+    public function testComponentSlotSanitizedEmpty()
+    {
+        // default sanitizer should remove all html tags
+        $slot = new ComponentSlot('<!-- test -->');
+
+        $linebreakingSlot = new ComponentSlot("\n  \t");
+
+        $moreComplexSlot = new ComponentSlot('<!--
+        <p>commented HTML</p>
+        <img border="0" src="" alt="">
+        -->');
+
+        $this->assertFalse((bool) $slot->hasActualContent());
+        $this->assertFalse((bool) $linebreakingSlot->hasActualContent('trim'));
+        $this->assertFalse((bool) $moreComplexSlot->hasActualContent());
+    }
+
+    public function testComponentSlotSanitizedNotEmpty()
+    {
+        // default sanitizer should remove all html tags
+        $slot = new ComponentSlot('<!-- test -->not empty');
+
+        $linebreakingSlot = new ComponentSlot("\ntest  \t");
+
+        $moreComplexSlot = new ComponentSlot('before<!--
+        <p>commented HTML</p>
+        <img border="0" src="" alt="">
+        -->after');
+
+        $this->assertTrue((bool) $slot->hasActualContent());
+        $this->assertTrue((bool) $linebreakingSlot->hasActualContent('trim'));
+        $this->assertTrue((bool) $moreComplexSlot->hasActualContent());
+    }
+
+    public function testComponentSlotIsNotEmpty()
+    {
+        $slot = new ComponentSlot('test');
+
+        $anotherSlot = new ComponentSlot('test<!-- test -->');
+
+        $moreComplexSlot = new ComponentSlot('t<!--
+        <p>Look at this cool image:</p>
+        <img border="0" src="pic_trulli.jpg" alt="Trulli">
+        -->est');
+
+        $this->assertTrue((bool) $slot->hasActualContent());
+        $this->assertTrue((bool) $anotherSlot->hasActualContent());
+        $this->assertTrue((bool) $moreComplexSlot->hasActualContent());
+    }
 }
 
 class TestInlineViewComponent extends Component