includes/Linker.php

   1 <?php
   2 /**
   3  * Methods to make links and related items.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  */
  22
  23 /**
  24  * Some internal bits split of from Skin.php. These functions are used
  25  * for primarily page content: links, embedded images, table of contents. Links
  26  * are also used in the skin.
  27  *
  28  * @todo turn this into a legacy interface for HtmlPageLinkRenderer and similar services.
  29  *
  30  * @ingroup Skins
  31  */
  32 class Linker {
  33         /**
  34          * Flags for userToolLinks()
  35          */
  36         const TOOL_LINKS_NOBLOCK = 1;
  37         const TOOL_LINKS_EMAIL = 2;
  38
  39         /**
  40          * Get the appropriate HTML attributes to add to the "a" element of an
  41          * external link, as created by [wikisyntax].
  42          *
  43          * @param string $class The contents of the class attribute; if an empty
  44          *   string is passed, which is the default value, defaults to 'external'.
  45          * @return string
  46          * @deprecated since 1.18 Just pass the external class directly to something
  47          *   using Html::expandAttributes.
  48          */
  49         static function getExternalLinkAttributes( $class = 'external' ) {
  50                 wfDeprecated( __METHOD__, '1.18' );
  51                 return self::getLinkAttributesInternal( '', $class );
  52         }
  53
  54         /**
  55          * Get the appropriate HTML attributes to add to the "a" element of an interwiki link.
  56          *
  57          * @param string $title The title text for the link, URL-encoded (???) but
  58          *   not HTML-escaped
  59          * @param string $unused Unused
  60          * @param string $class The contents of the class attribute; if an empty
  61          *   string is passed, which is the default value, defaults to 'external'.
  62          * @return string
  63          */
  64         static function getInterwikiLinkAttributes( $title, $unused = null, $class = 'external' ) {
  65                 global $wgContLang;
  66
  67                 # @todo FIXME: We have a whole bunch of handling here that doesn't happen in
  68                 # getExternalLinkAttributes, why?
  69                 $title = urldecode( $title );
  70                 $title = $wgContLang->checkTitleEncoding( $title );
  71                 $title = preg_replace( '/[\\x00-\\x1f]/', ' ', $title );
  72
  73                 return self::getLinkAttributesInternal( $title, $class );
  74         }
  75
  76         /**
  77          * Get the appropriate HTML attributes to add to the "a" element of an internal link.
  78          *
  79          * @param string $title The title text for the link, URL-encoded (???) but
  80          *   not HTML-escaped
  81          * @param string $unused Unused
  82          * @param string $class The contents of the class attribute, default none
  83          * @return string
  84          */
  85         static function getInternalLinkAttributes( $title, $unused = null, $class = '' ) {
  86                 $title = urldecode( $title );
  87                 $title = str_replace( '_', ' ', $title );
  88                 return self::getLinkAttributesInternal( $title, $class );
  89         }
  90
  91         /**
  92          * Get the appropriate HTML attributes to add to the "a" element of an internal
  93          * link, given the Title object for the page we want to link to.
  94          *
  95          * @param Title $nt
  96          * @param string $unused Unused
  97          * @param string $class The contents of the class attribute, default none
  98          * @param string|bool $title Optional (unescaped) string to use in the title
  99          *   attribute; if false, default to the name of the page we're linking to
 100          * @return string
 101          */
 102         static function getInternalLinkAttributesObj( $nt, $unused = null, $class = '', $title = false ) {
 103                 if ( $title === false ) {
 104                         $title = $nt->getPrefixedText();
 105                 }
 106                 return self::getLinkAttributesInternal( $title, $class );
 107         }
 108
 109         /**
 110          * Common code for getLinkAttributesX functions
 111          *
 112          * @param string $title
 113          * @param string $class
 114          *
 115          * @return string
 116          */
 117         private static function getLinkAttributesInternal( $title, $class ) {
 118                 $title = htmlspecialchars( $title );
 119                 $class = htmlspecialchars( $class );
 120                 $r = '';
 121                 if ( $class != '' ) {
 122                         $r .= " class=\"$class\"";
 123                 }
 124                 if ( $title != '' ) {
 125                         $r .= " title=\"$title\"";
 126                 }
 127                 return $r;
 128         }
 129
 130         /**
 131          * Return the CSS colour of a known link
 132          *
 133          * @param Title $t
 134          * @param int $threshold User defined threshold
 135          * @return string CSS class
 136          */
 137         public static function getLinkColour( $t, $threshold ) {
 138                 $colour = '';
 139                 if ( $t->isRedirect() ) {
 140                         # Page is a redirect
 141                         $colour = 'mw-redirect';
 142                 } elseif ( $threshold > 0 && $t->isContentPage() &&
 143                         $t->exists() && $t->getLength() < $threshold
 144                 ) {
 145                         # Page is a stub
 146                         $colour = 'stub';
 147                 }
 148                 return $colour;
 149         }
 150
 151         /**
 152          * This function returns an HTML link to the given target.  It serves a few
 153          * purposes:
 154          *   1) If $target is a Title, the correct URL to link to will be figured
 155          *      out automatically.
 156          *   2) It automatically adds the usual classes for various types of link
 157          *      targets: "new" for red links, "stub" for short articles, etc.
 158          *   3) It escapes all attribute values safely so there's no risk of XSS.
 159          *   4) It provides a default tooltip if the target is a Title (the page
 160          *      name of the target).
 161          * link() replaces the old functions in the makeLink() family.
 162          *
 163          * @since 1.18 Method exists since 1.16 as non-static, made static in 1.18.
 164          *
 165          * @param Title $target Can currently only be a Title, but this may
 166          *   change to support Images, literal URLs, etc.
 167          * @param string $html The HTML contents of the <a> element, i.e.,
 168          *   the link text.  This is raw HTML and will not be escaped.  If null,
 169          *   defaults to the prefixed text of the Title; or if the Title is just a
 170          *   fragment, the contents of the fragment.
 171          * @param array $customAttribs A key => value array of extra HTML attributes,
 172          *   such as title and class.  (href is ignored.)  Classes will be
 173          *   merged with the default classes, while other attributes will replace
 174          *   default attributes.  All passed attribute values will be HTML-escaped.
 175          *   A false attribute value means to suppress that attribute.
 176          * @param array $query The query string to append to the URL
 177          *   you're linking to, in key => value array form.  Query keys and values
 178          *   will be URL-encoded.
 179          * @param string|array $options String or array of strings:
 180          *     'known': Page is known to exist, so don't check if it does.
 181          *     'broken': Page is known not to exist, so don't check if it does.
 182          *     'noclasses': Don't add any classes automatically (includes "new",
 183          *       "stub", "mw-redirect", "extiw").  Only use the class attribute
 184          *       provided, if any, so you get a simple blue link with no funny i-
 185          *       cons.
 186          *     'forcearticlepath': Use the article path always, even with a querystring.
 187          *       Has compatibility issues on some setups, so avoid wherever possible.
 188          *     'http': Force a full URL with http:// as the scheme.
 189          *     'https': Force a full URL with https:// as the scheme.
 190          * @return string HTML <a> attribute
 191          */
 192         public static function link(
 193                 $target, $html = null, $customAttribs = array(), $query = array(), $options = array()
 194         ) {
 195                 wfProfileIn( __METHOD__ );
 196                 if ( !$target instanceof Title ) {
 197                         wfProfileOut( __METHOD__ );
 198                         return "<!-- ERROR -->$html";
 199                 }
 200
 201                 if ( is_string( $query ) ) {
 202                         // some functions withing core using this still hand over query strings
 203                         wfDeprecated( __METHOD__ . ' with parameter $query as string (should be array)', '1.20' );
 204                         $query = wfCgiToArray( $query );
 205                 }
 206                 $options = (array)$options;
 207
 208                 $dummy = new DummyLinker; // dummy linker instance for bc on the hooks
 209
 210                 $ret = null;
 211                 if ( !wfRunHooks( 'LinkBegin', array( $dummy, $target, &$html,
 212                 &$customAttribs, &$query, &$options, &$ret ) ) ) {
 213                         wfProfileOut( __METHOD__ );
 214                         return $ret;
 215                 }
 216
 217                 # Normalize the Title if it's a special page
 218                 $target = self::normaliseSpecialPage( $target );
 219
 220                 # If we don't know whether the page exists, let's find out.
 221                 wfProfileIn( __METHOD__ . '-checkPageExistence' );
 222                 if ( !in_array( 'known', $options ) and !in_array( 'broken', $options ) ) {
 223                         if ( $target->isKnown() ) {
 224                                 $options[] = 'known';
 225                         } else {
 226                                 $options[] = 'broken';
 227                         }
 228                 }
 229                 wfProfileOut( __METHOD__ . '-checkPageExistence' );
 230
 231                 $oldquery = array();
 232                 if ( in_array( "forcearticlepath", $options ) && $query ) {
 233                         $oldquery = $query;
 234                         $query = array();
 235                 }
 236
 237                 # Note: we want the href attribute first, for prettiness.
 238                 $attribs = array( 'href' => self::linkUrl( $target, $query, $options ) );
 239                 if ( in_array( 'forcearticlepath', $options ) && $oldquery ) {
 240                         $attribs['href'] = wfAppendQuery( $attribs['href'], $oldquery );
 241                 }
 242
 243                 $attribs = array_merge(
 244                         $attribs,
 245                         self::linkAttribs( $target, $customAttribs, $options )
 246                 );
 247                 if ( is_null( $html ) ) {
 248                         $html = self::linkText( $target );
 249                 }
 250
 251                 $ret = null;
 252                 if ( wfRunHooks( 'LinkEnd', array( $dummy, $target, $options, &$html, &$attribs, &$ret ) ) ) {
 253                         $ret = Html::rawElement( 'a', $attribs, $html );
 254                 }
 255
 256                 wfProfileOut( __METHOD__ );
 257                 return $ret;
 258         }
 259
 260         /**
 261          * Identical to link(), except $options defaults to 'known'.
 262          * @return string
 263          */
 264         public static function linkKnown(
 265                 $target, $html = null, $customAttribs = array(),
 266                 $query = array(), $options = array( 'known', 'noclasses' )
 267         ) {
 268                 return self::link( $target, $html, $customAttribs, $query, $options );
 269         }
 270
 271         /**
 272          * Returns the Url used to link to a Title
 273          *
 274          * @param Title $target
 275          * @param array $query Query parameters
 276          * @param array $options
 277          * @return string
 278          */
 279         private static function linkUrl( $target, $query, $options ) {
 280                 wfProfileIn( __METHOD__ );
 281                 # We don't want to include fragments for broken links, because they
 282                 # generally make no sense.
 283                 if ( in_array( 'broken', $options ) && $target->hasFragment() ) {
 284                         $target = clone $target;
 285                         $target->setFragment( '' );
 286                 }
 287
 288                 # If it's a broken link, add the appropriate query pieces, unless
 289                 # there's already an action specified, or unless 'edit' makes no sense
 290                 # (i.e., for a nonexistent special page).
 291                 if ( in_array( 'broken', $options ) && empty( $query['action'] )
 292                         && !$target->isSpecialPage() ) {
 293                         $query['action'] = 'edit';
 294                         $query['redlink'] = '1';
 295                 }
 296
 297                 if ( in_array( 'http', $options ) ) {
 298                         $proto = PROTO_HTTP;
 299                 } elseif ( in_array( 'https', $options ) ) {
 300                         $proto = PROTO_HTTPS;
 301                 } else {
 302                         $proto = PROTO_RELATIVE;
 303                 }
 304
 305                 $ret = $target->getLinkURL( $query, false, $proto );
 306                 wfProfileOut( __METHOD__ );
 307                 return $ret;
 308         }
 309
 310         /**
 311          * Returns the array of attributes used when linking to the Title $target
 312          *
 313          * @param Title $target
 314          * @param array $attribs
 315          * @param array $options
 316          *
 317          * @return array
 318          */
 319         private static function linkAttribs( $target, $attribs, $options ) {
 320                 wfProfileIn( __METHOD__ );
 321                 global $wgUser;
 322                 $defaults = array();
 323
 324                 if ( !in_array( 'noclasses', $options ) ) {
 325                         wfProfileIn( __METHOD__ . '-getClasses' );
 326                         # Now build the classes.
