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[autoinstallsdev/mediawiki.git] / resources / src / mediawiki.special / mediawiki.special.apisandbox.js
diff --git a/resources/src/mediawiki.special/mediawiki.special.apisandbox.js b/resources/src/mediawiki.special/mediawiki.special.apisandbox.js
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+/* eslint-disable no-use-before-define */
+( function ( $, mw, OO ) {
+       'use strict';
+       var ApiSandbox, Util, WidgetMethods, Validators,
+               $content, panel, booklet, oldhash, windowManager, fullscreenButton,
+               formatDropdown,
+               api = new mw.Api(),
+               bookletPages = [],
+               availableFormats = {},
+               resultPage = null,
+               suppressErrors = true,
+               updatingBooklet = false,
+               pages = {},
+               moduleInfoCache = {},
+               baseRequestParams;
+
+       WidgetMethods = {
+               textInputWidget: {
+                       getApiValue: function () {
+                               return this.getValue();
+                       },
+                       setApiValue: function ( v ) {
+                               if ( v === undefined ) {
+                                       v = this.paramInfo[ 'default' ];
+                               }
+                               this.setValue( v );
+                       },
+                       apiCheckValid: function () {
+                               var that = this;
+                               return this.getValidity().then( function () {
+                                       return $.Deferred().resolve( true ).promise();
+                               }, function () {
+                                       return $.Deferred().resolve( false ).promise();
+                               } ).done( function ( ok ) {
+                                       ok = ok || suppressErrors;
+                                       that.setIcon( ok ? null : 'alert' );
+                                       that.setIconTitle( ok ? '' : mw.message( 'apisandbox-alert-field' ).plain() );
+                               } );
+                       }
+               },
+
+               dateTimeInputWidget: {
+                       getValidity: function () {
+                               if ( !Util.apiBool( this.paramInfo.required ) || this.getApiValue() !== '' ) {
+                                       return $.Deferred().resolve().promise();
+                               } else {
+                                       return $.Deferred().reject().promise();
+                               }
+                       }
+               },
+
+               tokenWidget: {
+                       alertTokenError: function ( code, error ) {
+                               windowManager.openWindow( 'errorAlert', {
+                                       title: Util.parseMsg( 'apisandbox-results-fixtoken-fail', this.paramInfo.tokentype ),
+                                       message: error,
+                                       actions: [
+                                               {
+                                                       action: 'accept',
+                                                       label: OO.ui.msg( 'ooui-dialog-process-dismiss' ),
+                                                       flags: 'primary'
+                                               }
+                                       ]
+                               } );
+                       },
+                       fetchToken: function () {
+                               this.pushPending();
+                               return api.getToken( this.paramInfo.tokentype )
+                                       .done( this.setApiValue.bind( this ) )
+                                       .fail( this.alertTokenError.bind( this ) )
+                                       .always( this.popPending.bind( this ) );
+                       },
+                       setApiValue: function ( v ) {
+                               WidgetMethods.textInputWidget.setApiValue.call( this, v );
+                               if ( v === '123ABC' ) {
+                                       this.fetchToken();
+                               }
+                       }
+               },
+
+               passwordWidget: {
+                       getApiValueForDisplay: function () {
+                               return '';
+                       }
+               },
+
+               toggleSwitchWidget: {
+                       getApiValue: function () {
+                               return this.getValue() ? 1 : undefined;
+                       },
+                       setApiValue: function ( v ) {
+                               this.setValue( Util.apiBool( v ) );
+                       },
+                       apiCheckValid: function () {
+                               return $.Deferred().resolve( true ).promise();
+                       }
+               },
+
+               dropdownWidget: {
+                       getApiValue: function () {
+                               var item = this.getMenu().getSelectedItem();
+                               return item === null ? undefined : item.getData();
+                       },
+                       setApiValue: function ( v ) {
+                               var menu = this.getMenu();
+
+                               if ( v === undefined ) {
+                                       v = this.paramInfo[ 'default' ];
+                               }
+                               if ( v === undefined ) {
+                                       menu.selectItem();
+                               } else {
+                                       menu.selectItemByData( String( v ) );
+                               }
+                       },
+                       apiCheckValid: function () {
+                               var ok = this.getApiValue() !== undefined || suppressErrors;
+                               this.setIcon( ok ? null : 'alert' );
+                               this.setIconTitle( ok ? '' : mw.message( 'apisandbox-alert-field' ).plain() );
+                               return $.Deferred().resolve( ok ).promise();
+                       }
+               },
+
+               capsuleWidget: {
+                       getApiValue: function () {
+                               var items = this.getItemsData();
+                               if ( items.join( '' ).indexOf( '|' ) === -1 ) {
+                                       return items.join( '|' );
+                               } else {
+                                       return '\x1f' + items.join( '\x1f' );
+                               }
+                       },
+                       setApiValue: function ( v ) {
+                               if ( v === undefined || v === '' || v === '\x1f' ) {
+                                       this.setItemsFromData( [] );
+                               } else {
+                                       v = String( v );
+                                       if ( v.indexOf( '\x1f' ) !== 0 ) {
+                                               this.setItemsFromData( v.split( '|' ) );
+                                       } else {
+                                               this.setItemsFromData( v.substr( 1 ).split( '\x1f' ) );
+                                       }
+                               }
+                       },
+                       apiCheckValid: function () {
+                               var ok = true,
+                                       pi = this.paramInfo;
+
+                               if ( !suppressErrors ) {
+                                       ok = this.getApiValue() !== undefined && !(
+                                               pi.allspecifier !== undefined &&
+                                               this.getItemsData().length > 1 &&
+                                               this.getItemsData().indexOf( pi.allspecifier ) !== -1
+                                       );
+                               }
+
+                               this.setIcon( ok ? null : 'alert' );
+                               this.setIconTitle( ok ? '' : mw.message( 'apisandbox-alert-field' ).plain() );
+                               return $.Deferred().resolve( ok ).promise();
+                       },
+                       createItemWidget: function ( data, label ) {
+                               var item = OO.ui.CapsuleMultiselectWidget.prototype.createItemWidget.call( this, data, label );
+                               if ( this.paramInfo.deprecatedvalues &&
+                                       this.paramInfo.deprecatedvalues.indexOf( data ) >= 0
+                               ) {
+                                       item.$element.addClass( 'apihelp-deprecated-value' );
+                               }
+                               return item;
+                       }
+               },
+
+               optionalWidget: {
+                       getApiValue: function () {
+                               return this.isDisabled() ? undefined : this.widget.getApiValue();
+                       },
+                       setApiValue: function ( v ) {
+                               this.setDisabled( v === undefined );
+                               this.widget.setApiValue( v );
+                       },
+                       apiCheckValid: function () {
+                               if ( this.isDisabled() ) {
+                                       return $.Deferred().resolve( true ).promise();
+                               } else {
+                                       return this.widget.apiCheckValid();
+                               }
+                       }
+               },
+
+               submoduleWidget: {
+                       single: function () {
+                               var v = this.isDisabled() ? this.paramInfo[ 'default' ] : this.getApiValue();
+                               return v === undefined ? [] : [ { value: v, path: this.paramInfo.submodules[ v ] } ];
+                       },
+                       multi: function () {
+                               var map = this.paramInfo.submodules,
+                                       v = this.isDisabled() ? this.paramInfo[ 'default' ] : this.getApiValue();
+                               return v === undefined || v === '' ? [] : $.map( String( v ).split( '|' ), function ( v ) {
+                                       return { value: v, path: map[ v ] };
+                               } );
+                       }
+               },
+
+               uploadWidget: {
+                       getApiValueForDisplay: function () {
+                               return '...';
+                       },
+                       getApiValue: function () {
+                               return this.getValue();
+                       },
+                       setApiValue: function () {
+                               // Can't, sorry.
