includes/htmlform/HTMLForm.php

   1 <?php
   2
   3 /**
   4  * HTML form generation and submission handling.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  19  * http://www.gnu.org/copyleft/gpl.html
  20  *
  21  * @file
  22  */
  23
  24 /**
  25  * Object handling generic submission, CSRF protection, layout and
  26  * other logic for UI forms. in a reusable manner.
  27  *
  28  * In order to generate the form, the HTMLForm object takes an array
  29  * structure detailing the form fields available. Each element of the
  30  * array is a basic property-list, including the type of field, the
  31  * label it is to be given in the form, callbacks for validation and
  32  * 'filtering', and other pertinent information.
  33  *
  34  * Field types are implemented as subclasses of the generic HTMLFormField
  35  * object, and typically implement at least getInputHTML, which generates
  36  * the HTML for the input field to be placed in the table.
  37  *
  38  * You can find extensive documentation on the www.mediawiki.org wiki:
  39  *  - https://www.mediawiki.org/wiki/HTMLForm
  40  *  - https://www.mediawiki.org/wiki/HTMLForm/tutorial
  41  *
  42  * The constructor input is an associative array of $fieldname => $info,
  43  * where $info is an Associative Array with any of the following:
  44  *
  45  *    'class'               -- the subclass of HTMLFormField that will be used
  46  *                             to create the object.  *NOT* the CSS class!
  47  *    'type'                -- roughly translates into the <select> type attribute.
  48  *                             if 'class' is not specified, this is used as a map
  49  *                             through HTMLForm::$typeMappings to get the class name.
  50  *    'default'             -- default value when the form is displayed
  51  *    'id'                  -- HTML id attribute
  52  *    'cssclass'            -- CSS class
  53  *    'csshelpclass'        -- CSS class used to style help text
  54  *    'dir'                 -- Direction of the element.
  55  *    'options'             -- associative array mapping labels to values.
  56  *                             Some field types support multi-level arrays.
  57  *    'options-messages'    -- associative array mapping message keys to values.
  58  *                             Some field types support multi-level arrays.
  59  *    'options-message'     -- message key to be parsed to extract the list of
  60  *                             options (like 'ipbreason-dropdown').
  61  *    'label-message'       -- message key for a message to use as the label.
  62  *                             can be an array of msg key and then parameters to
  63  *                             the message.
  64  *    'label'               -- alternatively, a raw text message. Overridden by
  65  *                             label-message
  66  *    'help'                -- message text for a message to use as a help text.
  67  *    'help-message'        -- message key for a message to use as a help text.
  68  *                             can be an array of msg key and then parameters to
  69  *                             the message.
  70  *                             Overwrites 'help-messages' and 'help'.
  71  *    'help-messages'       -- array of message key. As above, each item can
  72  *                             be an array of msg key and then parameters.
  73  *                             Overwrites 'help'.
  74  *    'required'            -- passed through to the object, indicating that it
  75  *                             is a required field.
  76  *    'size'                -- the length of text fields
  77  *    'filter-callback      -- a function name to give you the chance to
  78  *                             massage the inputted value before it's processed.
  79  *                             @see HTMLFormField::filter()
  80  *    'validation-callback' -- a function name to give you the chance
  81  *                             to impose extra validation on the field input.
  82  *                             @see HTMLFormField::validate()
  83  *    'name'                -- By default, the 'name' attribute of the input field
  84  *                             is "wp{$fieldname}".  If you want a different name
  85  *                             (eg one without the "wp" prefix), specify it here and
  86  *                             it will be used without modification.
  87  *    'hide-if'             -- expression given as an array stating when the field
  88  *                             should be hidden. The first array value has to be the
  89  *                             expression's logic operator. Supported expressions:
  90  *                               'NOT'
  91  *                                 [ 'NOT', array $expression ]
  92  *                                 To hide a field if a given expression is not true.
  93  *                               '==='
  94  *                                 [ '===', string $fieldName, string $value ]
  95  *                                 To hide a field if another field identified by
  96  *                                 $field has the value $value.
  97  *                               '!=='
  98  *                                 [ '!==', string $fieldName, string $value ]
  99  *                                 Same as [ 'NOT', [ '===', $fieldName, $value ]
 100  *                               'OR', 'AND', 'NOR', 'NAND'
 101  *                                 [ 'XXX', array $expression1, ..., array $expressionN ]
 102  *                                 To hide a field if one or more (OR), all (AND),
 103  *                                 neither (NOR) or not all (NAND) given expressions
 104  *                                 are evaluated as true.
 105  *                             The expressions will be given to a JavaScript frontend
 106  *                             module which will continually update the field's
 107  *                             visibility.
 108  *
 109  * Since 1.20, you can chain mutators to ease the form generation:
 110  * @par Example:
 111  * @code
 112  * $form = new HTMLForm( $someFields );
 113  * $form->setMethod( 'get' )
 114  *      ->setWrapperLegendMsg( 'message-key' )
 115  *      ->prepareForm()
 116  *      ->displayForm( '' );
 117  * @endcode
 118  * Note that you will have prepareForm and displayForm at the end. Other
 119  * methods call done after that would simply not be part of the form :(
 120  *
 121  * @todo Document 'section' / 'subsection' stuff
 122  */
 123 class HTMLForm extends ContextSource {
 124         // A mapping of 'type' inputs onto standard HTMLFormField subclasses
 125         public static $typeMappings = array(
 126                 'api' => 'HTMLApiField',
 127                 'text' => 'HTMLTextField',
 128                 'textwithbutton' => 'HTMLTextFieldWithButton',
 129                 'textarea' => 'HTMLTextAreaField',
 130                 'select' => 'HTMLSelectField',
 131                 'radio' => 'HTMLRadioField',
 132                 'multiselect' => 'HTMLMultiSelectField',
 133                 'limitselect' => 'HTMLSelectLimitField',
 134                 'check' => 'HTMLCheckField',
 135                 'toggle' => 'HTMLCheckField',
 136                 'int' => 'HTMLIntField',
 137                 'float' => 'HTMLFloatField',
 138                 'info' => 'HTMLInfoField',
 139                 'selectorother' => 'HTMLSelectOrOtherField',
 140                 'selectandother' => 'HTMLSelectAndOtherField',
 141                 'namespaceselect' => 'HTMLSelectNamespace',
 142                 'namespaceselectwithbutton' => 'HTMLSelectNamespaceWithButton',
 143                 'tagfilter' => 'HTMLTagFilter',
 144                 'submit' => 'HTMLSubmitField',
 145                 'hidden' => 'HTMLHiddenField',
 146                 'edittools' => 'HTMLEditTools',
 147                 'checkmatrix' => 'HTMLCheckMatrix',
 148                 'cloner' => 'HTMLFormFieldCloner',
 149                 'autocompleteselect' => 'HTMLAutoCompleteSelectField',
 150                 // HTMLTextField will output the correct type="" attribute automagically.
