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                 $valid = true;
 541                 $hoistedErrors = array();
 542                 $hoistedErrors[] = isset( $this->mValidationErrorMessage )
 543                         ? $this->mValidationErrorMessage
 544                         : array( 'htmlform-invalid-input' );
 545
 546                 $this->mWasSubmitted = true;
 547
 548                 # Check for cancelled submission
 549                 foreach ( $this->mFlatFields as $fieldname => $field ) {
 550                         if ( !empty( $field->mParams['nodata'] ) ) {
 551                                 continue;
 552                         }
 553                         if ( $field->cancelSubmit( $this->mFieldData[$fieldname], $this->mFieldData ) ) {
 554                                 $this->mWasSubmitted = false;
 555                                 return false;
 556                         }
 557                 }
 558
 559                 # Check for validation
 560                 foreach ( $this->mFlatFields as $fieldname => $field ) {
 561                         if ( !empty( $field->mParams['nodata'] ) ) {
 562                                 continue;
 563                         }
 564                         if ( $field->isHidden( $this->mFieldData ) ) {
 565                                 continue;
 566                         }
 567                         $res = $field->validate( $this->mFieldData[$fieldname], $this->mFieldData );
 568                         if ( $res !== true ) {
 569                                 $valid = false;
 570                                 if ( $res !== false && !$field->canDisplayErrors() ) {
 571                                         $hoistedErrors[] = array( 'rawmessage', $res );
 572                                 }
 573                         }
 574                 }
 575
 576                 if ( !$valid ) {
 577                         if ( count( $hoistedErrors ) === 1 ) {
 578                                 $hoistedErrors = $hoistedErrors[0];
 579                         }
 580                         return $hoistedErrors;
 581                 }
 582
 583                 $callback = $this->mSubmitCallback;
 584                 if ( !is_callable( $callback ) ) {
 585                         throw new MWException( 'HTMLForm: no submit callback provided. Use ' .
 586                                 'setSubmitCallback() to set one.' );
 587                 }
 588
 589                 $data = $this->filterDataForSubmit( $this->mFieldData );
 590
 591                 $res = call_user_func( $callback, $data, $this );
 592                 if ( $res === false ) {
 593                         $this->mWasSubmitted = false;
 594                 }
 595
 596                 return $res;
 597         }
 598
 599         /**
 600          * Test whether the form was considered to have been submitted or not, i.e.
 601          * whether the last call to tryAuthorizedSubmit or trySubmit returned
 602          * non-false.
 603          *
 604          * This will return false until HTMLForm::tryAuthorizedSubmit or
 605          * HTMLForm::trySubmit is called.
 606          *
 607          * @since 1.23
 608          * @return bool
 609          */
 610         function wasSubmitted() {
 611                 return $this->mWasSubmitted;
 612         }
 613
 614         /**
 615          * Set a callback to a function to do something with the form
 616          * once it's been successfully validated.
 617          *
 618          * @param callable $cb The function will be passed the output from
 619          *   HTMLForm::filterDataForSubmit and this HTMLForm object, and must
 620          *   return as documented for HTMLForm::trySubmit
 621          *
 622          * @return HTMLForm $this for chaining calls (since 1.20)
 623          */
 624         function setSubmitCallback( $cb ) {
 625                 $this->mSubmitCallback = $cb;
 626
 627                 return $this;
 628         }
 629
 630         /**
 631          * Set a message to display on a validation error.
 632          *
 633          * @param string|array $msg String or Array of valid inputs to wfMessage()
 634          *     (so each entry can be either a String or Array)
 635          *
 636          * @return HTMLForm $this for chaining calls (since 1.20)
 637          */
 638         function setValidationErrorMessage( $msg ) {
 639                 $this->mValidationErrorMessage = $msg;
 640
 641                 return $this;
 642         }
 643
 644         /**
 645          * Set the introductory message, overwriting any existing message.
 646          *
 647          * @param string $msg Complete text of message to display
 648          *
 649          * @return HTMLForm $this for chaining calls (since 1.20)
 650          */
 651         function setIntro( $msg ) {
 652                 $this->setPreText( $msg );
 653
 654                 return $this;
 655         }
 656
 657         /**
 658          * Set the introductory message, overwriting any existing message.
