Followup r81034, remove the global statements

[mediawiki.git] / includes / HTMLForm.php

<?php
/**
 * Object handling generic submission, CSRF protection, layout and
 * other logic for UI forms. in a reusable manner.
 *
 * In order to generate the form, the HTMLForm object takes an array
 * structure detailing the form fields available. Each element of the
 * array is a basic property-list, including the type of field, the
 * label it is to be given in the form, callbacks for validation and
 * 'filtering', and other pertinent information.
 *
 * Field types are implemented as subclasses of the generic HTMLFormField
 * object, and typically implement at least getInputHTML, which generates
 * the HTML for the input field to be placed in the table.
 *
 * The constructor input is an associative array of $fieldname => $info,
 * where $info is an Associative Array with any of the following:
 *
 *      'class'               -- the subclass of HTMLFormField that will be used
 *                               to create the object.  *NOT* the CSS class!
 *      'type'                -- roughly translates into the <select> type attribute.
 *                               if 'class' is not specified, this is used as a map
 *                               through HTMLForm::$typeMappings to get the class name.
 *      'default'             -- default value when the form is displayed
 *      'id'                  -- HTML id attribute
 *      'cssclass'            -- CSS class
 *      'options'             -- varies according to the specific object.
 *      'label-message'       -- message key for a message to use as the label.
 *                               can be an array of msg key and then parameters to
 *                               the message.
 *      'label'               -- alternatively, a raw text message. Overridden by
 *                               label-message
 *      'help-message'        -- message key for a message to use as a help text.
 *                               can be an array of msg key and then parameters to
 *                               the message.
 *                           Overwrites 'help-messages'.
 *  'help-messages'       -- array of message key. As above, each item can
 *                           be an array of msg key and then parameters.
 *                           Overwrites 'help-message'.
 *      'required'            -- passed through to the object, indicating that it
 *                               is a required field.
 *      'size'                -- the length of text fields
 *      'filter-callback      -- a function name to give you the chance to
 *                               massage the inputted value before it's processed.
 *                               @see HTMLForm::filter()
 *      'validation-callback' -- a function name to give you the chance
 *                               to impose extra validation on the field input.
 *                               @see HTMLForm::validate()
 *      'name'                -- By default, the 'name' attribute of the input field
 *                               is "wp{$fieldname}".  If you want a different name
 *                               (eg one without the "wp" prefix), specify it here and
 *                               it will be used without modification.
 *
 * TODO: Document 'section' / 'subsection' stuff
 */
class HTMLForm {
        static $jsAdded = false;

        # A mapping of 'type' inputs onto standard HTMLFormField subclasses
        static $typeMappings = array(
                'text' => 'HTMLTextField',
                'textarea' => 'HTMLTextAreaField',
                'select' => 'HTMLSelectField',
                'radio' => 'HTMLRadioField',
                'multiselect' => 'HTMLMultiSelectField',
                'check' => 'HTMLCheckField',
                'toggle' => 'HTMLCheckField',
                'int' => 'HTMLIntField',
                'float' => 'HTMLFloatField',
                'info' => 'HTMLInfoField',
                'selectorother' => 'HTMLSelectOrOtherField',
                'submit' => 'HTMLSubmitField',
                'hidden' => 'HTMLHiddenField',
                'edittools' => 'HTMLEditTools',

                # HTMLTextField will output the correct type="" attribute automagically.
                # There are about four zillion other HTML5 input types, like url, but
                # we don't use those at the moment, so no point in adding all of them.
                'email' => 'HTMLTextField',
                'password' => 'HTMLTextField',
        );

        protected $mMessagePrefix;
        protected $mFlatFields;
        protected $mFieldTree;
        protected $mShowReset = false;
        public $mFieldData;

        protected $mSubmitCallback;
        protected $mValidationErrorMessage;

        protected $mPre = '';
        protected $mHeader = '';
        protected $mFooter = '';
        protected $mSectionHeaders = array();
        protected $mSectionFooters = array();
        protected $mPost = '';
        protected $mId;

        protected $mSubmitID;
        protected $mSubmitName;
        protected $mSubmitText;
        protected $mSubmitTooltip;
        protected $mTitle;
        protected $mMethod = 'post';

        protected $mUseMultipart = false;
        protected $mHiddenFields = array();
        protected $mButtons = array();

        protected $mWrapperLegend = false;

        /**
         * Build a new HTMLForm from an array of field attributes
         * @param $descriptor Array of Field constructs, as described above
         * @param $messagePrefix String a prefix to go in front of default messages
         */
        public function __construct( $descriptor, $messagePrefix = '' ) {
                $this->mMessagePrefix = $messagePrefix;

                // Expand out into a tree.
                $loadedDescriptor = array();
                $this->mFlatFields = array();

                foreach ( $descriptor as $fieldname => $info ) {
                        $section = isset( $info['section'] )
                                ? $info['section']
                                : '';

                        if ( isset( $info['type'] ) && $info['type'] == 'file' ) {
                                $this->mUseMultipart = true;
                        }

                        $field = self::loadInputFromParameters( $fieldname, $info );
                        $field->mParent = $this;

                        $setSection =& $loadedDescriptor;
                        if ( $section ) {
                                $sectionParts = explode( '/', $section );

                                while ( count( $sectionParts ) ) {
                                        $newName = array_shift( $sectionParts );

                                        if ( !isset( $setSection[$newName] ) ) {
                                                $setSection[$newName] = array();
                                        }

                                        $setSection =& $setSection[$newName];
                                }
                        }

                        $setSection[$fieldname] = $field;
                        $this->mFlatFields[$fieldname] = $field;
                }

                $this->mFieldTree = $loadedDescriptor;
        }

        /**
         * Add the HTMLForm-specific JavaScript, if it hasn't been
         * done already.
         */
        static function addJS() {
                if ( self::$jsAdded ) return;

                global $wgOut;

