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                 'combobox' => 'HTMLComboboxField',
 132                 'radio' => 'HTMLRadioField',
 133                 'multiselect' => 'HTMLMultiSelectField',
 134                 'limitselect' => 'HTMLSelectLimitField',
 135                 'check' => 'HTMLCheckField',
 136                 'toggle' => 'HTMLCheckField',
 137                 'int' => 'HTMLIntField',
 138                 'float' => 'HTMLFloatField',
 139                 'info' => 'HTMLInfoField',
 140                 'selectorother' => 'HTMLSelectOrOtherField',
 141                 'selectandother' => 'HTMLSelectAndOtherField',
 142                 'namespaceselect' => 'HTMLSelectNamespace',
 143                 'namespaceselectwithbutton' => 'HTMLSelectNamespaceWithButton',
 144                 'tagfilter' => 'HTMLTagFilter',
 145                 'submit' => 'HTMLSubmitField',
 146                 'hidden' => 'HTMLHiddenField',
 147                 'edittools' => 'HTMLEditTools',
 148                 'checkmatrix' => 'HTMLCheckMatrix',
 149                 'cloner' => 'HTMLFormFieldCloner',
 150                 'autocompleteselect' => 'HTMLAutoCompleteSelectField',
 151                 // HTMLTextField will output the correct type="" attribute automagically.
 152                 // There are about four zillion other HTML5 input types, like range, but
 153                 // we don't use those at the moment, so no point in adding all of them.
 154                 'email' => 'HTMLTextField',
 155                 'password' => 'HTMLTextField',
 156                 'url' => 'HTMLTextField',
 157                 'title' => 'HTMLTitleTextField',
 158                 'user' => 'HTMLUserTextField',
 159         );
 160
 161         public $mFieldData;
 162
 163         protected $mMessagePrefix;
 164
 165         /** @var HTMLFormField[] */
 166         protected $mFlatFields;
 167
 168         protected $mFieldTree;
 169         protected $mShowReset = false;
 170         protected $mShowSubmit = true;
 171         protected $mSubmitFlags = array( 'constructive', 'primary' );
 172
 173         protected $mSubmitCallback;
 174         protected $mValidationErrorMessage;
 175
 176         protected $mPre = '';
 177         protected $mHeader = '';
 178         protected $mFooter = '';
 179         protected $mSectionHeaders = array();
 180         protected $mSectionFooters = array();
 181         protected $mPost = '';
 182         protected $mId;
 183         protected $mTableId = '';
 184
 185         protected $mSubmitID;
 186         protected $mSubmitName;
 187         protected $mSubmitText;
 188         protected $mSubmitTooltip;
 189
 190         protected $mTitle;
 191         protected $mMethod = 'post';
 192         protected $mWasSubmitted = false;
 193
 194         /**
 195          * Form action URL. false means we will use the URL to set Title
 196          * @since 1.19
 197          * @var bool|string
 198          */
 199         protected $mAction = false;
 200
 201         protected $mUseMultipart = false;
 202         protected $mHiddenFields = array();
 203         protected $mButtons = array();
 204
 205         protected $mWrapperLegend = false;
 206
 207         /**
 208          * Salt for the edit token.
 209          * @var string|array
 210          */
 211         protected $mTokenSalt = '';
 212
 213         /**
 214          * If true, sections that contain both fields and subsections will
 215          * render their subsections before their fields.
 216          *
 217          * Subclasses may set this to false to render subsections after fields
 218          * instead.
 219          */
 220         protected $mSubSectionBeforeFields = true;
 221
 222         /**
 223          * Format in which to display form. For viable options,
 224          * @see $availableDisplayFormats
 225          * @var string
 226          */
 227         protected $displayFormat = 'table';
 228
 229         /**
 230          * Available formats in which to display the form
 231          * @var array
 232          */
 233         protected $availableDisplayFormats = array(
 234                 'table',
 235                 'div',
 236                 'raw',
 237                 'inline',
 238         );
 239
 240         /**
 241          * Available formats in which to display the form
 242          * @var array
 243          */
 244         protected $availableSubclassDisplayFormats = array(
 245                 'vform',
 246                 'ooui',
 247         );
 248
 249         /**
 250          * Construct a HTMLForm object for given display type. May return a HTMLForm subclass.
 251          *
 252          * @param string $displayFormat
 253          * @param mixed $arguments... Additional arguments to pass to the constructor.
 254          * @return HTMLForm
 255          */
 256         public static function factory( $displayFormat/*, $arguments...*/ ) {
 257                 $arguments = func_get_args();
 258                 array_shift( $arguments );
 259
 260                 switch ( $displayFormat ) {
 261                         case 'vform':
 262                                 $reflector = new ReflectionClass( 'VFormHTMLForm' );
 263                                 return $reflector->newInstanceArgs( $arguments );
 264                         case 'ooui':
 265                                 $reflector = new ReflectionClass( 'OOUIHTMLForm' );
 266                                 return $reflector->newInstanceArgs( $arguments );
 267                         default:
 268                                 $reflector = new ReflectionClass( 'HTMLForm' );
 269                                 $form = $reflector->newInstanceArgs( $arguments );
 270                                 $form->setDisplayFormat( $displayFormat );
 271                                 return $form;
 272                 }
 273         }
 274
 275         /**
 276          * Build a new HTMLForm from an array of field attributes
 277          *
 278          * @param array $descriptor Array of Field constructs, as described above
 279          * @param IContextSource $context Available since 1.18, will become compulsory in 1.18.
 280          *     Obviates the need to call $form->setTitle()
 281          * @param string $messagePrefix A prefix to go in front of default messages
 282          */
 283         public function __construct( $descriptor, /*IContextSource*/ $context = null,
 284                 $messagePrefix = ''
 285         ) {
 286                 if ( $context instanceof IContextSource ) {
 287                         $this->setContext( $context );
 288                         $this->mTitle = false; // We don't need them to set a title
 289                         $this->mMessagePrefix = $messagePrefix;
 290                 } elseif ( is_null( $context ) && $messagePrefix !== '' ) {
 291                         $this->mMessagePrefix = $messagePrefix;
 292                 } elseif ( is_string( $context ) && $messagePrefix === '' ) {
 293                         // B/C since 1.18
 294                         // it's actually $messagePrefix
 295                         $this->mMessagePrefix = $context;
 296                 }
 297
 298                 // Evil hack for mobile :(
 299                 if (
 300                         !$this->getConfig()->get( 'HTMLFormAllowTableFormat' )
 301                         && $this->displayFormat === 'table'
 302                 ) {
 303                         $this->displayFormat = 'div';
 304                 }
 305
 306                 // Expand out into a tree.
