includes/htmlform/HTMLFormField.php

   1 <?php
   2
   3 /**
   4  * The parent class to generate form fields.  Any field type should
   5  * be a subclass of this.
   6  */
   7 abstract class HTMLFormField {
   8         public $mParams;
   9
  10         protected $mValidationCallback;
  11         protected $mFilterCallback;
  12         protected $mName;
  13         protected $mLabel; # String label.  Set on construction
  14         protected $mID;
  15         protected $mClass = '';
  16         protected $mHelpClass = false;
  17         protected $mDefault;
  18         protected $mOptions = false;
  19         protected $mOptionsLabelsNotFromMessage = false;
  20         protected $mHideIf = null;
  21
  22         /**
  23          * @var bool If true will generate an empty div element with no label
  24          * @since 1.22
  25          */
  26         protected $mShowEmptyLabels = true;
  27
  28         /**
  29          * @var HTMLForm
  30          */
  31         public $mParent;
  32
  33         /**
  34          * This function must be implemented to return the HTML to generate
  35          * the input object itself.  It should not implement the surrounding
  36          * table cells/rows, or labels/help messages.
  37          *
  38          * @param string $value The value to set the input to; eg a default
  39          *     text for a text input.
  40          *
  41          * @return string Valid HTML.
  42          */
  43         abstract function getInputHTML( $value );
  44
  45         /**
  46          * Get a translated interface message
  47          *
  48          * This is a wrapper around $this->mParent->msg() if $this->mParent is set
  49          * and wfMessage() otherwise.
  50          *
  51          * Parameters are the same as wfMessage().
  52          *
  53          * @return Message
  54          */
  55         function msg() {
  56                 $args = func_get_args();
  57
  58                 if ( $this->mParent ) {
  59                         $callback = array( $this->mParent, 'msg' );
  60                 } else {
  61                         $callback = 'wfMessage';
  62                 }
  63
  64                 return call_user_func_array( $callback, $args );
  65         }
  66
  67
  68         /**
  69          * Fetch a field value from $alldata for the closest field matching a given
  70          * name.
  71          *
  72          * This is complex because it needs to handle array fields like the user
  73          * would expect. The general algorithm is to look for $name as a sibling
  74          * of $this, then a sibling of $this's parent, and so on. Keeping in mind
  75          * that $name itself might be referencing an array.
  76          *
  77          * @param array $alldata
  78          * @param string $name
  79          * @return string
  80          */
  81         protected function getNearestFieldByName( $alldata, $name ) {
  82                 $tmp = $this->mName;
  83                 $thisKeys = array();
  84                 while ( preg_match( '/^(.+)\[([^\]]+)\]$/', $tmp, $m ) ) {
  85                         array_unshift( $thisKeys, $m[2] );
  86                         $tmp = $m[1];
  87                 }
  88                 if ( substr( $tmp, 0, 2 ) == 'wp' &&
  89                         !isset( $alldata[$tmp] ) &&
  90                         isset( $alldata[substr( $tmp, 2 )] )
  91                 ) {
  92                         // Adjust for name mangling.
  93                         $tmp = substr( $tmp, 2 );
  94                 }
  95                 array_unshift( $thisKeys, $tmp );
  96
  97                 $tmp = $name;
  98                 $nameKeys = array();
  99                 while ( preg_match( '/^(.+)\[([^\]]+)\]$/', $tmp, $m ) ) {
 100                         array_unshift( $nameKeys, $m[2] );
 101                         $tmp = $m[1];
 102                 }
 103                 array_unshift( $nameKeys, $tmp );
 104
 105                 $testValue = '';
 106                 for ( $i = count( $thisKeys ) - 1; $i >= 0; $i-- ) {
 107                         $keys = array_merge( array_slice( $thisKeys, 0, $i ), $nameKeys );
 108                         $data = $alldata;
 109                         while ( $keys ) {
 110                                 $key = array_shift( $keys );
 111                                 if ( !is_array( $data ) || !isset( $data[$key] ) ) {
 112                                         continue 2;
 113                                 }
 114                                 $data = $data[$key];
 115                         }
 116                         $testValue = $data;
 117                         break;
 118                 }
 119
 120                 return $testValue;
 121         }
 122
 123         /**
 124          * Helper function for isHidden to handle recursive data structures.