 327                         $classes = array();
 328
 329                         if ( in_array( 'broken', $options ) ) {
 330                                 $classes[] = 'new';
 331                         }
 332
 333                         if ( $target->isExternal() ) {
 334                                 $classes[] = 'extiw';
 335                         }
 336
 337                         if ( !in_array( 'broken', $options ) ) { # Avoid useless calls to LinkCache (see r50387)
 338                                 $colour = self::getLinkColour( $target, $wgUser->getStubThreshold() );
 339                                 if ( $colour !== '' ) {
 340                                         $classes[] = $colour; # mw-redirect or stub
 341                                 }
 342                         }
 343                         if ( $classes != array() ) {
 344                                 $defaults['class'] = implode( ' ', $classes );
 345                         }
 346                         wfProfileOut( __METHOD__ . '-getClasses' );
 347                 }
 348
 349                 # Get a default title attribute.
 350                 if ( $target->getPrefixedText() == '' ) {
 351                         # A link like [[#Foo]].  This used to mean an empty title
 352                         # attribute, but that's silly.  Just don't output a title.
 353                 } elseif ( in_array( 'known', $options ) ) {
 354                         $defaults['title'] = $target->getPrefixedText();
 355                 } else {
 356                         $defaults['title'] = wfMessage( 'red-link-title', $target->getPrefixedText() )->text();
 357                 }
 358
 359                 # Finally, merge the custom attribs with the default ones, and iterate
 360                 # over that, deleting all "false" attributes.
 361                 $ret = array();
 362                 $merged = Sanitizer::mergeAttributes( $defaults, $attribs );
 363                 foreach ( $merged as $key => $val ) {
 364                         # A false value suppresses the attribute, and we don't want the
 365                         # href attribute to be overridden.
 366                         if ( $key != 'href' and $val !== false ) {
 367                                 $ret[$key] = $val;
 368                         }
 369                 }
 370                 wfProfileOut( __METHOD__ );
 371                 return $ret;
 372         }
 373
 374         /**
 375          * Default text of the links to the Title $target
 376          *
 377          * @param Title $target
 378          *
 379          * @return string
 380          */
 381         private static function linkText( $target ) {
 382                 // We might be passed a non-Title by make*LinkObj().  Fail gracefully.
 383                 if ( !$target instanceof Title ) {
 384                         return '';
 385                 }
 386
 387                 // If the target is just a fragment, with no title, we return the fragment
 388                 // text.  Otherwise, we return the title text itself.
 389                 if ( $target->getPrefixedText() === '' && $target->hasFragment() ) {
 390                         return htmlspecialchars( $target->getFragment() );
 391                 }
 392
 393                 return htmlspecialchars( $target->getPrefixedText() );
 394         }
 395
 396         /**
 397          * Make appropriate markup for a link to the current article. This is
 398          * currently rendered as the bold link text. The calling sequence is the
 399          * same as the other make*LinkObj static functions, despite $query not
 400          * being used.
 401          *
 402          * @param Title $nt
 403          * @param string $html [optional]
 404          * @param string $query [optional]
 405          * @param string $trail [optional]
 406          * @param string $prefix [optional]
 407          *
 408          * @return string
 409          */
 410         public static function makeSelfLinkObj( $nt, $html = '', $query = '', $trail = '', $prefix = '' ) {
 411                 $ret = "<strong class=\"selflink\">{$prefix}{$html}</strong>{$trail}";
 412                 if ( !wfRunHooks( 'SelfLinkBegin', array( $nt, &$html, &$trail, &$prefix, &$ret ) ) ) {
 413                         return $ret;
 414                 }
 415
 416                 if ( $html == '' ) {
 417                         $html = htmlspecialchars( $nt->getPrefixedText() );
 418                 }
 419                 list( $inside, $trail ) = self::splitTrail( $trail );
 420                 return "<strong class=\"selflink\">{$prefix}{$html}{$inside}</strong>{$trail}";
 421         }
 422
 423         /**
 424          * Get a message saying that an invalid title was encountered.
 425          * This should be called after a method like Title::makeTitleSafe() returned
 426          * a value indicating that the title object is invalid.
 427          *
 428          * @param IContextSource $context Context to use to get the messages
 429          * @param int $namespace Namespace number
 430          * @param string $title Text of the title, without the namespace part
 431          * @return string
 432          */
 433         public static function getInvalidTitleDescription( IContextSource $context, $namespace, $title ) {
 434                 global $wgContLang;
 435
 436                 // First we check whether the namespace exists or not.
 437                 if ( MWNamespace::exists( $namespace ) ) {
 438                         if ( $namespace == NS_MAIN ) {
 439                                 $name = $context->msg( 'blanknamespace' )->text();
 440                         } else {
 441                                 $name = $wgContLang->getFormattedNsText( $namespace );
 442                         }
 443                         return $context->msg( 'invalidtitle-knownnamespace', $namespace, $name, $title )->text();
 444                 } else {
 445                         return $context->msg( 'invalidtitle-unknownnamespace', $namespace, $title )->text();
 446                 }
 447         }
 448
 449         /**
 450          * @param Title $title
 451          * @return Title
 452          */
 453         static function normaliseSpecialPage( Title $title ) {
 454                 if ( $title->isSpecialPage() ) {
 455                         list( $name, $subpage ) = SpecialPageFactory::resolveAlias( $title->getDBkey() );
 456                         if ( !$name ) {
 457                                 return $title;
 458                         }
 459                         $ret = SpecialPage::getTitleFor( $name, $subpage, $title->getFragment() );
 460                         return $ret;
 461                 } else {
 462                         return $title;
 463                 }
 464         }
 465
 466         /**
 467          * Returns the filename part of an url.
 468          * Used as alternative text for external images.
 469          *
 470          * @param string $url
 471          *
 472          * @return string
 473          */
 474         private static function fnamePart( $url ) {
 475                 $basename = strrchr( $url, '/' );
 476                 if ( false === $basename ) {
 477                         $basename = $url;
 478                 } else {
 479                         $basename = substr( $basename, 1 );
 480                 }
 481                 return $basename;
 482         }
 483
 484         /**
 485          * Return the code for images which were added via external links,
 486          * via Parser::maybeMakeExternalImage().
 487          *
 488          * @param string $url
 489          * @param string $alt
 490          *
 491          * @return string
 492          */
 493         public static function makeExternalImage( $url, $alt = '' ) {
 494                 if ( $alt == '' ) {
 495                         $alt = self::fnamePart( $url );
 496                 }
 497                 $img = '';
 498                 $success = wfRunHooks( 'LinkerMakeExternalImage', array( &$url, &$alt, &$img ) );
 499                 if ( !$success ) {
 500                         wfDebug( "Hook LinkerMakeExternalImage changed the output of external image "
 501                                 . "with url {$url} and alt text {$alt} to {$img}\n", true );
 502                         return $img;
 503                 }
 504                 return Html::element( 'img',
 505                         array(
 506                                 'src' => $url,
 507                                 'alt' => $alt ) );
 508         }
 509
 510         /**
 511          * Given parameters derived from [[Image:Foo|options...]], generate the
 512          * HTML that that syntax inserts in the page.
 513          *
 514          * @param Parser $parser
 515          * @param Title $title Title object of the file (not the currently viewed page)
 516          * @param File $file File object, or false if it doesn't exist
 517          * @param array $frameParams Associative array of parameters external to the media handler.
 518          *     Boolean parameters are indicated by presence or absence, the value is arbitrary and
 519          *     will often be false.
 520          *          thumbnail       If present, downscale and frame
 521          *          manualthumb     Image name to use as a thumbnail, instead of automatic scaling
 522          *          framed          Shows image in original size in a frame
 523          *          frameless       Downscale but don't frame
 524          *          upright         If present, tweak default sizes for portrait orientation
 525          *          upright_factor  Fudge factor for "upright" tweak (default 0.75)
 526          *          border          If present, show a border around the image
 527          *          align           Horizontal alignment (left, right, center, none)
 528          *          valign          Vertical alignment (baseline, sub, super, top, text-top, middle,
 529          *                          bottom, text-bottom)
 530          *          alt             Alternate text for image (i.e. alt attribute). Plain text.
 531          *          class           HTML for image classes. Plain text.
 532          *          caption         HTML for image caption.
 533          *          link-url        URL to link to
 534          *          link-title      Title object to link to
 535          *          link-target     Value for the target attribute, only with link-url
 536          *          no-link         Boolean, suppress description link
 537          *
 538          * @param array $handlerParams Associative array of media handler parameters, to be passed
 539          *       to transform(). Typical keys are "width" and "page".
 540          * @param string|bool $time Timestamp of the file, set as false for current
 541          * @param string $query Query params for desc url
 542          * @param int|null $widthOption Used by the parser to remember the user preference thumbnailsize
 543          * @since 1.20
 544          * @return string HTML for an image, with links, wrappers, etc.
 545          */
 546         public static function makeImageLink( /*Parser*/ $parser, Title $title,
 547                 $file, $frameParams = array(), $handlerParams = array(), $time = false,
 548                 $query = "", $widthOption = null
 549         ) {
 550                 $res = null;
 551                 $dummy = new DummyLinker;
 552                 if ( !wfRunHooks( 'ImageBeforeProduceHTML', array( &$dummy, &$title,
 553                         &$file, &$frameParams, &$handlerParams, &$time, &$res ) ) ) {
 554                         return $res;
 555                 }
 556
 557                 if ( $file && !$file->allowInlineDisplay() ) {
 558                         wfDebug( __METHOD__ . ': ' . $title->getPrefixedDBkey() . " does not allow inline display\n" );
 559                         return self::link( $title );
 560                 }
 561
 562                 // Shortcuts
 563                 $fp =& $frameParams;
 564                 $hp =& $handlerParams;
 565
 566                 // Clean up parameters
 567                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 568                 if ( !isset( $fp['align'] ) ) {
 569                         $fp['align'] = '';
 570                 }
 571                 if ( !isset( $fp['alt'] ) ) {
 572                         $fp['alt'] = '';
 573                 }
 574                 if ( !isset( $fp['title'] ) ) {
 575                         $fp['title'] = '';
 576                 }
 577                 if ( !isset( $fp['class'] ) ) {
 578                         $fp['class'] = '';
 579                 }
 580
 581                 $prefix = $postfix = '';
 582
 583                 if ( 'center' == $fp['align'] ) {
 584                         $prefix = '<div class="center">';
 585                         $postfix = '</div>';
 586                         $fp['align'] = 'none';
 587                 }
 588                 if ( $file && !isset( $hp['width'] ) ) {
 589                         if ( isset( $hp['height'] ) && $file->isVectorized() ) {
 590                                 // If its a vector image, and user only specifies height
 591                                 // we don't want it to be limited by its "normal" width.
 592                                 global $wgSVGMaxSize;
 593                                 $hp['width'] = $wgSVGMaxSize;
 594                         } else {
 595                                 $hp['width'] = $file->getWidth( $page );
 596                         }
 597
 598                         if ( isset( $fp['thumbnail'] )
 599                                 || isset( $fp['manualthumb'] )
 600                                 || isset( $fp['framed'] )
 601                                 || isset( $fp['frameless'] )
 602                                 || !$hp['width']
 603                         ) {
 604                                 global $wgThumbLimits, $wgThumbUpright;
 605
 606                                 if ( $widthOption === null || !isset( $wgThumbLimits[$widthOption] ) ) {
 607                                         $widthOption = User::getDefaultOption( 'thumbsize' );
 608                                 }
 609
 610                                 // Reduce width for upright images when parameter 'upright' is used
 611                                 if ( isset( $fp['upright'] ) && $fp['upright'] == 0 ) {
 612                                         $fp['upright'] = $wgThumbUpright;
 613                                 }
 614
 615                                 // For caching health: If width scaled down due to upright
 616                                 // parameter, round to full __0 pixel to avoid the creation of a
 617                                 // lot of odd thumbs.
 618                                 $prefWidth = isset( $fp['upright'] ) ?
 619                                         round( $wgThumbLimits[$widthOption] * $fp['upright'], -1 ) :
 620                                         $wgThumbLimits[$widthOption];
 621
 622                                 // Use width which is smaller: real image width or user preference width
 623                                 // Unless image is scalable vector.
