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 $mVFormClass = '';
  17         protected $mHelpClass = false;
  18         protected $mDefault;
  19         protected $mOptions = false;
  20         protected $mOptionsLabelsNotFromMessage = false;
  21         protected $mHideIf = null;
  22
  23         /**
  24          * @var bool If true will generate an empty div element with no label
  25          * @since 1.22
  26          */
  27         protected $mShowEmptyLabels = true;
  28
  29         /**
  30          * @var HTMLForm
  31          */
  32         public $mParent;
  33
  34         /**
  35          * This function must be implemented to return the HTML to generate
  36          * the input object itself.  It should not implement the surrounding
  37          * table cells/rows, or labels/help messages.
  38          *
  39          * @param string $value The value to set the input to; eg a default
  40          *     text for a text input.
  41          *
  42          * @return string Valid HTML.
  43          */
  44         abstract function getInputHTML( $value );
  45
  46         /**
  47          * Get a translated interface message
  48          *
  49          * This is a wrapper around $this->mParent->msg() if $this->mParent is set
  50          * and wfMessage() otherwise.
  51          *
  52          * Parameters are the same as wfMessage().
  53          *
  54          * @return Message
  55          */
  56         function msg() {
  57                 $args = func_get_args();
  58
  59                 if ( $this->mParent ) {
  60                         $callback = array( $this->mParent, 'msg' );
  61                 } else {
  62                         $callback = 'wfMessage';
  63                 }
  64
  65                 return call_user_func_array( $callback, $args );
  66         }
  67
  68
  69         /**
  70          * Fetch a field value from $alldata for the closest field matching a given
  71          * name.
  72          *
  73          * This is complex because it needs to handle array fields like the user
  74          * would expect. The general algorithm is to look for $name as a sibling
  75          * of $this, then a sibling of $this's parent, and so on. Keeping in mind
  76          * that $name itself might be referencing an array.
  77          *
  78          * @param array $alldata
  79          * @param string $name
  80          * @return string
  81          */
  82         protected function getNearestFieldByName( $alldata, $name ) {
  83                 $tmp = $this->mName;
  84                 $thisKeys = array();
  85                 while ( preg_match( '/^(.+)\[([^\]]+)\]$/', $tmp, $m ) ) {
  86                         array_unshift( $thisKeys, $m[2] );
  87                         $tmp = $m[1];
  88                 }
  89                 if ( substr( $tmp, 0, 2 ) == 'wp' &&
  90                         !isset( $alldata[$tmp] ) &&
  91                         isset( $alldata[substr( $tmp, 2 )] )
  92                 ) {
  93                         // Adjust for name mangling.
  94                         $tmp = substr( $tmp, 2 );
  95                 }
  96                 array_unshift( $thisKeys, $tmp );
  97
  98                 $tmp = $name;
  99                 $nameKeys = array();
 100                 while ( preg_match( '/^(.+)\[([^\]]+)\]$/', $tmp, $m ) ) {
 101                         array_unshift( $nameKeys, $m[2] );
 102                         $tmp = $m[1];
 103                 }
 104                 array_unshift( $nameKeys, $tmp );
 105
 106                 $testValue = '';
 107                 for ( $i = count( $thisKeys ) - 1; $i >= 0; $i-- ) {
 108                         $keys = array_merge( array_slice( $thisKeys, 0, $i ), $nameKeys );
 109                         $data = $alldata;
 110                         while ( $keys ) {
 111                                 $key = array_shift( $keys );
 112                                 if ( !is_array( $data ) || !isset( $data[$key] ) ) {
 113                                         continue 2;
 114                                 }
 115                                 $data = $data[$key];
 116                         }
 117                         $testValue = (string)$data;
 118                         break;
 119                 }
 120
 121                 return $testValue;
 122         }
 123
 124         /**
 125          * Helper function for isHidden to handle recursive data structures.
