includes/api/ApiQueryAllLinks.php

   1 <?php
   2 /**
   3  *
   4  *
   5  * Created on July 7, 2007
   6  *
   7  * Copyright © 2006 Yuri Astrakhan "<Firstname><Lastname>@gmail.com"
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write to the Free Software Foundation, Inc.,
  21  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  * http://www.gnu.org/copyleft/gpl.html
  23  *
  24  * @file
  25  */
  26
  27 /**
  28  * Query module to enumerate links from all pages together.
  29  *
  30  * @ingroup API
  31  */
  32 class ApiQueryAllLinks extends ApiQueryGeneratorBase {
  33
  34         public function __construct( $query, $moduleName ) {
  35                 switch ( $moduleName ) {
  36                         case 'alllinks':
  37                                 $prefix = 'al';
  38                                 $this->table = 'pagelinks';
  39                                 $this->tablePrefix = 'pl_';
  40                                 $this->dfltNamespace = NS_MAIN;
  41                                 $this->indexTag = 'l';
  42                                 $this->description = 'Enumerate all links that point to a given namespace';
  43                                 $this->descriptionLink = 'link';
  44                                 $this->descriptionLinked = 'linked';
  45                                 $this->descriptionLinking = 'linking';
  46                                 break;
  47                         case 'alltransclusions':
  48                                 $prefix = 'at';
  49                                 $this->table = 'templatelinks';
  50                                 $this->tablePrefix = 'tl_';
  51                                 $this->dfltNamespace = NS_TEMPLATE;
  52                                 $this->indexTag = 't';
  53                                 $this->description = 'List all transclusions (pages embedded using {{x}}), including non-existing';
  54                                 $this->descriptionLink = 'transclusion';
  55                                 $this->descriptionLinked = 'transcluded';
  56                                 $this->descriptionLinking = 'transcluding';
  57                                 break;
  58                         default:
  59                                 ApiBase::dieDebug( __METHOD__, 'Unknown module name' );
  60                 }
  61
  62                 parent::__construct( $query, $moduleName, $prefix );
  63         }
  64
  65         public function execute() {
  66                 $this->run();
  67         }
  68
  69         public function getCacheMode( $params ) {
  70                 return 'public';
  71         }
  72
  73         public function executeGenerator( $resultPageSet ) {
  74                 $this->run( $resultPageSet );
  75         }
  76
  77         /**
  78          * @param $resultPageSet ApiPageSet
  79          * @return void
  80          */
  81         private function run( $resultPageSet = null ) {
  82                 $db = $this->getDB();
  83                 $params = $this->extractRequestParams();
  84
  85                 $pfx = $this->tablePrefix;
  86                 $prop = array_flip( $params['prop'] );
  87                 $fld_ids = isset( $prop['ids'] );
  88                 $fld_title = isset( $prop['title'] );
  89
  90                 if ( $params['unique'] ) {
  91                         if ( $fld_ids ) {
  92                                 $this->dieUsage(
  93                                         "{$this->getModuleName()} cannot return corresponding page ids in unique {$this->descriptionLink}s mode",
  94                                         'params' );
  95                         }
  96                         $this->addOption( 'DISTINCT' );
  97                 }
  98
  99                 $this->addTables( $this->table );
 100                 $this->addWhereFld( $pfx . 'namespace', $params['namespace'] );
 101
 102                 $continue = !is_null( $params['continue'] );
 103                 if ( $continue ) {
 104                         $continueArr = explode( '|', $params['continue'] );
 105                         $op = $params['dir'] == 'descending' ? '<' : '>';
 106                         if ( $params['unique'] ) {
 107                                 $this->dieContinueUsageIf( count( $continueArr ) != 1 );
 108                                 $continueTitle = $db->addQuotes( $continueArr[0] );
 109                                 $this->addWhere( "{$pfx}title $op= $continueTitle" );
 110                         } else {
 111                                 $this->dieContinueUsageIf( count( $continueArr ) != 2 );
 112                                 $continueTitle = $db->addQuotes( $continueArr[0] );
 113                                 $continueFrom = intval( $continueArr[1] );
 114                                 $this->addWhere(
 115                                         "{$pfx}title $op $continueTitle OR " .
