includes/specials/SpecialWhatlinkshere.php

   1 <?php
   2 /**
   3  * @todo Use some variant of Pager or something; the pagination here is lousy.
   4  *
   5  * @file
   6  * @ingroup SpecialPage
   7  */
   8
   9 /**
  10  * Entry point
  11  * @param $par String: An article name ??
  12  */
  13 function wfSpecialWhatlinkshere($par = NULL) {
  14         global $wgRequest;
  15         $page = new WhatLinksHerePage( $wgRequest, $par );
  16         $page->execute();
  17 }
  18
  19 /**
  20  * implements Special:Whatlinkshere
  21  * @ingroup SpecialPage
  22  */
  23 class WhatLinksHerePage {
  24         // Stored data
  25         protected $par;
  26
  27         // Stored objects
  28         protected $opts, $target, $selfTitle;
  29
  30         // Stored globals
  31         protected $skin, $request;
  32
  33         protected $limits = array( 20, 50, 100, 250, 500 );
  34
  35         function WhatLinksHerePage( $request, $par = null ) {
  36                 global $wgUser;
  37                 $this->request = $request;
  38                 $this->skin = $wgUser->getSkin();
  39                 $this->par = $par;
  40         }
  41
  42         function execute() {
  43                 global $wgOut;
  44
  45                 $opts = new FormOptions();
  46
  47                 $opts->add( 'target', '' );
  48                 $opts->add( 'namespace', '', FormOptions::INTNULL );
  49                 $opts->add( 'limit', 50 );
  50                 $opts->add( 'from', 0 );
  51                 $opts->add( 'back', 0 );
  52                 $opts->add( 'hideredirs', false );
  53                 $opts->add( 'hidetrans', false );
  54                 $opts->add( 'hidelinks', false );
  55                 $opts->add( 'hideimages', false );
  56
  57                 $opts->fetchValuesFromRequest( $this->request );
  58                 $opts->validateIntBounds( 'limit', 0, 5000 );
  59
  60                 // Give precedence to subpage syntax
  61                 if ( isset($this->par) ) {
  62                         $opts->setValue( 'target', $this->par );
  63                 }
  64
  65                 // Bind to member variable
  66                 $this->opts = $opts;
  67
  68                 $this->target = Title::newFromURL( $opts->getValue( 'target' ) );
  69                 if( !$this->target ) {
  70                         $wgOut->addHTML( $this->whatlinkshereForm() );
  71                         return;
  72                 }
  73
  74                 $this->selfTitle = SpecialPage::getTitleFor( 'Whatlinkshere', $this->target->getPrefixedDBkey() );
  75
  76                 $wgOut->setPageTitle( wfMsg( 'whatlinkshere-title', $this->target->getPrefixedText() ) );
  77                 $wgOut->setSubtitle( wfMsg( 'whatlinkshere-backlink', $this->skin->link( $this->target, $this->target->getPrefixedText(), array(), array( 'redirect' => 'no'  ) ) ) );
  78
  79                 $this->showIndirectLinks( 0, $this->target, $opts->getValue( 'limit' ),
  80                         $opts->getValue( 'from' ), $opts->getValue( 'back' ) );
  81         }
  82
  83         /**
  84          * @param $level  int     Recursion level
  85          * @param $target Title   Target title
  86          * @param $limit  int     Number of entries to display
  87          * @param $from   Title   Display from this article ID
  88          * @param $back   Title   Display from this article ID at backwards scrolling
  89          * @private
  90          */
  91         function showIndirectLinks( $level, $target, $limit, $from = 0, $back = 0 ) {
  92                 global $wgOut, $wgMaxRedirectLinksRetrieved;
  93                 $dbr = wfGetDB( DB_SLAVE );
  94                 $options = array();
  95
  96                 $hidelinks = $this->opts->getValue( 'hidelinks' );
  97                 $hideredirs = $this->opts->getValue( 'hideredirs' );
  98                 $hidetrans = $this->opts->getValue( 'hidetrans' );
  99                 $hideimages = $target->getNamespace() != NS_FILE || $this->opts->getValue( 'hideimages' );
 100
 101                 $fetchlinks = (!$hidelinks || !$hideredirs);
 102
 103                 // Make the query
 104                 $plConds = array(
 105                         'page_id=pl_from',
 106                         'pl_namespace' => $target->getNamespace(),
 107                         'pl_title' => $target->getDBkey(),
 108                 );
 109                 if( $hideredirs ) {
 110                         $plConds['page_is_redirect'] = 0;