 126          *
 127          * @param array $alldata
 128          * @param array $params
 129          * @return bool
 130          * @throws MWException
 131          */
 132         protected function isHiddenRecurse( array $alldata, array $params ) {
 133                 $origParams = $params;
 134                 $op = array_shift( $params );
 135
 136                 try {
 137                         switch ( $op ) {
 138                                 case 'AND':
 139                                         foreach ( $params as $i => $p ) {
 140                                                 if ( !is_array( $p ) ) {
 141                                                         throw new MWException(
 142                                                                 "Expected array, found " . gettype( $p ) . " at index $i"
 143                                                         );
 144                                                 }
 145                                                 if ( !$this->isHiddenRecurse( $alldata, $p ) ) {
 146                                                         return false;
 147                                                 }
 148                                         }
 149                                         return true;
 150
 151                                 case 'OR':
 152                                         foreach ( $params as $p ) {
 153                                                 if ( !is_array( $p ) ) {
 154                                                         throw new MWException(
 155                                                                 "Expected array, found " . gettype( $p ) . " at index $i"
 156                                                         );
 157                                                 }
 158                                                 if ( $this->isHiddenRecurse( $alldata, $p ) ) {
 159                                                         return true;
 160                                                 }
 161                                         }
 162                                         return false;
 163
 164                                 case 'NAND':
 165                                         foreach ( $params as $i => $p ) {
 166                                                 if ( !is_array( $p ) ) {
 167                                                         throw new MWException(
 168                                                                 "Expected array, found " . gettype( $p ) . " at index $i"
 169                                                         );
 170                                                 }
 171                                                 if ( !$this->isHiddenRecurse( $alldata, $p ) ) {
 172                                                         return true;
 173                                                 }
 174                                         }
 175                                         return false;
 176
 177                                 case 'NOR':
 178                                         foreach ( $params as $p ) {
 179                                                 if ( !is_array( $p ) ) {
 180                                                         throw new MWException(
 181                                                                 "Expected array, found " . gettype( $p ) . " at index $i"
 182                                                         );
 183                                                 }
 184                                                 if ( $this->isHiddenRecurse( $alldata, $p ) ) {
 185                                                         return false;
 186                                                 }
 187                                         }
 188                                         return true;
 189
 190                                 case 'NOT':
 191                                         if ( count( $params ) !== 1 ) {
 192                                                 throw new MWException( "NOT takes exactly one parameter" );
 193                                         }
 194                                         $p = $params[0];
 195                                         if ( !is_array( $p ) ) {
 196                                                 throw new MWException(
 197                                                         "Expected array, found " . gettype( $p ) . " at index 0"
 198                                                 );
 199                                         }
 200                                         return !$this->isHiddenRecurse( $alldata, $p );
 201
 202                                 case '===':
 203                                 case '!==':
 204                                         if ( count( $params ) !== 2 ) {
 205                                                 throw new MWException( "$op takes exactly two parameters" );
 206                                         }
 207                                         list( $field, $value ) = $params;
 208                                         if ( !is_string( $field ) || !is_string( $value ) ) {
 209                                                 throw new MWException( "Parameters for $op must be strings" );
 210                                         }
 211                                         $testValue = $this->getNearestFieldByName( $alldata, $field );
 212                                         switch ( $op ) {
 213                                                 case '===':
 214                                                         return ( $value === $testValue );
 215                                                 case '!==':
 216                                                         return ( $value !== $testValue );
 217                                         }
 218
 219                                 default:
 220                                         throw new MWException( "Unknown operation" );
 221                         }
 222                 } catch ( Exception $ex ) {
 223                         throw new MWException(
 224                                 "Invalid hide-if specification for $this->mName: " .
 225                                 $ex->getMessage() . " in " . var_export( $origParams, true ),
 226                                 0, $ex
 227                         );
 228                 }
 229         }
 230
 231         /**
 232          * Test whether this field is supposed to be hidden, based on the values of
 233          * the other form fields.
 234          *
 235          * @since 1.23
 236          * @param array $alldata The data collected from the form
 237          * @return bool
 238          */
 239         function isHidden( $alldata ) {
 240                 if ( !$this->mHideIf ) {
 241                         return false;
 242                 }
 243
 244                 return $this->isHiddenRecurse( $alldata, $this->mHideIf );
 245         }
 246
 247         /**
 248          * Override this function if the control can somehow trigger a form
 249          * submission that shouldn't actually submit the HTMLForm.
