[9.x] Fix infinite loop in blade compiler (#45780)

* Fix infinite loop in blade compiler

* Update BladeCompiler.php

Co-authored-by: Taylor Otwell <[email protected]>

Author: imanghafoori1

src/Illuminate/View/Compilers/BladeCompiler.php

@@ -521,7 +521,11 @@ protected function compileStatements($template)
             while (isset($match[4]) &&
                    Str::endsWith($match[0], ')') &&
                    ! $this->hasEvenNumberOfParentheses($match[0])) {
-                $rest = Str::before(Str::after($template, $match[0]), ')');
+                if (($after = Str::after($template, $match[0])) === $template) {
+                    break;
+                }
+
+                $rest = Str::before($after, ')');
 
                 if (isset($matches[0][$i + 1]) && Str::contains($rest.')', $matches[0][$i + 1])) {
                     unset($matches[0][$i + 1]);

tests/View/Blade/BladePhpStatementsTest.php

@@ -172,4 +172,10 @@ public function testNestedTagCalls()
         $expected = '<span class="<?php echo \Illuminate\Support\Arr::toCssClasses([\'k\' => @empty($v), \'t\' => @empty($v1), \'r\' => @empty($v2), \'l\' => \'l\']) ?>"></span><span class="<?php echo \Illuminate\Support\Arr::toCssClasses([\'k\' => @empty($v)]) ?>"></span>';
         $this->assertEquals($expected, $this->compiler->compileString($string));
     }
+
+    public function testItDoesNotCompileInvalidSyntax()
+    {
+        $template = "<a @class(['k\' => ()])></a>";
+        $this->assertEquals($template, $this->compiler->compileString($template));
+    }
 }