 111                 } elseif( $hidelinks ) {
 112                         $plConds['page_is_redirect'] = 1;
 113                 }
 114
 115                 $tlConds = array(
 116                         'page_id=tl_from',
 117                         'tl_namespace' => $target->getNamespace(),
 118                         'tl_title' => $target->getDBkey(),
 119                 );
 120
 121                 $ilConds = array(
 122                         'page_id=il_from',
 123                         'il_to' => $target->getDBkey(),
 124                 );
 125
 126                 $namespace = $this->opts->getValue( 'namespace' );
 127                 if ( is_int($namespace) ) {
 128                         $plConds['page_namespace'] = $namespace;
 129                         $tlConds['page_namespace'] = $namespace;
 130                         $ilConds['page_namespace'] = $namespace;
 131                 }
 132
 133                 if ( $from ) {
 134                         $tlConds[] = "tl_from >= $from";
 135                         $plConds[] = "pl_from >= $from";
 136                         $ilConds[] = "il_from >= $from";
 137                 }
 138
 139                 // Read an extra row as an at-end check
 140                 $queryLimit = $limit + 1;
 141
 142                 // Enforce join order, sometimes namespace selector may
 143                 // trigger filesorts which are far less efficient than scanning many entries
 144                 $options[] = 'STRAIGHT_JOIN';
 145
 146                 $options['LIMIT'] = $queryLimit;
 147                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' );
 148
 149                 if( $fetchlinks ) {
 150                         $options['ORDER BY'] = 'pl_from';
 151                         $plRes = $dbr->select( array( 'pagelinks', 'page' ), $fields,
 152                                 $plConds, __METHOD__, $options );
 153                 }
 154
 155                 if( !$hidetrans ) {
 156                         $options['ORDER BY'] = 'tl_from';
 157                         $tlRes = $dbr->select( array( 'templatelinks', 'page' ), $fields,
 158                                 $tlConds, __METHOD__, $options );
 159                 }
 160
 161                 if( !$hideimages ) {
 162                         $options['ORDER BY'] = 'il_from';
 163                         $ilRes = $dbr->select( array( 'imagelinks', 'page' ), $fields,
 164                                 $ilConds, __METHOD__, $options );
 165                 }
 166
 167                 if( ( !$fetchlinks || !$dbr->numRows($plRes) ) && ( $hidetrans || !$dbr->numRows($tlRes) ) && ( $hideimages || !$dbr->numRows($ilRes) ) ) {
 168                         if ( 0 == $level ) {
 169                                 $wgOut->addHTML( $this->whatlinkshereForm() );
 170
 171                                 // Show filters only if there are links
 172                                 if( $hidelinks || $hidetrans || $hideredirs || $hideimages )
 173                                         $wgOut->addHTML( $this->getFilterPanel() );
 174
 175                                 $errMsg = is_int($namespace) ? 'nolinkshere-ns' : 'nolinkshere';
 176                                 $wgOut->addWikiMsg( $errMsg, $this->target->getPrefixedText() );
 177                         }
 178                         return;
 179                 }
 180
 181                 // Read the rows into an array and remove duplicates
 182                 // templatelinks comes second so that the templatelinks row overwrites the
 183                 // pagelinks row, so we get (inclusion) rather than nothing
 184                 if( $fetchlinks ) {
 185                         while ( $row = $dbr->fetchObject( $plRes ) ) {
 186                                 $row->is_template = 0;
 187                                 $row->is_image = 0;
 188                                 $rows[$row->page_id] = $row;
 189                         }
 190                         $dbr->freeResult( $plRes );
 191
 192                 }
 193                 if( !$hidetrans ) {
 194                         while ( $row = $dbr->fetchObject( $tlRes ) ) {
 195                                 $row->is_template = 1;
 196                                 $row->is_image = 0;
 197                                 $rows[$row->page_id] = $row;
 198                         }
 199                         $dbr->freeResult( $tlRes );
 200                 }
 201                 if( !$hideimages ) {
 202                         while ( $row = $dbr->fetchObject( $ilRes ) ) {