 151                 // There are about four zillion other HTML5 input types, like range, but
 152                 // we don't use those at the moment, so no point in adding all of them.
 153                 'email' => 'HTMLTextField',
 154                 'password' => 'HTMLTextField',
 155                 'url' => 'HTMLTextField',
 156                 'title' => 'HTMLTitleTextField',
 157                 'user' => 'HTMLUserTextField',
 158         );
 159
 160         public $mFieldData;
 161
 162         protected $mMessagePrefix;
 163
 164         /** @var HTMLFormField[] */
 165         protected $mFlatFields;
 166
 167         protected $mFieldTree;
 168         protected $mShowReset = false;
 169         protected $mShowSubmit = true;
 170         protected $mSubmitFlags = array( 'constructive', 'primary' );
 171
 172         protected $mSubmitCallback;
 173         protected $mValidationErrorMessage;
 174
 175         protected $mPre = '';
 176         protected $mHeader = '';
 177         protected $mFooter = '';
 178         protected $mSectionHeaders = array();
 179         protected $mSectionFooters = array();
 180         protected $mPost = '';
 181         protected $mId;
 182         protected $mTableId = '';
 183
 184         protected $mSubmitID;
 185         protected $mSubmitName;
 186         protected $mSubmitText;
 187         protected $mSubmitTooltip;
 188
 189         protected $mTitle;
 190         protected $mMethod = 'post';
 191         protected $mWasSubmitted = false;
 192
 193         /**
 194          * Form action URL. false means we will use the URL to set Title
 195          * @since 1.19
 196          * @var bool|string
 197          */
 198         protected $mAction = false;
 199
 200         protected $mUseMultipart = false;
 201         protected $mHiddenFields = array();
 202         protected $mButtons = array();
 203
 204         protected $mWrapperLegend = false;
 205
 206         /**
 207          * Salt for the edit token.
 208          * @var string|array
 209          */
 210         protected $mTokenSalt = '';
 211
 212         /**
 213          * If true, sections that contain both fields and subsections will
 214          * render their subsections before their fields.
 215          *
 216          * Subclasses may set this to false to render subsections after fields
 217          * instead.
 218          */
 219         protected $mSubSectionBeforeFields = true;
 220
 221         /**
 222          * Format in which to display form. For viable options,
 223          * @see $availableDisplayFormats
 224          * @var string
 225          */
 226         protected $displayFormat = 'table';
 227
 228         /**
 229          * Available formats in which to display the form
 230          * @var array
 231          */
 232         protected $availableDisplayFormats = array(
 233                 'table',
 234                 'div',
 235                 'raw',
 236                 'inline',
 237         );
 238
 239         /**
 240          * Available formats in which to display the form
 241          * @var array
 242          */
 243         protected $availableSubclassDisplayFormats = array(
 244                 'vform',
 245                 'ooui',
 246         );
 247
 248         /**
 249          * Construct a HTMLForm object for given display type. May return a HTMLForm subclass.
 250          *
 251          * @param string $displayFormat
 252          * @param mixed $arguments... Additional arguments to pass to the constructor.
 253          * @return HTMLForm
 254          */
 255         public static function factory( $displayFormat/*, $arguments...*/ ) {
 256                 $arguments = func_get_args();
 257                 array_shift( $arguments );
 258
 259                 switch ( $displayFormat ) {
 260                         case 'vform':
 261                                 $reflector = new ReflectionClass( 'VFormHTMLForm' );
 262                                 return $reflector->newInstanceArgs( $arguments );
 263                         case 'ooui':
 264                                 $reflector = new ReflectionClass( 'OOUIHTMLForm' );
 265                                 return $reflector->newInstanceArgs( $arguments );
 266                         default:
 267                                 $reflector = new ReflectionClass( 'HTMLForm' );
 268                                 $form = $reflector->newInstanceArgs( $arguments );
 269                                 $form->setDisplayFormat( $displayFormat );
 270                                 return $form;
 271                 }
 272         }
 273
 274         /**
 275          * Build a new HTMLForm from an array of field attributes
 276          *
 277          * @param array $descriptor Array of Field constructs, as described above
 278          * @param IContextSource $context Available since 1.18, will become compulsory in 1.18.
 279          *     Obviates the need to call $form->setTitle()
 280          * @param string $messagePrefix A prefix to go in front of default messages
 281          */
 282         public function __construct( $descriptor, /*IContextSource*/ $context = null,
 283                 $messagePrefix = ''
 284         ) {
 285                 if ( $context instanceof IContextSource ) {
 286                         $this->setContext( $context );
 287                         $this->mTitle = false; // We don't need them to set a title
 288                         $this->mMessagePrefix = $messagePrefix;
 289                 } elseif ( is_null( $context ) && $messagePrefix !== '' ) {
 290                         $this->mMessagePrefix = $messagePrefix;
 291                 } elseif ( is_string( $context ) && $messagePrefix === '' ) {
 292                         // B/C since 1.18
 293                         // it's actually $messagePrefix
 294                         $this->mMessagePrefix = $context;
 295                 }
 296
 297                 // Evil hack for mobile :(
 298                 if (
 299                         !$this->getConfig()->get( 'HTMLFormAllowTableFormat' )
 300                         && $this->displayFormat === 'table'
 301                 ) {
 302                         $this->displayFormat = 'div';
 303                 }
 304
 305                 // Expand out into a tree.
 306                 $loadedDescriptor = array();
 307                 $this->mFlatFields = array();
 308
 309                 foreach ( $descriptor as $fieldname => $info ) {
 310                         $section = isset( $info['section'] )
 311                                 ? $info['section']
 312                                 : '';
 313
 314                         if ( isset( $info['type'] ) && $info['type'] == 'file' ) {
 315                                 $this->mUseMultipart = true;
 316                         }
 317
 318                         $field = static::loadInputFromParameters( $fieldname, $info, $this );
 319
 320                         $setSection =& $loadedDescriptor;
 321                         if ( $section ) {
 322                                 $sectionParts = explode( '/', $section );
 323
 324                                 while ( count( $sectionParts ) ) {
 325                                         $newName = array_shift( $sectionParts );
 326
 327                                         if ( !isset( $setSection[$newName] ) ) {
 328                                                 $setSection[$newName] = array();
 329                                         }
 330
 331                                         $setSection =& $setSection[$newName];
 332                                 }
 333                         }
 334
 335                         $setSection[$fieldname] = $field;
 336                         $this->mFlatFields[$fieldname] = $field;
 337                 }
 338
 339                 $this->mFieldTree = $loadedDescriptor;
 340         }
 341
 342         /**
 343          * Set format in which to display the form
 344          *
 345          * @param string $format The name of the format to use, must be one of
 346          *   $this->availableDisplayFormats
 347          *
 348          * @throws MWException
 349          * @since 1.20
 350          * @return HTMLForm $this for chaining calls (since 1.20)
 351          */
 352         public function setDisplayFormat( $format ) {
 353                 if (
 354                         in_array( $format, $this->availableSubclassDisplayFormats ) ||
 355                         in_array( $this->displayFormat, $this->availableSubclassDisplayFormats )
 356                 ) {
 357                         throw new MWException( 'Cannot change display format after creation, ' .