 307                 $loadedDescriptor = array();
 308                 $this->mFlatFields = array();
 309
 310                 foreach ( $descriptor as $fieldname => $info ) {
 311                         $section = isset( $info['section'] )
 312                                 ? $info['section']
 313                                 : '';
 314
 315                         if ( isset( $info['type'] ) && $info['type'] == 'file' ) {
 316                                 $this->mUseMultipart = true;
 317                         }
 318
 319                         $field = static::loadInputFromParameters( $fieldname, $info, $this );
 320
 321                         $setSection =& $loadedDescriptor;
 322                         if ( $section ) {
 323                                 $sectionParts = explode( '/', $section );
 324
 325                                 while ( count( $sectionParts ) ) {
 326                                         $newName = array_shift( $sectionParts );
 327
 328                                         if ( !isset( $setSection[$newName] ) ) {
 329                                                 $setSection[$newName] = array();
 330                                         }
 331
 332                                         $setSection =& $setSection[$newName];
 333                                 }
 334                         }
 335
 336                         $setSection[$fieldname] = $field;
 337                         $this->mFlatFields[$fieldname] = $field;
 338                 }
 339
 340                 $this->mFieldTree = $loadedDescriptor;
 341         }
 342
 343         /**
 344          * Set format in which to display the form
 345          *
 346          * @param string $format The name of the format to use, must be one of
 347          *   $this->availableDisplayFormats
 348          *
 349          * @throws MWException
 350          * @since 1.20
 351          * @return HTMLForm $this for chaining calls (since 1.20)
 352          */
 353         public function setDisplayFormat( $format ) {
 354                 if (
 355                         in_array( $format, $this->availableSubclassDisplayFormats ) ||
 356                         in_array( $this->displayFormat, $this->availableSubclassDisplayFormats )
 357                 ) {
 358                         throw new MWException( 'Cannot change display format after creation, ' .
 359                                 'use HTMLForm::factory() instead' );
 360                 }
 361
 362                 if ( !in_array( $format, $this->availableDisplayFormats ) ) {
 363                         throw new MWException( 'Display format must be one of ' .
 364                                 print_r( $this->availableDisplayFormats, true ) );
 365                 }
 366
 367                 // Evil hack for mobile :(
 368                 if ( !$this->getConfig()->get( 'HTMLFormAllowTableFormat' ) && $format === 'table' ) {
 369                         $format = 'div';
 370                 }
 371
 372                 $this->displayFormat = $format;
 373
 374                 return $this;
 375         }
 376
 377         /**
 378          * Getter for displayFormat
 379          * @since 1.20
 380          * @return string
 381          */
 382         public function getDisplayFormat() {
 383                 return $this->displayFormat;
 384         }
 385
 386         /**
 387          * Test if displayFormat is 'vform'
 388          * @since 1.22
 389          * @deprecated since 1.25
 390          * @return bool
 391          */
 392         public function isVForm() {
 393                 wfDeprecated( __METHOD__, '1.25' );
 394                 return false;
 395         }
 396
 397         /**
 398          * Get the HTMLFormField subclass for this descriptor.
 399          *
 400          * The descriptor can be passed either 'class' which is the name of
 401          * a HTMLFormField subclass, or a shorter 'type' which is an alias.
 402          * This makes sure the 'class' is always set, and also is returned by
 403          * this function for ease.
 404          *
 405          * @since 1.23
 406          *
 407          * @param string $fieldname Name of the field
 408          * @param array $descriptor Input Descriptor, as described above
 409          *
 410          * @throws MWException
 411          * @return string Name of a HTMLFormField subclass
 412          */
 413         public static function getClassFromDescriptor( $fieldname, &$descriptor ) {
 414                 if ( isset( $descriptor['class'] ) ) {
 415                         $class = $descriptor['class'];
 416                 } elseif ( isset( $descriptor['type'] ) ) {
 417                         $class = static::$typeMappings[$descriptor['type']];
 418                         $descriptor['class'] = $class;
 419                 } else {
 420                         $class = null;
 421                 }
 422
 423                 if ( !$class ) {
 424                         throw new MWException( "Descriptor with no class for $fieldname: "
 425                                 . print_r( $descriptor, true ) );
 426                 }
 427
 428                 return $class;
 429         }
 430
 431         /**
 432          * Initialise a new Object for the field
 433          *
 434          * @param string $fieldname Name of the field
 435          * @param array $descriptor Input Descriptor, as described above
 436          * @param HTMLForm|null $parent Parent instance of HTMLForm
 437          *
 438          * @throws MWException
 439          * @return HTMLFormField Instance of a subclass of HTMLFormField
 440          */
 441         public static function loadInputFromParameters( $fieldname, $descriptor,
 442                 HTMLForm $parent = null
 443         ) {
 444                 $class = static::getClassFromDescriptor( $fieldname, $descriptor );
 445
 446                 $descriptor['fieldname'] = $fieldname;
 447                 if ( $parent ) {
 448                         $descriptor['parent'] = $parent;
 449                 }
 450
 451                 # @todo This will throw a fatal error whenever someone try to use
 452                 # 'class' to feed a CSS class instead of 'cssclass'. Would be
 453                 # great to avoid the fatal error and show a nice error.
 454                 $obj = new $class( $descriptor );
 455
 456                 return $obj;
 457         }
 458
 459         /**
 460          * Prepare form for submission.
 461          *
 462          * @attention When doing method chaining, that should be the very last
 463          * method call before displayForm().
 464          *
 465          * @throws MWException
 466          * @return HTMLForm $this for chaining calls (since 1.20)
 467          */
 468         function prepareForm() {
 469                 # Check if we have the info we need
 470                 if ( !$this->mTitle instanceof Title && $this->mTitle !== false ) {
 471                         throw new MWException( "You must call setTitle() on an HTMLForm" );
 472                 }
 473
 474                 # Load data from the request.
