includes/Message.php

   1 <?php
   2 /**
   3  * Fetching and processing of interface messages.
   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  * @author Niklas Laxström
  22  */
  23
  24 /**
  25  * The Message class provides methods which fulfil two basic services:
  26  *  - fetching interface messages
  27  *  - processing messages into a variety of formats
  28  *
  29  * First implemented with MediaWiki 1.17, the Message class is intended to
  30  * replace the old wfMsg* functions that over time grew unusable.
  31  * @see https://www.mediawiki.org/wiki/Manual:Messages_API for equivalences
  32  * between old and new functions.
  33  *
  34  * You should use the wfMessage() global function which acts as a wrapper for
  35  * the Message class. The wrapper let you pass parameters as arguments.
  36  *
  37  * The most basic usage cases would be:
  38  *
  39  * @code
  40  *     // Initialize a Message object using the 'some_key' message key
  41  *     $message = wfMessage( 'some_key' );
  42  *
  43  *     // Using two parameters those values are strings 'value1' and 'value2':
  44  *     $message = wfMessage( 'some_key',
  45  *          'value1', 'value2'
  46  *     );
  47  * @endcode
  48  *
  49  * @section message_global_fn Global function wrapper:
  50  *
  51  * Since wfMessage() returns a Message instance, you can chain its call with
  52  * a method. Some of them return a Message instance too so you can chain them.
  53  * You will find below several examples of wfMessage() usage.
  54  *
  55  * Fetching a message text for interface message:
  56  *
  57  * @code
  58  *    $button = Xml::button(
  59  *         wfMessage( 'submit' )->text()
  60  *    );
  61  * @endcode
  62  *
  63  * A Message instance can be passed parameters after it has been constructed,
  64  * use the params() method to do so:
  65  *
  66  * @code
  67  *     wfMessage( 'welcome-to' )
  68  *         ->params( $wgSitename )
  69  *         ->text();
  70  * @endcode
  71  *
  72  * {{GRAMMAR}} and friends work correctly:
  73  *
  74  * @code
  75  *    wfMessage( 'are-friends',
  76  *        $user, $friend
  77  *    );
  78  *    wfMessage( 'bad-message' )
  79  *         ->rawParams( '<script>...</script>' )
  80  *         ->escaped();
  81  * @endcode
  82  *
  83  * @section message_language Changing language:
  84  *
  85  * Messages can be requested in a different language or in whatever current
  86  * content language is being used. The methods are:
  87  *     - Message->inContentLanguage()
  88  *     - Message->inLanguage()
  89  *
  90  * Sometimes the message text ends up in the database, so content language is
  91  * needed:
  92  *
  93  * @code
  94  *    wfMessage( 'file-log',
  95  *        $user, $filename
  96  *    )->inContentLanguage()->text();
  97  * @endcode
  98  *
  99  * Checking whether a message exists:
 100  *
 101  * @code
 102  *    wfMessage( 'mysterious-message' )->exists()
 103  *    // returns a boolean whether the 'mysterious-message' key exist.
 104  * @endcode
 105  *
 106  * If you want to use a different language:
 107  *
 108  * @code
 109  *    $userLanguage = $user->getOption( 'language' );
 110  *    wfMessage( 'email-header' )
 111  *         ->inLanguage( $userLanguage )
 112  *         ->plain();
 113  * @endcode
 114  *
 115  * @note You can parse the text only in the content or interface languages
 116  *
 117  * @section message_compare_old Comparison with old wfMsg* functions:
 118  *
 119  * Use full parsing:
 120  *
 121  * @code
 122  *     // old style:
 123  *     wfMsgExt( 'key', [ 'parseinline' ], 'apple' );
 124  *     // new style:
 125  *     wfMessage( 'key', 'apple' )->parse();
 126  * @endcode
 127  *
 128  * Parseinline is used because it is more useful when pre-building HTML.
 129  * In normal use it is better to use OutputPage::(add|wrap)WikiMsg.
 130  *
 131  * Places where HTML cannot be used. {{-transformation is done.
 132  * @code
 133  *     // old style:
 134  *     wfMsgExt( 'key', [ 'parsemag' ], 'apple', 'pear' );
 135  *     // new style:
 136  *     wfMessage( 'key', 'apple', 'pear' )->text();
 137  * @endcode
 138  *
 139  * Shortcut for escaping the message too, similar to wfMsgHTML(), but
 140  * parameters are not replaced after escaping by default.
 141  * @code
 142  *     $escaped = wfMessage( 'key' )
 143  *          ->rawParams( 'apple' )
 144  *          ->escaped();
 145  * @endcode
 146  *
 147  * @section message_appendix Appendix:
 148  *
 149  * @todo
 150  * - test, can we have tests?
 151  * - this documentation needs to be extended
 152  *
 153  * @see https://www.mediawiki.org/wiki/WfMessage()
 154  * @see https://www.mediawiki.org/wiki/New_messages_API
 155  * @see https://www.mediawiki.org/wiki/Localisation
 156  *
 157  * @since 1.17
 158  */
 159 class Message implements MessageSpecifier, Serializable {
 160         /** Use message text as-is */
 161         const FORMAT_PLAIN = 'plain';
 162         /** Use normal wikitext -> HTML parsing (the result will be wrapped in a block-level HTML tag) */
 163         const FORMAT_BLOCK_PARSE = 'block-parse';
 164         /** Use normal wikitext -> HTML parsing but strip the block-level wrapper */
 165         const FORMAT_PARSE = 'parse';
 166         /** Transform {{..}} constructs but don't transform to HTML */
 167         const FORMAT_TEXT = 'text';
 168         /** Transform {{..}} constructs, HTML-escape the result */
 169         const FORMAT_ESCAPED = 'escaped';
 170
 171         /**
 172          * Mapping from Message::listParam() types to Language methods.