 125          *
 126          * @param array $alldata
 127          * @param array $params
 128          * @return bool
 129          */
 130         protected function isHiddenRecurse( array $alldata, array $params ) {
 131                 $origParams = $params;
 132                 $op = array_shift( $params );
 133
 134                 try {
 135                         switch ( $op ) {
 136                                 case 'AND':
 137                                         foreach ( $params as $i => $p ) {
 138                                                 if ( !is_array( $p ) ) {
 139                                                         throw new MWException(
 140                                                                 "Expected array, found " . gettype( $p ) . " at index $i"
 141                                                         );
 142                                                 }
 143                                                 if ( !$this->isHiddenRecurse( $alldata, $p ) ) {
 144                                                         return false;
 145                                                 }
 146                                         }
 147                                         return true;
 148
 149                                 case 'OR':
 150                                         foreach ( $params as $p ) {
 151                                                 if ( !is_array( $p ) ) {
 152                                                         throw new MWException(
 153                                                                 "Expected array, found " . gettype( $p ) . " at index $i"
 154                                                         );
 155                                                 }
 156                                                 if ( $this->isHiddenRecurse( $alldata, $p ) ) {
 157                                                         return true;
 158                                                 }
 159                                         }
 160                                         return false;
 161
 162                                 case 'NAND':
 163                                         foreach ( $params as $i => $p ) {
 164                                                 if ( !is_array( $p ) ) {
 165                                                         throw new MWException(
 166                                                                 "Expected array, found " . gettype( $p ) . " at index $i"
 167                                                         );
 168                                                 }
 169                                                 if ( !$this->isHiddenRecurse( $alldata, $p ) ) {
 170                                                         return true;
 171                                                 }
 172                                         }
 173                                         return false;
 174
 175                                 case 'NOR':
 176                                         foreach ( $params as $p ) {
 177                                                 if ( !is_array( $p ) ) {
 178                                                         throw new MWException(
 179                                                                 "Expected array, found " . gettype( $p ) . " at index $i"
 180                                                         );
 181                                                 }
 182                                                 if ( $this->isHiddenRecurse( $alldata, $p ) ) {
 183                                                         return false;
 184                                                 }
 185                                         }
 186                                         return true;
 187
 188                                 case 'NOT':
 189                                         if ( count( $params ) !== 1 ) {
 190                                                 throw new MWException( "NOT takes exactly one parameter" );
 191                                         }
 192                                         $p = $params[0];
 193                                         if ( !is_array( $p ) ) {
 194                                                 throw new MWException(
 195                                                         "Expected array, found " . gettype( $p ) . " at index 0"
 196                                                 );
 197                                         }
 198                                         return !$this->isHiddenRecurse( $alldata, $p );
 199
 200                                 case '===':
 201                                 case '!==':
 202                                         if ( count( $params ) !== 2 ) {
 203                                                 throw new MWException( "$op takes exactly two parameters" );
 204                                         }
 205                                         list( $field, $value ) = $params;
 206                                         if ( !is_string( $field ) || !is_string( $value ) ) {
 207                                                 throw new MWException( "Parameters for $op must be strings" );
 208                                         }
 209                                         $testValue = $this->getNearestFieldByName( $alldata, $field );
 210                                         switch ( $op ) {
 211                                                 case '===':
 212                                                         return ( $value === $testValue );
 213                                                 case '!==':
 214                                                         return ( $value !== $testValue );
 215                                         }
 216
 217                                 default:
 218                                         throw new MWException( "Unknown operation" );
 219                         }
 220                 } catch ( MWException $ex ) {
 221                         throw new MWException(
 222                                 "Invalid hide-if specification for $this->mName: " .