 475                 $this->loadData();
 476
 477                 return $this;
 478         }
 479
 480         /**
 481          * Try submitting, with edit token check first
 482          * @return Status|bool
 483          */
 484         function tryAuthorizedSubmit() {
 485                 $result = false;
 486
 487                 $submit = false;
 488                 if ( $this->getMethod() != 'post' ) {
 489                         $submit = true; // no session check needed
 490                 } elseif ( $this->getRequest()->wasPosted() ) {
 491                         $editToken = $this->getRequest()->getVal( 'wpEditToken' );
 492                         if ( $this->getUser()->isLoggedIn() || $editToken != null ) {
 493                                 // Session tokens for logged-out users have no security value.
 494                                 // However, if the user gave one, check it in order to give a nice
 495                                 // "session expired" error instead of "permission denied" or such.
 496                                 $submit = $this->getUser()->matchEditToken( $editToken, $this->mTokenSalt );
 497                         } else {
 498                                 $submit = true;
 499                         }
 500                 }
 501
 502                 if ( $submit ) {
 503                         $this->mWasSubmitted = true;
 504                         $result = $this->trySubmit();
 505                 }
 506
 507                 return $result;
 508         }
 509
 510         /**
 511          * The here's-one-I-made-earlier option: do the submission if
 512          * posted, or display the form with or without funky validation
 513          * errors
 514          * @return bool|Status Whether submission was successful.
 515          */
 516         function show() {
 517                 $this->prepareForm();
 518
 519                 $result = $this->tryAuthorizedSubmit();
 520                 if ( $result === true || ( $result instanceof Status && $result->isGood() ) ) {
 521                         return $result;
 522                 }
 523
 524                 $this->displayForm( $result );
 525
 526                 return false;
 527         }
 528
 529         /**
 530          * Validate all the fields, and call the submission callback
 531          * function if everything is kosher.
 532          * @throws MWException
 533          * @return bool|string|array|Status
 534          *     - Bool true or a good Status object indicates success,
 535          *     - Bool false indicates no submission was attempted,
 536          *     - Anything else indicates failure. The value may be a fatal Status
 537          *       object, an HTML string, or an array of arrays (message keys and
 538          *       params) or strings (message keys)
 539          */
 540         function trySubmit() {
 541                 $valid = true;
 542                 $hoistedErrors = array();
 543                 $hoistedErrors[] = isset( $this->mValidationErrorMessage )
 544                         ? $this->mValidationErrorMessage
 545                         : array( 'htmlform-invalid-input' );
 546
 547                 $this->mWasSubmitted = true;
 548
 549                 # Check for cancelled submission
 550                 foreach ( $this->mFlatFields as $fieldname => $field ) {
 551                         if ( !empty( $field->mParams['nodata'] ) ) {
 552                                 continue;
 553                         }
 554                         if ( $field->cancelSubmit( $this->mFieldData[$fieldname], $this->mFieldData ) ) {
 555                                 $this->mWasSubmitted = false;
 556                                 return false;
 557                         }
 558                 }
 559
 560                 # Check for validation
 561                 foreach ( $this->mFlatFields as $fieldname => $field ) {
 562                         if ( !empty( $field->mParams['nodata'] ) ) {
 563                                 continue;
 564                         }
 565                         if ( $field->isHidden( $this->mFieldData ) ) {
 566                                 continue;
 567                         }
 568                         $res = $field->validate( $this->mFieldData[$fieldname], $this->mFieldData );
 569                         if ( $res !== true ) {
 570                                 $valid = false;
 571                                 if ( $res !== false && !$field->canDisplayErrors() ) {
 572                                         $hoistedErrors[] = array( 'rawmessage', $res );
 573                                 }
 574                         }
 575                 }
 576
 577                 if ( !$valid ) {
 578                         if ( count( $hoistedErrors ) === 1 ) {
 579                                 $hoistedErrors = $hoistedErrors[0];
 580                         }
 581                         return $hoistedErrors;
 582                 }
 583
 584                 $callback = $this->mSubmitCallback;
 585                 if ( !is_callable( $callback ) ) {
 586                         throw new MWException( 'HTMLForm: no submit callback provided. Use ' .
 587                                 'setSubmitCallback() to set one.' );
 588                 }
 589
 590                 $data = $this->filterDataForSubmit( $this->mFieldData );
 591
 592                 $res = call_user_func( $callback, $data, $this );
 593                 if ( $res === false ) {
 594                         $this->mWasSubmitted = false;
 595                 }
 596
 597                 return $res;
 598         }
 599
 600         /**
 601          * Test whether the form was considered to have been submitted or not, i.e.
 602          * whether the last call to tryAuthorizedSubmit or trySubmit returned
 603          * non-false.
 604          *
 605          * This will return false until HTMLForm::tryAuthorizedSubmit or
 606          * HTMLForm::trySubmit is called.
 607          *
 608          * @since 1.23
 609          * @return bool
 610          */
 611         function wasSubmitted() {
 612                 return $this->mWasSubmitted;
 613         }
 614
 615         /**
 616          * Set a callback to a function to do something with the form
 617          * once it's been successfully validated.
 618          *
 619          * @param callable $cb The function will be passed the output from
 620          *   HTMLForm::filterDataForSubmit and this HTMLForm object, and must
 621          *   return as documented for HTMLForm::trySubmit
 622          *
 623          * @return HTMLForm $this for chaining calls (since 1.20)
 624          */
 625         function setSubmitCallback( $cb ) {
 626                 $this->mSubmitCallback = $cb;
 627
 628                 return $this;
 629         }
 630
 631         /**
 632          * Set a message to display on a validation error.
 633          *
 634          * @param string|array $msg String or Array of valid inputs to wfMessage()
 635          *     (so each entry can be either a String or Array)
 636          *
 637          * @return HTMLForm $this for chaining calls (since 1.20)
 638          */
 639         function setValidationErrorMessage( $msg ) {
 640                 $this->mValidationErrorMessage = $msg;
 641
 642                 return $this;
 643         }
 644
 645         /**
 646          * Set the introductory message, overwriting any existing message.