 173          * @var array
 174          */
 175         protected static $listTypeMap = [
 176                 'comma' => 'commaList',
 177                 'semicolon' => 'semicolonList',
 178                 'pipe' => 'pipeList',
 179                 'text' => 'listToText',
 180         ];
 181
 182         /**
 183          * In which language to get this message. True, which is the default,
 184          * means the current user language, false content language.
 185          *
 186          * @var bool
 187          */
 188         protected $interface = true;
 189
 190         /**
 191          * In which language to get this message. Overrides the $interface setting.
 192          *
 193          * @var Language|bool Explicit language object, or false for user language
 194          */
 195         protected $language = false;
 196
 197         /**
 198          * @var string The message key. If $keysToTry has more than one element,
 199          * this may change to one of the keys to try when fetching the message text.
 200          */
 201         protected $key;
 202
 203         /**
 204          * @var string[] List of keys to try when fetching the message.
 205          */
 206         protected $keysToTry;
 207
 208         /**
 209          * @var array List of parameters which will be substituted into the message.
 210          */
 211         protected $parameters = [];
 212
 213         /**
 214          * @var string
 215          * @deprecated
 216          */
 217         protected $format = 'parse';
 218
 219         /**
 220          * @var bool Whether database can be used.
 221          */
 222         protected $useDatabase = true;
 223
 224         /**
 225          * @var Title Title object to use as context.
 226          */
 227         protected $title = null;
 228
 229         /**
 230          * @var Content Content object representing the message.
 231          */
 232         protected $content = null;
 233
 234         /**
 235          * @var string
 236          */
 237         protected $message;
 238
 239         /**
 240          * @since 1.17
 241          * @param string|string[]|MessageSpecifier $key Message key, or array of
 242          * message keys to try and use the first non-empty message for, or a
 243          * MessageSpecifier to copy from.
 244          * @param array $params Message parameters.
 245          * @param Language $language [optional] Language to use (defaults to current user language).
 246          * @throws InvalidArgumentException
 247          */
 248         public function __construct( $key, $params = [], Language $language = null ) {
 249                 if ( $key instanceof MessageSpecifier ) {
 250                         if ( $params ) {
 251                                 throw new InvalidArgumentException(
 252                                         '$params must be empty if $key is a MessageSpecifier'
 253                                 );
 254                         }
 255                         $params = $key->getParams();
 256                         $key = $key->getKey();
 257                 }
 258
 259                 if ( !is_string( $key ) && !is_array( $key ) ) {
 260                         throw new InvalidArgumentException( '$key must be a string or an array' );
 261                 }
 262
 263                 $this->keysToTry = (array)$key;
 264
 265                 if ( empty( $this->keysToTry ) ) {
 266                         throw new InvalidArgumentException( '$key must not be an empty list' );
 267                 }
 268
 269                 $this->key = reset( $this->keysToTry );
 270
 271                 $this->parameters = array_values( $params );
 272                 // User language is only resolved in getLanguage(). This helps preserve the
 273                 // semantic intent of "user language" across serialize() and unserialize().
 274                 $this->language = $language ?: false;
 275         }
 276
 277         /**
 278          * @see Serializable::serialize()
 279          * @since 1.26
 280          * @return string
 281          */
 282         public function serialize() {
 283                 return serialize( [
 284                         'interface' => $this->interface,
 285                         'language' => $this->language ? $this->language->getCode() : false,
 286                         'key' => $this->key,
 287                         'keysToTry' => $this->keysToTry,
 288                         'parameters' => $this->parameters,
 289                         'format' => $this->format,
 290                         'useDatabase' => $this->useDatabase,
 291                         'title' => $this->title,
 292                 ] );
 293         }
 294
 295         /**
 296          * @see Serializable::unserialize()
 297          * @since 1.26
 298          * @param string $serialized
 299          */
 300         public function unserialize( $serialized ) {
 301                 $data = unserialize( $serialized );
 302                 $this->interface = $data['interface'];
 303                 $this->key = $data['key'];
 304                 $this->keysToTry = $data['keysToTry'];
 305                 $this->parameters = $data['parameters'];
 306                 $this->format = $data['format'];
 307                 $this->useDatabase = $data['useDatabase'];
 308                 $this->language = $data['language'] ? Language::factory( $data['language'] ) : false;
 309                 $this->title = $data['title'];
 310         }
 311
 312         /**
 313          * @since 1.24
 314          *
 315          * @return bool True if this is a multi-key message, that is, if the key provided to the
 316          * constructor was a fallback list of keys to try.
 317          */
 318         public function isMultiKey() {
 319                 return count( $this->keysToTry ) > 1;
 320         }
 321
 322         /**
 323          * @since 1.24
 324          *
 325          * @return string[] The list of keys to try when fetching the message text,
 326          * in order of preference.
 327          */
 328         public function getKeysToTry() {
 329                 return $this->keysToTry;
 330         }
 331
 332         /**
 333          * Returns the message key.
 334          *
 335          * If a list of multiple possible keys was supplied to the constructor, this method may
 336          * return any of these keys. After the message has been fetched, this method will return
 337          * the key that was actually used to fetch the message.
 338          *
 339          * @since 1.21
 340          *
 341          * @return string
 342          */
 343         public function getKey() {
 344                 return $this->key;
 345         }
 346
 347         /**
 348          * Returns the message parameters.
 349          *
 350          * @since 1.21
 351          *
 352          * @return array
 353          */
 354         public function getParams() {
 355                 return $this->parameters;
 356         }
 357
 358         /**
 359          * Returns the message format.