+                       },
+                       apiCheckValid: function () {
+                               var ok = this.getValue() !== null || suppressErrors;
+                               this.setIcon( ok ? null : 'alert' );
+                               this.setIconTitle( ok ? '' : mw.message( 'apisandbox-alert-field' ).plain() );
+                               return $.Deferred().resolve( ok ).promise();
+                       }
+               }
+       };
+
+       Validators = {
+               generic: function () {
+                       return !Util.apiBool( this.paramInfo.required ) || this.getApiValue() !== '';
+               }
+       };
+
+       /**
+        * @class mw.special.ApiSandbox.Util
+        * @private
+        */
+       Util = {
+               /**
+                * Fetch API module info
+                *
+                * @param {string} module Module to fetch data for
+                * @return {jQuery.Promise}
+                */
+               fetchModuleInfo: function ( module ) {
+                       var apiPromise,
+                               deferred = $.Deferred();
+
+                       if ( moduleInfoCache.hasOwnProperty( module ) ) {
+                               return deferred
+                                       .resolve( moduleInfoCache[ module ] )
+                                       .promise( { abort: function () {} } );
+                       } else {
+                               apiPromise = api.post( {
+                                       action: 'paraminfo',
+                                       modules: module,
+                                       helpformat: 'html',
+                                       uselang: mw.config.get( 'wgUserLanguage' )
+                               } ).done( function ( data ) {
+                                       var info;
+
+                                       if ( data.warnings && data.warnings.paraminfo ) {
+                                               deferred.reject( '???', data.warnings.paraminfo[ '*' ] );
+                                               return;
+                                       }
+
+                                       info = data.paraminfo.modules;
+                                       if ( !info || info.length !== 1 || info[ 0 ].path !== module ) {
+                                               deferred.reject( '???', 'No module data returned' );
+                                               return;
+                                       }
+
+                                       moduleInfoCache[ module ] = info[ 0 ];
+                                       deferred.resolve( info[ 0 ] );
+                               } ).fail( function ( code, details ) {
+                                       if ( code === 'http' ) {
+                                               details = 'HTTP error: ' + details.exception;
+                                       } else if ( details.error ) {
+                                               details = details.error.info;
+                                       }
+                                       deferred.reject( code, details );
+                               } );
+                               return deferred
+                                       .promise( { abort: apiPromise.abort } );
+                       }
+               },
+
+               /**
+                * Mark all currently-in-use tokens as bad
+                */
+               markTokensBad: function () {
+                       var page, subpages, i,
+                               checkPages = [ pages.main ];
+
+                       while ( checkPages.length ) {
+                               page = checkPages.shift();
+
+                               if ( page.tokenWidget ) {
+                                       api.badToken( page.tokenWidget.paramInfo.tokentype );
+                               }
+
+                               subpages = page.getSubpages();
+                               for ( i = 0; i < subpages.length; i++ ) {
+                                       if ( pages.hasOwnProperty( subpages[ i ].key ) ) {
+                                               checkPages.push( pages[ subpages[ i ].key ] );
+                                       }
+                               }
+                       }
+               },
+
+               /**
+                * Test an API boolean
+                *
+                * @param {Mixed} value
+                * @return {boolean}
+                */
+               apiBool: function ( value ) {
+                       return value !== undefined && value !== false;
+               },
+
+               /**
+                * Create a widget for a parameter.
+                *
+                * @param {Object} pi Parameter info from API
+                * @param {Object} opts Additional options
+                * @return {OO.ui.Widget}
+                */
+               createWidgetForParameter: function ( pi, opts ) {
+                       var widget, innerWidget, finalWidget, items, $button, $content, func,
+                               multiMode = 'none';
+
+                       opts = opts || {};
+
+                       switch ( pi.type ) {
+                               case 'boolean':
+                                       widget = new OO.ui.ToggleSwitchWidget();
+                                       widget.paramInfo = pi;
+                                       $.extend( widget, WidgetMethods.toggleSwitchWidget );
+                                       pi.required = true; // Avoid wrapping in the non-required widget
+                                       break;
+
+                               case 'string':
+                               case 'user':
+                                       if ( pi.tokentype ) {
+                                               widget = new TextInputWithIndicatorWidget( {
+                                                       input: {
+                                                               indicator: 'previous',
+                                                               indicatorTitle: mw.message( 'apisandbox-fetch-token' ).text(),
+                                                               required: Util.apiBool( pi.required )
+                                                       }
+                                               } );
+                                       } else if ( Util.apiBool( pi.multi ) ) {
+                                               widget = new OO.ui.CapsuleMultiselectWidget( {
+                                                       allowArbitrary: true,
+                                                       allowDuplicates: Util.apiBool( pi.allowsduplicates ),
+                                                       $overlay: $( '#mw-apisandbox-ui' )
+                                               } );
+                                               widget.paramInfo = pi;
+                                               $.extend( widget, WidgetMethods.capsuleWidget );
+                                       } else {
+                                               widget = new OO.ui.TextInputWidget( {
+                                                       required: Util.apiBool( pi.required )
+                                               } );
+                                       }
+                                       if ( !Util.apiBool( pi.multi ) ) {
+                                               widget.paramInfo = pi;
+                                               $.extend( widget, WidgetMethods.textInputWidget );
+                                               widget.setValidation( Validators.generic );
+                                       }
+                                       if ( pi.tokentype ) {
+                                               $.extend( widget, WidgetMethods.tokenWidget );
+                                               widget.input.paramInfo = pi;
+                                               $.extend( widget.input, WidgetMethods.textInputWidget );
+                                               $.extend( widget.input, WidgetMethods.tokenWidget );
+                                               widget.on( 'indicator', widget.fetchToken, [], widget );
+                                       }
+                                       break;
+
+                               case 'text':
+                                       widget = new OO.ui.MultilineTextInputWidget( {
+                                               required: Util.apiBool( pi.required )
+                                       } );
+                                       widget.paramInfo = pi;
+                                       $.extend( widget, WidgetMethods.textInputWidget );
+                                       widget.setValidation( Validators.generic );
+                                       break;
+
+                               case 'password':
+                                       widget = new OO.ui.TextInputWidget( {
+                                               type: 'password',
+                                               required: Util.apiBool( pi.required )
+                                       } );
+                                       widget.paramInfo = pi;
+                                       $.extend( widget, WidgetMethods.textInputWidget );
+                                       $.extend( widget, WidgetMethods.passwordWidget );
+                                       widget.setValidation( Validators.generic );
+                                       multiMode = 'enter';
+                                       break;
+
+                               case 'integer':
+                                       widget = new OO.ui.NumberInputWidget( {
+                                               required: Util.apiBool( pi.required ),
+                                               isInteger: true
+                                       } );
+                                       widget.setIcon = widget.input.setIcon.bind( widget.input );
+                                       widget.setIconTitle = widget.input.setIconTitle.bind( widget.input );
+                                       widget.getValidity = widget.input.getValidity.bind( widget.input );
+                                       widget.paramInfo = pi;
+                                       $.extend( widget, WidgetMethods.textInputWidget );
+                                       if ( Util.apiBool( pi.enforcerange ) ) {
+                                               widget.setRange( pi.min || -Infinity, pi.max || Infinity );
+                                       }
+                                       multiMode = 'enter';
+                                       break;
+
+                               case 'limit':
+                                       widget = new OO.ui.TextInputWidget( {
+                                               required: Util.apiBool( pi.required )
+                                       } );
+                                       widget.setValidation( function ( value ) {
+                                               var n, pi = this.paramInfo;
+
+                                               if ( value === 'max' ) {
+                                                       return true;
+                                               } else {
+                                                       n = +value;
+                                                       return !isNaN( n ) && isFinite( n ) &&
+                                                               Math.floor( n ) === n &&
+                                                               n >= pi.min && n <= pi.apiSandboxMax;
+                                               }
+                                       } );
+                                       pi.min = pi.min || 0;
+                                       pi.apiSandboxMax = mw.config.get( 'apihighlimits' ) ? pi.highmax : pi.max;
+                                       widget.paramInfo = pi;
+                                       $.extend( widget, WidgetMethods.textInputWidget );
+                                       multiMode = 'enter';
+                                       break;
+
+                               case 'timestamp':
+                                       widget = new mw.widgets.datetime.DateTimeInputWidget( {
+                                               formatter: {
+                                                       format: '${year|0}-${month|0}-${day|0}T${hour|0}:${minute|0}:${second|0}${zone|short}'
+                                               },
+                                               required: Util.apiBool( pi.required ),
+                                               clearable: false
+                                       } );
+                                       widget.paramInfo = pi;
+                                       $.extend( widget, WidgetMethods.textInputWidget );
+                                       $.extend( widget, WidgetMethods.dateTimeInputWidget );
+                                       multiMode = 'indicator';