 624                                 if ( !isset( $hp['height'] ) && ( $hp['width'] <= 0 ||
 625                                                 $prefWidth < $hp['width'] || $file->isVectorized() ) ) {
 626                                         $hp['width'] = $prefWidth;
 627                                 }
 628                         }
 629                 }
 630
 631                 if ( isset( $fp['thumbnail'] ) || isset( $fp['manualthumb'] ) || isset( $fp['framed'] ) ) {
 632                         # Create a thumbnail. Alignment depends on the writing direction of
 633                         # the page content language (right-aligned for LTR languages,
 634                         # left-aligned for RTL languages)
 635                         #
 636                         # If a thumbnail width has not been provided, it is set
 637                         # to the default user option as specified in Language*.php
 638                         if ( $fp['align'] == '' ) {
 639                                 if ( $parser instanceof Parser ) {
 640                                         $fp['align'] = $parser->getTargetLanguage()->alignEnd();
 641                                 } else {
 642                                         # backwards compatibility, remove with makeImageLink2()
 643                                         global $wgContLang;
 644                                         $fp['align'] = $wgContLang->alignEnd();
 645                                 }
 646                         }
 647                         return $prefix . self::makeThumbLink2( $title, $file, $fp, $hp, $time, $query ) . $postfix;
 648                 }
 649
 650                 if ( $file && isset( $fp['frameless'] ) ) {
 651                         $srcWidth = $file->getWidth( $page );
 652                         # For "frameless" option: do not present an image bigger than the
 653                         # source (for bitmap-style images). This is the same behavior as the
 654                         # "thumb" option does it already.
 655                         if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 656                                 $hp['width'] = $srcWidth;
 657                         }
 658                 }
 659
 660                 if ( $file && isset( $hp['width'] ) ) {
 661                         # Create a resized image, without the additional thumbnail features
 662                         $thumb = $file->transform( $hp );
 663                 } else {
 664                         $thumb = false;
 665                 }
 666
 667                 if ( !$thumb ) {
 668                         $s = self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 669                 } else {
 670                         self::processResponsiveImages( $file, $thumb, $hp );
 671                         $params = array(
 672                                 'alt' => $fp['alt'],
 673                                 'title' => $fp['title'],
 674                                 'valign' => isset( $fp['valign'] ) ? $fp['valign'] : false,
 675                                 'img-class' => $fp['class'] );
 676                         if ( isset( $fp['border'] ) ) {
 677                                 $params['img-class'] .= ( $params['img-class'] !== '' ? ' ' : '' ) . 'thumbborder';
 678                         }
 679                         $params = self::getImageLinkMTOParams( $fp, $query, $parser ) + $params;
 680
 681                         $s = $thumb->toHtml( $params );
 682                 }
 683                 if ( $fp['align'] != '' ) {
 684                         $s = "<div class=\"float{$fp['align']}\">{$s}</div>";
 685                 }
 686                 return str_replace( "\n", ' ', $prefix . $s . $postfix );
 687         }
 688
 689         /**
 690          * See makeImageLink()
 691          * When this function is removed, remove if( $parser instanceof Parser ) check there too
 692          * @deprecated since 1.20
 693          */
 694         public static function makeImageLink2( Title $title, $file, $frameParams = array(),
 695                 $handlerParams = array(), $time = false, $query = "", $widthOption = null ) {
 696                 return self::makeImageLink( null, $title, $file, $frameParams,
 697                         $handlerParams, $time, $query, $widthOption );
 698         }
 699
 700         /**
 701          * Get the link parameters for MediaTransformOutput::toHtml() from given
 702          * frame parameters supplied by the Parser.
 703          * @param array $frameParams The frame parameters
 704          * @param string $query An optional query string to add to description page links
 705          * @return array
 706          */
 707         private static function getImageLinkMTOParams( $frameParams, $query = '', $parser = null ) {
 708                 $mtoParams = array();
 709                 if ( isset( $frameParams['link-url'] ) && $frameParams['link-url'] !== '' ) {
 710                         $mtoParams['custom-url-link'] = $frameParams['link-url'];
 711                         if ( isset( $frameParams['link-target'] ) ) {
 712                                 $mtoParams['custom-target-link'] = $frameParams['link-target'];
 713                         }
 714                         if ( $parser ) {
 715                                 $extLinkAttrs = $parser->getExternalLinkAttribs( $frameParams['link-url'] );
 716                                 foreach ( $extLinkAttrs as $name => $val ) {
 717                                         // Currently could include 'rel' and 'target'
 718                                         $mtoParams['parser-extlink-' . $name] = $val;
 719                                 }
 720                         }
 721                 } elseif ( isset( $frameParams['link-title'] ) && $frameParams['link-title'] !== '' ) {
 722                         $mtoParams['custom-title-link'] = self::normaliseSpecialPage( $frameParams['link-title'] );
 723                 } elseif ( !empty( $frameParams['no-link'] ) ) {
 724                         // No link
 725                 } else {
 726                         $mtoParams['desc-link'] = true;
 727                         $mtoParams['desc-query'] = $query;
 728                 }
 729                 return $mtoParams;
 730         }
 731
 732         /**
 733          * Make HTML for a thumbnail including image, border and caption
 734          * @param Title $title
 735          * @param File|bool $file File object or false if it doesn't exist
 736          * @param string $label
 737          * @param string $alt
 738          * @param string $align
 739          * @param array $params
 740          * @param bool $framed
 741          * @param string $manualthumb
 742          * @return string
 743          */
 744         public static function makeThumbLinkObj( Title $title, $file, $label = '', $alt,
 745                 $align = 'right', $params = array(), $framed = false, $manualthumb = ""
 746         ) {
 747                 $frameParams = array(
 748                         'alt' => $alt,
 749                         'caption' => $label,
 750                         'align' => $align
 751                 );
 752                 if ( $framed ) {
 753                         $frameParams['framed'] = true;
 754                 }
 755                 if ( $manualthumb ) {
 756                         $frameParams['manualthumb'] = $manualthumb;
 757                 }
 758                 return self::makeThumbLink2( $title, $file, $frameParams, $params );
 759         }
 760
 761         /**
 762          * @param Title $title
 763          * @param File $file
 764          * @param array $frameParams
 765          * @param array $handlerParams
 766          * @param bool $time
 767          * @param string $query
 768          * @return string
 769          */
 770         public static function makeThumbLink2( Title $title, $file, $frameParams = array(),
 771                 $handlerParams = array(), $time = false, $query = ""
 772         ) {
 773                 global $wgStylePath, $wgContLang;
 774                 $exists = $file && $file->exists();
 775
 776                 # Shortcuts
 777                 $fp =& $frameParams;
 778                 $hp =& $handlerParams;
 779
 780                 $page = isset( $hp['page'] ) ? $hp['page'] : false;
 781                 if ( !isset( $fp['align'] ) ) {
 782                         $fp['align'] = 'right';
 783                 }
 784                 if ( !isset( $fp['alt'] ) ) {
 785                         $fp['alt'] = '';
 786                 }
 787                 if ( !isset( $fp['title'] ) ) {
 788                         $fp['title'] = '';
 789                 }
 790                 if ( !isset( $fp['caption'] ) ) {
 791                         $fp['caption'] = '';
 792                 }
 793
 794                 if ( empty( $hp['width'] ) ) {
 795                         // Reduce width for upright images when parameter 'upright' is used
 796                         $hp['width'] = isset( $fp['upright'] ) ? 130 : 180;
 797                 }
 798                 $thumb = false;
 799                 $noscale = false;
 800                 $manualthumb = false;
 801
 802                 if ( !$exists ) {
 803                         $outerWidth = $hp['width'] + 2;
 804                 } else {
 805                         if ( isset( $fp['manualthumb'] ) ) {
 806                                 # Use manually specified thumbnail
 807                                 $manual_title = Title::makeTitleSafe( NS_FILE, $fp['manualthumb'] );
 808                                 if ( $manual_title ) {
 809                                         $manual_img = wfFindFile( $manual_title );
 810                                         if ( $manual_img ) {
 811                                                 $thumb = $manual_img->getUnscaledThumb( $hp );
 812                                                 $manualthumb = true;
 813                                         } else {
 814                                                 $exists = false;
 815                                         }
 816                                 }
 817                         } elseif ( isset( $fp['framed'] ) ) {
 818                                 // Use image dimensions, don't scale
 819                                 $thumb = $file->getUnscaledThumb( $hp );
 820                                 $noscale = true;
 821                         } else {
 822                                 # Do not present an image bigger than the source, for bitmap-style images
 823                                 # This is a hack to maintain compatibility with arbitrary pre-1.10 behavior
 824                                 $srcWidth = $file->getWidth( $page );
 825                                 if ( $srcWidth && !$file->mustRender() && $hp['width'] > $srcWidth ) {
 826                                         $hp['width'] = $srcWidth;
 827                                 }
 828                                 $thumb = $file->transform( $hp );
 829                         }
 830
 831                         if ( $thumb ) {
 832                                 $outerWidth = $thumb->getWidth() + 2;
 833                         } else {
 834                                 $outerWidth = $hp['width'] + 2;
 835                         }
 836                 }
 837
 838                 # ThumbnailImage::toHtml() already adds page= onto the end of DjVu URLs
 839                 # So we don't need to pass it here in $query. However, the URL for the
 840                 # zoom icon still needs it, so we make a unique query for it. See bug 14771
 841                 $url = $title->getLocalURL( $query );
 842                 if ( $page ) {
 843                         $url = wfAppendQuery( $url, array( 'page' => $page ) );
 844                 }
 845                 if ( $manualthumb
 846                         && !isset( $fp['link-title'] )
 847                         && !isset( $fp['link-url'] )
 848                         && !isset( $fp['no-link'] ) ) {
 849                         $fp['link-url'] = $url;
 850                 }
 851
 852                 $s = "<div class=\"thumb t{$fp['align']}\">"
 853                         . "<div class=\"thumbinner\" style=\"width:{$outerWidth}px;\">";
 854
 855                 if ( !$exists ) {
 856                         $s .= self::makeBrokenImageLinkObj( $title, $fp['title'], '', '', '', $time == true );
 857                         $zoomIcon = '';
 858                 } elseif ( !$thumb ) {
 859                         $s .= wfMessage( 'thumbnail_error', '' )->escaped();
 860                         $zoomIcon = '';
 861                 } else {
 862                         if ( !$noscale && !$manualthumb ) {
 863                                 self::processResponsiveImages( $file, $thumb, $hp );
 864                         }
 865                         $params = array(
 866                                 'alt' => $fp['alt'],
 867                                 'title' => $fp['title'],
 868                                 'img-class' => ( isset( $fp['class'] ) && $fp['class'] !== ''
 869                                         ? $fp['class'] . ' '
 870                                         : '' ) . 'thumbimage'
 871                         );
 872                         $params = self::getImageLinkMTOParams( $fp, $query ) + $params;
 873                         $s .= $thumb->toHtml( $params );
 874                         if ( isset( $fp['framed'] ) ) {
 875                                 $zoomIcon = "";
 876                         } else {
 877                                 $zoomIcon = Html::rawElement( 'div', array( 'class' => 'magnify' ),
 878                                         Html::rawElement( 'a', array(
 879                                                 'href' => $url,
 880                                                 'class' => 'internal',
 881                                                 'title' => wfMessage( 'thumbnail-more' )->text() ),
 882                                                 Html::element( 'img', array(
 883                                                         'src' => $wgStylePath . '/common/images/magnify-clip'
 884                                                                 . ( $wgContLang->isRTL() ? '-rtl' : '' ) . '.png',
 885                                                         'width' => 15,
 886                                                         'height' => 11,
 887                                                         'alt' => "" ) ) ) );
 888                         }
 889                 }
 890                 $s .= '  <div class="thumbcaption">' . $zoomIcon . $fp['caption'] . "</div></div></div>";
 891                 return str_replace( "\n", ' ', $s );
 892         }
 893
 894         /**
 895          * Process responsive images: add 1.5x and 2x subimages to the thumbnail, where
 896          * applicable.