 358                                 'use HTMLForm::factory() instead' );
 359                 }
 360
 361                 if ( !in_array( $format, $this->availableDisplayFormats ) ) {
 362                         throw new MWException( 'Display format must be one of ' .
 363                                 print_r( $this->availableDisplayFormats, true ) );
 364                 }
 365
 366                 // Evil hack for mobile :(
 367                 if ( !$this->getConfig()->get( 'HTMLFormAllowTableFormat' ) && $format === 'table' ) {
 368                         $format = 'div';
 369                 }
 370
 371                 $this->displayFormat = $format;
 372
 373                 return $this;
 374         }
 375
 376         /**
 377          * Getter for displayFormat
 378          * @since 1.20
 379          * @return string
 380          */
 381         public function getDisplayFormat() {
 382                 return $this->displayFormat;
 383         }
 384
 385         /**
 386          * Test if displayFormat is 'vform'
 387          * @since 1.22
 388          * @deprecated since 1.25
 389          * @return bool
 390          */
 391         public function isVForm() {
 392                 wfDeprecated( __METHOD__, '1.25' );
 393                 return false;
 394         }
 395
 396         /**
 397          * Get the HTMLFormField subclass for this descriptor.
 398          *
 399          * The descriptor can be passed either 'class' which is the name of
 400          * a HTMLFormField subclass, or a shorter 'type' which is an alias.
 401          * This makes sure the 'class' is always set, and also is returned by
 402          * this function for ease.
 403          *
 404          * @since 1.23
 405          *
 406          * @param string $fieldname Name of the field
 407          * @param array $descriptor Input Descriptor, as described above
 408          *
 409          * @throws MWException
 410          * @return string Name of a HTMLFormField subclass
 411          */
 412         public static function getClassFromDescriptor( $fieldname, &$descriptor ) {
 413                 if ( isset( $descriptor['class'] ) ) {
 414                         $class = $descriptor['class'];
 415                 } elseif ( isset( $descriptor['type'] ) ) {
 416                         $class = static::$typeMappings[$descriptor['type']];
 417                         $descriptor['class'] = $class;
 418                 } else {
 419                         $class = null;
 420                 }
 421
 422                 if ( !$class ) {
 423                         throw new MWException( "Descriptor with no class for $fieldname: "
 424                                 . print_r( $descriptor, true ) );
 425                 }
 426
 427                 return $class;
 428         }
 429
 430         /**
 431          * Initialise a new Object for the field
 432          *
 433          * @param string $fieldname Name of the field
 434          * @param array $descriptor Input Descriptor, as described above
 435          * @param HTMLForm|null $parent Parent instance of HTMLForm
 436          *
 437          * @throws MWException
 438          * @return HTMLFormField Instance of a subclass of HTMLFormField
 439          */
 440         public static function loadInputFromParameters( $fieldname, $descriptor,
 441                 HTMLForm $parent = null
 442         ) {
 443                 $class = static::getClassFromDescriptor( $fieldname, $descriptor );
 444
 445                 $descriptor['fieldname'] = $fieldname;
 446                 if ( $parent ) {
 447                         $descriptor['parent'] = $parent;
 448                 }
 449
 450                 # @todo This will throw a fatal error whenever someone try to use
 451                 # 'class' to feed a CSS class instead of 'cssclass'. Would be
 452                 # great to avoid the fatal error and show a nice error.
 453                 $obj = new $class( $descriptor );
 454
 455                 return $obj;
 456         }
 457
 458         /**
 459          * Prepare form for submission.
 460          *
 461          * @attention When doing method chaining, that should be the very last
 462          * method call before displayForm().
 463          *
 464          * @throws MWException
 465          * @return HTMLForm $this for chaining calls (since 1.20)
 466          */
 467         function prepareForm() {
 468                 # Check if we have the info we need
 469                 if ( !$this->mTitle instanceof Title && $this->mTitle !== false ) {
 470                         throw new MWException( "You must call setTitle() on an HTMLForm" );
 471                 }
 472
 473                 # Load data from the request.
 474                 $this->loadData();
 475
 476                 return $this;
 477         }
 478
 479         /**
 480          * Try submitting, with edit token check first
 481          * @return Status|bool
 482          */
 483         function tryAuthorizedSubmit() {
 484                 $result = false;
 485
 486                 $submit = false;
 487                 if ( $this->getMethod() != 'post' ) {
 488                         $submit = true; // no session check needed
 489                 } elseif ( $this->getRequest()->wasPosted() ) {
 490                         $editToken = $this->getRequest()->getVal( 'wpEditToken' );
 491                         if ( $this->getUser()->isLoggedIn() || $editToken != null ) {
 492                                 // Session tokens for logged-out users have no security value.
 493                                 // However, if the user gave one, check it in order to give a nice
 494                                 // "session expired" error instead of "permission denied" or such.
 495                                 $submit = $this->getUser()->matchEditToken( $editToken, $this->mTokenSalt );
 496                         } else {
 497                                 $submit = true;
 498                         }
 499                 }
 500
 501                 if ( $submit ) {
 502                         $this->mWasSubmitted = true;
 503                         $result = $this->trySubmit();
 504                 }
 505
 506                 return $result;
 507         }
 508
 509         /**
 510          * The here's-one-I-made-earlier option: do the submission if
 511          * posted, or display the form with or without funky validation
 512          * errors
 513          * @return bool|Status Whether submission was successful.
 514          */
 515         function show() {
 516                 $this->prepareForm();
 517
 518                 $result = $this->tryAuthorizedSubmit();
 519                 if ( $result === true || ( $result instanceof Status && $result->isGood() ) ) {
 520                         return $result;
 521                 }
 522
 523                 $this->displayForm( $result );
 524
 525                 return false;
 526         }
 527
 528         /**
 529          * Validate all the fields, and call the submission callback
 530          * function if everything is kosher.