 250          *
 251          * @since 1.23
 252          * @param string|array $value The value the field was submitted with
 253          * @param array $alldata The data collected from the form
 254          *
 255          * @return bool True to cancel the submission
 256          */
 257         function cancelSubmit( $value, $alldata ) {
 258                 return false;
 259         }
 260
 261         /**
 262          * Override this function to add specific validation checks on the
 263          * field input.  Don't forget to call parent::validate() to ensure
 264          * that the user-defined callback mValidationCallback is still run
 265          *
 266          * @param string|array $value The value the field was submitted with
 267          * @param array $alldata The data collected from the form
 268          *
 269          * @return bool|string True on success, or String error to display, or
 270          *   false to fail validation without displaying an error.
 271          */
 272         function validate( $value, $alldata ) {
 273                 if ( $this->isHidden( $alldata ) ) {
 274                         return true;
 275                 }
 276
 277                 if ( isset( $this->mParams['required'] )
 278                         && $this->mParams['required'] !== false
 279                         && $value === ''
 280                 ) {
 281                         return $this->msg( 'htmlform-required' )->parse();
 282                 }
 283
 284                 if ( isset( $this->mValidationCallback ) ) {
 285                         return call_user_func( $this->mValidationCallback, $value, $alldata, $this->mParent );
 286                 }
 287
 288                 return true;
 289         }
 290
 291         function filter( $value, $alldata ) {
 292                 if ( isset( $this->mFilterCallback ) ) {
 293                         $value = call_user_func( $this->mFilterCallback, $value, $alldata, $this->mParent );
 294                 }
 295
 296                 return $value;
 297         }
 298
 299         /**
 300          * Should this field have a label, or is there no input element with the
 301          * appropriate id for the label to point to?
 302          *
 303          * @return bool True to output a label, false to suppress
 304          */
 305         protected function needsLabel() {
 306                 return true;
 307         }
 308
 309         /**
 310          * Tell the field whether to generate a separate label element if its label
 311          * is blank.
 312          *
 313          * @since 1.22
 314          *
 315          * @param bool $show Set to false to not generate a label.
 316          * @return void
 317          */
 318         public function setShowEmptyLabel( $show ) {
 319                 $this->mShowEmptyLabels = $show;
 320         }
 321
 322         /**
 323          * Get the value that this input has been set to from a posted form,
 324          * or the input's default value if it has not been set.
 325          *
 326          * @param WebRequest $request
 327          * @return string The value
 328          */
 329         function loadDataFromRequest( $request ) {
 330                 if ( $request->getCheck( $this->mName ) ) {
 331                         return $request->getText( $this->mName );
 332                 } else {
 333                         return $this->getDefault();
 334                 }
 335         }
 336
 337         /**
 338          * Initialise the object
 339          *
 340          * @param array $params Associative Array. See HTMLForm doc for syntax.
