1 files changed, 172 insertions, 0 deletions
diff --git a/www/wiki/extensions/SemanticMediaWiki/src/Lang/LanguageContents.php b/www/wiki/extensions/SemanticMediaWiki/src/Lang/LanguageContents.php
new file mode 100644
index 00000000..be3d4b3d
--- /dev/null
+++ b/www/wiki/extensions/SemanticMediaWiki/src/Lang/LanguageContents.php
@@ -0,0 +1,172 @@
+<?php
+
+namespace SMW\Lang;
+
+use RuntimeException;
+
+/**
+ * @license GNU GPL v2+
+ * @since 2.5
+ *
+ * @author mwjames
+ */
+class LanguageContents {
+
+	/**
+	 * @var JsonContentsFileReader
+	 */
+	private $jsonContentsFileReader;
+
+	/**
+	 * @var FallbackFinder
+	 */
+	private $fallbackFinder;
+
+	/**
+	 * @var array
+	 */
+	private $contents = [];
+
+	/**
+	 * @since 2.5
+	 *
+	 * @param JsonContentsFileReader $jsonContentsFileReader
+	 * @param FallbackFinder $fallbackFinder
+	 */
+	public function __construct( JsonContentsFileReader $jsonContentsFileReader, FallbackFinder $fallbackFinder ) {
+		$this->jsonContentsFileReader = $jsonContentsFileReader;
+		$this->fallbackFinder = $fallbackFinder;
+	}
+
+	/**
+	 * @since 2.5
+	 *
+	 * @return string
+	 */
+	public function getCanonicalFallbackLanguageCode() {
+		return $this->fallbackFinder->getCanonicalFallbackLanguageCode();
+	}
+
+	/**
+	 * @since 2.5
+	 *
+	 * @param string $languageCode
+	 *
+	 * @return boolean
+	 */
+	public function isLoaded( $languageCode ) {
+		return isset( $this->contents[$languageCode] ) || array_key_exists( $languageCode, $this->contents );
+	}
+
+	/**
+	 * @since 2.5
+	 *
+	 * @param string $languageCode
+	 *
+	 * @return boolean
+	 */
+	public function load( $languageCode ) {
+
+		if ( !$this->isLoaded( $languageCode ) && !$this->jsonContentsFileReader->canReadByLanguageCode( $languageCode ) ) {
+			$languageCode = $this->fallbackFinder->getFallbackLanguageBy( $languageCode );
+		}
+
+		if ( !$this->isLoaded( $languageCode ) ) {
+			$this->contents[$languageCode] = $this->jsonContentsFileReader->readByLanguageCode( $languageCode );
+		}
+	}
+
+	/**
+	 * @since 2.5
+	 *
+	 * @param string $id
+	 * @param string $languageCode
+	 *
+	 * @return array|string|false
+	 */
+	public function get( $id, $languageCode ) {
+		return $this->matchLanguage( $languageCode, $id );
+	}
+
+	private function matchLanguage( $languageCode, $id ) {
+
+		$canonicalFallbackLanguageCode = $this->fallbackFinder->getCanonicalFallbackLanguageCode();
+
+		if ( !isset( $this->contents[$languageCode] ) || $this->contents[$languageCode] === [] ) {
+			// In case a language has no matching file
+			try {
+				$this->contents[$languageCode] = $this->jsonContentsFileReader->readByLanguageCode( $languageCode );
+			} catch ( RuntimeException $e ) {
+				$this->contents[$languageCode] = [];
+				$languageCode = $canonicalFallbackLanguageCode;
+			}
+		}
+
+		$depth = 1;
+
+		// There is certainly a better (meaning generic) way to do this yet with
+		// only a limited depth, doing a recursive traversal will not yield an
+		// advantage
+		if ( strpos( $id, '.' ) !== false ) {
+			$keys = explode( '.', $id );
+			$depth = count( $keys );
+		}
+
+		if ( $depth == 1 && isset( $this->contents[$languageCode][$id] ) && $this->contents[$languageCode][$id] !== [] ) {
+			return $this->contents[$languageCode][$id];
+		}
+
+		if ( $depth == 2 && isset( $this->contents[$languageCode][$keys[0]][$keys[1]] ) && $this->contents[$languageCode][$keys[0]][$keys[1]] !== [] ) {
+			return $this->contents[$languageCode][$keys[0]][$keys[1]];
+		}
+
+		if ( $depth == 3 && isset( $this->contents[$languageCode][$keys[0]][$keys[1]][$keys[2]] ) && $this->contents[$languageCode][$keys[0]][$keys[1]][$keys[2]] !== [] ) {
+			return $this->contents[$languageCode][$keys[0]][$keys[1]][$keys[2]];
+		}
+
+		if ( $languageCode !== $canonicalFallbackLanguageCode ) {
+			return $this->matchLanguage( $this->fallbackFinder->getFallbackLanguageBy( $languageCode ), $id );
+		}
+
+		return $this->matchCanonicalLanguage( $canonicalFallbackLanguageCode, $id );
+	}
+
+	private function matchCanonicalLanguage( $languageCode, $id ) {
+
+		$depth = 1;
+
+		if ( strpos( $id, '.' ) !== false ) {
+			$keys = explode( '.', $id );
+			$depth = count( $keys );
+		}
+
+		// Last resort before throwing the towel, make sure we really have
+		// something when the default FallbackLanguageCode is used
+		if ( $depth == 1 && !isset( $this->contents[$languageCode][$id] ) ) {
+			$this->contents[$languageCode] = $this->jsonContentsFileReader->readByLanguageCode( $languageCode, true );
+		}
+
+		if ( $depth == 1 && isset( $this->contents[$languageCode][$id] ) ) {
+			return $this->contents[$languageCode][$id];
+		}
+
+		if ( $depth == 2 && !isset( $this->contents[$languageCode][$keys[0]][$keys[1]] ) ) {
+			$this->contents[$languageCode] = $this->jsonContentsFileReader->readByLanguageCode( $languageCode, true );
+		}
+
+		if ( $depth == 2 && isset( $this->contents[$languageCode][$keys[0]][$keys[1]] ) ) {
+			return $this->contents[$languageCode][$keys[0]][$keys[1]];
+		}
+
+		if ( $depth == 3 && !isset( $this->contents[$languageCode][$keys[0]][$keys[1]][$keys[2]] ) ) {
+			$this->contents[$languageCode] = $this->jsonContentsFileReader->readByLanguageCode( $languageCode, true );
+		}
+
+		if ( $depth == 3 && isset( $this->contents[$languageCode][$keys[0]][$keys[1]][$keys[2]] ) ) {
+			return $this->contents[$languageCode][$keys[0]][$keys[1]][$keys[2]];
+		}
+
+		throw new RuntimeException( "Unknown or invalid `{$id}` id for `{$languageCode}`"  );
+	}
+
+}