 531          * @throws MWException
 532          * @return bool|string|array|Status
 533          *     - Bool true or a good Status object indicates success,
 534          *     - Bool false indicates no submission was attempted,
 535          *     - Anything else indicates failure. The value may be a fatal Status
 536          *       object, an HTML string, or an array of arrays (message keys and
 537          *       params) or strings (message keys)
 538          */
 539         function trySubmit() {
 540                 $this->mWasSubmitted = true;
 541
 542                 # Check for cancelled submission
 543                 foreach ( $this->mFlatFields as $fieldname => $field ) {
 544                         if ( !empty( $field->mParams['nodata'] ) ) {
 545                                 continue;
 546                         }
 547                         if ( $field->cancelSubmit( $this->mFieldData[$fieldname], $this->mFieldData ) ) {
 548                                 $this->mWasSubmitted = false;
 549                                 return false;
 550                         }
 551                 }
 552
 553                 # Check for validation
 554                 foreach ( $this->mFlatFields as $fieldname => $field ) {
 555                         if ( !empty( $field->mParams['nodata'] ) ) {
 556                                 continue;
 557                         }
 558                         if ( $field->isHidden( $this->mFieldData ) ) {
 559                                 continue;
 560                         }
 561                         if ( $field->validate(
 562                                         $this->mFieldData[$fieldname],
 563                                         $this->mFieldData )
 564                                 !== true
 565                         ) {
 566                                 return isset( $this->mValidationErrorMessage )
 567                                         ? $this->mValidationErrorMessage
 568                                         : array( 'htmlform-invalid-input' );
 569                         }
 570                 }
 571
 572                 $callback = $this->mSubmitCallback;
 573                 if ( !is_callable( $callback ) ) {
 574                         throw new MWException( 'HTMLForm: no submit callback provided. Use ' .
 575                                 'setSubmitCallback() to set one.' );
 576                 }
 577
 578                 $data = $this->filterDataForSubmit( $this->mFieldData );
 579
 580                 $res = call_user_func( $callback, $data, $this );
 581                 if ( $res === false ) {
 582                         $this->mWasSubmitted = false;
 583                 }
 584
 585                 return $res;
 586         }
 587
 588         /**
 589          * Test whether the form was considered to have been submitted or not, i.e.
 590          * whether the last call to tryAuthorizedSubmit or trySubmit returned
 591          * non-false.
 592          *
 593          * This will return false until HTMLForm::tryAuthorizedSubmit or
 594          * HTMLForm::trySubmit is called.
 595          *
 596          * @since 1.23
 597          * @return bool
 598          */
 599         function wasSubmitted() {
 600                 return $this->mWasSubmitted;
 601         }
 602
 603         /**
 604          * Set a callback to a function to do something with the form
 605          * once it's been successfully validated.
 606          *
 607          * @param callable $cb The function will be passed the output from
 608          *   HTMLForm::filterDataForSubmit and this HTMLForm object, and must
 609          *   return as documented for HTMLForm::trySubmit
 610          *
 611          * @return HTMLForm $this for chaining calls (since 1.20)
 612          */
 613         function setSubmitCallback( $cb ) {
 614                 $this->mSubmitCallback = $cb;
 615
 616                 return $this;
 617         }
 618
 619         /**
 620          * Set a message to display on a validation error.
 621          *
 622          * @param string|array $msg String or Array of valid inputs to wfMessage()
 623          *     (so each entry can be either a String or Array)
 624          *
 625          * @return HTMLForm $this for chaining calls (since 1.20)
 626          */
 627         function setValidationErrorMessage( $msg ) {
 628                 $this->mValidationErrorMessage = $msg;
 629
 630                 return $this;
 631         }
 632
 633         /**
 634          * Set the introductory message, overwriting any existing message.
 635          *
 636          * @param string $msg Complete text of message to display
 637          *
 638          * @return HTMLForm $this for chaining calls (since 1.20)
 639          */
 640         function setIntro( $msg ) {
 641                 $this->setPreText( $msg );
 642
 643                 return $this;
 644         }
 645
 646         /**
 647          * Set the introductory message, overwriting any existing message.
 648          * @since 1.19
 649          *
 650          * @param string $msg Complete text of message to display
 651          *
 652          * @return HTMLForm $this for chaining calls (since 1.20)
 653          */
 654         function setPreText( $msg ) {
 655                 $this->mPre = $msg;
 656
 657                 return $this;
 658         }
 659
 660         /**
 661          * Add introductory text.
 662          *
 663          * @param string $msg Complete text of message to display
 664          *
 665          * @return HTMLForm $this for chaining calls (since 1.20)
 666          */
 667         function addPreText( $msg ) {
 668                 $this->mPre .= $msg;
 669
 670                 return $this;
 671         }
 672
 673         /**
 674          * Add header text, inside the form.
 675          *
 676          * @param string $msg Complete text of message to display
 677          * @param string|null $section The section to add the header to
 678          *
 679          * @return HTMLForm $this for chaining calls (since 1.20)
 680          */
 681         function addHeaderText( $msg, $section = null ) {
 682                 if ( is_null( $section ) ) {
 683                         $this->mHeader .= $msg;
 684                 } else {
 685                         if ( !isset( $this->mSectionHeaders[$section] ) ) {
 686                                 $this->mSectionHeaders[$section] = '';
 687                         }
 688                         $this->mSectionHeaders[$section] .= $msg;
 689                 }
 690
 691                 return $this;
 692         }
 693
 694         /**
 695          * Set header text, inside the form.
 696          * @since 1.19
 697          *
 698          * @param string $msg Complete text of message to display
 699          * @param string|null $section The section to add the header to
 700          *
 701          * @return HTMLForm $this for chaining calls (since 1.20)
 702          */
 703         function setHeaderText( $msg, $section = null ) {
 704                 if ( is_null( $section ) ) {
 705                         $this->mHeader = $msg;
 706                 } else {
 707                         $this->mSectionHeaders[$section] = $msg;
 708                 }
 709
 710                 return $this;
 711         }
 712
 713         /**
 714          * Add footer text, inside the form.
 715          *
 716          * @param string $msg Complete text of message to display
 717          * @param string|null $section The section to add the footer text to
 718          *
 719          * @return HTMLForm $this for chaining calls (since 1.20)
 720          */
 721         function addFooterText( $msg, $section = null ) {
 722                 if ( is_null( $section ) ) {
 723                         $this->mFooter .= $msg;
 724                 } else {
 725                         if ( !isset( $this->mSectionFooters[$section] ) ) {
 726                                 $this->mSectionFooters[$section] = '';
 727                         }
 728                         $this->mSectionFooters[$section] .= $msg;
 729                 }
 730
 731                 return $this;
 732         }
 733
 734         /**
 735          * Set footer text, inside the form.
 736          * @since 1.19
 737          *
 738          * @param string $msg Complete text of message to display
 739          * @param string|null $section The section to add the footer text to
 740          *
 741          * @return HTMLForm $this for chaining calls (since 1.20)
 742          */
 743         function setFooterText( $msg, $section = null ) {
 744                 if ( is_null( $section ) ) {
 745                         $this->mFooter = $msg;
 746                 } else {
 747                         $this->mSectionFooters[$section] = $msg;
 748                 }
 749
 750                 return $this;
 751         }
 752
 753         /**
 754          * Add text to the end of the display.
