Fix regression in even sizing of diff columns; forgot to restore a couple bits I...

[mediawiki.git] / includes / api / ApiQueryRevisions.php

<?php

/*
 * Created on Sep 7, 2006
 *
 * API for MediaWiki 1.8+
 *
 * Copyright (C) 2006 Yuri Astrakhan <FirstnameLastname@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 * http://www.gnu.org/copyleft/gpl.html
 */

if (!defined('MEDIAWIKI')) {
        // Eclipse helper - will be ignored in production
        require_once ('ApiQueryBase.php');
}

/**
 * @addtogroup API
 */
class ApiQueryRevisions extends ApiQueryBase {

        public function __construct($query, $moduleName) {
                parent :: __construct($query, $moduleName, 'rv');
        }

        public function execute() {
                $limit = $startid = $endid = $start = $end = $dir = $prop = null;
                extract($this->extractRequestParams());

                // If any of those parameters are used, work in 'enumeration' mode.
                // Enum mode can only be used when exactly one page is provided.
                // Enumerating revisions on multiple pages make it extremelly 
                // difficult to manage continuations and require additional sql indexes  
                $enumRevMode = (!is_null($limit) || !is_null($startid) || !is_null($endid) || $dir === 'newer' || !is_null($start) || !is_null($end));

                $pageSet = $this->getPageSet();
                $pageCount = $pageSet->getGoodTitleCount();
                $revCount = $pageSet->getRevisionCount();

                // Optimization -- nothing to do
                if ($revCount === 0 && $pageCount === 0)
                        return;

                if ($revCount > 0 && $enumRevMode)
                        $this->dieUsage('The revids= parameter may not be used with the list options (limit, startid, endid, dirNewer, start, end).', 'revids');

                if ($pageCount > 1 && $enumRevMode)
                        $this->dieUsage('titles, pageids or a generator was used to supply multiple pages, but the limit, startid, endid, dirNewer, start, and end parameters may only be used on a single page.', 'multpages');

                $this->addTables('revision');
                $this->addFields(array (
                        'rev_id',
                        'rev_page',
                        'rev_text_id',
                        'rev_minor_edit'
                ));
                $this->addWhere('rev_deleted=0');

                $showContent = false;

                if (!is_null($prop)) {
                        $prop = array_flip($prop);
                        $this->addFieldsIf('rev_timestamp', isset ($prop['timestamp']));
                        $this->addFieldsIf('rev_comment', isset ($prop['comment']));
                        if (isset ($prop['user'])) {
                                $this->addFields('rev_user');
                                $this->addFields('rev_user_text');
                        }
                        if (isset ($prop['content'])) {
                                $this->addTables('text');
                                $this->addWhere('rev_text_id=old_id');
                                $this->addFields('old_id');
                                $this->addFields('old_text');
                                $this->addFields('old_flags');
                                $showContent = true;
                        }
                }

                $userMax = ($showContent ? 50 : 500);
                $botMax = ($showContent ? 200 : 10000);

                if ($enumRevMode) {

                        // This is mostly to prevent parameter errors (and optimize sql?)
                        if (!is_null($startid) && !is_null($start))
                                $this->dieUsage('start and startid cannot be used together', 'badparams');

                        if (!is_null($endid) && !is_null($end))
                                $this->dieUsage('end and endid cannot be used together', 'badparams');

                        // This code makes an assumption that sorting by rev_id and rev_timestamp produces
                        // the same result. This way users may request revisions starting at a given time,
                        // but to page through results use the rev_id returned after each page.
                        // Switching to rev_id removes the potential problem of having more than 
                        // one row with the same timestamp for the same page. 
                        // The order needs to be the same as start parameter to avoid SQL filesort.

                        if (is_null($startid))
                                $this->addWhereRange('rev_timestamp', $dir, $start, $end);
                        else
                                $this->addWhereRange('rev_id', $dir, $startid, $endid);

                        // must manually initialize unset limit
                        if (is_null($limit))
                                $limit = 10;
                        $this->validateLimit($this->encodeParamName('limit'), $limit, 1, $userMax, $botMax);

                        // There is only one ID, use it
                        $this->addWhereFld('rev_page', current(array_keys($pageSet->getGoodTitles())));
                }
                elseif ($pageCount > 0) {
                        // When working in multi-page non-enumeration mode,
                        // limit to the latest revision only
                        $this->addTables('page');
                        $this->addWhere('page_id=rev_page');
                        $this->addWhere('page_latest=rev_id');
                        $this->validateLimit('page_count', $pageCount, 1, $userMax, $botMax);

                        // Get all page IDs
                        $this->addWhereFld('page_id', array_keys($pageSet->getGoodTitles()));

