Merge branch 'archwiki'

# Conflicts:
#	skins/ArchLinux.php
#	skins/ArchLinux/archlogo.gif

24 files changed, 4149 insertions, 0 deletions

diff --git a/includes/htmlform/HTMLApiField.php b/includes/htmlform/HTMLApiField.php
new file mode 100644
index 00000000..f988e622
--- /dev/null
+++ b/includes/htmlform/HTMLApiField.php
@@ -0,0 +1,19 @@
+<?php
+
+class HTMLApiField extends HTMLFormField {
+	public function getTableRow( $value ) {
+		return '';
+	}
+
+	public function getDiv( $value ) {
+		return $this->getTableRow( $value );
+	}
+
+	public function getRaw( $value ) {
+		return $this->getTableRow( $value );
+	}
+
+	public function getInputHTML( $value ) {
+		return '';
+	}
+}
diff --git a/includes/htmlform/HTMLAutoCompleteSelectField.php b/includes/htmlform/HTMLAutoCompleteSelectField.php
new file mode 100644
index 00000000..49053628
--- /dev/null
+++ b/includes/htmlform/HTMLAutoCompleteSelectField.php
@@ -0,0 +1,165 @@
+<?php
+
+/**
+ * Text field for selecting a value from a large list of possible values, with
+ * auto-completion and optionally with a select dropdown for selecting common
+ * options.
+ *
+ * If one of 'options-messages', 'options', or 'options-message' is provided
+ * and non-empty, the select dropdown will be shown. An 'other' key will be
+ * appended using message 'htmlform-selectorother-other' if not already
+ * present.
+ *
+ * Besides the parameters recognized by HTMLTextField, the following are
+ * recognized:
+ *   options-messages - As for HTMLSelectField
+ *   options - As for HTMLSelectField
+ *   options-message - As for HTMLSelectField
+ *   autocomplete - Associative array mapping display text to values.
+ *   autocomplete-messages - Like autocomplete, but keys are message names.
+ *   require-match - Boolean, if true the value must be in the options or the
+ *     autocomplete.
+ *   other-message - Message to use instead of htmlform-selectorother-other for
+ *      the 'other' message.
+ *   other - Raw text to use for the 'other' message
+ *
+ */
+class HTMLAutoCompleteSelectField extends HTMLTextField {
+	protected $autocomplete = array();
+
+	function __construct( $params ) {
+		$params += array(
+			'require-match' => false,
+		);
+
+		parent::__construct( $params );
+
+		if ( array_key_exists( 'autocomplete-messages', $this->mParams ) ) {
+			foreach ( $this->mParams['autocomplete-messages'] as $key => $value ) {
+				$key = $this->msg( $key )->plain();
+				$this->autocomplete[$key] = strval( $value );
+			}
+		} elseif ( array_key_exists( 'autocomplete', $this->mParams ) ) {
+			foreach ( $this->mParams['autocomplete'] as $key => $value ) {
+				$this->autocomplete[$key] = strval( $value );
+			}
+		}
+		if ( !is_array( $this->autocomplete ) || !$this->autocomplete ) {
+			throw new MWException( 'HTMLAutoCompleteSelectField called without any autocompletions' );
+		}
+
+		$this->getOptions();
+		if ( $this->mOptions && !in_array( 'other', $this->mOptions, true ) ) {
+			if ( isset( $params['other-message'] ) ) {
+				$msg = wfMessage( $params['other-message'] )->text();
+			} elseif ( isset( $params['other'] ) ) {
+				$msg = $params['other'];
+			} else {
+				$msg = wfMessage( 'htmlform-selectorother-other' )->text();
+			}
+			$this->mOptions[$msg] = 'other';
+		}
+	}
+
+	function loadDataFromRequest( $request ) {
+		if ( $request->getCheck( $this->mName ) ) {
+			$val = $request->getText( $this->mName . '-select', 'other' );
+
+			if ( $val === 'other' ) {
+				$val = $request->getText( $this->mName );
+				if ( isset( $this->autocomplete[$val] ) ) {
+					$val = $this->autocomplete[$val];
+				}
+			}
+
+			return $val;
+		} else {
+			return $this->getDefault();
+		}
+	}
+
+	function validate( $value, $alldata ) {
+		$p = parent::validate( $value, $alldata );
+
+		if ( $p !== true ) {
+			return $p;
+		}
+
+		$validOptions = HTMLFormField::flattenOptions( $this->getOptions() );
+
+		if ( in_array( strval( $value ), $validOptions, true ) ) {
+			return true;
+		} elseif ( in_array( strval( $value ), $this->autocomplete, true ) ) {
+			return true;
+		} elseif ( $this->mParams['require-match'] ) {
+			return $this->msg( 'htmlform-select-badoption' )->parse();
+		}
+
+		return true;
+	}
+
+	function getAttributes( array $list ) {
+		$attribs = array(
+			'type' => 'text',
+			'data-autocomplete' => FormatJson::encode( array_keys( $this->autocomplete ) ),
+		) + parent::getAttributes( $list );
+
+		if ( $this->getOptions() ) {
+			$attribs['data-hide-if'] = FormatJson::encode(
+				array( '!==', $this->mName . '-select', 'other' )
+			);
+		}
+
+		return $attribs;
+	}
+
+	function getInputHTML( $value ) {
+		$oldClass = $this->mClass;
+		$this->mClass = (array)$this->mClass;
+
+		$valInSelect = false;
+		$ret = '';
+
+		if ( $this->getOptions() ) {
+			if ( $value !== false ) {
+				$value = strval( $value );
+				$valInSelect = in_array(
+					$value, HTMLFormField::flattenOptions( $this->getOptions() ), true
+				);
+			}
+
+			$selected = $valInSelect ? $value : 'other';
+			$select = new XmlSelect( $this->mName . '-select', $this->mID . '-select', $selected );
+			$select->addOptions( $this->getOptions() );
+			$select->setAttribute( 'class', 'mw-htmlform-select-or-other' );
+
+			if ( !empty( $this->mParams['disabled'] ) ) {
+				$select->setAttribute( 'disabled', 'disabled' );
+			}
+
+			if ( isset( $this->mParams['tabindex'] ) ) {
+				$select->setAttribute( 'tabindex', $this->mParams['tabindex'] );
+			}
+
+			$ret = $select->getHTML() . "<br />\n";
+
+			$this->mClass[] = 'mw-htmlform-hide-if';
+		}
+
+		if ( $valInSelect ) {
+			$value = '';
+		} else {
+			$key = array_search( strval( $value ), $this->autocomplete, true );
+			if ( $key !== false ) {
+				$value = $key;
+			}
+		}
+
+		$this->mClass[] = 'mw-htmlform-autocomplete';
+		$ret .= parent::getInputHTML( $valInSelect ? '' : $value );
+		$this->mClass = $oldClass;
+
+		return $ret;
+	}
+
+}
diff --git a/includes/htmlform/HTMLButtonField.php b/includes/htmlform/HTMLButtonField.php
new file mode 100644
index 00000000..09c0ad97
--- /dev/null
+++ b/includes/htmlform/HTMLButtonField.php
@@ -0,0 +1,42 @@
+<?php
+
+/**
+ * Adds a generic button inline to the form. Does not do anything, you must add
+ * click handling code in JavaScript. Use a HTMLSubmitField if you merely
+ * wish to add a submit button to a form.
+ *
+ * @since 1.22
+ */
+class HTMLButtonField extends HTMLFormField {
+	protected $buttonType = 'button';
+
+	public function __construct( $info ) {
+		$info['nodata'] = true;
+		parent::__construct( $info );
+	}
+
+	public function getInputHTML( $value ) {
+		$attr = array(
+			'class' => 'mw-htmlform-submit ' . $this->mClass,
+			'id' => $this->mID,
+		) + $this->getAttributes( array( 'disabled', 'tabindex' ) );
+
+		return Html::input( $this->mName, $value, $this->buttonType, $attr );
+	}
+
+	protected function needsLabel() {
+		return false;
+	}
+
+	/**
+	 * Button cannot be invalid
+	 *
+	 * @param string $value
+	 * @param array $alldata
+	 *
+	 * @return bool
+	 */
+	public function validate( $value, $alldata ) {
+		return true;
+	}
+}
diff --git a/includes/htmlform/HTMLCheckField.php b/includes/htmlform/HTMLCheckField.php
new file mode 100644
index 00000000..5f70362a
--- /dev/null
+++ b/includes/htmlform/HTMLCheckField.php
@@ -0,0 +1,91 @@
+<?php
+
+/**
+ * A checkbox field
+ */
+class HTMLCheckField extends HTMLFormField {
+	function getInputHTML( $value ) {
+		global $wgUseMediaWikiUIEverywhere;
+
+		if ( !empty( $this->mParams['invert'] ) ) {
+			$value = !$value;
+		}
+
+		$attr = $this->getTooltipAndAccessKey();
+		$attr['id'] = $this->mID;
+
+		$attr += $this->getAttributes( array( 'disabled', 'tabindex' ) );
+
+		if ( $this->mClass !== '' ) {
+			$attr['class'] = $this->mClass;
+		}
+
+		if ( $this->mParent->isVForm() ) {
+			// Nest checkbox inside label.
+			return Html::rawElement( 'label',
+				array(
+					'class' => 'mw-ui-checkbox-label'
+				),
+				Xml::check( $this->mName, $value, $attr ) . $this->mLabel );
+		} else {
+			$chkLabel = Xml::check( $this->mName, $value, $attr )
+			. '&#160;'
+			. Html::rawElement( 'label', array( 'for' => $this->mID ), $this->mLabel );
+
+			if ( $wgUseMediaWikiUIEverywhere ) {
+				$chkLabel = Html::rawElement(
+					'div',
+					array( 'class' => 'mw-ui-checkbox' ),
+					$chkLabel
+				);
+			}
+
+			return $chkLabel;
+		}
+	}
+
+	/**
+	 * For a checkbox, the label goes on the right hand side, and is
+	 * added in getInputHTML(), rather than HTMLFormField::getRow()
+	 * @return string
+	 */
+	function getLabel() {
+		return '&#160;';
+	}
+
+	/**
+	 * checkboxes don't need a label.
+	 * @return bool
+	 */
+	protected function needsLabel() {
+		return false;
+	}
+
+	/**
+	 * @param WebRequest $request
+	 *
+	 * @return string
+	 */
+	function loadDataFromRequest( $request ) {
+		$invert = false;
+		if ( isset( $this->mParams['invert'] ) && $this->mParams['invert'] ) {
+			$invert = true;
+		}
+
+		// GetCheck won't work like we want for checks.
+		// Fetch the value in either one of the two following case:
+		// - we have a valid token (form got posted or GET forged by the user)
+		// - checkbox name has a value (false or true), ie is not null
+		if ( $request->getCheck( 'wpEditToken' ) || $request->getVal( $this->mName ) !== null ) {
+			// 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();
+		}
+	}
+}
diff --git a/includes/htmlform/HTMLCheckMatrix.php b/includes/htmlform/HTMLCheckMatrix.php
new file mode 100644
index 00000000..6c538fdd
--- /dev/null
+++ b/includes/htmlform/HTMLCheckMatrix.php
@@ -0,0 +1,250 @@
+<?php
+
+/**
+ * A checkbox matrix
+ * Operates similarly to HTMLMultiSelectField, but instead of using an array of
+ * options, uses an array of rows and an array of columns to dynamically
+ * construct a matrix of options. The tags used to identify a particular cell
+ * are of the form "columnName-rowName"
+ *
+ * Options:
+ *   - columns
+ *     - Required list of columns in the matrix.
+ *   - rows
+ *     - Required list of rows in the matrix.
+ *   - force-options-on
+ *     - Accepts array of column-row tags to be displayed as enabled but unavailable to change
+ *   - force-options-off
+ *     - Accepts array of column-row tags to be displayed as disabled but unavailable to change.
+ *   - tooltips
+ *     - Optional array mapping row label to tooltip content
+ *   - tooltip-class
+ *     - Optional CSS class used on tooltip container span. Defaults to mw-icon-question.
+ */
+class HTMLCheckMatrix extends HTMLFormField implements HTMLNestedFilterable {
+	static private $requiredParams = array(
+		// Required by underlying HTMLFormField
+		'fieldname',
+		// Required by HTMLCheckMatrix
+		'rows',
+		'columns'
+	);
+
+	public function __construct( $params ) {
+		$missing = array_diff( self::$requiredParams, array_keys( $params ) );
+		if ( $missing ) {
+			throw new HTMLFormFieldRequiredOptionsException( $this, $missing );
+		}
+		parent::__construct( $params );
+	}
+
+	function validate( $value, $alldata ) {
+		$rows = $this->mParams['rows'];
+		$columns = $this->mParams['columns'];
+
+		// Make sure user-defined validation callback is run
+		$p = parent::validate( $value, $alldata );
+		if ( $p !== true ) {
+			return $p;
+		}
+
+		// Make sure submitted value is an array
+		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 = array();
+		foreach ( $rows as $rowTag ) {
+			foreach ( $columns as $columnTag ) {
+				$validOptions[] = $columnTag . '-' . $rowTag;
+			}
+		}
+		$validValues = array_intersect( $value, $validOptions );
+		if ( count( $validValues ) == count( $value ) ) {
+			return true;
+		} else {
+			return $this->msg( 'htmlform-select-badoption' )->parse();
+		}
+	}
+
+	/**
+	 * Build a table containing a matrix of checkbox options.
+	 * The value of each option is a combination of the row tag and column tag.
+	 * mParams['rows'] is an array with row labels as keys and row tags as values.
+	 * mParams['columns'] is an array with column labels as keys and column tags as values.