 755          *
 756          * @param string $msg Complete text of message to display
 757          *
 758          * @return HTMLForm $this for chaining calls (since 1.20)
 759          */
 760         function addPostText( $msg ) {
 761                 $this->mPost .= $msg;
 762
 763                 return $this;
 764         }
 765
 766         /**
 767          * Set text at the end of the display.
 768          *
 769          * @param string $msg Complete text of message to display
 770          *
 771          * @return HTMLForm $this for chaining calls (since 1.20)
 772          */
 773         function setPostText( $msg ) {
 774                 $this->mPost = $msg;
 775
 776                 return $this;
 777         }
 778
 779         /**
 780          * Add a hidden field to the output
 781          *
 782          * @param string $name Field name.  This will be used exactly as entered
 783          * @param string $value Field value
 784          * @param array $attribs
 785          *
 786          * @return HTMLForm $this for chaining calls (since 1.20)
 787          */
 788         public function addHiddenField( $name, $value, $attribs = array() ) {
 789                 $attribs += array( 'name' => $name );
 790                 $this->mHiddenFields[] = array( $value, $attribs );
 791
 792                 return $this;
 793         }
 794
 795         /**
 796          * Add an array of hidden fields to the output
 797          *
 798          * @since 1.22
 799          *
 800          * @param array $fields Associative array of fields to add;
 801          *        mapping names to their values
 802          *
 803          * @return HTMLForm $this for chaining calls
 804          */
 805         public function addHiddenFields( array $fields ) {
 806                 foreach ( $fields as $name => $value ) {
 807                         $this->mHiddenFields[] = array( $value, array( 'name' => $name ) );
 808                 }
 809
 810                 return $this;
 811         }
 812
 813         /**
 814          * Add a button to the form
 815          *
 816          * @param string $name Field name.
 817          * @param string $value Field value
 818          * @param string $id DOM id for the button (default: null)
 819          * @param array $attribs
 820          *
 821          * @return HTMLForm $this for chaining calls (since 1.20)
 822          */
 823         public function addButton( $name, $value, $id = null, $attribs = null ) {
 824                 $this->mButtons[] = compact( 'name', 'value', 'id', 'attribs' );
 825
 826                 return $this;
 827         }
 828
 829         /**
 830          * Set the salt for the edit token.
 831          *
 832          * Only useful when the method is "post".
 833          *
 834          * @since 1.24
 835          * @param string|array $salt Salt to use
 836          * @return HTMLForm $this For chaining calls
 837          */
 838         public function setTokenSalt( $salt ) {
 839                 $this->mTokenSalt = $salt;
 840
 841                 return $this;
 842         }
 843
 844         /**
 845          * Display the form (sending to the context's OutputPage object), with an
 846          * appropriate error message or stack of messages, and any validation errors, etc.
 847          *
 848          * @attention You should call prepareForm() before calling this function.
 849          * Moreover, when doing method chaining this should be the very last method
 850          * call just after prepareForm().
 851          *
 852          * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
 853          *
 854          * @return void Nothing, should be last call
 855          */
 856         function displayForm( $submitResult ) {
 857                 $this->getOutput()->addHTML( $this->getHTML( $submitResult ) );
 858         }
 859
 860         /**
 861          * Returns the raw HTML generated by the form
 862          *
 863          * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
 864          *
 865          * @return string
 866          */
 867         function getHTML( $submitResult ) {
 868                 # For good measure (it is the default)
 869                 $this->getOutput()->preventClickjacking();
 870                 $this->getOutput()->addModules( 'mediawiki.htmlform' );
 871
 872                 $html = ''
 873                         . $this->getErrors( $submitResult )
 874                         // In OOUI forms, we handle mHeader elsewhere. FIXME This is horrible.
 875                         . ( $this->getDisplayFormat() === 'ooui' ? '' : $this->mHeader )
 876                         . $this->getBody()
 877                         . $this->getHiddenFields()
 878                         . $this->getButtons()
 879                         . $this->mFooter;
 880
 881                 $html = $this->wrapForm( $html );
 882
 883                 return '' . $this->mPre . $html . $this->mPost;
 884         }
 885
 886         /**
 887          * Get HTML attributes for the `<form>` tag.
 888          * @return array
 889          */
 890         protected function getFormAttributes() {
 891                 # Use multipart/form-data
 892                 $encType = $this->mUseMultipart
 893                         ? 'multipart/form-data'
 894                         : 'application/x-www-form-urlencoded';
 895                 # Attributes
 896                 $attribs = array(
 897                         'action' => $this->getAction(),
 898                         'method' => $this->getMethod(),
 899                         'enctype' => $encType,
 900                 );
 901                 if ( !empty( $this->mId ) ) {
 902                         $attribs['id'] = $this->mId;
 903                 }
 904                 return $attribs;
 905         }
 906
 907         /**
 908          * Wrap the form innards in an actual "<form>" element
 909          *
 910          * @param string $html HTML contents to wrap.
 911          *
 912          * @return string Wrapped HTML.
 913          */
 914         function wrapForm( $html ) {
 915                 # Include a <fieldset> wrapper for style, if requested.
 916                 if ( $this->mWrapperLegend !== false ) {
 917                         $legend = is_string( $this->mWrapperLegend ) ? $this->mWrapperLegend : false;
 918                         $html = Xml::fieldset( $legend, $html );
 919                 }
 920
 921                 return Html::rawElement( 'form', $this->getFormAttributes() + array( 'class' => 'visualClear' ), $html );
 922         }
 923
 924         /**
 925          * Get the hidden fields that should go inside the form.
 926          * @return string HTML.
 927          */
 928         function getHiddenFields() {
 929                 $html = '';
 930                 if ( $this->getMethod() == 'post' ) {
 931                         $html .= Html::hidden(
 932                                 'wpEditToken',
 933                                 $this->getUser()->getEditToken( $this->mTokenSalt ),
 934                                 array( 'id' => 'wpEditToken' )
 935                         ) . "\n";
 936                         $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
 937                 }
 938
 939                 $articlePath = $this->getConfig()->get( 'ArticlePath' );
 940                 if ( strpos( $articlePath, '?' ) !== false && $this->getMethod() == 'get' ) {
 941                         $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
 942                 }
 943
 944                 foreach ( $this->mHiddenFields as $data ) {
 945                         list( $value, $attribs ) = $data;
 946                         $html .= Html::hidden( $attribs['name'], $value, $attribs ) . "\n";
 947                 }
 948
 949                 return $html;
 950         }
 951
 952         /**
 953          * Get the submit and (potentially) reset buttons.