 223                                 $ex->getMessage() . " in " . var_export( $origParams, true ),
 224                                 0, $ex
 225                         );
 226                 }
 227         }
 228
 229         /**
 230          * Test whether this field is supposed to be hidden, based on the values of
 231          * the other form fields.
 232          *
 233          * @since 1.23
 234          * @param array $alldata The data collected from the form
 235          * @return bool
 236          */
 237         function isHidden( $alldata ) {
 238                 if ( !$this->mHideIf ) {
 239                         return false;
 240                 }
 241
 242                 return $this->isHiddenRecurse( $alldata, $this->mHideIf );
 243         }
 244
 245         /**
 246          * Override this function if the control can somehow trigger a form
 247          * submission that shouldn't actually submit the HTMLForm.
 248          *
 249          * @since 1.23
 250          * @param string|array $value The value the field was submitted with
 251          * @param array $alldata The data collected from the form
 252          *
 253          * @return bool True to cancel the submission
 254          */
 255         function cancelSubmit( $value, $alldata ) {
 256                 return false;
 257         }
 258
 259         /**
 260          * Override this function to add specific validation checks on the
 261          * field input.  Don't forget to call parent::validate() to ensure
 262          * that the user-defined callback mValidationCallback is still run
 263          *
 264          * @param string|array $value The value the field was submitted with
 265          * @param array $alldata The data collected from the form
 266          *
 267          * @return bool|string True on success, or String error to display, or
 268          *   false to fail validation without displaying an error.
 269          */
 270         function validate( $value, $alldata ) {
 271                 if ( $this->isHidden( $alldata ) ) {
 272                         return true;
 273                 }
 274
 275                 if ( isset( $this->mParams['required'] )
 276                         && $this->mParams['required'] !== false
 277                         && $value === ''
 278                 ) {
 279                         return $this->msg( 'htmlform-required' )->parse();
 280                 }
 281
 282                 if ( isset( $this->mValidationCallback ) ) {
 283                         return call_user_func( $this->mValidationCallback, $value, $alldata, $this->mParent );
 284                 }
 285
 286                 return true;
 287         }
 288
 289         function filter( $value, $alldata ) {
 290                 if ( isset( $this->mFilterCallback ) ) {
 291                         $value = call_user_func( $this->mFilterCallback, $value, $alldata, $this->mParent );
 292                 }
 293
 294                 return $value;
 295         }
 296
 297         /**
 298          * Should this field have a label, or is there no input element with the
 299          * appropriate id for the label to point to?
 300          *
 301          * @return bool True to output a label, false to suppress
 302          */
 303         protected function needsLabel() {
 304                 return true;
 305         }
 306
 307         /**
 308          * Tell the field whether to generate a separate label element if its label
 309          * is blank.
 310          *
 311          * @since 1.22
 312          *
 313          * @param bool $show Set to false to not generate a label.
 314          * @return void
 315          */
 316         public function setShowEmptyLabel( $show ) {
 317                 $this->mShowEmptyLabels = $show;
 318         }
 319
 320         /**
 321          * Get the value that this input has been set to from a posted form,
 322          * or the input's default value if it has not been set.
 323          *
 324          * @param WebRequest $request
 325          * @return string The value
 326          */
 327         function loadDataFromRequest( $request ) {
 328                 if ( $request->getCheck( $this->mName ) ) {
 329                         return $request->getText( $this->mName );
 330                 } else {
 331                         return $this->getDefault();
 332                 }
 333         }
 334
 335         /**
 336          * Initialise the object
 337          *
 338          * @param array $params Associative Array. See HTMLForm doc for syntax.