 897          *
 898          * @param File $file
 899          * @param MediaTransformOutput $thumb
 900          * @param array $hp Image parameters
 901          */
 902         public static function processResponsiveImages( $file, $thumb, $hp ) {
 903                 global $wgResponsiveImages;
 904                 if ( $wgResponsiveImages ) {
 905                         $hp15 = $hp;
 906                         $hp15['width'] = round( $hp['width'] * 1.5 );
 907                         $hp20 = $hp;
 908                         $hp20['width'] = $hp['width'] * 2;
 909                         if ( isset( $hp['height'] ) ) {
 910                                 $hp15['height'] = round( $hp['height'] * 1.5 );
 911                                 $hp20['height'] = $hp['height'] * 2;
 912                         }
 913
 914                         $thumb15 = $file->transform( $hp15 );
 915                         $thumb20 = $file->transform( $hp20 );
 916                         if ( $thumb15 && $thumb15->getUrl() !== $thumb->getUrl() ) {
 917                                 $thumb->responsiveUrls['1.5'] = $thumb15->getUrl();
 918                         }
 919                         if ( $thumb20 && $thumb20->getUrl() !== $thumb->getUrl() ) {
 920                                 $thumb->responsiveUrls['2'] = $thumb20->getUrl();
 921                         }
 922                 }
 923         }
 924
 925         /**
 926          * Make a "broken" link to an image
 927          *
 928          * @param Title $title
 929          * @param string $label Link label (plain text)
 930          * @param string $query Query string
 931          * @param string $unused1 Unused parameter kept for b/c
 932          * @param string $unused2 Unused parameter kept for b/c
 933          * @param bool $time A file of a certain timestamp was requested
 934          * @return string
 935          */
 936         public static function makeBrokenImageLinkObj( $title, $label = '',
 937                 $query = '', $unused1 = '', $unused2 = '', $time = false
 938         ) {
 939                 global $wgEnableUploads, $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 940                 if ( !$title instanceof Title ) {
 941                         return "<!-- ERROR -->" . htmlspecialchars( $label );
 942                 }
 943                 wfProfileIn( __METHOD__ );
 944                 if ( $label == '' ) {
 945                         $label = $title->getPrefixedText();
 946                 }
 947                 $encLabel = htmlspecialchars( $label );
 948                 $currentExists = $time ? ( wfFindFile( $title ) != false ) : false;
 949
 950                 if ( ( $wgUploadMissingFileUrl || $wgUploadNavigationUrl || $wgEnableUploads )
 951                         && !$currentExists
 952                 ) {
 953                         $redir = RepoGroup::singleton()->getLocalRepo()->checkRedirect( $title );
 954
 955                         if ( $redir ) {
 956                                 wfProfileOut( __METHOD__ );
 957                                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 958                         }
 959
 960                         $href = self::getUploadUrl( $title, $query );
 961
 962                         wfProfileOut( __METHOD__ );
 963                         return '<a href="' . htmlspecialchars( $href ) . '" class="new" title="' .
 964                                 htmlspecialchars( $title->getPrefixedText(), ENT_QUOTES ) . '">' .
 965                                 $encLabel . '</a>';
 966                 }
 967
 968                 wfProfileOut( __METHOD__ );
 969                 return self::linkKnown( $title, $encLabel, array(), wfCgiToArray( $query ) );
 970         }
 971
 972         /**
 973          * Get the URL to upload a certain file
 974          *
 975          * @param Title $destFile Title object of the file to upload
 976          * @param string $query Urlencoded query string to prepend
 977          * @return string Urlencoded URL
 978          */
 979         protected static function getUploadUrl( $destFile, $query = '' ) {
 980                 global $wgUploadMissingFileUrl, $wgUploadNavigationUrl;
 981                 $q = 'wpDestFile=' . $destFile->getPartialURL();
 982                 if ( $query != '' ) {
 983                         $q .= '&' . $query;
 984                 }
 985
 986                 if ( $wgUploadMissingFileUrl ) {
 987                         return wfAppendQuery( $wgUploadMissingFileUrl, $q );
 988                 } elseif ( $wgUploadNavigationUrl ) {
 989                         return wfAppendQuery( $wgUploadNavigationUrl, $q );
 990                 } else {
 991                         $upload = SpecialPage::getTitleFor( 'Upload' );
 992                         return $upload->getLocalURL( $q );
 993                 }
 994         }
 995
 996         /**
 997          * Create a direct link to a given uploaded file.
 998          *
 999          * @param Title $title
1000          * @param string $html Pre-sanitized HTML
1001          * @param string $time MW timestamp of file creation time
1002          * @return string HTML
1003          */
1004         public static function makeMediaLinkObj( $title, $html = '', $time = false ) {
1005                 $img = wfFindFile( $title, array( 'time' => $time ) );
1006                 return self::makeMediaLinkFile( $title, $img, $html );
1007         }
1008
1009         /**
1010          * Create a direct link to a given uploaded file.
1011          * This will make a broken link if $file is false.
1012          *
1013          * @param Title $title
1014          * @param File|bool $file File object or false
1015          * @param string $html Pre-sanitized HTML
1016          * @return string HTML
1017          *
1018          * @todo Handle invalid or missing images better.
1019          */
1020         public static function makeMediaLinkFile( Title $title, $file, $html = '' ) {
1021                 if ( $file && $file->exists() ) {
1022                         $url = $file->getURL();
1023                         $class = 'internal';
1024                 } else {
1025                         $url = self::getUploadUrl( $title );
1026                         $class = 'new';
1027                 }
1028
1029                 $alt = $title->getText();
1030                 if ( $html == '' ) {
1031                         $html = $alt;
1032                 }
1033
1034                 $ret = '';
1035                 $attribs = array(
1036                         'href' => $url,
1037                         'class' => $class,
1038                         'title' => $alt
1039                 );
1040
1041                 if ( !wfRunHooks( 'LinkerMakeMediaLinkFile',
1042                         array( $title, $file, &$html, &$attribs, &$ret ) ) ) {
1043                         wfDebug( "Hook LinkerMakeMediaLinkFile changed the output of link "
1044                                 . "with url {$url} and text {$html} to {$ret}\n", true );
1045                         return $ret;
1046                 }
1047
1048                 return Html::rawElement( 'a', $attribs, $html );
1049         }
1050
1051         /**
1052          * Make a link to a special page given its name and, optionally,
1053          * a message key from the link text.
1054          * Usage example: Linker::specialLink( 'Recentchanges' )
1055          *
1056          * @param string $name
1057          * @param string $key
1058          * @return string
1059          */
1060         public static function specialLink( $name, $key = '' ) {
1061                 if ( $key == '' ) {
1062                         $key = strtolower( $name );
1063                 }
1064
1065                 return self::linkKnown( SpecialPage::getTitleFor( $name ), wfMessage( $key )->text() );
1066         }
1067
1068         /**
1069          * Make an external link
1070          * @param string $url URL to link to
1071          * @param string $text Text of link
1072          * @param bool $escape Do we escape the link text?
1073          * @param string $linktype Type of external link. Gets added to the classes
1074          * @param array $attribs Array of extra attributes to <a>
1075          * @param Title|null $title Title object used for title specific link attributes
1076          * @return string
1077          */
1078         public static function makeExternalLink( $url, $text, $escape = true,
1079                 $linktype = '', $attribs = array(), $title = null
1080         ) {
1081                 global $wgTitle;
1082                 $class = "external";
1083                 if ( $linktype ) {
1084                         $class .= " $linktype";
1085                 }
1086                 if ( isset( $attribs['class'] ) && $attribs['class'] ) {
1087                         $class .= " {$attribs['class']}";
1088                 }
1089                 $attribs['class'] = $class;
1090
1091                 if ( $escape ) {
1092                         $text = htmlspecialchars( $text );
1093                 }
1094
1095                 if ( !$title ) {
1096                         $title = $wgTitle;
1097                 }
1098                 $attribs['rel'] = Parser::getExternalLinkRel( $url, $title );
1099                 $link = '';
1100                 $success = wfRunHooks( 'LinkerMakeExternalLink',
1101                         array( &$url, &$text, &$link, &$attribs, $linktype ) );
1102                 if ( !$success ) {
1103                         wfDebug( "Hook LinkerMakeExternalLink changed the output of link "
1104                                 . "with url {$url} and text {$text} to {$link}\n", true );
1105                         return $link;
1106                 }
1107                 $attribs['href'] = $url;
1108                 return Html::rawElement( 'a', $attribs, $text );
1109         }
1110
1111         /**
1112          * Make user link (or user contributions for unregistered users)
1113          * @param int $userId User id in database.
1114          * @param string $userName User name in database.
1115          * @param string $altUserName Text to display instead of the user name (optional)
1116          * @return string HTML fragment
1117          * @since 1.19 Method exists for a long time. $altUserName was added in 1.19.
1118          */
1119         public static function userLink( $userId, $userName, $altUserName = false ) {
1120                 $classes = 'mw-userlink';
1121                 if ( $userId == 0 ) {
1122                         $page = SpecialPage::getTitleFor( 'Contributions', $userName );
1123                         if ( $altUserName === false ) {
1124                                 $altUserName = IP::prettifyIP( $userName );
1125                         }
1126                         $classes .= ' mw-anonuserlink'; // Separate link class for anons (bug 43179)
1127                 } else {
1128                         $page = Title::makeTitle( NS_USER, $userName );
1129                 }
1130
1131                 return self::link(
1132                         $page,
1133                         htmlspecialchars( $altUserName !== false ? $altUserName : $userName ),
1134                         array( 'class' => $classes )
1135                 );
1136         }
1137
1138         /**
1139          * Generate standard user tool links (talk, contributions, block link, etc.)
1140          *
1141          * @param int $userId User identifier
1142          * @param string $userText User name or IP address
1143          * @param bool $redContribsWhenNoEdits Should the contributions link be
1144          *   red if the user has no edits?
1145          * @param int $flags Customisation flags (e.g. Linker::TOOL_LINKS_NOBLOCK
1146          *   and Linker::TOOL_LINKS_EMAIL).
1147          * @param int $edits User edit count (optional, for performance)
1148          * @return string HTML fragment
1149          */
1150         public static function userToolLinks(
1151                 $userId, $userText, $redContribsWhenNoEdits = false, $flags = 0, $edits = null
1152         ) {
1153                 global $wgUser, $wgDisableAnonTalk, $wgLang;
1154                 $talkable = !( $wgDisableAnonTalk && 0 == $userId );
1155                 $blockable = !( $flags & self::TOOL_LINKS_NOBLOCK );
1156                 $addEmailLink = $flags & self::TOOL_LINKS_EMAIL && $userId;
1157
1158                 $items = array();
1159                 if ( $talkable ) {
1160                         $items[] = self::userTalkLink( $userId, $userText );
1161                 }
1162                 if ( $userId ) {
1163                         // check if the user has an edit
1164                         $attribs = array();
1165                         if ( $redContribsWhenNoEdits ) {
1166                                 if ( intval( $edits ) === 0 && $edits !== 0 ) {
1167                                         $user = User::newFromId( $userId );
1168                                         $edits = $user->getEditCount();
1169                                 }
1170                                 if ( $edits === 0 ) {
1171                                         $attribs['class'] = 'new';
1172                                 }
1173                         }
1174                         $contribsPage = SpecialPage::getTitleFor( 'Contributions', $userText );
1175
1176                         $items[] = self::link( $contribsPage, wfMessage( 'contribslink' )->escaped(), $attribs );
1177                 }
1178                 if ( $blockable && $wgUser->isAllowed( 'block' ) ) {
1179                         $items[] = self::blockLink( $userId, $userText );
1180                 }
1181
1182                 if ( $addEmailLink && $wgUser->canSendEmail() ) {
1183                         $items[] = self::emailLink( $userId, $userText );
1184                 }
1185
1186                 wfRunHooks( 'UserToolLinksEdit', array( $userId, $userText, &$items ) );
1187
1188                 if ( $items ) {
1189                         return wfMessage( 'word-separator' )->plain()
1190                                 . '<span class="mw-usertoollinks">'
1191                                 . wfMessage( 'parentheses' )->rawParams( $wgLang->pipeList( $items ) )->escaped()
1192                                 . '</span>';
1193                 } else {
1194                         return '';
1195                 }
1196         }
1197
1198         /**
1199          * Alias for userToolLinks( $userId, $userText, true );
1200          * @param int $userId User identifier
1201          * @param string $userText User name or IP address
1202          * @param int $edits User edit count (optional, for performance)
1203          * @return string
1204          */
1205         public static function userToolLinksRedContribs( $userId, $userText, $edits = null ) {
1206                 return self::userToolLinks( $userId, $userText, true, 0, $edits );
1207         }
1208
1209         /**
1210          * @param int $userId User id in database.