 954          * @return string HTML.
 955          */
 956         function getButtons() {
 957                 $buttons = '';
 958                 $useMediaWikiUIEverywhere = $this->getConfig()->get( 'UseMediaWikiUIEverywhere' );
 959
 960                 if ( $this->mShowSubmit ) {
 961                         $attribs = array();
 962
 963                         if ( isset( $this->mSubmitID ) ) {
 964                                 $attribs['id'] = $this->mSubmitID;
 965                         }
 966
 967                         if ( isset( $this->mSubmitName ) ) {
 968                                 $attribs['name'] = $this->mSubmitName;
 969                         }
 970
 971                         if ( isset( $this->mSubmitTooltip ) ) {
 972                                 $attribs += Linker::tooltipAndAccesskeyAttribs( $this->mSubmitTooltip );
 973                         }
 974
 975                         $attribs['class'] = array( 'mw-htmlform-submit' );
 976
 977                         if ( $useMediaWikiUIEverywhere ) {
 978                                 foreach ( $this->mSubmitFlags as $flag ) {
 979                                         array_push( $attribs['class'], 'mw-ui-' . $flag );
 980                                 }
 981                                 array_push( $attribs['class'], 'mw-ui-button' );
 982                         }
 983
 984                         $buttons .= Xml::submitButton( $this->getSubmitText(), $attribs ) . "\n";
 985                 }
 986
 987                 if ( $this->mShowReset ) {
 988                         $buttons .= Html::element(
 989                                 'input',
 990                                 array(
 991                                         'type' => 'reset',
 992                                         'value' => $this->msg( 'htmlform-reset' )->text(),
 993                                         'class' => ( $useMediaWikiUIEverywhere ? 'mw-ui-button' : null ),
 994                                 )
 995                         ) . "\n";
 996                 }
 997
 998                 foreach ( $this->mButtons as $button ) {
 999                         $attrs = array(
1000                                 'type' => 'submit',
1001                                 'name' => $button['name'],
1002                                 'value' => $button['value']
1003                         );
1004
1005                         if ( $button['attribs'] ) {
1006                                 $attrs += $button['attribs'];
1007                         }
1008
1009                         if ( isset( $button['id'] ) ) {
1010                                 $attrs['id'] = $button['id'];
1011                         }
1012
1013                         if ( $useMediaWikiUIEverywhere ) {
1014                                 $attrs['class'] = isset( $attrs['class'] ) ? (array)$attrs['class'] : array();
1015                                 $attrs['class'][] = 'mw-ui-button';
1016                         }
1017
1018                         $buttons .= Html::element( 'input', $attrs ) . "\n";
1019                 }
1020
1021                 $html = Html::rawElement( 'span',
1022                         array( 'class' => 'mw-htmlform-submit-buttons' ), "\n$buttons" ) . "\n";
1023
1024                 return $html;
1025         }
1026
1027         /**
1028          * Get the whole body of the form.
1029          * @return string
1030          */
1031         function getBody() {
1032                 return $this->displaySection( $this->mFieldTree, $this->mTableId );
1033         }
1034
1035         /**
1036          * Format and display an error message stack.
1037          *
1038          * @param string|array|Status $errors
1039          *
1040          * @return string
1041          */
1042         function getErrors( $errors ) {
1043                 if ( $errors instanceof Status ) {
1044                         if ( $errors->isOK() ) {
1045                                 $errorstr = '';
1046                         } else {
1047                                 $errorstr = $this->getOutput()->parse( $errors->getWikiText() );
1048                         }
1049                 } elseif ( is_array( $errors ) ) {
1050                         $errorstr = $this->formatErrors( $errors );
1051                 } else {
1052                         $errorstr = $errors;
1053                 }
1054
1055                 return $errorstr
1056                         ? Html::rawElement( 'div', array( 'class' => 'error' ), $errorstr )
1057                         : '';
1058         }
1059
1060         /**
1061          * Format a stack of error messages into a single HTML string
1062          *
1063          * @param array $errors Array of message keys/values
1064          *
1065          * @return string HTML, a "<ul>" list of errors
1066          */
1067         public function formatErrors( $errors ) {
1068                 $errorstr = '';
1069
1070                 foreach ( $errors as $error ) {
1071                         if ( is_array( $error ) ) {
1072                                 $msg = array_shift( $error );
1073                         } else {
1074                                 $msg = $error;
1075                                 $error = array();
1076                         }
1077
1078                         $errorstr .= Html::rawElement(
1079                                 'li',
1080                                 array(),
1081                                 $this->msg( $msg, $error )->parse()
1082                         );
1083                 }
1084
1085                 $errorstr = Html::rawElement( 'ul', array(), $errorstr );
1086
1087                 return $errorstr;
1088         }
1089
1090         /**
1091          * Set the text for the submit button
1092          *
1093          * @param string $t Plaintext
1094          *
1095          * @return HTMLForm $this for chaining calls (since 1.20)
1096          */
1097         function setSubmitText( $t ) {
1098                 $this->mSubmitText = $t;
1099
1100                 return $this;
1101         }
1102
1103         /**
1104          * Identify that the submit button in the form has a destructive action
1105          * @since 1.24
1106          */
1107         public function setSubmitDestructive() {
1108                 $this->mSubmitFlags = array( 'destructive', 'primary' );
1109         }
1110
1111         /**
1112          * Identify that the submit button in the form has a progressive action
1113          * @since 1.25
1114          */
1115         public function setSubmitProgressive() {
1116                 $this->mSubmitFlags = array( 'progressive', 'primary' );
1117         }
1118
1119         /**
1120          * Set the text for the submit button to a message
1121          * @since 1.19
1122          *
1123          * @param string|Message $msg Message key or Message object
1124          *
1125          * @return HTMLForm $this for chaining calls (since 1.20)
1126          */
1127         public function setSubmitTextMsg( $msg ) {
1128                 if ( !$msg instanceof Message ) {
1129                         $msg = $this->msg( $msg );
1130                 }
1131                 $this->setSubmitText( $msg->text() );
1132
1133                 return $this;
1134         }
1135
1136         /**
1137          * Get the text for the submit button, either customised or a default.
1138          * @return string
1139          */
1140         function getSubmitText() {
1141                 return $this->mSubmitText
1142                         ? $this->mSubmitText
1143                         : $this->msg( 'htmlform-submit' )->text();
1144         }
1145
1146         /**
1147          * @param string $name Submit button name
1148          *
1149          * @return HTMLForm $this for chaining calls (since 1.20)
1150          */
1151         public function setSubmitName( $name ) {
1152                 $this->mSubmitName = $name;
1153
1154                 return $this;
1155         }
1156
1157         /**
1158          * @param string $name Tooltip for the submit button
1159          *
1160          * @return HTMLForm $this for chaining calls (since 1.20)
1161          */
1162         public function setSubmitTooltip( $name ) {
1163                 $this->mSubmitTooltip = $name;
1164
1165                 return $this;
1166         }
1167
1168         /**
1169          * Set the id for the submit button.