+                                       break;
+
+                               case 'upload':
+                                       widget = new OO.ui.SelectFileWidget();
+                                       widget.paramInfo = pi;
+                                       $.extend( widget, WidgetMethods.uploadWidget );
+                                       break;
+
+                               case 'namespace':
+                                       items = $.map( mw.config.get( 'wgFormattedNamespaces' ), function ( name, ns ) {
+                                               if ( ns === '0' ) {
+                                                       name = mw.message( 'blanknamespace' ).text();
+                                               }
+                                               return new OO.ui.MenuOptionWidget( { data: ns, label: name } );
+                                       } ).sort( function ( a, b ) {
+                                               return a.data - b.data;
+                                       } );
+                                       if ( Util.apiBool( pi.multi ) ) {
+                                               if ( pi.allspecifier !== undefined ) {
+                                                       items.unshift( new OO.ui.MenuOptionWidget( {
+                                                               data: pi.allspecifier,
+                                                               label: mw.message( 'apisandbox-multivalue-all-namespaces', pi.allspecifier ).text()
+                                                       } ) );
+                                               }
+
+                                               widget = new OO.ui.CapsuleMultiselectWidget( {
+                                                       menu: { items: items },
+                                                       $overlay: $( '#mw-apisandbox-ui' )
+                                               } );
+                                               widget.paramInfo = pi;
+                                               $.extend( widget, WidgetMethods.capsuleWidget );
+                                       } else {
+                                               widget = new OO.ui.DropdownWidget( {
+                                                       menu: { items: items },
+                                                       $overlay: $( '#mw-apisandbox-ui' )
+                                               } );
+                                               widget.paramInfo = pi;
+                                               $.extend( widget, WidgetMethods.dropdownWidget );
+                                       }
+                                       break;
+
+                               default:
+                                       if ( !Array.isArray( pi.type ) ) {
+                                               throw new Error( 'Unknown parameter type ' + pi.type );
+                                       }
+
+                                       items = $.map( pi.type, function ( v ) {
+                                               var config = {
+                                                       data: String( v ),
+                                                       label: String( v ),
+                                                       classes: []
+                                               };
+                                               if ( pi.deprecatedvalues && pi.deprecatedvalues.indexOf( v ) >= 0 ) {
+                                                       config.classes.push( 'apihelp-deprecated-value' );
+                                               }
+                                               return new OO.ui.MenuOptionWidget( config );
+                                       } );
+                                       if ( Util.apiBool( pi.multi ) ) {
+                                               if ( pi.allspecifier !== undefined ) {
+                                                       items.unshift( new OO.ui.MenuOptionWidget( {
+                                                               data: pi.allspecifier,
+                                                               label: mw.message( 'apisandbox-multivalue-all-values', pi.allspecifier ).text()
+                                                       } ) );
+                                               }
+
+                                               widget = new OO.ui.CapsuleMultiselectWidget( {
+                                                       menu: { items: items },
+                                                       $overlay: $( '#mw-apisandbox-ui' )
+                                               } );
+                                               widget.paramInfo = pi;
+                                               $.extend( widget, WidgetMethods.capsuleWidget );
+                                               if ( Util.apiBool( pi.submodules ) ) {
+                                                       widget.getSubmodules = WidgetMethods.submoduleWidget.multi;
+                                                       widget.on( 'change', ApiSandbox.updateUI );
+                                               }
+                                       } else {
+                                               widget = new OO.ui.DropdownWidget( {
+                                                       menu: { items: items },
+                                                       $overlay: $( '#mw-apisandbox-ui' )
+                                               } );
+                                               widget.paramInfo = pi;
+                                               $.extend( widget, WidgetMethods.dropdownWidget );
+                                               if ( Util.apiBool( pi.submodules ) ) {
+                                                       widget.getSubmodules = WidgetMethods.submoduleWidget.single;
+                                                       widget.getMenu().on( 'select', ApiSandbox.updateUI );
+                                               }
+                                               if ( pi.deprecatedvalues ) {
+                                                       widget.getMenu().on( 'select', function ( item ) {
+                                                               this.$element.toggleClass(
+                                                                       'apihelp-deprecated-value',
+                                                                       pi.deprecatedvalues.indexOf( item.data ) >= 0
+                                                               );
+                                                       }, [], widget );
+                                               }
+                                       }
+
+                                       break;
+                       }
+
+                       if ( Util.apiBool( pi.multi ) && multiMode !== 'none' ) {
+                               innerWidget = widget;
+                               switch ( multiMode ) {
+                                       case 'enter':
+                                               $content = innerWidget.$element;
+                                               break;
+
+                                       case 'indicator':
+                                               $button = innerWidget.$indicator;
+                                               $button.css( 'cursor', 'pointer' );
+                                               $button.attr( 'tabindex', 0 );
+                                               $button.parent().append( $button );
+                                               innerWidget.setIndicator( 'next' );
+                                               $content = innerWidget.$element;
+                                               break;
+
+                                       default:
+                                               throw new Error( 'Unknown multiMode "' + multiMode + '"' );
+                               }
+
+                               widget = new OO.ui.CapsuleMultiselectWidget( {
+                                       allowArbitrary: true,
+                                       allowDuplicates: Util.apiBool( pi.allowsduplicates ),
+                                       $overlay: $( '#mw-apisandbox-ui' ),
+                                       popup: {
+                                               classes: [ 'mw-apisandbox-popup' ],
+                                               $content: $content
+                                       }
+                               } );
+                               widget.paramInfo = pi;
+                               $.extend( widget, WidgetMethods.capsuleWidget );
+
+                               func = function () {
+                                       if ( !innerWidget.isDisabled() ) {
+                                               innerWidget.apiCheckValid().done( function ( ok ) {
+                                                       if ( ok ) {
+                                                               widget.addItemsFromData( [ innerWidget.getApiValue() ] );
+                                                               innerWidget.setApiValue( undefined );
+                                                       }
+                                               } );
+                                               return false;
+                                       }
+                               };
+                               switch ( multiMode ) {
+                                       case 'enter':
+                                               innerWidget.connect( null, { enter: func } );
+                                               break;
+
+                                       case 'indicator':
+                                               $button.on( {
+                                                       click: func,
+                                                       keypress: function ( e ) {
+                                                               if ( e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER ) {
+                                                                       func();
+                                                               }
+                                                       }
+                                               } );
+                                               break;
+                               }
+                       }
+
+                       if ( Util.apiBool( pi.required ) || opts.nooptional ) {
+                               finalWidget = widget;
+                       } else {
+                               finalWidget = new OptionalWidget( widget );
+                               finalWidget.paramInfo = pi;
+                               $.extend( finalWidget, WidgetMethods.optionalWidget );
+                               if ( widget.getSubmodules ) {
+                                       finalWidget.getSubmodules = widget.getSubmodules.bind( widget );
+                                       finalWidget.on( 'disable', function () { setTimeout( ApiSandbox.updateUI ); } );
+                               }
+                               finalWidget.setDisabled( true );
+                       }
+
+                       widget.setApiValue( pi[ 'default' ] );
+
+                       return finalWidget;
+               },
+
+               /**
+                * Parse an HTML string and call Util.fixupHTML()
+                *
+                * @param {string} html HTML to parse
+                * @return {jQuery}
+                */
+               parseHTML: function ( html ) {
+                       var $ret = $( $.parseHTML( html ) );
+                       return Util.fixupHTML( $ret );
+               },
+
+               /**
+                * Parse an i18n message and call Util.fixupHTML()
+                *
+                * @param {string} key Key of message to get
+                * @param {...Mixed} parameters Values for $N replacements
+                * @return {jQuery}
+                */
+               parseMsg: function () {
+                       var $ret = mw.message.apply( mw.message, arguments ).parseDom();
+                       return Util.fixupHTML( $ret );
+               },
+
+               /**
+                * Fix HTML for ApiSandbox display
+                *
+                * Fixes are:
+                * - Add target="_blank" to any links
+                *
+                * @param {jQuery} $html DOM to process
+                * @return {jQuery}
+                */
+               fixupHTML: function ( $html ) {
+                       $html.filter( 'a' ).add( $html.find( 'a' ) )
+                               .filter( '[href]:not([target])' )
+                               .attr( 'target', '_blank' );
+                       return $html;
+               },
+
+               /**
+                * Format a request and return a bunch of menu option widgets
+                *
+                * @param {Object} displayParams Query parameters, sanitized for display.
