Refactor and cleanup

packages/framework/src/Framework/Actions/Internal/FileFinder.php

@@ -43,14 +43,24 @@ public static function handle(string $directory, string|array|false $matchExtens
     /** @param array<string> $extensions */
     protected static function buildFileExtensionPattern(array $extensions): string
     {
-        // Normalize array by splitting any CSV strings within
-        $extensions = array_merge(...array_map(function (string $item): array {
-            return array_map(fn (string $item): string => trim($item), explode(',', $item));
+        $extensions = self::expandCommaSeparatedValues($extensions);
+
+        return '/\.(' . self::normalizeExtensionForRegexPattern($extensions) . ')$/i';
+    }
+
+    /** @param array<string> $extensions */
+    private static function expandCommaSeparatedValues(array $extensions): array
+    {
+        return array_merge(...array_map(function (string $item): array {
+            return array_map(fn(string $item): string => trim($item), explode(',', $item));
         }, $extensions));
+    }
 
-        // Remove leading dots, escape extensions, and build the regex pattern
-        return '/\.(' . implode('|', array_map(function (string $extension): string {
-                return preg_quote(ltrim($extension, '.'), '/');
-            }, $extensions)) . ')$/i';
+    /** @param array<string> $extensions */
+    private static function normalizeExtensionForRegexPattern(array $extensions): string
+    {
+        return implode('|', array_map(function (string $extension): string {
+            return preg_quote(ltrim($extension, '.'), '/');
+        }, $extensions));
     }
 }