                $wgOut->addModules( 'mediawiki.legacy.htmlform' );
        }

        /**
         * Initialise a new Object for the field
         * @param $descriptor input Descriptor, as described above
         * @return HTMLFormField subclass
         */
        static function loadInputFromParameters( $fieldname, $descriptor ) {
                if ( isset( $descriptor['class'] ) ) {
                        $class = $descriptor['class'];
                } elseif ( isset( $descriptor['type'] ) ) {
                        $class = self::$typeMappings[$descriptor['type']];
                        $descriptor['class'] = $class;
                }

                if ( !$class ) {
                        throw new MWException( "Descriptor with no class: " . print_r( $descriptor, true ) );
                }
                
                $descriptor['fieldname'] = $fieldname;

                $obj = new $class( $descriptor );

                return $obj;
        }

        /**
         * Prepare form for submission
         */
        function prepareForm() {
                # Check if we have the info we need
                if ( ! $this->mTitle ) {
                        throw new MWException( "You must call setTitle() on an HTMLForm" );
                }

                // FIXME shouldn't this be closer to displayForm() ?
                self::addJS();

                # Load data from the request.
                $this->loadData();
        }

        /**
         * Try submitting, with edit token check first
         * @return Status|boolean 
         */
        function tryAuthorizedSubmit() {
                global $wgUser, $wgRequest;
                $editToken = $wgRequest->getVal( 'wpEditToken' );

                $result = false;
                if ( $this->getMethod() != 'post' || $wgUser->matchEditToken( $editToken ) ) {
                        $result = $this->trySubmit();
                }
                return $result;
        }

        /**
         * The here's-one-I-made-earlier option: do the submission if
         * posted, or display the form with or without funky valiation
         * errors
         * @return Bool or Status whether submission was successful.
         */
        function show() {
                $this->prepareForm();

                $result = $this->tryAuthorizedSubmit();
                if ( $result === true || ( $result instanceof Status && $result->isGood() ) ){
                        return $result;
                }

                $this->displayForm( $result );
                return false;
        }

        /**
         * Validate all the fields, and call the submision callback
         * function if everything is kosher.
         * @return Mixed Bool true == Successful submission, Bool false
         *       == No submission attempted, anything else == Error to
         *       display.
         */
        function trySubmit() {
                # Check for validation
                foreach ( $this->mFlatFields as $fieldname => $field ) {
                        if ( !empty( $field->mParams['nodata'] ) ) {
                                continue;
                        }
                        if ( $field->validate(
                                        $this->mFieldData[$fieldname],
                                        $this->mFieldData )
                                !== true
                        ) {
                                return isset( $this->mValidationErrorMessage )
                                        ? $this->mValidationErrorMessage
                                        : array( 'htmlform-invalid-input' );
                        }
                }

                $callback = $this->mSubmitCallback;

                $data = $this->filterDataForSubmit( $this->mFieldData );

                $res = call_user_func( $callback, $data );

                return $res;
        }

        /**
         * Set a callback to a function to do something with the form
         * once it's been successfully validated.
         * @param $cb String function name.  The function will be passed
         *       the output from HTMLForm::filterDataForSubmit, and must
         *       return Bool true on success, Bool false if no submission
         *       was attempted, or String HTML output to display on error.
         */
        function setSubmitCallback( $cb ) {
                $this->mSubmitCallback = $cb;
        }

        /**
         * Set a message to display on a validation error.
         * @param $msg Mixed String or Array of valid inputs to wfMsgExt()
         *       (so each entry can be either a String or Array)
         */
        function setValidationErrorMessage( $msg ) {
                $this->mValidationErrorMessage = $msg;
        }

        /**
         * Set the introductory message, overwriting any existing message.
         * @param $msg String complete text of message to display
         */
        function setIntro( $msg ) { $this->mPre = $msg; }

        /**
         * Add introductory text.
         * @param $msg String complete text of message to display
         */
        function addPreText( $msg ) { $this->mPre .= $msg; }

        /**
         * Add header text, inside the form.
         * @param $msg String complete text of message to display
         */
        function addHeaderText( $msg, $section = null ) { 
                if ( is_null( $section ) ) {
                        $this->mHeader .= $msg; 
                } else {
                        if ( !isset( $this->mSectionHeaders[$section] ) ) {
                                $this->mSectionHeaders[$section] = '';
                        }
                        $this->mSectionHeaders[$section] .= $msg;
                }
        }

        /**
         * Add footer text, inside the form.
         * @param $msg String complete text of message to display
         */
        function addFooterText( $msg, $section = null ) { 
                if ( is_null( $section ) ) {
                        $this->mFooter .= $msg; 
                } else {
                        if ( !isset( $this->mSectionFooters[$section] ) ) {
                                $this->mSectionFooters[$section] = '';
                        }
                        $this->mSectionFooters[$section] .= $msg;                       
                }
        }

        /**
         * Add text to the end of the display.
         * @param $msg String complete text of message to display
         */
        function addPostText( $msg ) { $this->mPost .= $msg; }

        /**
         * Add a hidden field to the output
         * @param $name String field name.  This will be used exactly as entered
         * @param $value String field value
         * @param $attribs Array
         */
        public function addHiddenField( $name, $value, $attribs = array() ) {
                $attribs += array( 'name' => $name );
                $this->mHiddenFields[] = array( $value, $attribs );
        }

        public function addButton( $name, $value, $id = null, $attribs = null ) {
                $this->mButtons[] = compact( 'name', 'value', 'id', 'attribs' );
        }

        /**
         * Display the form (sending to wgOut), with an appropriate error
         * message or stack of messages, and any validation errors, etc.
         * @param $submitResult Mixed output from HTMLForm::trySubmit()
         */
        function displayForm( $submitResult ) {
                global $wgOut;