 659          * @since 1.19
 660          *
 661          * @param string $msg Complete text of message to display
 662          *
 663          * @return HTMLForm $this for chaining calls (since 1.20)
 664          */
 665         function setPreText( $msg ) {
 666                 $this->mPre = $msg;
 667
 668                 return $this;
 669         }
 670
 671         /**
 672          * Add introductory text.
 673          *
 674          * @param string $msg Complete text of message to display
 675          *
 676          * @return HTMLForm $this for chaining calls (since 1.20)
 677          */
 678         function addPreText( $msg ) {
 679                 $this->mPre .= $msg;
 680
 681                 return $this;
 682         }
 683
 684         /**
 685          * Add header text, inside the form.
 686          *
 687          * @param string $msg Complete text of message to display
 688          * @param string|null $section The section to add the header to
 689          *
 690          * @return HTMLForm $this for chaining calls (since 1.20)
 691          */
 692         function addHeaderText( $msg, $section = null ) {
 693                 if ( is_null( $section ) ) {
 694                         $this->mHeader .= $msg;
 695                 } else {
 696                         if ( !isset( $this->mSectionHeaders[$section] ) ) {
 697                                 $this->mSectionHeaders[$section] = '';
 698                         }
 699                         $this->mSectionHeaders[$section] .= $msg;
 700                 }
 701
 702                 return $this;
 703         }
 704
 705         /**
 706          * Set header text, inside the form.
 707          * @since 1.19
 708          *
 709          * @param string $msg Complete text of message to display
 710          * @param string|null $section The section to add the header to
 711          *
 712          * @return HTMLForm $this for chaining calls (since 1.20)
 713          */
 714         function setHeaderText( $msg, $section = null ) {
 715                 if ( is_null( $section ) ) {
 716                         $this->mHeader = $msg;
 717                 } else {
 718                         $this->mSectionHeaders[$section] = $msg;
 719                 }
 720
 721                 return $this;
 722         }
 723
 724         /**
 725          * Get header text.
 726          *
 727          * @param string|null $section The section to get the header text for
 728          * @since 1.26
 729          * @return string
 730          */
 731         function getHeaderText( $section = null ) {
 732                 if ( is_null( $section ) ) {
 733                         return $this->mHeader;
 734                 } else {
 735                         return isset( $this->mSectionHeaders[$section] ) ? $this->mSectionHeaders[$section] : '';
 736                 }
 737         }
 738
 739         /**
 740          * Add footer text, inside the form.
 741          *
 742          * @param string $msg Complete text of message to display
 743          * @param string|null $section The section to add the footer text to
 744          *
 745          * @return HTMLForm $this for chaining calls (since 1.20)
 746          */
 747         function addFooterText( $msg, $section = null ) {
 748                 if ( is_null( $section ) ) {
 749                         $this->mFooter .= $msg;
 750                 } else {
 751                         if ( !isset( $this->mSectionFooters[$section] ) ) {
 752                                 $this->mSectionFooters[$section] = '';
 753                         }
 754                         $this->mSectionFooters[$section] .= $msg;
 755                 }
 756
 757                 return $this;
 758         }
 759
 760         /**
 761          * Set footer text, inside the form.
 762          * @since 1.19
 763          *
 764          * @param string $msg Complete text of message to display
 765          * @param string|null $section The section to add the footer text to
 766          *
 767          * @return HTMLForm $this for chaining calls (since 1.20)
 768          */
 769         function setFooterText( $msg, $section = null ) {
 770                 if ( is_null( $section ) ) {
 771                         $this->mFooter = $msg;
 772                 } else {
 773                         $this->mSectionFooters[$section] = $msg;
 774                 }
 775
 776                 return $this;
 777         }
 778
 779         /**
 780          * Get footer text.
 781          *
 782          * @param string|null $section The section to get the footer text for
 783          * @since 1.26
 784          * @return string
 785          */
 786         function getFooterText( $section = null ) {
 787                 if ( is_null( $section ) ) {
 788                         return $this->mFooter;
 789                 } else {
 790                         return isset( $this->mSectionFooters[$section] ) ? $this->mSectionFooters[$section] : '';
 791                 }
 792         }
 793
 794         /**
 795          * Add text to the end of the display.
 796          *
 797          * @param string $msg Complete text of message to display
 798          *
 799          * @return HTMLForm $this for chaining calls (since 1.20)
 800          */
 801         function addPostText( $msg ) {
 802                 $this->mPost .= $msg;
 803
 804                 return $this;
 805         }
 806
 807         /**
 808          * Set text at the end of the display.
