1 files changed, 63 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/DataValues/LanguageCodeValue.php b/www/wiki/extensions/SemanticMediaWiki/src/DataValues/LanguageCodeValue.php
new file mode 100644
index 00000000..f6bef8d8
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/DataValues/LanguageCodeValue.php
@@ -0,0 +1,63 @@
+<?php
+
+namespace SMW\DataValues;
+
+use SMW\Localizer;
+use SMWDIBlob as DIBlob;
+
+/**
+ * Handles a string value to adhere the BCP47 normative content declaration for
+ * a language code tag
+ *
+ * @see https://en.wikipedia.org/wiki/IETF_language_tag
+ *
+ * @license GNU GPL v2+
+ * @since 2.4
+ *
+ * @author mwjames
+ */
+class LanguageCodeValue extends StringValue {
+
+	/**
+	 * DV identifier
+	 */
+	const TYPE_ID = '__lcode';
+
+	/**
+	 * @param string $typeid
+	 */
+	public function __construct( $typeid = '' ) {
+		parent::__construct( self::TYPE_ID );
+	}
+
+	/**
+	 * @see DataValue::parseUserValue
+	 *
+	 * @param string $value
+	 */
+	protected function parseUserValue( $userValue ) {
+
+		$languageCode = Localizer::asBCP47FormattedLanguageCode( $userValue );
+
+		if ( $languageCode === '' ) {
+			$this->addErrorMsg( [
+				'smw-datavalue-languagecode-missing',
+				$this->m_property !== null ? $this->m_property->getLabel() : 'UNKNOWN'
+			] );
+			return;
+		}
+
+		// Checks whether the language tag is valid in MediaWiki for when
+		// it is not executed in a query context
+		if ( !$this->getOption( self::OPT_QUERY_CONTEXT ) && !Localizer::isKnownLanguageTag( $languageCode ) ) {
+			$this->addErrorMsg( [
+				'smw-datavalue-languagecode-invalid',
+				$languageCode
+			] );
+			return;
+		}
+
+		$this->m_dataitem = new DIBlob( $languageCode );
+	}
+
+}