<?php
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/**
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+-----------------------------------------------------------------------+
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| This file is part of the Roundcube Webmail client |
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| Copyright (C) 2005-2011, The Roundcube Dev Team |
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| Copyright (C) 2011, Kolab Systems AG |
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| |
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| Licensed under the GNU General Public License version 3 or |
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| any later version with exceptions for skins & plugins. |
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| See the README file for a full license statement. |
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| |
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| PURPOSE: |
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| SORT/SEARCH/ESEARCH response handler |
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+-----------------------------------------------------------------------+
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| Author: Thomas Bruederli <roundcube@gmail.com> |
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| Author: Aleksander Machniak <alec@alec.pl> |
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+-----------------------------------------------------------------------+
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*/
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/**
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* Class for accessing IMAP's SORT/SEARCH/ESEARCH result
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*
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* @package Framework
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* @subpackage Storage
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*/
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class rcube_result_index
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{
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public $incomplete = false;
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protected $raw_data;
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protected $mailbox;
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protected $meta = array();
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protected $params = array();
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protected $order = 'ASC';
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const SEPARATOR_ELEMENT = ' ';
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/**
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* Object constructor.
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*/
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public function __construct($mailbox = null, $data = null, $order = null)
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{
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$this->mailbox = $mailbox;
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$this->order = $order == 'DESC' ? 'DESC' : 'ASC';
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$this->init($data);
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}
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/**
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* Initializes object with SORT command response
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*
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* @param string $data IMAP response string
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*/
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public function init($data = null)
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{
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$this->meta = array();
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$data = explode('*', (string)$data);
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// ...skip unilateral untagged server responses
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for ($i=0, $len=count($data); $i<$len; $i++) {
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$data_item = &$data[$i];
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if (preg_match('/^ SORT/i', $data_item)) {
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// valid response, initialize raw_data for is_error()
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$this->raw_data = '';
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$data_item = substr($data_item, 5);
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break;
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}
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else if (preg_match('/^ (E?SEARCH)/i', $data_item, $m)) {
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// valid response, initialize raw_data for is_error()
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$this->raw_data = '';
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$data_item = substr($data_item, strlen($m[0]));
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if (strtoupper($m[1]) == 'ESEARCH') {
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$data_item = trim($data_item);
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// remove MODSEQ response
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if (preg_match('/\(MODSEQ ([0-9]+)\)$/i', $data_item, $m)) {
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$data_item = substr($data_item, 0, -strlen($m[0]));
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$this->params['MODSEQ'] = $m[1];
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}
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// remove TAG response part
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if (preg_match('/^\(TAG ["a-z0-9]+\)\s*/i', $data_item, $m)) {
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$data_item = substr($data_item, strlen($m[0]));
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}
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// remove UID
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$data_item = preg_replace('/^UID\s*/i', '', $data_item);
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// ESEARCH parameters
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while (preg_match('/^([a-z]+) ([0-9:,]+)\s*/i', $data_item, $m)) {
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$param = strtoupper($m[1]);
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$value = $m[2];
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$this->params[$param] = $value;
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$data_item = substr($data_item, strlen($m[0]));
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if (in_array($param, array('COUNT', 'MIN', 'MAX'))) {
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$this->meta[strtolower($param)] = (int) $value;
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}
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}
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// @TODO: Implement compression using compressMessageSet() in __sleep() and __wakeup() ?
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// @TODO: work with compressed result?!
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if (isset($this->params['ALL'])) {
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$data_item = implode(self::SEPARATOR_ELEMENT,
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rcube_imap_generic::uncompressMessageSet($this->params['ALL']));
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}
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}
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break;
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}
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unset($data[$i]);
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}
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$data = array_filter($data);
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if (empty($data)) {
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return;
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}
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$data = array_shift($data);
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$data = trim($data);
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$data = preg_replace('/[\r\n]/', '', $data);
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$data = preg_replace('/\s+/', ' ', $data);
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$this->raw_data = $data;
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}
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/**
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* Checks the result from IMAP command
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*
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* @return bool True if the result is an error, False otherwise
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*/
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public function is_error()
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{
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return $this->raw_data === null ? true : false;
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}
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/**
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* Checks if the result is empty
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*
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* @return bool True if the result is empty, False otherwise
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*/
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public function is_empty()
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{
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return empty($this->raw_data) ? true : false;
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}
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/**
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* Returns number of elements in the result
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*
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* @return int Number of elements
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*/
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public function count()
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{
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if ($this->meta['count'] !== null)
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return $this->meta['count'];
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if (empty($this->raw_data)) {
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$this->meta['count'] = 0;
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$this->meta['length'] = 0;
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}
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else {
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$this->meta['count'] = 1 + substr_count($this->raw_data, self::SEPARATOR_ELEMENT);
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}
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return $this->meta['count'];
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}
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/**
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* Returns number of elements in the result.
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* Alias for count() for compatibility with rcube_result_thread
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*
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* @return int Number of elements
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*/
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public function count_messages()
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{
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return $this->count();
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}
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/**
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* Returns maximal message identifier in the result
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*
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* @return int Maximal message identifier
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*/
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public function max()
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{
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if (!isset($this->meta['max'])) {
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$this->meta['max'] = (int) @max($this->get());
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}
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return $this->meta['max'];
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}
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/**
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* Returns minimal message identifier in the result
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*
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* @return int Minimal message identifier
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*/
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public function min()
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{
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if (!isset($this->meta['min'])) {
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$this->meta['min'] = (int) @min($this->get());
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}
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return $this->meta['min'];
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}
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/**
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* Slices data set.