1211          * @param string $userText User name in database.
1212          * @return string HTML fragment with user talk link
1213          */
1214         public static function userTalkLink( $userId, $userText ) {
1215                 $userTalkPage = Title::makeTitle( NS_USER_TALK, $userText );
1216                 $userTalkLink = self::link( $userTalkPage, wfMessage( 'talkpagelinktext' )->escaped() );
1217                 return $userTalkLink;
1218         }
1219
1220         /**
1221          * @param int $userId Userid
1222          * @param string $userText User name in database.
1223          * @return string HTML fragment with block link
1224          */
1225         public static function blockLink( $userId, $userText ) {
1226                 $blockPage = SpecialPage::getTitleFor( 'Block', $userText );
1227                 $blockLink = self::link( $blockPage, wfMessage( 'blocklink' )->escaped() );
1228                 return $blockLink;
1229         }
1230
1231         /**
1232          * @param int $userId Userid
1233          * @param string $userText User name in database.
1234          * @return string HTML fragment with e-mail user link
1235          */
1236         public static function emailLink( $userId, $userText ) {
1237                 $emailPage = SpecialPage::getTitleFor( 'Emailuser', $userText );
1238                 $emailLink = self::link( $emailPage, wfMessage( 'emaillink' )->escaped() );
1239                 return $emailLink;
1240         }
1241
1242         /**
1243          * Generate a user link if the current user is allowed to view it
1244          * @param Revision $rev
1245          * @param bool $isPublic Show only if all users can see it
1246          * @return string HTML fragment
1247          */
1248         public static function revUserLink( $rev, $isPublic = false ) {
1249                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1250                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1251                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1252                         $link = self::userLink( $rev->getUser( Revision::FOR_THIS_USER ),
1253                                 $rev->getUserText( Revision::FOR_THIS_USER ) );
1254                 } else {
1255                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1256                 }
1257                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1258                         return '<span class="history-deleted">' . $link . '</span>';
1259                 }
1260                 return $link;
1261         }
1262
1263         /**
1264          * Generate a user tool link cluster if the current user is allowed to view it
1265          * @param Revision $rev
1266          * @param bool $isPublic Show only if all users can see it
1267          * @return string HTML
1268          */
1269         public static function revUserTools( $rev, $isPublic = false ) {
1270                 if ( $rev->isDeleted( Revision::DELETED_USER ) && $isPublic ) {
1271                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1272                 } elseif ( $rev->userCan( Revision::DELETED_USER ) ) {
1273                         $userId = $rev->getUser( Revision::FOR_THIS_USER );
1274                         $userText = $rev->getUserText( Revision::FOR_THIS_USER );
1275                         $link = self::userLink( $userId, $userText )
1276                                 . wfMessage( 'word-separator' )->plain()
1277                                 . self::userToolLinks( $userId, $userText );
1278                 } else {
1279                         $link = wfMessage( 'rev-deleted-user' )->escaped();
1280                 }
1281                 if ( $rev->isDeleted( Revision::DELETED_USER ) ) {
1282                         return ' <span class="history-deleted">' . $link . '</span>';
1283                 }
1284                 return $link;
1285         }
1286
1287         /**
1288          * This function is called by all recent changes variants, by the page history,
1289          * and by the user contributions list. It is responsible for formatting edit
1290          * summaries. It escapes any HTML in the summary, but adds some CSS to format
1291          * auto-generated comments (from section editing) and formats [[wikilinks]].
1292          *
1293          * @author Erik Moeller <moeller@scireview.de>
1294          *
1295          * Note: there's not always a title to pass to this function.
1296          * Since you can't set a default parameter for a reference, I've turned it
1297          * temporarily to a value pass. Should be adjusted further. --brion
1298          *
1299          * @param string $comment
1300          * @param Title|null $title Title object (to generate link to the section in autocomment) or null
1301          * @param bool $local Whether section links should refer to local page
1302          * @return mixed|string
1303          */
1304         public static function formatComment( $comment, $title = null, $local = false ) {
1305                 wfProfileIn( __METHOD__ );
1306
1307                 # Sanitize text a bit:
1308                 $comment = str_replace( "\n", " ", $comment );
1309                 # Allow HTML entities (for bug 13815)
1310                 $comment = Sanitizer::escapeHtmlAllowEntities( $comment );
1311
1312                 # Render autocomments and make links:
1313                 $comment = self::formatAutocomments( $comment, $title, $local );
1314                 $comment = self::formatLinksInComment( $comment, $title, $local );
1315
1316                 wfProfileOut( __METHOD__ );
1317                 return $comment;
1318         }
1319
1320         /**
1321          * Converts autogenerated comments in edit summaries into section links.
1322          * The pattern for autogen comments is / * foo * /, which makes for
1323          * some nasty regex.
1324          * We look for all comments, match any text before and after the comment,
1325          * add a separator where needed and format the comment itself with CSS
1326          * Called by Linker::formatComment.
1327          *
1328          * @param string $comment Comment text
1329          * @param Title|null $title An optional title object used to links to sections
1330          * @param bool $local Whether section links should refer to local page
1331          * @return string Formatted comment
1332          */
1333         private static function formatAutocomments( $comment, $title = null, $local = false ) {
1334                 return preg_replace_callback(
1335                         '!(.*)/\*\s*(.*?)\s*\*/(.*)!',
1336                         function ( $match ) use ( $title, $local ) {
1337                                 global $wgLang;
1338
1339                                 $pre = $match[1];
1340                                 $auto = $match[2];
1341                                 $post = $match[3];
1342                                 $comment = null;
1343                                 wfRunHooks( 'FormatAutocomments', array( &$comment, $pre, $auto, $post, $title, $local ) );
1344                                 if ( $comment === null ) {
1345                                         $link = '';
1346                                         if ( $title ) {
1347                                                 $section = $auto;
1348                                                 # Remove links that a user may have manually put in the autosummary
1349                                                 # This could be improved by copying as much of Parser::stripSectionName as desired.
1350                                                 $section = str_replace( '[[:', '', $section );
1351                                                 $section = str_replace( '[[', '', $section );
1352                                                 $section = str_replace( ']]', '', $section );
1353
1354                                                 $section = Sanitizer::normalizeSectionNameWhitespace( $section ); # bug 22784
1355                                                 if ( $local ) {
1356                                                         $sectionTitle = Title::newFromText( '#' . $section );
1357                                                 } else {
1358                                                         $sectionTitle = Title::makeTitleSafe( $title->getNamespace(),
1359                                                                 $title->getDBkey(), $section );
1360                                                 }
1361                                                 if ( $sectionTitle ) {
1362                                                         $link = Linker::link( $sectionTitle,
1363                                                                 $wgLang->getArrow(), array(), array(),
1364                                                                 'noclasses' );
1365                                                 } else {
1366                                                         $link = '';
1367                                                 }
1368                                         }
1369                                         if ( $pre ) {
1370                                                 # written summary $presep autocomment (summary /* section */)
1371                                                 $pre .= wfMessage( 'autocomment-prefix' )->inContentLanguage()->escaped();
1372                                         }
1373                                         if ( $post ) {
1374                                                 # autocomment $postsep written summary (/* section */ summary)
1375                                                 $auto .= wfMessage( 'colon-separator' )->inContentLanguage()->escaped();
1376                                         }
1377                                         $auto = '<span class="autocomment">' . $auto . '</span>';
1378                                         $comment = $pre . $link . $wgLang->getDirMark()
1379                                                 . '<span dir="auto">' . $auto . $post . '</span>';
1380                                 }
1381                                 return $comment;
1382                         },
1383                         $comment
1384                 );
1385         }
1386
1387         /**
1388          * Formats wiki links and media links in text; all other wiki formatting
1389          * is ignored
1390          *
1391          * @todo FIXME: Doesn't handle sub-links as in image thumb texts like the main parser
1392          * @param string $comment Text to format links in
1393          * @param Title|null $title An optional title object used to links to sections
1394          * @param bool $local Whether section links should refer to local page
1395          * @return string
1396          */
1397         public static function formatLinksInComment( $comment, $title = null, $local = false ) {
1398                 return preg_replace_callback(
1399                         '/
1400                                 \[\[
1401                                 :? # ignore optional leading colon
1402                                 ([^\]|]+) # 1. link target; page names cannot include ] or |
1403                                 (?:\|
1404                                         # 2. a pipe-separated substring; only the last is captured
1405                                         # Stop matching at | and ]] without relying on backtracking.
1406                                         ((?:]?[^\]|])*+)
1407                                 )*
1408                                 \]\]
1409                                 ([^[]*) # 3. link trail (the text up until the next link)
1410                         /x',
1411                         function ( $match ) use ( $title, $local ) {
1412                                 global $wgContLang;
1413
1414                                 $medians = '(?:' . preg_quote( MWNamespace::getCanonicalName( NS_MEDIA ), '/' ) . '|';
1415                                 $medians .= preg_quote( $wgContLang->getNsText( NS_MEDIA ), '/' ) . '):';
1416
1417                                 $comment = $match[0];
1418
1419                                 # fix up urlencoded title texts (copied from Parser::replaceInternalLinks)
1420                                 if ( strpos( $match[1], '%' ) !== false ) {
1421                                         $match[1] = str_replace(
1422                                                 array( '<', '>' ),
1423                                                 array( '&lt;', '&gt;' ),
1424                                                 rawurldecode( $match[1] )
1425                                         );
1426                                 }
1427
1428                                 # Handle link renaming [[foo|text]] will show link as "text"
1429                                 if ( $match[2] != "" ) {
1430                                         $text = $match[2];
1431                                 } else {
1432                                         $text = $match[1];
1433                                 }
1434                                 $submatch = array();
1435                                 $thelink = null;
1436                                 if ( preg_match( '/^' . $medians . '(.*)$/i', $match[1], $submatch ) ) {
1437                                         # Media link; trail not supported.
1438                                         $linkRegexp = '/\[\[(.*?)\]\]/';
1439                                         $title = Title::makeTitleSafe( NS_FILE, $submatch[1] );
1440                                         if ( $title ) {
1441                                                 $thelink = Linker::makeMediaLinkObj( $title, $text );
1442                                         }
1443                                 } else {
1444                                         # Other kind of link
1445                                         if ( preg_match( $wgContLang->linkTrail(), $match[3], $submatch ) ) {
1446                                                 $trail = $submatch[1];
1447                                         } else {
1448                                                 $trail = "";
1449                                         }
1450                                         $linkRegexp = '/\[\[(.*?)\]\]' . preg_quote( $trail, '/' ) . '/';
1451                                         if ( isset( $match[1][0] ) && $match[1][0] == ':' ) {
1452                                                 $match[1] = substr( $match[1], 1 );
1453                                         }
1454                                         list( $inside, $trail ) = Linker::splitTrail( $trail );
1455
1456                                         $linkText = $text;
1457                                         $linkTarget = Linker::normalizeSubpageLink( $title, $match[1], $linkText );
1458
1459                                         $target = Title::newFromText( $linkTarget );
1460                                         if ( $target ) {
1461                                                 if ( $target->getText() == '' && !$target->isExternal()
1462                                                         && !$local && $title
1463                                                 ) {
1464                                                         $newTarget = clone ( $title );
1465                                                         $newTarget->setFragment( '#' . $target->getFragment() );
1466                                                         $target = $newTarget;
1467                                                 }
1468                                                 $thelink = Linker::link(
1469                                                         $target,
1470                                                         $linkText . $inside
1471                                                 ) . $trail;
1472                                         }
1473                                 }
1474                                 if ( $thelink ) {
1475                                         // If the link is still valid, go ahead and replace it in!
