Add getters to Message object.

Being able to get the message key and parameters from a Message object
is needed to be able to report errors from the API in an abstract,
language neutral way.

Change-Id: I8ee9da4005db7cb0a487457127f1e24fb11dbd66

includes/Message.php

@@ -226,6 +226,39 @@ class Message {
 		$this->language = $wgLang;
 	}
 
+	/**
+	 * Returns the message key
+	 *
+	 * @since 1.21
+	 *
+	 * @return string
+	 */
+	public function getKey() {
+		return $this->key;
+	}
+
+	/**
+	 * Returns the message parameters
+	 *
+	 * @since 1.21
+	 *
+	 * @return string[]
+	 */
+	public function getParams() {
+		return $this->parameters;
+	}
+
+	/**
+	 * Returns the message format
+	 *
+	 * @since 1.21
+	 *
+	 * @return string
+	 */
+	public function getFormat() {
+		return $this->format;
+	}
+
 	/**
 	 * Factory function that is just wrapper for the real constructor. It is
 	 * intented to be used instead of the real constructor, because it allows

includes/Status.php

@@ -231,6 +231,10 @@ class Status {
 	/**
 	 * Get the error message as HTML. This is done by parsing the wikitext error
 	 * message.
+	 *
+	 * @note: this does not perform a full wikitext to HTML conversion, it merely applies
+	 *        a message transformation.
+	 * @todo: figure out whether that is actually The Right Thing.
 	 */
 	public function getHTML( $shortContext = false, $longContext = false ) {
 		$text = $this->getWikiText( $shortContext, $longContext );