 339          *
 340          * @since 1.22 The 'label' attribute no longer accepts raw HTML, use 'label-raw' instead
 341          * @throws MWException
 342          */
 343         function __construct( $params ) {
 344                 $this->mParams = $params;
 345
 346                 # Generate the label from a message, if possible
 347                 if ( isset( $params['label-message'] ) ) {
 348                         $msgInfo = $params['label-message'];
 349
 350                         if ( is_array( $msgInfo ) ) {
 351                                 $msg = array_shift( $msgInfo );
 352                         } else {
 353                                 $msg = $msgInfo;
 354                                 $msgInfo = array();
 355                         }
 356
 357                         $this->mLabel = wfMessage( $msg, $msgInfo )->parse();
 358                 } elseif ( isset( $params['label'] ) ) {
 359                         if ( $params['label'] === '&#160;' ) {
 360                                 // Apparently some things set &nbsp directly and in an odd format
 361                                 $this->mLabel = '&#160;';
 362                         } else {
 363                                 $this->mLabel = htmlspecialchars( $params['label'] );
 364                         }
 365                 } elseif ( isset( $params['label-raw'] ) ) {
 366                         $this->mLabel = $params['label-raw'];
 367                 }
 368
 369                 $this->mName = "wp{$params['fieldname']}";
 370                 if ( isset( $params['name'] ) ) {
 371                         $this->mName = $params['name'];
 372                 }
 373
 374                 $validName = Sanitizer::escapeId( $this->mName );
 375                 $validName = str_replace( array( '.5B', '.5D' ), array( '[', ']' ), $validName );
 376                 if ( $this->mName != $validName && !isset( $params['nodata'] ) ) {
 377                         throw new MWException( "Invalid name '{$this->mName}' passed to " . __METHOD__ );
 378                 }
 379
 380                 $this->mID = "mw-input-{$this->mName}";
 381
 382                 if ( isset( $params['default'] ) ) {
 383                         $this->mDefault = $params['default'];
 384                 }
 385
 386                 if ( isset( $params['id'] ) ) {
 387                         $id = $params['id'];
 388                         $validId = Sanitizer::escapeId( $id );
 389
 390                         if ( $id != $validId ) {
 391                                 throw new MWException( "Invalid id '$id' passed to " . __METHOD__ );
 392                         }
 393
 394                         $this->mID = $id;
 395                 }
 396
 397                 if ( isset( $params['cssclass'] ) ) {
 398                         $this->mClass = $params['cssclass'];
 399                 }
 400
 401                 if ( isset( $params['csshelpclass'] ) ) {
 402                         $this->mHelpClass = $params['csshelpclass'];
 403                 }
 404
 405                 if ( isset( $params['validation-callback'] ) ) {
 406                         $this->mValidationCallback = $params['validation-callback'];
 407                 }
 408
 409                 if ( isset( $params['filter-callback'] ) ) {
 410                         $this->mFilterCallback = $params['filter-callback'];
 411                 }
 412
 413                 if ( isset( $params['flatlist'] ) ) {
 414                         $this->mClass .= ' mw-htmlform-flatlist';
 415                 }
 416
 417                 if ( isset( $params['hidelabel'] ) ) {
 418                         $this->mShowEmptyLabels = false;
 419                 }
 420
 421                 if ( isset( $params['hide-if'] ) ) {
 422                         $this->mHideIf = $params['hide-if'];
 423                 }
 424         }
 425
 426         /**
 427          * Get the complete table row for the input, including help text,
 428          * labels, and whatever.
 429          *
 430          * @param string $value The value to set the input to.
 431          *
 432          * @return string Complete HTML table row.