 647          *
 648          * @param string $msg Complete text of message to display
 649          *
 650          * @return HTMLForm $this for chaining calls (since 1.20)
 651          */
 652         function setIntro( $msg ) {
 653                 $this->setPreText( $msg );
 654
 655                 return $this;
 656         }
 657
 658         /**
 659          * Set the introductory message, overwriting any existing message.
 660          * @since 1.19
 661          *
 662          * @param string $msg Complete text of message to display
 663          *
 664          * @return HTMLForm $this for chaining calls (since 1.20)
 665          */
 666         function setPreText( $msg ) {
 667                 $this->mPre = $msg;
 668
 669                 return $this;
 670         }
 671
 672         /**
 673          * Add introductory text.
 674          *
 675          * @param string $msg Complete text of message to display
 676          *
 677          * @return HTMLForm $this for chaining calls (since 1.20)
 678          */
 679         function addPreText( $msg ) {
 680                 $this->mPre .= $msg;
 681
 682                 return $this;
 683         }
 684
 685         /**
 686          * Add header text, inside the form.
 687          *
 688          * @param string $msg Complete text of message to display
 689          * @param string|null $section The section to add the header to
 690          *
 691          * @return HTMLForm $this for chaining calls (since 1.20)
 692          */
 693         function addHeaderText( $msg, $section = null ) {
 694                 if ( is_null( $section ) ) {
 695                         $this->mHeader .= $msg;
 696                 } else {
 697                         if ( !isset( $this->mSectionHeaders[$section] ) ) {
 698                                 $this->mSectionHeaders[$section] = '';
 699                         }
 700                         $this->mSectionHeaders[$section] .= $msg;
 701                 }
 702
 703                 return $this;
 704         }
 705
 706         /**
 707          * Set header text, inside the form.
 708          * @since 1.19
 709          *
 710          * @param string $msg Complete text of message to display
 711          * @param string|null $section The section to add the header to
 712          *
 713          * @return HTMLForm $this for chaining calls (since 1.20)
 714          */
 715         function setHeaderText( $msg, $section = null ) {
 716                 if ( is_null( $section ) ) {
 717                         $this->mHeader = $msg;
 718                 } else {
 719                         $this->mSectionHeaders[$section] = $msg;
 720                 }
 721
 722                 return $this;
 723         }
 724
 725         /**
 726          * Get header text.
 727          *
 728          * @param string|null $section The section to get the header text for
 729          * @since 1.26
 730          * @return string
 731          */
 732         function getHeaderText( $section = null ) {
 733                 if ( is_null( $section ) ) {
 734                         return $this->mHeader;
 735                 } else {
 736                         return isset( $this->mSectionHeaders[$section] ) ? $this->mSectionHeaders[$section] : '';
 737                 }
 738         }
 739
 740         /**
 741          * Add footer text, inside the form.
 742          *
 743          * @param string $msg Complete text of message to display
 744          * @param string|null $section The section to add the footer text to
 745          *
 746          * @return HTMLForm $this for chaining calls (since 1.20)
 747          */
 748         function addFooterText( $msg, $section = null ) {
 749                 if ( is_null( $section ) ) {
 750                         $this->mFooter .= $msg;
 751                 } else {
 752                         if ( !isset( $this->mSectionFooters[$section] ) ) {
 753                                 $this->mSectionFooters[$section] = '';
 754                         }
 755                         $this->mSectionFooters[$section] .= $msg;
 756                 }
 757
 758                 return $this;
 759         }
 760
 761         /**
 762          * Set footer text, inside the form.
 763          * @since 1.19
 764          *
 765          * @param string $msg Complete text of message to display
 766          * @param string|null $section The section to add the footer text to
 767          *
 768          * @return HTMLForm $this for chaining calls (since 1.20)
 769          */
 770         function setFooterText( $msg, $section = null ) {
 771                 if ( is_null( $section ) ) {
 772                         $this->mFooter = $msg;
 773                 } else {
 774                         $this->mSectionFooters[$section] = $msg;
 775                 }
 776
 777                 return $this;
 778         }
 779
 780         /**
 781          * Get footer text.
 782          *
 783          * @param string|null $section The section to get the footer text for
 784          * @since 1.26
 785          * @return string
 786          */
 787         function getFooterText( $section = null ) {
 788                 if ( is_null( $section ) ) {
 789                         return $this->mFooter;
 790                 } else {
 791                         return isset( $this->mSectionFooters[$section] ) ? $this->mSectionFooters[$section] : '';
 792                 }
 793         }
 794
 795         /**
 796          * Add text to the end of the display.
 797          *
 798          * @param string $msg Complete text of message to display
 799          *
 800          * @return HTMLForm $this for chaining calls (since 1.20)
 801          */
 802         function addPostText( $msg ) {
 803                 $this->mPost .= $msg;
 804
 805                 return $this;
 806         }
 807
 808         /**
 809          * Set text at the end of the display.
 810          *
 811          * @param string $msg Complete text of message to display
 812          *
 813          * @return HTMLForm $this for chaining calls (since 1.20)
 814          */
 815         function setPostText( $msg ) {
 816                 $this->mPost = $msg;
 817
 818                 return $this;
 819         }
 820
 821         /**
 822          * Add a hidden field to the output
 823          *
 824          * @param string $name Field name.  This will be used exactly as entered
 825          * @param string $value Field value
 826          * @param array $attribs
 827          *
 828          * @return HTMLForm $this for chaining calls (since 1.20)
 829          */
 830         public function addHiddenField( $name, $value, $attribs = array() ) {
 831                 $attribs += array( 'name' => $name );
 832                 $this->mHiddenFields[] = array( $value, $attribs );
 833
 834                 return $this;
 835         }
 836
 837         /**
 838          * Add an array of hidden fields to the output
 839          *
 840          * @since 1.22
 841          *
 842          * @param array $fields Associative array of fields to add;
 843          *        mapping names to their values
 844          *
 845          * @return HTMLForm $this for chaining calls
 846          */
 847         public function addHiddenFields( array $fields ) {
 848                 foreach ( $fields as $name => $value ) {
 849                         $this->mHiddenFields[] = array( $value, array( 'name' => $name ) );
 850                 }
 851
 852                 return $this;
 853         }
 854
 855         /**
 856          * Add a button to the form
 857          *
 858          * @param string $name Field name.
