X-Git-Url: https://git.heureux-cyclage.org/?a=blobdiff_plain;f=languages%2FLanguageCode.php;h=f50c55fe765d90de964ac630e2e06a5d90adcc4f;hb=49053c905a072e4b0e3a132854aad1d9cc274bb0;hp=3fa3dc16e527ae38114181cb68e58034857e972f;hpb=a8a5f03b3b6653136c4dc5925d6bb2b806010725;p=lhc%2Fweb%2Fwiklou.git

diff --git a/languages/LanguageCode.php b/languages/LanguageCode.php
index 3fa3dc16e5..f50c55fe76 100644
--- a/languages/LanguageCode.php
+++ b/languages/LanguageCode.php
@@ -80,4 +80,36 @@ class LanguageCode {
 		}
 		return $code;
 	}
+
+	/**
+	 * Get the normalised IETF language tag
+	 * See unit test for examples.
+	 * See mediawiki.language.bcp47 for the JavaScript implementation.
+	 *
+	 * @param string $code The language code.
+	 * @return string The language code which complying with BCP 47 standards.
+	 *
+	 * @since 1.31
+	 */
+	public static function bcp47( $code ) {
+		$codeSegment = explode( '-', $code );
+		$codeBCP = [];
+		foreach ( $codeSegment as $segNo => $seg ) {
+			// when previous segment is x, it is a private segment and should be lc
+			if ( $segNo > 0 && strtolower( $codeSegment[( $segNo - 1 )] ) == 'x' ) {
+				$codeBCP[$segNo] = strtolower( $seg );
+			// ISO 3166 country code
+			} elseif ( ( strlen( $seg ) == 2 ) && ( $segNo > 0 ) ) {
+				$codeBCP[$segNo] = strtoupper( $seg );
+			// ISO 15924 script code
+			} elseif ( ( strlen( $seg ) == 4 ) && ( $segNo > 0 ) ) {
+				$codeBCP[$segNo] = ucfirst( strtolower( $seg ) );
+			// Use lowercase for other cases
+			} else {
+				$codeBCP[$segNo] = strtolower( $seg );
+			}
+		}
+		$langCode = implode( '-', $codeBCP );
+		return $langCode;
+	}
 }