 433          */
 434         function getTableRow( $value ) {
 435                 list( $errors, $errorClass ) = $this->getErrorsAndErrorClass( $value );
 436                 $inputHtml = $this->getInputHTML( $value );
 437                 $fieldType = get_class( $this );
 438                 $helptext = $this->getHelpTextHtmlTable( $this->getHelpText() );
 439                 $cellAttributes = array();
 440                 $rowAttributes = array();
 441                 $rowClasses = '';
 442
 443                 if ( !empty( $this->mParams['vertical-label'] ) ) {
 444                         $cellAttributes['colspan'] = 2;
 445                         $verticalLabel = true;
 446                 } else {
 447                         $verticalLabel = false;
 448                 }
 449
 450                 $label = $this->getLabelHtml( $cellAttributes );
 451
 452                 $field = Html::rawElement(
 453                         'td',
 454                         array( 'class' => 'mw-input' ) + $cellAttributes,
 455                         $inputHtml . "\n$errors"
 456                 );
 457
 458                 if ( $this->mHideIf ) {
 459                         $rowAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
 460                         $rowClasses .= ' mw-htmlform-hide-if';
 461                 }
 462
 463                 if ( $verticalLabel ) {
 464                         $html = Html::rawElement( 'tr',
 465                                 $rowAttributes + array( 'class' => "mw-htmlform-vertical-label $rowClasses" ), $label );
 466                         $html .= Html::rawElement( 'tr',
 467                                 $rowAttributes + array(
 468                                         'class' => "mw-htmlform-field-$fieldType {$this->mClass} $errorClass $rowClasses"
 469                                 ),
 470                                 $field );
 471                 } else {
 472                         $html =
 473                                 Html::rawElement( 'tr',
 474                                         $rowAttributes + array(
 475                                                 'class' => "mw-htmlform-field-$fieldType {$this->mClass} $errorClass $rowClasses"
 476                                         ),
 477                                         $label . $field );
 478                 }
 479
 480                 return $html . $helptext;
 481         }
 482
 483         /**
 484          * Get the complete div for the input, including help text,
 485          * labels, and whatever.
 486          * @since 1.20
 487          *
 488          * @param string $value The value to set the input to.
 489          *
 490          * @return string Complete HTML table row.
 491          */
 492         public function getDiv( $value ) {
 493                 list( $errors, $errorClass ) = $this->getErrorsAndErrorClass( $value );
 494                 $inputHtml = $this->getInputHTML( $value );
 495                 $fieldType = get_class( $this );
 496                 $helptext = $this->getHelpTextHtmlDiv( $this->getHelpText() );
 497                 $cellAttributes = array();
 498                 $label = $this->getLabelHtml( $cellAttributes );
 499
 500                 $outerDivClass = array(
 501                         'mw-input',
 502                         'mw-htmlform-nolabel' => ( $label === '' )
 503                 );
 504
 505                 $field = Html::rawElement(
 506                         'div',
 507                         array( 'class' => $outerDivClass ) + $cellAttributes,
 508                         $inputHtml . "\n$errors"
 509                 );
 510                 $divCssClasses = array( "mw-htmlform-field-$fieldType", $this->mClass, $errorClass );
 511                 if ( $this->mParent->isVForm() ) {
 512                         $divCssClasses[] = 'mw-ui-vform-field';
 513                 }
 514
 515                 $wrapperAttributes = array(
 516                         'class' => $divCssClasses,
 517                 );
 518                 if ( $this->mHideIf ) {
 519                         $wrapperAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
 520                         $wrapperAttributes['class'][] = ' mw-htmlform-hide-if';
 521                 }
 522                 $html = Html::rawElement( 'div', $wrapperAttributes, $label . $field );
 523                 $html .= $helptext;
 524
 525                 return $html;
 526         }
 527
 528         /**
 529          * Get the complete raw fields for the input, including help text,
 530          * labels, and whatever.
 531          * @since 1.20
 532          *
 533          * @param string $value The value to set the input to.
 534          *
 535          * @return string Complete HTML table row.