+	 *
+	 * @param array $value Array of the options that should be checked
+	 *
+	 * @return string
+	 */
+	function getInputHTML( $value ) {
+		$html = '';
+		$tableContents = '';
+		$rows = $this->mParams['rows'];
+		$columns = $this->mParams['columns'];
+
+		$attribs = $this->getAttributes( array( 'disabled', 'tabindex' ) );
+
+		// Build the column headers
+		$headerContents = Html::rawElement( 'td', array(), '&#160;' );
+		foreach ( $columns as $columnLabel => $columnTag ) {
+			$headerContents .= Html::rawElement( 'td', array(), $columnLabel );
+		}
+		$tableContents .= Html::rawElement( 'tr', array(), "\n$headerContents\n" );
+
+		$tooltipClass = 'mw-icon-question';
+		if ( isset( $this->mParams['tooltip-class'] ) ) {
+			$tooltipClass = $this->mParams['tooltip-class'];
+		}
+
+		// Build the options matrix
+		foreach ( $rows as $rowLabel => $rowTag ) {
+			// Append tooltip if configured
+			if ( isset( $this->mParams['tooltips'][$rowLabel] ) ) {
+				$tooltipAttribs = array(
+					'class' => "mw-htmlform-tooltip $tooltipClass",
+					'title' => $this->mParams['tooltips'][$rowLabel],
+				);
+				$rowLabel .= ' ' . Html::element( 'span', $tooltipAttribs, '' );
+			}
+			$rowContents = Html::rawElement( 'td', array(), $rowLabel );
+			foreach ( $columns as $columnTag ) {
+				$thisTag = "$columnTag-$rowTag";
+				// Construct the checkbox
+				$thisId = "{$this->mID}-$thisTag";
+				$thisAttribs = array(
+					'id' => $thisId,
+					'value' => $thisTag,
+				);
+				$checked = in_array( $thisTag, (array)$value, true );
+				if ( $this->isTagForcedOff( $thisTag ) ) {
+					$checked = false;
+					$thisAttribs['disabled'] = 1;
+				} elseif ( $this->isTagForcedOn( $thisTag ) ) {
+					$checked = true;
+					$thisAttribs['disabled'] = 1;
+				}
+				$chkBox = Xml::check( "{$this->mName}[]", $checked, $attribs + $thisAttribs );
+				if ( $this->mParent->getConfig()->get( 'UseMediaWikiUIEverywhere' ) ) {
+					$chkBox = Html::openElement( 'div', array( 'class' => 'mw-ui-checkbox' ) ) .
+						$chkBox .
+						Html::element( 'label', array( 'for' => $thisId ) ) .
+						Html::closeElement( 'div' );
+				}
+				$rowContents .= Html::rawElement(
+					'td',
+					array(),
+					$chkBox
+				);
+			}
+			$tableContents .= Html::rawElement( 'tr', array(), "\n$rowContents\n" );
+		}
+
+		// Put it all in a table
+		$html .= Html::rawElement( 'table',
+				array( 'class' => 'mw-htmlform-matrix' ),
+				Html::rawElement( 'tbody', array(), "\n$tableContents\n" ) ) . "\n";
+
+		return $html;
+	}
+
+	protected function isTagForcedOff( $tag ) {
+		return isset( $this->mParams['force-options-off'] )
+			&& in_array( $tag, $this->mParams['force-options-off'] );
+	}
+
+	protected function isTagForcedOn( $tag ) {
+		return isset( $this->mParams['force-options-on'] )
+			&& in_array( $tag, $this->mParams['force-options-on'] );
+	}
+
+	/**
+	 * Get the complete table row for the input, including help text,
+	 * labels, and whatever.
+	 * We override this function since the label should always be on a separate
+	 * line above the options in the case of a checkbox matrix, i.e. it's always
+	 * a "vertical-label".
+	 *
+	 * @param string $value The value to set the input to
+	 *
+	 * @return string Complete HTML table row
+	 */
+	function getTableRow( $value ) {
+		list( $errors, $errorClass ) = $this->getErrorsAndErrorClass( $value );
+		$inputHtml = $this->getInputHTML( $value );
+		$fieldType = get_class( $this );
+		$helptext = $this->getHelpTextHtmlTable( $this->getHelpText() );
+		$cellAttributes = array( 'colspan' => 2 );
+
+		$label = $this->getLabelHtml( $cellAttributes );
+
+		$field = Html::rawElement(
+			'td',
+			array( 'class' => 'mw-input' ) + $cellAttributes,
+			$inputHtml . "\n$errors"
+		);
+
+		$html = Html::rawElement( 'tr', array( 'class' => 'mw-htmlform-vertical-label' ), $label );
+		$html .= Html::rawElement( 'tr',
+			array( 'class' => "mw-htmlform-field-$fieldType {$this->mClass} $errorClass" ),
+			$field );
+
+		return $html . $helptext;
+	}
+
+	/**
+	 * @param WebRequest $request
+	 *
+	 * @return array
+	 */
+	function loadDataFromRequest( $request ) {
+		if ( $this->mParent->getMethod() == 'post' ) {
+			if ( $request->wasPosted() ) {
+				// Checkboxes are not added to the request arrays if they're not checked,
+				// so it's perfectly possible for there not to be an entry at all
+				return $request->getArray( $this->mName, array() );
+			} else {
+				// That's ok, the user has not yet submitted the form, so show the defaults
+				return $this->getDefault();
+			}
+		} else {
+			// This is the impossible case: if we look at $_GET and see no data for our
+			// field, is it because the user has not yet submitted the form, or that they
+			// have submitted it with all the options unchecked. We will have to assume the
+			// latter, which basically means that you can't specify 'positive' defaults
+			// for GET forms.
+			return $request->getArray( $this->mName, array() );
+		}
+	}
+
+	function getDefault() {
+		if ( isset( $this->mDefault ) ) {
+			return $this->mDefault;
+		} else {
+			return array();
+		}
+	}
+
+	function filterDataForSubmit( $data ) {
+		$columns = HTMLFormField::flattenOptions( $this->mParams['columns'] );
+		$rows = HTMLFormField::flattenOptions( $this->mParams['rows'] );
+		$res = array();
+		foreach ( $columns as $column ) {
+			foreach ( $rows as $row ) {
+				// Make sure option hasn't been forced
+				$thisTag = "$column-$row";
+				if ( $this->isTagForcedOff( $thisTag ) ) {
+					$res[$thisTag] = false;
+				} elseif ( $this->isTagForcedOn( $thisTag ) ) {
+					$res[$thisTag] = true;
+				} else {
+					$res[$thisTag] = in_array( $thisTag, $data );
+				}
+			}
+		}
+
+		return $res;
+	}
+}
diff --git a/includes/htmlform/HTMLEditTools.php b/includes/htmlform/HTMLEditTools.php
new file mode 100644
index 00000000..77924ef2
--- /dev/null
+++ b/includes/htmlform/HTMLEditTools.php
@@ -0,0 +1,51 @@
+<?php
+
+class HTMLEditTools extends HTMLFormField {
+	public function getInputHTML( $value ) {
+		return '';
+	}
+
+	public function getTableRow( $value ) {
+		$msg = $this->formatMsg();
+
+		return
+			'<tr><td></td><td class="mw-input">' .
+			'<div class="mw-editTools">' .
+			$msg->parseAsBlock() .
+			"</div></td></tr>\n";
+	}
+
+	/**
+	 * @param string $value
+	 * @return string
+	 * @since 1.20
+	 */
+	public function getDiv( $value ) {
+		$msg = $this->formatMsg();
+
+		return '<div class="mw-editTools">' . $msg->parseAsBlock() . '</div>';
+	}
+
+	/**
+	 * @param string $value
+	 * @return string
+	 * @since 1.20
+	 */
+	public function getRaw( $value ) {
+		return $this->getDiv( $value );
+	}
+
+	protected function formatMsg() {
+		if ( empty( $this->mParams['message'] ) ) {
+			$msg = $this->msg( 'edittools' );
+		} else {
+			$msg = $this->msg( $this->mParams['message'] );
+			if ( $msg->isDisabled() ) {
+				$msg = $this->msg( 'edittools' );
+			}
+		}
+		$msg->inContentLanguage();
+
+		return $msg;
+	}
+}
diff --git a/includes/htmlform/HTMLFloatField.php b/includes/htmlform/HTMLFloatField.php
new file mode 100644
index 00000000..3b38fbe8
--- /dev/null
+++ b/includes/htmlform/HTMLFloatField.php
@@ -0,0 +1,46 @@
+<?php
+
+/**
+ * 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 $this->msg( 'htmlform-float-invalid' )->parseAsBlock();
+		}
+
+		# 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 $this->msg( 'htmlform-int-toolow', $min )->parseAsBlock();
+			}
+		}
+
+		if ( isset( $this->mParams['max'] ) ) {
+			$max = $this->mParams['max'];
+
+			if ( $max < $value ) {
+				return $this->msg( 'htmlform-int-toohigh', $max )->parseAsBlock();
+			}
+		}
+
+		return true;
+	}
+}
diff --git a/includes/htmlform/HTMLForm.php b/includes/htmlform/HTMLForm.php
new file mode 100644
index 00000000..d582da3b
--- /dev/null
+++ b/includes/htmlform/HTMLForm.php
@@ -0,0 +1,1472 @@
+<?php
+
+/**
+ * HTML form generation and submission handling.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * 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.
+ *
+ * You can find extensive documentation on the www.mediawiki.org wiki:
+ *  - https://www.mediawiki.org/wiki/HTMLForm
+ *  - https://www.mediawiki.org/wiki/HTMLForm/tutorial
+ *
+ * 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
+ *    'csshelpclass'        -- CSS class used to style help text
+ *    'options'             -- associative array mapping labels to values.
+ *                             Some field types support multi-level arrays.
+ *    'options-messages'    -- associative array mapping message keys to values.
+ *                             Some field types support multi-level arrays.
+ *    'options-message'     -- message key to be parsed to extract the list of
+ *                             options (like 'ipbreason-dropdown').
+ *    '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 text for a message to use as a help text.
+ *    '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' and 'help'.
+ *    'help-messages'       -- array of message key. As above, each item can
+ *                             be an array of msg key and then parameters.
+ *                             Overwrites 'help'.
+ *    '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.
+ *
+ * Since 1.20, you can chain mutators to ease the form generation:
+ * @par Example:
+ * @code
+ * $form = new HTMLForm( $someFields );
+ * $form->setMethod( 'get' )
+ *      ->setWrapperLegendMsg( 'message-key' )
+ *      ->prepareForm()
+ *      ->displayForm( '' );
+ * @endcode
+ * Note that you will have prepareForm and displayForm at the end. Other
+ * methods call done after that would simply not be part of the form :(
+ *
+ * @todo Document 'section' / 'subsection' stuff
+ */
+class HTMLForm extends ContextSource {
+	// A mapping of 'type' inputs onto standard HTMLFormField subclasses
+	public static $typeMappings = array(
+		'api' => 'HTMLApiField',
+		'text' => 'HTMLTextField',
+		'textarea' => 'HTMLTextAreaField',
+		'select' => 'HTMLSelectField',
+		'radio' => 'HTMLRadioField',
+		'multiselect' => 'HTMLMultiSelectField',
+		'limitselect' => 'HTMLSelectLimitField',
+		'check' => 'HTMLCheckField',
+		'toggle' => 'HTMLCheckField',
+		'int' => 'HTMLIntField',
+		'float' => 'HTMLFloatField',
+		'info' => 'HTMLInfoField',
+		'selectorother' => 'HTMLSelectOrOtherField',
+		'selectandother' => 'HTMLSelectAndOtherField',
+		'submit' => 'HTMLSubmitField',
+		'hidden' => 'HTMLHiddenField',
+		'edittools' => 'HTMLEditTools',
+		'checkmatrix' => 'HTMLCheckMatrix',
+		'cloner' => 'HTMLFormFieldCloner',
+		'autocompleteselect' => 'HTMLAutoCompleteSelectField',
+		// HTMLTextField will output the correct type="" attribute automagically.
+		// There are about four zillion other HTML5 input types, like range, but
+		// we don't use those at the moment, so no point in adding all of them.
+		'email' => 'HTMLTextField',
+		'password' => 'HTMLTextField',
+		'url' => 'HTMLTextField',
+	);
+
+	public $mFieldData;
+
+	protected $mMessagePrefix;
+
+	/** @var HTMLFormField[] */
+	protected $mFlatFields;
+
+	protected $mFieldTree;
+	protected $mShowReset = false;
+	protected $mShowSubmit = true;
+	protected $mSubmitModifierClass = 'mw-ui-constructive';
+
+	protected $mSubmitCallback;
+	protected $mValidationErrorMessage;
+
+	protected $mPre = '';
+	protected $mHeader = '';
+	protected $mFooter = '';
+	protected $mSectionHeaders = array();
+	protected $mSectionFooters = array();
+	protected $mPost = '';
+	protected $mId;
+	protected $mTableId = '';
+
+	protected $mSubmitID;
+	protected $mSubmitName;
+	protected $mSubmitText;
+	protected $mSubmitTooltip;
+
+	protected $mTitle;
+	protected $mMethod = 'post';
+	protected $mWasSubmitted = false;
+
+	/**
+	 * Form action URL. false means we will use the URL to set Title
+	 * @since 1.19
+	 * @var bool|string
+	 */
+	protected $mAction = false;
+
+	protected $mUseMultipart = false;
+	protected $mHiddenFields = array();
+	protected $mButtons = array();
+
+	protected $mWrapperLegend = false;
+
+	/**
+	 * Salt for the edit token.
+	 * @var string|array
+	 */
+	protected $mTokenSalt = '';
+
+	/**
+	 * If true, sections that contain both fields and subsections will
+	 * render their subsections before their fields.
+	 *
+	 * Subclasses may set this to false to render subsections after fields
+	 * instead.
+	 */
+	protected $mSubSectionBeforeFields = true;
+
+	/**
+	 * Format in which to display form. For viable options,
+	 * @see $availableDisplayFormats
+	 * @var string
+	 */
+	protected $displayFormat = 'table';
+
+	/**
+	 * Available formats in which to display the form
+	 * @var array
+	 */
+	protected $availableDisplayFormats = array(
+		'table',
+		'div',
+		'raw',
+		'vform',
+	);
+
+	/**
+	 * Build a new HTMLForm from an array of field attributes
+	 *
+	 * @param array $descriptor Array of Field constructs, as described above
+	 * @param IContextSource $context Available since 1.18, will become compulsory in 1.18.
+	 *     Obviates the need to call $form->setTitle()
+	 * @param string $messagePrefix A prefix to go in front of default messages
+	 */
+	public function __construct( $descriptor, /*IContextSource*/ $context = null,
+		$messagePrefix = ''
+	) {
+		if ( $context instanceof IContextSource ) {
+			$this->setContext( $context );
+			$this->mTitle = false; // We don't need them to set a title
+			$this->mMessagePrefix = $messagePrefix;
+		} elseif ( is_null( $context ) && $messagePrefix !== '' ) {
+			$this->mMessagePrefix = $messagePrefix;
+		} elseif ( is_string( $context ) && $messagePrefix === '' ) {
+			// B/C since 1.18
+			// it's actually $messagePrefix
+			$this->mMessagePrefix = $context;
+		}
+
+		// 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 );
+			// FIXME During field's construct, the parent form isn't available!
+			// could add a 'parent' name-value to $info, could add a third parameter.
+			$field->mParent = $this;
+
+			// vform gets too much space if empty labels generate HTML.
+			if ( $this->isVForm() ) {
+				$field->setShowEmptyLabel( false );
+			}
+
+			$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;
+	}
+
+	/**
+	 * Set format in which to display the form
+	 *
+	 * @param string $format The name of the format to use, must be one of
+	 *   $this->availableDisplayFormats
+	 *
+	 * @throws MWException
+	 * @since 1.20
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function setDisplayFormat( $format ) {
+		if ( !in_array( $format, $this->availableDisplayFormats ) ) {
+			throw new MWException( 'Display format must be one of ' .