 809          *
 810          * @param string $msg Complete text of message to display
 811          *
 812          * @return HTMLForm $this for chaining calls (since 1.20)
 813          */
 814         function setPostText( $msg ) {
 815                 $this->mPost = $msg;
 816
 817                 return $this;
 818         }
 819
 820         /**
 821          * Add a hidden field to the output
 822          *
 823          * @param string $name Field name.  This will be used exactly as entered
 824          * @param string $value Field value
 825          * @param array $attribs
 826          *
 827          * @return HTMLForm $this for chaining calls (since 1.20)
 828          */
 829         public function addHiddenField( $name, $value, $attribs = array() ) {
 830                 $attribs += array( 'name' => $name );
 831                 $this->mHiddenFields[] = array( $value, $attribs );
 832
 833                 return $this;
 834         }
 835
 836         /**
 837          * Add an array of hidden fields to the output
 838          *
 839          * @since 1.22
 840          *
 841          * @param array $fields Associative array of fields to add;
 842          *        mapping names to their values
 843          *
 844          * @return HTMLForm $this for chaining calls
 845          */
 846         public function addHiddenFields( array $fields ) {
 847                 foreach ( $fields as $name => $value ) {
 848                         $this->mHiddenFields[] = array( $value, array( 'name' => $name ) );
 849                 }
 850
 851                 return $this;
 852         }
 853
 854         /**
 855          * Add a button to the form
 856          *
 857          * @param string $name Field name.
 858          * @param string $value Field value
 859          * @param string $id DOM id for the button (default: null)
 860          * @param array $attribs
 861          *
 862          * @return HTMLForm $this for chaining calls (since 1.20)
 863          */
 864         public function addButton( $name, $value, $id = null, $attribs = null ) {
 865                 $this->mButtons[] = compact( 'name', 'value', 'id', 'attribs' );
 866
 867                 return $this;
 868         }
 869
 870         /**
 871          * Set the salt for the edit token.
 872          *
 873          * Only useful when the method is "post".
 874          *
 875          * @since 1.24
 876          * @param string|array $salt Salt to use
 877          * @return HTMLForm $this For chaining calls
 878          */
 879         public function setTokenSalt( $salt ) {
 880                 $this->mTokenSalt = $salt;
 881
 882                 return $this;
 883         }
 884
 885         /**
 886          * Display the form (sending to the context's OutputPage object), with an
 887          * appropriate error message or stack of messages, and any validation errors, etc.
 888          *
 889          * @attention You should call prepareForm() before calling this function.
 890          * Moreover, when doing method chaining this should be the very last method
 891          * call just after prepareForm().
 892          *
 893          * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
 894          *
 895          * @return void Nothing, should be last call
 896          */
 897         function displayForm( $submitResult ) {
 898                 $this->getOutput()->addHTML( $this->getHTML( $submitResult ) );
 899         }
 900
 901         /**
 902          * Returns the raw HTML generated by the form
 903          *
 904          * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
 905          *
 906          * @return string
 907          */
 908         function getHTML( $submitResult ) {
 909                 # For good measure (it is the default)
 910                 $this->getOutput()->preventClickjacking();
 911                 $this->getOutput()->addModules( 'mediawiki.htmlform' );
 912                 $this->getOutput()->addModuleStyles( 'mediawiki.htmlform.styles' );
 913
 914                 $html = ''
 915                         . $this->getErrors( $submitResult )
 916                         . $this->getHeaderText()
 917                         . $this->getBody()
 918                         . $this->getHiddenFields()
 919                         . $this->getButtons()
 920                         . $this->getFooterText();
 921
 922                 $html = $this->wrapForm( $html );
 923
 924                 return '' . $this->mPre . $html . $this->mPost;
 925         }
 926
 927         /**
 928          * Get HTML attributes for the `<form>` tag.
