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diff --git a/www/wiki/includes/CommentStoreComment.php b/www/wiki/includes/CommentStoreComment.php
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+<?php
+/**
+ * Value object for CommentStore
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * CommentStoreComment represents a comment stored by CommentStore. The fields
+ * should be considered read-only.
+ * @since 1.30
+ */
+class CommentStoreComment {
+
+	/** @var int|null Comment ID, if any */
+	public $id;
+
+	/** @var string Text version of the comment */
+	public $text;
+
+	/** @var Message Message version of the comment. Might be a RawMessage */
+	public $message;
+
+	/** @var array|null Structured data of the comment */
+	public $data;
+
+	/**
+	 * @private For use by CommentStore only. Use self::newUnsavedComment() instead.
+	 * @param int|null $id
+	 * @param string $text
+	 * @param Message|null $message
+	 * @param array|null $data
+	 */
+	public function __construct( $id, $text, Message $message = null, array $data = null ) {
+		$this->id = $id;
+		$this->text = $text;
+		$this->message = $message ?: new RawMessage( '$1', [ $text ] );
+		$this->data = $data;
+	}
+
+	/**
+	 * Create a new, unsaved CommentStoreComment
+	 *
+	 * @param string|Message|CommentStoreComment $comment Comment text or Message object.
+	 *  A CommentStoreComment is also accepted here, in which case it is returned unchanged.
+	 * @param array|null $data Structured data to store. Keys beginning with '_' are reserved.
+	 *  Ignored if $comment is a CommentStoreComment.
+	 * @return CommentStoreComment
+	 */
+	public static function newUnsavedComment( $comment, array $data = null ) {
+		global $wgContLang;
+
+		if ( $comment instanceof CommentStoreComment ) {
+			return $comment;
+		}
+
+		if ( $data !== null ) {
+			foreach ( $data as $k => $v ) {
+				if ( substr( $k, 0, 1 ) === '_' ) {
+					throw new InvalidArgumentException( 'Keys in $data beginning with "_" are reserved' );
+				}
+			}
+		}
+
+		if ( $comment instanceof Message ) {
+			$message = clone $comment;
+			$text = $message->inLanguage( $wgContLang ) // Avoid $wgForceUIMsgAsContentMsg
+				->setInterfaceMessageFlag( true )
+				->text();
+			return new CommentStoreComment( null, $text, $message, $data );
+		} else {
+			return new CommentStoreComment( null, $comment, null, $data );
+		}
+	}
+}