+				print_r( $this->availableDisplayFormats, true ) );
+		}
+		$this->displayFormat = $format;
+
+		return $this;
+	}
+
+	/**
+	 * Getter for displayFormat
+	 * @since 1.20
+	 * @return string
+	 */
+	public function getDisplayFormat() {
+		$format = $this->displayFormat;
+		if ( !$this->getConfig()->get( 'HTMLFormAllowTableFormat' ) && $format === 'table' ) {
+			$format = 'div';
+		}
+		return $format;
+	}
+
+	/**
+	 * Test if displayFormat is 'vform'
+	 * @since 1.22
+	 * @return bool
+	 */
+	public function isVForm() {
+		return $this->displayFormat === 'vform';
+	}
+
+	/**
+	 * Get the HTMLFormField subclass for this descriptor.
+	 *
+	 * The descriptor can be passed either 'class' which is the name of
+	 * a HTMLFormField subclass, or a shorter 'type' which is an alias.
+	 * This makes sure the 'class' is always set, and also is returned by
+	 * this function for ease.
+	 *
+	 * @since 1.23
+	 *
+	 * @param string $fieldname Name of the field
+	 * @param array $descriptor Input Descriptor, as described above
+	 *
+	 * @throws MWException
+	 * @return string Name of a HTMLFormField subclass
+	 */
+	public static function getClassFromDescriptor( $fieldname, &$descriptor ) {
+		if ( isset( $descriptor['class'] ) ) {
+			$class = $descriptor['class'];
+		} elseif ( isset( $descriptor['type'] ) ) {
+			$class = self::$typeMappings[$descriptor['type']];
+			$descriptor['class'] = $class;
+		} else {
+			$class = null;
+		}
+
+		if ( !$class ) {
+			throw new MWException( "Descriptor with no class for $fieldname: "
+				. print_r( $descriptor, true ) );
+		}
+
+		return $class;
+	}
+
+	/**
+	 * Initialise a new Object for the field
+	 *
+	 * @param string $fieldname Name of the field
+	 * @param array $descriptor Input Descriptor, as described above
+	 *
+	 * @throws MWException
+	 * @return HTMLFormField Instance of a subclass of HTMLFormField
+	 */
+	public static function loadInputFromParameters( $fieldname, $descriptor ) {
+		$class = self::getClassFromDescriptor( $fieldname, $descriptor );
+
+		$descriptor['fieldname'] = $fieldname;
+
+		# @todo This will throw a fatal error whenever someone try to use
+		# 'class' to feed a CSS class instead of 'cssclass'. Would be
+		# great to avoid the fatal error and show a nice error.
+		$obj = new $class( $descriptor );
+
+		return $obj;
+	}
+
+	/**
+	 * Prepare form for submission.
+	 *
+	 * @attention When doing method chaining, that should be the very last
+	 * method call before displayForm().
+	 *
+	 * @throws MWException
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function prepareForm() {
+		# Check if we have the info we need
+		if ( !$this->mTitle instanceof Title && $this->mTitle !== false ) {
+			throw new MWException( "You must call setTitle() on an HTMLForm" );
+		}
+
+		# Load data from the request.
+		$this->loadData();
+
+		return $this;
+	}
+
+	/**
+	 * Try submitting, with edit token check first
+	 * @return Status|bool
+	 */
+	function tryAuthorizedSubmit() {
+		$result = false;
+
+		$submit = false;
+		if ( $this->getMethod() != 'post' ) {
+			$submit = true; // no session check needed
+		} elseif ( $this->getRequest()->wasPosted() ) {
+			$editToken = $this->getRequest()->getVal( 'wpEditToken' );
+			if ( $this->getUser()->isLoggedIn() || $editToken != null ) {
+				// Session tokens for logged-out users have no security value.
+				// However, if the user gave one, check it in order to give a nice
+				// "session expired" error instead of "permission denied" or such.
+				$submit = $this->getUser()->matchEditToken( $editToken, $this->mTokenSalt );
+			} else {
+				$submit = true;
+			}
+		}
+
+		if ( $submit ) {
+			$this->mWasSubmitted = true;
+			$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 validation
+	 * errors
+	 * @return bool|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 submission callback
+	 * function if everything is kosher.
+	 * @throws MWException
+	 * @return bool|string|array|Status
+	 *     - Bool true or a good Status object indicates success,
+	 *     - Bool false indicates no submission was attempted,
+	 *     - Anything else indicates failure. The value may be a fatal Status
+	 *       object, an HTML string, or an array of arrays (message keys and
+	 *       params) or strings (message keys)
+	 */
+	function trySubmit() {
+		$this->mWasSubmitted = true;
+
+		# Check for cancelled submission
+		foreach ( $this->mFlatFields as $fieldname => $field ) {
+			if ( !empty( $field->mParams['nodata'] ) ) {
+				continue;
+			}
+			if ( $field->cancelSubmit( $this->mFieldData[$fieldname], $this->mFieldData ) ) {
+				$this->mWasSubmitted = false;
+				return false;
+			}
+		}
+
+		# Check for validation
+		foreach ( $this->mFlatFields as $fieldname => $field ) {
+			if ( !empty( $field->mParams['nodata'] ) ) {
+				continue;
+			}
+			if ( $field->isHidden( $this->mFieldData ) ) {
+				continue;
+			}
+			if ( $field->validate(
+					$this->mFieldData[$fieldname],
+					$this->mFieldData )
+				!== true
+			) {
+				return isset( $this->mValidationErrorMessage )
+					? $this->mValidationErrorMessage
+					: array( 'htmlform-invalid-input' );
+			}
+		}
+
+		$callback = $this->mSubmitCallback;
+		if ( !is_callable( $callback ) ) {
+			throw new MWException( 'HTMLForm: no submit callback provided. Use ' .
+				'setSubmitCallback() to set one.' );
+		}
+
+		$data = $this->filterDataForSubmit( $this->mFieldData );
+
+		$res = call_user_func( $callback, $data, $this );
+		if ( $res === false ) {
+			$this->mWasSubmitted = false;
+		}
+
+		return $res;
+	}
+
+	/**
+	 * Test whether the form was considered to have been submitted or not, i.e.
+	 * whether the last call to tryAuthorizedSubmit or trySubmit returned
+	 * non-false.
+	 *
+	 * This will return false until HTMLForm::tryAuthorizedSubmit or
+	 * HTMLForm::trySubmit is called.
+	 *
+	 * @since 1.23
+	 * @return bool
+	 */
+	function wasSubmitted() {
+		return $this->mWasSubmitted;
+	}
+
+	/**
+	 * Set a callback to a function to do something with the form
+	 * once it's been successfully validated.
+	 *
+	 * @param callable $cb The function will be passed the output from
+	 *   HTMLForm::filterDataForSubmit and this HTMLForm object, and must
+	 *   return as documented for HTMLForm::trySubmit
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setSubmitCallback( $cb ) {
+		$this->mSubmitCallback = $cb;
+
+		return $this;
+	}
+
+	/**
+	 * Set a message to display on a validation error.
+	 *
+	 * @param string|array $msg String or Array of valid inputs to wfMessage()
+	 *     (so each entry can be either a String or Array)
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setValidationErrorMessage( $msg ) {
+		$this->mValidationErrorMessage = $msg;
+
+		return $this;
+	}
+
+	/**
+	 * Set the introductory message, overwriting any existing message.
+	 *
+	 * @param string $msg Complete text of message to display
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setIntro( $msg ) {
+		$this->setPreText( $msg );
+
+		return $this;
+	}
+
+	/**
+	 * Set the introductory message, overwriting any existing message.
+	 * @since 1.19
+	 *
+	 * @param string $msg Complete text of message to display
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setPreText( $msg ) {
+		$this->mPre = $msg;
+
+		return $this;
+	}
+
+	/**
+	 * Add introductory text.
+	 *
+	 * @param string $msg Complete text of message to display
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function addPreText( $msg ) {
+		$this->mPre .= $msg;
+
+		return $this;
+	}
+
+	/**
+	 * Add header text, inside the form.
+	 *
+	 * @param string $msg Complete text of message to display
+	 * @param string|null $section The section to add the header to
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	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;
+		}
+
+		return $this;
+	}
+
+	/**
+	 * Set header text, inside the form.
+	 * @since 1.19
+	 *
+	 * @param string $msg Complete text of message to display
+	 * @param string|null $section The section to add the header to
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setHeaderText( $msg, $section = null ) {
+		if ( is_null( $section ) ) {
+			$this->mHeader = $msg;
+		} else {
+			$this->mSectionHeaders[$section] = $msg;
+		}
+
+		return $this;
+	}
+
+	/**
+	 * Add footer text, inside the form.
+	 *
+	 * @param string $msg Complete text of message to display
+	 * @param string|null $section The section to add the footer text to
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	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;
+		}
+
+		return $this;
+	}
+
+	/**
+	 * Set footer text, inside the form.
+	 * @since 1.19
+	 *
+	 * @param string $msg Complete text of message to display
+	 * @param string|null $section The section to add the footer text to
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setFooterText( $msg, $section = null ) {
+		if ( is_null( $section ) ) {
+			$this->mFooter = $msg;
+		} else {
+			$this->mSectionFooters[$section] = $msg;
+		}
+
+		return $this;
+	}
+
+	/**
+	 * Add text to the end of the display.
+	 *
+	 * @param string $msg Complete text of message to display
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function addPostText( $msg ) {
+		$this->mPost .= $msg;
+
+		return $this;
+	}
+
+	/**
+	 * Set text at the end of the display.
+	 *
+	 * @param string $msg Complete text of message to display
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setPostText( $msg ) {
+		$this->mPost = $msg;
+
+		return $this;
+	}
+
+	/**
+	 * Add a hidden field to the output
+	 *
+	 * @param string $name Field name.  This will be used exactly as entered
+	 * @param string $value Field value
+	 * @param array $attribs
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function addHiddenField( $name, $value, $attribs = array() ) {
+		$attribs += array( 'name' => $name );
+		$this->mHiddenFields[] = array( $value, $attribs );
+
+		return $this;
+	}
+
+	/**
+	 * Add an array of hidden fields to the output
+	 *
+	 * @since 1.22
+	 *
+	 * @param array $fields Associative array of fields to add;
+	 *        mapping names to their values
+	 *
+	 * @return HTMLForm $this for chaining calls
+	 */
+	public function addHiddenFields( array $fields ) {
+		foreach ( $fields as $name => $value ) {
+			$this->mHiddenFields[] = array( $value, array( 'name' => $name ) );
+		}
+
+		return $this;
+	}
+
+	/**
+	 * Add a button to the form
+	 *
+	 * @param string $name Field name.
+	 * @param string $value Field value
+	 * @param string $id DOM id for the button (default: null)
+	 * @param array $attribs
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function addButton( $name, $value, $id = null, $attribs = null ) {
+		$this->mButtons[] = compact( 'name', 'value', 'id', 'attribs' );
+
+		return $this;
+	}
+
+	/**
+	 * Set the salt for the edit token.
+	 *
+	 * Only useful when the method is "post".
+	 *
+	 * @since 1.24
+	 * @param string|array $salt Salt to use
+	 * @return HTMLForm $this For chaining calls
+	 */
+	public function setTokenSalt( $salt ) {
+		$this->mTokenSalt = $salt;
+
+		return $this;
+	}
+
+	/**
+	 * Display the form (sending to the context's OutputPage object), with an
+	 * appropriate error message or stack of messages, and any validation errors, etc.
+	 *
+	 * @attention You should call prepareForm() before calling this function.
+	 * Moreover, when doing method chaining this should be the very last method
+	 * call just after prepareForm().
+	 *
+	 * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
+	 *
+	 * @return void Nothing, should be last call
+	 */
+	function displayForm( $submitResult ) {
+		$this->getOutput()->addHTML( $this->getHTML( $submitResult ) );
+	}
+
+	/**
+	 * Returns the raw HTML generated by the form
+	 *
+	 * @param bool|string|array|Status $submitResult Output from HTMLForm::trySubmit()
+	 *
+	 * @return string
+	 */
+	function getHTML( $submitResult ) {
+		# For good measure (it is the default)
+		$this->getOutput()->preventClickjacking();
+		$this->getOutput()->addModules( 'mediawiki.htmlform' );
+		if ( $this->isVForm() ) {
+			$this->getOutput()->addModuleStyles( array(
+				'mediawiki.ui',
+				'mediawiki.ui.button',
+			) );
+			// @todo Should vertical form set setWrapperLegend( false )
+			// to hide ugly fieldsets?
+		}
+
+		$html = ''
+			. $this->getErrors( $submitResult )
+			. $this->mHeader
+			. $this->getBody()
+			. $this->getHiddenFields()
+			. $this->getButtons()
+			. $this->mFooter;
+
+		$html = $this->wrapForm( $html );
+
+		return '' . $this->mPre . $html . $this->mPost;
+	}
+
+	/**
+	 * Wrap the form innards in an actual "<form>" element
+	 *
+	 * @param string $html 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->getAction(),
+			'method' => $this->getMethod(),
+			'class' => array( 'visualClear' ),
+			'enctype' => $encType,
+		);
+		if ( !empty( $this->mId ) ) {
+			$attribs['id'] = $this->mId;
+		}
+
+		if ( $this->isVForm() ) {
+			array_push( $attribs['class'], 'mw-ui-vform', 'mw-ui-container' );
+		}
+
+		return Html::rawElement( 'form', $attribs, $html );
+	}
+
+	/**
+	 * Get the hidden fields that should go inside the form.
+	 * @return string HTML.
+	 */
+	function getHiddenFields() {
+		$html = '';
+		if ( $this->getMethod() == 'post' ) {
+			$html .= Html::hidden(
+				'wpEditToken',
+				$this->getUser()->getEditToken( $this->mTokenSalt ),
+				array( 'id' => 'wpEditToken' )
+			) . "\n";
+			$html .= Html::hidden( 'title', $this->getTitle()->getPrefixedText() ) . "\n";
+		}
+
+		$articlePath = $this->getConfig()->get( 'ArticlePath' );
+		if ( strpos( $articlePath, '?' ) !== false && $this->getMethod() == 'get' ) {
+			$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() {
+		$buttons = '';
+		$useMediaWikiUIEverywhere = $this->getConfig()->get( 'UseMediaWikiUIEverywhere' );
+
+		if ( $this->mShowSubmit ) {
+			$attribs = array();
+
+			if ( isset( $this->mSubmitID ) ) {
+				$attribs['id'] = $this->mSubmitID;
+			}
+
+			if ( isset( $this->mSubmitName ) ) {
+				$attribs['name'] = $this->mSubmitName;
+			}
+
+			if ( isset( $this->mSubmitTooltip ) ) {
+				$attribs += Linker::tooltipAndAccesskeyAttribs( $this->mSubmitTooltip );
+			}
+
+			$attribs['class'] = array( 'mw-htmlform-submit' );
+
+			if ( $this->isVForm() || $useMediaWikiUIEverywhere ) {
+				array_push( $attribs['class'], 'mw-ui-button', $this->mSubmitModifierClass );
+			}
+
+			if ( $this->isVForm() ) {
+				// mw-ui-block is necessary because the buttons aren't necessarily in an
+				// immediate child div of the vform.
