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rcube_result_thread.php
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rcube_result_thread.php
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<?php
/*
+-----------------------------------------------------------------------+
| This file is part of the Roundcube Webmail client |
| Copyright (C) 2005-2011, The Roundcube Dev Team |
| Copyright (C) 2011, Kolab Systems AG |
| |
| Licensed under the GNU General Public License version 3 or |
| any later version with exceptions for skins & plugins. |
| See the README file for a full license statement. |
| |
| PURPOSE: |
| THREAD response handler |
+-----------------------------------------------------------------------+
| Author: Thomas Bruederli <roundcube@gmail.com> |
| Author: Aleksander Machniak <alec@alec.pl> |
+-----------------------------------------------------------------------+
*/
/**
* Class for accessing IMAP's THREAD result
*
* @package Framework
* @subpackage Storage
*/
class rcube_result_thread
{
protected $raw_data;
protected $mailbox;
protected $meta = array();
protected $order = 'ASC';
const SEPARATOR_ELEMENT = ' ';
const SEPARATOR_ITEM = '~';
const SEPARATOR_LEVEL = ':';
/**
* Object constructor.
*/
public function __construct($mailbox = null, $data = null)
{
$this->mailbox = $mailbox;
$this->init($data);
}
/**
* Initializes object with IMAP command response
*
* @param string $data IMAP response string
*/
public function init($data = null)
{
$this->meta = array();
$data = explode('*', (string)$data);
// ...skip unilateral untagged server responses
for ($i=0, $len=count($data); $i<$len; $i++) {
if (preg_match('/^ THREAD/i', $data[$i])) {
// valid response, initialize raw_data for is_error()
$this->raw_data = '';
$data[$i] = substr($data[$i], 7);
break;
}
unset($data[$i]);
}
if (empty($data)) {
return;
}
$data = array_shift($data);
$data = trim($data);
$data = preg_replace('/[\r\n]/', '', $data);
$data = preg_replace('/\s+/', ' ', $data);
$this->raw_data = $this->parse_thread($data);
}
/**
* Checks the result from IMAP command
*
* @return bool True if the result is an error, False otherwise
*/
public function is_error()
{
return $this->raw_data === null ? true : false;
}
/**
* Checks if the result is empty
*
* @return bool True if the result is empty, False otherwise
*/
public function is_empty()
{
return empty($this->raw_data) ? true : false;
}
/**
* Returns number of elements (threads) in the result
*
* @return int Number of elements
*/
public function count()
{
if ($this->meta['count'] !== null)
return $this->meta['count'];
if (empty($this->raw_data)) {
$this->meta['count'] = 0;
}
else {
$this->meta['count'] = 1 + substr_count($this->raw_data, self::SEPARATOR_ELEMENT);
}
if (!$this->meta['count'])
$this->meta['messages'] = 0;
return $this->meta['count'];
}
/**
* Returns number of all messages in the result
*
* @return int Number of elements
*/
public function count_messages()
{
if ($this->meta['messages'] !== null)
return $this->meta['messages'];
if (empty($this->raw_data)) {
$this->meta['messages'] = 0;
}
else {
$this->meta['messages'] = 1
+ substr_count($this->raw_data, self::SEPARATOR_ELEMENT)
+ substr_count($this->raw_data, self::SEPARATOR_ITEM);
}
if ($this->meta['messages'] == 0 || $this->meta['messages'] == 1)
$this->meta['count'] = $this->meta['messages'];
return $this->meta['messages'];
}
/**
* Returns maximum message identifier in the result
*
* @return int Maximum message identifier
*/
public function max()
{
if (!isset($this->meta['max'])) {
$this->meta['max'] = (int) @max($this->get());
}
return $this->meta['max'];
}
/**
* Returns minimum message identifier in the result
*
* @return int Minimum message identifier
*/
public function min()
{
if (!isset($this->meta['min'])) {
$this->meta['min'] = (int) @min($this->get());
}
return $this->meta['min'];
}
/**
* Slices data set.
