includes/SpecialWhatlinkshere.php

   1 <?php
   2 /**
   3  *
   4  * @addtogroup SpecialPage
   5  */
   6
   7 /**
   8  * Entry point
   9  * @param string $par An article name ??
  10  */
  11 function wfSpecialWhatlinkshere($par = NULL) {
  12         global $wgRequest;
  13         $page = new WhatLinksHerePage( $wgRequest, $par );
  14         $page->execute();
  15 }
  16
  17 /**
  18  * implements Special:Whatlinkshere
  19  * @addtogroup SpecialPage
  20  */
  21 class WhatLinksHerePage {
  22         var $request, $par;
  23         var $limit, $from, $back, $target;
  24         var $selfTitle, $skin;
  25
  26         private $namespace;
  27
  28         function WhatLinksHerePage( &$request, $par = null ) {
  29                 global $wgUser;
  30                 $this->request =& $request;
  31                 $this->skin = $wgUser->getSkin();
  32                 $this->par = $par;
  33         }
  34
  35         function execute() {
  36                 global $wgOut;
  37
  38                 $this->limit = min( $this->request->getInt( 'limit', 50 ), 5000 );
  39                 if ( $this->limit <= 0 ) {
  40                         $this->limit = 50;
  41                 }
  42                 $this->from = $this->request->getInt( 'from' );
  43                 $this->back = $this->request->getInt( 'back' );
  44
  45                 $targetString = isset($this->par) ? $this->par : $this->request->getVal( 'target' );
  46
  47                 if (is_null($targetString)) {
  48                         $wgOut->showErrorPage( 'notargettitle', 'notargettext' );
  49                         return;
  50                 }
  51
  52                 $this->target = Title::newFromURL( $targetString );
  53                 if( !$this->target ) {
  54                         $wgOut->showErrorPage( 'notargettitle', 'notargettext' );
  55                         return;
  56                 }
  57                 $this->selfTitle = Title::makeTitleSafe( NS_SPECIAL,
  58                         'Whatlinkshere/' . $this->target->getPrefixedDBkey() );
  59
  60                 $wgOut->setPageTitle( wfMsg( 'whatlinkshere-title', $this->target->getPrefixedText() ) );
  61                 $wgOut->setSubtitle( wfMsg( 'linklistsub' ) );
  62
  63                 $wgOut->addHTML( wfMsg( 'whatlinkshere-barrow' ) . ' '  .$this->skin->makeLinkObj($this->target, '', 'redirect=no' )."<br />\n");
  64
  65                 $this->showIndirectLinks( 0, $this->target, $this->limit, $this->from, $this->back );
  66         }
  67
  68         /**
  69          * @param int       $level      Recursion level
  70          * @param Title     $target     Target title
  71          * @param int       $limit      Number of entries to display
  72          * @param Title     $from       Display from this article ID
  73          * @param Title     $back       Display from this article ID at backwards scrolling
  74          * @private
  75          */
  76         function showIndirectLinks( $level, $target, $limit, $from = 0, $back = 0 ) {
  77                 global $wgOut;
  78                 $fname = 'WhatLinksHerePage::showIndirectLinks';
  79                 $dbr = wfGetDB( DB_READ );
  80                 $options = array();
  81
  82                 $ns = $this->request->getIntOrNull( 'namespace' );
  83                 if ( isset( $ns ) ) {
  84                         $options['namespace'] = $ns;
  85                         $this->setNamespace( $options['namespace'] );
  86                 } else {
  87                         $options['namespace'] = '';
  88                 }
  89
  90                 // Make the query
  91                 $plConds = array(
  92                         'page_id=pl_from',
  93                         'pl_namespace' => $target->getNamespace(),
  94                         'pl_title' => $target->getDBkey(),
  95                 );
  96
  97                 $tlConds = array(
  98                         'page_id=tl_from',
  99                         'tl_namespace' => $target->getNamespace(),
 100                         'tl_title' => $target->getDBkey(),
 101                 );
 102
 103                 if ( $this->namespace !== null ){
 104                         $plConds['page_namespace'] = (int)$this->namespace;
 105                         $tlConds['page_namespace'] = (int)$this->namespace;
 106                 }
 107
 108                 if ( $from ) {
 109                         $from = (int)$from; // just in case
 110                         $tlConds[] = "tl_from >= $from";
 111                         $plConds[] = "pl_from >= $from";
 112                 }
 113
 114                 // Read an extra row as an at-end check
 115                 $queryLimit = $limit + 1;
 116
 117                 // enforce join order, sometimes namespace selector may
 118                 // trigger filesorts which are far less efficient than scanning many entries
 119                 $options[] = 'STRAIGHT_JOIN';
 120
 121                 $options['LIMIT'] = $queryLimit;
 122                 $fields = array( 'page_id', 'page_namespace', 'page_title', 'page_is_redirect' );
 123
 124                 $options['ORDER BY'] = 'pl_from';