+                * @param {Object} rawParams Query parameters. You should probably use displayParams instead.
+                * @return {OO.ui.MenuOptionWidget[]} Each item's data should be an OO.ui.FieldLayout
+                */
+               formatRequest: function ( displayParams, rawParams ) {
+                       var jsonInput,
+                               items = [
+                                       new OO.ui.MenuOptionWidget( {
+                                               label: Util.parseMsg( 'apisandbox-request-format-url-label' ),
+                                               data: new OO.ui.FieldLayout(
+                                                       new OO.ui.TextInputWidget( {
+                                                               readOnly: true,
+                                                               value: mw.util.wikiScript( 'api' ) + '?' + $.param( displayParams )
+                                                       } ), {
+                                                               label: Util.parseMsg( 'apisandbox-request-url-label' )
+                                                       }
+                                               )
+                                       } ),
+                                       new OO.ui.MenuOptionWidget( {
+                                               label: Util.parseMsg( 'apisandbox-request-format-json-label' ),
+                                               data: new OO.ui.FieldLayout(
+                                                       jsonInput = new OO.ui.MultilineTextInputWidget( {
+                                                               classes: [ 'mw-apisandbox-textInputCode' ],
+                                                               readOnly: true,
+                                                               autosize: true,
+                                                               maxRows: 6,
+                                                               value: JSON.stringify( displayParams, null, '\t' )
+                                                       } ), {
+                                                               label: Util.parseMsg( 'apisandbox-request-json-label' )
+                                                       }
+                                               ).on( 'toggle', function ( visible ) {
+                                                       if ( visible ) {
+                                                               // Call updatePosition instead of adjustSize
+                                                               // because the latter has weird caching
+                                                               // behavior and the former bypasses it.
+                                                               jsonInput.updatePosition();
+                                                       }
+                                               } )
+                                       } )
+                               ];
+
+                       mw.hook( 'apisandbox.formatRequest' ).fire( items, displayParams, rawParams );
+
+                       return items;
+               },
+
+               /**
+                * Event handler for when formatDropdown's selection changes
+                */
+               onFormatDropdownChange: function () {
+                       var i,
+                               menu = formatDropdown.getMenu(),
+                               items = menu.getItems(),
+                               selectedField = menu.getSelectedItem() ? menu.getSelectedItem().getData() : null;
+
+                       for ( i = 0; i < items.length; i++ ) {
+                               items[ i ].getData().toggle( items[ i ].getData() === selectedField );
+                       }
+               }
+       };
+
+       /**
+       * Interface to ApiSandbox UI
+       *
+       * @class mw.special.ApiSandbox
+       */
+       ApiSandbox = {
+               /**
+                * Initialize the UI
+                *
+                * Automatically called on $.ready()
+                */
+               init: function () {
+                       var $toolbar;
+
+                       ApiSandbox.isFullscreen = false;
+
+                       $content = $( '#mw-apisandbox' );
+
+                       windowManager = new OO.ui.WindowManager();
+                       $( 'body' ).append( windowManager.$element );
+                       windowManager.addWindows( {
+                               errorAlert: new OO.ui.MessageDialog()
+                       } );
+
+                       fullscreenButton = new OO.ui.ButtonWidget( {
+                               label: mw.message( 'apisandbox-fullscreen' ).text(),
+                               title: mw.message( 'apisandbox-fullscreen-tooltip' ).text()
+                       } ).on( 'click', ApiSandbox.toggleFullscreen );
+
+                       $toolbar = $( '<div>' )
+                               .addClass( 'mw-apisandbox-toolbar' )
+                               .append(
+                                       fullscreenButton.$element,
+                                       new OO.ui.ButtonWidget( {
+                                               label: mw.message( 'apisandbox-submit' ).text(),
+                                               flags: [ 'primary', 'progressive' ]
+                                       } ).on( 'click', ApiSandbox.sendRequest ).$element,
+                                       new OO.ui.ButtonWidget( {
+                                               label: mw.message( 'apisandbox-reset' ).text(),
+                                               flags: 'destructive'
+                                       } ).on( 'click', ApiSandbox.resetUI ).$element
+                               );
+
+                       booklet = new OO.ui.BookletLayout( {
+                               outlined: true,
+                               autoFocus: false
+                       } );
+
+                       panel = new OO.ui.PanelLayout( {
+                               classes: [ 'mw-apisandbox-container' ],
+                               content: [ booklet ],
+                               expanded: false,
+                               framed: true
+                       } );
+
+                       pages.main = new ApiSandbox.PageLayout( { key: 'main', path: 'main' } );
+
+                       // Parse the current hash string
+                       if ( !ApiSandbox.loadFromHash() ) {
+                               ApiSandbox.updateUI();
+                       }
+
+                       // If the hashchange event exists, use it. Otherwise, fake it.
+                       // And, of course, IE has to be dumb.
+                       if ( 'onhashchange' in window &&
+                               ( document.documentMode === undefined || document.documentMode >= 8 )
+                       ) {
+                               $( window ).on( 'hashchange', ApiSandbox.loadFromHash );
+                       } else {
+                               setInterval( function () {
+                                       if ( oldhash !== location.hash ) {
+                                               ApiSandbox.loadFromHash();
+                                       }
+                               }, 1000 );
+                       }
+
+                       $content
+                               .empty()
+                               .append( $( '<p>' ).append( Util.parseMsg( 'apisandbox-intro' ) ) )
+                               .append(
+                                       $( '<div>', { id: 'mw-apisandbox-ui' } )
+                                               .append( $toolbar )
+                                               .append( panel.$element )
+                               );
+
+                       $( window ).on( 'resize', ApiSandbox.resizePanel );
+
+                       ApiSandbox.resizePanel();
+               },
+
+               /**
+                * Toggle "fullscreen" mode
+                */
+               toggleFullscreen: function () {
+                       var $body = $( document.body ),
+                               $ui = $( '#mw-apisandbox-ui' );
+
+                       ApiSandbox.isFullscreen = !ApiSandbox.isFullscreen;
+
+                       $body.toggleClass( 'mw-apisandbox-fullscreen', ApiSandbox.isFullscreen );
+                       $ui.toggleClass( 'mw-body-content', ApiSandbox.isFullscreen );
+                       if ( ApiSandbox.isFullscreen ) {
+                               fullscreenButton.setLabel( mw.message( 'apisandbox-unfullscreen' ).text() );
+                               fullscreenButton.setTitle( mw.message( 'apisandbox-unfullscreen-tooltip' ).text() );
+                               $body.append( $ui );
+                       } else {
+                               fullscreenButton.setLabel( mw.message( 'apisandbox-fullscreen' ).text() );
+                               fullscreenButton.setTitle( mw.message( 'apisandbox-fullscreen-tooltip' ).text() );
+                               $content.append( $ui );
+                       }
+                       ApiSandbox.resizePanel();
+               },
+
+               /**
+                * Set the height of the panel based on the current viewport.