 929          * @return array
 930          */
 931         protected function getFormAttributes() {
 932                 # Use multipart/form-data
 933                 $encType = $this->mUseMultipart
 934                         ? 'multipart/form-data'
 935                         : 'application/x-www-form-urlencoded';
 936                 # Attributes
 937                 $attribs = array(
 938                         'action' => $this->getAction(),
 939                         'method' => $this->getMethod(),
 940                         'enctype' => $encType,
 941                 );
 942                 if ( !empty( $this->mId ) ) {
 943                         $attribs['id'] = $this->mId;
 944                 }
 945                 return $attribs;
 946         }
 947
 948         /**
 949          * Wrap the form innards in an actual "<form>" element
 950          *
 951          * @param string $html HTML contents to wrap.
 952          *
 953          * @return string Wrapped HTML.
 954          */
 955         function wrapForm( $html ) {
 956                 # Include a <fieldset> wrapper for style, if requested.
 957                 if ( $this->mWrapperLegend !== false ) {
 958                         $legend = is_string( $this->mWrapperLegend ) ? $this->mWrapperLegend : false;
 959                         $html = Xml::fieldset( $legend, $html );
 960                 }
 961
 962                 return Html::rawElement( 'form', $this->getFormAttributes() + array( 'class' => 'visualClear' ), $html );
 963         }
 964
 965         /**
 966          * Get the hidden fields that should go inside the form.
 967          * @return string HTML.
 968          */
 969         function getHiddenFields() {
 970                 $html = '';
 971                 if ( $this->getMethod() == 'post' ) {
 972                         $html .= Html::hidden(
 973                                 'wpEditToken',
 974                                 $this->getUser()->getEditToken( $this->mTokenSalt ),
 975                                 array( 'id' => 'wpEditToken' )
 976                         ) . "\n";
 977                         $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
 978                 }
 979
 980                 $articlePath = $this->getConfig()->get( 'ArticlePath' );
 981                 if ( strpos( $articlePath, '?' ) !== false && $this->getMethod() == 'get' ) {
 982                         $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
 983                 }
 984
 985                 foreach ( $this->mHiddenFields as $data ) {
 986                         list( $value, $attribs ) = $data;
 987                         $html .= Html::hidden( $attribs['name'], $value, $attribs ) . "\n";
 988                 }
 989
 990                 return $html;
 991         }
 992
 993         /**
 994          * Get the submit and (potentially) reset buttons.
 995          * @return string HTML.
 996          */
 997         function getButtons() {
 998                 $buttons = '';
 999                 $useMediaWikiUIEverywhere = $this->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1000
1001                 if ( $this->mShowSubmit ) {
1002                         $attribs = array();
1003
1004                         if ( isset( $this->mSubmitID ) ) {
1005                                 $attribs['id'] = $this->mSubmitID;
1006                         }
1007
1008                         if ( isset( $this->mSubmitName ) ) {
1009                                 $attribs['name'] = $this->mSubmitName;
1010                         }
1011
1012                         if ( isset( $this->mSubmitTooltip ) ) {
1013                                 $attribs += Linker::tooltipAndAccesskeyAttribs( $this->mSubmitTooltip );
1014                         }
1015
1016                         $attribs['class'] = array( 'mw-htmlform-submit' );
1017
1018                         if ( $useMediaWikiUIEverywhere ) {
1019                                 foreach ( $this->mSubmitFlags as $flag ) {
1020                                         array_push( $attribs['class'], 'mw-ui-' . $flag );
1021                                 }
1022                                 array_push( $attribs['class'], 'mw-ui-button' );
1023                         }
1024
1025                         $buttons .= Xml::submitButton( $this->getSubmitText(), $attribs ) . "\n";
1026                 }
1027
1028                 if ( $this->mShowReset ) {
1029                         $buttons .= Html::element(
1030                                 'input',
1031                                 array(
1032                                         'type' => 'reset',
1033                                         'value' => $this->msg( 'htmlform-reset' )->text(),
1034                                         'class' => ( $useMediaWikiUIEverywhere ? 'mw-ui-button' : null ),
1035                                 )
1036                         ) . "\n";
1037                 }
1038
1039                 foreach ( $this->mButtons as $button ) {
1040                         $attrs = array(
1041                                 'type' => 'submit',
1042                                 'name' => $button['name'],
1043                                 'value' => $button['value']
1044                         );
1045
1046                         if ( $button['attribs'] ) {
1047                                 $attrs += $button['attribs'];
1048                         }
1049
1050                         if ( isset( $button['id'] ) ) {
1051                                 $attrs['id'] = $button['id'];
1052                         }
1053
1054                         if ( $useMediaWikiUIEverywhere ) {
1055                                 $attrs['class'] = isset( $attrs['class'] ) ? (array)$attrs['class'] : array();
1056                                 $attrs['class'][] = 'mw-ui-button';
1057                         }
1058
1059                         $buttons .= Html::element( 'input', $attrs ) . "\n";
1060                 }
1061
1062                 $html = Html::rawElement( 'span',
1063                         array( 'class' => 'mw-htmlform-submit-buttons' ), "\n$buttons" ) . "\n";
1064
1065                 return $html;
1066         }
1067
1068         /**
1069          * Get the whole body of the form.