+				// @todo Let client specify if the primary submit button is progressive or destructive
+				array_push(
+					$attribs['class'],
+					'mw-ui-big',
+					'mw-ui-block'
+				);
+			}
+
+			$buttons .= Xml::submitButton( $this->getSubmitText(), $attribs ) . "\n";
+		}
+
+		if ( $this->mShowReset ) {
+			$buttons .= Html::element(
+				'input',
+				array(
+					'type' => 'reset',
+					'value' => $this->msg( 'htmlform-reset' )->text()
+				)
+			) . "\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'];
+			}
+
+			if ( $this->isVForm() || $useMediaWikiUIEverywhere ) {
+				if ( isset( $attrs['class'] ) ) {
+					$attrs['class'] .= ' mw-ui-button';
+				} else {
+					$attrs['class'] = 'mw-ui-button';
+				}
+				if ( $this->isVForm() ) {
+					$attrs['class'] .= ' mw-ui-big mw-ui-block';
+				}
+			}
+
+			$buttons .= Html::element( 'input', $attrs ) . "\n";
+		}
+
+		$html = Html::rawElement( 'span',
+			array( 'class' => 'mw-htmlform-submit-buttons' ), "\n$buttons" ) . "\n";
+
+		// Buttons are top-level form elements in table and div layouts,
+		// but vform wants all elements inside divs to get spaced-out block
+		// styling.
+		if ( $this->mShowSubmit && $this->isVForm() ) {
+			$html = Html::rawElement( 'div', null, "\n$html" ) . "\n";
+		}
+
+		return $html;
+	}
+
+	/**
+	 * Get the whole body of the form.
+	 * @return string
+	 */
+	function getBody() {
+		return $this->displaySection( $this->mFieldTree, $this->mTableId );
+	}
+
+	/**
+	 * Format and display an error message stack.
+	 *
+	 * @param string|array|Status $errors
+	 *
+	 * @return string
+	 */
+	function getErrors( $errors ) {
+		if ( $errors instanceof Status ) {
+			if ( $errors->isOK() ) {
+				$errorstr = '';
+			} else {
+				$errorstr = $this->getOutput()->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 array $errors Array of message keys/values
+	 *
+	 * @return string HTML, a "<ul>" list of errors
+	 */
+	public 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',
+				array(),
+				wfMessage( $msg, $error )->parse()
+			);
+		}
+
+		$errorstr = Html::rawElement( 'ul', array(), $errorstr );
+
+		return $errorstr;
+	}
+
+	/**
+	 * Set the text for the submit button
+	 *
+	 * @param string $t Plaintext
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setSubmitText( $t ) {
+		$this->mSubmitText = $t;
+
+		return $this;
+	}
+
+	/**
+	 * Identify that the submit button in the form has a destructive action
+	 *
+	 */
+	public function setSubmitDestructive() {
+		$this->mSubmitModifierClass = 'mw-ui-destructive';
+	}
+
+	/**
+	 * Set the text for the submit button to a message
+	 * @since 1.19
+	 *
+	 * @param string|Message $msg Message key or Message object
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function setSubmitTextMsg( $msg ) {
+		if ( !$msg instanceof Message ) {
+			$msg = $this->msg( $msg );
+		}
+		$this->setSubmitText( $msg->text() );
+
+		return $this;
+	}
+
+	/**
+	 * Get the text for the submit button, either customised or a default.
+	 * @return string
+	 */
+	function getSubmitText() {
+		return $this->mSubmitText
+			? $this->mSubmitText
+			: $this->msg( 'htmlform-submit' )->text();
+	}
+
+	/**
+	 * @param string $name Submit button name
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function setSubmitName( $name ) {
+		$this->mSubmitName = $name;
+
+		return $this;
+	}
+
+	/**
+	 * @param string $name Tooltip for the submit button
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function setSubmitTooltip( $name ) {
+		$this->mSubmitTooltip = $name;
+
+		return $this;
+	}
+
+	/**
+	 * Set the id for the submit button.
+	 *
+	 * @param string $t
+	 *
+	 * @todo FIXME: Integrity of $t is *not* validated
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setSubmitID( $t ) {
+		$this->mSubmitID = $t;
+
+		return $this;
+	}
+
+	/**
+	 * Stop a default submit button being shown for this form. This implies that an
+	 * alternate submit method must be provided manually.
+	 *
+	 * @since 1.22
+	 *
+	 * @param bool $suppressSubmit Set to false to re-enable the button again
+	 *
+	 * @return HTMLForm $this for chaining calls
+	 */
+	function suppressDefaultSubmit( $suppressSubmit = true ) {
+		$this->mShowSubmit = !$suppressSubmit;
+
+		return $this;
+	}
+
+	/**
+	 * Set the id of the \<table\> or outermost \<div\> element.
+	 *
+	 * @since 1.22
+	 *
+	 * @param string $id New value of the id attribute, or "" to remove
+	 *
+	 * @return HTMLForm $this for chaining calls
+	 */
+	public function setTableId( $id ) {
+		$this->mTableId = $id;
+
+		return $this;
+	}
+
+	/**
+	 * @param string $id DOM id for the form
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function setId( $id ) {
+		$this->mId = $id;
+
+		return $this;
+	}
+
+	/**
+	 * Prompt the whole form to be wrapped in a "<fieldset>", with
+	 * this text as its "<legend>" element.
+	 *
+	 * @param string|bool $legend HTML to go inside the "<legend>" element, or
+	 * false for no <legend>
+	 *     Will be escaped
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function setWrapperLegend( $legend ) {
+		$this->mWrapperLegend = $legend;
+
+		return $this;
+	}
+
+	/**
+	 * Prompt the whole form to be wrapped in a "<fieldset>", with
+	 * this message as its "<legend>" element.
+	 * @since 1.19
+	 *
+	 * @param string|Message $msg Message key or Message object
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function setWrapperLegendMsg( $msg ) {
+		if ( !$msg instanceof Message ) {
+			$msg = $this->msg( $msg );
+		}
+		$this->setWrapperLegend( $msg->text() );
+
+		return $this;
+	}
+
+	/**
+	 * Set the prefix for various default messages
+	 * @todo Currently only used for the "<fieldset>" legend on forms
+	 * with multiple sections; should be used elsewhere?
+	 *
+	 * @param string $p
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setMessagePrefix( $p ) {
+		$this->mMessagePrefix = $p;
+
+		return $this;
+	}
+
+	/**
+	 * Set the title for form submission
+	 *
+	 * @param Title $t Title of page the form is on/should be posted to
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function setTitle( $t ) {
+		$this->mTitle = $t;
+
+		return $this;
+	}
+
+	/**
+	 * Get the title
+	 * @return Title
+	 */
+	function getTitle() {
+		return $this->mTitle === false
+			? $this->getContext()->getTitle()
+			: $this->mTitle;
+	}
+
+	/**
+	 * Set the method used to submit the form
+	 *
+	 * @param string $method
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function setMethod( $method = 'post' ) {
+		$this->mMethod = $method;
+
+		return $this;
+	}
+
+	public function getMethod() {
+		return $this->mMethod;
+	}
+
+	/**
+	 * @todo Document
+	 *
+	 * @param array[]|HTMLFormField[] $fields Array of fields (either arrays or
+	 *   objects).
+	 * @param string $sectionName ID attribute of the "<table>" tag for this
+	 *   section, ignored if empty.
+	 * @param string $fieldsetIDPrefix ID prefix for the "<fieldset>" tag of
+	 *   each subsection, ignored if empty.
+	 * @param bool &$hasUserVisibleFields Whether the section had user-visible fields.
+	 *
+	 * @return string
+	 */
+	public function displaySection( $fields,
+		$sectionName = '',
+		$fieldsetIDPrefix = '',
+		&$hasUserVisibleFields = false ) {
+		$displayFormat = $this->getDisplayFormat();
+
+		$html = '';
+		$subsectionHtml = '';
+		$hasLabel = false;
+
+		switch ( $displayFormat ) {
+			case 'table':
+				$getFieldHtmlMethod = 'getTableRow';
+				break;
+			case 'vform':
+				// Close enough to a div.
+				$getFieldHtmlMethod = 'getDiv';
+				break;
+			case 'div':
+				$getFieldHtmlMethod = 'getDiv';
+				break;
+			default:
+				$getFieldHtmlMethod = 'get' . ucfirst( $displayFormat );
+		}
+
+		foreach ( $fields as $key => $value ) {
+			if ( $value instanceof HTMLFormField ) {
+				$v = empty( $value->mParams['nodata'] )
+					? $this->mFieldData[$key]
+					: $value->getDefault();
+				$html .= $value->$getFieldHtmlMethod( $v );
+
+				$labelValue = trim( $value->getLabel() );
+				if ( $labelValue != '&#160;' && $labelValue !== '' ) {
+					$hasLabel = true;
+				}
+
+				if ( get_class( $value ) !== 'HTMLHiddenField' &&
+					get_class( $value ) !== 'HTMLApiField'
+				) {
+					$hasUserVisibleFields = true;
+				}
+			} elseif ( is_array( $value ) ) {
+				$subsectionHasVisibleFields = false;
+				$section =
+					$this->displaySection( $value,
+						"mw-htmlform-$key",
+						"$fieldsetIDPrefix$key-",
+						$subsectionHasVisibleFields );
+				$legend = null;
+
+				if ( $subsectionHasVisibleFields === true ) {
+					// Display the section with various niceties.
+					$hasUserVisibleFields = true;
+
+					$legend = $this->getLegend( $key );
+
+					if ( isset( $this->mSectionHeaders[$key] ) ) {
+						$section = $this->mSectionHeaders[$key] . $section;
+					}
+					if ( isset( $this->mSectionFooters[$key] ) ) {
+						$section .= $this->mSectionFooters[$key];
+					}
+
+					$attributes = array();
+					if ( $fieldsetIDPrefix ) {
+						$attributes['id'] = Sanitizer::escapeId( "$fieldsetIDPrefix$key" );
+					}
+					$subsectionHtml .= Xml::fieldset( $legend, $section, $attributes ) . "\n";
+				} else {
+					// Just return the inputs, nothing fancy.
+					$subsectionHtml .= $section;
+				}
+			}
+		}
+
+		if ( $displayFormat !== 'raw' ) {
+			$classes = array();
+
+			if ( !$hasLabel ) { // Avoid strange spacing when no labels exist
+				$classes[] = 'mw-htmlform-nolabel';
+			}
+
+			$attribs = array(
+				'class' => implode( ' ', $classes ),
+			);
+
+			if ( $sectionName ) {
+				$attribs['id'] = Sanitizer::escapeId( $sectionName );
+			}
+
+			if ( $displayFormat === 'table' ) {
+				$html = Html::rawElement( 'table',
+						$attribs,
+						Html::rawElement( 'tbody', array(), "\n$html\n" ) ) . "\n";
+			} elseif ( $displayFormat === 'div' || $displayFormat === 'vform' ) {
+				$html = Html::rawElement( 'div', $attribs, "\n$html\n" );
+			}
+		}
+
+		if ( $this->mSubSectionBeforeFields ) {
+			return $subsectionHtml . "\n" . $html;
+		} else {
+			return $html . "\n" . $subsectionHtml;
+		}
+	}
+
+	/**
+	 * Construct the form fields from the Descriptor array
+	 */
+	function loadData() {
+		$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( $this->getRequest() );
+			}
+		}
+
+		# 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 bool $suppressReset Set to false to re-enable the button again
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	function suppressReset( $suppressReset = true ) {
+		$this->mShowReset = !$suppressReset;
+
+		return $this;
+	}
+
+	/**
+	 * 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 array $data
+	 *
+	 * @return array
+	 */
+	function filterDataForSubmit( $data ) {
+		return $data;
+	}
+
+	/**
+	 * Get a string to go in the "<legend>" of a section fieldset.
+	 * Override this if you want something more complicated.
+	 *
+	 * @param string $key
+	 *
+	 * @return string
+	 */
+	public function getLegend( $key ) {
+		return $this->msg( "{$this->mMessagePrefix}-$key" )->text();
+	}
+
+	/**
+	 * Set the value for the action attribute of the form.
+	 * When set to false (which is the default state), the set title is used.
+	 *
+	 * @since 1.19
+	 *
+	 * @param string|bool $action
+	 *
+	 * @return HTMLForm $this for chaining calls (since 1.20)
+	 */
+	public function setAction( $action ) {
+		$this->mAction = $action;
+
+		return $this;
+	}
+
+	/**
+	 * Get the value for the action attribute of the form.
+	 *
+	 * @since 1.22
+	 *
+	 * @return string
+	 */
+	public function getAction() {
+		// If an action is alredy provided, return it
+		if ( $this->mAction !== false ) {
+			return $this->mAction;
+		}
+
+		$articlePath = $this->getConfig()->get( 'ArticlePath' );
+		// Check whether we are in GET mode and the ArticlePath contains a "?"
+		// meaning that getLocalURL() would return something like "index.php?title=...".
+		// As browser remove the query string before submitting GET forms,
+		// it means that the title would be lost. In such case use wfScript() instead
+		// and put title in an hidden field (see getHiddenFields()).
+		if ( strpos( $articlePath, '?' ) !== false && $this->getMethod() === 'get' ) {
+			return wfScript();
+		}
+
+		return $this->getTitle()->getLocalURL();
+	}
+}
diff --git a/includes/htmlform/HTMLFormField.php b/includes/htmlform/HTMLFormField.php
new file mode 100644
index 00000000..4cf23942
--- /dev/null
+++ b/includes/htmlform/HTMLFormField.php
@@ -0,0 +1,893 @@
+<?php
+
+/**
+ * The parent class to generate form fields.  Any field type should
+ * be a subclass of this.
+ */
+abstract class HTMLFormField {
+	public $mParams;
+
+	protected $mValidationCallback;
+	protected $mFilterCallback;
+	protected $mName;
+	protected $mLabel; # String label.  Set on construction
+	protected $mID;
+	protected $mClass = '';
+	protected $mHelpClass = false;
+	protected $mDefault;
+	protected $mOptions = false;
+	protected $mOptionsLabelsNotFromMessage = false;
+	protected $mHideIf = null;
+
+	/**
+	 * @var bool If true will generate an empty div element with no label
+	 * @since 1.22
+	 */
+	protected $mShowEmptyLabels = true;
+
+	/**
+	 * @var HTMLForm
+	 */
+	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 string $value The value to set the input to; eg a default
+	 *     text for a text input.