                # For good measure (it is the default)
                $wgOut->preventClickjacking();

                $html = ''
                        . $this->getErrors( $submitResult )
                        . $this->mHeader
                        . $this->getBody()
                        . $this->getHiddenFields()
                        . $this->getButtons()
                        . $this->mFooter
                ;

                $html = $this->wrapForm( $html );

                $wgOut->addHTML( ''
                        . $this->mPre
                        . $html
                        . $this->mPost
                );
        }

        /**
         * Wrap the form innards in an actual <form> element
         * @param $html String HTML contents to wrap.
         * @return String wrapped HTML.
         */
        function wrapForm( $html ) {

                # Include a <fieldset> wrapper for style, if requested.
                if ( $this->mWrapperLegend !== false ) {
                        $html = Xml::fieldset( $this->mWrapperLegend, $html );
                }
                # Use multipart/form-data
                $encType = $this->mUseMultipart
                        ? 'multipart/form-data'
                        : 'application/x-www-form-urlencoded';
                # Attributes
                $attribs = array(
                        'action'  => $this->getTitle()->getFullURL(),
                        'method'  => $this->mMethod,
                        'class'   => 'visualClear',
                        'enctype' => $encType,
                );
                if ( !empty( $this->mId ) ) {
                        $attribs['id'] = $this->mId;
                }

                return Html::rawElement( 'form', $attribs, $html );
        }

        /**
         * Get the hidden fields that should go inside the form.
         * @return String HTML.
         */
        function getHiddenFields() {
                global $wgUser;

                $html = '';
                
                if( $this->getMethod() == 'post' ){
                        $html .= Html::hidden( 'wpEditToken', $wgUser->editToken(), array( 'id' => 'wpEditToken' ) ) . "\n";
                        $html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
                }

                foreach ( $this->mHiddenFields as $data ) {
                        list( $value, $attribs ) = $data;
                        $html .= Html::hidden( $attribs['name'], $value, $attribs ) . "\n";
                }

                return $html;
        }

        /**
         * Get the submit and (potentially) reset buttons.
         * @return String HTML.
         */
        function getButtons() {
                $html = '';
                $attribs = array();

                if ( isset( $this->mSubmitID ) ) {
                        $attribs['id'] = $this->mSubmitID;
                }

                if ( isset( $this->mSubmitName ) ) {
                        $attribs['name'] = $this->mSubmitName;
                }

                if ( isset( $this->mSubmitTooltip ) ) {
                        global $wgUser;
                        $attribs += $wgUser->getSkin()->tooltipAndAccessKeyAttribs( $this->mSubmitTooltip );
                }

                $attribs['class'] = 'mw-htmlform-submit';

                $html .= Xml::submitButton( $this->getSubmitText(), $attribs ) . "\n";

                if ( $this->mShowReset ) {
                        $html .= Html::element(
                                'input',
                                array(
                                        'type' => 'reset',
                                        'value' => wfMsg( 'htmlform-reset' )
                                )
                        ) . "\n";
                }

                foreach ( $this->mButtons as $button ) {
                        $attrs = array(
                                'type'  => 'submit',
                                'name'  => $button['name'],
                                'value' => $button['value']
                        );

                        if ( $button['attribs'] ) {
                                $attrs += $button['attribs'];
                        }

                        if ( isset( $button['id'] ) ) {
                                $attrs['id'] = $button['id'];
                        }

                        $html .= Html::element( 'input', $attrs );
                }

                return $html;
        }

        /**
         * Get the whole body of the form.
         */
        function getBody() {
                return $this->displaySection( $this->mFieldTree );
        }

        /**
         * Format and display an error message stack.
         * @param $errors Mixed String or Array of message keys
         * @return String
         */
        function getErrors( $errors ) {
                if ( $errors instanceof Status ) {
                        global $wgOut;
                        $errorstr = $wgOut->parse( $errors->getWikiText() );
                } elseif ( is_array( $errors ) ) {
                        $errorstr = $this->formatErrors( $errors );
                } else {
                        $errorstr = $errors;
                }

                return $errorstr
                        ? Html::rawElement( 'div', array( 'class' => 'error' ), $errorstr )
                        : '';
        }

        /**
         * Format a stack of error messages into a single HTML string
         * @param $errors Array of message keys/values
         * @return String HTML, a <ul> list of errors
         */
        static function formatErrors( $errors ) {
                $errorstr = '';

                foreach ( $errors as $error ) {
                        if ( is_array( $error ) ) {
                                $msg = array_shift( $error );
                        } else {
                                $msg = $error;
                                $error = array();
                        }

                        $errorstr .= Html::rawElement(
                                'li',
                                null,
                                wfMsgExt( $msg, array( 'parseinline' ), $error )
                        );
                }

                $errorstr = Html::rawElement( 'ul', array(), $errorstr );

                return $errorstr;
        }

        /**
         * Set the text for the submit button
         * @param $t String plaintext.
         */
        function setSubmitText( $t ) {
                $this->mSubmitText = $t;
        }

        /**
         * Get the text for the submit button, either customised or a default.
         * @return unknown_type
         */
        function getSubmitText() {
                return $this->mSubmitText
                        ? $this->mSubmitText
                        : wfMsg( 'htmlform-submit' );
        }

        public function setSubmitName( $name ) {
                $this->mSubmitName = $name;
        }

        public function setSubmitTooltip( $name ) {
                $this->mSubmitTooltip = $name;
        }

        /**
         * Set the id for the submit button.
         * @param $t String.  FIXME: Integrity is *not* validated
         */
        function setSubmitID( $t ) {
                $this->mSubmitID = $t;
        }

        public function setId( $id ) {
                $this->mId = $id;
        }
        /**
         * Prompt the whole form to be wrapped in a <fieldset>, with
         * this text as its <legend> element.
         * @param $legend String HTML to go inside the <legend> element.
         *       Will be escaped
         */
        public function setWrapperLegend( $legend ) { $this->mWrapperLegend = $legend; }