1070          * @return string
1071          */
1072         function getBody() {
1073                 return $this->displaySection( $this->mFieldTree, $this->mTableId );
1074         }
1075
1076         /**
1077          * Format and display an error message stack.
1078          *
1079          * @param string|array|Status $errors
1080          *
1081          * @return string
1082          */
1083         function getErrors( $errors ) {
1084                 if ( $errors instanceof Status ) {
1085                         if ( $errors->isOK() ) {
1086                                 $errorstr = '';
1087                         } else {
1088                                 $errorstr = $this->getOutput()->parse( $errors->getWikiText() );
1089                         }
1090                 } elseif ( is_array( $errors ) ) {
1091                         $errorstr = $this->formatErrors( $errors );
1092                 } else {
1093                         $errorstr = $errors;
1094                 }
1095
1096                 return $errorstr
1097                         ? Html::rawElement( 'div', array( 'class' => 'error' ), $errorstr )
1098                         : '';
1099         }
1100
1101         /**
1102          * Format a stack of error messages into a single HTML string
1103          *
1104          * @param array $errors Array of message keys/values
1105          *
1106          * @return string HTML, a "<ul>" list of errors
1107          */
1108         public function formatErrors( $errors ) {
1109                 $errorstr = '';
1110
1111                 foreach ( $errors as $error ) {
1112                         if ( is_array( $error ) ) {
1113                                 $msg = array_shift( $error );
1114                         } else {
1115                                 $msg = $error;
1116                                 $error = array();
1117                         }
1118
1119                         $errorstr .= Html::rawElement(
1120                                 'li',
1121                                 array(),
1122                                 $this->msg( $msg, $error )->parse()
1123                         );
1124                 }
1125
1126                 $errorstr = Html::rawElement( 'ul', array(), $errorstr );
1127
1128                 return $errorstr;
1129         }
1130
1131         /**
1132          * Set the text for the submit button
1133          *
1134          * @param string $t Plaintext
1135          *
1136          * @return HTMLForm $this for chaining calls (since 1.20)
1137          */
1138         function setSubmitText( $t ) {
1139                 $this->mSubmitText = $t;
1140
1141                 return $this;
1142         }
1143
1144         /**
1145          * Identify that the submit button in the form has a destructive action
1146          * @since 1.24
1147          */
1148         public function setSubmitDestructive() {
1149                 $this->mSubmitFlags = array( 'destructive', 'primary' );
1150         }
1151
1152         /**
1153          * Identify that the submit button in the form has a progressive action
1154          * @since 1.25
1155          */
1156         public function setSubmitProgressive() {
1157                 $this->mSubmitFlags = array( 'progressive', 'primary' );
1158         }
1159
1160         /**
1161          * Set the text for the submit button to a message
1162          * @since 1.19
1163          *
1164          * @param string|Message $msg Message key or Message object
1165          *
1166          * @return HTMLForm $this for chaining calls (since 1.20)
1167          */
1168         public function setSubmitTextMsg( $msg ) {
1169                 if ( !$msg instanceof Message ) {
1170                         $msg = $this->msg( $msg );
1171                 }
1172                 $this->setSubmitText( $msg->text() );
1173
1174                 return $this;
1175         }
1176
1177         /**
1178          * Get the text for the submit button, either customised or a default.
1179          * @return string
1180          */
1181         function getSubmitText() {
1182                 return $this->mSubmitText
1183                         ? $this->mSubmitText
1184                         : $this->msg( 'htmlform-submit' )->text();
1185         }
1186
1187         /**
1188          * @param string $name Submit button name
1189          *
1190          * @return HTMLForm $this for chaining calls (since 1.20)
1191          */
1192         public function setSubmitName( $name ) {
1193                 $this->mSubmitName = $name;
1194
1195                 return $this;
1196         }
1197
1198         /**
1199          * @param string $name Tooltip for the submit button
1200          *
1201          * @return HTMLForm $this for chaining calls (since 1.20)
1202          */
1203         public function setSubmitTooltip( $name ) {
1204                 $this->mSubmitTooltip = $name;
1205
1206                 return $this;
1207         }
1208
1209         /**
1210          * Set the id for the submit button.