1476                                         $comment = preg_replace(
1477                                                 $linkRegexp,
1478                                                 StringUtils::escapeRegexReplacement( $thelink ),
1479                                                 $comment,
1480                                                 1
1481                                         );
1482                                 }
1483
1484                                 return $comment;
1485                         },
1486                         $comment
1487                 );
1488         }
1489
1490         /**
1491          * @param Title $contextTitle
1492          * @param string $target
1493          * @param string $text
1494          * @return string
1495          */
1496         public static function normalizeSubpageLink( $contextTitle, $target, &$text ) {
1497                 # Valid link forms:
1498                 # Foobar -- normal
1499                 # :Foobar -- override special treatment of prefix (images, language links)
1500                 # /Foobar -- convert to CurrentPage/Foobar
1501                 # /Foobar/ -- convert to CurrentPage/Foobar, strip the initial / from text
1502                 # ../ -- convert to CurrentPage, from CurrentPage/CurrentSubPage
1503                 # ../Foobar -- convert to CurrentPage/Foobar, from CurrentPage/CurrentSubPage
1504
1505                 wfProfileIn( __METHOD__ );
1506                 $ret = $target; # default return value is no change
1507
1508                 # Some namespaces don't allow subpages,
1509                 # so only perform processing if subpages are allowed
1510                 if ( $contextTitle && MWNamespace::hasSubpages( $contextTitle->getNamespace() ) ) {
1511                         $hash = strpos( $target, '#' );
1512                         if ( $hash !== false ) {
1513                                 $suffix = substr( $target, $hash );
1514                                 $target = substr( $target, 0, $hash );
1515                         } else {
1516                                 $suffix = '';
1517                         }
1518                         # bug 7425
1519                         $target = trim( $target );
1520                         # Look at the first character
1521                         if ( $target != '' && $target[0] === '/' ) {
1522                                 # / at end means we don't want the slash to be shown
1523                                 $m = array();
1524                                 $trailingSlashes = preg_match_all( '%(/+)$%', $target, $m );
1525                                 if ( $trailingSlashes ) {
1526                                         $noslash = $target = substr( $target, 1, -strlen( $m[0][0] ) );
1527                                 } else {
1528                                         $noslash = substr( $target, 1 );
1529                                 }
1530
1531                                 $ret = $contextTitle->getPrefixedText() . '/' . trim( $noslash ) . $suffix;
1532                                 if ( $text === '' ) {
1533                                         $text = $target . $suffix;
1534                                 } # this might be changed for ugliness reasons
1535                         } else {
1536                                 # check for .. subpage backlinks
1537                                 $dotdotcount = 0;
1538                                 $nodotdot = $target;
1539                                 while ( strncmp( $nodotdot, "../", 3 ) == 0 ) {
1540                                         ++$dotdotcount;
1541                                         $nodotdot = substr( $nodotdot, 3 );
1542                                 }
1543                                 if ( $dotdotcount > 0 ) {
1544                                         $exploded = explode( '/', $contextTitle->getPrefixedText() );
1545                                         if ( count( $exploded ) > $dotdotcount ) { # not allowed to go below top level page
1546                                                 $ret = implode( '/', array_slice( $exploded, 0, -$dotdotcount ) );
1547                                                 # / at the end means don't show full path
1548                                                 if ( substr( $nodotdot, -1, 1 ) === '/' ) {
1549                                                         $nodotdot = substr( $nodotdot, 0, -1 );
1550                                                         if ( $text === '' ) {
1551                                                                 $text = $nodotdot . $suffix;
1552                                                         }
1553                                                 }
1554                                                 $nodotdot = trim( $nodotdot );
1555                                                 if ( $nodotdot != '' ) {
1556                                                         $ret .= '/' . $nodotdot;
1557                                                 }
1558                                                 $ret .= $suffix;
1559                                         }
1560                                 }
1561                         }
1562                 }
1563
1564                 wfProfileOut( __METHOD__ );
1565                 return $ret;
1566         }
1567
1568         /**
1569          * Wrap a comment in standard punctuation and formatting if
1570          * it's non-empty, otherwise return empty string.
1571          *
1572          * @param string $comment
1573          * @param Title|null $title Title object (to generate link to section in autocomment) or null
1574          * @param bool $local Whether section links should refer to local page
1575          *
1576          * @return string
1577          */
1578         public static function commentBlock( $comment, $title = null, $local = false ) {
1579                 // '*' used to be the comment inserted by the software way back
1580                 // in antiquity in case none was provided, here for backwards
1581                 // compatibility, acc. to brion -ævar
1582                 if ( $comment == '' || $comment == '*' ) {
1583                         return '';
1584                 } else {
1585                         $formatted = self::formatComment( $comment, $title, $local );
1586                         $formatted = wfMessage( 'parentheses' )->rawParams( $formatted )->escaped();
1587                         return " <span class=\"comment\">$formatted</span>";
1588                 }
1589         }
1590
1591         /**
1592          * Wrap and format the given revision's comment block, if the current
1593          * user is allowed to view it.
1594          *
1595          * @param Revision $rev
1596          * @param bool $local Whether section links should refer to local page
1597          * @param bool $isPublic Show only if all users can see it
1598          * @return string HTML fragment
1599          */
1600         public static function revComment( Revision $rev, $local = false, $isPublic = false ) {
1601                 if ( $rev->getRawComment() == "" ) {
1602                         return "";
1603                 }
1604                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) && $isPublic ) {
1605                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1606                 } elseif ( $rev->userCan( Revision::DELETED_COMMENT ) ) {
1607                         $block = self::commentBlock( $rev->getComment( Revision::FOR_THIS_USER ),
1608                                 $rev->getTitle(), $local );
1609                 } else {
1610                         $block = " <span class=\"comment\">" . wfMessage( 'rev-deleted-comment' )->escaped() . "</span>";
1611                 }
1612                 if ( $rev->isDeleted( Revision::DELETED_COMMENT ) ) {
1613                         return " <span class=\"history-deleted\">$block</span>";
1614                 }
1615                 return $block;
1616         }
1617
1618         /**
1619          * @param int $size
1620          * @return string
1621          */
1622         public static function formatRevisionSize( $size ) {
1623                 if ( $size == 0 ) {
1624                         $stxt = wfMessage( 'historyempty' )->escaped();
1625                 } else {
1626                         $stxt = wfMessage( 'nbytes' )->numParams( $size )->escaped();
1627                         $stxt = wfMessage( 'parentheses' )->rawParams( $stxt )->escaped();
1628                 }
1629                 return "<span class=\"history-size\">$stxt</span>";
1630         }
1631
1632         /**
1633          * Add another level to the Table of Contents
1634          *
1635          * @return string
1636          */
1637         public static function tocIndent() {
1638                 return "\n<ul>";
1639         }
1640
1641         /**
1642          * Finish one or more sublevels on the Table of Contents
1643          *
1644          * @param int $level
1645          * @return string
1646          */
1647         public static function tocUnindent( $level ) {
1648                 return "</li>\n" . str_repeat( "</ul>\n</li>\n", $level > 0 ? $level : 0 );
1649         }
1650
1651         /**
1652          * parameter level defines if we are on an indentation level
1653          *
1654          * @param string $anchor
1655          * @param string $tocline
1656          * @param string $tocnumber
1657          * @param string $level
1658          * @param string|bool $sectionIndex
1659          * @return string
1660          */
1661         public static function tocLine( $anchor, $tocline, $tocnumber, $level, $sectionIndex = false ) {
1662                 $classes = "toclevel-$level";
1663                 if ( $sectionIndex !== false ) {
1664                         $classes .= " tocsection-$sectionIndex";
1665                 }
1666                 return "\n<li class=\"$classes\"><a href=\"#" .
1667                         $anchor . '"><span class="tocnumber">' .
1668                         $tocnumber . '</span> <span class="toctext">' .
1669                         $tocline . '</span></a>';
1670         }
1671
1672         /**
1673          * End a Table Of Contents line.
1674          * tocUnindent() will be used instead if we're ending a line below
1675          * the new level.
1676          * @return string
1677          */
1678         public static function tocLineEnd() {
1679                 return "</li>\n";
1680         }
1681
1682         /**
1683          * Wraps the TOC in a table and provides the hide/collapse javascript.
1684          *
1685          * @param string $toc Html of the Table Of Contents
1686          * @param string|Language|bool $lang Language for the toc title, defaults to user language
1687          * @return string Full html of the TOC
1688          */
1689         public static function tocList( $toc, $lang = false ) {
1690                 $lang = wfGetLangObj( $lang );
1691                 $title = wfMessage( 'toc' )->inLanguage( $lang )->escaped();
1692
1693                 return '<div id="toc" class="toc">'
1694                         . '<div id="toctitle"><h2>' . $title . "</h2></div>\n"
1695                         . $toc
1696                         . "</ul>\n</div>\n";
1697         }
1698
1699         /**
1700          * Generate a table of contents from a section tree
1701          * Currently unused.
1702          *
1703          * @param array $tree Return value of ParserOutput::getSections()
1704          * @return string HTML fragment
1705          */
1706         public static function generateTOC( $tree ) {
1707                 $toc = '';
1708                 $lastLevel = 0;
1709                 foreach ( $tree as $section ) {
1710                         if ( $section['toclevel'] > $lastLevel ) {
1711                                 $toc .= self::tocIndent();
1712                         } elseif ( $section['toclevel'] < $lastLevel ) {
1713                                 $toc .= self::tocUnindent(
1714                                         $lastLevel - $section['toclevel'] );
1715                         } else {
1716                                 $toc .= self::tocLineEnd();
1717                         }
1718
1719                         $toc .= self::tocLine( $section['anchor'],
1720                                 $section['line'], $section['number'],
1721                                 $section['toclevel'], $section['index'] );
1722                         $lastLevel = $section['toclevel'];
1723                 }
1724                 $toc .= self::tocLineEnd();
1725                 return self::tocList( $toc );
1726         }
1727
1728         /**
1729          * Create a headline for content
1730          *
1731          * @param int $level The level of the headline (1-6)
1732          * @param string $attribs Any attributes for the headline, starting with
1733          *   a space and ending with '>'
1734          *   This *must* be at least '>' for no attribs
1735          * @param string $anchor The anchor to give the headline (the bit after the #)
1736          * @param string $html Html for the text of the header
1737          * @param string $link HTML to add for the section edit link
1738          * @param bool|string $legacyAnchor A second, optional anchor to give for
1739          *   backward compatibility (false to omit)
1740          *
1741          * @return string HTML headline
1742          */
1743         public static function makeHeadline( $level, $attribs, $anchor, $html,
1744                 $link, $legacyAnchor = false
1745         ) {
1746                 $ret = "<h$level$attribs"
1747                         . "<span class=\"mw-headline\" id=\"$anchor\">$html</span>"
1748                         . $link
1749                         . "</h$level>";
1750                 if ( $legacyAnchor !== false ) {
1751                         $ret = "<div id=\"$legacyAnchor\"></div>$ret";
1752                 }
1753                 return $ret;
1754         }
1755
1756         /**
1757          * Split a link trail, return the "inside" portion and the remainder of the trail
1758          * as a two-element array
1759          * @param string $trail
1760          * @return array
1761          */
1762         static function splitTrail( $trail ) {
1763                 global $wgContLang;
1764                 $regex = $wgContLang->linkTrail();
1765                 $inside = '';
1766                 if ( $trail !== '' ) {
1767                         $m = array();
1768                         if ( preg_match( $regex, $trail, $m ) ) {
1769                                 $inside = $m[1];
1770                                 $trail = $m[2];
1771                         }
1772                 }
1773                 return array( $inside, $trail );
1774         }
1775
1776         /**
1777          * Generate a rollback link for a given revision.  Currently it's the
1778          * caller's responsibility to ensure that the revision is the top one. If
1779          * it's not, of course, the user will get an error message.
1780          *
1781          * If the calling page is called with the parameter &bot=1, all rollback
1782          * links also get that parameter. It causes the edit itself and the rollback
1783          * to be marked as "bot" edits. Bot edits are hidden by default from recent
1784          * changes, so this allows sysops to combat a busy vandal without bothering
1785          * other users.
1786          *
1787          * If the option verify is set this function will return the link only in case the
1788          * revision can be reverted. Please note that due to performance limitations
1789          * it might be assumed that a user isn't the only contributor of a page while
1790          * (s)he is, which will lead to useless rollback links. Furthermore this wont
1791          * work if $wgShowRollbackEditCount is disabled, so this can only function
1792          * as an additional check.
1793          *
1794          * If the option noBrackets is set the rollback link wont be enclosed in []
1795          *
1796          * @param Revision $rev
1797          * @param IContextSource $context Context to use or null for the main context.
