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<?php
/**
* IMAP_Thread provides functions for working with imap_thread() output.
*
* $Horde: framework/IMAP/IMAP/Thread.php,v 1.4.10.13 2006/01/01 21:28:21 jan Exp $
*
* Copyright 2004-2006 Michael Slusarz <slusarz@curecanti.org>
*
* See the enclosed file COPYING for license information (GPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/gpl.html.
*
* @author Michael Slusarz <slusarz@curecanti.org>
* @since Horde 3.0
* @package Horde_IMAP
*/
class IMAP_Thread {
/**
* imap_thread() output.
*
* @var array
*/
var $_threadarray;
/**
* Internal thread data structure.
*
* @var array
*/
var $_thread = array();
/**
* Array index to Message index lookup array.
*
* @var array
*/
var $_lookup = array();
/**
* Constructor.
*
* @param array $ob Output from imap_thread().
*/
function IMAP_Thread($ob)
{
$this->_threadarray = $ob;
$this->_processStructure();
}
/**
* Gets the indention level for an IMAP message index.
*
* @param integer $index The IMAP message index.
*
* @return mixed Returns the thread indent level if $index found.
* Returns false on failure.
*/
function getThreadIndent($index)
{
$key = $this->_getKey($index);
if (!is_null($key)) {
if (isset($this->_thread[$key]['level'])) {
return $this->_thread[$key]['level'];
}
}
return false;
}
/**
* Gets the base thread index for an IMAP message index.
*
* @param integer $index The IMAP message index.
*
* @return mixed Returns the base IMAP index if $index is part of a
* thread.
* Returns false on failure.
*/
function getThreadBase($index)
{
$key = $this->_getKey($index);
if (!is_null($key)) {
if (!empty($this->_thread[$key]['base'])) {
return $this->_thread[$key]['base'];
}
}
return false;
}
/**
* Is this index the last in the current level?
*
* @param integer $index The IMAP message index.
*
* @return boolean Returns true if $index is the last element in the
* current thread level.
* Returns false if not, or on failure.
*/
function lastInLevel($index)
{
$key = $this->_getKey($index);
if (!is_null($key)) {
if (!empty($this->_thread[$key]['last'])) {
return $this->_thread[$key]['last'];
}
}
return false;
}
/**
* Do the message index -> array index lookup.
*
* @access private
*
* @param integer $index The IMAP message index.
*
* @return mixed The array index value or null if no index.
*/
function _getKey($index)
{
return (isset($this->_lookup[$index])) ? $this->_lookup[$index] : null;
}
/**
* Return the sorted list of messages indices.
*
* @param boolean $new True for newest first, false for oldest first.
*
* @return array The sorted list of messages.
*/
function messageList($new)
{
return ($new) ? array_reverse(array_keys($this->_lookup)) : array_keys($this->_lookup);
}
/**
* Returns the list of messages in the current thread.
*
* @param integer $index The IMAP index of the current message.
*
* @return array A list of IMAP message indices.
*/
function getThread($index)
{
/* Find the beginning of the thread. */
$begin = $this->getThreadBase($index);
$key = $this->_getKey($begin);
if (is_null($key) || empty($begin)) {
return array($index);
}
/* Work forward from the first thread element to find the end of the
* thread. */
$thread_list = array($this->_thread[$key]['index']);
while (++$key) {
if (!isset($this->_thread[$key])) {
break;
}
$curr = $this->_thread[$key];
if ($curr['base'] == $begin) {
$thread_list[] = $this->_thread[$key]['index'];
} else {
break;
}
}
return $thread_list;
}
/**
* Process the output from imap_thread() into an internal data structure.
*
* @access private
*/
function _processStructure()
{
$container = $container_base = $last_index = $thread_base = $thread_base_idx = null;
$indices = array();
$i = $last_i = $level = 0;
foreach ($this->_threadarray as $key => $val) {
$pos = strpos($key, '.');
$index = substr($key, 0, $pos);
$type = substr($key, $pos + 1);
switch ($type) {
case 'num':
if ($val === 0) {
$container = $index;
} else {
$i++;
if (is_null($container) && empty($level)) {
$thread_base = $val;
$thread_base_idx = $index;
}
$this->_lookup[$val] = $index;
$this->_thread[$index] = array();
$this->_thread[$index]['index'] = $val;
}
break;
case 'next':
if (!is_null($container) && ($container === $index)) {
$container_base = $this->_threadarray[$val . '.num'];
} else {
$i++;
if (!is_null($container)) {
$this->_thread[$index]['base'] = $container_base;
} else {
$this->_thread[$index]['base'] = (!empty($level) || ($val != 0)) ? $thread_base : null;
}
$level++;
}
break;
case 'branch':
if ($container === $index) {
$container = $container_base = null;
$this->_thread[$last_index]['last'] = true;
} else {
$this->_thread[$index]['level'] = $level--;
$this->_thread[$index]['last'] = !(!is_null($container) && empty($level));
if ($index === $thread_base_idx) {
$index = null;
} elseif (!empty($level) &&
!is_null($last_index) &&
isset($this->_thread[$last_index])) {
$this->_thread[$last_index]['last'] = ($last_i == ($i - 1));
}
}
$last_index = $index;
$last_i = $i++;
break;
}
}
}
}
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