+	 *
+	 * @return string Valid HTML.
+	 */
+	abstract function getInputHTML( $value );
+
+	/**
+	 * Get a translated interface message
+	 *
+	 * This is a wrapper around $this->mParent->msg() if $this->mParent is set
+	 * and wfMessage() otherwise.
+	 *
+	 * Parameters are the same as wfMessage().
+	 *
+	 * @return Message
+	 */
+	function msg() {
+		$args = func_get_args();
+
+		if ( $this->mParent ) {
+			$callback = array( $this->mParent, 'msg' );
+		} else {
+			$callback = 'wfMessage';
+		}
+
+		return call_user_func_array( $callback, $args );
+	}
+
+
+	/**
+	 * Fetch a field value from $alldata for the closest field matching a given
+	 * name.
+	 *
+	 * This is complex because it needs to handle array fields like the user
+	 * would expect. The general algorithm is to look for $name as a sibling
+	 * of $this, then a sibling of $this's parent, and so on. Keeping in mind
+	 * that $name itself might be referencing an array.
+	 *
+	 * @param array $alldata
+	 * @param string $name
+	 * @return string
+	 */
+	protected function getNearestFieldByName( $alldata, $name ) {
+		$tmp = $this->mName;
+		$thisKeys = array();
+		while ( preg_match( '/^(.+)\[([^\]]+)\]$/', $tmp, $m ) ) {
+			array_unshift( $thisKeys, $m[2] );
+			$tmp = $m[1];
+		}
+		if ( substr( $tmp, 0, 2 ) == 'wp' &&
+			!isset( $alldata[$tmp] ) &&
+			isset( $alldata[substr( $tmp, 2 )] )
+		) {
+			// Adjust for name mangling.
+			$tmp = substr( $tmp, 2 );
+		}
+		array_unshift( $thisKeys, $tmp );
+
+		$tmp = $name;
+		$nameKeys = array();
+		while ( preg_match( '/^(.+)\[([^\]]+)\]$/', $tmp, $m ) ) {
+			array_unshift( $nameKeys, $m[2] );
+			$tmp = $m[1];
+		}
+		array_unshift( $nameKeys, $tmp );
+
+		$testValue = '';
+		for ( $i = count( $thisKeys ) - 1; $i >= 0; $i-- ) {
+			$keys = array_merge( array_slice( $thisKeys, 0, $i ), $nameKeys );
+			$data = $alldata;
+			while ( $keys ) {
+				$key = array_shift( $keys );
+				if ( !is_array( $data ) || !isset( $data[$key] ) ) {
+					continue 2;
+				}
+				$data = $data[$key];
+			}
+			$testValue = (string)$data;
+			break;
+		}
+
+		return $testValue;
+	}
+
+	/**
+	 * Helper function for isHidden to handle recursive data structures.
+	 *
+	 * @param array $alldata
+	 * @param array $params
+	 * @return bool
+	 */
+	protected function isHiddenRecurse( array $alldata, array $params ) {
+		$origParams = $params;
+		$op = array_shift( $params );
+
+		try {
+			switch ( $op ) {
+				case 'AND':
+					foreach ( $params as $i => $p ) {
+						if ( !is_array( $p ) ) {
+							throw new MWException(
+								"Expected array, found " . gettype( $p ) . " at index $i"
+							);
+						}
+						if ( !$this->isHiddenRecurse( $alldata, $p ) ) {
+							return false;
+						}
+					}
+					return true;
+
+				case 'OR':
+					foreach ( $params as $p ) {
+						if ( !is_array( $p ) ) {
+							throw new MWException(
+								"Expected array, found " . gettype( $p ) . " at index $i"
+							);
+						}
+						if ( $this->isHiddenRecurse( $alldata, $p ) ) {
+							return true;
+						}
+					}
+					return false;
+
+				case 'NAND':
+					foreach ( $params as $i => $p ) {
+						if ( !is_array( $p ) ) {
+							throw new MWException(
+								"Expected array, found " . gettype( $p ) . " at index $i"
+							);
+						}
+						if ( !$this->isHiddenRecurse( $alldata, $p ) ) {
+							return true;
+						}
+					}
+					return false;
+
+				case 'NOR':
+					foreach ( $params as $p ) {
+						if ( !is_array( $p ) ) {
+							throw new MWException(
+								"Expected array, found " . gettype( $p ) . " at index $i"
+							);
+						}
+						if ( $this->isHiddenRecurse( $alldata, $p ) ) {
+							return false;
+						}
+					}
+					return true;
+
+				case 'NOT':
+					if ( count( $params ) !== 1 ) {
+						throw new MWException( "NOT takes exactly one parameter" );
+					}
+					$p = $params[0];
+					if ( !is_array( $p ) ) {
+						throw new MWException(
+							"Expected array, found " . gettype( $p ) . " at index 0"
+						);
+					}
+					return !$this->isHiddenRecurse( $alldata, $p );
+
+				case '===':
+				case '!==':
+					if ( count( $params ) !== 2 ) {
+						throw new MWException( "$op takes exactly two parameters" );
+					}
+					list( $field, $value ) = $params;
+					if ( !is_string( $field ) || !is_string( $value ) ) {
+						throw new MWException( "Parameters for $op must be strings" );
+					}
+					$testValue = $this->getNearestFieldByName( $alldata, $field );
+					switch ( $op ) {
+						case '===':
+							return ( $value === $testValue );
+						case '!==':
+							return ( $value !== $testValue );
+					}
+
+				default:
+					throw new MWException( "Unknown operation" );
+			}
+		} catch ( MWException $ex ) {
+			throw new MWException(
+				"Invalid hide-if specification for $this->mName: " .
+				$ex->getMessage() . " in " . var_export( $origParams, true ),
+				0, $ex
+			);
+		}
+	}
+
+	/**
+	 * Test whether this field is supposed to be hidden, based on the values of
+	 * the other form fields.
+	 *
+	 * @since 1.23
+	 * @param array $alldata The data collected from the form
+	 * @return bool
+	 */
+	function isHidden( $alldata ) {
+		if ( !$this->mHideIf ) {
+			return false;
+		}
+
+		return $this->isHiddenRecurse( $alldata, $this->mHideIf );
+	}
+
+	/**
+	 * Override this function if the control can somehow trigger a form
+	 * submission that shouldn't actually submit the HTMLForm.
+	 *
+	 * @since 1.23
+	 * @param string|array $value The value the field was submitted with
+	 * @param array $alldata The data collected from the form
+	 *
+	 * @return bool True to cancel the submission
+	 */
+	function cancelSubmit( $value, $alldata ) {
+		return false;
+	}
+
+	/**
+	 * 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 string|array $value The value the field was submitted with
+	 * @param array $alldata The data collected from the form
+	 *
+	 * @return bool|string True on success, or String error to display, or
+	 *   false to fail validation without displaying an error.
+	 */
+	function validate( $value, $alldata ) {
+		if ( $this->isHidden( $alldata ) ) {
+			return true;
+		}
+
+		if ( isset( $this->mParams['required'] )
+			&& $this->mParams['required'] !== false
+			&& $value === ''
+		) {
+			return $this->msg( 'htmlform-required' )->parse();
+		}
+
+		if ( isset( $this->mValidationCallback ) ) {
+			return call_user_func( $this->mValidationCallback, $value, $alldata, $this->mParent );
+		}
+
+		return true;
+	}
+
+	function filter( $value, $alldata ) {
+		if ( isset( $this->mFilterCallback ) ) {
+			$value = call_user_func( $this->mFilterCallback, $value, $alldata, $this->mParent );
+		}
+
+		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;
+	}
+
+	/**
+	 * Tell the field whether to generate a separate label element if its label
+	 * is blank.
+	 *
+	 * @since 1.22
+	 *
+	 * @param bool $show Set to false to not generate a label.
+	 * @return void
+	 */
+	public function setShowEmptyLabel( $show ) {
+		$this->mShowEmptyLabels = $show;
+	}
+
+	/**
+	 * 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 WebRequest $request
+	 * @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 array $params Associative Array. See HTMLForm doc for syntax.
+	 *
+	 * @since 1.22 The 'label' attribute no longer accepts raw HTML, use 'label-raw' instead
+	 * @throws MWException
+	 */
+	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 = wfMessage( $msg, $msgInfo )->parse();
+		} elseif ( isset( $params['label'] ) ) {
+			if ( $params['label'] === '&#160;' ) {
+				// Apparently some things set &nbsp directly and in an odd format
+				$this->mLabel = '&#160;';
+			} else {
+				$this->mLabel = htmlspecialchars( $params['label'] );
+			}
+		} elseif ( isset( $params['label-raw'] ) ) {
+			$this->mLabel = $params['label-raw'];
+		}
+
+		$this->mName = "wp{$params['fieldname']}";
+		if ( isset( $params['name'] ) ) {
+			$this->mName = $params['name'];
+		}
+
+		$validName = Sanitizer::escapeId( $this->mName );
+		$validName = str_replace( array( '.5B', '.5D' ), array( '[', ']' ), $validName );
+		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['csshelpclass'] ) ) {
+			$this->mHelpClass = $params['csshelpclass'];
+		}
+
+		if ( isset( $params['validation-callback'] ) ) {
+			$this->mValidationCallback = $params['validation-callback'];
+		}
+
+		if ( isset( $params['filter-callback'] ) ) {
+			$this->mFilterCallback = $params['filter-callback'];
+		}
+
+		if ( isset( $params['flatlist'] ) ) {
+			$this->mClass .= ' mw-htmlform-flatlist';
+		}
+
+		if ( isset( $params['hidelabel'] ) ) {
+			$this->mShowEmptyLabels = false;
+		}
+
+		if ( isset( $params['hide-if'] ) ) {
+			$this->mHideIf = $params['hide-if'];
+		}
+	}
+
+	/**
+	 * Get the complete table row for the input, including help text,
+	 * labels, and whatever.
+	 *
+	 * @param string $value The value to set the input to.
+	 *
+	 * @return string Complete HTML table row.
+	 */
+	function getTableRow( $value ) {
+		list( $errors, $errorClass ) = $this->getErrorsAndErrorClass( $value );
+		$inputHtml = $this->getInputHTML( $value );
+		$fieldType = get_class( $this );
+		$helptext = $this->getHelpTextHtmlTable( $this->getHelpText() );
+		$cellAttributes = array();
+		$rowAttributes = array();
+		$rowClasses = '';
+
+		if ( !empty( $this->mParams['vertical-label'] ) ) {
+			$cellAttributes['colspan'] = 2;
+			$verticalLabel = true;
+		} else {
+			$verticalLabel = false;
+		}
+
+		$label = $this->getLabelHtml( $cellAttributes );
+
+		$field = Html::rawElement(
+			'td',
+			array( 'class' => 'mw-input' ) + $cellAttributes,
+			$inputHtml . "\n$errors"
+		);
+
+		if ( $this->mHideIf ) {
+			$rowAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
+			$rowClasses .= ' mw-htmlform-hide-if';
+		}
+
+		if ( $verticalLabel ) {
+			$html = Html::rawElement( 'tr',
+				$rowAttributes + array( 'class' => "mw-htmlform-vertical-label $rowClasses" ), $label );
+			$html .= Html::rawElement( 'tr',
+				$rowAttributes + array(
+					'class' => "mw-htmlform-field-$fieldType {$this->mClass} $errorClass $rowClasses"
+				),
+				$field );
+		} else {
+			$html =
+				Html::rawElement( 'tr',
+					$rowAttributes + array(
+						'class' => "mw-htmlform-field-$fieldType {$this->mClass} $errorClass $rowClasses"
+					),
+					$label . $field );
+		}
+
+		return $html . $helptext;
+	}
+
+	/**
+	 * Get the complete div for the input, including help text,
+	 * labels, and whatever.
+	 * @since 1.20
+	 *
+	 * @param string $value The value to set the input to.
+	 *
+	 * @return string Complete HTML table row.
+	 */
+	public function getDiv( $value ) {
+		list( $errors, $errorClass ) = $this->getErrorsAndErrorClass( $value );
+		$inputHtml = $this->getInputHTML( $value );
+		$fieldType = get_class( $this );
+		$helptext = $this->getHelpTextHtmlDiv( $this->getHelpText() );
+		$cellAttributes = array();
+		$label = $this->getLabelHtml( $cellAttributes );
+
+		$outerDivClass = array(
+			'mw-input',
+			'mw-htmlform-nolabel' => ( $label === '' )
+		);
+
+		$field = Html::rawElement(
+			'div',
+			array( 'class' => $outerDivClass ) + $cellAttributes,
+			$inputHtml . "\n$errors"
+		);
+		$divCssClasses = array( "mw-htmlform-field-$fieldType", $this->mClass, $errorClass );
+		if ( $this->mParent->isVForm() ) {
+			$divCssClasses[] = 'mw-ui-vform-field';
+		}
+
+		$wrapperAttributes = array(
+			'class' => $divCssClasses,
+		);
+		if ( $this->mHideIf ) {
+			$wrapperAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
+			$wrapperAttributes['class'][] = ' mw-htmlform-hide-if';
+		}
+		$html = Html::rawElement( 'div', $wrapperAttributes, $label . $field );
+		$html .= $helptext;
+
+		return $html;
+	}
+
+	/**
+	 * Get the complete raw fields for the input, including help text,
+	 * labels, and whatever.
+	 * @since 1.20
+	 *
+	 * @param string $value The value to set the input to.
+	 *
+	 * @return string Complete HTML table row.
