1 files changed, 100 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/Lang/FallbackFinder.php b/www/wiki/extensions/SemanticMediaWiki/src/Lang/FallbackFinder.php
new file mode 100644
index 00000000..4931ebb7
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/Lang/FallbackFinder.php
@@ -0,0 +1,100 @@
+<?php
+
+namespace SMW\Lang;
+
+use RuntimeException;
+
+/**
+ * @license GNU GPL v2+
+ * @since 2.5
+ *
+ * @author mwjames
+ */
+class FallbackFinder {
+
+	/**
+	 * @var JsonContentsFileReader
+	 */
+	private $jsonContentsFileReader;
+
+	/**
+	 * @var string
+	 */
+	private $canonicalFallbackLanguageCode = 'en';
+
+	/**
+	 * @var array
+	 */
+	private $fallbackLanguages = [];
+
+	/**
+	 * @since 2.5
+	 *
+	 * @param JsonContentsFileReader $jsonContentsFileReader
+	 */
+	public function __construct( JsonContentsFileReader $jsonContentsFileReader ) {
+		$this->jsonContentsFileReader = $jsonContentsFileReader;
+	}
+
+	/**
+	 * @since 2.5
+	 */
+	public function emptyByLanguageCode( $languageCode ) {
+		unset( $this->fallbackLanguages[strtolower( trim( $languageCode ) )] );
+	}
+
+	/**
+	 * @since 2.5
+	 *
+	 * @return string
+	 */
+	public function getCanonicalFallbackLanguageCode() {
+		return $this->canonicalFallbackLanguageCode;
+	}
+
+	/**
+	 * @since 2.5
+	 *
+	 * @param string $languageCode
+	 *
+	 * @return string
+	 */
+	public function getFallbackLanguageBy( $languageCode = '' ) {
+
+		$languageCode = strtolower( trim( $languageCode ) );
+
+		if ( isset( $this->fallbackLanguages[$languageCode] ) ) {
+			return $this->fallbackLanguages[$languageCode];
+		}
+
+		$index = 'fallback_language';
+
+		// Unknown, use the default
+		if ( $languageCode === '' ) {
+			return $this->canonicalFallbackLanguageCode;
+		}
+
+		try {
+			$contents = $this->jsonContentsFileReader->readByLanguageCode( $languageCode );
+		} catch ( RuntimeException $e ) {
+			$this->fallbackLanguages[$languageCode] = $this->canonicalFallbackLanguageCode;
+		}
+
+		// Get customized fallbackLanguage
+		if ( isset( $contents[$index] ) ) {
+			$this->fallbackLanguages[$languageCode] = $contents[$index];
+		}
+
+		// The ultimate defense line, fallback was not set, or is false or empty
+		// which means use the canonicalFallbackLanguageCode
+		if (
+			!isset( $contents[$index] ) ||
+			$this->fallbackLanguages[$languageCode] === false ||
+			$this->fallbackLanguages[$languageCode] === '' ) {
+			$this->fallbackLanguages[$languageCode] = $this->canonicalFallbackLanguageCode;
+		}
+
+		return $this->fallbackLanguages[$languageCode];
+	}
+
+}