 859          * @param string $value Field value
 860          * @param string $id DOM id for the button (default: null)
 861          * @param array $attribs
 862          *
 863          * @return HTMLForm $this for chaining calls (since 1.20)
 864          */
 865         public function addButton( $name, $value, $id = null, $attribs = null ) {
 866                 $this->mButtons[] = compact( 'name', 'value', 'id', 'attribs' );
 867
 868                 return $this;
 869         }
 870
 871         /**
 872          * Set the salt for the edit token.
 873          *
 874          * Only useful when the method is "post".
 875          *
 876          * @since 1.24
 877          * @param string|array $salt Salt to use
 878          * @return HTMLForm $this For chaining calls
 879          */
 880         public function setTokenSalt( $salt ) {
 881                 $this->mTokenSalt = $salt;
 882
 883                 return $this;
 884         }
 885
 886         /**
 887          * Display the form (sending to the context's OutputPage object), with an
 888          * appropriate error message or stack of messages, and any validation errors, etc.
 889          *
 890          * @attention You should call prepareForm() before calling this function.
 891          * Moreover, when doing method chaining this should be the very last method
 892          * call just after prepareForm().
 893          *
 894          * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
 895          *
 896          * @return void Nothing, should be last call
 897          */
 898         function displayForm( $submitResult ) {
 899                 $this->getOutput()->addHTML( $this->getHTML( $submitResult ) );
 900         }
 901
 902         /**
 903          * Returns the raw HTML generated by the form
 904          *
 905          * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
 906          *
 907          * @return string
 908          */
 909         function getHTML( $submitResult ) {
 910                 # For good measure (it is the default)
 911                 $this->getOutput()->preventClickjacking();
 912                 $this->getOutput()->addModules( 'mediawiki.htmlform' );
 913                 $this->getOutput()->addModuleStyles( 'mediawiki.htmlform.styles' );
 914
 915                 $html = ''
 916                         . $this->getErrors( $submitResult )
 917                         . $this->getHeaderText()
 918                         . $this->getBody()
 919                         . $this->getHiddenFields()
 920                         . $this->getButtons()
 921                         . $this->getFooterText();
 922
 923                 $html = $this->wrapForm( $html );
 924
 925                 return '' . $this->mPre . $html . $this->mPost;
 926         }
 927
 928         /**
 929          * Get HTML attributes for the `<form>` tag.
 930          * @return array
 931          */
 932         protected function getFormAttributes() {
 933                 # Use multipart/form-data
 934                 $encType = $this->mUseMultipart
 935                         ? 'multipart/form-data'
 936                         : 'application/x-www-form-urlencoded';
 937                 # Attributes
 938                 $attribs = array(
 939                         'action' => $this->getAction(),
 940                         'method' => $this->getMethod(),
 941                         'enctype' => $encType,
 942                 );
 943                 if ( !empty( $this->mId ) ) {
 944                         $attribs['id'] = $this->mId;
 945                 }
 946                 return $attribs;
 947         }
 948
 949         /**
 950          * Wrap the form innards in an actual "<form>" element
 951          *
 952          * @param string $html HTML contents to wrap.
 953          *
 954          * @return string Wrapped HTML.
 955          */
 956         function wrapForm( $html ) {
 957                 # Include a <fieldset> wrapper for style, if requested.
 958                 if ( $this->mWrapperLegend !== false ) {
 959                         $legend = is_string( $this->mWrapperLegend ) ? $this->mWrapperLegend : false;
 960                         $html = Xml::fieldset( $legend, $html );
 961                 }
 962
 963                 return Html::rawElement(
 964                         'form',
 965                         $this->getFormAttributes() + array( 'class' => 'visualClear' ),
 966                         $html
 967                 );
 968         }
 969
 970         /**
 971          * Get the hidden fields that should go inside the form.
 972          * @return string HTML.
 973          */
 974         function getHiddenFields() {
 975                 $html = '';
 976                 if ( $this->getMethod() == 'post' ) {
 977                         $html .= Html::hidden(
 978                                 'wpEditToken',
 979                                 $this->getUser()->getEditToken( $this->mTokenSalt ),
 980                                 array( 'id' => 'wpEditToken' )
 981                         ) . "\n";
 982                         $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
 983                 }
 984
 985                 $articlePath = $this->getConfig()->get( 'ArticlePath' );
 986                 if ( strpos( $articlePath, '?' ) !== false && $this->getMethod() == 'get' ) {
 987                         $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
 988                 }
 989
 990                 foreach ( $this->mHiddenFields as $data ) {
 991                         list( $value, $attribs ) = $data;
 992                         $html .= Html::hidden( $attribs['name'], $value, $attribs ) . "\n";
 993                 }
 994
 995                 return $html;
 996         }
 997
 998         /**
 999          * Get the submit and (potentially) reset buttons.
1000          * @return string HTML.
1001          */
1002         function getButtons() {
1003                 $buttons = '';
1004                 $useMediaWikiUIEverywhere = $this->getConfig()->get( 'UseMediaWikiUIEverywhere' );
1005
1006                 if ( $this->mShowSubmit ) {
1007                         $attribs = array();
1008
1009                         if ( isset( $this->mSubmitID ) ) {
1010                                 $attribs['id'] = $this->mSubmitID;
1011                         }
1012
1013                         if ( isset( $this->mSubmitName ) ) {
1014                                 $attribs['name'] = $this->mSubmitName;
1015                         }
1016
1017                         if ( isset( $this->mSubmitTooltip ) ) {
1018                                 $attribs += Linker::tooltipAndAccesskeyAttribs( $this->mSubmitTooltip );
1019                         }
1020
1021                         $attribs['class'] = array( 'mw-htmlform-submit' );
1022
1023                         if ( $useMediaWikiUIEverywhere ) {
1024                                 foreach ( $this->mSubmitFlags as $flag ) {
1025                                         array_push( $attribs['class'], 'mw-ui-' . $flag );
1026                                 }
1027                                 array_push( $attribs['class'], 'mw-ui-button' );
1028                         }
1029
1030                         $buttons .= Xml::submitButton( $this->getSubmitText(), $attribs ) . "\n";
1031                 }
1032
1033                 if ( $this->mShowReset ) {
1034                         $buttons .= Html::element(
1035                                 'input',
1036                                 array(
1037                                         'type' => 'reset',
1038                                         'value' => $this->msg( 'htmlform-reset' )->text(),
1039                                         'class' => ( $useMediaWikiUIEverywhere ? 'mw-ui-button' : null ),
1040                                 )
1041                         ) . "\n";
1042                 }
1043
1044                 foreach ( $this->mButtons as $button ) {
1045                         $attrs = array(
1046                                 'type' => 'submit',
1047                                 'name' => $button['name'],
1048                                 'value' => $button['value']
1049                         );
1050
1051                         if ( $button['attribs'] ) {
1052                                 $attrs += $button['attribs'];
1053                         }
1054
1055                         if ( isset( $button['id'] ) ) {
1056                                 $attrs['id'] = $button['id'];
1057                         }
1058
1059                         if ( $useMediaWikiUIEverywhere ) {
1060                                 $attrs['class'] = isset( $attrs['class'] ) ? (array)$attrs['class'] : array();
1061                                 $attrs['class'][] = 'mw-ui-button';
1062                         }
1063
1064                         $buttons .= Html::element( 'input', $attrs ) . "\n";
1065                 }
1066
1067                 $html = Html::rawElement( 'span',
1068                         array( 'class' => 'mw-htmlform-submit-buttons' ), "\n$buttons" ) . "\n";
1069
1070                 return $html;
1071         }
1072
1073         /**
1074          * Get the whole body of the form.