 341          *
 342          * @since 1.22 The 'label' attribute no longer accepts raw HTML, use 'label-raw' instead
 343          * @throws MWException
 344          */
 345         function __construct( $params ) {
 346                 $this->mParams = $params;
 347
 348                 if ( isset( $params['parent'] ) && $params['parent'] instanceof HTMLForm ) {
 349                         $this->mParent = $params['parent'];
 350                 }
 351
 352                 # Generate the label from a message, if possible
 353                 if ( isset( $params['label-message'] ) ) {
 354                         $msgInfo = $params['label-message'];
 355
 356                         if ( is_array( $msgInfo ) ) {
 357                                 $msg = array_shift( $msgInfo );
 358                         } else {
 359                                 $msg = $msgInfo;
 360                                 $msgInfo = array();
 361                         }
 362
 363                         $this->mLabel = $this->msg( $msg, $msgInfo )->parse();
 364                 } elseif ( isset( $params['label'] ) ) {
 365                         if ( $params['label'] === '&#160;' ) {
 366                                 // Apparently some things set &nbsp directly and in an odd format
 367                                 $this->mLabel = '&#160;';
 368                         } else {
 369                                 $this->mLabel = htmlspecialchars( $params['label'] );
 370                         }
 371                 } elseif ( isset( $params['label-raw'] ) ) {
 372                         $this->mLabel = $params['label-raw'];
 373                 }
 374
 375                 $this->mName = "wp{$params['fieldname']}";
 376                 if ( isset( $params['name'] ) ) {
 377                         $this->mName = $params['name'];
 378                 }
 379
 380                 $validName = Sanitizer::escapeId( $this->mName );
 381                 $validName = str_replace( array( '.5B', '.5D' ), array( '[', ']' ), $validName );
 382                 if ( $this->mName != $validName && !isset( $params['nodata'] ) ) {
 383                         throw new MWException( "Invalid name '{$this->mName}' passed to " . __METHOD__ );
 384                 }
 385
 386                 $this->mID = "mw-input-{$this->mName}";
 387
 388                 if ( isset( $params['default'] ) ) {
 389                         $this->mDefault = $params['default'];
 390                 }
 391
 392                 if ( isset( $params['id'] ) ) {
 393                         $id = $params['id'];
 394                         $validId = Sanitizer::escapeId( $id );
 395
 396                         if ( $id != $validId ) {
 397                                 throw new MWException( "Invalid id '$id' passed to " . __METHOD__ );
 398                         }
 399
 400                         $this->mID = $id;
 401                 }
 402
 403                 if ( isset( $params['cssclass'] ) ) {
 404                         $this->mClass = $params['cssclass'];
 405                 }
 406
 407                 if ( isset( $params['csshelpclass'] ) ) {
 408                         $this->mHelpClass = $params['csshelpclass'];
 409                 }
 410
 411                 if ( isset( $params['validation-callback'] ) ) {
 412                         $this->mValidationCallback = $params['validation-callback'];
 413                 }
 414
 415                 if ( isset( $params['filter-callback'] ) ) {
 416                         $this->mFilterCallback = $params['filter-callback'];
 417                 }
 418
 419                 if ( isset( $params['flatlist'] ) ) {
 420                         $this->mClass .= ' mw-htmlform-flatlist';
 421                 }
 422
 423                 if ( isset( $params['hidelabel'] ) ) {
 424                         $this->mShowEmptyLabels = false;
 425                 }
 426
 427                 if ( isset( $params['hide-if'] ) ) {
 428                         $this->mHideIf = $params['hide-if'];
 429                 }
 430         }
 431
 432         /**
 433          * Get the complete table row for the input, including help text,
 434          * labels, and whatever.
 435          *
 436          * @param string $value The value to set the input to.
 437          *
 438          * @return string Complete HTML table row.
 439          */
 440         function getTableRow( $value ) {
 441                 list( $errors, $errorClass ) = $this->getErrorsAndErrorClass( $value );
 442                 $inputHtml = $this->getInputHTML( $value );
 443                 $fieldType = get_class( $this );
 444                 $helptext = $this->getHelpTextHtmlTable( $this->getHelpText() );
 445                 $cellAttributes = array();
 446                 $rowAttributes = array();
 447                 $rowClasses = '';
 448
 449                 if ( !empty( $this->mParams['vertical-label'] ) ) {
 450                         $cellAttributes['colspan'] = 2;
 451                         $verticalLabel = true;
 452                 } else {
 453                         $verticalLabel = false;
 454                 }
 455
 456                 $label = $this->getLabelHtml( $cellAttributes );
 457
 458                 $field = Html::rawElement(
 459                         'td',
 460                         array( 'class' => 'mw-input' ) + $cellAttributes,
 461                         $inputHtml . "\n$errors"
 462                 );
 463
 464                 if ( $this->mHideIf ) {
 465                         $rowAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
 466                         $rowClasses .= ' mw-htmlform-hide-if';
 467                 }
 468
 469                 if ( $verticalLabel ) {
 470                         $html = Html::rawElement( 'tr',
 471                                 $rowAttributes + array( 'class' => "mw-htmlform-vertical-label $rowClasses" ), $label );
 472                         $html .= Html::rawElement( 'tr',
 473                                 $rowAttributes + array(
 474                                         'class' => "mw-htmlform-field-$fieldType {$this->mClass} $errorClass $rowClasses"
 475                                 ),
 476                                 $field );
 477                 } else {
 478                         $html =
 479                                 Html::rawElement( 'tr',
 480                                         $rowAttributes + array(
 481                                                 'class' => "mw-htmlform-field-$fieldType {$this->mClass} $errorClass $rowClasses"
 482                                         ),
 483                                         $label . $field );
 484                 }
 485
 486                 return $html . $helptext;
 487         }
 488
 489         /**
 490          * Get the complete div for the input, including help text,
 491          * labels, and whatever.