+	 */
+	public function getRaw( $value ) {
+		list( $errors, ) = $this->getErrorsAndErrorClass( $value );
+		$inputHtml = $this->getInputHTML( $value );
+		$helptext = $this->getHelpTextHtmlRaw( $this->getHelpText() );
+		$cellAttributes = array();
+		$label = $this->getLabelHtml( $cellAttributes );
+
+		$html = "\n$errors";
+		$html .= $label;
+		$html .= $inputHtml;
+		$html .= $helptext;
+
+		return $html;
+	}
+
+	/**
+	 * Generate help text HTML in table format
+	 * @since 1.20
+	 *
+	 * @param string|null $helptext
+	 * @return string
+	 */
+	public function getHelpTextHtmlTable( $helptext ) {
+		if ( is_null( $helptext ) ) {
+			return '';
+		}
+
+		$rowAttributes = array();
+		if ( $this->mHideIf ) {
+			$rowAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
+			$rowAttributes['class'] = 'mw-htmlform-hide-if';
+		}
+
+		$tdClasses = array( 'htmlform-tip' );
+		if ( $this->mHelpClass !== false ) {
+			$tdClasses[] = $this->mHelpClass;
+		}
+		$row = Html::rawElement( 'td', array( 'colspan' => 2, 'class' => $tdClasses ), $helptext );
+		$row = Html::rawElement( 'tr', $rowAttributes, $row );
+
+		return $row;
+	}
+
+	/**
+	 * Generate help text HTML in div format
+	 * @since 1.20
+	 *
+	 * @param string|null $helptext
+	 *
+	 * @return string
+	 */
+	public function getHelpTextHtmlDiv( $helptext ) {
+		if ( is_null( $helptext ) ) {
+			return '';
+		}
+
+		$wrapperAttributes = array(
+			'class' => 'htmlform-tip',
+		);
+		if ( $this->mHelpClass !== false ) {
+			$wrapperAttributes['class'] .= " {$this->mHelpClass}";
+		}
+		if ( $this->mHideIf ) {
+			$wrapperAttributes['data-hide-if'] = FormatJson::encode( $this->mHideIf );
+			$wrapperAttributes['class'] .= ' mw-htmlform-hide-if';
+		}
+		$div = Html::rawElement( 'div', $wrapperAttributes, $helptext );
+
+		return $div;
+	}
+
+	/**
+	 * Generate help text HTML formatted for raw output
+	 * @since 1.20
+	 *
+	 * @param string|null $helptext
+	 * @return string
+	 */
+	public function getHelpTextHtmlRaw( $helptext ) {
+		return $this->getHelpTextHtmlDiv( $helptext );
+	}
+
+	/**
+	 * Determine the help text to display
+	 * @since 1.20
+	 * @return string
+	 */
+	public function getHelpText() {
+		$helptext = null;
+
+		if ( isset( $this->mParams['help-message'] ) ) {
+			$this->mParams['help-messages'] = array( $this->mParams['help-message'] );
+		}
+
+		if ( isset( $this->mParams['help-messages'] ) ) {
+			foreach ( $this->mParams['help-messages'] as $name ) {
+				$helpMessage = (array)$name;
+				$msg = $this->msg( array_shift( $helpMessage ), $helpMessage );
+
+				if ( $msg->exists() ) {
+					if ( is_null( $helptext ) ) {
+						$helptext = '';
+					} else {
+						$helptext .= $this->msg( 'word-separator' )->escaped(); // some space
+					}
+					$helptext .= $msg->parse(); // Append message
+				}
+			}
+		} elseif ( isset( $this->mParams['help'] ) ) {
+			$helptext = $this->mParams['help'];
+		}
+
+		return $helptext;
+	}
+
+	/**
+	 * Determine form errors to display and their classes
+	 * @since 1.20
+	 *
+	 * @param string $value The value of the input
+	 * @return array
+	 */
+	public function getErrorsAndErrorClass( $value ) {
+		$errors = $this->validate( $value, $this->mParent->mFieldData );
+
+		if ( is_bool( $errors ) || !$this->mParent->wasSubmitted() ) {
+			$errors = '';
+			$errorClass = '';
+		} else {
+			$errors = self::formatErrors( $errors );
+			$errorClass = 'mw-htmlform-invalid-input';
+		}
+
+		return array( $errors, $errorClass );
+	}
+
+	function getLabel() {
+		return is_null( $this->mLabel ) ? '' : $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;
+		}
+
+		$labelValue = trim( $this->getLabel() );
+		$hasLabel = false;
+		if ( $labelValue !== '&#160;' && $labelValue !== '' ) {
+			$hasLabel = true;
+		}
+
+		$displayFormat = $this->mParent->getDisplayFormat();
+		$html = '';
+
+		if ( $displayFormat === 'table' ) {
+			$html =
+				Html::rawElement( 'td',
+					array( 'class' => 'mw-label' ) + $cellAttributes,
+					Html::rawElement( 'label', $for, $labelValue ) );
+		} elseif ( $hasLabel || $this->mShowEmptyLabels ) {
+			if ( $displayFormat === 'div' ) {
+				$html =
+					Html::rawElement( 'div',
+						array( 'class' => 'mw-label' ) + $cellAttributes,
+						Html::rawElement( 'label', $for, $labelValue ) );
+			} else {
+				$html = Html::rawElement( 'label', $for, $labelValue );
+			}
+		}
+
+		return $html;
+	}
+
+	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();
+		}
+
+		return Linker::tooltipAndAccesskeyAttribs( $this->mParams['tooltip'] );
+	}
+
+	/**
+	 * Returns the given attributes from the parameters
+	 *
+	 * @param array $list List of attributes to get
+	 * @return array Attributes
+	 */
+	public function getAttributes( array $list ) {
+		static $boolAttribs = array( 'disabled', 'required', 'autofocus', 'multiple', 'readonly' );
+
+		$ret = array();
+
+		foreach ( $list as $key ) {
+			if ( in_array( $key, $boolAttribs ) ) {
+				if ( !empty( $this->mParams[$key] ) ) {
+					$ret[$key] = '';
+				}
+			} elseif ( isset( $this->mParams[$key] ) ) {
+				$ret[$key] = $this->mParams[$key];
+			}
+		}
+
+		return $ret;
+	}
+
+	/**
+	 * Given an array of msg-key => value mappings, returns an array with keys
+	 * being the message texts. It also forces values to strings.
+	 *
+	 * @param array $options
+	 * @return array
+	 */
+	private function lookupOptionsKeys( $options ) {
+		$ret = array();
+		foreach ( $options as $key => $value ) {
+			$key = $this->msg( $key )->plain();
+			$ret[$key] = is_array( $value )
+				? $this->lookupOptionsKeys( $value )
+				: strval( $value );
+		}
+		return $ret;
+	}
+
+	/**
+	 * Recursively forces values in an array to strings, because issues arise
+	 * with integer 0 as a value.
+	 *
+	 * @param array $array
+	 * @return array
+	 */
+	static function forceToStringRecursive( $array ) {
+		if ( is_array( $array ) ) {
+			return array_map( array( __CLASS__, 'forceToStringRecursive' ), $array );
+		} else {
+			return strval( $array );
+		}
+	}
+
+	/**
+	 * Fetch the array of options from the field's parameters. In order, this
+	 * checks 'options-messages', 'options', then 'options-message'.
+	 *
+	 * @return array|null Options array
+	 */
+	public function getOptions() {
+		if ( $this->mOptions === false ) {
+			if ( array_key_exists( 'options-messages', $this->mParams ) ) {
+				$this->mOptions = $this->lookupOptionsKeys( $this->mParams['options-messages'] );
+			} elseif ( array_key_exists( 'options', $this->mParams ) ) {
+				$this->mOptionsLabelsNotFromMessage = true;
+				$this->mOptions = self::forceToStringRecursive( $this->mParams['options'] );
+			} elseif ( array_key_exists( 'options-message', $this->mParams ) ) {
+				/** @todo This is copied from Xml::listDropDown(), deprecate/avoid duplication? */
+				$message = $this->msg( $this->mParams['options-message'] )->inContentLanguage()->plain();
+
+				$optgroup = false;
+				$this->mOptions = array();
+				foreach ( explode( "\n", $message ) as $option ) {
+					$value = trim( $option );
+					if ( $value == '' ) {
+						continue;
+					} elseif ( substr( $value, 0, 1 ) == '*' && substr( $value, 1, 1 ) != '*' ) {
+						# A new group is starting...
+						$value = trim( substr( $value, 1 ) );
+						$optgroup = $value;
+					} elseif ( substr( $value, 0, 2 ) == '**' ) {
+						# groupmember
+						$opt = trim( substr( $value, 2 ) );
+						if ( $optgroup === false ) {
+							$this->mOptions[$opt] = $opt;
+						} else {
+							$this->mOptions[$optgroup][$opt] = $opt;
+						}
+					} else {
+						# groupless reason list
+						$optgroup = false;
+						$this->mOptions[$option] = $option;
+					}
+				}
+			} else {
+				$this->mOptions = null;
+			}
+		}
+
+		return $this->mOptions;
+	}
+
+	/**
+	 * flatten an array of options to a single array, for instance,
+	 * a set of "<options>" inside "<optgroups>".
+	 *
+	 * @param array $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;
+	}
+
+	/**
+	 * Formats one or more errors as accepted by field validation-callback.
+	 *
+	 * @param string|Message|array $errors Array of strings or Message instances
+	 * @return string HTML
+	 * @since 1.18
+	 */
+	protected static function formatErrors( $errors ) {
+		if ( is_array( $errors ) && count( $errors ) === 1 ) {
+			$errors = array_shift( $errors );
+		}
+
+		if ( is_array( $errors ) ) {
+			$lines = array();
+			foreach ( $errors as $error ) {
+				if ( $error instanceof Message ) {
+					$lines[] = Html::rawElement( 'li', array(), $error->parse() );
+				} else {
+					$lines[] = Html::rawElement( 'li', array(), $error );
+				}
+			}
+
+			return Html::rawElement( 'ul', array( 'class' => 'error' ), implode( "\n", $lines ) );
+		} else {
+			if ( $errors instanceof Message ) {
+				$errors = $errors->parse();
+			}
+
+			return Html::rawElement( 'span', array( 'class' => 'error' ), $errors );
+		}
+	}
+}
diff --git a/includes/htmlform/HTMLFormFieldCloner.php b/includes/htmlform/HTMLFormFieldCloner.php
new file mode 100644
index 00000000..029911cd
--- /dev/null
+++ b/includes/htmlform/HTMLFormFieldCloner.php
@@ -0,0 +1,382 @@
+<?php
+
+/**
+ * A container for HTMLFormFields that allows for multiple copies of the set of
+ * fields to be displayed to and entered by the user.
+ *
+ * Recognized parameters, besides the general ones, include:
+ *   fields - HTMLFormField descriptors for the subfields this cloner manages.
+ *     The format is just like for the HTMLForm. A field with key 'delete' is
+ *     special: it must have type = submit and will serve to delete the group
+ *     of fields.
+ *   required - If specified, at least one group of fields must be submitted.
+ *   format - HTMLForm display format to use when displaying the subfields:
+ *     'table', 'div', or 'raw'.
+ *   row-legend - If non-empty, each group of subfields will be enclosed in a
+ *     fieldset. The value is the name of a message key to use as the legend.
+ *   create-button-message - Message key to use as the text of the button to
+ *     add an additional group of fields.
+ *   delete-button-message - Message key to use as the text of automatically-
+ *     generated 'delete' button. Ignored if 'delete' is included in 'fields'.
+ *
+ * In the generated HTML, the subfields will be named along the lines of
+ * "clonerName[index][fieldname]", with ids "clonerId--index--fieldid". 'index'
+ * may be a number or an arbitrary string, and may likely change when the page
+ * is resubmitted. Cloners may be nested, resulting in field names along the
+ * lines of "cloner1Name[index1][cloner2Name][index2][fieldname]" and
+ * corresponding ids.
+ *
+ * Use of cloner may result in submissions of the page that are not submissions
+ * of the HTMLForm, when non-JavaScript clients use the create or remove buttons.
+ *
+ * The result is an array, with values being arrays mapping subfield names to
+ * their values. On non-HTMLForm-submission page loads, there may also be
+ * additional (string) keys present with other types of values.
+ *
+ * @since 1.23
+ */
+class HTMLFormFieldCloner extends HTMLFormField {
+	private static $counter = 0;
+
+	/**
+	 * @var string String uniquely identifying this cloner instance and
+	 * unlikely to exist otherwise in the generated HTML, while still being
+	 * valid as part of an HTML id.
+	 */
+	protected $uniqueId;
+
+	public function __construct( $params ) {
+		$this->uniqueId = get_class( $this ) . ++self::$counter . 'x';
+		parent::__construct( $params );
+
+		if ( empty( $this->mParams['fields'] ) || !is_array( $this->mParams['fields'] ) ) {
+			throw new MWException( 'HTMLFormFieldCloner called without any fields' );
+		}
+
+		// Make sure the delete button, if explicitly specified, is sane
+		if ( isset( $this->mParams['fields']['delete'] ) ) {
+			$class = 'mw-htmlform-cloner-delete-button';
+			$info = $this->mParams['fields']['delete'] + array(
+				'cssclass' => $class
+			);
+			unset( $info['name'], $info['class'] );
+
+			if ( !isset( $info['type'] ) || $info['type'] !== 'submit' ) {
+				throw new MWException(
+					'HTMLFormFieldCloner delete field, if specified, must be of type "submit"'
+				);
+			}
+
+			if ( !in_array( $class, explode( ' ', $info['cssclass'] ) ) ) {
+				$info['cssclass'] .= " $class";
+			}
+
+			$this->mParams['fields']['delete'] = $info;
+		}
+	}
+
+	/**
+	 * Create the HTMLFormFields that go inside this element, using the
+	 * specified key.
+	 *
+	 * @param string $key Array key under which these fields should be named
+	 * @return HTMLFormField[]
+	 */
+	protected function createFieldsForKey( $key ) {
+		$fields = array();
+		foreach ( $this->mParams['fields'] as $fieldname => $info ) {
+			$name = "{$this->mName}[$key][$fieldname]";
+			if ( isset( $info['name'] ) ) {
+				$info['name'] = "{$this->mName}[$key][{$info['name']}]";
+			} else {
+				$info['name'] = $name;
+			}
+			if ( isset( $info['id'] ) ) {
+				$info['id'] = Sanitizer::escapeId( "{$this->mID}--$key--{$info['id']}" );
+			} else {
+				$info['id'] = Sanitizer::escapeId( "{$this->mID}--$key--$fieldname" );
+			}
+			$field = HTMLForm::loadInputFromParameters( $name, $info );
+			$field->mParent = $this->mParent;
+			$fields[$fieldname] = $field;
+		}
+		return $fields;
+	}
+
+	/**
+	 * Re-key the specified values array to match the names applied by
+	 * createFieldsForKey().
+	 *
+	 * @param string $key Array key under which these fields should be named
+	 * @param array $values Values array from the request
+	 * @return array
+	 */
+	protected function rekeyValuesArray( $key, $values ) {
+		$data = array();
+		foreach ( $values as $fieldname => $value ) {
+			$name = "{$this->mName}[$key][$fieldname]";
+			$data[$name] = $value;
+		}
+		return $data;
+	}
+
+	protected function needsLabel() {
+		return false;
+	}
+
+	public function loadDataFromRequest( $request ) {
+		// It's possible that this might be posted with no fields. Detect that
+		// by looking for an edit token.
+		if ( !$request->getCheck( 'wpEditToken' ) && $request->getArray( $this->mName ) === null ) {
+			return $this->getDefault();
+		}
+
+		$values = $request->getArray( $this->mName );
+		if ( $values === null ) {
+			$values = array();
+		}
+
+		$ret = array();
+		foreach ( $values as $key => $value ) {
+			if ( $key === 'create' || isset( $value['delete'] ) ) {
+				$ret['nonjs'] = 1;
+				continue;
+			}
+
+			// Add back in $request->getValues() so things that look for e.g.
+			// wpEditToken don't fail.