1075          * @return string
1076          */
1077         function getBody() {
1078                 return $this->displaySection( $this->mFieldTree, $this->mTableId );
1079         }
1080
1081         /**
1082          * Format and display an error message stack.
1083          *
1084          * @param string|array|Status $errors
1085          *
1086          * @return string
1087          */
1088         function getErrors( $errors ) {
1089                 if ( $errors instanceof Status ) {
1090                         if ( $errors->isOK() ) {
1091                                 $errorstr = '';
1092                         } else {
1093                                 $errorstr = $this->getOutput()->parse( $errors->getWikiText() );
1094                         }
1095                 } elseif ( is_array( $errors ) ) {
1096                         $errorstr = $this->formatErrors( $errors );
1097                 } else {
1098                         $errorstr = $errors;
1099                 }
1100
1101                 return $errorstr
1102                         ? Html::rawElement( 'div', array( 'class' => 'error' ), $errorstr )
1103                         : '';
1104         }
1105
1106         /**
1107          * Format a stack of error messages into a single HTML string
1108          *
1109          * @param array $errors Array of message keys/values
1110          *
1111          * @return string HTML, a "<ul>" list of errors
1112          */
1113         public function formatErrors( $errors ) {
1114                 $errorstr = '';
1115
1116                 foreach ( $errors as $error ) {
1117                         if ( is_array( $error ) ) {
1118                                 $msg = array_shift( $error );
1119                         } else {
1120                                 $msg = $error;
1121                                 $error = array();
1122                         }
1123
1124                         $errorstr .= Html::rawElement(
1125                                 'li',
1126                                 array(),
1127                                 $this->msg( $msg, $error )->parse()
1128                         );
1129                 }
1130
1131                 $errorstr = Html::rawElement( 'ul', array(), $errorstr );
1132
1133                 return $errorstr;
1134         }
1135
1136         /**
1137          * Set the text for the submit button
1138          *
1139          * @param string $t Plaintext
1140          *
1141          * @return HTMLForm $this for chaining calls (since 1.20)
1142          */
1143         function setSubmitText( $t ) {
1144                 $this->mSubmitText = $t;
1145
1146                 return $this;
1147         }
1148
1149         /**
1150          * Identify that the submit button in the form has a destructive action
1151          * @since 1.24
1152          */
1153         public function setSubmitDestructive() {
1154                 $this->mSubmitFlags = array( 'destructive', 'primary' );
1155         }
1156
1157         /**
1158          * Identify that the submit button in the form has a progressive action
1159          * @since 1.25
1160          */
1161         public function setSubmitProgressive() {
1162                 $this->mSubmitFlags = array( 'progressive', 'primary' );
1163         }
1164
1165         /**
1166          * Set the text for the submit button to a message
1167          * @since 1.19
1168          *
1169          * @param string|Message $msg Message key or Message object
1170          *
1171          * @return HTMLForm $this for chaining calls (since 1.20)
1172          */
1173         public function setSubmitTextMsg( $msg ) {
1174                 if ( !$msg instanceof Message ) {
1175                         $msg = $this->msg( $msg );
1176                 }
1177                 $this->setSubmitText( $msg->text() );
1178
1179                 return $this;
1180         }
1181
1182         /**
1183          * Get the text for the submit button, either customised or a default.
1184          * @return string
1185          */
1186         function getSubmitText() {
1187                 return $this->mSubmitText
1188                         ? $this->mSubmitText
1189                         : $this->msg( 'htmlform-submit' )->text();
1190         }
1191
1192         /**
1193          * @param string $name Submit button name
1194          *
1195          * @return HTMLForm $this for chaining calls (since 1.20)
1196          */
1197         public function setSubmitName( $name ) {
1198                 $this->mSubmitName = $name;
1199
1200                 return $this;
1201         }
1202
1203         /**
1204          * @param string $name Tooltip for the submit button
1205          *
1206          * @return HTMLForm $this for chaining calls (since 1.20)
1207          */
1208         public function setSubmitTooltip( $name ) {
1209                 $this->mSubmitTooltip = $name;
1210
1211                 return $this;
1212         }
1213
1214         /**
1215          * Set the id for the submit button.
1216          *
1217          * @param string $t
1218          *
1219          * @todo FIXME: Integrity of $t is *not* validated
1220          * @return HTMLForm $this for chaining calls (since 1.20)
1221          */
1222         function setSubmitID( $t ) {
1223                 $this->mSubmitID = $t;
1224
1225                 return $this;
1226         }
1227
1228         /**
1229          * Stop a default submit button being shown for this form. This implies that an
1230          * alternate submit method must be provided manually.
1231          *
1232          * @since 1.22
1233          *
1234          * @param bool $suppressSubmit Set to false to re-enable the button again
1235          *
1236          * @return HTMLForm $this for chaining calls
1237          */
1238         function suppressDefaultSubmit( $suppressSubmit = true ) {
1239                 $this->mShowSubmit = !$suppressSubmit;
1240
1241                 return $this;
1242         }
1243
1244         /**
1245          * Set the id of the \<table\> or outermost \<div\> element.