 492          * @since 1.20
 493          *
 494          * @param string $value The value to set the input to.
 495          *
 496          * @return string Complete HTML table row.
 497          */
 498         public function getDiv( $value ) {
 499                 list( $errors, $errorClass ) = $this->getErrorsAndErrorClass( $value );
 500                 $inputHtml = $this->getInputHTML( $value );
 501                 $fieldType = get_class( $this );
 502                 $helptext = $this->getHelpTextHtmlDiv( $this->getHelpText() );
 503                 $cellAttributes = array();
 504                 $label = $this->getLabelHtml( $cellAttributes );
 505
 506                 $outerDivClass = array(
 507                         'mw-input',
 508                         'mw-htmlform-nolabel' => ( $label === '' )
 509                 );
 510
 511                 $field = Html::rawElement(
 512                         'div',
 513                         array( 'class' => $outerDivClass ) + $cellAttributes,
 514                         $inputHtml . "\n$errors"
 515                 );
 516                 $divCssClasses = array( "mw-htmlform-field-$fieldType", $this->mClass, $this->mVFormClass, $errorClass );
 517
 518                 $wrapperAttributes = array(
 519                         'class' => $divCssClasses,
 520                 );
 521                 if ( $this->mHideIf ) {
 522                         $wrapperAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
 523                         $wrapperAttributes['class'][] = ' mw-htmlform-hide-if';
 524                 }
 525                 $html = Html::rawElement( 'div', $wrapperAttributes, $label . $field );
 526                 $html .= $helptext;
 527
 528                 return $html;
 529         }
 530
 531         /**
 532          * Get the complete raw fields for the input, including help text,
 533          * labels, and whatever.
 534          * @since 1.20
 535          *
 536          * @param string $value The value to set the input to.
 537          *
 538          * @return string Complete HTML table row.
 539          */
 540         public function getRaw( $value ) {
 541                 list( $errors, ) = $this->getErrorsAndErrorClass( $value );
 542                 $inputHtml = $this->getInputHTML( $value );
 543                 $helptext = $this->getHelpTextHtmlRaw( $this->getHelpText() );
 544                 $cellAttributes = array();
 545                 $label = $this->getLabelHtml( $cellAttributes );
 546
 547                 $html = "\n$errors";
 548                 $html .= $label;
 549                 $html .= $inputHtml;
 550                 $html .= $helptext;
 551
 552                 return $html;
 553         }
 554
 555         /**
 556          * Get the complete field for the input, including help text,
 557          * labels, and whatever. Fall back from 'vform' to 'div' when not overridden.
 558          *
 559          * @since 1.25
 560          * @param string $value The value to set the input to.
 561          * @return string Complete HTML field.