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*
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* @param $offset Offset (as for PHP's array_slice())
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* @param $length Number of elements (as for PHP's array_slice())
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*/
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public function slice($offset, $length)
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{
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$data = $this->get();
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$data = array_slice($data, $offset, $length);
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$this->meta = array();
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$this->meta['count'] = count($data);
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$this->raw_data = implode(self::SEPARATOR_ELEMENT, $data);
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}
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/**
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* Filters data set. Removes elements not listed in $ids list.
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*
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* @param array $ids List of IDs to remove.
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*/
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public function filter($ids = array())
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{
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$data = $this->get();
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$data = array_intersect($data, $ids);
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$this->meta = array();
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$this->meta['count'] = count($data);
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$this->raw_data = implode(self::SEPARATOR_ELEMENT, $data);
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}
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/**
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* Reverts order of elements in the result
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*/
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public function revert()
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{
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$this->order = $this->order == 'ASC' ? 'DESC' : 'ASC';
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if (empty($this->raw_data)) {
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return;
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}
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// @TODO: maybe do this in chunks
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$data = $this->get();
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$data = array_reverse($data);
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$this->raw_data = implode(self::SEPARATOR_ELEMENT, $data);
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$this->meta['pos'] = array();
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}
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/**
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* Check if the given message ID exists in the object
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*
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* @param int $msgid Message ID
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* @param bool $get_index When enabled element's index will be returned.
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* Elements are indexed starting with 0
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*
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* @return mixed False if message ID doesn't exist, True if exists or
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* index of the element if $get_index=true
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*/
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public function exists($msgid, $get_index = false)
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{
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if (empty($this->raw_data)) {
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return false;
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}
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$msgid = (int) $msgid;
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$begin = implode('|', array('^', preg_quote(self::SEPARATOR_ELEMENT, '/')));
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$end = implode('|', array('$', preg_quote(self::SEPARATOR_ELEMENT, '/')));
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if (preg_match("/($begin)$msgid($end)/", $this->raw_data, $m,
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$get_index ? PREG_OFFSET_CAPTURE : null)
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) {
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if ($get_index) {
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$idx = 0;
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if ($m[0][1]) {
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$idx = 1 + substr_count($this->raw_data, self::SEPARATOR_ELEMENT, 0, $m[0][1]);
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}
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// cache position of this element, so we can use it in get_element()
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$this->meta['pos'][$idx] = (int)$m[0][1];
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return $idx;
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}
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return true;
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}
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return false;
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}
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/**
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* Return all messages in the result.
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*
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* @return array List of message IDs
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*/
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public function get()
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{
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if (empty($this->raw_data)) {
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return array();
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}
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return explode(self::SEPARATOR_ELEMENT, $this->raw_data);
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}
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/**
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* Return all messages in the result.
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*
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* @return array List of message IDs
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*/
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public function get_compressed()
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{
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if (empty($this->raw_data)) {
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return '';
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}
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return rcube_imap_generic::compressMessageSet($this->get());
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}
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/**
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* Return result element at specified index
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*
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* @param int|string $index Element's index or "FIRST" or "LAST"
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*
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* @return int Element value
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*/
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public function get_element($index)
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{
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$count = $this->count();
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if (!$count) {
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return null;
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}
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// first element
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if ($index === 0 || $index === '0' || $index === 'FIRST') {
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$pos = strpos($this->raw_data, self::SEPARATOR_ELEMENT);
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if ($pos === false)
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$result = (int) $this->raw_data;
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else
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$result = (int) substr($this->raw_data, 0, $pos);
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return $result;
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}
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// last element
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if ($index === 'LAST' || $index == $count-1) {
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$pos = strrpos($this->raw_data, self::SEPARATOR_ELEMENT);
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if ($pos === false)
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$result = (int) $this->raw_data;
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else
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$result = (int) substr($this->raw_data, $pos);
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return $result;
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}
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// do we know the position of the element or the neighbour of it?
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if (!empty($this->meta['pos'])) {
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if (isset($this->meta['pos'][$index]))
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$pos = $this->meta['pos'][$index];
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else if (isset($this->meta['pos'][$index-1]))
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$pos = strpos($this->raw_data, self::SEPARATOR_ELEMENT,
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$this->meta['pos'][$index-1] + 1);
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else if (isset($this->meta['pos'][$index+1]))
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$pos = strrpos($this->raw_data, self::SEPARATOR_ELEMENT,
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$this->meta['pos'][$index+1] - $this->length() - 1);
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if (isset($pos) && preg_match('/([0-9]+)/', $this->raw_data, $m, null, $pos)) {
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return (int) $m[1];
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}
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}
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// Finally use less effective method
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$data = explode(self::SEPARATOR_ELEMENT, $this->raw_data);
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return $data[$index];
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}
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/**
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* Returns response parameters, e.g. ESEARCH's MIN/MAX/COUNT/ALL/MODSEQ
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* or internal data e.g. MAILBOX, ORDER
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*
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* @param string $param Parameter name
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*
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* @return array|string Response parameters or parameter value
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*/
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public function get_parameters($param=null)
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{
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$params = $this->params;
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$params['MAILBOX'] = $this->mailbox;
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$params['ORDER'] = $this->order;
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if ($param !== null) {
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return $params[$param];
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}
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return $params;
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}
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/**
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* Returns length of internal data representation
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*
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* @return int Data length
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*/
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protected function length()
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{
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if (!isset($this->meta['length'])) {
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$this->meta['length'] = strlen($this->raw_data);
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}
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return $this->meta['length'];
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}
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}
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