*
* @param $offset Offset (as for PHP's array_slice())
* @param $length Number of elements (as for PHP's array_slice())
*/
public function slice($offset, $length)
{
$data = explode(self::SEPARATOR_ELEMENT, $this->raw_data);
$data = array_slice($data, $offset, $length);
$this->meta = array();
$this->meta['count'] = count($data);
$this->raw_data = implode(self::SEPARATOR_ELEMENT, $data);
}
/**
* Filters data set. Removes threads not listed in $roots list.
*
* @param array $roots List of IDs of thread roots.
*/
public function filter($roots)
{
$datalen = strlen($this->raw_data);
$roots = array_flip($roots);
$result = '';
$start = 0;
$this->meta = array();
$this->meta['count'] = 0;
while (($pos = @strpos($this->raw_data, self::SEPARATOR_ELEMENT, $start))
|| ($start < $datalen && ($pos = $datalen))
) {
$len = $pos - $start;
$elem = substr($this->raw_data, $start, $len);
$start = $pos + 1;
// extract root message ID
if ($npos = strpos($elem, self::SEPARATOR_ITEM)) {
$root = (int) substr($elem, 0, $npos);
}
else {
$root = $elem;
}
if (isset($roots[$root])) {
$this->meta['count']++;
$result .= self::SEPARATOR_ELEMENT . $elem;
}
}
$this->raw_data = ltrim($result, self::SEPARATOR_ELEMENT);
}
/**
* Reverts order of elements in the result
*/
public function revert()
{
$this->order = $this->order == 'ASC' ? 'DESC' : 'ASC';
if (empty($this->raw_data)) {
return;
}
$this->meta['pos'] = array();
$datalen = strlen($this->raw_data);
$result = '';
$start = 0;
while (($pos = @strpos($this->raw_data, self::SEPARATOR_ELEMENT, $start))
|| ($start < $datalen && ($pos = $datalen))
) {
$len = $pos - $start;
$elem = substr($this->raw_data, $start, $len);
$start = $pos + 1;
$result = $elem . self::SEPARATOR_ELEMENT . $result;
}
$this->raw_data = rtrim($result, self::SEPARATOR_ELEMENT);
}
/**
* Check if the given message ID exists in the object
*
* @param int $msgid Message ID
* @param bool $get_index When enabled element's index will be returned.
* Elements are indexed starting with 0
*
* @return boolean True on success, False if message ID doesn't exist
*/
public function exists($msgid, $get_index = false)
{
$msgid = (int) $msgid;
$begin = implode('|', array(
'^',
preg_quote(self::SEPARATOR_ELEMENT, '/'),
preg_quote(self::SEPARATOR_LEVEL, '/'),
));
$end = implode('|', array(
'$',
preg_quote(self::SEPARATOR_ELEMENT, '/'),
preg_quote(self::SEPARATOR_ITEM, '/'),
));
if (preg_match("/($begin)$msgid($end)/", $this->raw_data, $m,
$get_index ? PREG_OFFSET_CAPTURE : null)
) {
if ($get_index) {
$idx = 0;
if ($m[0][1]) {
$idx = substr_count($this->raw_data, self::SEPARATOR_ELEMENT, 0, $m[0][1]+1)
+ substr_count($this->raw_data, self::SEPARATOR_ITEM, 0, $m[0][1]+1);
}
// cache position of this element, so we can use it in get_element()
$this->meta['pos'][$idx] = (int)$m[0][1];
return $idx;
}
return true;
}
return false;
}
/**
* Return IDs of all messages in the result. Threaded data will be flattened.
*
* @return array List of message identifiers
*/
public function get()
{
if (empty($this->raw_data)) {
return array();
}
$regexp = '/(' . preg_quote(self::SEPARATOR_ELEMENT, '/')
. '|' . preg_quote(self::SEPARATOR_ITEM, '/') . '[0-9]+' . preg_quote(self::SEPARATOR_LEVEL, '/')
.')/';
return preg_split($regexp, $this->raw_data);
}
/**
* Return all messages in the result.