+                */
+               resizePanel: function () {
+                       var height = $( window ).height(),
+                               contentTop = $content.offset().top;
+
+                       if ( ApiSandbox.isFullscreen ) {
+                               height -= panel.$element.offset().top - $( '#mw-apisandbox-ui' ).offset().top;
+                               panel.$element.height( height - 1 );
+                       } else {
+                               // Subtract the height of the intro text
+                               height -= panel.$element.offset().top - contentTop;
+
+                               panel.$element.height( height - 10 );
+                               $( window ).scrollTop( contentTop - 5 );
+                       }
+               },
+
+               /**
+                * Update the current query when the page hash changes
+                *
+                * @return {boolean} Successful
+                */
+               loadFromHash: function () {
+                       var params, m, re,
+                               hash = location.hash;
+
+                       if ( oldhash === hash ) {
+                               return false;
+                       }
+                       oldhash = hash;
+                       if ( hash === '' ) {
+                               return false;
+                       }
+
+                       // I'm surprised this doesn't seem to exist in jQuery or mw.util.
+                       params = {};
+                       hash = hash.replace( /\+/g, '%20' );
+                       re = /([^&=#]+)=?([^&#]*)/g;
+                       while ( ( m = re.exec( hash ) ) ) {
+                               params[ decodeURIComponent( m[ 1 ] ) ] = decodeURIComponent( m[ 2 ] );
+                       }
+
+                       ApiSandbox.updateUI( params );
+                       return true;
+               },
+
+               /**
+                * Update the pages in the booklet
+                *
+                * @param {Object} [params] Optional query parameters to load
+                */
+               updateUI: function ( params ) {
+                       var i, page, subpages, j, removePages,
+                               addPages = [];
+
+                       if ( !$.isPlainObject( params ) ) {
+                               params = undefined;
+                       }
+
+                       if ( updatingBooklet ) {
+                               return;
+                       }
+                       updatingBooklet = true;
+                       try {
+                               if ( params !== undefined ) {
+                                       pages.main.loadQueryParams( params );
+                               }
+                               addPages.push( pages.main );
+                               if ( resultPage !== null ) {
+                                       addPages.push( resultPage );
+                               }
+                               pages.main.apiCheckValid();
+
+                               i = 0;
+                               while ( addPages.length ) {
+                                       page = addPages.shift();
+                                       if ( bookletPages[ i ] !== page ) {
+                                               for ( j = i; j < bookletPages.length; j++ ) {
+                                                       if ( bookletPages[ j ].getName() === page.getName() ) {
+                                                               bookletPages.splice( j, 1 );
+                                                       }
+                                               }
+                                               bookletPages.splice( i, 0, page );
+                                               booklet.addPages( [ page ], i );
+                                       }
+                                       i++;
+
+                                       if ( page.getSubpages ) {
+                                               subpages = page.getSubpages();
+                                               for ( j = 0; j < subpages.length; j++ ) {
+                                                       if ( !pages.hasOwnProperty( subpages[ j ].key ) ) {
+                                                               subpages[ j ].indentLevel = page.indentLevel + 1;
+                                                               pages[ subpages[ j ].key ] = new ApiSandbox.PageLayout( subpages[ j ] );
+                                                       }
+                                                       if ( params !== undefined ) {
+                                                               pages[ subpages[ j ].key ].loadQueryParams( params );
+                                                       }
+                                                       addPages.splice( j, 0, pages[ subpages[ j ].key ] );
+                                                       pages[ subpages[ j ].key ].apiCheckValid();
+                                               }
+                                       }
+                               }
+
+                               if ( bookletPages.length > i ) {
+                                       removePages = bookletPages.splice( i, bookletPages.length - i );
+                                       booklet.removePages( removePages );
+                               }
+
+                               if ( !booklet.getCurrentPageName() ) {
+                                       booklet.selectFirstSelectablePage();
+                               }
+                       } finally {
+                               updatingBooklet = false;
+                       }
+               },
+
+               /**
+                * Reset button handler
+                */
+               resetUI: function () {
+                       suppressErrors = true;
+                       pages = {
+                               main: new ApiSandbox.PageLayout( { key: 'main', path: 'main' } )
+                       };
+                       resultPage = null;
+                       ApiSandbox.updateUI();
+               },
+
+               /**
+                * Submit button handler
+                *
+                * @param {Object} [params] Use this set of params instead of those in the form fields.
+                *   The form fields will be updated to match.
+                */
+               sendRequest: function ( params ) {
+                       var page, subpages, i, query, $result, $focus,
+                               progress, $progressText, progressLoading,
+                               deferreds = [],
+                               paramsAreForced = !!params,
+                               displayParams = {},
+                               checkPages = [ pages.main ];
+
+                       // Blur any focused widget before submit, because
+                       // OO.ui.ButtonWidget doesn't take focus itself (T128054)
+                       $focus = $( '#mw-apisandbox-ui' ).find( document.activeElement );
+                       if ( $focus.length ) {
+                               $focus[ 0 ].blur();
+                       }
+
+                       suppressErrors = false;
+
+                       // save widget state in params (or load from it if we are forced)
+                       if ( paramsAreForced ) {
+                               ApiSandbox.updateUI( params );
+                       }
+                       params = {};
+                       while ( checkPages.length ) {
+                               page = checkPages.shift();
+                               deferreds.push( page.apiCheckValid() );
+                               page.getQueryParams( params, displayParams );
+                               subpages = page.getSubpages();
+                               for ( i = 0; i < subpages.length; i++ ) {
+                                       if ( pages.hasOwnProperty( subpages[ i ].key ) ) {
+                                               checkPages.push( pages[ subpages[ i ].key ] );
+                                       }
+                               }
+                       }
+
+                       if ( !paramsAreForced ) {
+                               // forced params means we are continuing a query; the base query should be preserved
+                               baseRequestParams = $.extend( {}, params );
+                       }
+
+                       $.when.apply( $, deferreds ).done( function () {
+                               var formatItems, menu, selectedLabel;
+
+                               if ( $.inArray( false, arguments ) !== -1 ) {
+                                       windowManager.openWindow( 'errorAlert', {
+                                               title: Util.parseMsg( 'apisandbox-submit-invalid-fields-title' ),
+                                               message: Util.parseMsg( 'apisandbox-submit-invalid-fields-message' ),
+                                               actions: [
+                                                       {
+                                                               action: 'accept',
+                                                               label: OO.ui.msg( 'ooui-dialog-process-dismiss' ),
+                                                               flags: 'primary'
+                                                       }
+                                               ]
+                                       } );
+                                       return;
+                               }
+
+                               query = $.param( displayParams );
+
+                               formatItems = Util.formatRequest( displayParams, params );
+
+                               // Force a 'fm' format with wrappedhtml=1, if available
+                               if ( params.format !== undefined ) {
+                                       if ( availableFormats.hasOwnProperty( params.format + 'fm' ) ) {
+                                               params.format = params.format + 'fm';
+                                       }
+                                       if ( params.format.substr( -2 ) === 'fm' ) {
+                                               params.wrappedhtml = 1;
+                                       }
+                               }
+
+                               progressLoading = false;
+                               $progressText = $( '<span>' ).text( mw.message( 'apisandbox-sending-request' ).text() );
+                               progress = new OO.ui.ProgressBarWidget( {
+                                       progress: false,
+                                       $content: $progressText
+                               } );
+
+                               $result = $( '<div>' )
+                                       .append( progress.$element );
+
+                               resultPage = page = new OO.ui.PageLayout( '|results|' );
+                               page.setupOutlineItem = function () {
+                                       this.outlineItem.setLabel( mw.message( 'apisandbox-results' ).text() );
+                               };
+
+                               if ( !formatDropdown ) {
+                                       formatDropdown = new OO.ui.DropdownWidget( {
+                                               menu: { items: [] },
+                                               $overlay: $( '#mw-apisandbox-ui' )
+                                       } );
+                                       formatDropdown.getMenu().on( 'select', Util.onFormatDropdownChange );
+                               }
+
+                               menu = formatDropdown.getMenu();
+                               selectedLabel = menu.getSelectedItem() ? menu.getSelectedItem().getLabel() : '';
+                               if ( typeof selectedLabel !== 'string' ) {
+                                       selectedLabel = selectedLabel.text();
+                               }
+                               menu.clearItems().addItems( formatItems );
+                               menu.chooseItem( menu.getItemFromLabel( selectedLabel ) || menu.getFirstSelectableItem() );
+
+                               // Fire the event to update field visibilities
+                               Util.onFormatDropdownChange();
+
+                               page.$element.empty()
+                                       .append(
+                                               new OO.ui.FieldLayout(
+                                                       formatDropdown, {
+                                                               label: Util.parseMsg( 'apisandbox-request-selectformat-label' )
+                                                       }
+                                               ).$element,
+                                               $.map( formatItems, function ( item ) {
+                                                       return item.getData().$element;
+                                               } ),
+                                               $result
+                                       );
+                               ApiSandbox.updateUI();
+                               booklet.setPage( '|results|' );
+
+                               location.href = oldhash = '#' + query;
+
+                               api.post( params, {
+                                       contentType: 'multipart/form-data',
+                                       dataType: 'text',
+                                       xhr: function () {
+                                               var xhr = new window.XMLHttpRequest();
+                                               xhr.upload.addEventListener( 'progress', function ( e ) {
+                                                       if ( !progressLoading ) {
+                                                               if ( e.lengthComputable ) {
+                                                                       progress.setProgress( e.loaded * 100 / e.total );
+                                                               } else {
+                                                                       progress.setProgress( false );
+                                                               }
+                                                       }
+                                               } );
+                                               xhr.addEventListener( 'progress', function ( e ) {
+                                                       if ( !progressLoading ) {
+                                                               progressLoading = true;
+                                                               $progressText.text( mw.message( 'apisandbox-loading-results' ).text() );
+                                                       }
+                                                       if ( e.lengthComputable ) {
+                                                               progress.setProgress( e.loaded * 100 / e.total );
+                                                       } else {
+                                                               progress.setProgress( false );
+                                                       }
+                                               } );
+                                               return xhr;
+                                       }
+                               } )
+                                       .then( null, function ( code, data, result, jqXHR ) {
+                                               var deferred = $.Deferred();
+
+                                               if ( code !== 'http' ) {
+                                                       // Not really an error, work around mw.Api thinking it is.