 360          *
 361          * @since 1.21
 362          *
 363          * @return string
 364          * @deprecated since 1.29 formatting is not stateful
 365          */
 366         public function getFormat() {
 367                 wfDeprecated( __METHOD__, '1.29' );
 368                 return $this->format;
 369         }
 370
 371         /**
 372          * Returns the Language of the Message.
 373          *
 374          * @since 1.23
 375          *
 376          * @return Language
 377          */
 378         public function getLanguage() {
 379                 // Defaults to false which means current user language
 380                 return $this->language ?: RequestContext::getMain()->getLanguage();
 381         }
 382
 383         /**
 384          * Factory function that is just wrapper for the real constructor. It is
 385          * intended to be used instead of the real constructor, because it allows
 386          * chaining method calls, while new objects don't.
 387          *
 388          * @since 1.17
 389          *
 390          * @param string|string[]|MessageSpecifier $key
 391          * @param mixed $param,... Parameters as strings.
 392          *
 393          * @return Message
 394          */
 395         public static function newFromKey( $key /*...*/ ) {
 396                 $params = func_get_args();
 397                 array_shift( $params );
 398                 return new self( $key, $params );
 399         }
 400
 401         /**
 402          * Transform a MessageSpecifier or a primitive value used interchangeably with
 403          * specifiers (a message key string, or a key + params array) into a proper Message.
 404          *
 405          * Also accepts a MessageSpecifier inside an array: that's not considered a valid format
 406          * but is an easy error to make due to how StatusValue stores messages internally.
 407          * Further array elements are ignored in that case.
 408          *
 409          * @param string|array|MessageSpecifier $value
 410          * @return Message
 411          * @throws InvalidArgumentException
 412          * @since 1.27
 413          */
 414         public static function newFromSpecifier( $value ) {
 415                 $params = [];
 416                 if ( is_array( $value ) ) {
 417                         $params = $value;
 418                         $value = array_shift( $params );
 419                 }
 420
 421                 if ( $value instanceof Message ) { // Message, RawMessage, ApiMessage, etc
 422                         $message = clone $value;
 423                 } elseif ( $value instanceof MessageSpecifier ) {
 424                         $message = new Message( $value );
 425                 } elseif ( is_string( $value ) ) {
 426                         $message = new Message( $value, $params );
 427                 } else {
 428                         throw new InvalidArgumentException( __METHOD__ . ': invalid argument type '
 429                                 . gettype( $value ) );
 430                 }
 431
 432                 return $message;
 433         }
 434
 435         /**
 436          * Factory function accepting multiple message keys and returning a message instance
 437          * for the first message which is non-empty. If all messages are empty then an
 438          * instance of the first message key is returned.
 439          *
 440          * @since 1.18
 441          *
 442          * @param string|string[] $keys,... Message keys, or first argument as an array of all the
 443          * message keys.
 444          *
 445          * @return Message
 446          */
 447         public static function newFallbackSequence( /*...*/ ) {
 448                 $keys = func_get_args();
 449                 if ( func_num_args() == 1 ) {
 450                         if ( is_array( $keys[0] ) ) {
 451                                 // Allow an array to be passed as the first argument instead
 452                                 $keys = array_values( $keys[0] );
 453                         } else {
 454                                 // Optimize a single string to not need special fallback handling
 455                                 $keys = $keys[0];
 456                         }
 457                 }
 458                 return new self( $keys );
 459         }
 460
 461         /**
 462          * Get a title object for a mediawiki message, where it can be found in the mediawiki namespace.
 463          * The title will be for the current language, if the message key is in
 464          * $wgForceUIMsgAsContentMsg it will be append with the language code (except content
 465          * language), because Message::inContentLanguage will also return in user language.
 466          *
 467          * @see $wgForceUIMsgAsContentMsg
 468          * @return Title
 469          * @since 1.26
 470          */
 471         public function getTitle() {
 472                 global $wgContLang, $wgForceUIMsgAsContentMsg;
 473
 474                 $title = $this->key;
 475                 if (
 476                         !$this->language->equals( $wgContLang )
 477                         && in_array( $this->key, (array)$wgForceUIMsgAsContentMsg )
 478                 ) {
 479                         $code = $this->language->getCode();
 480                         $title .= '/' . $code;
 481                 }
 482
 483                 return Title::makeTitle( NS_MEDIAWIKI, $wgContLang->ucfirst( strtr( $title, ' ', '_' ) ) );
 484         }
 485
 486         /**
 487          * Adds parameters to the parameter list of this message.
 488          *
 489          * @since 1.17
 490          *
 491          * @param mixed $args,... Parameters as strings or arrays from
 492          *  Message::numParam() and the like, or a single array of parameters.
 493          *
 494          * @return Message $this
 495          */
 496         public function params( /*...*/ ) {
 497                 $args = func_get_args();
 498
 499                 // If $args has only one entry and it's an array, then it's either a
 500                 // non-varargs call or it happens to be a call with just a single
 501                 // "special" parameter. Since the "special" parameters don't have any
 502                 // numeric keys, we'll test that to differentiate the cases.
 503                 if ( count( $args ) === 1 && isset( $args[0] ) && is_array( $args[0] ) ) {
 504                         if ( $args[0] === [] ) {
 505                                 $args = [];
 506                         } else {
 507                                 foreach ( $args[0] as $key => $value ) {
 508                                         if ( is_int( $key ) ) {
 509                                                 $args = $args[0];
 510                                                 break;
 511                                         }
 512                                 }
 513                         }
 514                 }
 515
 516                 $this->parameters = array_merge( $this->parameters, array_values( $args ) );
 517                 return $this;
 518         }
 519
 520         /**
 521          * Add parameters that are substituted after parsing or escaping.
