Correctly replace all PHP placeholders with the parameters

Signed-off-by: Joas Schilling <coding@schilljs.com>

lib/private/L10N/L10NString.php

@@ -61,10 +61,6 @@ class L10NString implements \JsonSerializable {
 		$translations = $this->l10n->getTranslations();
 		$identityTranslator = $this->l10n->getIdentityTranslator();
 
-		$parameters = $this->parameters;
-		// Add $count as %count% as per \Symfony\Contracts\Translation\TranslatorInterface
-		$parameters['%count%'] = $this->count;
-
 		// Use the indexed version as per \Symfony\Contracts\Translation\TranslatorInterface
 		$identity = $this->text;
 		if (array_key_exists($this->text, $translations)) {
@@ -84,7 +80,10 @@ class L10NString implements \JsonSerializable {
 
 		$identity = str_replace('%n', '%count%', $identity);
 
-		return $identityTranslator->trans($identity, $parameters);
+		// $count as %count% as per \Symfony\Contracts\Translation\TranslatorInterface
+		$text = $identityTranslator->trans($identity, ['%count%' => $this->count]);
+
+		return vsprintf($text, $this->parameters);
 	}
 
 

tests/data/l10n/de.json

@@ -1,6 +1,9 @@
 {
 	"translations" : {
-		"_%n file_::_%n files_": ["%n Datei", "%n Dateien"]
+		"_%n file_::_%n files_": ["%n Datei", "%n Dateien"],
+		"Ordered placeholders one %s two %s": "Placeholder one %s two %s",
+		"Reordered placeholders one %s two %s": "Placeholder two %2$s one %1$s",
+		"Reordered placeholders one %1$s two %2$s": "Placeholder two %2$s one %1$s"
 	},
 	"pluralForm" :	"nplurals=2; plural=(n != 1);"
 }

tests/lib/L10N/L10nTest.php

@@ -76,6 +76,27 @@ class L10nTest extends TestCase {
 		$this->assertEquals('5 oken', (string)$l->n('%n window', '%n windows', 5));
 	}
 
+	public function dataPlaceholders(): array {
+		return [
+			['Ordered placeholders one %s two %s', 'Placeholder one 1 two 2'],
+			['Reordered placeholders one %s two %s', 'Placeholder two 2 one 1'],
+			['Reordered placeholders one %1$s two %2$s', 'Placeholder two 2 one 1'],
+		];
+	}
+
+	/**
+	 * @dataProvider dataPlaceholders
+	 *
+	 * @param $string
+	 * @param $expected
+	 */
+	public function testPlaceholders($string, $expected): void {
+		$transFile = \OC::$SERVERROOT.'/tests/data/l10n/de.json';
+		$l = new L10N($this->getFactory(), 'test', 'de', 'de_AT', [$transFile]);
+
+		$this->assertEquals($expected, $l->t($string, ['1', '2']));
+	}
+
 	public function localizationData() {
 		return [
 			// timestamp as string