1211          *
1212          * @param string $t
1213          *
1214          * @todo FIXME: Integrity of $t is *not* validated
1215          * @return HTMLForm $this for chaining calls (since 1.20)
1216          */
1217         function setSubmitID( $t ) {
1218                 $this->mSubmitID = $t;
1219
1220                 return $this;
1221         }
1222
1223         /**
1224          * Stop a default submit button being shown for this form. This implies that an
1225          * alternate submit method must be provided manually.
1226          *
1227          * @since 1.22
1228          *
1229          * @param bool $suppressSubmit Set to false to re-enable the button again
1230          *
1231          * @return HTMLForm $this for chaining calls
1232          */
1233         function suppressDefaultSubmit( $suppressSubmit = true ) {
1234                 $this->mShowSubmit = !$suppressSubmit;
1235
1236                 return $this;
1237         }
1238
1239         /**
1240          * Set the id of the \<table\> or outermost \<div\> element.
1241          *
1242          * @since 1.22
1243          *
1244          * @param string $id New value of the id attribute, or "" to remove
1245          *
1246          * @return HTMLForm $this for chaining calls
1247          */
1248         public function setTableId( $id ) {
1249                 $this->mTableId = $id;
1250
1251                 return $this;
1252         }
1253
1254         /**
1255          * @param string $id DOM id for the form
1256          *
1257          * @return HTMLForm $this for chaining calls (since 1.20)
1258          */
1259         public function setId( $id ) {
1260                 $this->mId = $id;
1261
1262                 return $this;
1263         }
1264
1265         /**
1266          * Prompt the whole form to be wrapped in a "<fieldset>", with
1267          * this text as its "<legend>" element.
1268          *
1269          * @param string|bool $legend If false, no wrapper or legend will be displayed.
1270          *     If true, a wrapper will be displayed, but no legend.
1271          *     If a string, a wrapper will be displayed with that string as a legend.
1272          *     The string will be escaped before being output (this doesn't support HTML).
1273          *
1274          * @return HTMLForm $this for chaining calls (since 1.20)
1275          */
1276         public function setWrapperLegend( $legend ) {
1277                 $this->mWrapperLegend = $legend;
1278
1279                 return $this;
1280         }
1281
1282         /**
1283          * Prompt the whole form to be wrapped in a "<fieldset>", with
1284          * this message as its "<legend>" element.
1285          * @since 1.19
1286          *
1287          * @param string|Message $msg Message key or Message object
1288          *
1289          * @return HTMLForm $this for chaining calls (since 1.20)
1290          */
1291         public function setWrapperLegendMsg( $msg ) {
1292                 if ( !$msg instanceof Message ) {
1293                         $msg = $this->msg( $msg );
1294                 }
1295                 $this->setWrapperLegend( $msg->text() );
1296
1297                 return $this;
1298         }
1299
1300         /**
1301          * Set the prefix for various default messages
1302          * @todo Currently only used for the "<fieldset>" legend on forms
1303          * with multiple sections; should be used elsewhere?
1304          *
1305          * @param string $p
1306          *
1307          * @return HTMLForm $this for chaining calls (since 1.20)
1308          */
1309         function setMessagePrefix( $p ) {
1310                 $this->mMessagePrefix = $p;
1311
1312                 return $this;
1313         }
1314
1315         /**
1316          * Set the title for form submission
1317          *
1318          * @param Title $t Title of page the form is on/should be posted to
1319          *
1320          * @return HTMLForm $this for chaining calls (since 1.20)
1321          */
1322         function setTitle( $t ) {
1323                 $this->mTitle = $t;
1324
1325                 return $this;
1326         }
1327
1328         /**
1329          * Get the title
1330          * @return Title
1331          */
1332         function getTitle() {
1333                 return $this->mTitle === false
1334                         ? $this->getContext()->getTitle()
1335                         : $this->mTitle;
1336         }
1337
1338         /**
1339          * Set the method used to submit the form
1340          *
1341          * @param string $method
1342          *
1343          * @return HTMLForm $this for chaining calls (since 1.20)
1344          */
1345         public function setMethod( $method = 'post' ) {
1346                 $this->mMethod = strtolower( $method );
1347
1348                 return $this;
1349         }
1350
1351         /**
1352          * @return string Always lowercase
1353          */
1354         public function getMethod() {
1355                 return $this->mMethod;
1356         }
1357
1358         /**
1359          * @todo Document
1360          *
1361          * @param array[]|HTMLFormField[] $fields Array of fields (either arrays or
1362          *   objects).
