From 0e08362b40164aafb3b30b43a65a584430d17d37 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Niklas=20Laxstr=C3=B6m?= <niklas.laxstrom@gmail.com>
Date: Mon, 14 Jan 2013 07:21:10 +0000
Subject: [PATCH] (bug 41477) Add Language::isSupportedLanguage

Change-Id: If48c23fd580133bf78c19d4a0e8e00e74a639fa1
---
 languages/Language.php                   | 12 ++++++++++++
 tests/phpunit/languages/LanguageTest.php | 16 ++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/languages/Language.php b/languages/Language.php
index 0a1cd37d97..7a62112635 100644
--- a/languages/Language.php
+++ b/languages/Language.php
@@ -245,6 +245,18 @@ class Language {
 		throw new MWException( "Invalid fallback sequence for language '$code'" );
 	}
 
+	/**
+	 * Checks whether any localisation is available for that language tag
+	 * in MediaWiki (MessagesXx.php exists).
+	 *
+	 * @param string $code Language tag (in lower case)
+	 * @return bool Whether language is supported
+	 * @since 1.21
+	 */
+	public static function isSupportedLanguage( $code ) {
+		return is_readable( self::getMessagesFileName( $code ) );
+	}
+
 	/**
 	 * Returns true if a language code string is of a valid form, whether or
 	 * not it exists. This includes codes which are used solely for
diff --git a/tests/phpunit/languages/LanguageTest.php b/tests/phpunit/languages/LanguageTest.php
index 785c21c91e..5d32ff4ac2 100644
--- a/tests/phpunit/languages/LanguageTest.php
+++ b/tests/phpunit/languages/LanguageTest.php
@@ -1155,5 +1155,21 @@ class LanguageTest extends LanguageClassesTestCase {
 		$this->assertEquals( "a{$c}b{$and}{$s}c", $lang->listToText( array( 'a', 'b', 'c' ) ) );
 		$this->assertEquals( "a{$c}b{$c}c{$and}{$s}d", $lang->listToText( array( 'a', 'b', 'c', 'd' ) ) );
 	}
+
+	/**
+	 * @dataProvider provideIsSupportedLanguage
+	 */
+	function testIsSupportedLanguage( $code, $expected, $comment ) {
+		$this->assertEquals( $expected, Language::isSupportedLanguage( $code ), $comment );
+	}
+
+	static function provideIsSupportedLanguage() {
+		return array(
+			array( 'en', true, 'is supported language' ),
+			array( 'fi', true, 'is supported language' ),
+			array( 'bunny', false, 'is not supported language' ),
+			array( 'FI', false, 'is not supported language, input should be in lower case' ),
+		);
+	}
 }
 
-- 
2.20.1