        /**
         * Set the prefix for various default messages
         * TODO: currently only used for the <fieldset> legend on forms
         * with multiple sections; should be used elsewhre?
         * @param $p String
         */
        function setMessagePrefix( $p ) {
                $this->mMessagePrefix = $p;
        }

        /**
         * Set the title for form submission
         * @param $t Title of page the form is on/should be posted to
         */
        function setTitle( $t ) {
                $this->mTitle = $t;
        }

        /**
         * Get the title
         * @return Title
         */
        function getTitle() {
                return $this->mTitle;
        }
        
        /**
         * Set the method used to submit the form
         * @param $method String
         */
        public function setMethod( $method='post' ){
                $this->mMethod = $method;
        }
        
        public function getMethod(){
                return $this->mMethod;
        }

        /**
         * TODO: Document
         * @param $fields
         */
        function displaySection( $fields, $sectionName = '' ) {
                $tableHtml = '';
                $subsectionHtml = '';
                $hasLeftColumn = false;

                foreach ( $fields as $key => $value ) {
                        if ( is_object( $value ) ) {
                                $v = empty( $value->mParams['nodata'] )
                                        ? $this->mFieldData[$key]
                                        : $value->getDefault();
                                $tableHtml .= $value->getTableRow( $v );

                                if ( $value->getLabel() != '&#160;' )
                                        $hasLeftColumn = true;
                        } elseif ( is_array( $value ) ) {
                                $section = $this->displaySection( $value, $key );
                                $legend = wfMsg( "{$this->mMessagePrefix}-$key" );
                                if ( isset( $this->mSectionHeaders[$key] ) ) {
                                        $section = $this->mSectionHeaders[$key] . $section;
                                } 
                                if ( isset( $this->mSectionFooters[$key] ) ) {
                                        $section .= $this->mSectionFooters[$key];
                                }
                                $subsectionHtml .= Xml::fieldset( $legend, $section ) . "\n";                                   
                        }
                }

                $classes = array();

                if ( !$hasLeftColumn ) { // Avoid strange spacing when no labels exist
                        $classes[] = 'mw-htmlform-nolabel';
                }

                $attribs = array(
                        'class' => implode( ' ', $classes ),
                );

                if ( $sectionName ) {
                        $attribs['id'] = Sanitizer::escapeId( "mw-htmlform-$sectionName" );
                }

                $tableHtml = Html::rawElement( 'table', $attribs,
                        Html::rawElement( 'tbody', array(), "\n$tableHtml\n" ) ) . "\n";

                return $subsectionHtml . "\n" . $tableHtml;
        }

        /**
         * Construct the form fields from the Descriptor array
         */
        function loadData() {
                global $wgRequest;

                $fieldData = array();

                foreach ( $this->mFlatFields as $fieldname => $field ) {
                        if ( !empty( $field->mParams['nodata'] ) ) {
                                continue;
                        } elseif ( !empty( $field->mParams['disabled'] ) ) {
                                $fieldData[$fieldname] = $field->getDefault();
                        } else {
                                $fieldData[$fieldname] = $field->loadDataFromRequest( $wgRequest );
                        }
                }

                # Filter data.
                foreach ( $fieldData as $name => &$value ) {
                        $field = $this->mFlatFields[$name];
                        $value = $field->filter( $value, $this->mFlatFields );
                }

                $this->mFieldData = $fieldData;
        }

        /**
         * Stop a reset button being shown for this form
         * @param $suppressReset Bool set to false to re-enable the
         *       button again
         */
        function suppressReset( $suppressReset = true ) {
                $this->mShowReset = !$suppressReset;
        }

        /**
         * Overload this if you want to apply special filtration routines
         * to the form as a whole, after it's submitted but before it's
         * processed.
         * @param $data
         * @return unknown_type
         */
        function filterDataForSubmit( $data ) {
                return $data;
        }
}

/**
 * The parent class to generate form fields.  Any field type should
 * be a subclass of this.
 */
abstract class HTMLFormField {

        protected $mValidationCallback;
        protected $mFilterCallback;
        protected $mName;
        public $mParams;
        protected $mLabel;      # String label.  Set on construction
        protected $mID;
        protected $mClass = '';
        protected $mDefault;
        public $mParent;

        /**
         * This function must be implemented to return the HTML to generate
         * the input object itself.  It should not implement the surrounding
         * table cells/rows, or labels/help messages.
         * @param $value String the value to set the input to; eg a default
         *       text for a text input.
         * @return String valid HTML.
         */
        abstract function getInputHTML( $value );

        /**
         * Override this function to add specific validation checks on the
         * field input.  Don't forget to call parent::validate() to ensure
         * that the user-defined callback mValidationCallback is still run
         * @param $value String the value the field was submitted with
         * @param $alldata Array the data collected from the form
         * @return Mixed Bool true on success, or String error to display.
         */
        function validate( $value, $alldata ) {
                if ( isset( $this->mValidationCallback ) ) {
                        return call_user_func( $this->mValidationCallback, $value, $alldata );
                }

                if ( isset( $this->mParams['required'] ) && $value === '' ) {
                        return wfMsgExt( 'htmlform-required', 'parseinline' );
                }

                return true;
        }

        function filter( $value, $alldata ) {
                if ( isset( $this->mFilterCallback ) ) {
                        $value = call_user_func( $this->mFilterCallback, $value, $alldata );
                }

                return $value;
        }

        /**
         * Should this field have a label, or is there no input element with the
         * appropriate id for the label to point to?
         *
         * @return bool True to output a label, false to suppress
         */
        protected function needsLabel() {
                return true;
        }