 125                 $plRes = $dbr->select( array( 'pagelinks', 'page' ), $fields,
 126                         $plConds, $fname, $options );
 127
 128                 $options['ORDER BY'] = 'tl_from';
 129                 $tlRes = $dbr->select( array( 'templatelinks', 'page' ), $fields,
 130                         $tlConds, $fname, $options );
 131
 132                 if ( !$dbr->numRows( $plRes ) && !$dbr->numRows( $tlRes ) ) {
 133                         if ( 0 == $level && !isset( $this->namespace ) ) {
 134                                 // really no links to here
 135                                 $wgOut->addWikiText( wfMsg( 'nolinkshere', $this->target->getPrefixedText() ) );
 136                         } elseif ( 0 == $level && isset( $this->namespace ) ) {
 137                                 // no links from requested namespace to here
 138                                 $options = array(); // reinitialize for a further namespace search
 139                                 $options['namespace'] = $this->namespace;
 140                                 $options['target'] = $this->target->getPrefixedText();
 141                                 list( $options['limit'], $options['offset']) = wfCheckLimits();
 142                                 $wgOut->addHTML( $this->whatlinkshereForm( $options ) );
 143                                 $wgOut->addWikiText( wfMsg( 'nolinkshere-ns', $this->target->getPrefixedText() ) );
 144                         }
 145                         return;
 146                 }
 147
 148                 $options = array();
 149                 list( $options['limit'], $options['offset']) = wfCheckLimits();
 150                 if ( ( $ns = $this->request->getVal( 'namespace', null ) ) !== null && $ns !== '' && ctype_digit($ns) ) {
 151                         $options['namespace'] = intval( $ns );
 152                         $this->setNamespace( $options['namespace'] );
 153                 } else {
 154                         $options['namespace'] = '';
 155                         $this->setNamespace( null );
 156                 }
 157                 $options['offset'] = $this->request->getVal( 'offset' );
 158                 /* Offset must be an integral. */
 159                 if ( !strlen( $options['offset'] ) || !preg_match( '/^[0-9]+$/', $options['offset'] ) )
 160                 $options['offset'] = '';
 161                 $options['target'] = $this->target->getPrefixedDBkey();
 162
 163                 // Read the rows into an array and remove duplicates
 164                 // templatelinks comes second so that the templatelinks row overwrites the
 165                 // pagelinks row, so we get (inclusion) rather than nothing
 166                 while ( $row = $dbr->fetchObject( $plRes ) ) {
 167                         $row->is_template = 0;
 168                         $rows[$row->page_id] = $row;
 169                 }
 170                 $dbr->freeResult( $plRes );
 171                 while ( $row = $dbr->fetchObject( $tlRes ) ) {
 172                         $row->is_template = 1;
 173                         $rows[$row->page_id] = $row;
 174                 }
 175                 $dbr->freeResult( $tlRes );
 176
 177                 // Sort by key and then change the keys to 0-based indices
 178                 ksort( $rows );
 179                 $rows = array_values( $rows );
 180
 181                 $numRows = count( $rows );
 182
 183                 // Work out the start and end IDs, for prev/next links
 184                 if ( $numRows > $limit ) {
 185                         // More rows available after these ones
 186                         // Get the ID from the last row in the result set
 187                         $nextId = $rows[$limit]->page_id;
 188                         // Remove undisplayed rows
 189                         $rows = array_slice( $rows, 0, $limit );
 190                 } else {
 191                         // No more rows after
 192                         $nextId = false;
 193                 }
 194                 $prevId = $from;
 195
 196                 if ( $level == 0 ) {
 197                         $wgOut->addHTML( $this->whatlinkshereForm( $options ) );
 198                         $wgOut->addWikiText( wfMsg( 'linkshere', $this->target->getPrefixedText() ) );
 199                 }
 200                 $isredir = wfMsg( 'isredirect' );
 201                 $istemplate = wfMsg( 'istemplate' );
 202
 203                 if( $level == 0 ) {
 204                         $prevnext = $this->getPrevNext( $limit, $prevId, $nextId, $options['namespace'] );
 205                         $wgOut->addHTML( $prevnext );
 206                 }
 207
 208                 $wgOut->addHTML( '<ul>' );
 209                 foreach ( $rows as $row ) {
 210                         $nt = Title::makeTitle( $row->page_namespace, $row->page_title );
 211
 212                         if ( $row->page_is_redirect ) {
 213                                 $extra = 'redirect=no';
 214                         } else {
 215                                 $extra = '';
 216                         }
 217
 218                         $link = $this->skin->makeKnownLinkObj( $nt, '', $extra );