+			$data = $this->rekeyValuesArray( $key, $value ) + $request->getValues();
+
+			$fields = $this->createFieldsForKey( $key );
+			$subrequest = new DerivativeRequest( $request, $data, $request->wasPosted() );
+			$row = array();
+			foreach ( $fields as $fieldname => $field ) {
+				if ( !empty( $field->mParams['nodata'] ) ) {
+					continue;
+				} elseif ( !empty( $field->mParams['disabled'] ) ) {
+					$row[$fieldname] = $field->getDefault();
+				} else {
+					$row[$fieldname] = $field->loadDataFromRequest( $subrequest );
+				}
+			}
+			$ret[] = $row;
+		}
+
+		if ( isset( $values['create'] ) ) {
+			// Non-JS client clicked the "create" button.
+			$fields = $this->createFieldsForKey( $this->uniqueId );
+			$row = array();
+			foreach ( $fields as $fieldname => $field ) {
+				if ( !empty( $field->mParams['nodata'] ) ) {
+					continue;
+				} else {
+					$row[$fieldname] = $field->getDefault();
+				}
+			}
+			$ret[] = $row;
+		}
+
+		return $ret;
+	}
+
+	public function getDefault() {
+		$ret = parent::getDefault();
+
+		// The default default is one entry with all subfields at their
+		// defaults.
+		if ( $ret === null ) {
+			$fields = $this->createFieldsForKey( $this->uniqueId );
+			$row = array();
+			foreach ( $fields as $fieldname => $field ) {
+				if ( !empty( $field->mParams['nodata'] ) ) {
+					continue;
+				} else {
+					$row[$fieldname] = $field->getDefault();
+				}
+			}
+			$ret = array( $row );
+		}
+
+		return $ret;
+	}
+
+	public function cancelSubmit( $values, $alldata ) {
+		if ( isset( $values['nonjs'] ) ) {
+			return true;
+		}
+
+		foreach ( $values as $key => $value ) {
+			$fields = $this->createFieldsForKey( $key );
+			foreach ( $fields as $fieldname => $field ) {
+				if ( !empty( $field->mParams['nodata'] ) ) {
+					continue;
+				}
+				if ( $field->cancelSubmit( $value[$fieldname], $alldata ) ) {
+					return true;
+				}
+			}
+		}
+
+		return parent::cancelSubmit( $values, $alldata );
+	}
+
+	public function validate( $values, $alldata ) {
+		if ( isset( $this->mParams['required'] )
+			&& $this->mParams['required'] !== false
+			&& !$values
+		) {
+			return $this->msg( 'htmlform-cloner-required' )->parseAsBlock();
+		}
+
+		if ( isset( $values['nonjs'] ) ) {
+			// The submission was a non-JS create/delete click, so fail
+			// validation in case cancelSubmit() somehow didn't already handle
+			// it.
+			return false;
+		}
+
+		foreach ( $values as $key => $value ) {
+			$fields = $this->createFieldsForKey( $key );
+			foreach ( $fields as $fieldname => $field ) {
+				if ( !empty( $field->mParams['nodata'] ) ) {
+					continue;
+				}
+				$ok = $field->validate( $value[$fieldname], $alldata );
+				if ( $ok !== true ) {
+					return false;
+				}
+			}
+		}
+
+		return parent::validate( $values, $alldata );
+	}
+
+	/**
+	 * Get the input HTML for the specified key.
+	 *
+	 * @param string $key Array key under which the fields should be named
+	 * @param array $values
+	 * @return string
+	 */
+	protected function getInputHTMLForKey( $key, $values ) {
+		$displayFormat = isset( $this->mParams['format'] )
+			? $this->mParams['format']
+			: $this->mParent->getDisplayFormat();
+
+		switch ( $displayFormat ) {
+			case 'table':
+				$getFieldHtmlMethod = 'getTableRow';
+				break;
+			case 'vform':
+				// Close enough to a div.
+				$getFieldHtmlMethod = 'getDiv';
+				break;
+			default:
+				$getFieldHtmlMethod = 'get' . ucfirst( $displayFormat );
+		}
+
+		$html = '';
+		$hasLabel = false;
+
+		$fields = $this->createFieldsForKey( $key );
+		foreach ( $fields as $fieldname => $field ) {
+			$v = ( empty( $field->mParams['nodata'] ) && $values !== null )
+				? $values[$fieldname]
+				: $field->getDefault();
+			$html .= $field->$getFieldHtmlMethod( $v );
+
+			$labelValue = trim( $field->getLabel() );
+			if ( $labelValue != '&#160;' && $labelValue !== '' ) {
+				$hasLabel = true;
+			}
+		}
+
+		if ( !isset( $fields['delete'] ) ) {
+			$name = "{$this->mName}[$key][delete]";
+			$label = isset( $this->mParams['delete-button-message'] )
+				? $this->mParams['delete-button-message']
+				: 'htmlform-cloner-delete';
+			$field = HTMLForm::loadInputFromParameters( $name, array(
+				'type' => 'submit',
+				'name' => $name,
+				'id' => Sanitizer::escapeId( "{$this->mID}--$key--delete" ),
+				'cssclass' => 'mw-htmlform-cloner-delete-button',
+				'default' => $this->msg( $label )->text(),
+			) );
+			$field->mParent = $this->mParent;
+			$v = $field->getDefault();
+
+			if ( $displayFormat === 'table' ) {
+				$html .= $field->$getFieldHtmlMethod( $v );
+			} else {
+				$html .= $field->getInputHTML( $v );
+			}
+		}
+
+		if ( $displayFormat !== 'raw' ) {
+			$classes = array(
+				'mw-htmlform-cloner-row',
+			);
+
+			if ( !$hasLabel ) { // Avoid strange spacing when no labels exist
+				$classes[] = 'mw-htmlform-nolabel';
+			}
+
+			$attribs = array(
+				'class' => implode( ' ', $classes ),
+			);
+
+			if ( $displayFormat === 'table' ) {
+				$html = Html::rawElement( 'table',
+					$attribs,
+					Html::rawElement( 'tbody', array(), "\n$html\n" ) ) . "\n";
+			} elseif ( $displayFormat === 'div' || $displayFormat === 'vform' ) {
+				$html = Html::rawElement( 'div', $attribs, "\n$html\n" );
+			}
+		}
+
+		if ( !empty( $this->mParams['row-legend'] ) ) {
+			$legend = $this->msg( $this->mParams['row-legend'] )->text();
+			$html = Xml::fieldset( $legend, $html );
+		}
+
+		return $html;
+	}
+
+	public function getInputHTML( $values ) {
+		$html = '';
+
+		foreach ( (array)$values as $key => $value ) {
+			if ( $key === 'nonjs' ) {
+				continue;
+			}
+			$html .= Html::rawElement( 'li', array( 'class' => 'mw-htmlform-cloner-li' ),
+				$this->getInputHTMLForKey( $key, $value )
+			);
+		}
+
+		$template = $this->getInputHTMLForKey( $this->uniqueId, null );
+		$html = Html::rawElement( 'ul', array(
+			'id' => "mw-htmlform-cloner-list-{$this->mID}",
+			'class' => 'mw-htmlform-cloner-ul',
+			'data-template' => $template,
+			'data-unique-id' => $this->uniqueId,
+		), $html );
+
+		$name = "{$this->mName}[create]";
+		$label = isset( $this->mParams['create-button-message'] )
+			? $this->mParams['create-button-message']
+			: 'htmlform-cloner-create';
+		$field = HTMLForm::loadInputFromParameters( $name, array(
+			'type' => 'submit',
+			'name' => $name,
+			'id' => Sanitizer::escapeId( "{$this->mID}--create" ),
+			'cssclass' => 'mw-htmlform-cloner-create-button',
+			'default' => $this->msg( $label )->text(),
+		) );
+		$field->mParent = $this->mParent;
+		$html .= $field->getInputHTML( $field->getDefault() );
+
+		return $html;
+	}
+}
diff --git a/includes/htmlform/HTMLFormFieldRequiredOptionsException.php b/includes/htmlform/HTMLFormFieldRequiredOptionsException.php
new file mode 100644
index 00000000..76f52866
--- /dev/null
+++ b/includes/htmlform/HTMLFormFieldRequiredOptionsException.php
@@ -0,0 +1,9 @@
+<?php
+
+class HTMLFormFieldRequiredOptionsException extends MWException {
+	public function __construct( HTMLFormField $field, array $missing ) {
+		parent::__construct( sprintf( "Form type `%s` expected the following parameters to be set: %s",
+			get_class( $field ),
+			implode( ', ', $missing ) ) );
+	}
+}
diff --git a/includes/htmlform/HTMLHiddenField.php b/includes/htmlform/HTMLHiddenField.php
new file mode 100644
index 00000000..e32c0bb2
--- /dev/null
+++ b/includes/htmlform/HTMLHiddenField.php
@@ -0,0 +1,44 @@
+<?php
+
+class HTMLHiddenField extends HTMLFormField {
+	public function __construct( $params ) {
+		parent::__construct( $params );
+
+		# Per HTML5 spec, hidden fields cannot be 'required'
+		# http://www.w3.org/TR/html5/forms.html#hidden-state-%28type=hidden%29
+		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 '';
+	}
+
+	/**
+	 * @param string $value
+	 * @return string
+	 * @since 1.20
+	 */
+	public function getDiv( $value ) {
+		return $this->getTableRow( $value );
+	}
+
+	/**
+	 * @param string $value
+	 * @return string
+	 * @since 1.20
+	 */
+	public function getRaw( $value ) {
+		return $this->getTableRow( $value );
+	}
+
+	public function getInputHTML( $value ) {
+		return '';
+	}
+}
diff --git a/includes/htmlform/HTMLInfoField.php b/includes/htmlform/HTMLInfoField.php
new file mode 100644
index 00000000..a422047a
--- /dev/null
+++ b/includes/htmlform/HTMLInfoField.php
@@ -0,0 +1,54 @@
+<?php
+
+/**
+ * An information field (text blob), not a proper input.
+ */
+class HTMLInfoField extends HTMLFormField {
+	public function __construct( $info ) {
+		$info['nodata'] = true;
+
+		parent::__construct( $info );
+	}
+
+	public function getInputHTML( $value ) {
+		return !empty( $this->mParams['raw'] ) ? $value : htmlspecialchars( $value );
+	}
+
+	public function getTableRow( $value ) {
+		if ( !empty( $this->mParams['rawrow'] ) ) {
+			return $value;
+		}
+
+		return parent::getTableRow( $value );
+	}
+
+	/**
+	 * @param string $value
+	 * @return string
+	 * @since 1.20
+	 */
+	public function getDiv( $value ) {
+		if ( !empty( $this->mParams['rawrow'] ) ) {
+			return $value;
+		}
+
+		return parent::getDiv( $value );
+	}
+
+	/**
+	 * @param string $value
+	 * @return string
+	 * @since 1.20
+	 */
+	public function getRaw( $value ) {
+		if ( !empty( $this->mParams['rawrow'] ) ) {
+			return $value;
+		}
+
+		return parent::getRaw( $value );
+	}
+
+	protected function needsLabel() {
+		return false;
+	}
+}
diff --git a/includes/htmlform/HTMLIntField.php b/includes/htmlform/HTMLIntField.php
new file mode 100644
index 00000000..28876e2c
--- /dev/null
+++ b/includes/htmlform/HTMLIntField.php
@@ -0,0 +1,27 @@
+<?php
+
+/**
+ * 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 $this->msg( 'htmlform-int-invalid' )->parseAsBlock();
+		}
+
+		return true;
+	}
+}
diff --git a/includes/htmlform/HTMLMultiSelectField.php b/includes/htmlform/HTMLMultiSelectField.php
new file mode 100644
index 00000000..1b71ab95
--- /dev/null
+++ b/includes/htmlform/HTMLMultiSelectField.php
@@ -0,0 +1,122 @@
+<?php
+
+/**
+ * Multi-select field
+ */
+class HTMLMultiSelectField extends HTMLFormField implements HTMLNestedFilterable {
+	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->getOptions() );
+
+		$validValues = array_intersect( $value, $validOptions );
+		if ( count( $validValues ) == count( $value ) ) {
+			return true;
+		} else {
+			return $this->msg( 'htmlform-select-badoption' )->parse();
+		}
+	}
+
+	function getInputHTML( $value ) {
+		$value = HTMLFormField::forceToStringRecursive( $value );
+		$html = $this->formatOptions( $this->getOptions(), $value );
+
+		return $html;
+	}
+
+	function formatOptions( $options, $value ) {
+		$html = '';
+
+		$attribs = $this->getAttributes( array( 'disabled', 'tabindex' ) );
+		$elementFunc = array( 'Html', $this->mOptionsLabelsNotFromMessage ? 'rawElement' : 'element' );
+
+		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 );
+
+				// @todo: Make this use checkLabel for consistency purposes
+				$checkbox = Xml::check(
+					$this->mName . '[]',
+					in_array( $info, $value, true ),
+					$attribs + $thisAttribs
+				);
+				$checkbox .= '&#160;' . call_user_func( $elementFunc,
+					'label',
+					array( 'for' => "{$this->mID}-$info" ),
+					$label
+				);
+
+				$html .= ' ' . Html::rawElement(
+					'div',
+					array( 'class' => 'mw-htmlform-flatlist-item' ),
+					$checkbox
+				);
+			}
+		}
+
+		return $html;
+	}
+
+	/**
+	 * @param WebRequest $request
+	 *
+	 * @return string
+	 */
+	function loadDataFromRequest( $request ) {
+		if ( $this->mParent->getMethod() == 'post' ) {
+			if ( $request->wasPosted() ) {
+				# Checkboxes are just not added to the request arrays if they're not checked,
+				# so it's perfectly possible for there not to be an entry at all
+				return $request->getArray( $this->mName, array() );
+			} else {
+				# That's ok, the user has not yet submitted the form, so show the defaults
+				return $this->getDefault();
+			}
+		} else {
+			# This is the impossible case: if we look at $_GET and see no data for our
+			# field, is it because the user has not yet submitted the form, or that they
+			# have submitted it with all the options unchecked? We will have to assume the
+			# latter, which basically means that you can't specify 'positive' defaults
+			# for GET forms.
+			# @todo FIXME...
+			return $request->getArray( $this->mName, array() );
+		}
+	}
+
+	function getDefault() {
+		if ( isset( $this->mDefault ) ) {
+			return $this->mDefault;
+		} else {
+			return array();
+		}
+	}
+
+	function filterDataForSubmit( $data ) {
+		$data = HTMLFormField::forceToStringRecursive( $data );
+		$options = HTMLFormField::flattenOptions( $this->getOptions() );
+
+		$res = array();
+		foreach ( $options as $opt ) {
+			$res["$opt"] = in_array( $opt, $data, true );
+		}
+
+		return $res;
+	}
+
+	protected function needsLabel() {
+		return false;
+	}
+}
diff --git a/includes/htmlform/HTMLNestedFilterable.php b/includes/htmlform/HTMLNestedFilterable.php
new file mode 100644
index 00000000..2c09ea4e
--- /dev/null
+++ b/includes/htmlform/HTMLNestedFilterable.php
@@ -0,0 +1,11 @@
+<?php
+
+interface HTMLNestedFilterable {
+	/**
+	 * Support for seperating multi-option preferences into multiple preferences
+	 * Due to lack of array support.