1363          * @param string $sectionName ID attribute of the "<table>" tag for this
1364          *   section, ignored if empty.
1365          * @param string $fieldsetIDPrefix ID prefix for the "<fieldset>" tag of
1366          *   each subsection, ignored if empty.
1367          * @param bool &$hasUserVisibleFields Whether the section had user-visible fields.
1368          *
1369          * @return string
1370          */
1371         public function displaySection( $fields,
1372                 $sectionName = '',
1373                 $fieldsetIDPrefix = '',
1374                 &$hasUserVisibleFields = false ) {
1375                 $displayFormat = $this->getDisplayFormat();
1376
1377                 $html = array();
1378                 $subsectionHtml = '';
1379                 $hasLabel = false;
1380
1381                 // Conveniently, PHP method names are case-insensitive.
1382                 $getFieldHtmlMethod = $displayFormat == 'table' ? 'getTableRow' : ( 'get' . $displayFormat );
1383
1384                 foreach ( $fields as $key => $value ) {
1385                         if ( $value instanceof HTMLFormField ) {
1386                                 $v = empty( $value->mParams['nodata'] )
1387                                         ? $this->mFieldData[$key]
1388                                         : $value->getDefault();
1389                                 $html[] = $value->$getFieldHtmlMethod( $v );
1390
1391                                 $labelValue = trim( $value->getLabel() );
1392                                 if ( $labelValue != '&#160;' && $labelValue !== '' ) {
1393                                         $hasLabel = true;
1394                                 }
1395
1396                                 if ( get_class( $value ) !== 'HTMLHiddenField' &&
1397                                         get_class( $value ) !== 'HTMLApiField'
1398                                 ) {
1399                                         $hasUserVisibleFields = true;
1400                                 }
1401                         } elseif ( is_array( $value ) ) {
1402                                 $subsectionHasVisibleFields = false;
1403                                 $section =
1404                                         $this->displaySection( $value,
1405                                                 "mw-htmlform-$key",
1406                                                 "$fieldsetIDPrefix$key-",
1407                                                 $subsectionHasVisibleFields );
1408                                 $legend = null;
1409
1410                                 if ( $subsectionHasVisibleFields === true ) {
1411                                         // Display the section with various niceties.
1412                                         $hasUserVisibleFields = true;
1413
1414                                         $legend = $this->getLegend( $key );
1415
1416                                         $section = $this->getHeaderText( $key ) .
1417                                                 $section .
1418                                                 $this->getFooterText( $key );
1419
1420                                         $attributes = array();
1421                                         if ( $fieldsetIDPrefix ) {
1422                                                 $attributes['id'] = Sanitizer::escapeId( "$fieldsetIDPrefix$key" );
1423                                         }
1424                                         $subsectionHtml .= Xml::fieldset( $legend, $section, $attributes ) . "\n";
1425                                 } else {
1426                                         // Just return the inputs, nothing fancy.
1427                                         $subsectionHtml .= $section;
1428                                 }
1429                         }
1430                 }
1431
1432                 $html = $this->formatSection( $html, $sectionName, $hasLabel );
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          * Put a form section together from the individual fields' HTML, merging it and wrapping.