 522          * In other words the parsing process cannot access the contents
 523          * of this type of parameter, and you need to make sure it is
 524          * sanitized beforehand.  The parser will see "$n", instead.
 525          *
 526          * @since 1.17
 527          *
 528          * @param mixed $params,... Raw parameters as strings, or a single argument that is
 529          * an array of raw parameters.
 530          *
 531          * @return Message $this
 532          */
 533         public function rawParams( /*...*/ ) {
 534                 $params = func_get_args();
 535                 if ( isset( $params[0] ) && is_array( $params[0] ) ) {
 536                         $params = $params[0];
 537                 }
 538                 foreach ( $params as $param ) {
 539                         $this->parameters[] = self::rawParam( $param );
 540                 }
 541                 return $this;
 542         }
 543
 544         /**
 545          * Add parameters that are numeric and will be passed through
 546          * Language::formatNum before substitution
 547          *
 548          * @since 1.18
 549          *
 550          * @param mixed $param,... Numeric parameters, or a single argument that is
 551          * an array of numeric parameters.
 552          *
 553          * @return Message $this
 554          */
 555         public function numParams( /*...*/ ) {
 556                 $params = func_get_args();
 557                 if ( isset( $params[0] ) && is_array( $params[0] ) ) {
 558                         $params = $params[0];
 559                 }
 560                 foreach ( $params as $param ) {
 561                         $this->parameters[] = self::numParam( $param );
 562                 }
 563                 return $this;
 564         }
 565
 566         /**
 567          * Add parameters that are durations of time and will be passed through
 568          * Language::formatDuration before substitution
 569          *
 570          * @since 1.22
 571          *
 572          * @param int|int[] $param,... Duration parameters, or a single argument that is
 573          * an array of duration parameters.
 574          *
 575          * @return Message $this
 576          */
 577         public function durationParams( /*...*/ ) {
 578                 $params = func_get_args();
 579                 if ( isset( $params[0] ) && is_array( $params[0] ) ) {
 580                         $params = $params[0];
 581                 }
 582                 foreach ( $params as $param ) {
 583                         $this->parameters[] = self::durationParam( $param );
 584                 }
 585                 return $this;
 586         }
 587
 588         /**
 589          * Add parameters that are expiration times and will be passed through
 590          * Language::formatExpiry before substitution
 591          *
 592          * @since 1.22
 593          *
 594          * @param string|string[] $param,... Expiry parameters, or a single argument that is
 595          * an array of expiry parameters.
 596          *
 597          * @return Message $this
 598          */
 599         public function expiryParams( /*...*/ ) {
 600                 $params = func_get_args();
 601                 if ( isset( $params[0] ) && is_array( $params[0] ) ) {
 602                         $params = $params[0];
 603                 }
 604                 foreach ( $params as $param ) {
 605                         $this->parameters[] = self::expiryParam( $param );
 606                 }
 607                 return $this;
 608         }
 609
 610         /**
 611          * Add parameters that are time periods and will be passed through
 612          * Language::formatTimePeriod before substitution
 613          *
 614          * @since 1.22
 615          *
 616          * @param int|int[] $param,... Time period parameters, or a single argument that is
 617          * an array of time period parameters.
 618          *
 619          * @return Message $this
 620          */
 621         public function timeperiodParams( /*...*/ ) {
 622                 $params = func_get_args();
 623                 if ( isset( $params[0] ) && is_array( $params[0] ) ) {
 624                         $params = $params[0];
 625                 }
 626                 foreach ( $params as $param ) {
 627                         $this->parameters[] = self::timeperiodParam( $param );
 628                 }
 629                 return $this;
 630         }
 631
 632         /**
 633          * Add parameters that are file sizes and will be passed through
 634          * Language::formatSize before substitution
 635          *
 636          * @since 1.22
 637          *
 638          * @param int|int[] $param,... Size parameters, or a single argument that is
 639          * an array of size parameters.
 640          *
 641          * @return Message $this
 642          */
 643         public function sizeParams( /*...*/ ) {
 644                 $params = func_get_args();
 645                 if ( isset( $params[0] ) && is_array( $params[0] ) ) {
 646                         $params = $params[0];
 647                 }
 648                 foreach ( $params as $param ) {
 649                         $this->parameters[] = self::sizeParam( $param );
 650                 }
 651                 return $this;
 652         }
 653
 654         /**
 655          * Add parameters that are bitrates and will be passed through
 656          * Language::formatBitrate before substitution
 657          *
 658          * @since 1.22
 659          *
 660          * @param int|int[] $param,... Bit rate parameters, or a single argument that is
 661          * an array of bit rate parameters.
 662          *
 663          * @return Message $this
 664          */
 665         public function bitrateParams( /*...*/ ) {
 666                 $params = func_get_args();
 667                 if ( isset( $params[0] ) && is_array( $params[0] ) ) {
 668                         $params = $params[0];
 669                 }
 670                 foreach ( $params as $param ) {
 671                         $this->parameters[] = self::bitrateParam( $param );
 672                 }
 673                 return $this;
 674         }
 675
 676         /**
 677          * Add parameters that are plaintext and will be passed through without
 678          * the content being evaluated.  Plaintext parameters are not valid as
 679          * arguments to parser functions. This differs from self::rawParams in
 680          * that the Message class handles escaping to match the output format.
 681          *
 682          * @since 1.25
 683          *
 684          * @param string|string[] $param,... plaintext parameters, or a single argument that is
 685          * an array of plaintext parameters.