 203                                 $row->is_template = 0;
 204                                 $row->is_image = 1;
 205                                 $rows[$row->page_id] = $row;
 206                         }
 207                         $dbr->freeResult( $ilRes );
 208                 }
 209
 210                 // Sort by key and then change the keys to 0-based indices
 211                 ksort( $rows );
 212                 $rows = array_values( $rows );
 213
 214                 $numRows = count( $rows );
 215
 216                 // Work out the start and end IDs, for prev/next links
 217                 if ( $numRows > $limit ) {
 218                         // More rows available after these ones
 219                         // Get the ID from the last row in the result set
 220                         $nextId = $rows[$limit]->page_id;
 221                         // Remove undisplayed rows
 222                         $rows = array_slice( $rows, 0, $limit );
 223                 } else {
 224                         // No more rows after
 225                         $nextId = false;
 226                 }
 227                 $prevId = $from;
 228
 229                 if ( $level == 0 ) {
 230                         $wgOut->addHTML( $this->whatlinkshereForm() );
 231                         $wgOut->addHTML( $this->getFilterPanel() );
 232                         $wgOut->addWikiMsg( 'linkshere', $this->target->getPrefixedText() );
 233
 234                         $prevnext = $this->getPrevNext( $prevId, $nextId );
 235                         $wgOut->addHTML( $prevnext );
 236                 }
 237
 238                 $wgOut->addHTML( $this->listStart() );
 239                 foreach ( $rows as $row ) {
 240                         $nt = Title::makeTitle( $row->page_namespace, $row->page_title );
 241
 242                         if ( $row->page_is_redirect && $level < 2 ) {
 243                                 $wgOut->addHTML( $this->listItem( $row, $nt, true ) );
 244                                 $this->showIndirectLinks( $level + 1, $nt, $wgMaxRedirectLinksRetrieved );
 245                                 $wgOut->addHTML( Xml::closeElement( 'li' ) );
 246                         } else {
 247                                 $wgOut->addHTML( $this->listItem( $row, $nt ) );
 248                         }
 249                 }
 250
 251                 $wgOut->addHTML( $this->listEnd() );
 252
 253                 if( $level == 0 ) {
 254                         $wgOut->addHTML( $prevnext );
 255                 }
 256         }
 257
 258         protected function listStart() {
 259                 return Xml::openElement( 'ul', array ( 'id' => 'mw-whatlinkshere-list' ) );
 260         }
 261
 262         protected function listItem( $row, $nt, $notClose = false ) {
 263                 # local message cache
 264                 static $msgcache = null;
 265                 if ( $msgcache === null ) {
 266                         static $msgs = array( 'isredirect', 'istemplate', 'semicolon-separator',
 267                                 'whatlinkshere-links', 'isimage' );
 268                         $msgcache = array();
 269                         foreach ( $msgs as $msg ) {
 270                                 $msgcache[$msg] = wfMsgExt( $msg, array( 'escapenoentities' ) );
 271                         }
 272                 }
 273
 274                 $suppressRedirect = $row->page_is_redirect ? 'redirect=no' : '';
 275                 $link = $this->skin->makeKnownLinkObj( $nt, '', $suppressRedirect );
 276
 277                 // Display properties (redirect or template)
 278                 $propsText = '';
 279                 $props = array();
 280                 if ( $row->page_is_redirect )
 281                         $props[] = $msgcache['isredirect'];
 282                 if ( $row->is_template )
 283                         $props[] = $msgcache['istemplate'];
 284                 if( $row->is_image )
 285                         $props[] = $msgcache['isimage'];
 286
 287                 if ( count( $props ) ) {
 288                         $propsText = '(' . implode( $msgcache['semicolon-separator'], $props ) . ')';
 289                 }
 290
 291                 # Space for utilities links, with a what-links-here link provided
 292                 $wlhLink = $this->wlhLink( $nt, $msgcache['whatlinkshere-links'] );
 293                 $wlh = Xml::wrapClass( "($wlhLink)", 'mw-whatlinkshere-tools' );
 294
 295                 return $notClose ?