 536          */
 537         public function getRaw( $value ) {
 538                 list( $errors, ) = $this->getErrorsAndErrorClass( $value );
 539                 $inputHtml = $this->getInputHTML( $value );
 540                 $helptext = $this->getHelpTextHtmlRaw( $this->getHelpText() );
 541                 $cellAttributes = array();
 542                 $label = $this->getLabelHtml( $cellAttributes );
 543
 544                 $html = "\n$errors";
 545                 $html .= $label;
 546                 $html .= $inputHtml;
 547                 $html .= $helptext;
 548
 549                 return $html;
 550         }
 551
 552         /**
 553          * Generate help text HTML in table format
 554          * @since 1.20
 555          *
 556          * @param string|null $helptext
 557          * @return string
 558          */
 559         public function getHelpTextHtmlTable( $helptext ) {
 560                 if ( is_null( $helptext ) ) {
 561                         return '';
 562                 }
 563
 564                 $rowAttributes = array();
 565                 if ( $this->mHideIf ) {
 566                         $rowAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
 567                         $rowAttributes['class'] = 'mw-htmlform-hide-if';
 568                 }
 569
 570                 $tdClasses = array( 'htmlform-tip' );
 571                 if ( $this->mHelpClass !== false ) {
 572                         $tdClasses[] = $this->mHelpClass;
 573                 }
 574                 $row = Html::rawElement( 'td', array( 'colspan' => 2, 'class' => $tdClasses ), $helptext );
 575                 $row = Html::rawElement( 'tr', $rowAttributes, $row );
 576
 577                 return $row;
 578         }
 579
 580         /**
 581          * Generate help text HTML in div format
 582          * @since 1.20
 583          *
 584          * @param string|null $helptext
 585          *
 586          * @return string
 587          */
 588         public function getHelpTextHtmlDiv( $helptext ) {
 589                 if ( is_null( $helptext ) ) {
 590                         return '';
 591                 }
 592
 593                 $wrapperAttributes = array(
 594                         'class' => 'htmlform-tip',
 595                 );
 596                 if ( $this->mHelpClass !== false ) {
 597                         $wrapperAttributes['class'] .= " {$this->mHelpClass}";
 598                 }
 599                 if ( $this->mHideIf ) {
 600                         $wrapperAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
 601                         $wrapperAttributes['class'] .= ' mw-htmlform-hide-if';
 602                 }
 603                 $div = Html::rawElement( 'div', $wrapperAttributes, $helptext );
 604
 605                 return $div;
 606         }
 607
 608         /**
 609          * Generate help text HTML formatted for raw output
 610          * @since 1.20
 611          *
 612          * @param string|null $helptext
 613          * @return string
 614          */
 615         public function getHelpTextHtmlRaw( $helptext ) {
 616                 return $this->getHelpTextHtmlDiv( $helptext );
 617         }
 618
 619         /**
 620          * Determine the help text to display
 621          * @since 1.20
 622          * @return string
 623          */
 624         public function getHelpText() {
 625                 $helptext = null;
 626
 627                 if ( isset( $this->mParams['help-message'] ) ) {
 628                         $this->mParams['help-messages'] = array( $this->mParams['help-message'] );
 629                 }
 630
 631                 if ( isset( $this->mParams['help-messages'] ) ) {
 632                         foreach ( $this->mParams['help-messages'] as $name ) {
 633                                 $helpMessage = (array)$name;
 634                                 $msg = $this->msg( array_shift( $helpMessage ), $helpMessage );
 635
 636                                 if ( $msg->exists() ) {
 637                                         if ( is_null( $helptext ) ) {
 638                                                 $helptext = '';
 639                                         } else {
 640                                                 $helptext .= $this->msg( 'word-separator' )->escaped(); // some space
 641                                         }
 642                                         $helptext .= $msg->parse(); // Append message
 643                                 }
 644                         }
 645                 } elseif ( isset( $this->mParams['help'] ) ) {
 646                         $helptext = $this->mParams['help'];
 647                 }
 648
 649                 return $helptext;
 650         }
 651
 652         /**
 653          * Determine form errors to display and their classes
 654          * @since 1.20
 655          *
 656          * @param string $value The value of the input
 657          * @return array
 658          */
 659         public function getErrorsAndErrorClass( $value ) {
 660                 $errors = $this->validate( $value, $this->mParent->mFieldData );
 661
 662                 if ( is_bool( $errors ) || !$this->mParent->wasSubmitted() ) {
 663                         $errors = '';
 664                         $errorClass = '';
 665                 } else {
 666                         $errors = self::formatErrors( $errors );
 667                         $errorClass = 'mw-htmlform-invalid-input';
 668                 }
 669
 670                 return array( $errors, $errorClass );
 671         }
 672
 673         function getLabel() {
 674                 return is_null( $this->mLabel ) ? '' : $this->mLabel;
 675         }
 676
 677         function getLabelHtml( $cellAttributes = array() ) {
 678                 # Don't output a for= attribute for labels with no associated input.