1447          * @param array $fieldsHtml
1448          * @param string $sectionName
1449          * @param bool $anyFieldHasLabel
1450          * @return string HTML
1451          */
1452         protected function formatSection( array $fieldsHtml, $sectionName, $anyFieldHasLabel ) {
1453                 $displayFormat = $this->getDisplayFormat();
1454                 $html = implode( '', $fieldsHtml );
1455
1456                 if ( $displayFormat === 'raw' ) {
1457                         return $html;
1458                 }
1459
1460                 $classes = array();
1461
1462                 if ( !$anyFieldHasLabel ) { // Avoid strange spacing when no labels exist
1463                         $classes[] = 'mw-htmlform-nolabel';
1464                 }
1465
1466                 $attribs = array(
1467                         'class' => implode( ' ', $classes ),
1468                 );
1469
1470                 if ( $sectionName ) {
1471                         $attribs['id'] = Sanitizer::escapeId( $sectionName );
1472                 }
1473
1474                 if ( $displayFormat === 'table' ) {
1475                         return Html::rawElement( 'table',
1476                                         $attribs,
1477                                         Html::rawElement( 'tbody', array(), "\n$html\n" ) ) . "\n";
1478                 } elseif ( $displayFormat === 'inline' ) {
1479                         return Html::rawElement( 'span', $attribs, "\n$html\n" );
1480                 } else {
1481                         return Html::rawElement( 'div', $attribs, "\n$html\n" );
1482                 }
1483         }
1484
1485         /**
1486          * Construct the form fields from the Descriptor array
1487          */
1488         function loadData() {
1489                 $fieldData = array();
1490
1491                 foreach ( $this->mFlatFields as $fieldname => $field ) {
1492                         if ( !empty( $field->mParams['nodata'] ) ) {
1493                                 continue;
1494                         } elseif ( !empty( $field->mParams['disabled'] ) ) {
1495                                 $fieldData[$fieldname] = $field->getDefault();
1496                         } else {
1497                                 $fieldData[$fieldname] = $field->loadDataFromRequest( $this->getRequest() );
1498                         }
1499                 }
1500
1501                 # Filter data.
1502                 foreach ( $fieldData as $name => &$value ) {
1503                         $field = $this->mFlatFields[$name];
1504                         $value = $field->filter( $value, $this->mFlatFields );
1505                 }
1506
1507                 $this->mFieldData = $fieldData;
1508         }
1509
1510         /**
1511          * Stop a reset button being shown for this form
1512          *
1513          * @param bool $suppressReset Set to false to re-enable the button again
1514          *
1515          * @return HTMLForm $this for chaining calls (since 1.20)
1516          */
1517         function suppressReset( $suppressReset = true ) {
1518                 $this->mShowReset = !$suppressReset;
1519
1520                 return $this;
1521         }
1522
1523         /**
1524          * Overload this if you want to apply special filtration routines
1525          * to the form as a whole, after it's submitted but before it's
1526          * processed.
1527          *
1528          * @param array $data
1529          *
1530          * @return array
1531          */
1532         function filterDataForSubmit( $data ) {
1533                 return $data;
1534         }
1535
1536         /**
1537          * Get a string to go in the "<legend>" of a section fieldset.
1538          * Override this if you want something more complicated.
1539          *
1540          * @param string $key
1541          *
1542          * @return string
1543          */
1544         public function getLegend( $key ) {
1545                 return $this->msg( "{$this->mMessagePrefix}-$key" )->text();
1546         }
1547
1548         /**
1549          * Set the value for the action attribute of the form.
1550          * When set to false (which is the default state), the set title is used.
1551          *
1552          * @since 1.19
1553          *
1554          * @param string|bool $action
1555          *
1556          * @return HTMLForm $this for chaining calls (since 1.20)
1557          */
1558         public function setAction( $action ) {
1559                 $this->mAction = $action;
1560
1561                 return $this;
1562         }
1563
1564         /**
1565          * Get the value for the action attribute of the form.
1566          *
1567          * @since 1.22
1568          *
1569          * @return string
1570          */
1571         public function getAction() {
1572                 // If an action is alredy provided, return it
1573                 if ( $this->mAction !== false ) {
1574                         return $this->mAction;
1575                 }
1576
1577                 $articlePath = $this->getConfig()->get( 'ArticlePath' );
1578                 // Check whether we are in GET mode and the ArticlePath contains a "?"
1579                 // meaning that getLocalURL() would return something like "index.php?title=...".
1580                 // As browser remove the query string before submitting GET forms,
1581                 // it means that the title would be lost. In such case use wfScript() instead
1582                 // and put title in an hidden field (see getHiddenFields()).
1583                 if ( strpos( $articlePath, '?' ) !== false && $this->getMethod() === 'get' ) {
1584                         return wfScript();
1585                 }
1586
1587                 return $this->getTitle()->getLocalURL();
1588         }
1589 }