        /**
         * Get the value that this input has been set to from a posted form,
         * or the input's default value if it has not been set.
         * @param $request WebRequest
         * @return String the value
         */
        function loadDataFromRequest( $request ) {
                if ( $request->getCheck( $this->mName ) ) {
                        return $request->getText( $this->mName );
                } else {
                        return $this->getDefault();
                }
        }

        /**
         * Initialise the object
         * @param $params Associative Array. See HTMLForm doc for syntax.
         */
        function __construct( $params ) {
                $this->mParams = $params;

                # Generate the label from a message, if possible
                if ( isset( $params['label-message'] ) ) {
                        $msgInfo = $params['label-message'];

                        if ( is_array( $msgInfo ) ) {
                                $msg = array_shift( $msgInfo );
                        } else {
                                $msg = $msgInfo;
                                $msgInfo = array();
                        }

                        $this->mLabel = wfMsgExt( $msg, 'parseinline', $msgInfo );
                } elseif ( isset( $params['label'] ) ) {
                        $this->mLabel = $params['label'];
                }

                $this->mName = "wp{$params['fieldname']}";
                if ( isset( $params['name'] ) ) {
                        $this->mName = $params['name'];
                }
                
                $validName = Sanitizer::escapeId( $this->mName );
                if ( $this->mName != $validName && !isset( $params['nodata'] ) ) {
                        throw new MWException( "Invalid name '{$this->mName}' passed to " . __METHOD__ );
                }
                
                $this->mID = "mw-input-{$this->mName}";

                if ( isset( $params['default'] ) ) {
                        $this->mDefault = $params['default'];
                }

                if ( isset( $params['id'] ) ) {
                        $id = $params['id'];
                        $validId = Sanitizer::escapeId( $id );

                        if ( $id != $validId ) {
                                throw new MWException( "Invalid id '$id' passed to " . __METHOD__ );
                        }

                        $this->mID = $id;
                }

                if ( isset( $params['cssclass'] ) ) {
                        $this->mClass = $params['cssclass'];
                }

                if ( isset( $params['validation-callback'] ) ) {
                        $this->mValidationCallback = $params['validation-callback'];
                }

                if ( isset( $params['filter-callback'] ) ) {
                        $this->mFilterCallback = $params['filter-callback'];
                }
        }

        /**
         * Get the complete table row for the input, including help text,
         * labels, and whatever.
         * @param $value String the value to set the input to.
         * @return String complete HTML table row.
         */
        function getTableRow( $value ) {
                # Check for invalid data.
                global $wgRequest;

                $errors = $this->validate( $value, $this->mParent->mFieldData );
                
                $cellAttributes = array();
                $verticalLabel = false;
                
                if ( !empty($this->mParams['vertical-label']) ) {
                        $cellAttributes['colspan'] = 2;
                        $verticalLabel = true;
                }

                if ( $errors === true || ( !$wgRequest->wasPosted() && ( $this->mParent->getMethod() == 'post' ) ) ) {
                        $errors = '';
                } else {
                        $errors = Html::rawElement( 'span', array( 'class' => 'error' ), $errors );
                }

                $label = $this->getLabelHtml( $cellAttributes );
                $field = Html::rawElement(
                        'td',
                        array( 'class' => 'mw-input' ) + $cellAttributes,
                        $this->getInputHTML( $value ) . "\n$errors"
                );
                
                $fieldType = get_class( $this );
                
                if ($verticalLabel) {
                        $html = Html::rawElement( 'tr',
                                array( 'class' => 'mw-htmlform-vertical-label' ), $label );
                        $html .= Html::rawElement( 'tr',
                                array( 'class' => "mw-htmlform-field-$fieldType {$this->mClass}" ),
                                $field );
                } else {
                        $html = Html::rawElement( 'tr',
                                array( 'class' => "mw-htmlform-field-$fieldType {$this->mClass}" ),
                                $label . $field );
                }

                $helptext = null;

                if ( isset( $this->mParams['help-message'] ) ) {
                        $msg = $this->mParams['help-message'];
                        $helptext = wfMsgExt( $msg, 'parseinline' );
                        if ( wfEmptyMsg( $msg, $helptext ) ) {
                                # Never mind
                                $helptext = null;
                        }
                } elseif ( isset( $this->mParams['help-messages'] ) ) {
                        # help-message can be passed a message key (string) or an array containing
                        # a message key and additional parameters. This makes it impossible to pass
                        # an array of message key
                        foreach( $this->mParams['help-messages'] as $msg ) {
                                $candidate = wfMsgExt( $msg, 'parseinline' );
                                if( wfEmptyMsg( $msg ) ) {
                                        $candidate = null;
                                }
                                $helptext .= $candidate; // append message
                        }       
                } elseif ( isset( $this->mParams['help'] ) ) {
                        $helptext = $this->mParams['help'];
                }

                if ( !is_null( $helptext ) ) {
                        $row = Html::rawElement( 'td', array( 'colspan' => 2, 'class' => 'htmlform-tip' ),
                                $helptext );
                        $row = Html::rawElement( 'tr', array(), $row );
                        $html .= "$row\n";
                }

                return $html;
        }

        function getLabel() {
                return $this->mLabel;
        }
        function getLabelHtml( $cellAttributes = array() ) {
                # Don't output a for= attribute for labels with no associated input.
                # Kind of hacky here, possibly we don't want these to be <label>s at all.
                $for = array();

                if ( $this->needsLabel() ) {
                        $for['for'] = $this->mID;
                }

                return Html::rawElement( 'td', array( 'class' => 'mw-label' ) + $cellAttributes,
                        Html::rawElement( 'label', $for, $this->getLabel() )
                );
        }

        function getDefault() {
                if ( isset( $this->mDefault ) ) {
                        return $this->mDefault;
                } else {
                        return null;
                }
        }