 679                 # Kind of hacky here, possibly we don't want these to be <label>s at all.
 680                 $for = array();
 681
 682                 if ( $this->needsLabel() ) {
 683                         $for['for'] = $this->mID;
 684                 }
 685
 686                 $labelValue = trim( $this->getLabel() );
 687                 $hasLabel = false;
 688                 if ( $labelValue !== '&#160;' && $labelValue !== '' ) {
 689                         $hasLabel = true;
 690                 }
 691
 692                 $displayFormat = $this->mParent->getDisplayFormat();
 693                 $html = '';
 694
 695                 if ( $displayFormat === 'table' ) {
 696                         $html =
 697                                 Html::rawElement( 'td',
 698                                         array( 'class' => 'mw-label' ) + $cellAttributes,
 699                                         Html::rawElement( 'label', $for, $labelValue ) );
 700                 } elseif ( $hasLabel || $this->mShowEmptyLabels ) {
 701                         if ( $displayFormat === 'div' ) {
 702                                 $html =
 703                                         Html::rawElement( 'div',
 704                                                 array( 'class' => 'mw-label' ) + $cellAttributes,
 705                                                 Html::rawElement( 'label', $for, $labelValue ) );
 706                         } else {
 707                                 $html = Html::rawElement( 'label', $for, $labelValue );
 708                         }
 709                 }
 710
 711                 return $html;
 712         }
 713
 714         function getDefault() {
 715                 if ( isset( $this->mDefault ) ) {
 716                         return $this->mDefault;
 717                 } else {
 718                         return null;
 719                 }
 720         }
 721
 722         /**
 723          * Returns the attributes required for the tooltip and accesskey.
 724          *
 725          * @return array Attributes
 726          */
 727         public function getTooltipAndAccessKey() {
 728                 if ( empty( $this->mParams['tooltip'] ) ) {
 729                         return array();
 730                 }
 731
 732                 return Linker::tooltipAndAccesskeyAttribs( $this->mParams['tooltip'] );
 733         }
 734
 735         /**
 736          * Returns the given attributes from the parameters
 737          *
 738          * @param array $list List of attributes to get
 739          * @return array Attributes
 740          */
 741         public function getAttributes( array $list ) {
 742                 static $boolAttribs = array( 'disabled', 'required', 'autofocus', 'multiple', 'readonly' );
 743
 744                 $ret = array();
 745
 746                 foreach ( $list as $key ) {
 747                         if ( in_array( $key, $boolAttribs ) ) {
 748                                 if ( !empty( $this->mParams[$key] ) ) {
 749                                         $ret[$key] = '';
 750                                 }
 751                         } elseif ( isset( $this->mParams[$key] ) ) {
 752                                 $ret[$key] = $this->mParams[$key];
 753                         }
 754                 }
 755
 756                 return $ret;
 757         }
 758
 759         /**
 760          * Given an array of msg-key => value mappings, returns an array with keys
 761          * being the message texts. It also forces values to strings.
 762          *
 763          * @param array $options
 764          * @return array
 765          */
 766         private function lookupOptionsKeys( $options ) {
 767                 $ret = array();
 768                 foreach ( $options as $key => $value ) {
 769                         $key = $this->msg( $key )->plain();
 770                         $ret[$key] = is_array( $value )
 771                                 ? $this->lookupOptionsKeys( $value )
 772                                 : strval( $value );
 773                 }
 774                 return $ret;
 775         }
 776
 777         /**
 778          * Recursively forces values in an array to strings, because issues arise
 779          * with integer 0 as a value.
 780          *
 781          * @param array $array
 782          * @return array
 783          */
 784         static function forceToStringRecursive( $array ) {
 785                 if ( is_array( $array ) ) {
 786                         return array_map( array( __CLASS__, 'forceToStringRecursive' ), $array );
 787                 } else {
 788                         return strval( $array );
 789                 }
 790         }
 791
 792         /**
 793          * Fetch the array of options from the field's parameters. In order, this
 794          * checks 'options-messages', 'options', then 'options-message'.