+	 *
+	 * @param array $data
+	 */
+	function filterDataForSubmit( $data );
+}
diff --git a/includes/htmlform/HTMLRadioField.php b/includes/htmlform/HTMLRadioField.php
new file mode 100644
index 00000000..8765407b
--- /dev/null
+++ b/includes/htmlform/HTMLRadioField.php
@@ -0,0 +1,71 @@
+<?php
+
+/**
+ * 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->getOptions() );
+
+		if ( in_array( strval( $value ), $validOptions, true ) ) {
+			return true;
+		} else {
+			return $this->msg( 'htmlform-select-badoption' )->parse();
+		}
+	}
+
+	/**
+	 * This returns a block of all the radio options, in one cell.
+	 * @see includes/HTMLFormField#getInputHTML()
+	 *
+	 * @param string $value
+	 *
+	 * @return string
+	 */
+	function getInputHTML( $value ) {
+		$html = $this->formatOptions( $this->getOptions(), strval( $value ) );
+
+		return $html;
+	}
+
+	function formatOptions( $options, $value ) {
+		$html = '';
+
+		$attribs = $this->getAttributes( array( 'disabled', 'tabindex' ) );
+		$elementFunc = array( 'Html', $this->mOptionsLabelsNotFromMessage ? 'rawElement' : 'element' );
+
+		# @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" );
+				$radio = Xml::radio( $this->mName, $info, $info === $value, $attribs + array( 'id' => $id ) );
+				$radio .= '&#160;' . call_user_func( $elementFunc, 'label', array( 'for' => $id ), $label );
+
+				$html .= ' ' . Html::rawElement(
+					'div',
+					array( 'class' => 'mw-htmlform-flatlist-item' ),
+					$radio
+				);
+			}
+		}
+
+		return $html;
+	}
+
+	protected function needsLabel() {
+		return false;
+	}
+}
diff --git a/includes/htmlform/HTMLSelectAndOtherField.php b/includes/htmlform/HTMLSelectAndOtherField.php
new file mode 100644
index 00000000..65176dd7
--- /dev/null
+++ b/includes/htmlform/HTMLSelectAndOtherField.php
@@ -0,0 +1,126 @@
+<?php
+
+/**
+ * Double field with a dropdown list constructed from a system message in the format
+ *     * Optgroup header
+ *     ** <option value>
+ *     * New Optgroup header
+ * Plus a text field underneath for an additional reason.  The 'value' of the field is
+ * "<select>: <extra reason>", or "<extra reason>" if nothing has been selected in the
+ * select dropdown.
+ * @todo FIXME: If made 'required', only the text field should be compulsory.
+ */
+class HTMLSelectAndOtherField extends HTMLSelectField {
+	function __construct( $params ) {
+		if ( array_key_exists( 'other', $params ) ) {
+		} elseif ( array_key_exists( 'other-message', $params ) ) {
+			$params['other'] = wfMessage( $params['other-message'] )->plain();
+		} else {
+			$params['other'] = wfMessage( 'htmlform-selectorother-other' )->plain();
+		}
+
+		parent::__construct( $params );
+
+		if ( $this->getOptions() === null ) {
+			# Sulk
+			throw new MWException( 'HTMLSelectAndOtherField called without any options' );
+		}
+		if ( !in_array( 'other', $this->mOptions, true ) ) {
+			// Have 'other' always as first element
+			$this->mOptions = array( $params['other'] => 'other' ) + $this->mOptions;
+		}
+		$this->mFlatOptions = self::flattenOptions( $this->getOptions() );
+
+	}
+
+	function getInputHTML( $value ) {
+		$select = parent::getInputHTML( $value[1] );
+
+		$textAttribs = array(
+			'id' => $this->mID . '-other',
+			'size' => $this->getSize(),
+		);
+
+		if ( $this->mClass !== '' ) {
+			$textAttribs['class'] = $this->mClass;
+		}
+
+		$allowedParams = array(
+			'required',
+			'autofocus',
+			'multiple',
+			'disabled',
+			'tabindex'
+		);
+
+		$textAttribs += $this->getAttributes( $allowedParams );
+
+		$textbox = Html::input( $this->mName . '-other', $value[2], 'text', $textAttribs );
+
+		return "$select<br />\n$textbox";
+	}
+
+	/**
+	 * @param WebRequest $request
+	 *
+	 * @return array("<overall message>","<select value>","<text field value>")
+	 */
+	function loadDataFromRequest( $request ) {
+		if ( $request->getCheck( $this->mName ) ) {
+
+			$list = $request->getText( $this->mName );
+			$text = $request->getText( $this->mName . '-other' );
+
+			if ( $list == 'other' ) {
+				$final = $text;
+			} elseif ( !in_array( $list, $this->mFlatOptions, true ) ) {
+				# User has spoofed the select form to give an option which wasn't
+				# in the original offer.  Sulk...
+				$final = $text;
+			} elseif ( $text == '' ) {
+				$final = $list;
+			} else {
+				$final = $list . $this->msg( 'colon-separator' )->inContentLanguage()->text() . $text;
+			}
+		} else {
+			$final = $this->getDefault();
+
+			$list = 'other';
+			$text = $final;
+			foreach ( $this->mFlatOptions as $option ) {
+				$match = $option . $this->msg( 'colon-separator' )->inContentLanguage()->text();
+				if ( strpos( $text, $match ) === 0 ) {
+					$list = $option;
+					$text = substr( $text, strlen( $match ) );
+					break;
+				}
+			}
+		}
+
+		return array( $final, $list, $text );
+	}
+
+	function getSize() {
+		return isset( $this->mParams['size'] ) ? $this->mParams['size'] : 45;
+	}
+
+	function validate( $value, $alldata ) {
+		# HTMLSelectField forces $value to be one of the options in the select
+		# field, which is not useful here.  But we do want the validation further up
+		# the chain
+		$p = parent::validate( $value[1], $alldata );
+
+		if ( $p !== true ) {
+			return $p;
+		}
+
+		if ( isset( $this->mParams['required'] )
+			&& $this->mParams['required'] !== false
+			&& $value[1] === ''
+		) {
+			return $this->msg( 'htmlform-required' )->parse();
+		}
+
+		return true;
+	}
+}
diff --git a/includes/htmlform/HTMLSelectField.php b/includes/htmlform/HTMLSelectField.php
new file mode 100644
index 00000000..a198037a
--- /dev/null
+++ b/includes/htmlform/HTMLSelectField.php
@@ -0,0 +1,44 @@
+<?php
+
+/**
+ * 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->getOptions() );
+
+		if ( in_array( strval( $value ), $validOptions, true ) ) {
+			return true;
+		} else {
+			return $this->msg( 'htmlform-select-badoption' )->parse();
+		}
+	}
+
+	function getInputHTML( $value ) {
+		$select = new XmlSelect( $this->mName, $this->mID, strval( $value ) );
+
+		if ( !empty( $this->mParams['disabled'] ) ) {
+			$select->setAttribute( 'disabled', 'disabled' );
+		}
+
+		$allowedParams = array( 'tabindex', 'size' );
+		$customParams = $this->getAttributes( $allowedParams );
+		foreach ( $customParams as $name => $value ) {
+			$select->setAttribute( $name, $value );
+		}
+
+		if ( $this->mClass !== '' ) {
+			$select->setAttribute( 'class', $this->mClass );
+		}
+
+		$select->addOptions( $this->getOptions() );
+
+		return $select->getHTML();
+	}
+}
diff --git a/includes/htmlform/HTMLSelectLimitField.php b/includes/htmlform/HTMLSelectLimitField.php
new file mode 100644
index 00000000..e7f1c047
--- /dev/null
+++ b/includes/htmlform/HTMLSelectLimitField.php
@@ -0,0 +1,35 @@
+<?php
+
+/**
+ * A limit dropdown, which accepts any valid number
+ */
+class HTMLSelectLimitField extends HTMLSelectField {
+	/**
+	 * Basically don't do any validation. If it's a number that's fine. Also,
+	 * add it to the list if it's not there already
+	 *
+	 * @param string $value
+	 * @param array $alldata
+	 * @return bool
+	 */
+	function validate( $value, $alldata ) {
+		if ( $value == '' ) {
+			return true;
+		}
+
+		// Let folks pick an explicit limit not from our list, as long as it's a real numbr.
+		if ( !in_array( $value, $this->mParams['options'] )
+			&& $value == intval( $value )
+			&& $value > 0
+		) {
+			// This adds the explicitly requested limit value to the drop-down,
+			// then makes sure it's sorted correctly so when we output the list
+			// later, the custom option doesn't just show up last.
+			$this->mParams['options'][$this->mParent->getLanguage()->formatNum( $value )] =
+				intval( $value );
+			asort( $this->mParams['options'] );
+		}
+
+		return true;
+	}
+}
diff --git a/includes/htmlform/HTMLSelectOrOtherField.php b/includes/htmlform/HTMLSelectOrOtherField.php
new file mode 100644
index 00000000..cbf7d122
--- /dev/null
+++ b/includes/htmlform/HTMLSelectOrOtherField.php
@@ -0,0 +1,83 @@
+<?php
+
+/**
+ * Select dropdown field, with an additional "other" textbox.
+ */
+class HTMLSelectOrOtherField extends HTMLTextField {
+	function __construct( $params ) {
+		parent::__construct( $params );
+		$this->getOptions();
+		if ( !in_array( 'other', $this->mOptions, true ) ) {
+			$msg =
+				isset( $params['other'] )
+					? $params['other']
+					: wfMessage( 'htmlform-selectorother-other' )->text();
+			// Have 'other' always as first element
+			$this->mOptions = array( $msg => 'other' ) + $this->mOptions;
+		}
+
+	}
+
+	function getInputHTML( $value ) {
+		$valInSelect = false;
+
+		if ( $value !== false ) {
+			$value = strval( $value );
+			$valInSelect = in_array(
+				$value, HTMLFormField::flattenOptions( $this->getOptions() ), true
+			);
+		}
+
+		$selected = $valInSelect ? $value : 'other';
+
+		$select = new XmlSelect( $this->mName, $this->mID, $selected );
+		$select->addOptions( $this->getOptions() );
+
+		$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';
+		}
+
+		if ( isset( $this->mParams['tabindex'] ) ) {
+			$select->setAttribute( 'tabindex', $this->mParams['tabindex'] );
+			$tbAttribs['tabindex'] = $this->mParams['tabindex'];
+		}
+
+		$select = $select->getHTML();
+
+		if ( isset( $this->mParams['maxlength'] ) ) {
+			$tbAttribs['maxlength'] = $this->mParams['maxlength'];
+		}
+
+		if ( $this->mClass !== '' ) {
+			$tbAttribs['class'] = $this->mClass;
+		}
+
+		$textbox = Html::input( $this->mName . '-other', $valInSelect ? '' : $value, 'text', $tbAttribs );
+
+		return "$select<br />\n$textbox";
+	}
+
+	/**
+	 * @param WebRequest $request
+	 *
+	 * @return string
+	 */
+	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();
+		}
+	}
+}
diff --git a/includes/htmlform/HTMLSubmitField.php b/includes/htmlform/HTMLSubmitField.php
new file mode 100644
index 00000000..653c08c0
--- /dev/null
+++ b/includes/htmlform/HTMLSubmitField.php
@@ -0,0 +1,9 @@
+<?php
+
+/**
+ * Add a submit button inline in the form (as opposed to
+ * HTMLForm::addButton(), which will add it at the end).
+ */
+class HTMLSubmitField extends HTMLButtonField {
+	protected $buttonType = 'submit';
+}
diff --git a/includes/htmlform/HTMLTextAreaField.php b/includes/htmlform/HTMLTextAreaField.php
new file mode 100644
index 00000000..21173d2a
--- /dev/null
+++ b/includes/htmlform/HTMLTextAreaField.php
@@ -0,0 +1,38 @@
+<?php
+
+class HTMLTextAreaField extends HTMLFormField {
+	const DEFAULT_COLS = 80;
+	const DEFAULT_ROWS = 25;
+
+	function getCols() {
+		return isset( $this->mParams['cols'] ) ? $this->mParams['cols'] : static::DEFAULT_COLS;
+	}
+
+	function getRows() {
+		return isset( $this->mParams['rows'] ) ? $this->mParams['rows'] : static::DEFAULT_ROWS;
+	}
+
+	function getInputHTML( $value ) {
+		$attribs = array(
+				'id' => $this->mID,
+				'cols' => $this->getCols(),
+				'rows' => $this->getRows(),
+			) + $this->getTooltipAndAccessKey();
+
+		if ( $this->mClass !== '' ) {
+			$attribs['class'] = $this->mClass;
+		}
+
+		$allowedParams = array(
+			'placeholder',
+			'tabindex',
+			'disabled',
+			'readonly',
+			'required',
+			'autofocus'
+		);
+
+		$attribs += $this->getAttributes( $allowedParams );
+		return Html::textarea( $this->mName, $value, $attribs );
+	}
+}
diff --git a/includes/htmlform/HTMLTextField.php b/includes/htmlform/HTMLTextField.php
new file mode 100644
index 00000000..10bc67f0
--- /dev/null
+++ b/includes/htmlform/HTMLTextField.php
@@ -0,0 +1,65 @@
+<?php
+
+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 ( $this->mClass !== '' ) {
+			$attribs['class'] = $this->mClass;
+		}
+
+		# @todo Enforce pattern, step, required, readonly on the server side as
+		# well
+		$allowedParams = array(
+			'min',
+			'max',
+			'pattern',
+			'title',
+			'step',
+			'placeholder',
+			'list',
+			'maxlength',
+			'tabindex',
+			'disabled',
+			'required',
+			'autofocus',
+			'multiple',
+			'readonly'
+		);
+
+		$attribs += $this->getAttributes( $allowedParams );
+
+		# 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.
+		$type = 'text';
+		if ( isset( $this->mParams['type'] ) ) {
+			switch ( $this->mParams['type'] ) {
+				case 'int':
+					$type = 'number';
+					break;
+				case 'float':
+					$type = 'number';
+					$attribs['step'] = 'any';
+					break;
+				# Pass through
+				case 'email':
+				case 'password':
+				case 'file':
+				case 'url':
+					$type = $this->mParams['type'];
+					break;
+			}
+		}
+		return Html::input( $this->mName, $value, $type, $attribs );
+	}
+}