*
* @return array List of message identifiers
*/
public function get_compressed()
{
if (empty($this->raw_data)) {
return '';
}
return rcube_imap_generic::compressMessageSet($this->get());
}
/**
* Return result element at specified index (all messages, not roots)
*
* @param int|string $index Element's index or "FIRST" or "LAST"
*
* @return int Element value
*/
public function get_element($index)
{
$count = $this->count();
if (!$count) {
return null;
}
// first element
if ($index === 0 || $index === '0' || $index === 'FIRST') {
preg_match('/^([0-9]+)/', $this->raw_data, $m);
$result = (int) $m[1];
return $result;
}
// last element
if ($index === 'LAST' || $index == $count-1) {
preg_match('/([0-9]+)$/', $this->raw_data, $m);
$result = (int) $m[1];
return $result;
}
// do we know the position of the element or the neighbour of it?
if (!empty($this->meta['pos'])) {
$element = preg_quote(self::SEPARATOR_ELEMENT, '/');
$item = preg_quote(self::SEPARATOR_ITEM, '/') . '[0-9]+' . preg_quote(self::SEPARATOR_LEVEL, '/') .'?';
$regexp = '(' . $element . '|' . $item . ')';
if (isset($this->meta['pos'][$index])) {
if (preg_match('/([0-9]+)/', $this->raw_data, $m, null, $this->meta['pos'][$index]))
$result = $m[1];
}
else if (isset($this->meta['pos'][$index-1])) {
// get chunk of data after previous element
$data = substr($this->raw_data, $this->meta['pos'][$index-1]+1, 50);
$data = preg_replace('/^[0-9]+/', '', $data); // remove UID at $index position
$data = preg_replace("/^$regexp/", '', $data); // remove separator
if (preg_match('/^([0-9]+)/', $data, $m))
$result = $m[1];
}
else if (isset($this->meta['pos'][$index+1])) {
// get chunk of data before next element
$pos = max(0, $this->meta['pos'][$index+1] - 50);
$len = min(50, $this->meta['pos'][$index+1]);
$data = substr($this->raw_data, $pos, $len);
$data = preg_replace("/$regexp\$/", '', $data); // remove separator
if (preg_match('/([0-9]+)$/', $data, $m))
$result = $m[1];
}
if (isset($result)) {
return (int) $result;
}
}
// Finally use less effective method
$data = $this->get();
return $data[$index];
}
/**
* Returns response parameters e.g. MAILBOX, ORDER
*
* @param string $param Parameter name
*
* @return array|string Response parameters or parameter value
*/
public function get_parameters($param=null)
{
$params = $this->params;
$params['MAILBOX'] = $this->mailbox;
$params['ORDER'] = $this->order;
if ($param !== null) {
return $params[$param];
}
return $params;
}
/**
* THREAD=REFS sorting implementation (based on provided index)
*
* @param rcube_result_index $index Sorted message identifiers
*/
public function sort($index)
{
$this->sort_order = $index->get_parameters('ORDER');
if (empty($this->raw_data)) {
return;
}
// when sorting search result it's good to make the index smaller
if ($index->count() != $this->count_messages()) {
$index->intersect($this->get());
}
$result = array_fill_keys($index->get(), null);
$datalen = strlen($this->raw_data);
$start = 0;
// Here we're parsing raw_data twice, we want only one big array
// in memory at a time
// Assign roots
while (($pos = @strpos($this->raw_data, self::SEPARATOR_ELEMENT, $start))
|| ($start < $datalen && ($pos = $datalen))
) {
$len = $pos - $start;
$elem = substr($this->raw_data, $start, $len);
$start = $pos + 1;
$items = explode(self::SEPARATOR_ITEM, $elem);
$root = (int) array_shift($items);
if ($root) {
$result[$root] = $root;
foreach ($items as $item) {
list($lv, $id) = explode(self::SEPARATOR_LEVEL, $item);
$result[$id] = $root;
}
}
}
// get only unique roots
$result = array_filter($result); // make sure there are no nulls
$result = array_unique($result);
// Re-sort raw data
$result = array_fill_keys($result, null);
$start = 0;
while (($pos = @strpos($this->raw_data, self::SEPARATOR_ELEMENT, $start))
|| ($start < $datalen && ($pos = $datalen))
) {
$len = $pos - $start;
$elem = substr($this->raw_data, $start, $len);
$start = $pos + 1;
$npos = strpos($elem, self::SEPARATOR_ITEM);
$root = (int) ($npos ? substr($elem, 0, $npos) : $elem);
$result[$root] = $elem;
}
$this->raw_data = implode(self::SEPARATOR_ELEMENT, $result);
}
/**
* Returns data as tree
*
* @return array Data tree
*/
public function get_tree()
{
$datalen = strlen($this->raw_data);
$result = array();
$start = 0;
while (($pos = @strpos($this->raw_data, self::SEPARATOR_ELEMENT, $start))
|| ($start < $datalen && ($pos = $datalen))
) {
$len = $pos - $start;
$elem = substr($this->raw_data, $start, $len);
$items = explode(self::SEPARATOR_ITEM, $elem);
$result[array_shift($items)] = $this->build_thread($items);
$start = $pos + 1;
}
return $result;
}
/**
* Returns thread depth and children data
*
* @return array Thread data
*/
public function get_thread_data()
{
$data = $this->get_tree();
$depth = array();
$children = array();
$this->build_thread_data($data, $depth, $children);
return array($depth, $children);
}
/**
* Creates 'depth' and 'children' arrays from stored thread 'tree' data.
