[5.x] Extract text direction for reuse (#9730)

Co-authored-by: Jason Varga <[email protected]>

src/Statamic.php

@@ -15,6 +15,7 @@
 use Statamic\Support\Arr;
 use Statamic\Support\DateFormat;
 use Statamic\Support\Str;
+use Statamic\Support\TextDirection;
 use Statamic\Tags\FluentTag;
 use Stringy\StaticStringy;
 
@@ -479,8 +480,6 @@ public static function cpLocale(): string
 
     public static function cpDirection()
     {
-        $rtl = ['ar', 'fa', 'he', 'ps', 'ur'];
-
-        return in_array(static::cpLocale(), $rtl) ? 'rtl' : 'ltr';
+        return TextDirection::of(static::cpLocale());
     }
 }

src/Support/TextDirection.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace Statamic\Support;
+
+class TextDirection
+{
+    private const RTL = ['ar', 'fa', 'he', 'ps', 'ur'];
+
+    public static function of(string $lang): string
+    {
+        return in_array($lang, static::RTL) ? 'rtl' : 'ltr';
+    }
+}