 116                                         "({$pfx}title = $continueTitle AND " .
 117                                         "{$pfx}from $op= $continueFrom)"
 118                                 );
 119                         }
 120                 }
 121
 122                 // 'continue' always overrides 'from'
 123                 $from = ( $continue || is_null( $params['from'] ) ? null : $this->titlePartToKey( $params['from'] ) );
 124                 $to = ( is_null( $params['to'] ) ? null : $this->titlePartToKey( $params['to'] ) );
 125                 $this->addWhereRange( $pfx . 'title', 'newer', $from, $to );
 126
 127                 if ( isset( $params['prefix'] ) ) {
 128                         $this->addWhere( $pfx . 'title' . $db->buildLike( $this->titlePartToKey( $params['prefix'] ), $db->anyString() ) );
 129                 }
 130
 131                 $this->addFields( array( 'pl_title' => $pfx . 'title' ) );
 132                 $this->addFieldsIf( array( 'pl_from' => $pfx . 'from' ), !$params['unique'] );
 133
 134                 $this->addOption( 'USE INDEX', $pfx . 'namespace' );
 135                 $limit = $params['limit'];
 136                 $this->addOption( 'LIMIT', $limit + 1 );
 137
 138                 $sort = ( $params['dir'] == 'descending' ? ' DESC' : '' );
 139                 $orderBy = array();
 140                 $orderBy[] = $pfx . 'title' . $sort;
 141                 if ( !$params['unique'] ) {
 142                         $orderBy[] = $pfx . 'from' . $sort;
 143                 }
 144                 $this->addOption( 'ORDER BY', $orderBy );
 145
 146                 $res = $this->select( __METHOD__ );
 147
 148                 $pageids = array();
 149                 $titles = array();
 150                 $count = 0;
 151                 $result = $this->getResult();
 152                 foreach ( $res as $row ) {
 153                         if ( ++ $count > $limit ) {
 154                                 // We've reached the one extra which shows that there are additional pages to be had. Stop here...
 155                                 if ( $params['unique'] ) {
 156                                         $this->setContinueEnumParameter( 'continue', $row->pl_title );
 157                                 } else {
 158                                         $this->setContinueEnumParameter( 'continue', $row->pl_title . '|' . $row->pl_from );
 159                                 }
 160                                 break;
 161                         }
 162
 163                         if ( is_null( $resultPageSet ) ) {
 164                                 $vals = array();
 165                                 if ( $fld_ids ) {
 166                                         $vals['fromid'] = intval( $row->pl_from );
 167                                 }
 168                                 if ( $fld_title ) {
 169                                         $title = Title::makeTitle( $params['namespace'], $row->pl_title );
 170                                         ApiQueryBase::addTitleInfo( $vals, $title );
 171                                 }
 172                                 $fit = $result->addValue( array( 'query', $this->getModuleName() ), null, $vals );
 173                                 if ( !$fit ) {
 174                                         if ( $params['unique'] ) {
 175                                                 $this->setContinueEnumParameter( 'continue', $row->pl_title );
 176                                         } else {
 177                                                 $this->setContinueEnumParameter( 'continue', $row->pl_title . '|' . $row->pl_from );
 178                                         }
 179                                         break;
 180                                 }
 181                         } elseif ( $params['unique'] ) {
 182                                 $titles[] = Title::makeTitle( $params['namespace'], $row->pl_title );
 183                         } else {
 184                                 $pageids[] = $row->pl_from;
 185                         }
 186                 }
 187
 188                 if ( is_null( $resultPageSet ) ) {
 189                         $result->setIndexedTagName_internal( array( 'query', $this->getModuleName() ), $this->indexTag );
 190                 } elseif ( $params['unique'] ) {
 191                         $resultPageSet->populateFromTitles( $titles );
 192                 } else {
 193                         $resultPageSet->populateFromPageIDs( $pageids );
 194                 }
 195         }
 196
 197         public function getAllowedParams() {
 198                 return array(
 199                         'continue' => null,
 200                         'from' => null,
 201                         'to' => null,
 202                         'prefix' => null,
 203                         'unique' => false,
 204                         'prop' => array(
 205                                 ApiBase::PARAM_ISMULTI => true,
 206                                 ApiBase::PARAM_DFLT => 'title',
 207                                 ApiBase::PARAM_TYPE => array(