1798          * @param array $options
1799          * @return string
1800          */
1801         public static function generateRollback( $rev, IContextSource $context = null,
1802                 $options = array( 'verify' )
1803         ) {
1804                 if ( $context === null ) {
1805                         $context = RequestContext::getMain();
1806                 }
1807
1808                 $editCount = false;
1809                 if ( in_array( 'verify', $options ) ) {
1810                         $editCount = self::getRollbackEditCount( $rev, true );
1811                         if ( $editCount === false ) {
1812                                 return '';
1813                         }
1814                 }
1815
1816                 $inner = self::buildRollbackLink( $rev, $context, $editCount );
1817
1818                 if ( !in_array( 'noBrackets', $options ) ) {
1819                         $inner = $context->msg( 'brackets' )->rawParams( $inner )->plain();
1820                 }
1821
1822                 return '<span class="mw-rollback-link">' . $inner . '</span>';
1823         }
1824
1825         /**
1826          * This function will return the number of revisions which a rollback
1827          * would revert and, if $verify is set it will verify that a revision
1828          * can be reverted (that the user isn't the only contributor and the
1829          * revision we might rollback to isn't deleted). These checks can only
1830          * function as an additional check as this function only checks against
1831          * the last $wgShowRollbackEditCount edits.
1832          *
1833          * Returns null if $wgShowRollbackEditCount is disabled or false if $verify
1834          * is set and the user is the only contributor of the page.
1835          *
1836          * @param Revision $rev
1837          * @param bool $verify Try to verify that this revision can really be rolled back
1838          * @return int|bool|null
1839          */
1840         public static function getRollbackEditCount( $rev, $verify ) {
1841                 global $wgShowRollbackEditCount;
1842                 if ( !is_int( $wgShowRollbackEditCount ) || !$wgShowRollbackEditCount > 0 ) {
1843                         // Nothing has happened, indicate this by returning 'null'
1844                         return null;
1845                 }
1846
1847                 $dbr = wfGetDB( DB_SLAVE );
1848
1849                 // Up to the value of $wgShowRollbackEditCount revisions are counted
1850                 $res = $dbr->select(
1851                         'revision',
1852                         array( 'rev_user_text', 'rev_deleted' ),
1853                         // $rev->getPage() returns null sometimes
1854                         array( 'rev_page' => $rev->getTitle()->getArticleID() ),
1855                         __METHOD__,
1856                         array(
1857                                 'USE INDEX' => array( 'revision' => 'page_timestamp' ),
1858                                 'ORDER BY' => 'rev_timestamp DESC',
1859                                 'LIMIT' => $wgShowRollbackEditCount + 1
1860                         )
1861                 );
1862
1863                 $editCount = 0;
1864                 $moreRevs = false;
1865                 foreach ( $res as $row ) {
1866                         if ( $rev->getRawUserText() != $row->rev_user_text ) {
1867                                 if ( $verify &&
1868                                         ( $row->rev_deleted & Revision::DELETED_TEXT
1869                                                 || $row->rev_deleted & Revision::DELETED_USER
1870                                 ) ) {
1871                                         // If the user or the text of the revision we might rollback
1872                                         // to is deleted in some way we can't rollback. Similar to
1873                                         // the sanity checks in WikiPage::commitRollback.
1874                                         return false;
1875                                 }
1876                                 $moreRevs = true;
1877                                 break;
1878                         }
1879                         $editCount++;
1880                 }
1881
1882                 if ( $verify && $editCount <= $wgShowRollbackEditCount && !$moreRevs ) {
1883                         // We didn't find at least $wgShowRollbackEditCount revisions made by the current user
1884                         // and there weren't any other revisions. That means that the current user is the only
1885                         // editor, so we can't rollback
1886                         return false;
1887                 }
1888                 return $editCount;
1889         }
1890
1891         /**
1892          * Build a raw rollback link, useful for collections of "tool" links
1893          *
1894          * @param Revision $rev
1895          * @param IContextSource|null $context Context to use or null for the main context.
1896          * @param int $editCount Number of edits that would be reverted
1897          * @return string HTML fragment
1898          */
1899         public static function buildRollbackLink( $rev, IContextSource $context = null,
1900                 $editCount = false
1901         ) {
1902                 global $wgShowRollbackEditCount, $wgMiserMode;
1903
1904                 // To config which pages are effected by miser mode
1905                 $disableRollbackEditCountSpecialPage = array( 'Recentchanges', 'Watchlist' );
1906
1907                 if ( $context === null ) {
1908                         $context = RequestContext::getMain();
1909                 }
1910
1911                 $title = $rev->getTitle();
1912                 $query = array(
1913                         'action' => 'rollback',
1914                         'from' => $rev->getUserText(),
1915                         'token' => $context->getUser()->getEditToken( array(
1916                                 $title->getPrefixedText(),
1917                                 $rev->getUserText()
1918                         ) ),
1919                 );
1920                 if ( $context->getRequest()->getBool( 'bot' ) ) {
1921                         $query['bot'] = '1';
1922                         $query['hidediff'] = '1'; // bug 15999
1923                 }
1924
1925                 $disableRollbackEditCount = false;
1926                 if ( $wgMiserMode ) {
1927                         foreach ( $disableRollbackEditCountSpecialPage as $specialPage ) {
1928                                 if ( $context->getTitle()->isSpecial( $specialPage ) ) {
1929                                         $disableRollbackEditCount = true;
1930                                         break;
1931                                 }
1932                         }
1933                 }
1934
1935                 if ( !$disableRollbackEditCount
1936                         && is_int( $wgShowRollbackEditCount )
1937                         && $wgShowRollbackEditCount > 0
1938                 ) {
1939                         if ( !is_numeric( $editCount ) ) {
1940                                 $editCount = self::getRollbackEditCount( $rev, false );
1941                         }
1942
1943                         if ( $editCount > $wgShowRollbackEditCount ) {
1944                                 $editCount_output = $context->msg( 'rollbacklinkcount-morethan' )
1945                                         ->numParams( $wgShowRollbackEditCount )->parse();
1946                         } else {
1947                                 $editCount_output = $context->msg( 'rollbacklinkcount' )->numParams( $editCount )->parse();
1948                         }
1949
1950                         return self::link(
1951                                 $title,
1952                                 $editCount_output,
1953                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1954                                 $query,
1955                                 array( 'known', 'noclasses' )
1956                         );
1957                 } else {
1958                         return self::link(
1959                                 $title,
1960                                 $context->msg( 'rollbacklink' )->escaped(),
1961                                 array( 'title' => $context->msg( 'tooltip-rollback' )->text() ),
1962                                 $query,
1963                                 array( 'known', 'noclasses' )
1964                         );
1965                 }
1966         }
1967
1968         /**
1969          * Returns HTML for the "templates used on this page" list.
1970          *
1971          * Make an HTML list of templates, and then add a "More..." link at
1972          * the bottom. If $more is null, do not add a "More..." link. If $more
1973          * is a Title, make a link to that title and use it. If $more is a string,
1974          * directly paste it in as the link (escaping needs to be done manually).
1975          * Finally, if $more is a Message, call toString().
1976          *
1977          * @param array $templates Array of templates from Article::getUsedTemplate or similar
1978          * @param bool $preview Whether this is for a preview
1979          * @param bool $section Whether this is for a section edit
1980          * @param Title|Message|string|null $more An escaped link for "More..." of the templates
1981          * @return string HTML output
1982          */
1983         public static function formatTemplates( $templates, $preview = false,
1984                 $section = false, $more = null
1985         ) {
1986                 global $wgLang;
1987                 wfProfileIn( __METHOD__ );
1988
1989                 $outText = '';
1990                 if ( count( $templates ) > 0 ) {
1991                         # Do a batch existence check
1992                         $batch = new LinkBatch;
1993                         foreach ( $templates as $title ) {
1994                                 $batch->addObj( $title );
1995                         }
1996                         $batch->execute();
1997
1998                         # Construct the HTML
1999                         $outText = '<div class="mw-templatesUsedExplanation">';
2000                         if ( $preview ) {
2001                                 $outText .= wfMessage( 'templatesusedpreview' )->numParams( count( $templates ) )
2002                                         ->parseAsBlock();
2003                         } elseif ( $section ) {
2004                                 $outText .= wfMessage( 'templatesusedsection' )->numParams( count( $templates ) )
2005                                         ->parseAsBlock();
2006                         } else {
2007                                 $outText .= wfMessage( 'templatesused' )->numParams( count( $templates ) )
2008                                         ->parseAsBlock();
2009                         }
2010                         $outText .= "</div><ul>\n";
2011
2012                         usort( $templates, 'Title::compare' );
2013                         foreach ( $templates as $titleObj ) {
2014                                 $protected = '';
2015                                 $restrictions = $titleObj->getRestrictions( 'edit' );
2016                                 if ( $restrictions ) {
2017                                         // Check backwards-compatible messages
2018                                         $msg = null;
2019                                         if ( $restrictions === array( 'sysop' ) ) {
2020                                                 $msg = wfMessage( 'template-protected' );
2021                                         } elseif ( $restrictions === array( 'autoconfirmed' ) ) {
2022                                                 $msg = wfMessage( 'template-semiprotected' );
2023                                         }
2024                                         if ( $msg && !$msg->isDisabled() ) {
2025                                                 $protected = $msg->parse();
2026                                         } else {
2027                                                 // Construct the message from restriction-level-*
2028                                                 // e.g. restriction-level-sysop, restriction-level-autoconfirmed
2029                                                 $msgs = array();
2030                                                 foreach ( $restrictions as $r ) {
2031                                                         $msgs[] = wfMessage( "restriction-level-$r" )->parse();
2032                                                 }
2033                                                 $protected = wfMessage( 'parentheses' )
2034                                                         ->rawParams( $wgLang->commaList( $msgs ) )->escaped();
2035                                         }
2036                                 }
2037                                 if ( $titleObj->quickUserCan( 'edit' ) ) {
2038                                         $editLink = self::link(
2039                                                 $titleObj,
2040                                                 wfMessage( 'editlink' )->text(),
2041                                                 array(),
2042                                                 array( 'action' => 'edit' )
2043                                         );
2044                                 } else {
2045                                         $editLink = self::link(
2046                                                 $titleObj,
2047                                                 wfMessage( 'viewsourcelink' )->text(),
2048                                                 array(),
2049                                                 array( 'action' => 'edit' )
2050                                         );
2051                                 }
2052                                 $outText .= '<li>' . self::link( $titleObj )
2053                                         . wfMessage( 'word-separator' )->escaped()
2054                                         . wfMessage( 'parentheses' )->rawParams( $editLink )->escaped()
2055                                         . wfMessage( 'word-separator' )->escaped()
2056                                         . $protected . '</li>';
2057                         }
2058
2059                         if ( $more instanceof Title ) {
2060                                 $outText .= '<li>' . self::link( $more, wfMessage( 'moredotdotdot' ) ) . '</li>';
2061                         } elseif ( $more ) {
2062                                 $outText .= "<li>$more</li>";
2063                         }
2064
2065                         $outText .= '</ul>';
2066                 }
2067                 wfProfileOut( __METHOD__ );
2068                 return $outText;
2069         }
2070
2071         /**
2072          * Returns HTML for the "hidden categories on this page" list.
2073          *
2074          * @param array $hiddencats Array of hidden categories from Article::getHiddenCategories
2075          *   or similar
2076          * @return string HTML output
2077          */
2078         public static function formatHiddenCategories( $hiddencats ) {
2079                 wfProfileIn( __METHOD__ );
2080
2081                 $outText = '';
2082                 if ( count( $hiddencats ) > 0 ) {
2083                         # Construct the HTML
2084                         $outText = '<div class="mw-hiddenCategoriesExplanation">';
2085                         $outText .= wfMessage( 'hiddencategories' )->numParams( count( $hiddencats ) )->parseAsBlock();
2086                         $outText .= "</div><ul>\n";
2087
2088                         foreach ( $hiddencats as $titleObj ) {
2089                                 # If it's hidden, it must exist - no need to check with a LinkBatch
2090                                 $outText .= '<li>'
2091                                         . self::link( $titleObj, null, array(), array(), 'known' )
2092                                         . "</li>\n";
2093                         }
2094                         $outText .= '</ul>';
2095                 }
2096                 wfProfileOut( __METHOD__ );
2097                 return $outText;
2098         }
2099
2100         /**
2101          * Format a size in bytes for output, using an appropriate
2102          * unit (B, KB, MB or GB) according to the magnitude in question
2103          *
2104          * @param int $size Size to format
2105          * @return string
2106          */
2107         public static function formatSize( $size ) {
2108                 global $wgLang;
2109                 return htmlspecialchars( $wgLang->formatSize( $size ) );
2110         }
2111
2112         /**
2113          * Given the id of an interface element, constructs the appropriate title
2114          * attribute from the system messages.  (Note, this is usually the id but
2115          * isn't always, because sometimes the accesskey needs to go on a different
2116          * element than the id, for reverse-compatibility, etc.)