 686          *
 687          * @return Message $this
 688          */
 689         public function plaintextParams( /*...*/ ) {
 690                 $params = func_get_args();
 691                 if ( isset( $params[0] ) && is_array( $params[0] ) ) {
 692                         $params = $params[0];
 693                 }
 694                 foreach ( $params as $param ) {
 695                         $this->parameters[] = self::plaintextParam( $param );
 696                 }
 697                 return $this;
 698         }
 699
 700         /**
 701          * Set the language and the title from a context object
 702          *
 703          * @since 1.19
 704          *
 705          * @param IContextSource $context
 706          *
 707          * @return Message $this
 708          */
 709         public function setContext( IContextSource $context ) {
 710                 $this->inLanguage( $context->getLanguage() );
 711                 $this->title( $context->getTitle() );
 712                 $this->interface = true;
 713
 714                 return $this;
 715         }
 716
 717         /**
 718          * Request the message in any language that is supported.
 719          *
 720          * As a side effect interface message status is unconditionally
 721          * turned off.
 722          *
 723          * @since 1.17
 724          * @param Language|string $lang Language code or Language object.
 725          * @return Message $this
 726          * @throws MWException
 727          */
 728         public function inLanguage( $lang ) {
 729                 if ( $lang instanceof Language ) {
 730                         $this->language = $lang;
 731                 } elseif ( is_string( $lang ) ) {
 732                         if ( !$this->language instanceof Language || $this->language->getCode() != $lang ) {
 733                                 $this->language = Language::factory( $lang );
 734                         }
 735                 } elseif ( $lang instanceof StubUserLang ) {
 736                         $this->language = false;
 737                 } else {
 738                         $type = gettype( $lang );
 739                         throw new MWException( __METHOD__ . " must be "
 740                                 . "passed a String or Language object; $type given"
 741                         );
 742                 }
 743                 $this->message = null;
 744                 $this->interface = false;
 745                 return $this;
 746         }
 747
 748         /**
 749          * Request the message in the wiki's content language,
 750          * unless it is disabled for this message.
 751          *
 752          * @since 1.17
 753          * @see $wgForceUIMsgAsContentMsg
 754          *
 755          * @return Message $this
 756          */
 757         public function inContentLanguage() {
 758                 global $wgForceUIMsgAsContentMsg;
 759                 if ( in_array( $this->key, (array)$wgForceUIMsgAsContentMsg ) ) {
 760                         return $this;
 761                 }
 762
 763                 global $wgContLang;
 764                 $this->inLanguage( $wgContLang );
 765                 return $this;
 766         }
 767
 768         /**
 769          * Allows manipulating the interface message flag directly.
 770          * Can be used to restore the flag after setting a language.
 771          *
 772          * @since 1.20
 773          *
 774          * @param bool $interface
 775          *
 776          * @return Message $this
 777          */
 778         public function setInterfaceMessageFlag( $interface ) {
 779                 $this->interface = (bool)$interface;
 780                 return $this;
 781         }
 782
 783         /**
 784          * Enable or disable database use.
 785          *
 786          * @since 1.17
 787          *
 788          * @param bool $useDatabase
 789          *
 790          * @return Message $this
 791          */
 792         public function useDatabase( $useDatabase ) {
 793                 $this->useDatabase = (bool)$useDatabase;
 794                 $this->message = null;
 795                 return $this;
 796         }
 797
 798         /**
 799          * Set the Title object to use as context when transforming the message
 800          *
 801          * @since 1.18
 802          *
 803          * @param Title $title
 804          *
 805          * @return Message $this
 806          */
 807         public function title( $title ) {
 808                 $this->title = $title;
 809                 return $this;
 810         }
 811
 812         /**
 813          * Returns the message as a Content object.
 814          *
 815          * @return Content
 816          */
 817         public function content() {
 818                 if ( !$this->content ) {
 819                         $this->content = new MessageContent( $this );
 820                 }
 821
 822                 return $this->content;
 823         }
 824
 825         /**
 826          * Returns the message parsed from wikitext to HTML.
 827          *
 828          * @since 1.17
 829          *
 830          * @param string|null $format One of the FORMAT_* constants. Null means use whatever was used
 831          *   the last time (this is for B/C and should be avoided).
 832          *
 833          * @return string HTML
 834          */
 835         public function toString( $format = null ) {
 836                 if ( $format === null ) {
 837                         $ex = new LogicException( __METHOD__ . ' using implicit format: ' . $this->format );
 838                         \MediaWiki\Logger\LoggerFactory::getInstance( 'message-format' )->warning(
 839                                 $ex->getMessage(), [ 'exception' => $ex, 'format' => $this->format, 'key' => $this->key ] );
 840                         $format = $this->format;
 841                 }
 842                 $string = $this->fetchMessage();
 843
 844                 if ( $string === false ) {
 845                         // Err on the side of safety, ensure that the output
 846                         // is always html safe in the event the message key is
 847                         // missing, since in that case its highly likely the
 848                         // message key is user-controlled.
 849                         // '⧼' is used instead of '<' to side-step any
 850                         // double-escaping issues.
 851                         // (Keep synchronised with mw.Message#toString in JS.)
 852                         return '⧼' . htmlspecialchars( $this->key ) . '⧽';
 853                 }
 854
 855                 # Replace $* with a list of parameters for &uselang=qqx.