 296                         Xml::openElement( 'li' ) . "$link $propsText $wlh\n" :
 297                         Xml::tags( 'li', null, "$link $propsText $wlh" ) . "\n";
 298         }
 299
 300         protected function listEnd() {
 301                 return Xml::closeElement( 'ul' );
 302         }
 303
 304         protected function wlhLink( Title $target, $text ) {
 305                 static $title = null;
 306                 if ( $title === null )
 307                         $title = SpecialPage::getTitleFor( 'Whatlinkshere' );
 308
 309                 $targetText = $target->getPrefixedUrl();
 310                 return $this->skin->makeKnownLinkObj( $title, $text, 'target=' . $targetText );
 311         }
 312
 313         function makeSelfLink( $text, $query ) {
 314                 return $this->skin->makeKnownLinkObj( $this->selfTitle, $text, $query );
 315         }
 316
 317         function getPrevNext( $prevId, $nextId ) {
 318                 global $wgLang;
 319                 $currentLimit = $this->opts->getValue( 'limit' );
 320                 $fmtLimit = $wgLang->formatNum( $currentLimit );
 321                 $prev = wfMsgExt( 'whatlinkshere-prev', array( 'parsemag', 'escape' ), $fmtLimit );
 322                 $next = wfMsgExt( 'whatlinkshere-next', array( 'parsemag', 'escape' ), $fmtLimit );
 323
 324                 $changed = $this->opts->getChangedValues();
 325                 unset($changed['target']); // Already in the request title
 326
 327                 if ( 0 != $prevId ) {
 328                         $overrides = array( 'from' => $this->opts->getValue( 'back' ) );
 329                         $prev = $this->makeSelfLink( $prev, wfArrayToCGI( $overrides, $changed ) );
 330                 }
 331                 if ( 0 != $nextId ) {
 332                         $overrides = array( 'from' => $nextId, 'back' => $prevId );
 333                         $next = $this->makeSelfLink( $next, wfArrayToCGI( $overrides, $changed ) );
 334                 }
 335
 336                 $limitLinks = array();
 337                 foreach ( $this->limits as $limit ) {
 338                         $prettyLimit = $wgLang->formatNum( $limit );
 339                         $overrides = array( 'limit' => $limit );
 340                         $limitLinks[] = $this->makeSelfLink( $prettyLimit, wfArrayToCGI( $overrides, $changed ) );
 341                 }
 342
 343                 $nums = $wgLang->pipeList( $limitLinks );
 344
 345                 return wfMsgHtml( 'viewprevnext', $prev, $next, $nums );
 346         }
 347
 348         function whatlinkshereForm() {
 349                 global $wgScript;
 350
 351                 // We get nicer value from the title object
 352                 $this->opts->consumeValue( 'target' );
 353                 // Reset these for new requests
 354                 $this->opts->consumeValues( array( 'back', 'from' ) );
 355
 356                 $target = $this->target ? $this->target->getPrefixedText() : '';
 357                 $namespace = $this->opts->consumeValue( 'namespace' );
 358
 359                 # Build up the form
 360                 $f = Xml::openElement( 'form', array( 'action' => $wgScript ) );
 361
 362                 # Values that should not be forgotten
 363                 $f .= Xml::hidden( 'title', SpecialPage::getTitleFor( 'Whatlinkshere' )->getPrefixedText() );
 364                 foreach ( $this->opts->getUnconsumedValues() as $name => $value ) {
 365                         $f .= Xml::hidden( $name, $value );
 366                 }
 367
 368                 $f .= Xml::fieldset( wfMsg( 'whatlinkshere' ) );
 369
 370                 # Target input
 371                 $f .= Xml::inputLabel( wfMsg( 'whatlinkshere-page' ), 'target',
 372                                 'mw-whatlinkshere-target', 40, $target );
 373
 374                 $f .= ' ';
 375
 376                 # Namespace selector
 377                 $f .= Xml::label( wfMsg( 'namespace' ), 'namespace' ) . '&nbsp;' .
 378                         Xml::namespaceSelector( $namespace, '' );
 379
 380                 $f .= ' ';
 381
 382                 # Submit
 383                 $f .= Xml::submitButton( wfMsg( 'allpagessubmit' ) );
 384
 385                 # Close
 386                 $f .= Xml::closeElement( 'fieldset' ) . Xml::closeElement( 'form' ) . "\n";
 387
 388                 return $f;
 389         }
 390
 391         function getFilterPanel() {
 392                 global $wgLang;
 393                 $show = wfMsgHtml( 'show' );
 394                 $hide = wfMsgHtml( 'hide' );
 395
 396                 $changed = $this->opts->getChangedValues();
 397                 unset($changed['target']); // Already in the request title
 398
 399                 $links = array();
 400                 $types = array( 'hidetrans', 'hidelinks', 'hideredirs' );
 401                 if( $this->target->getNamespace() == NS_FILE )
 402                         $types[] = 'hideimages';
 403                 foreach( $types as $type ) {
 404                         $chosen = $this->opts->getValue( $type );
 405                         $msg = wfMsgHtml( "whatlinkshere-{$type}", $chosen ? $show : $hide );
 406                         $overrides = array( $type => !$chosen );
 407                         $links[] = $this->makeSelfLink( $msg, wfArrayToCGI( $overrides, $changed ) );
 408                 }
 409                 return Xml::fieldset( wfMsg( 'whatlinkshere-filters' ), $wgLang->pipeList( $links ) );
 410         }
 411 }