 208                                         'ids',
 209                                         'title'
 210                                 )
 211                         ),
 212                         'namespace' => array(
 213                                 ApiBase::PARAM_DFLT => $this->dfltNamespace,
 214                                 ApiBase::PARAM_TYPE => 'namespace'
 215                         ),
 216                         'limit' => array(
 217                                 ApiBase::PARAM_DFLT => 10,
 218                                 ApiBase::PARAM_TYPE => 'limit',
 219                                 ApiBase::PARAM_MIN => 1,
 220                                 ApiBase::PARAM_MAX => ApiBase::LIMIT_BIG1,
 221                                 ApiBase::PARAM_MAX2 => ApiBase::LIMIT_BIG2
 222                         ),
 223                         'dir' => array(
 224                                 ApiBase::PARAM_DFLT => 'ascending',
 225                                 ApiBase::PARAM_TYPE => array(
 226                                         'ascending',
 227                                         'descending'
 228                                 )
 229                         ),
 230                 );
 231         }
 232
 233         public function getParamDescription() {
 234                 $p = $this->getModulePrefix();
 235                 $link = $this->descriptionLink;
 236                 $linking = $this->descriptionLinking;
 237                 return array(
 238                         'from' => "The title of the $link to start enumerating from",
 239                         'to' => "The title of the $link to stop enumerating at",
 240                         'prefix' => "Search for all $link titles that begin with this value",
 241                         'unique' => array(
 242                                         "Only show distinct $link titles. Cannot be used with {$p}prop=ids.",
 243                                         'When used as a generator, yields target pages instead of source pages.',
 244                         ),
 245                         'prop' => array(
 246                                 'What pieces of information to include',
 247                                 " ids    - Adds the pageid of the $linking page (Cannot be used with {$p}unique)",
 248                                 " title  - Adds the title of the $link",
 249                         ),
 250                         'namespace' => 'The namespace to enumerate',
 251                         'limit' => "How many total items to return",
 252                         'continue' => 'When more results are available, use this to continue',
 253                         'dir' => 'The direction in which to list',
 254                 );
 255         }
 256
 257         public function getResultProperties() {
 258                 return array(
 259                         'ids' => array(
 260                                 'fromid' => 'integer'
 261                         ),
 262                         'title' => array(
 263                                 'ns' => 'namespace',
 264                                 'title' => 'string'
 265                         )
 266                 );
 267         }
 268
 269         public function getDescription() {
 270                 return $this->description;
 271         }
 272
 273         public function getPossibleErrors() {
 274                 $m = $this->getModuleName();
 275                 $link = $this->descriptionLink;
 276                 return array_merge( parent::getPossibleErrors(), array(
 277                         array( 'code' => 'params', 'info' => "{$m} cannot return corresponding page ids in unique {$link}s mode" ),
 278                 ) );
 279         }
 280
 281         public function getExamples() {
 282                 $p = $this->getModulePrefix();
 283                 $link = $this->descriptionLink;
 284                 $linked = $this->descriptionLinked;
 285                 return array(
 286                         "api.php?action=query&list=all{$link}s&{$p}from=B&{$p}prop=ids|title"
 287                                         => "List $linked titles with page ids they are from, including missing ones. Start at B",
 288                         "api.php?action=query&list=all{$link}s&{$p}unique=&{$p}from=B"
 289                                         => "List unique $linked titles",
 290                         "api.php?action=query&generator=all{$link}s&g{$p}unique=&g{$p}from=B"
 291                                         => "Gets all $link targets, marking the missing ones",
 292                         "api.php?action=query&generator=all{$link}s&g{$p}from=B"
 293                                         => "Gets pages containing the {$link}s",
 294                 );
 295         }
 296
 297         public function getHelpUrls() {
 298                 return "https://www.mediawiki.org/wiki/API:All{$this->descriptionLink}s";
 299         }
 300
 301         public function getVersion() {
 302                 return __CLASS__ . ': $Id$';
 303         }
 304 }