 856                 if ( strpos( $string, '$*' ) !== false ) {
 857                         $paramlist = '';
 858                         if ( $this->parameters !== [] ) {
 859                                 $paramlist = ': $' . implode( ', $', range( 1, count( $this->parameters ) ) );
 860                         }
 861                         $string = str_replace( '$*', $paramlist, $string );
 862                 }
 863
 864                 # Replace parameters before text parsing
 865                 $string = $this->replaceParameters( $string, 'before', $format );
 866
 867                 # Maybe transform using the full parser
 868                 if ( $format === self::FORMAT_PARSE ) {
 869                         $string = $this->parseText( $string );
 870                         $string = Parser::stripOuterParagraph( $string );
 871                 } elseif ( $format === self::FORMAT_BLOCK_PARSE ) {
 872                         $string = $this->parseText( $string );
 873                 } elseif ( $format === self::FORMAT_TEXT ) {
 874                         $string = $this->transformText( $string );
 875                 } elseif ( $format === self::FORMAT_ESCAPED ) {
 876                         $string = $this->transformText( $string );
 877                         $string = htmlspecialchars( $string, ENT_QUOTES, 'UTF-8', false );
 878                 }
 879
 880                 # Raw parameter replacement
 881                 $string = $this->replaceParameters( $string, 'after', $format );
 882
 883                 return $string;
 884         }
 885
 886         /**
 887          * Magic method implementation of the above (for PHP >= 5.2.0), so we can do, eg:
 888          *     $foo = new Message( $key );
 889          *     $string = "<abbr>$foo</abbr>";
 890          *
 891          * @since 1.18
 892          *
 893          * @return string
 894          */
 895         public function __toString() {
 896                 // PHP doesn't allow __toString to throw exceptions and will
 897                 // trigger a fatal error if it does. So, catch any exceptions.
 898
 899                 try {
 900                         return $this->toString( self::FORMAT_PARSE );
 901                 } catch ( Exception $ex ) {
 902                         try {
 903                                 trigger_error( "Exception caught in " . __METHOD__ . " (message " . $this->key . "): "
 904                                         . $ex, E_USER_WARNING );
 905                         } catch ( Exception $ex ) {
 906                                 // Doh! Cause a fatal error after all?
 907                         }
 908
 909                         return '⧼' . htmlspecialchars( $this->key ) . '⧽';
 910                 }
 911         }
 912
 913         /**
 914          * Fully parse the text from wikitext to HTML.
 915          *
 916          * @since 1.17
 917          *
 918          * @return string Parsed HTML.
 919          */
 920         public function parse() {
 921                 $this->format = self::FORMAT_PARSE;
 922                 return $this->toString( self::FORMAT_PARSE );
 923         }
 924
 925         /**
 926          * Returns the message text. {{-transformation is done.
 927          *
 928          * @since 1.17
 929          *
 930          * @return string Unescaped message text.
 931          */
 932         public function text() {
 933                 $this->format = self::FORMAT_TEXT;
 934                 return $this->toString( self::FORMAT_TEXT );
 935         }
 936
 937         /**
 938          * Returns the message text as-is, only parameters are substituted.
 939          *
 940          * @since 1.17
 941          *
 942          * @return string Unescaped untransformed message text.
 943          */
 944         public function plain() {
 945                 $this->format = self::FORMAT_PLAIN;
 946                 return $this->toString( self::FORMAT_PLAIN );
 947         }
 948
 949         /**
 950          * Returns the parsed message text which is always surrounded by a block element.
 951          *
 952          * @since 1.17
 953          *
 954          * @return string HTML
 955          */
 956         public function parseAsBlock() {
 957                 $this->format = self::FORMAT_BLOCK_PARSE;
 958                 return $this->toString( self::FORMAT_BLOCK_PARSE );
 959         }
 960
 961         /**
 962          * Returns the message text. {{-transformation is done and the result
 963          * is escaped excluding any raw parameters.
 964          *
 965          * @since 1.17
 966          *
 967          * @return string Escaped message text.
 968          */
 969         public function escaped() {
 970                 $this->format = self::FORMAT_ESCAPED;
 971                 return $this->toString( self::FORMAT_ESCAPED );
 972         }
 973
 974         /**
 975          * Check whether a message key has been defined currently.
 976          *
 977          * @since 1.17
 978          *
 979          * @return bool
 980          */
 981         public function exists() {
 982                 return $this->fetchMessage() !== false;
 983         }
 984
 985         /**
 986          * Check whether a message does not exist, or is an empty string
 987          *
 988          * @since 1.18
 989          * @todo FIXME: Merge with isDisabled()?
 990          *
 991          * @return bool
 992          */
 993         public function isBlank() {
 994                 $message = $this->fetchMessage();
 995                 return $message === false || $message === '';
 996         }
 997
 998         /**
 999          * Check whether a message does not exist, is an empty string, or is "-".
1000          *
1001          * @since 1.18
1002          *
1003          * @return bool
1004          */
1005         public function isDisabled() {
1006                 $message = $this->fetchMessage();
1007                 return $message === false || $message === '' || $message === '-';
1008         }
1009
1010         /**
1011          * @since 1.17
1012          *
1013          * @param mixed $raw
1014          *
1015          * @return array Array with a single "raw" key.
1016          */
1017         public static function rawParam( $raw ) {
1018                 return [ 'raw' => $raw ];
1019         }
1020
1021         /**
1022          * @since 1.18
1023          *
1024          * @param mixed $num
1025          *
1026          * @return array Array with a single "num" key.
1027          */
1028         public static function numParam( $num ) {
1029                 return [ 'num' => $num ];
1030         }
1031
1032         /**
1033          * @since 1.22
1034          *
1035          * @param int $duration
1036          *
1037          * @return int[] Array with a single "duration" key.
1038          */
1039         public static function durationParam( $duration ) {
1040                 return [ 'duration' => $duration ];
1041         }
1042
1043         /**
1044          * @since 1.22
1045          *
1046          * @param string $expiry
1047          *
1048          * @return string[] Array with a single "expiry" key.
