Add blade directive @guest (#20114)

* Update CompilesConditionals.php

* Add Test

* Fix Style CI

* Fix Style CI #2

Author: Lukas Kämmerling

src/Illuminate/View/Compilers/Concerns/CompilesConditionals.php

@@ -119,4 +119,25 @@ protected function compileEndAuth()
     {
         return '<?php endif; ?>';
     }
+ 
+    /**
+     * Compile the if-guest statements into valid PHP.
+     *
+     * @param  string|null  $guard
+     * @return string
+     */
+    protected function compileGuest($guard = null)
+    {
+        return "<?php if(auth()->guard{$guard}->guest()): ?>";
+    }
+
+    /**
+     * Compile the end-guest statements into valid PHP.
+     *
+     * @return string
+     */
+    protected function compileEndGuest()
+    {
+        return '<?php endif; ?>';
+    }
 }

tests/View/Blade/BladeIfGuestStatementsTest.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace Illuminate\Tests\Blade;
+
+use Mockery as m;
+use PHPUnit\Framework\TestCase;
+use Illuminate\View\Compilers\BladeCompiler;
+
+class BladeIfGuestStatementsTest extends TestCase
+{
+    public function tearDown()
+    {
+        m::close();
+    }
+
+    public function testIfStatementsAreCompiled()
+    {
+        $compiler = new BladeCompiler($this->getFiles(), __DIR__);
+        $string = '@guest("api")
+breeze
+@endguest';
+        $expected = '<?php if(auth()->guard("api")->guest()): ?>
+breeze
+<?php endif; ?>';
+        $this->assertEquals($expected, $compiler->compileString($string));
+    }
+
+    protected function getFiles()
+    {
+        return m::mock('Illuminate\Filesystem\Filesystem');
+    }
+}