1170          *
1171          * @param string $t
1172          *
1173          * @todo FIXME: Integrity of $t is *not* validated
1174          * @return HTMLForm $this for chaining calls (since 1.20)
1175          */
1176         function setSubmitID( $t ) {
1177                 $this->mSubmitID = $t;
1178
1179                 return $this;
1180         }
1181
1182         /**
1183          * Stop a default submit button being shown for this form. This implies that an
1184          * alternate submit method must be provided manually.
1185          *
1186          * @since 1.22
1187          *
1188          * @param bool $suppressSubmit Set to false to re-enable the button again
1189          *
1190          * @return HTMLForm $this for chaining calls
1191          */
1192         function suppressDefaultSubmit( $suppressSubmit = true ) {
1193                 $this->mShowSubmit = !$suppressSubmit;
1194
1195                 return $this;
1196         }
1197
1198         /**
1199          * Set the id of the \<table\> or outermost \<div\> element.
1200          *
1201          * @since 1.22
1202          *
1203          * @param string $id New value of the id attribute, or "" to remove
1204          *
1205          * @return HTMLForm $this for chaining calls
1206          */
1207         public function setTableId( $id ) {
1208                 $this->mTableId = $id;
1209
1210                 return $this;
1211         }
1212
1213         /**
1214          * @param string $id DOM id for the form
1215          *
1216          * @return HTMLForm $this for chaining calls (since 1.20)
1217          */
1218         public function setId( $id ) {
1219                 $this->mId = $id;
1220
1221                 return $this;
1222         }
1223
1224         /**
1225          * Prompt the whole form to be wrapped in a "<fieldset>", with
1226          * this text as its "<legend>" element.
1227          *
1228          * @param string|bool $legend If false, no wrapper or legend will be displayed.
1229          *     If true, a wrapper will be displayed, but no legend.
1230          *     If a string, a wrapper will be displayed with that string as a legend.
1231          *     The string will be escaped before being output (this doesn't support HTML).
1232          *
1233          * @return HTMLForm $this for chaining calls (since 1.20)
1234          */
1235         public function setWrapperLegend( $legend ) {
1236                 $this->mWrapperLegend = $legend;
1237
1238                 return $this;
1239         }
1240
1241         /**
1242          * Prompt the whole form to be wrapped in a "<fieldset>", with
1243          * this message as its "<legend>" element.
1244          * @since 1.19
1245          *
1246          * @param string|Message $msg Message key or Message object
1247          *
1248          * @return HTMLForm $this for chaining calls (since 1.20)
1249          */
1250         public function setWrapperLegendMsg( $msg ) {
1251                 if ( !$msg instanceof Message ) {
1252                         $msg = $this->msg( $msg );
1253                 }
1254                 $this->setWrapperLegend( $msg->text() );
1255
1256                 return $this;
1257         }
1258
1259         /**
1260          * Set the prefix for various default messages
1261          * @todo Currently only used for the "<fieldset>" legend on forms
1262          * with multiple sections; should be used elsewhere?
1263          *
1264          * @param string $p
1265          *
1266          * @return HTMLForm $this for chaining calls (since 1.20)
1267          */
1268         function setMessagePrefix( $p ) {
1269                 $this->mMessagePrefix = $p;
1270
1271                 return $this;
1272         }
1273
1274         /**
1275          * Set the title for form submission
1276          *
1277          * @param Title $t Title of page the form is on/should be posted to
1278          *
1279          * @return HTMLForm $this for chaining calls (since 1.20)
1280          */
1281         function setTitle( $t ) {
1282                 $this->mTitle = $t;
1283
1284                 return $this;
1285         }
1286
1287         /**
1288          * Get the title
1289          * @return Title
1290          */
1291         function getTitle() {
1292                 return $this->mTitle === false
1293                         ? $this->getContext()->getTitle()
1294                         : $this->mTitle;
1295         }
1296
1297         /**
1298          * Set the method used to submit the form
1299          *
1300          * @param string $method
1301          *
1302          * @return HTMLForm $this for chaining calls (since 1.20)
1303          */
1304         public function setMethod( $method = 'post' ) {
1305                 $this->mMethod = strtolower( $method );
1306
1307                 return $this;
1308         }
1309
1310         /**
1311          * @return string Always lowercase
1312          */
1313         public function getMethod() {
1314                 return $this->mMethod;
1315         }
1316
1317         /**
1318          * @todo Document
1319          *
1320          * @param array[]|HTMLFormField[] $fields Array of fields (either arrays or
1321          *   objects).
1322          * @param string $sectionName ID attribute of the "<table>" tag for this
1323          *   section, ignored if empty.
1324          * @param string $fieldsetIDPrefix ID prefix for the "<fieldset>" tag of
1325          *   each subsection, ignored if empty.
1326          * @param bool &$hasUserVisibleFields Whether the section had user-visible fields.
1327          *
1328          * @return string
1329          */
1330         public function displaySection( $fields,
1331                 $sectionName = '',
1332                 $fieldsetIDPrefix = '',
1333                 &$hasUserVisibleFields = false ) {
1334                 $displayFormat = $this->getDisplayFormat();
1335
1336                 $html = '';
1337                 $subsectionHtml = '';
1338                 $hasLabel = false;
1339
1340                 // Conveniently, PHP method names are case-insensitive.
1341                 $getFieldHtmlMethod = $displayFormat == 'table' ? 'getTableRow' : ( 'get' . $displayFormat );
1342
1343                 foreach ( $fields as $key => $value ) {
1344                         if ( $value instanceof HTMLFormField ) {
1345                                 $v = empty( $value->mParams['nodata'] )
1346                                         ? $this->mFieldData[$key]
1347                                         : $value->getDefault();
1348                                 $html .= $value->$getFieldHtmlMethod( $v );
1349
1350                                 $labelValue = trim( $value->getLabel() );
1351                                 if ( $labelValue != '&#160;' && $labelValue !== '' ) {
1352                                         $hasLabel = true;
1353                                 }
1354
1355                                 if ( get_class( $value ) !== 'HTMLHiddenField' &&
1356                                         get_class( $value ) !== 'HTMLApiField'
1357                                 ) {
1358                                         $hasUserVisibleFields = true;
1359                                 }
1360                         } elseif ( is_array( $value ) ) {
1361                                 $subsectionHasVisibleFields = false;
1362                                 $section =
1363                                         $this->displaySection( $value,
1364                                                 "mw-htmlform-$key",
1365                                                 "$fieldsetIDPrefix$key-",
1366                                                 $subsectionHasVisibleFields );
1367                                 $legend = null;
1368
1369                                 if ( $subsectionHasVisibleFields === true ) {
1370                                         // Display the section with various niceties.