1246          *
1247          * @since 1.22
1248          *
1249          * @param string $id New value of the id attribute, or "" to remove
1250          *
1251          * @return HTMLForm $this for chaining calls
1252          */
1253         public function setTableId( $id ) {
1254                 $this->mTableId = $id;
1255
1256                 return $this;
1257         }
1258
1259         /**
1260          * @param string $id DOM id for the form
1261          *
1262          * @return HTMLForm $this for chaining calls (since 1.20)
1263          */
1264         public function setId( $id ) {
1265                 $this->mId = $id;
1266
1267                 return $this;
1268         }
1269
1270         /**
1271          * Prompt the whole form to be wrapped in a "<fieldset>", with
1272          * this text as its "<legend>" element.
1273          *
1274          * @param string|bool $legend If false, no wrapper or legend will be displayed.
1275          *     If true, a wrapper will be displayed, but no legend.
1276          *     If a string, a wrapper will be displayed with that string as a legend.
1277          *     The string will be escaped before being output (this doesn't support HTML).
1278          *
1279          * @return HTMLForm $this for chaining calls (since 1.20)
1280          */
1281         public function setWrapperLegend( $legend ) {
1282                 $this->mWrapperLegend = $legend;
1283
1284                 return $this;
1285         }
1286
1287         /**
1288          * Prompt the whole form to be wrapped in a "<fieldset>", with
1289          * this message as its "<legend>" element.
1290          * @since 1.19
1291          *
1292          * @param string|Message $msg Message key or Message object
1293          *
1294          * @return HTMLForm $this for chaining calls (since 1.20)
1295          */
1296         public function setWrapperLegendMsg( $msg ) {
1297                 if ( !$msg instanceof Message ) {
1298                         $msg = $this->msg( $msg );
1299                 }
1300                 $this->setWrapperLegend( $msg->text() );
1301
1302                 return $this;
1303         }
1304
1305         /**
1306          * Set the prefix for various default messages
1307          * @todo Currently only used for the "<fieldset>" legend on forms
1308          * with multiple sections; should be used elsewhere?
1309          *
1310          * @param string $p
1311          *
1312          * @return HTMLForm $this for chaining calls (since 1.20)
1313          */
1314         function setMessagePrefix( $p ) {
1315                 $this->mMessagePrefix = $p;
1316
1317                 return $this;
1318         }
1319
1320         /**
1321          * Set the title for form submission
1322          *
1323          * @param Title $t Title of page the form is on/should be posted to
1324          *
1325          * @return HTMLForm $this for chaining calls (since 1.20)
1326          */
1327         function setTitle( $t ) {
1328                 $this->mTitle = $t;
1329
1330                 return $this;
1331         }
1332
1333         /**
1334          * Get the title
1335          * @return Title
1336          */
1337         function getTitle() {
1338                 return $this->mTitle === false
1339                         ? $this->getContext()->getTitle()
1340                         : $this->mTitle;
1341         }
1342
1343         /**
1344          * Set the method used to submit the form
1345          *
1346          * @param string $method
1347          *
1348          * @return HTMLForm $this for chaining calls (since 1.20)
1349          */
1350         public function setMethod( $method = 'post' ) {
1351                 $this->mMethod = strtolower( $method );
1352
1353                 return $this;
1354         }
1355
1356         /**
1357          * @return string Always lowercase
1358          */
1359         public function getMethod() {
1360                 return $this->mMethod;
1361         }
1362
1363         /**
1364          * Wraps the given $section into an user-visible fieldset.
1365          *
1366          * @param string $legend Legend text for the fieldset
1367          * @param string $section The section content in plain Html
1368          * @param array $attributes Additional attributes for the fieldset
1369          * @return string The fieldset's Html
1370          */
1371         protected function wrapFieldSetSection( $legend, $section, $attributes ) {
1372                 return Xml::fieldset( $legend, $section, $attributes ) . "\n";
1373         }
1374
1375         /**
1376          * @todo Document
1377          *
1378          * @param array[]|HTMLFormField[] $fields Array of fields (either arrays or
1379          *   objects).
1380          * @param string $sectionName ID attribute of the "<table>" tag for this
1381          *   section, ignored if empty.
1382          * @param string $fieldsetIDPrefix ID prefix for the "<fieldset>" tag of
1383          *   each subsection, ignored if empty.
1384          * @param bool &$hasUserVisibleFields Whether the section had user-visible fields.
1385          *
1386          * @return string
1387          */
1388         public function displaySection( $fields,
1389                 $sectionName = '',
1390                 $fieldsetIDPrefix = '',
1391                 &$hasUserVisibleFields = false ) {
1392                 $displayFormat = $this->getDisplayFormat();
1393
1394                 $html = array();
1395                 $subsectionHtml = '';
1396                 $hasLabel = false;
1397
1398                 // Conveniently, PHP method names are case-insensitive.
1399                 $getFieldHtmlMethod = $displayFormat == 'table' ? 'getTableRow' : ( 'get' . $displayFormat );
1400
1401                 foreach ( $fields as $key => $value ) {
1402                         if ( $value instanceof HTMLFormField ) {
1403                                 $v = empty( $value->mParams['nodata'] )
1404                                         ? $this->mFieldData[$key]
1405                                         : $value->getDefault();
1406
1407                                 $retval = $value->$getFieldHtmlMethod( $v );
1408
1409                                 // check, if the form field should be added to
1410                                 // the output.
1411                                 if ( $value->hasVisibleOutput() ) {
1412                                         $html[] = $retval;
1413
1414                                         $labelValue = trim( $value->getLabel() );
1415                                         if ( $labelValue != '&#160;' && $labelValue !== '' ) {
1416                                                 $hasLabel = true;
1417                                         }
1418
1419                                         $hasUserVisibleFields = true;
1420                                 }
1421                         } elseif ( is_array( $value ) ) {
1422                                 $subsectionHasVisibleFields = false;
1423                                 $section =
1424                                         $this->displaySection( $value,
1425                                                 "mw-htmlform-$key",
1426                                                 "$fieldsetIDPrefix$key-",
1427                                                 $subsectionHasVisibleFields );
1428                                 $legend = null;
1429
1430                                 if ( $subsectionHasVisibleFields === true ) {
1431                                         // Display the section with various niceties.