1049          */
1050         public static function expiryParam( $expiry ) {
1051                 return [ 'expiry' => $expiry ];
1052         }
1053
1054         /**
1055          * @since 1.22
1056          *
1057          * @param int $period
1058          *
1059          * @return int[] Array with a single "period" key.
1060          */
1061         public static function timeperiodParam( $period ) {
1062                 return [ 'period' => $period ];
1063         }
1064
1065         /**
1066          * @since 1.22
1067          *
1068          * @param int $size
1069          *
1070          * @return int[] Array with a single "size" key.
1071          */
1072         public static function sizeParam( $size ) {
1073                 return [ 'size' => $size ];
1074         }
1075
1076         /**
1077          * @since 1.22
1078          *
1079          * @param int $bitrate
1080          *
1081          * @return int[] Array with a single "bitrate" key.
1082          */
1083         public static function bitrateParam( $bitrate ) {
1084                 return [ 'bitrate' => $bitrate ];
1085         }
1086
1087         /**
1088          * @since 1.25
1089          *
1090          * @param string $plaintext
1091          *
1092          * @return string[] Array with a single "plaintext" key.
1093          */
1094         public static function plaintextParam( $plaintext ) {
1095                 return [ 'plaintext' => $plaintext ];
1096         }
1097
1098         /**
1099          * @since 1.29
1100          *
1101          * @param array $list
1102          * @param string $type 'comma', 'semicolon', 'pipe', 'text'
1103          * @return array Array with "list" and "type" keys.
1104          */
1105         public static function listParam( array $list, $type = 'text' ) {
1106                 if ( !isset( self::$listTypeMap[$type] ) ) {
1107                         throw new InvalidArgumentException(
1108                                 "Invalid type '$type'. Known types are: " . join( ', ', array_keys( self::$listTypeMap ) )
1109                         );
1110                 }
1111                 return [ 'list' => $list, 'type' => $type ];
1112         }
1113
1114         /**
1115          * Substitutes any parameters into the message text.
1116          *
1117          * @since 1.17
1118          *
1119          * @param string $message The message text.
1120          * @param string $type Either "before" or "after".
1121          * @param string $format One of the FORMAT_* constants.
1122          *
1123          * @return string
1124          */
1125         protected function replaceParameters( $message, $type = 'before', $format ) {
1126                 $replacementKeys = [];
1127                 foreach ( $this->parameters as $n => $param ) {
1128                         list( $paramType, $value ) = $this->extractParam( $param, $format );
1129                         if ( $type === $paramType ) {
1130                                 $replacementKeys['$' . ( $n + 1 )] = $value;
1131                         }
1132                 }
1133                 $message = strtr( $message, $replacementKeys );
1134                 return $message;
1135         }
1136
1137         /**
1138          * Extracts the parameter type and preprocessed the value if needed.
1139          *
1140          * @since 1.18
1141          *
1142          * @param mixed $param Parameter as defined in this class.
1143          * @param string $format One of the FORMAT_* constants.
1144          *
1145          * @return array Array with the parameter type (either "before" or "after") and the value.
1146          */
1147         protected function extractParam( $param, $format ) {
1148                 if ( is_array( $param ) ) {
1149                         if ( isset( $param['raw'] ) ) {
1150                                 return [ 'after', $param['raw'] ];
1151                         } elseif ( isset( $param['num'] ) ) {
1152                                 // Replace number params always in before step for now.
1153                                 // No support for combined raw and num params
1154                                 return [ 'before', $this->getLanguage()->formatNum( $param['num'] ) ];
1155                         } elseif ( isset( $param['duration'] ) ) {
1156                                 return [ 'before', $this->getLanguage()->formatDuration( $param['duration'] ) ];
1157                         } elseif ( isset( $param['expiry'] ) ) {
1158                                 return [ 'before', $this->getLanguage()->formatExpiry( $param['expiry'] ) ];
1159                         } elseif ( isset( $param['period'] ) ) {
1160                                 return [ 'before', $this->getLanguage()->formatTimePeriod( $param['period'] ) ];
1161                         } elseif ( isset( $param['size'] ) ) {
1162                                 return [ 'before', $this->getLanguage()->formatSize( $param['size'] ) ];
1163                         } elseif ( isset( $param['bitrate'] ) ) {
1164                                 return [ 'before', $this->getLanguage()->formatBitrate( $param['bitrate'] ) ];
1165                         } elseif ( isset( $param['plaintext'] ) ) {
1166                                 return [ 'after', $this->formatPlaintext( $param['plaintext'], $format ) ];
1167                         } elseif ( isset( $param['list'] ) ) {
1168                                 return $this->formatListParam( $param['list'], $param['type'], $format );
1169                         } else {
1170                                 if ( !is_scalar( $param ) ) {
1171                                         $param = serialize( $param );
1172                                 }
1173                                 \MediaWiki\Logger\LoggerFactory::getInstance( 'Bug58676' )->warning(
1174                                         'Invalid parameter for message "{msgkey}": {param}',
1175                                         [
1176                                                 'exception' => new Exception,
1177                                                 'msgkey' => $this->getKey(),
1178                                                 'param' => htmlspecialchars( $param ),
1179                                         ]
1180                                 );
1181
1182                                 return [ 'before', '[INVALID]' ];
1183                         }
1184                 } elseif ( $param instanceof Message ) {
1185                         // Match language, flags, etc. to the current message.
