Add locale_is_right_to_left polyfill

Author: alexander-schranz

src/Php85/Php85.php

@@ -13,6 +13,7 @@
 
 /**
  * @author Pierre Ambroise <[email protected]>
+ * @author Alexander Schranz <[email protected]>
  *
  * @internal
  */
@@ -33,4 +34,8 @@ public static function get_exception_handler(): ?callable
 
         return $handler;
     }
+
+    public static function locale_is_right_to_left(string $locale): bool {
+        return (bool) preg_match('/^(?:ar|he|fa|ur|ps|sd|ug|ckb|yi|dv|ku_arab|ku-arab)(?:[_-].*)?$/i', $locale);
+    }
 }

src/Php85/bootstrap.php

@@ -22,3 +22,7 @@ function get_error_handler(): ?callable { return p\Php85::get_error_handler(); }
 if (!function_exists('get_exception_handler')) {
     function get_exception_handler(): ?callable { return p\Php85::get_exception_handler(); }
 }
+
+if (!function_exists('locale_is_right_to_left')) {
+    function locale_is_right_to_left(string $locale): bool { return p\Php85::locale_is_right_to_left($locale); }
+}

tests/Php85/Php85Test.php

@@ -78,6 +78,25 @@ public static function provideHandler()
         $handler = new TestHandlerInvokable();
         yield [$handler, $handler];
     }
+
+    public function testLocaleIsRightToLeft(): void
+    {
+        $this->assertTrue(locale_is_right_to_left('ar'));
+        $this->assertTrue(locale_is_right_to_left('he'));
+        $this->assertTrue(locale_is_right_to_left('fa'));
+        $this->assertTrue(locale_is_right_to_left('ur'));
+        $this->assertTrue(locale_is_right_to_left('ps'));
+        $this->assertTrue(locale_is_right_to_left('sd'));
+        $this->assertTrue(locale_is_right_to_left('ug'));
+        $this->assertTrue(locale_is_right_to_left('ckb'));
+        $this->assertTrue(locale_is_right_to_left('yi'));
+        $this->assertTrue(locale_is_right_to_left('dv'));
+        $this->assertTrue(locale_is_right_to_left('ku_arab'));
+        $this->assertTrue(locale_is_right_to_left('ku-arab'));
+
+        $this->assertFalse(locale_is_right_to_left('en'));
+        $this->assertFalse(locale_is_right_to_left('fr'));
+    }
 }
 
 class TestHandler