From 972a3306aee1ba40d8bd0caa3c9204a384135737 Mon Sep 17 00:00:00 2001
From: Nicolas Grekas <nicolas.grekas@gmail.com>
Date: Mon, 12 Feb 2018 16:55:55 +0100
Subject: [PATCH] [Intl] Add polyfill for Locale::canonicalize()

---
 src/Symfony/Component/Intl/Locale/Locale.php  | 37 ++++++++++++++++++-
 .../Intl/Tests/Locale/LocaleTest.php          | 11 ++++++
 .../Validator/Constraints/LocaleValidator.php |  3 +-
 src/Symfony/Component/Validator/composer.json |  3 +-
 4 files changed, 49 insertions(+), 5 deletions(-)

diff --git a/src/Symfony/Component/Intl/Locale/Locale.php b/src/Symfony/Component/Intl/Locale/Locale.php
index 2aa9eb7b090a..053f1db56ffd 100644
--- a/src/Symfony/Component/Intl/Locale/Locale.php
+++ b/src/Symfony/Component/Intl/Locale/Locale.php
@@ -16,8 +16,8 @@
 /**
  * Replacement for PHP's native {@link \Locale} class.
  *
- * The only method supported in this class is {@link getDefault}. This method
- * will always return "en". All other methods will throw an exception when used.
+ * The only methods supported in this class are `getDefault` and `canonicalize`.
+ * All other methods will throw an exception when used.
  *
  * @author Eriksen Costa <eriksen.costa@infranology.com.br>
  * @author Bernhard Schussek <bschussek@gmail.com>
@@ -57,6 +57,39 @@ public static function acceptFromHttp($header)
         throw new MethodNotImplementedException(__METHOD__);
     }
 
+    /**
+     * Returns a canonicalized locale string.
+     *
+     * This polyfill doesn't implement the full-spec algorithm. It only
+     * canonicalizes locale strings handled by the `LocaleBundle` class.
+     *
+     * @param string $locale
+     *
+     * @return string
+     */
+    public static function canonicalize($locale)
+    {
+        $locale = (string) $locale;
+
+        if ('' === $locale || '.' === $locale[0]) {
+            return self::getDefault();
+        }
+
+        if (!preg_match('/^([a-z]{2})[-_]([a-z]{2})(?:([a-z]{2})(?:[-_]([a-z]{2}))?)?(?:\..*)?$/i', $locale, $m)) {
+            return $locale;
+        }
+
+        if (!empty($m[4])) {
+            return strtolower($m[1]).'_'.ucfirst(strtolower($m[2].$m[3])).'_'.strtoupper($m[4]);
+        }
+
+        if (!empty($m[3])) {
+            return strtolower($m[1]).'_'.ucfirst(strtolower($m[2].$m[3]));
+        }
+
+        return strtolower($m[1]).'_'.strtoupper($m[2]);
+    }
+
     /**
      * Not supported. Returns a correctly ordered and delimited locale code.
      *
diff --git a/src/Symfony/Component/Intl/Tests/Locale/LocaleTest.php b/src/Symfony/Component/Intl/Tests/Locale/LocaleTest.php
index 5ee414a1c250..b0388620ba4b 100644
--- a/src/Symfony/Component/Intl/Tests/Locale/LocaleTest.php
+++ b/src/Symfony/Component/Intl/Tests/Locale/LocaleTest.php
@@ -21,6 +21,17 @@ public function testAcceptFromHttp()
         $this->call('acceptFromHttp', 'pt-br,en-us;q=0.7,en;q=0.5');
     }
 
+    public function testCanonicalize()
+    {
+        $this->assertSame('en', $this->call('canonicalize', ''));
+        $this->assertSame('en', $this->call('canonicalize', '.utf8'));
+        $this->assertSame('fr_FR', $this->call('canonicalize', 'FR-fr'));
+        $this->assertSame('fr_FR', $this->call('canonicalize', 'FR-fr.utf8'));
+        $this->assertSame('uz_Latn', $this->call('canonicalize', 'UZ-lATN'));
+        $this->assertSame('uz_Cyrl_UZ', $this->call('canonicalize', 'UZ-cYRL-uz'));
+        $this->assertSame('123', $this->call('canonicalize', 123));
+    }
+
     /**
      * @expectedException \Symfony\Component\Intl\Exception\MethodNotImplementedException
      */
diff --git a/src/Symfony/Component/Validator/Constraints/LocaleValidator.php b/src/Symfony/Component/Validator/Constraints/LocaleValidator.php
index 49783b6698e3..f3a3516a1151 100644
--- a/src/Symfony/Component/Validator/Constraints/LocaleValidator.php
+++ b/src/Symfony/Component/Validator/Constraints/LocaleValidator.php
@@ -12,7 +12,6 @@
 namespace Symfony\Component\Validator\Constraints;
 
 use Symfony\Component\Intl\Intl;
-use Symfony\Component\Intl\Locale as IntlLocale;
 use Symfony\Component\Validator\Constraint;
 use Symfony\Component\Validator\ConstraintValidator;
 use Symfony\Component\Validator\Exception\UnexpectedTypeException;
@@ -43,7 +42,7 @@ public function validate($value, Constraint $constraint)
 
         $value = (string) $value;
         if ($constraint->canonicalize) {
-            $value = IntlLocale::canonicalize($value);
+            $value = \Locale::canonicalize($value);
         }
         $localeBundle = Intl::getLocaleBundle();
         $locales = $localeBundle->getLocaleNames();
diff --git a/src/Symfony/Component/Validator/composer.json b/src/Symfony/Component/Validator/composer.json
index 2e44519c2776..7e7ce9df17ed 100644
--- a/src/Symfony/Component/Validator/composer.json
+++ b/src/Symfony/Component/Validator/composer.json
@@ -24,7 +24,7 @@
         "symfony/http-foundation": "~4.1",
         "symfony/http-kernel": "~3.4|~4.0",
         "symfony/var-dumper": "~3.4|~4.0",
-        "symfony/intl": "~3.4|~4.0",
+        "symfony/intl": "~4.1",
         "symfony/yaml": "~3.4|~4.0",
         "symfony/config": "~3.4|~4.0",
         "symfony/dependency-injection": "~3.4|~4.0",
@@ -39,6 +39,7 @@
         "phpunit/phpunit": "<4.8.35|<5.4.3,>=5.0",
         "symfony/dependency-injection": "<3.4",
         "symfony/http-kernel": "<3.4",
+        "symfony/intl": "<4.1",
         "symfony/yaml": "<3.4"
     },
     "suggest": {