        /**
         * Returns the attributes required for the tooltip and accesskey.
         *
         * @return array Attributes
         */
        public function getTooltipAndAccessKey() {
                if ( empty( $this->mParams['tooltip'] ) ) {
                        return array();
                }

                global $wgUser;

                return $wgUser->getSkin()->tooltipAndAccessKeyAttribs( $this->mParams['tooltip'] );
        }

        /**
         * flatten an array of options to a single array, for instance,
         * a set of <options> inside <optgroups>.
         * @param $options Associative Array with values either Strings
         *       or Arrays
         * @return Array flattened input
         */
        public static function flattenOptions( $options ) {
                $flatOpts = array();

                foreach ( $options as $value ) {
                        if ( is_array( $value ) ) {
                                $flatOpts = array_merge( $flatOpts, self::flattenOptions( $value ) );
                        } else {
                                $flatOpts[] = $value;
                        }
                }

                return $flatOpts;
        }
}

class HTMLTextField extends HTMLFormField {
        function getSize() {
                return isset( $this->mParams['size'] )
                        ? $this->mParams['size']
                        : 45;
        }

        function getInputHTML( $value ) {
                $attribs = array(
                        'id' => $this->mID,
                        'name' => $this->mName,
                        'size' => $this->getSize(),
                        'value' => $value,
                ) + $this->getTooltipAndAccessKey();

                if ( isset( $this->mParams['maxlength'] ) ) {
                        $attribs['maxlength'] = $this->mParams['maxlength'];
                }

                if ( !empty( $this->mParams['disabled'] ) ) {
                        $attribs['disabled'] = 'disabled';
                }

                # TODO: Enforce pattern, step, required, readonly on the server side as
                # well
                foreach ( array( 'min', 'max', 'pattern', 'title', 'step',
                'placeholder' ) as $param ) {
                        if ( isset( $this->mParams[$param] ) ) {
                                $attribs[$param] = $this->mParams[$param];
                        }
                }

                foreach ( array( 'required', 'autofocus', 'multiple', 'readonly' ) as $param ) {
                        if ( isset( $this->mParams[$param] ) ) {
                                $attribs[$param] = '';
                        }
                }

                # Implement tiny differences between some field variants
                # here, rather than creating a new class for each one which
                # is essentially just a clone of this one.
                if ( isset( $this->mParams['type'] ) ) {
                        switch ( $this->mParams['type'] ) {
                                case 'email':
                                        $attribs['type'] = 'email';
                                        break;
                                case 'int':
                                        $attribs['type'] = 'number';
                                        break;
                                case 'float':
                                        $attribs['type'] = 'number';
                                        $attribs['step'] = 'any';
                                        break;
                                # Pass through
                                case 'password':
                                case 'file':
                                        $attribs['type'] = $this->mParams['type'];
                                        break;
                        }
                }

                return Html::element( 'input', $attribs );
        }
}
class HTMLTextAreaField extends HTMLFormField {
        function getCols() {
                return isset( $this->mParams['cols'] )
                        ? $this->mParams['cols']
                        : 80;
        }

        function getRows() {
                return isset( $this->mParams['rows'] )
                        ? $this->mParams['rows']
                        : 25;
        }

        function getInputHTML( $value ) {
                $attribs = array(
                        'id' => $this->mID,
                        'name' => $this->mName,
                        'cols' => $this->getCols(),
                        'rows' => $this->getRows(),
                ) + $this->getTooltipAndAccessKey();


                if ( !empty( $this->mParams['disabled'] ) ) {
                        $attribs['disabled'] = 'disabled';
                }

                if ( !empty( $this->mParams['readonly'] ) ) {
                        $attribs['readonly'] = 'readonly';
                }

                foreach ( array( 'required', 'autofocus' ) as $param ) {
                        if ( isset( $this->mParams[$param] ) ) {
                                $attribs[$param] = '';
                        }
                }

                return Html::element( 'textarea', $attribs, $value );
        }
}

/**
 * A field that will contain a numeric value
 */
class HTMLFloatField extends HTMLTextField {
        function getSize() {
                return isset( $this->mParams['size'] )
                        ? $this->mParams['size']
                        : 20;
        }

        function validate( $value, $alldata ) {
                $p = parent::validate( $value, $alldata );

                if ( $p !== true ) {
                        return $p;
                }
                
                $value = trim( $value );

                # http://dev.w3.org/html5/spec/common-microsyntaxes.html#real-numbers
                # with the addition that a leading '+' sign is ok. 
                if ( !preg_match( '/^((\+|\-)?\d+(\.\d+)?(E(\+|\-)?\d+)?)?$/i', $value ) ) {
                        return wfMsgExt( 'htmlform-float-invalid', 'parse' );
                }

                # The "int" part of these message names is rather confusing.
                # They make equal sense for all numbers.
                if ( isset( $this->mParams['min'] ) ) {
                        $min = $this->mParams['min'];

                        if ( $min > $value ) {
                                return wfMsgExt( 'htmlform-int-toolow', 'parse', array( $min ) );
                        }
                }

                if ( isset( $this->mParams['max'] ) ) {
                        $max = $this->mParams['max'];

                        if ( $max < $value ) {
                                return wfMsgExt( 'htmlform-int-toohigh', 'parse', array( $max ) );
                        }
                }

                return true;
        }
}

/**
 * A field that must contain a number
 */
class HTMLIntField extends HTMLFloatField {
        function validate( $value, $alldata ) {
                $p = parent::validate( $value, $alldata );

                if ( $p !== true ) {
                        return $p;
                }

                # http://dev.w3.org/html5/spec/common-microsyntaxes.html#signed-integers
                # with the addition that a leading '+' sign is ok. Note that leading zeros 
                # are fine, and will be left in the input, which is useful for things like 
                # phone numbers when you know that they are integers (the HTML5 type=tel
                # input does not require its value to be numeric).  If you want a tidier
                # value to, eg, save in the DB, clean it up with intval().
                if ( !preg_match( '/^((\+|\-)?\d+)?$/', trim( $value ) )
                ) {
                        return wfMsgExt( 'htmlform-int-invalid', 'parse' );
                }

                return true;
        }
}

/**
 * A checkbox field
 */
class HTMLCheckField extends HTMLFormField {
        function getInputHTML( $value ) {
                if ( !empty( $this->mParams['invert'] ) ) {
                        $value = !$value;
                }