 795          *
 796          * @return array|null Options array
 797          */
 798         public function getOptions() {
 799                 if ( $this->mOptions === false ) {
 800                         if ( array_key_exists( 'options-messages', $this->mParams ) ) {
 801                                 $this->mOptions = $this->lookupOptionsKeys( $this->mParams['options-messages'] );
 802                         } elseif ( array_key_exists( 'options', $this->mParams ) ) {
 803                                 $this->mOptionsLabelsNotFromMessage = true;
 804                                 $this->mOptions = self::forceToStringRecursive( $this->mParams['options'] );
 805                         } elseif ( array_key_exists( 'options-message', $this->mParams ) ) {
 806                                 /** @todo This is copied from Xml::listDropDown(), deprecate/avoid duplication? */
 807                                 $message = $this->msg( $this->mParams['options-message'] )->inContentLanguage()->plain();
 808
 809                                 $optgroup = false;
 810                                 $this->mOptions = array();
 811                                 foreach ( explode( "\n", $message ) as $option ) {
 812                                         $value = trim( $option );
 813                                         if ( $value == '' ) {
 814                                                 continue;
 815                                         } elseif ( substr( $value, 0, 1 ) == '*' && substr( $value, 1, 1 ) != '*' ) {
 816                                                 # A new group is starting...
 817                                                 $value = trim( substr( $value, 1 ) );
 818                                                 $optgroup = $value;
 819                                         } elseif ( substr( $value, 0, 2 ) == '**' ) {
 820                                                 # groupmember
 821                                                 $opt = trim( substr( $value, 2 ) );
 822                                                 if ( $optgroup === false ) {
 823                                                         $this->mOptions[$opt] = $opt;
 824                                                 } else {
 825                                                         $this->mOptions[$optgroup][$opt] = $opt;
 826                                                 }
 827                                         } else {
 828                                                 # groupless reason list
 829                                                 $optgroup = false;
 830                                                 $this->mOptions[$option] = $option;
 831                                         }
 832                                 }
 833                         } else {
 834                                 $this->mOptions = null;
 835                         }
 836                 }
 837
 838                 return $this->mOptions;
 839         }
 840
 841         /**
 842          * flatten an array of options to a single array, for instance,
 843          * a set of "<options>" inside "<optgroups>".
 844          *
 845          * @param array $options Associative Array with values either Strings or Arrays
 846          * @return array Flattened input
 847          */
 848         public static function flattenOptions( $options ) {
 849                 $flatOpts = array();
 850
 851                 foreach ( $options as $value ) {
 852                         if ( is_array( $value ) ) {
 853                                 $flatOpts = array_merge( $flatOpts, self::flattenOptions( $value ) );
 854                         } else {
 855                                 $flatOpts[] = $value;
 856                         }
 857                 }
 858
 859                 return $flatOpts;
 860         }
 861
 862         /**
 863          * Formats one or more errors as accepted by field validation-callback.
 864          *
 865          * @param string|Message|array $errors Array of strings or Message instances
 866          * @return string HTML
 867          * @since 1.18
 868          */
 869         protected static function formatErrors( $errors ) {
 870                 if ( is_array( $errors ) && count( $errors ) === 1 ) {
 871                         $errors = array_shift( $errors );
 872                 }
 873
 874                 if ( is_array( $errors ) ) {
 875                         $lines = array();
 876                         foreach ( $errors as $error ) {
 877                                 if ( $error instanceof Message ) {
 878                                         $lines[] = Html::rawElement( 'li', array(), $error->parse() );
 879                                 } else {
 880                                         $lines[] = Html::rawElement( 'li', array(), $error );
 881                                 }
 882                         }
 883
 884                         return Html::rawElement( 'ul', array( 'class' => 'error' ), implode( "\n", $lines ) );
 885                 } else {
 886                         if ( $errors instanceof Message ) {
 887                                 $errors = $errors->parse();
 888                         }
 889
 890                         return Html::rawElement( 'span', array( 'class' => 'error' ), $errors );
 891                 }
 892         }
 893 }