Support customized intl php.ini settings

`IntlDateParser->parse()` behaves differently when `intl.error_level` and/or `intl.use_exceptions` are not 0.

This change makes sure `\IntlException` is caught when `intl.use_exceptions` is 1 and warnings thrown when `intl.error_level` is not 0 are ignored.

src/Symfony/Component/Form/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformer.php

@@ -117,8 +117,13 @@ public function reverseTransform($value)
         // date-only patterns require parsing to be done in UTC, as midnight might not exist in the local timezone due
         // to DST changes
         $dateOnly = $this->isPatternDateOnly();
+        $dateFormatter = $this->getIntlDateFormatter($dateOnly);
 
-        $timestamp = $this->getIntlDateFormatter($dateOnly)->parse($value);
+        try {
+            $timestamp = @$dateFormatter->parse($value);
+        } catch (\IntlException $ex) {
+            throw new TransformationFailedException($ex->getMessage(), $ex->getCode(), $ex);
+        }
 
         if (0 != intl_get_error_code()) {
             throw new TransformationFailedException(intl_get_error_message());

src/Symfony/Component/Form/Tests/Extension/Core/DataTransformer/DateTimeToLocalizedStringTransformerTest.php

@@ -27,6 +27,12 @@ protected function setUp(): void
     {
         parent::setUp();
 
+        // Normalize intl. configuration settings.
+        if (\extension_loaded('intl')) {
+            $this->iniSet('intl.use_exceptions', 0);
+            $this->iniSet('intl.error_level', 0);
+        }
+
         // Since we test against "de_AT", we need the full implementation
         IntlTestHelper::requireFullIntl($this, '57.1');
 
@@ -322,4 +328,44 @@ public function testReverseTransformFiveDigitYearsWithTimestamp()
         $transformer = new DateTimeToLocalizedStringTransformer('UTC', 'UTC', null, null, \IntlDateFormatter::GREGORIAN, 'yyyy-MM-dd HH:mm:ss');
         $transformer->reverseTransform('20107-03-21 12:34:56');
     }
+
+    public function testReverseTransformWrapsIntlErrorsWithErrorLevel()
+    {
+        if (!\extension_loaded('intl')) {
+            $this->markTestSkipped('intl extension is not loaded');
+        }
+
+        $this->iniSet('intl.error_level', E_WARNING);
+
+        $this->expectException('Symfony\Component\Form\Exception\TransformationFailedException');
+        $transformer = new DateTimeToLocalizedStringTransformer();
+        $transformer->reverseTransform('12345');
+    }
+
+    public function testReverseTransformWrapsIntlErrorsWithExceptions()
+    {
+        if (!\extension_loaded('intl')) {
+            $this->markTestSkipped('intl extension is not loaded');
+        }
+
+        $this->iniSet('intl.use_exceptions', 1);
+
+        $this->expectException('Symfony\Component\Form\Exception\TransformationFailedException');
+        $transformer = new DateTimeToLocalizedStringTransformer();
+        $transformer->reverseTransform('12345');
+    }
+
+    public function testReverseTransformWrapsIntlErrorsWithExceptionsAndErrorLevel()
+    {
+        if (!\extension_loaded('intl')) {
+            $this->markTestSkipped('intl extension is not loaded');
+        }
+
+        $this->iniSet('intl.use_exceptions', 1);
+        $this->iniSet('intl.error_level', E_WARNING);
+
+        $this->expectException('Symfony\Component\Form\Exception\TransformationFailedException');
+        $transformer = new DateTimeToLocalizedStringTransformer();
+        $transformer->reverseTransform('12345');
+    }
 }