 562          */
 563         public function getVForm( $value ) {
 564                 // Ewwww
 565                 $this->mVFormClass = ' mw-ui-vform-field';
 566                 return $this->getDiv( $value );
 567         }
 568
 569         /**
 570          * Generate help text HTML in table format
 571          * @since 1.20
 572          *
 573          * @param string|null $helptext
 574          * @return string
 575          */
 576         public function getHelpTextHtmlTable( $helptext ) {
 577                 if ( is_null( $helptext ) ) {
 578                         return '';
 579                 }
 580
 581                 $rowAttributes = array();
 582                 if ( $this->mHideIf ) {
 583                         $rowAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
 584                         $rowAttributes['class'] = 'mw-htmlform-hide-if';
 585                 }
 586
 587                 $tdClasses = array( 'htmlform-tip' );
 588                 if ( $this->mHelpClass !== false ) {
 589                         $tdClasses[] = $this->mHelpClass;
 590                 }
 591                 $row = Html::rawElement( 'td', array( 'colspan' => 2, 'class' => $tdClasses ), $helptext );
 592                 $row = Html::rawElement( 'tr', $rowAttributes, $row );
 593
 594                 return $row;
 595         }
 596
 597         /**
 598          * Generate help text HTML in div format
 599          * @since 1.20
 600          *
 601          * @param string|null $helptext
 602          *
 603          * @return string
 604          */
 605         public function getHelpTextHtmlDiv( $helptext ) {
 606                 if ( is_null( $helptext ) ) {
 607                         return '';
 608                 }
 609
 610                 $wrapperAttributes = array(
 611                         'class' => 'htmlform-tip',
 612                 );
 613                 if ( $this->mHelpClass !== false ) {
 614                         $wrapperAttributes['class'] .= " {$this->mHelpClass}";
 615                 }
 616                 if ( $this->mHideIf ) {
 617                         $wrapperAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
 618                         $wrapperAttributes['class'] .= ' mw-htmlform-hide-if';
 619                 }
 620                 $div = Html::rawElement( 'div', $wrapperAttributes, $helptext );
 621
 622                 return $div;
 623         }
 624
 625         /**
 626          * Generate help text HTML formatted for raw output
 627          * @since 1.20
 628          *
 629          * @param string|null $helptext
 630          * @return string
 631          */
 632         public function getHelpTextHtmlRaw( $helptext ) {
 633                 return $this->getHelpTextHtmlDiv( $helptext );
 634         }
 635
 636         /**
 637          * Determine the help text to display
 638          * @since 1.20
 639          * @return string
 640          */
 641         public function getHelpText() {
 642                 $helptext = null;
 643
 644                 if ( isset( $this->mParams['help-message'] ) ) {
 645                         $this->mParams['help-messages'] = array( $this->mParams['help-message'] );
 646                 }
 647
 648                 if ( isset( $this->mParams['help-messages'] ) ) {
 649                         foreach ( $this->mParams['help-messages'] as $name ) {
 650                                 $helpMessage = (array)$name;
 651                                 $msg = $this->msg( array_shift( $helpMessage ), $helpMessage );
 652
 653                                 if ( $msg->exists() ) {
 654                                         if ( is_null( $helptext ) ) {
 655                                                 $helptext = '';
 656                                         } else {
 657                                                 $helptext .= $this->msg( 'word-separator' )->escaped(); // some space
 658                                         }
 659                                         $helptext .= $msg->parse(); // Append message
 660                                 }
 661                         }
 662                 } elseif ( isset( $this->mParams['help'] ) ) {
 663                         $helptext = $this->mParams['help'];
 664                 }
 665
 666                 return $helptext;
 667         }
 668
 669         /**
 670          * Determine form errors to display and their classes
 671          * @since 1.20
 672          *
 673          * @param string $value The value of the input
 674          * @return array
 675          */
 676         public function getErrorsAndErrorClass( $value ) {
 677                 $errors = $this->validate( $value, $this->mParent->mFieldData );
 678
 679                 if ( is_bool( $errors ) || !$this->mParent->wasSubmitted() ) {
 680                         $errors = '';
 681                         $errorClass = '';
 682                 } else {
 683                         $errors = self::formatErrors( $errors );
 684                         $errorClass = 'mw-htmlform-invalid-input';
 685                 }
 686
 687                 return array( $errors, $errorClass );
 688         }
 689
 690         function getLabel() {
 691                 return is_null( $this->mLabel ) ? '' : $this->mLabel;
 692         }
 693
 694         function getLabelHtml( $cellAttributes = array() ) {
 695                 # Don't output a for= attribute for labels with no associated input.