1186                         $msg = clone $param;
1187                         if ( $msg->language !== $this->language || $msg->useDatabase !== $this->useDatabase ) {
1188                                 // Cache depends on these parameters
1189                                 $msg->message = null;
1190                         }
1191                         $msg->interface = $this->interface;
1192                         $msg->language = $this->language;
1193                         $msg->useDatabase = $this->useDatabase;
1194                         $msg->title = $this->title;
1195
1196                         // DWIM
1197                         if ( $format === 'block-parse' ) {
1198                                 $format = 'parse';
1199                         }
1200                         $msg->format = $format;
1201
1202                         // Message objects should not be before parameters because
1203                         // then they'll get double escaped. If the message needs to be
1204                         // escaped, it'll happen right here when we call toString().
1205                         return [ 'after', $msg->toString( $format ) ];
1206                 } else {
1207                         return [ 'before', $param ];
1208                 }
1209         }
1210
1211         /**
1212          * Wrapper for what ever method we use to parse wikitext.
1213          *
1214          * @since 1.17
1215          *
1216          * @param string $string Wikitext message contents.
1217          *
1218          * @return string Wikitext parsed into HTML.
1219          */
1220         protected function parseText( $string ) {
1221                 $out = MessageCache::singleton()->parse(
1222                         $string,
1223                         $this->title,
1224                         /*linestart*/true,
1225                         $this->interface,
1226                         $this->getLanguage()
1227                 );
1228
1229                 return $out instanceof ParserOutput ? $out->getText() : $out;
1230         }
1231
1232         /**
1233          * Wrapper for what ever method we use to {{-transform wikitext.
1234          *
1235          * @since 1.17
1236          *
1237          * @param string $string Wikitext message contents.
1238          *
1239          * @return string Wikitext with {{-constructs replaced with their values.
1240          */
1241         protected function transformText( $string ) {
1242                 return MessageCache::singleton()->transform(
1243                         $string,
1244                         $this->interface,
1245                         $this->getLanguage(),
1246                         $this->title
1247                 );
1248         }
1249
1250         /**
1251          * Wrapper for what ever method we use to get message contents.
1252          *
1253          * @since 1.17
1254          *
1255          * @return string
1256          * @throws MWException If message key array is empty.
1257          */
1258         protected function fetchMessage() {
1259                 if ( $this->message === null ) {
1260                         $cache = MessageCache::singleton();
1261
1262                         foreach ( $this->keysToTry as $key ) {
1263                                 $message = $cache->get( $key, $this->useDatabase, $this->getLanguage() );
1264                                 if ( $message !== false && $message !== '' ) {
1265                                         break;
1266                                 }
1267                         }
1268
1269                         // NOTE: The constructor makes sure keysToTry isn't empty,
1270                         //       so we know that $key and $message are initialized.
1271                         $this->key = $key;
1272                         $this->message = $message;
1273                 }
1274                 return $this->message;
1275         }
1276
1277         /**
1278          * Formats a message parameter wrapped with 'plaintext'. Ensures that
1279          * the entire string is displayed unchanged when displayed in the output
1280          * format.
1281          *
1282          * @since 1.25
1283          *
1284          * @param string $plaintext String to ensure plaintext output of
1285          * @param string $format One of the FORMAT_* constants.
1286          *
1287          * @return string Input plaintext encoded for output to $format
1288          */
1289         protected function formatPlaintext( $plaintext, $format ) {
1290                 switch ( $format ) {
1291                 case self::FORMAT_TEXT:
1292                 case self::FORMAT_PLAIN:
1293                         return $plaintext;
1294
1295                 case self::FORMAT_PARSE:
1296                 case self::FORMAT_BLOCK_PARSE:
1297                 case self::FORMAT_ESCAPED:
1298                 default:
1299                         return htmlspecialchars( $plaintext, ENT_QUOTES );
1300
1301                 }
1302         }
1303
1304         /**
1305          * Formats a list of parameters as a concatenated string.
1306          * @since 1.29
1307          * @param array $params
1308          * @param string $listType
1309          * @param string $format One of the FORMAT_* constants.
1310          * @return array Array with the parameter type (either "before" or "after") and the value.
1311          */
1312         protected function formatListParam( array $params, $listType, $format ) {
1313                 if ( !isset( self::$listTypeMap[$listType] ) ) {
1314                         $warning = 'Invalid list type for message "' . $this->getKey() . '": '
1315                                 . htmlspecialchars( $listType )
1316                                 . ' (params are ' . htmlspecialchars( serialize( $params ) ) . ')';
1317                         trigger_error( $warning, E_USER_WARNING );
1318                         $e = new Exception;
1319                         wfDebugLog( 'Bug58676', $warning . "\n" . $e->getTraceAsString() );
1320                         return [ 'before', '[INVALID]' ];
1321                 }
1322                 $func = self::$listTypeMap[$listType];
1323
1324                 // Handle an empty list sensibly
1325                 if ( !$params ) {
1326                         return [ 'before', $this->getLanguage()->$func( [] ) ];
1327                 }
1328
1329                 // First, determine what kinds of list items we have
1330                 $types = [];
1331                 $vars = [];
1332                 $list = [];
1333                 foreach ( $params as $n => $p ) {
1334                         list( $type, $value ) = $this->extractParam( $p, $format );
1335                         $types[$type] = true;
1336                         $list[] = $value;
1337                         $vars[] = '$' . ( $n + 1 );
1338                 }
1339
1340                 // Easy case: all are 'before' or 'after', so just join the
1341                 // values and use the same type.
1342                 if ( count( $types ) === 1 ) {
1343                         return [ key( $types ), $this->getLanguage()->$func( $list ) ];
1344                 }
1345
1346                 // Hard case: We need to process each value per its type, then
1347                 // return the concatenated values as 'after'. We handle this by turning
1348                 // the list into a RawMessage and processing that as a parameter.
1349                 $vars = $this->getLanguage()->$func( $vars );
1350                 return $this->extractParam( new RawMessage( $vars, $params ), $format );
1351         }
1352 }