1371                                         $hasUserVisibleFields = true;
1372
1373                                         $legend = $this->getLegend( $key );
1374
1375                                         if ( isset( $this->mSectionHeaders[$key] ) ) {
1376                                                 $section = $this->mSectionHeaders[$key] . $section;
1377                                         }
1378                                         if ( isset( $this->mSectionFooters[$key] ) ) {
1379                                                 $section .= $this->mSectionFooters[$key];
1380                                         }
1381
1382                                         $attributes = array();
1383                                         if ( $fieldsetIDPrefix ) {
1384                                                 $attributes['id'] = Sanitizer::escapeId( "$fieldsetIDPrefix$key" );
1385                                         }
1386                                         $subsectionHtml .= Xml::fieldset( $legend, $section, $attributes ) . "\n";
1387                                 } else {
1388                                         // Just return the inputs, nothing fancy.
1389                                         $subsectionHtml .= $section;
1390                                 }
1391                         }
1392                 }
1393
1394                 if ( $displayFormat !== 'raw' ) {
1395                         $classes = array();
1396
1397                         if ( !$hasLabel ) { // Avoid strange spacing when no labels exist
1398                                 $classes[] = 'mw-htmlform-nolabel';
1399                         }
1400
1401                         $attribs = array(
1402                                 'class' => implode( ' ', $classes ),
1403                         );
1404
1405                         if ( $sectionName ) {
1406                                 $attribs['id'] = Sanitizer::escapeId( $sectionName );
1407                         }
1408
1409                         if ( $displayFormat === 'table' ) {
1410                                 $html = Html::rawElement( 'table',
1411                                                 $attribs,
1412                                                 Html::rawElement( 'tbody', array(), "\n$html\n" ) ) . "\n";
1413                         } elseif ( $displayFormat === 'inline' ) {
1414                                 $html = Html::rawElement( 'span', $attribs, "\n$html\n" );
1415                         } elseif ( $displayFormat === 'ooui' ) {
1416                                 $config = array(
1417                                         'classes' => $classes,
1418                                 );
1419                                 if ( $sectionName ) {
1420                                         $config['id'] = Sanitizer::escapeId( $sectionName );
1421                                 }
1422                                 if ( is_string( $this->mWrapperLegend ) ) {
1423                                         $config['label'] = $this->mWrapperLegend;
1424                                 }
1425                                 $fieldset = new OOUI\FieldsetLayout( $config );
1426                                 // Ewww. We should pass this as $config['items'], but there might be string snippets.
1427                                 $fieldset->group->appendContent( new OOUI\HtmlSnippet( $html ) );
1428                                 $html = $fieldset;
1429                         } else {
1430                                 $html = Html::rawElement( 'div', $attribs, "\n$html\n" );
1431                         }
1432                 }
1433
1434                 if ( $subsectionHtml ) {
1435                         if ( $this->mSubSectionBeforeFields ) {
1436                                 return $subsectionHtml . "\n" . $html;
1437                         } else {
1438                                 return $html . "\n" . $subsectionHtml;
1439                         }
1440                 } else {
1441                         return $html;
1442                 }
1443         }
1444
1445         /**
1446          * Construct the form fields from the Descriptor array
1447          */
1448         function loadData() {
1449                 $fieldData = array();
1450
1451                 foreach ( $this->mFlatFields as $fieldname => $field ) {
1452                         if ( !empty( $field->mParams['nodata'] ) ) {
1453                                 continue;
1454                         } elseif ( !empty( $field->mParams['disabled'] ) ) {
1455                                 $fieldData[$fieldname] = $field->getDefault();
1456                         } else {
1457                                 $fieldData[$fieldname] = $field->loadDataFromRequest( $this->getRequest() );
1458                         }
1459                 }
1460
1461                 # Filter data.
1462                 foreach ( $fieldData as $name => &$value ) {
1463                         $field = $this->mFlatFields[$name];
1464                         $value = $field->filter( $value, $this->mFlatFields );
1465                 }
1466
1467                 $this->mFieldData = $fieldData;
1468         }
1469
1470         /**
1471          * Stop a reset button being shown for this form
1472          *
1473          * @param bool $suppressReset Set to false to re-enable the button again
1474          *
1475          * @return HTMLForm $this for chaining calls (since 1.20)
1476          */
1477         function suppressReset( $suppressReset = true ) {
1478                 $this->mShowReset = !$suppressReset;
1479
1480                 return $this;
1481         }
1482
1483         /**
1484          * Overload this if you want to apply special filtration routines
1485          * to the form as a whole, after it's submitted but before it's
1486          * processed.
1487          *
1488          * @param array $data
1489          *
1490          * @return array
1491          */
1492         function filterDataForSubmit( $data ) {
1493                 return $data;
1494         }
1495
1496         /**
1497          * Get a string to go in the "<legend>" of a section fieldset.
1498          * Override this if you want something more complicated.
1499          *
1500          * @param string $key
1501          *
1502          * @return string
1503          */
1504         public function getLegend( $key ) {
1505                 return $this->msg( "{$this->mMessagePrefix}-$key" )->text();
1506         }
1507
1508         /**
1509          * Set the value for the action attribute of the form.
1510          * When set to false (which is the default state), the set title is used.
1511          *
1512          * @since 1.19
1513          *
1514          * @param string|bool $action
1515          *
1516          * @return HTMLForm $this for chaining calls (since 1.20)
1517          */
1518         public function setAction( $action ) {
1519                 $this->mAction = $action;
1520
1521                 return $this;
1522         }
1523
1524         /**
1525          * Get the value for the action attribute of the form.
1526          *
1527          * @since 1.22
1528          *
1529          * @return string
1530          */
1531         public function getAction() {
1532                 // If an action is alredy provided, return it
1533                 if ( $this->mAction !== false ) {
1534                         return $this->mAction;
1535                 }
1536
1537                 $articlePath = $this->getConfig()->get( 'ArticlePath' );
1538                 // Check whether we are in GET mode and the ArticlePath contains a "?"
1539                 // meaning that getLocalURL() would return something like "index.php?title=...".
1540                 // As browser remove the query string before submitting GET forms,
1541                 // it means that the title would be lost. In such case use wfScript() instead
1542                 // and put title in an hidden field (see getHiddenFields()).
1543                 if ( strpos( $articlePath, '?' ) !== false && $this->getMethod() === 'get' ) {
1544                         return wfScript();
1545                 }
1546
1547                 return $this->getTitle()->getLocalURL();
1548         }
1549 }