 696                 # Kind of hacky here, possibly we don't want these to be <label>s at all.
 697                 $for = array();
 698
 699                 if ( $this->needsLabel() ) {
 700                         $for['for'] = $this->mID;
 701                 }
 702
 703                 $labelValue = trim( $this->getLabel() );
 704                 $hasLabel = false;
 705                 if ( $labelValue !== '&#160;' && $labelValue !== '' ) {
 706                         $hasLabel = true;
 707                 }
 708
 709                 $displayFormat = $this->mParent->getDisplayFormat();
 710                 $html = '';
 711
 712                 if ( $displayFormat === 'table' ) {
 713                         $html =
 714                                 Html::rawElement( 'td',
 715                                         array( 'class' => 'mw-label' ) + $cellAttributes,
 716                                         Html::rawElement( 'label', $for, $labelValue ) );
 717                 } elseif ( $hasLabel || $this->mShowEmptyLabels ) {
 718                         if ( $displayFormat === 'div' ) {
 719                                 $html =
 720                                         Html::rawElement( 'div',
 721                                                 array( 'class' => 'mw-label' ) + $cellAttributes,
 722                                                 Html::rawElement( 'label', $for, $labelValue ) );
 723                         } else {
 724                                 $html = Html::rawElement( 'label', $for, $labelValue );
 725                         }
 726                 }
 727
 728                 return $html;
 729         }
 730
 731         function getDefault() {
 732                 if ( isset( $this->mDefault ) ) {
 733                         return $this->mDefault;
 734                 } else {
 735                         return null;
 736                 }
 737         }
 738
 739         /**
 740          * Returns the attributes required for the tooltip and accesskey.
 741          *
 742          * @return array Attributes
 743          */
 744         public function getTooltipAndAccessKey() {
 745                 if ( empty( $this->mParams['tooltip'] ) ) {
 746                         return array();
 747                 }
 748
 749                 return Linker::tooltipAndAccesskeyAttribs( $this->mParams['tooltip'] );
 750         }
 751
 752         /**
 753          * Returns the given attributes from the parameters
 754          *
 755          * @param array $list List of attributes to get
 756          * @return array Attributes
 757          */
 758         public function getAttributes( array $list ) {
 759                 static $boolAttribs = array( 'disabled', 'required', 'autofocus', 'multiple', 'readonly' );
 760
 761                 $ret = array();
 762
 763                 foreach ( $list as $key ) {
 764                         if ( in_array( $key, $boolAttribs ) ) {
 765                                 if ( !empty( $this->mParams[$key] ) ) {
 766                                         $ret[$key] = '';
 767                                 }
 768                         } elseif ( isset( $this->mParams[$key] ) ) {
 769                                 $ret[$key] = $this->mParams[$key];
 770                         }
 771                 }
 772
 773                 return $ret;
 774         }
 775
 776         /**
 777          * Given an array of msg-key => value mappings, returns an array with keys
 778          * being the message texts. It also forces values to strings.
 779          *
 780          * @param array $options
 781          * @return array
 782          */
 783         private function lookupOptionsKeys( $options ) {
 784                 $ret = array();
 785                 foreach ( $options as $key => $value ) {
 786                         $key = $this->msg( $key )->plain();
 787                         $ret[$key] = is_array( $value )
 788                                 ? $this->lookupOptionsKeys( $value )
 789                                 : strval( $value );
 790                 }
 791                 return $ret;
 792         }
 793
 794         /**
 795          * Recursively forces values in an array to strings, because issues arise
 796          * with integer 0 as a value.
 797          *
 798          * @param array $array
 799          * @return array
 800          */
 801         static function forceToStringRecursive( $array ) {
 802                 if ( is_array( $array ) ) {
 803                         return array_map( array( __CLASS__, 'forceToStringRecursive' ), $array );
 804                 } else {
 805                         return strval( $array );
 806                 }
 807         }
 808
 809         /**
 810          * Fetch the array of options from the field's parameters. In order, this
 811          * checks 'options-messages', 'options', then 'options-message'.