*/
protected function build_thread_data($data, &$depth, &$children, $level = 0)
{
foreach ((array)$data as $key => $val) {
$empty = empty($val) || !is_array($val);
$children[$key] = !$empty;
$depth[$key] = $level;
if (!$empty) {
$this->build_thread_data($val, $depth, $children, $level + 1);
}
}
}
/**
* Converts part of the raw thread into an array
*/
protected function build_thread($items, $level = 1, &$pos = 0)
{
$result = array();
for ($len=count($items); $pos < $len; $pos++) {
list($lv, $id) = explode(self::SEPARATOR_LEVEL, $items[$pos]);
if ($level == $lv) {
$pos++;
$result[$id] = $this->build_thread($items, $level+1, $pos);
}
else {
$pos--;
break;
}
}
return $result;
}
/**
* IMAP THREAD response parser
*/
protected function parse_thread($str, $begin = 0, $end = 0, $depth = 0)
{
// Don't be tempted to change $str to pass by reference to speed this up - it will slow it down by about
// 7 times instead :-) See comments on http://uk2.php.net/references and this article:
// http://derickrethans.nl/files/phparch-php-variables-article.pdf
$node = '';
if (!$end) {
$end = strlen($str);
}
// Let's try to store data in max. compacted stracture as a string,
// arrays handling is much more expensive
// For the following structure: THREAD (2)(3 6 (4 23)(44 7 96))
// -- 2
//
// -- 3
// \-- 6
// |-- 4
// | \-- 23
// |
// \-- 44
// \-- 7
// \-- 96
//
// The output will be: 2,3^1:6^2:4^3:23^2:44^3:7^4:96
if ($str[$begin] != '(') {
$stop = $begin + strspn($str, '1234567890', $begin, $end - $begin);
$msg = substr($str, $begin, $stop - $begin);
if (!$msg) {
return $node;
}
$this->meta['messages']++;
$node .= ($depth ? self::SEPARATOR_ITEM.$depth.self::SEPARATOR_LEVEL : '').$msg;
if ($stop + 1 < $end) {
$node .= $this->parse_thread($str, $stop + 1, $end, $depth + 1);
}
} else {
$off = $begin;
while ($off < $end) {
$start = $off;
$off++;
$n = 1;
while ($n > 0) {
$p = strpos($str, ')', $off);
if ($p === false) {
// error, wrong structure, mismatched brackets in IMAP THREAD response
// @TODO: write error to the log or maybe set $this->raw_data = null;
return $node;
}
$p1 = strpos($str, '(', $off);
if ($p1 !== false && $p1 < $p) {
$off = $p1 + 1;
$n++;
} else {
$off = $p + 1;
$n--;
}
}
$thread = $this->parse_thread($str, $start + 1, $off - 1, $depth);
if ($thread) {
if (!$depth) {
if ($node) {
$node .= self::SEPARATOR_ELEMENT;
}
}
$node .= $thread;
}
}
}
return $node;
}
}

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