diff -r 000000000000 -r d970ebf37754 wp/wp-includes/class-wp-ajax-response.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/wp/wp-includes/class-wp-ajax-response.php	Wed Nov 06 03:21:17 2013 +0000
@@ -0,0 +1,139 @@
+<?php
+/**
+ * Send XML response back to AJAX request.
+ *
+ * @package WordPress
+ * @since 2.1.0
+ */
+class WP_Ajax_Response {
+	/**
+	 * Store XML responses to send.
+	 *
+	 * @since 2.1.0
+	 * @var array
+	 * @access private
+	 */
+	var $responses = array();
+
+	/**
+	 * Constructor - Passes args to {@link WP_Ajax_Response::add()}.
+	 *
+	 * @since 2.1.0
+	 * @see WP_Ajax_Response::add()
+	 *
+	 * @param string|array $args Optional. Will be passed to add() method.
+	 * @return WP_Ajax_Response
+	 */
+	function __construct( $args = '' ) {
+		if ( !empty($args) )
+			$this->add($args);
+	}
+
+	/**
+	 * Append to XML response based on given arguments.
+	 *
+	 * The arguments that can be passed in the $args parameter are below. It is
+	 * also possible to pass a WP_Error object in either the 'id' or 'data'
+	 * argument. The parameter isn't actually optional, content should be given
+	 * in order to send the correct response.
+	 *
+	 * 'what' argument is a string that is the XMLRPC response type.
+	 * 'action' argument is a boolean or string that acts like a nonce.
+	 * 'id' argument can be WP_Error or an integer.
+	 * 'old_id' argument is false by default or an integer of the previous ID.
+	 * 'position' argument is an integer or a string with -1 = top, 1 = bottom,
+	 * html ID = after, -html ID = before.
+	 * 'data' argument is a string with the content or message.
+	 * 'supplemental' argument is an array of strings that will be children of
+	 * the supplemental element.
+	 *
+	 * @since 2.1.0
+	 *
+	 * @param string|array $args Override defaults.
+	 * @return string XML response.
+	 */
+	function add( $args = '' ) {
+		$defaults = array(
+			'what' => 'object', 'action' => false,
+			'id' => '0', 'old_id' => false,
+			'position' => 1,
+			'data' => '', 'supplemental' => array()
+		);
+
+		$r = wp_parse_args( $args, $defaults );
+		extract( $r, EXTR_SKIP );
+		$position = preg_replace( '/[^a-z0-9:_-]/i', '', $position );
+
+		if ( is_wp_error($id) ) {
+			$data = $id;
+			$id = 0;
+		}
+
+		$response = '';
+		if ( is_wp_error($data) ) {
+			foreach ( (array) $data->get_error_codes() as $code ) {
+				$response .= "<wp_error code='$code'><![CDATA[" . $data->get_error_message($code) . "]]></wp_error>";
+				if ( !$error_data = $data->get_error_data($code) )
+					continue;
+				$class = '';
+				if ( is_object($error_data) ) {
+					$class = ' class="' . get_class($error_data) . '"';
+					$error_data = get_object_vars($error_data);
+				}
+
+				$response .= "<wp_error_data code='$code'$class>";
+
+				if ( is_scalar($error_data) ) {
+					$response .= "<![CDATA[$error_data]]>";
+				} elseif ( is_array($error_data) ) {
+					foreach ( $error_data as $k => $v )
+						$response .= "<$k><![CDATA[$v]]></$k>";
+				}
+
+				$response .= "</wp_error_data>";
+			}
+		} else {
+			$response = "<response_data><![CDATA[$data]]></response_data>";
+		}
+
+		$s = '';
+		if ( is_array($supplemental) ) {
+			foreach ( $supplemental as $k => $v )
+				$s .= "<$k><![CDATA[$v]]></$k>";
+			$s = "<supplemental>$s</supplemental>";
+		}
+
+		if ( false === $action )
+			$action = $_POST['action'];
+
+		$x = '';
+		$x .= "<response action='{$action}_$id'>"; // The action attribute in the xml output is formatted like a nonce action
+		$x .=	"<$what id='$id' " . ( false === $old_id ? '' : "old_id='$old_id' " ) . "position='$position'>";
+		$x .=		$response;
+		$x .=		$s;
+		$x .=	"</$what>";
+		$x .= "</response>";
+
+		$this->responses[] = $x;
+		return $x;
+	}
+
+	/**
+	 * Display XML formatted responses.
+	 *
+	 * Sets the content type header to text/xml.
+	 *
+	 * @since 2.1.0
+	 */
+	function send() {
+		header( 'Content-Type: text/xml; charset=' . get_option( 'blog_charset' ) );
+		echo "<?xml version='1.0' encoding='" . get_option( 'blog_charset' ) . "' standalone='yes'?><wp_ajax>";
+		foreach ( (array) $this->responses as $response )
+			echo $response;
+		echo '</wp_ajax>';
+		if ( defined( 'DOING_AJAX' ) && DOING_AJAX )
+			wp_die();
+		else
+			die();
+	}
+}