+                                                       deferred.resolve( result, jqXHR );
+                                               } else {
+                                                       // Just forward it.
+                                                       deferred.reject.apply( deferred, arguments );
+                                               }
+                                               return deferred.promise();
+                                       } )
+                                       .then( function ( data, jqXHR ) {
+                                               var m, loadTime, button, clear,
+                                                       ct = jqXHR.getResponseHeader( 'Content-Type' ),
+                                                       loginSuppressed = jqXHR.getResponseHeader( 'MediaWiki-Login-Suppressed' ) || 'false';
+
+                                               $result.empty();
+                                               if ( loginSuppressed !== 'false' ) {
+                                                       $( '<div>' )
+                                                               .addClass( 'warning' )
+                                                               .append( Util.parseMsg( 'apisandbox-results-login-suppressed' ) )
+                                                               .appendTo( $result );
+                                               }
+                                               if ( /^text\/mediawiki-api-prettyprint-wrapped(?:;|$)/.test( ct ) ) {
+                                                       data = JSON.parse( data );
+                                                       if ( data.modules.length ) {
+                                                               mw.loader.load( data.modules );
+                                                       }
+                                                       if ( data.status && data.status !== 200 ) {
+                                                               $( '<div>' )
+                                                                       .addClass( 'api-pretty-header api-pretty-status' )
+                                                                       .append( Util.parseMsg( 'api-format-prettyprint-status', data.status, data.statustext ) )
+                                                                       .appendTo( $result );
+                                                       }
+                                                       $result.append( Util.parseHTML( data.html ) );
+                                                       loadTime = data.time;
+                                               } else if ( ( m = data.match( /<pre[ >][\s\S]*<\/pre>/ ) ) ) {
+                                                       $result.append( Util.parseHTML( m[ 0 ] ) );
+                                                       if ( ( m = data.match( /"wgBackendResponseTime":\s*(\d+)/ ) ) ) {
+                                                               loadTime = parseInt( m[ 1 ], 10 );
+                                                       }
+                                               } else {
+                                                       $( '<pre>' )
+                                                               .addClass( 'api-pretty-content' )
+                                                               .text( data )
+                                                               .appendTo( $result );
+                                               }
+                                               if ( paramsAreForced || data[ 'continue' ] ) {
+                                                       $result.append(
+                                                               $( '<div>' ).append(
+                                                                       new OO.ui.ButtonWidget( {
+                                                                               label: mw.message( 'apisandbox-continue' ).text()
+                                                                       } ).on( 'click', function () {
+                                                                               ApiSandbox.sendRequest( $.extend( {}, baseRequestParams, data[ 'continue' ] ) );
+                                                                       } ).setDisabled( !data[ 'continue' ] ).$element,
+                                                                       ( clear = new OO.ui.ButtonWidget( {
+                                                                               label: mw.message( 'apisandbox-continue-clear' ).text()
+                                                                       } ).on( 'click', function () {
+                                                                               ApiSandbox.updateUI( baseRequestParams );
+                                                                               clear.setDisabled( true );
+                                                                               booklet.setPage( '|results|' );
+                                                                       } ).setDisabled( !paramsAreForced ) ).$element,
+                                                                       new OO.ui.PopupButtonWidget( {
+                                                                               $overlay: $( '#mw-apisandbox-ui' ),
+                                                                               framed: false,
+                                                                               icon: 'info',
+                                                                               popup: {
+                                                                                       $content: $( '<div>' ).append( Util.parseMsg( 'apisandbox-continue-help' ) ),
+                                                                                       padded: true,
+                                                                                       width: 'auto'
+                                                                               }
+                                                                       } ).$element
+                                                               )
+                                                       );
+                                               }
+                                               if ( typeof loadTime === 'number' ) {
+                                                       $result.append(
+                                                               $( '<div>' ).append(
+                                                                       new OO.ui.LabelWidget( {
+                                                                               label: mw.message( 'apisandbox-request-time', loadTime ).text()
+                                                                       } ).$element
+                                                               )
+                                                       );
+                                               }
+
+                                               if ( jqXHR.getResponseHeader( 'MediaWiki-API-Error' ) === 'badtoken' ) {
+                                                       // Flush all saved tokens in case one of them is the bad one.
+                                                       Util.markTokensBad();
+                                                       button = new OO.ui.ButtonWidget( {
+                                                               label: mw.message( 'apisandbox-results-fixtoken' ).text()
+                                                       } );
+                                                       button.on( 'click', ApiSandbox.fixTokenAndResend )
+                                                               .on( 'click', button.setDisabled, [ true ], button )
+                                                               .$element.appendTo( $result );
+                                               }
+                                       }, function ( code, data ) {
+                                               var details = 'HTTP error: ' + data.exception;
+                                               $result.empty()
+                                                       .append(
+                                                               new OO.ui.LabelWidget( {
+                                                                       label: mw.message( 'apisandbox-results-error', details ).text(),
+                                                                       classes: [ 'error' ]
+                                                               } ).$element
+                                                       );
+                                       } );
+                       } );
+               },
+
+               /**
+                * Handler for the "Correct token and resubmit" button
+                *
+                * Used on a 'badtoken' error, it re-fetches token parameters for all
+                * pages and then re-submits the query.