                $attr = $this->getTooltipAndAccessKey();
                $attr['id'] = $this->mID;

                if ( !empty( $this->mParams['disabled'] ) ) {
                        $attr['disabled'] = 'disabled';
                }

                return Xml::check( $this->mName, $value, $attr ) . '&#160;' .
                        Html::rawElement( 'label', array( 'for' => $this->mID ), $this->mLabel );
        }

        /**
         * For a checkbox, the label goes on the right hand side, and is
         * added in getInputHTML(), rather than HTMLFormField::getRow()
         */
        function getLabel() {
                return '&#160;';
        }

        function loadDataFromRequest( $request ) {
                $invert = false;
                if ( isset( $this->mParams['invert'] ) && $this->mParams['invert'] ) {
                        $invert = true;
                }

                // GetCheck won't work like we want for checks.
                if ( $request->getCheck( 'wpEditToken' ) ) {
                        // XOR has the following truth table, which is what we want
                        // INVERT VALUE | OUTPUT
                        // true   true  | false
                        // false  true  | true
                        // false  false | false
                        // true   false | true
                        return $request->getBool( $this->mName ) xor $invert;
                } else {
                        return $this->getDefault();
                }
        }
}

/**
 * A select dropdown field.  Basically a wrapper for Xmlselect class
 */
class HTMLSelectField extends HTMLFormField {
        function validate( $value, $alldata ) {
                $p = parent::validate( $value, $alldata );

                if ( $p !== true ) {
                        return $p;
                }

                $validOptions = HTMLFormField::flattenOptions( $this->mParams['options'] );

                if ( in_array( $value, $validOptions ) )
                        return true;
                else
                        return wfMsgExt( 'htmlform-select-badoption', 'parseinline' );
        }

        function getInputHTML( $value ) {
                $select = new XmlSelect( $this->mName, $this->mID, strval( $value ) );

                # If one of the options' 'name' is int(0), it is automatically selected.
                # because PHP sucks and things int(0) == 'some string'.
                # Working around this by forcing all of them to strings.
                foreach( $this->mParams['options'] as $key => &$opt ){
                        if( is_int( $opt ) ){
                                $opt = strval( $opt );
                        }
                }
                unset( $opt ); # PHP keeps $opt around as a reference, which is a bit scary

                if ( !empty( $this->mParams['disabled'] ) ) {
                        $select->setAttribute( 'disabled', 'disabled' );
                }

                $select->addOptions( $this->mParams['options'] );

                return $select->getHTML();
        }
}

/**
 * Select dropdown field, with an additional "other" textbox.
 */
class HTMLSelectOrOtherField extends HTMLTextField {
        static $jsAdded = false;

        function __construct( $params ) {
                if ( !in_array( 'other', $params['options'], true ) ) {
                        $params['options'][wfMsg( 'htmlform-selectorother-other' )] = 'other';
                }

                parent::__construct( $params );
        }

        static function forceToStringRecursive( $array ) {
                if ( is_array( $array ) ) {
                        return array_map( array( __CLASS__, 'forceToStringRecursive' ), $array );
                } else {
                        return strval( $array );
                }
        }

        function getInputHTML( $value ) {
                $valInSelect = false;

                if ( $value !== false ) {
                        $valInSelect = in_array(
                                $value,
                                HTMLFormField::flattenOptions( $this->mParams['options'] )
                        );
                }

                $selected = $valInSelect ? $value : 'other';

                $opts = self::forceToStringRecursive( $this->mParams['options'] );

                $select = new XmlSelect( $this->mName, $this->mID, $selected );
                $select->addOptions( $opts );

                $select->setAttribute( 'class', 'mw-htmlform-select-or-other' );

                $tbAttribs = array( 'id' => $this->mID . '-other', 'size' => $this->getSize() );

                if ( !empty( $this->mParams['disabled'] ) ) {
                        $select->setAttribute( 'disabled', 'disabled' );
                        $tbAttribs['disabled'] = 'disabled';
                }

                $select = $select->getHTML();

                if ( isset( $this->mParams['maxlength'] ) ) {
                        $tbAttribs['maxlength'] = $this->mParams['maxlength'];
                }

                $textbox = Html::input(
                        $this->mName . '-other',
                        $valInSelect ? '' : $value,
                        'text',
                        $tbAttribs
                );

                return "$select<br />\n$textbox";
        }

        function loadDataFromRequest( $request ) {
                if ( $request->getCheck( $this->mName ) ) {
                        $val = $request->getText( $this->mName );

                        if ( $val == 'other' ) {
                                $val = $request->getText( $this->mName . '-other' );
                        }

                        return $val;
                } else {
                        return $this->getDefault();
                }
        }
}

/**
 * Multi-select field
 */
class HTMLMultiSelectField extends HTMLFormField {
        function validate( $value, $alldata ) {
                $p = parent::validate( $value, $alldata );

                if ( $p !== true ) {
                        return $p;
                }

                if ( !is_array( $value ) ) {
                        return false;
                }

                # If all options are valid, array_intersect of the valid options
                # and the provided options will return the provided options.
                $validOptions = HTMLFormField::flattenOptions( $this->mParams['options'] );