1432                                         $hasUserVisibleFields = true;
1433
1434                                         $legend = $this->getLegend( $key );
1435
1436                                         $section = $this->getHeaderText( $key ) .
1437                                                 $section .
1438                                                 $this->getFooterText( $key );
1439
1440                                         $attributes = array();
1441                                         if ( $fieldsetIDPrefix ) {
1442                                                 $attributes['id'] = Sanitizer::escapeId( "$fieldsetIDPrefix$key" );
1443                                         }
1444                                         $subsectionHtml .= $this->wrapFieldSetSection( $legend, $section, $attributes );
1445                                 } else {
1446                                         // Just return the inputs, nothing fancy.
1447                                         $subsectionHtml .= $section;
1448                                 }
1449                         }
1450                 }
1451
1452                 $html = $this->formatSection( $html, $sectionName, $hasLabel );
1453
1454                 if ( $subsectionHtml ) {
1455                         if ( $this->mSubSectionBeforeFields ) {
1456                                 return $subsectionHtml . "\n" . $html;
1457                         } else {
1458                                 return $html . "\n" . $subsectionHtml;
1459                         }
1460                 } else {
1461                         return $html;
1462                 }
1463         }
1464
1465         /**
1466          * Put a form section together from the individual fields' HTML, merging it and wrapping.
1467          * @param array $fieldsHtml
1468          * @param string $sectionName
1469          * @param bool $anyFieldHasLabel
1470          * @return string HTML
1471          */
1472         protected function formatSection( array $fieldsHtml, $sectionName, $anyFieldHasLabel ) {
1473                 $displayFormat = $this->getDisplayFormat();
1474                 $html = implode( '', $fieldsHtml );
1475
1476                 if ( $displayFormat === 'raw' ) {
1477                         return $html;
1478                 }
1479
1480                 $classes = array();
1481
1482                 if ( !$anyFieldHasLabel ) { // Avoid strange spacing when no labels exist
1483                         $classes[] = 'mw-htmlform-nolabel';
1484                 }
1485
1486                 $attribs = array(
1487                         'class' => implode( ' ', $classes ),
1488                 );
1489
1490                 if ( $sectionName ) {
1491                         $attribs['id'] = Sanitizer::escapeId( $sectionName );
1492                 }
1493
1494                 if ( $displayFormat === 'table' ) {
1495                         return Html::rawElement( 'table',
1496                                         $attribs,
1497                                         Html::rawElement( 'tbody', array(), "\n$html\n" ) ) . "\n";
1498                 } elseif ( $displayFormat === 'inline' ) {
1499                         return Html::rawElement( 'span', $attribs, "\n$html\n" );
1500                 } else {
1501                         return Html::rawElement( 'div', $attribs, "\n$html\n" );
1502                 }
1503         }
1504
1505         /**
1506          * Construct the form fields from the Descriptor array
1507          */
1508         function loadData() {
1509                 $fieldData = array();
1510
1511                 foreach ( $this->mFlatFields as $fieldname => $field ) {
1512                         if ( !empty( $field->mParams['nodata'] ) ) {
1513                                 continue;
1514                         } elseif ( !empty( $field->mParams['disabled'] ) ) {
1515                                 $fieldData[$fieldname] = $field->getDefault();
1516                         } else {
1517                                 $fieldData[$fieldname] = $field->loadDataFromRequest( $this->getRequest() );
1518                         }
1519                 }
1520
1521                 # Filter data.
1522                 foreach ( $fieldData as $name => &$value ) {
1523                         $field = $this->mFlatFields[$name];
1524                         $value = $field->filter( $value, $this->mFlatFields );
1525                 }
1526
1527                 $this->mFieldData = $fieldData;
1528         }
1529
1530         /**
1531          * Stop a reset button being shown for this form
1532          *
1533          * @param bool $suppressReset Set to false to re-enable the button again
1534          *
1535          * @return HTMLForm $this for chaining calls (since 1.20)
1536          */
1537         function suppressReset( $suppressReset = true ) {
1538                 $this->mShowReset = !$suppressReset;
1539
1540                 return $this;
1541         }
1542
1543         /**
1544          * Overload this if you want to apply special filtration routines
1545          * to the form as a whole, after it's submitted but before it's
1546          * processed.
1547          *
1548          * @param array $data
1549          *
1550          * @return array
1551          */
1552         function filterDataForSubmit( $data ) {
1553                 return $data;
1554         }
1555
1556         /**
1557          * Get a string to go in the "<legend>" of a section fieldset.
1558          * Override this if you want something more complicated.
1559          *
1560          * @param string $key
1561          *
1562          * @return string
1563          */
1564         public function getLegend( $key ) {
1565                 return $this->msg( "{$this->mMessagePrefix}-$key" )->text();
1566         }
1567
1568         /**
1569          * Set the value for the action attribute of the form.
1570          * When set to false (which is the default state), the set title is used.
1571          *
1572          * @since 1.19
1573          *
1574          * @param string|bool $action
1575          *
1576          * @return HTMLForm $this for chaining calls (since 1.20)
1577          */
1578         public function setAction( $action ) {
1579                 $this->mAction = $action;
1580
1581                 return $this;
1582         }
1583
1584         /**
1585          * Get the value for the action attribute of the form.
1586          *
1587          * @since 1.22
1588          *
1589          * @return string
1590          */
1591         public function getAction() {
1592                 // If an action is alredy provided, return it
1593                 if ( $this->mAction !== false ) {
1594                         return $this->mAction;
1595                 }
1596
1597                 $articlePath = $this->getConfig()->get( 'ArticlePath' );
1598                 // Check whether we are in GET mode and the ArticlePath contains a "?"
1599                 // meaning that getLocalURL() would return something like "index.php?title=...".
1600                 // As browser remove the query string before submitting GET forms,
1601                 // it means that the title would be lost. In such case use wfScript() instead
1602                 // and put title in an hidden field (see getHiddenFields()).
1603                 if ( strpos( $articlePath, '?' ) !== false && $this->getMethod() === 'get' ) {
1604                         return wfScript();
1605                 }
1606
1607                 return $this->getTitle()->getLocalURL();
1608         }
1609 }