+                */
+               fixTokenAndResend: function () {
+                       var page, subpages, i, k,
+                               ok = true,
+                               tokenWait = { dummy: true },
+                               checkPages = [ pages.main ],
+                               success = function ( k ) {
+                                       delete tokenWait[ k ];
+                                       if ( ok && $.isEmptyObject( tokenWait ) ) {
+                                               ApiSandbox.sendRequest();
+                                       }
+                               },
+                               failure = function ( k ) {
+                                       delete tokenWait[ k ];
+                                       ok = false;
+                               };
+
+                       while ( checkPages.length ) {
+                               page = checkPages.shift();
+
+                               if ( page.tokenWidget ) {
+                                       k = page.apiModule + page.tokenWidget.paramInfo.name;
+                                       tokenWait[ k ] = page.tokenWidget.fetchToken();
+                                       tokenWait[ k ]
+                                               .done( success.bind( page.tokenWidget, k ) )
+                                               .fail( failure.bind( page.tokenWidget, k ) );
+                               }
+
+                               subpages = page.getSubpages();
+                               for ( i = 0; i < subpages.length; i++ ) {
+                                       if ( pages.hasOwnProperty( subpages[ i ].key ) ) {
+                                               checkPages.push( pages[ subpages[ i ].key ] );
+                                       }
+                               }
+                       }
+
+                       success( 'dummy', '' );
+               },
+
+               /**
+                * Reset validity indicators for all widgets
+                */
+               updateValidityIndicators: function () {
+                       var page, subpages, i,
+                               checkPages = [ pages.main ];
+
+                       while ( checkPages.length ) {
+                               page = checkPages.shift();
+                               page.apiCheckValid();
+                               subpages = page.getSubpages();
+                               for ( i = 0; i < subpages.length; i++ ) {
+                                       if ( pages.hasOwnProperty( subpages[ i ].key ) ) {
+                                               checkPages.push( pages[ subpages[ i ].key ] );
+                                       }
+                               }
+                       }
+               }
+       };
+
+       /**
+        * PageLayout for API modules
+        *
+        * @class
+        * @private
+        * @extends OO.ui.PageLayout
+        * @constructor
+        * @param {Object} [config] Configuration options
+        */
+       ApiSandbox.PageLayout = function ( config ) {
+               config = $.extend( { prefix: '' }, config );
+               this.displayText = config.key;
+               this.apiModule = config.path;
+               this.prefix = config.prefix;
+               this.paramInfo = null;
+               this.apiIsValid = true;
+               this.loadFromQueryParams = null;
+               this.widgets = {};
+               this.tokenWidget = null;
+               this.indentLevel = config.indentLevel ? config.indentLevel : 0;
+               ApiSandbox.PageLayout[ 'super' ].call( this, config.key, config );
+               this.loadParamInfo();
+       };
+       OO.inheritClass( ApiSandbox.PageLayout, OO.ui.PageLayout );
+       ApiSandbox.PageLayout.prototype.setupOutlineItem = function () {
+               this.outlineItem.setLevel( this.indentLevel );
+               this.outlineItem.setLabel( this.displayText );
+               this.outlineItem.setIcon( this.apiIsValid || suppressErrors ? null : 'alert' );
+               this.outlineItem.setIconTitle(
+                       this.apiIsValid || suppressErrors ? '' : mw.message( 'apisandbox-alert-page' ).plain()
+               );
+       };
+
+       /**
+        * Fetch module information for this page's module, then create UI
+        */
+       ApiSandbox.PageLayout.prototype.loadParamInfo = function () {
+               var dynamicFieldset, dynamicParamNameWidget,
+                       that = this,
+                       removeDynamicParamWidget = function ( name, layout ) {
+                               dynamicFieldset.removeItems( [ layout ] );
+                               delete that.widgets[ name ];
+                       },
+                       addDynamicParamWidget = function () {
+                               var name, layout, widget, button;
+
+                               // Check name is filled in
+                               name = dynamicParamNameWidget.getValue().trim();
+                               if ( name === '' ) {
+                                       dynamicParamNameWidget.focus();
+                                       return;
+                               }
+
+                               if ( that.widgets[ name ] !== undefined ) {
+                                       windowManager.openWindow( 'errorAlert', {
+                                               title: Util.parseMsg( 'apisandbox-dynamic-error-exists', name ),
+                                               actions: [
+                                                       {
+                                                               action: 'accept',
+                                                               label: OO.ui.msg( 'ooui-dialog-process-dismiss' ),
+                                                               flags: 'primary'
+                                                       }
+                                               ]
+                                       } );
+                                       return;
+                               }
+
+                               widget = Util.createWidgetForParameter( {
+                                       name: name,
+                                       type: 'string',
+                                       'default': ''
+                               }, {
+                                       nooptional: true
+                               } );
+                               button = new OO.ui.ButtonWidget( {
+                                       icon: 'trash',
+                                       flags: 'destructive'
+                               } );
+                               layout = new OO.ui.ActionFieldLayout(
+                                       widget,
+                                       button,
+                                       {
+                                               label: name,
+                                               align: 'left'
+                                       }
+                               );
+                               button.on( 'click', removeDynamicParamWidget, [ name, layout ] );
+                               that.widgets[ name ] = widget;
+                               dynamicFieldset.addItems( [ layout ], dynamicFieldset.getItems().length - 1 );
+                               widget.focus();
+
+                               dynamicParamNameWidget.setValue( '' );
+                       };
+
+               this.$element.empty()
+                       .append( new OO.ui.ProgressBarWidget( {
+                               progress: false,
+                               text: mw.message( 'apisandbox-loading', this.displayText ).text()
+                       } ).$element );
+
+               Util.fetchModuleInfo( this.apiModule )
+                       .done( function ( pi ) {
+                               var prefix, i, j, descriptionContainer, widget, widgetField, helpField, tmp, flag, count,
+                                       items = [],
+                                       deprecatedItems = [],
+                                       buttons = [],
+                                       filterFmModules = function ( v ) {
+                                               return v.substr( -2 ) !== 'fm' ||
+                                                       !availableFormats.hasOwnProperty( v.substr( 0, v.length - 2 ) );
+                                       },
+                                       widgetLabelOnClick = function () {
+                                               var f = this.getField();
+                                               if ( $.isFunction( f.setDisabled ) ) {
+                                                       f.setDisabled( false );
+                                               }
+                                               if ( $.isFunction( f.focus ) ) {
+                                                       f.focus();
+                                               }
+                                       };
+
+                               // This is something of a hack. We always want the 'format' and
+                               // 'action' parameters from the main module to be specified,
+                               // and for 'format' we also want to simplify the dropdown since
+                               // we always send the 'fm' variant.