2117          *
2118          * @param string $name Id of the element, minus prefixes.
2119          * @param string|null $options Null or the string 'withaccess' to add an access-
2120          *   key hint
2121          * @return string Contents of the title attribute (which you must HTML-
2122          *   escape), or false for no title attribute
2123          */
2124         public static function titleAttrib( $name, $options = null ) {
2125                 wfProfileIn( __METHOD__ );
2126
2127                 $message = wfMessage( "tooltip-$name" );
2128
2129                 if ( !$message->exists() ) {
2130                         $tooltip = false;
2131                 } else {
2132                         $tooltip = $message->text();
2133                         # Compatibility: formerly some tooltips had [alt-.] hardcoded
2134                         $tooltip = preg_replace( "/ ?\[alt-.\]$/", '', $tooltip );
2135                         # Message equal to '-' means suppress it.
2136                         if ( $tooltip == '-' ) {
2137                                 $tooltip = false;
2138                         }
2139                 }
2140
2141                 if ( $options == 'withaccess' ) {
2142                         $accesskey = self::accesskey( $name );
2143                         if ( $accesskey !== false ) {
2144                                 // Should be build the same as in jquery.accessKeyLabel.js
2145                                 if ( $tooltip === false || $tooltip === '' ) {
2146                                         $tooltip = wfMessage( 'brackets', $accesskey )->text();
2147                                 } else {
2148                                         $tooltip .= wfMessage( 'word-separator' )->text();
2149                                         $tooltip .= wfMessage( 'brackets', $accesskey )->text();
2150                                 }
2151                         }
2152                 }
2153
2154                 wfProfileOut( __METHOD__ );
2155                 return $tooltip;
2156         }
2157
2158         private static $accesskeycache;
2159
2160         /**
2161          * Given the id of an interface element, constructs the appropriate
2162          * accesskey attribute from the system messages.  (Note, this is usually
2163          * the id but isn't always, because sometimes the accesskey needs to go on
2164          * a different element than the id, for reverse-compatibility, etc.)
2165          *
2166          * @param string $name Id of the element, minus prefixes.
2167          * @return string Contents of the accesskey attribute (which you must HTML-
2168          *   escape), or false for no accesskey attribute
2169          */
2170         public static function accesskey( $name ) {
2171                 if ( isset( self::$accesskeycache[$name] ) ) {
2172                         return self::$accesskeycache[$name];
2173                 }
2174                 wfProfileIn( __METHOD__ );
2175
2176                 $message = wfMessage( "accesskey-$name" );
2177
2178                 if ( !$message->exists() ) {
2179                         $accesskey = false;
2180                 } else {
2181                         $accesskey = $message->plain();
2182                         if ( $accesskey === '' || $accesskey === '-' ) {
2183                                 # @todo FIXME: Per standard MW behavior, a value of '-' means to suppress the
2184                                 # attribute, but this is broken for accesskey: that might be a useful
2185                                 # value.
2186                                 $accesskey = false;
2187                         }
2188                 }
2189
2190                 wfProfileOut( __METHOD__ );
2191                 self::$accesskeycache[$name] = $accesskey;
2192                 return self::$accesskeycache[$name];
2193         }
2194
2195         /**
2196          * Get a revision-deletion link, or disabled link, or nothing, depending
2197          * on user permissions & the settings on the revision.
2198          *
2199          * Will use forward-compatible revision ID in the Special:RevDelete link
2200          * if possible, otherwise the timestamp-based ID which may break after
2201          * undeletion.
2202          *
2203          * @param User $user
2204          * @param Revision $rev
2205          * @param Revision $title
2206          * @return string HTML fragment
2207          */
2208         public static function getRevDeleteLink( User $user, Revision $rev, Title $title ) {
2209                 $canHide = $user->isAllowed( 'deleterevision' );
2210                 if ( !$canHide && !( $rev->getVisibility() && $user->isAllowed( 'deletedhistory' ) ) ) {
2211                         return '';
2212                 }
2213
2214                 if ( !$rev->userCan( Revision::DELETED_RESTRICTED, $user ) ) {
2215                         return Linker::revDeleteLinkDisabled( $canHide ); // revision was hidden from sysops
2216                 } else {
2217                         if ( $rev->getId() ) {
2218                                 // RevDelete links using revision ID are stable across
2219                                 // page deletion and undeletion; use when possible.
2220                                 $query = array(
2221                                         'type' => 'revision',
2222                                         'target' => $title->getPrefixedDBkey(),
2223                                         'ids' => $rev->getId()
2224                                 );
2225                         } else {
2226                                 // Older deleted entries didn't save a revision ID.
2227                                 // We have to refer to these by timestamp, ick!
2228                                 $query = array(
2229                                         'type' => 'archive',
2230                                         'target' => $title->getPrefixedDBkey(),
2231                                         'ids' => $rev->getTimestamp()
2232                                 );
2233                         }
2234                         return Linker::revDeleteLink( $query,
2235                                 $rev->isDeleted( Revision::DELETED_RESTRICTED ), $canHide );
2236                 }
2237         }
2238
2239         /**
2240          * Creates a (show/hide) link for deleting revisions/log entries
2241          *
2242          * @param array $query Query parameters to be passed to link()
2243          * @param bool $restricted Set to true to use a "<strong>" instead of a "<span>"
2244          * @param bool $delete Set to true to use (show/hide) rather than (show)
2245          *
2246          * @return string HTML "<a>" link to Special:Revisiondelete, wrapped in a
2247          * span to allow for customization of appearance with CSS
2248          */
2249         public static function revDeleteLink( $query = array(), $restricted = false, $delete = true ) {
2250                 $sp = SpecialPage::getTitleFor( 'Revisiondelete' );
2251                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2252                 $html = wfMessage( $msgKey )->escaped();
2253                 $tag = $restricted ? 'strong' : 'span';
2254                 $link = self::link( $sp, $html, array(), $query, array( 'known', 'noclasses' ) );
2255                 return Xml::tags(
2256                         $tag,
2257                         array( 'class' => 'mw-revdelundel-link' ),
2258                         wfMessage( 'parentheses' )->rawParams( $link )->escaped()
2259                 );
2260         }
2261
2262         /**
2263          * Creates a dead (show/hide) link for deleting revisions/log entries
2264          *
2265          * @param bool $delete Set to true to use (show/hide) rather than (show)
2266          *
2267          * @return string HTML text wrapped in a span to allow for customization
2268          * of appearance with CSS
2269          */
2270         public static function revDeleteLinkDisabled( $delete = true ) {
2271                 $msgKey = $delete ? 'rev-delundel' : 'rev-showdeleted';
2272                 $html = wfMessage( $msgKey )->escaped();
2273                 $htmlParentheses = wfMessage( 'parentheses' )->rawParams( $html )->escaped();
2274                 return Xml::tags( 'span', array( 'class' => 'mw-revdelundel-link' ), $htmlParentheses );
2275         }
2276
2277         /* Deprecated methods */
2278
2279         /**
2280          * @deprecated since 1.16 Use link(); warnings since 1.21
2281          *
2282          * Make a link for a title which may or may not be in the database. If you need to
2283          * call this lots of times, pre-fill the link cache with a LinkBatch, otherwise each
2284          * call to this will result in a DB query.
2285          *
2286          * @param Title $nt The title object to make the link from, e.g. from Title::newFromText.
2287          * @param string $text Link text
2288          * @param string $query Optional query part
2289          * @param string $trail Optional trail. Alphabetic characters at the start of this string will
2290          *   be included in the link text. Other characters will be appended after
2291          *   the end of the link.
2292          * @param string $prefix Optional prefix. As trail, only before instead of after.
2293          * @return string
2294          */
2295         static function makeLinkObj( $nt, $text = '', $query = '', $trail = '', $prefix = '' ) {
2296                 wfDeprecated( __METHOD__, '1.21' );
2297
2298                 wfProfileIn( __METHOD__ );
2299                 $query = wfCgiToArray( $query );
2300                 list( $inside, $trail ) = self::splitTrail( $trail );
2301                 if ( $text === '' ) {
2302                         $text = self::linkText( $nt );
2303                 }
2304
2305                 $ret = self::link( $nt, "$prefix$text$inside", array(), $query ) . $trail;
2306
2307                 wfProfileOut( __METHOD__ );
2308                 return $ret;
2309         }
2310
2311         /**
2312          * @deprecated since 1.16 Use link(); warnings since 1.21
2313          *
2314          * Make a link for a title which definitely exists. This is faster than makeLinkObj because
2315          * it doesn't have to do a database query. It's also valid for interwiki titles and special
2316          * pages.
2317          *
2318          * @param Title $title Title object of target page
2319          * @param string $text Text to replace the title
2320          * @param string $query Link target
2321          * @param string $trail Text after link
2322          * @param string $prefix Text before link text
2323          * @param string $aprops Extra attributes to the a-element
2324          * @param string $style Style to apply - if empty, use getInternalLinkAttributesObj instead
2325          * @return string The a-element
2326          */
2327         static function makeKnownLinkObj(
2328                 $title, $text = '', $query = '', $trail = '', $prefix = '', $aprops = '', $style = ''
2329         ) {
2330                 wfDeprecated( __METHOD__, '1.21' );
2331
2332                 wfProfileIn( __METHOD__ );
2333
2334                 if ( $text == '' ) {
2335                         $text = self::linkText( $title );
2336                 }
2337                 $attribs = Sanitizer::mergeAttributes(
2338                         Sanitizer::decodeTagAttributes( $aprops ),
2339                         Sanitizer::decodeTagAttributes( $style )
2340                 );
2341                 $query = wfCgiToArray( $query );
2342                 list( $inside, $trail ) = self::splitTrail( $trail );
2343
2344                 $ret = self::link( $title, "$prefix$text$inside", $attribs, $query,
2345                         array( 'known', 'noclasses' ) ) . $trail;
2346
2347                 wfProfileOut( __METHOD__ );
2348                 return $ret;
2349         }
2350
2351         /**
2352          * Returns the attributes for the tooltip and access key.
2353          * @param string $name
2354          * @return array
2355          */
2356         public static function tooltipAndAccesskeyAttribs( $name ) {
2357                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2358                 # no attribute" instead of "output '' as value for attribute", this
2359                 # would be three lines.
2360                 $attribs = array(
2361                         'title' => self::titleAttrib( $name, 'withaccess' ),
2362                         'accesskey' => self::accesskey( $name )
2363                 );
2364                 if ( $attribs['title'] === false ) {
2365                         unset( $attribs['title'] );
2366                 }
2367                 if ( $attribs['accesskey'] === false ) {
2368                         unset( $attribs['accesskey'] );
2369                 }
2370                 return $attribs;
2371         }
2372
2373         /**
2374          * Returns raw bits of HTML, use titleAttrib()
2375          * @param string $name
2376          * @param array|null $options
2377          * @return null|string
2378          */
2379         public static function tooltip( $name, $options = null ) {
2380                 # @todo FIXME: If Sanitizer::expandAttributes() treated "false" as "output
2381                 # no attribute" instead of "output '' as value for attribute", this
2382                 # would be two lines.
2383                 $tooltip = self::titleAttrib( $name, $options );
2384                 if ( $tooltip === false ) {
2385                         return '';
2386                 }
2387                 return Xml::expandAttributes( array(
2388                         'title' => $tooltip
2389                 ) );
2390         }
2391 }
2392
2393 /**
2394  * @since 1.18
2395  */
2396 class DummyLinker {
2397
2398         /**
2399          * Use PHP's magic __call handler to transform instance calls to a dummy instance
2400          * into static calls to the new Linker for backwards compatibility.
2401          *
2402          * @param string $fname Name of called method
2403          * @param array $args Arguments to the method
2404          * @return mixed
2405          */
2406         public function __call( $fname, $args ) {
2407                 return call_user_func_array( array( 'Linker', $fname ), $args );
2408         }
2409 }