                $validValues = array_intersect( $value, $validOptions );
                if ( count( $validValues ) == count( $value ) ) {
                        return true;
                } else {
                        return wfMsgExt( 'htmlform-select-badoption', 'parseinline' );
                }
        }

        function getInputHTML( $value ) {
                $html = $this->formatOptions( $this->mParams['options'], $value );

                return $html;
        }

        function formatOptions( $options, $value ) {
                $html = '';

                $attribs = array();

                if ( !empty( $this->mParams['disabled'] ) ) {
                        $attribs['disabled'] = 'disabled';
                }

                foreach ( $options as $label => $info ) {
                        if ( is_array( $info ) ) {
                                $html .= Html::rawElement( 'h1', array(), $label ) . "\n";
                                $html .= $this->formatOptions( $info, $value );
                        } else {
                                $thisAttribs = array( 'id' => "{$this->mID}-$info", 'value' => $info );

                                $checkbox = Xml::check( 
                                        $this->mName . '[]', 
                                        in_array( $info, $value, true ),
                                        $attribs + $thisAttribs );
                                $checkbox .= '&#160;' . Html::rawElement( 'label', array( 'for' => "{$this->mID}-$info" ), $label );

                                $html .= $checkbox . '<br />';
                        }
                }

                return $html;
        }

        function loadDataFromRequest( $request ) {
                # won't work with getCheck
                if ( $request->getCheck( 'wpEditToken' ) ) {
                        $arr = $request->getArray( $this->mName );

                        if ( !$arr ) {
                                $arr = array();
                        }

                        return $arr;
                } else {
                        return $this->getDefault();
                }
        }

        function getDefault() {
                if ( isset( $this->mDefault ) ) {
                        return $this->mDefault;
                } else {
                        return array();
                }
        }

        protected function needsLabel() {
                return false;
        }
}

/**
 * Radio checkbox fields.
 */
class HTMLRadioField extends HTMLFormField {
        function validate( $value, $alldata ) {
                $p = parent::validate( $value, $alldata );

                if ( $p !== true ) {
                        return $p;
                }

                if ( !is_string( $value ) && !is_int( $value ) ) {
                        return false;
                }

                $validOptions = HTMLFormField::flattenOptions( $this->mParams['options'] );

                if ( in_array( $value, $validOptions ) ) {
                        return true;
                } else {
                        return wfMsgExt( 'htmlform-select-badoption', 'parseinline' );
                }
        }

        /**
         * This returns a block of all the radio options, in one cell.
         * @see includes/HTMLFormField#getInputHTML()
         */
        function getInputHTML( $value ) {
                $html = $this->formatOptions( $this->mParams['options'], $value );

                return $html;
        }

        function formatOptions( $options, $value ) {
                $html = '';

                $attribs = array();
                if ( !empty( $this->mParams['disabled'] ) ) {
                        $attribs['disabled'] = 'disabled';
                }

                # TODO: should this produce an unordered list perhaps?
                foreach ( $options as $label => $info ) {
                        if ( is_array( $info ) ) {
                                $html .= Html::rawElement( 'h1', array(), $label ) . "\n";
                                $html .= $this->formatOptions( $info, $value );
                        } else {
                                $id = Sanitizer::escapeId( $this->mID . "-$info" );
                                $html .= Xml::radio(
                                        $this->mName,
                                        $info,
                                        $info == $value,
                                        $attribs + array( 'id' => $id )
                                );
                                $html .= '&#160;' .
                                                Html::rawElement( 'label', array( 'for' => $id ), $label );

                                $html .= "<br />\n";
                        }
                }

                return $html;
        }

        protected function needsLabel() {
                return false;
        }
}

/**
 * An information field (text blob), not a proper input.
 */
class HTMLInfoField extends HTMLFormField {
        function __construct( $info ) {
                $info['nodata'] = true;

                parent::__construct( $info );
        }

        function getInputHTML( $value ) {
                return !empty( $this->mParams['raw'] ) ? $value : htmlspecialchars( $value );
        }

        function getTableRow( $value ) {
                if ( !empty( $this->mParams['rawrow'] ) ) {
                        return $value;
                }

                return parent::getTableRow( $value );
        }

        protected function needsLabel() {
                return false;
        }
}

class HTMLHiddenField extends HTMLFormField {
        public function __construct( $params ) {
                parent::__construct( $params );
                
                # Per HTML5 spec, hidden fields cannot be 'required'
                # http://dev.w3.org/html5/spec/states-of-the-type-attribute.html#hidden-state
                unset( $this->mParams['required'] );
        }

        public function getTableRow( $value ) {
                $params = array();
                if ( $this->mID ) {
                        $params['id'] = $this->mID;
                }

                $this->mParent->addHiddenField(
                        $this->mName,
                        $this->mDefault,
                        $params
                );

                return '';
        }

        public function getInputHTML( $value ) { return ''; }
}

/**
 * Add a submit button inline in the form (as opposed to
 * HTMLForm::addButton(), which will add it at the end).
 */
class HTMLSubmitField extends HTMLFormField {

        function __construct( $info ) {
                $info['nodata'] = true;
                parent::__construct( $info );
        }

        function getInputHTML( $value ) {
                return Xml::submitButton(
                        $value,
                        array(
                                'class' => 'mw-htmlform-submit',
                                'name' => $this->mName,
                                'id' => $this->mID,
                        )
                );
        }

        protected function needsLabel() {
                return false;
        }
        
        /**
         * Button cannot be invalid
         */
        public function validate( $value, $alldata ){
                return true;
        }
}

class HTMLEditTools extends HTMLFormField {
        public function getInputHTML( $value ) {
                return '';
        }

        public function getTableRow( $value ) {
                return "<tr><td></td><td class=\"mw-input\">"
                        . '<div class="mw-editTools">'
                        . wfMsgExt( empty( $this->mParams['message'] )
                                ? 'edittools' : $this->mParams['message'],
                                array( 'parse', 'content' ) )
                        . "</div></td></tr>\n";
        }
}