 812          *
 813          * @return array|null Options array
 814          */
 815         public function getOptions() {
 816                 if ( $this->mOptions === false ) {
 817                         if ( array_key_exists( 'options-messages', $this->mParams ) ) {
 818                                 $this->mOptions = $this->lookupOptionsKeys( $this->mParams['options-messages'] );
 819                         } elseif ( array_key_exists( 'options', $this->mParams ) ) {
 820                                 $this->mOptionsLabelsNotFromMessage = true;
 821                                 $this->mOptions = self::forceToStringRecursive( $this->mParams['options'] );
 822                         } elseif ( array_key_exists( 'options-message', $this->mParams ) ) {
 823                                 /** @todo This is copied from Xml::listDropDown(), deprecate/avoid duplication? */
 824                                 $message = $this->msg( $this->mParams['options-message'] )->inContentLanguage()->plain();
 825
 826                                 $optgroup = false;
 827                                 $this->mOptions = array();
 828                                 foreach ( explode( "\n", $message ) as $option ) {
 829                                         $value = trim( $option );
 830                                         if ( $value == '' ) {
 831                                                 continue;
 832                                         } elseif ( substr( $value, 0, 1 ) == '*' && substr( $value, 1, 1 ) != '*' ) {
 833                                                 # A new group is starting...
 834                                                 $value = trim( substr( $value, 1 ) );
 835                                                 $optgroup = $value;
 836                                         } elseif ( substr( $value, 0, 2 ) == '**' ) {
 837                                                 # groupmember
 838                                                 $opt = trim( substr( $value, 2 ) );
 839                                                 if ( $optgroup === false ) {
 840                                                         $this->mOptions[$opt] = $opt;
 841                                                 } else {
 842                                                         $this->mOptions[$optgroup][$opt] = $opt;
 843                                                 }
 844                                         } else {
 845                                                 # groupless reason list
 846                                                 $optgroup = false;
 847                                                 $this->mOptions[$option] = $option;
 848                                         }
 849                                 }
 850                         } else {
 851                                 $this->mOptions = null;
 852                         }
 853                 }
 854
 855                 return $this->mOptions;
 856         }
 857
 858         /**
 859          * flatten an array of options to a single array, for instance,
 860          * a set of "<options>" inside "<optgroups>".
 861          *
 862          * @param array $options Associative Array with values either Strings or Arrays
 863          * @return array Flattened input
 864          */
 865         public static function flattenOptions( $options ) {
 866                 $flatOpts = array();
 867
 868                 foreach ( $options as $value ) {
 869                         if ( is_array( $value ) ) {
 870                                 $flatOpts = array_merge( $flatOpts, self::flattenOptions( $value ) );
 871                         } else {
 872                                 $flatOpts[] = $value;
 873                         }
 874                 }
 875
 876                 return $flatOpts;
 877         }
 878
 879         /**
 880          * Formats one or more errors as accepted by field validation-callback.
 881          *
 882          * @param string|Message|array $errors Array of strings or Message instances
 883          * @return string HTML
 884          * @since 1.18
 885          */
 886         protected static function formatErrors( $errors ) {
 887                 if ( is_array( $errors ) && count( $errors ) === 1 ) {
 888                         $errors = array_shift( $errors );
 889                 }
 890
 891                 if ( is_array( $errors ) ) {
 892                         $lines = array();
 893                         foreach ( $errors as $error ) {
 894                                 if ( $error instanceof Message ) {
 895                                         $lines[] = Html::rawElement( 'li', array(), $error->parse() );
 896                                 } else {
 897                                         $lines[] = Html::rawElement( 'li', array(), $error );
 898                                 }
 899                         }
 900
 901                         return Html::rawElement( 'ul', array( 'class' => 'error' ), implode( "\n", $lines ) );
 902                 } else {
 903                         if ( $errors instanceof Message ) {
 904                                 $errors = $errors->parse();
 905                         }
 906
 907                         return Html::rawElement( 'span', array( 'class' => 'error' ), $errors );
 908                 }
 909         }
 910 }