From 67f5c8de2647a2685566eda3425820db6010331f Mon Sep 17 00:00:00 2001
From: Zhineng Li <im@zhineng.li>
Date: Wed, 21 Jan 2026 15:41:45 +0800
Subject: improve readability

---
 src/Build/TopLevelHandler.php | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

(limited to 'src/Build')

diff --git a/src/Build/TopLevelHandler.php b/src/Build/TopLevelHandler.php
index 273b702..edb500d 100644
--- a/src/Build/TopLevelHandler.php
+++ b/src/Build/TopLevelHandler.php
@@ -9,19 +9,26 @@ use Symfony\Component\VarExporter\VarExporter;
 final class TopLevelHandler implements RegionHandler
 {
     /**
+     * A list of top-level region codes.
+     *
      * @var int[]
      */
     private array $data = [];
 
     public function handle(string $code, string $name): void
     {
-        if (substr($code, -4) !== '0000') {
+        if (! $this->isProvince($code)) {
             return;
         }
 
         $this->data[] = (int) $code;
     }
 
+    private function isProvince(string $code): bool
+    {
+        return substr($code, -4) === '0000';
+    }
+
     public function export(string $destination): void
     {
         $exported = VarExporter::export($this->data);
-- 
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