 219                         $wgOut->addHTML( '<li>'.$link );
 220
 221                         // Display properties (redirect or template)
 222                         $props = array();
 223                         if ( $row->page_is_redirect ) {
 224                                 $props[] = $isredir;
 225                         }
 226                         if ( $row->is_template ) {
 227                                 $props[] = $istemplate;
 228                         }
 229                         if ( count( $props ) ) {
 230                                 // FIXME? Cultural assumption, hard-coded punctuation
 231                                 $wgOut->addHTML( ' (' . implode( ', ', $props ) . ') ' );
 232                         }
 233
 234                         # Space for utilities links, with a what-links-here link provided
 235                         $wlh = $this->skin->makeKnownLinkObj(
 236                                 SpecialPage::getTitleFor( 'Whatlinkshere' ),
 237                                 wfMsgHtml( 'whatlinkshere-links' ),
 238                                 'target=' . $nt->getPrefixedUrl()
 239                         );
 240                         $wgOut->addHtml( ' <span class="mw-whatlinkshere-tools">(' . $wlh . ')</span>' );
 241
 242                         if ( $row->page_is_redirect ) {
 243                                 if ( $level < 2 ) {
 244                                         $this->showIndirectLinks( $level + 1, $nt, 500 );
 245                                 }
 246                         }
 247                         $wgOut->addHTML( "</li>\n" );
 248                 }
 249                 $wgOut->addHTML( "</ul>\n" );
 250
 251                 if( $level == 0 ) {
 252                         $wgOut->addHTML( $prevnext );
 253                 }
 254         }
 255
 256         function makeSelfLink( $text, $query ) {
 257                 return $this->skin->makeKnownLinkObj( $this->selfTitle, $text, $query );
 258         }
 259
 260         function getPrevNext( $limit, $prevId, $nextId ) {
 261                 global $wgLang;
 262                 $fmtLimit = $wgLang->formatNum( $limit );
 263                 $prev = wfMsgExt( 'whatlinkshere-prev', array( 'parsemag', 'escape' ), $fmtLimit );
 264                 $next = wfMsgExt( 'whatlinkshere-next', array( 'parsemag', 'escape' ), $fmtLimit );
 265
 266                 $nsText = '';
 267                 if( is_int($this->namespace) ) {
 268                         $nsText = "&namespace={$this->namespace}";
 269                 }
 270
 271                 if ( 0 != $prevId ) {
 272                         $prevLink = $this->makeSelfLink( $prev, "limit={$limit}&from={$this->back}{$nsText}" );
 273                 } else {
 274                         $prevLink = $prev;
 275                 }
 276                 if ( 0 != $nextId ) {
 277                         $nextLink = $this->makeSelfLink( $next, "limit={$limit}&from={$nextId}&back={$prevId}{$nsText}" );
 278                 } else {
 279                         $nextLink = $next;
 280                 }
 281                 $nums = $this->numLink( 20, $prevId ) . ' | ' .
 282                   $this->numLink( 50, $prevId ) . ' | ' .
 283                   $this->numLink( 100, $prevId ) . ' | ' .
 284                   $this->numLink( 250, $prevId ) . ' | ' .
 285                   $this->numLink( 500, $prevId );
 286
 287                 return wfMsg( 'viewprevnext', $prevLink, $nextLink, $nums );
 288         }
 289
 290         function numLink( $limit, $from, $ns = null ) {
 291                 global $wgLang;
 292                 $query = "limit={$limit}&from={$from}";
 293                 if( is_int($this->namespace) ) { $query .= "&namespace={$this->namespace}";}
 294                 $fmtLimit = $wgLang->formatNum( $limit );
 295                 return $this->makeSelfLink( $fmtLimit, $query );
 296         }
 297
 298         function whatlinkshereForm( $options ) {
 299                 global $wgScript, $wgTitle;
 300
 301                 $options['title'] = $wgTitle->getPrefixedText();
 302
 303                 $f = Xml::openElement( 'form', array( 'method' => 'get', 'action' => "$wgScript" ) ) .
 304                         '<fieldset>' .
 305                         Xml::element( 'legend', array(), wfMsg( 'whatlinkshere' ) );
 306
 307                 foreach ( $options as $name => $value ) {
 308                         if( $name === 'namespace') continue;
 309                         $f .= "\t" . Xml::hidden( $name, $value ). "\n";
 310                 }
 311
 312                 $f .= Xml::label( wfMsg( 'namespace' ), 'namespace' ) . ' ' .
 313                         Xml::namespaceSelector( $options['namespace'], '' ) .
 314                         Xml::submitButton( wfMsg( 'allpagessubmit' ) ) .
 315                         '</fieldset>' .
 316                         Xml::closeElement( 'form' ) . "\n";
 317
 318                 return $f;
 319         }
 320
 321         /** Set the namespace we are filtering on */
 322         private function setNamespace( $ns ) {
 323                 $this->namespace = $ns;
 324         }
 325
 326 }
 327
 328