                        $limit = $pageCount; // assumption testing -- we should never get more then $pageCount rows.
                }
                elseif ($revCount > 0) {
                        $this->validateLimit('rev_count', $revCount, 1, $userMax, $botMax);

                        // Get all revision IDs
                        $this->addWhereFld('rev_id', array_keys($pageSet->getRevisionIDs()));

                        $limit = $revCount; // assumption testing -- we should never get more then $revCount rows.
                } else
                        ApiBase :: dieDebug(__METHOD__, 'param validation?');

                $this->addOption('LIMIT', $limit +1);

                $data = array ();
                $count = 0;
                $res = $this->select(__METHOD__);

                $db = $this->getDB();
                while ($row = $db->fetchObject($res)) {

                        if (++ $count > $limit) {
                                // We've reached the one extra which shows that there are additional pages to be had. Stop here...
                                if (!$enumRevMode)
                                        ApiBase :: dieDebug(__METHOD__, 'Got more rows then expected'); // bug report
                                $this->setContinueEnumParameter('startid', $row->rev_id);
                                break;
                        }

                        $vals = $this->addRowInfo('rev', $row);
                        if ($vals) {
                                if ($showContent)
                                        ApiResult :: setContent($vals, Revision :: getRevisionText($row));

                                $this->getResult()->addValue(array (
                                        'query',
                                        'pages',
                                        intval($row->rev_page
                                ), 'revisions'), intval($row->rev_id), $vals);
                        }
                }
                $db->freeResult($res);

                // Ensure that all revisions are shown as '<rev>' elements
                $result = $this->getResult();
                if ($result->getIsRawMode()) {
                        $data =& $result->getData();
                        foreach ($data['query']['pages'] as & $page) {
                                if (is_array($page) && array_key_exists('revisions', $page)) {
                                        $result->setIndexedTagName($page['revisions'], 'rev');
                                }
                        }
                }
        }

        protected function getAllowedParams() {
                return array (
                        'prop' => array (
                                ApiBase :: PARAM_ISMULTI => true,
                                ApiBase :: PARAM_TYPE => array (
                                        'timestamp',
                                        'user',
                                        'comment',
                                        'content'
                                )
                        ),
                        'limit' => array (
                                ApiBase :: PARAM_TYPE => 'limit',
                                ApiBase :: PARAM_MIN => 1,
                                ApiBase :: PARAM_MAX1 => ApiBase :: LIMIT_SML1,
                                ApiBase :: PARAM_MAX2 => ApiBase :: LIMIT_SML2
                        ),
                        'startid' => array (
                                ApiBase :: PARAM_TYPE => 'integer'
                        ),
                        'endid' => array (
                                ApiBase :: PARAM_TYPE => 'integer'
                        ),
                        'start' => array (
                                ApiBase :: PARAM_TYPE => 'timestamp'
                        ),
                        'end' => array (
                                ApiBase :: PARAM_TYPE => 'timestamp'
                        ),
                        'dir' => array (
                                ApiBase :: PARAM_DFLT => 'older',
                                ApiBase :: PARAM_TYPE => array (
                                        'newer',
                                        'older'
                                )
                        )
                );
        }

        protected function getParamDescription() {
                return array (
                        'prop' => 'Which properties to get for each revision.',
                        'limit' => 'limit how many revisions will be returned (enum)',
                        'startid' => 'from which revision id to start enumeration (enum)',
                        'endid' => 'stop revision enumeration on this revid (enum)',
                        'start' => 'from which revision timestamp to start enumeration (enum)',
                        'end' => 'enumerate up to this timestamp (enum)',
                        'dir' => 'direction of enumeration - towards "newer" or "older" revisions (enum)'
                );
        }

        protected function getDescription() {
                return array (
                        'Get revision information.',
                        'This module may be used in several ways:',
                        ' 1) Get data about a set of pages (last revision), by setting titles or pageids parameter.',
                        ' 2) Get revisions for one given page, by using titles/pageids with start/end/limit params.',
                        ' 3) Get data about a set of revisions by setting their IDs with revids parameter.',
                        'All parameters marked as (enum) may only be used with a single page (#2).'
                );
        }

        protected function getExamples() {
                return array (
                        'Get data with content for the last revision of titles "API" and "Main Page":',
                        '  api.php?action=query&prop=revisions&titles=API|Main%20Page&rvprop=timestamp|user|comment|content',
                        'Get last 5 revisions of the "Main Page":',
                        '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment',
                        'Get first 5 revisions of the "Main Page":',
                        '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer',
                        'Get first 5 revisions of the "Main Page" made after 2006-05-01:',
                        '  api.php?action=query&prop=revisions&titles=Main%20Page&rvlimit=5&rvprop=timestamp|user|comment&rvdir=newer&rvstart=20060501000000'
                );
        }

        public function getVersion() {
                return __CLASS__ . ': $Id$';
        }
}
?>