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diff --git a/www/wiki/extensions/Translate/Message.php b/www/wiki/extensions/Translate/Message.php
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+<?php
+/**
+ * Classes for message objects TMessage and ThinMessage.
+ *
+ * @file
+ * @author Niklas Laxström
+ * @copyright Copyright © 2008-2010, Niklas Laxström
+ * @license GPL-2.0-or-later
+ */
+
+/**
+ * Interface for message objects used by MessageCollection.
+ */
+abstract class TMessage {
+	/** @var string Message display key. */
+	protected $key;
+	/** @var string Message definition. */
+	protected $definition;
+	/** @var string Committed in-file translation. */
+	protected $infile;
+	/** @var string[] Message tags. */
+	protected $tags = [];
+	/** @var array Message properties. */
+	protected $props = [];
+	/** @var string[] Message reviewers. */
+	protected $reviewers = [];
+
+	/**
+	 * Creates new message object.
+	 *
+	 * @param string $key Unique key identifying this message.
+	 * @param string $definition The authoritave definition of this message.
+	 */
+	public function __construct( $key, $definition ) {
+		$this->key = $key;
+		$this->definition = $definition;
+	}
+
+	/**
+	 * Get the message key.
+	 * @return string
+	 */
+	public function key() {
+		return $this->key;
+	}
+
+	/**
+	 * Get the message definition.
+	 * @return string
+	 */
+	public function definition() {
+		return $this->definition;
+	}
+
+	/**
+	 * Get the message translation.
+	 * @return string|null
+	 */
+	abstract public function translation();
+
+	/**
+	 * Set the committed translation.
+	 * @param string $text
+	 */
+	public function setInfile( $text ) {
+		$this->infile = $text;
+	}
+
+	/**
+	 * Returns the committed translation.
+	 * @return string|null
+	 */
+	public function infile() {
+		return $this->infile;
+	}
+
+	/**
+	 * Add a tag for this message.
+	 * @param string $tag
+	 */
+	public function addTag( $tag ) {
+		$this->tags[] = $tag;
+	}
+
+	/**
+	 * Check if this message has a given tag.
+	 * @param string $tag
+	 * @return bool
+	 */
+	public function hasTag( $tag ) {
+		return in_array( $tag, $this->tags, true );
+	}
+
+	/**
+	 * Return all tags for this message;
+	 * @return array of strings
+	 */
+	public function getTags() {
+		return $this->tags;
+	}
+
+	public function setProperty( $key, $value ) {
+		$this->props[$key] = $value;
+	}
+
+	public function appendProperty( $key, $value ) {
+		if ( !isset( $this->props[$key] ) ) {
+			$this->props[$key] = [];
+		}
+		$this->props[$key][] = $value;
+	}
+
+	public function getProperty( $key ) {
+		return $this->props[$key] ?? null;
+	}
+
+	/**
+	 * Get all the available property names.
+	 * @return array
+	 * @since 2013-01-17
+	 */
+	public function getPropertyNames() {
+		return array_keys( $this->props );
+	}
+}
+
+/**
+ * %Message object which is based on database result row. Hence the name thin.
+ * Needs fields rev_user_text and those that are needed for loading revision
+ * text.
+ */
+class ThinMessage extends TMessage {
+	// This maps properties to fields in the database result row
+	protected static $propertyMap = [
+		'last-translator-text' => 'rev_user_text',
+		'last-translator-id' => 'rev_user',
+	];
+
+	/**
+	 * @var stdClass Database Result Row
+	 */
+	protected $row;
+
+	/**
+	 * Set the database row this message is based on.
+	 * @param array $row Database Result Row
+	 */
+	public function setRow( $row ) {
+		$this->row = $row;
+	}
+
+	public function translation() {
+		if ( !isset( $this->row ) ) {
+			return $this->infile();
+		}
+
+		return Revision::getRevisionText( $this->row );
+	}
+
+	// Re-implemented
+	public function getProperty( $key ) {
+		if ( !isset( self::$propertyMap[$key] ) ) {
+			return parent::getProperty( $key );
+		}
+
+		$field = self::$propertyMap[$key];
+		if ( !isset( $this->row->$field ) ) {
+			return null;
+		}
+
+		return $this->row->$field;
+	}
+
+	// Re-implemented
+	public function getPropertyNames() {
+		return array_merge( parent::getPropertyNames(), array_keys( self::$propertyMap ) );
+	}
+}
+
+/**
+ * %Message object where you can directly set the translation.
+ * Hence the name fat. Authors are not supported.
+ */
+class FatMessage extends TMessage {
+	/** @var string Stored translation. */
+	protected $translation;
+
+	/**
+	 * Set the current translation of this message.
+	 * @param string $text
+	 */
+	public function setTranslation( $text ) {
+		$this->translation = $text;
+	}
+
+	public function translation() {
+		if ( $this->translation === null ) {
+			return $this->infile;
+		}
+
+		return $this->translation;
+	}
+}