+                               if ( that.apiModule === 'main' ) {
+                                       for ( i = 0; i < pi.parameters.length; i++ ) {
+                                               if ( pi.parameters[ i ].name === 'action' ) {
+                                                       pi.parameters[ i ].required = true;
+                                                       delete pi.parameters[ i ][ 'default' ];
+                                               }
+                                               if ( pi.parameters[ i ].name === 'format' ) {
+                                                       tmp = pi.parameters[ i ].type;
+                                                       for ( j = 0; j < tmp.length; j++ ) {
+                                                               availableFormats[ tmp[ j ] ] = true;
+                                                       }
+                                                       pi.parameters[ i ].type = $.grep( tmp, filterFmModules );
+                                                       pi.parameters[ i ][ 'default' ] = 'json';
+                                                       pi.parameters[ i ].required = true;
+                                               }
+                                       }
+                               }
+
+                               // Hide the 'wrappedhtml' parameter on format modules
+                               if ( pi.group === 'format' ) {
+                                       pi.parameters = $.grep( pi.parameters, function ( p ) {
+                                               return p.name !== 'wrappedhtml';
+                                       } );
+                               }
+
+                               that.paramInfo = pi;
+
+                               items.push( new OO.ui.FieldLayout(
+                                       new OO.ui.Widget( {} ).toggle( false ), {
+                                               align: 'top',
+                                               label: Util.parseHTML( pi.description )
+                                       }
+                               ) );
+
+                               if ( pi.helpurls.length ) {
+                                       buttons.push( new OO.ui.PopupButtonWidget( {
+                                               $overlay: $( '#mw-apisandbox-ui' ),
+                                               label: mw.message( 'apisandbox-helpurls' ).text(),
+                                               icon: 'help',
+                                               popup: {
+                                                       width: 'auto',
+                                                       padded: true,
+                                                       $content: $( '<ul>' ).append( $.map( pi.helpurls, function ( link ) {
+                                                               return $( '<li>' ).append( $( '<a>', {
+                                                                       href: link,
+                                                                       target: '_blank',
+                                                                       text: link
+                                                               } ) );
+                                                       } ) )
+                                               }
+                                       } ) );
+                               }
+
+                               if ( pi.examples.length ) {
+                                       buttons.push( new OO.ui.PopupButtonWidget( {
+                                               $overlay: $( '#mw-apisandbox-ui' ),
+                                               label: mw.message( 'apisandbox-examples' ).text(),
+                                               icon: 'code',
+                                               popup: {
+                                                       width: 'auto',
+                                                       padded: true,
+                                                       $content: $( '<ul>' ).append( $.map( pi.examples, function ( example ) {
+                                                               var a = $( '<a>', {
+                                                                       href: '#' + example.query,
+                                                                       html: example.description
+                                                               } );
+                                                               a.find( 'a' ).contents().unwrap(); // Can't nest links
+                                                               return $( '<li>' ).append( a );
+                                                       } ) )
+                                               }
+                                       } ) );
+                               }
+
+                               if ( buttons.length ) {
+                                       items.push( new OO.ui.FieldLayout(
+                                               new OO.ui.ButtonGroupWidget( {
+                                                       items: buttons
+                                               } ), { align: 'top' }
+                                       ) );
+                               }
+
+                               if ( pi.parameters.length ) {
+                                       prefix = that.prefix + pi.prefix;
+                                       for ( i = 0; i < pi.parameters.length; i++ ) {
+                                               widget = Util.createWidgetForParameter( pi.parameters[ i ] );
+                                               that.widgets[ prefix + pi.parameters[ i ].name ] = widget;
+                                               if ( pi.parameters[ i ].tokentype ) {
+                                                       that.tokenWidget = widget;
+                                               }
+
+                                               descriptionContainer = $( '<div>' );
+
+                                               tmp = Util.parseHTML( pi.parameters[ i ].description );
+                                               tmp.filter( 'dl' ).makeCollapsible( {
+                                                       collapsed: true
+                                               } ).children( '.mw-collapsible-toggle' ).each( function () {
+                                                       var $this = $( this );
+                                                       $this.parent().prev( 'p' ).append( $this );
+                                               } );
+                                               descriptionContainer.append( $( '<div>', { addClass: 'description', append: tmp } ) );
+
+                                               if ( pi.parameters[ i ].info && pi.parameters[ i ].info.length ) {
+                                                       for ( j = 0; j < pi.parameters[ i ].info.length; j++ ) {
+                                                               descriptionContainer.append( $( '<div>', {
+                                                                       addClass: 'info',
+                                                                       append: Util.parseHTML( pi.parameters[ i ].info[ j ] )
+                                                               } ) );
+                                                       }
+                                               }
+                                               flag = true;
+                                               count = 1e100;
+                                               switch ( pi.parameters[ i ].type ) {
+                                                       case 'namespace':
+                                                               flag = false;
+                                                               count = mw.config.get( 'wgFormattedNamespaces' ).length;
+                                                               break;
+
+                                                       case 'limit':
+                                                               if ( pi.parameters[ i ].highmax !== undefined ) {
+                                                                       descriptionContainer.append( $( '<div>', {
+                                                                               addClass: 'info',
+                                                                               append: [
+                                                                                       Util.parseMsg(
+                                                                                               'api-help-param-limit2', pi.parameters[ i ].max, pi.parameters[ i ].highmax
+                                                                                       ),
+                                                                                       ' ',
+                                                                                       Util.parseMsg( 'apisandbox-param-limit' )
+                                                                               ]
+                                                                       } ) );
+                                                               } else {
+                                                                       descriptionContainer.append( $( '<div>', {
+                                                                               addClass: 'info',
+                                                                               append: [
+                                                                                       Util.parseMsg( 'api-help-param-limit', pi.parameters[ i ].max ),
+                                                                                       ' ',
+                                                                                       Util.parseMsg( 'apisandbox-param-limit' )
+                                                                               ]
+                                                                       } ) );
+                                                               }
+                                                               break;
+
+                                                       case 'integer':
+                                                               tmp = '';
+                                                               if ( pi.parameters[ i ].min !== undefined ) {
+                                                                       tmp += 'min';
+                                                               }
+                                                               if ( pi.parameters[ i ].max !== undefined ) {
+                                                                       tmp += 'max';
+                                                               }
+                                                               if ( tmp !== '' ) {
+                                                                       descriptionContainer.append( $( '<div>', {
+                                                                               addClass: 'info',
+                                                                               append: Util.parseMsg(
+                                                                                       'api-help-param-integer-' + tmp,
+                                                                                       Util.apiBool( pi.parameters[ i ].multi ) ? 2 : 1,
+                                                                                       pi.parameters[ i ].min, pi.parameters[ i ].max
+                                                                               )
+                                                                       } ) );
+                                                               }
+                                                               break;
+
+                                                       default:
+                                                               if ( Array.isArray( pi.parameters[ i ].type ) ) {
+                                                                       flag = false;
+                                                                       count = pi.parameters[ i ].type.length;
+                                                               }
+                                                               break;
+                                               }
+                                               if ( Util.apiBool( pi.parameters[ i ].multi ) ) {
+                                                       tmp = [];
+                                                       if ( flag && !( widget instanceof OO.ui.CapsuleMultiselectWidget ) &&
+                                                               !(
+                                                                       widget instanceof OptionalWidget &&
+                                                                       widget.widget instanceof OO.ui.CapsuleMultiselectWidget
+                                                               )
+                                                       ) {
+                                                               tmp.push( mw.message( 'api-help-param-multi-separate' ).parse() );
+                                                       }
+                                                       if ( count > pi.parameters[ i ].lowlimit ) {
+                                                               tmp.push(
+                                                                       mw.message( 'api-help-param-multi-max',
+                                                                               pi.parameters[ i ].lowlimit, pi.parameters[ i ].highlimit
+                                                                       ).parse()
+                                                               );
+                                                       }
+                                                       if ( tmp.length ) {
+                                                               descriptionContainer.append( $( '<div>', {
+                                                                       addClass: 'info',
+                                                                       append: Util.parseHTML( tmp.join( ' ' ) )
+                                                               } ) );
+                                                       }
+                                               }
+                                               helpField = new OO.ui.FieldLayout(
+                                                       new OO.ui.Widget( {
+                                                               $content: '\xa0',
+                                                               classes: [ 'mw-apisandbox-spacer' ]
+                                                       } ), {
+                                                               align: 'inline',
+                                                               classes: [ 'mw-apisandbox-help-field' ],
+                                                               label: descriptionContainer
+                                                       }
+                                               );
+
+                                               widgetField = new OO.ui.FieldLayout(
+                                                       widget,
+                                                       {
+                                                               align: 'left',
+                                                               classes: [ 'mw-apisandbox-widget-field' ],
+                                                               label: prefix + pi.parameters[ i ].name
+                                                       }
+                                               );
+
+                                               // We need our own click handler on the widget label to
+                                               // turn off the disablement.
+                                               widgetField.$label.on( 'click', widgetLabelOnClick.bind( widgetField ) );
+
+                                               // Don't grey out the label when the field is disabled,
+                                               // it makes it too hard to read and our "disabled"
+                                               // isn't really disabled.
+                                               widgetField.onFieldDisable( false );
+                                               widgetField.onFieldDisable = $.noop;
+
+                                               if ( Util.apiBool( pi.parameters[ i ].deprecated ) ) {
+                                                       deprecatedItems.push( widgetField, helpField );
+                                               } else {
+                                                       items.push( widgetField, helpField );
+                                               }
+                                       }
+                               }
+
+                               if ( !pi.parameters.length && !Util.apiBool( pi.dynamicparameters ) ) {
+                                       items.push( new OO.ui.FieldLayout(
+                                               new OO.ui.Widget( {} ).toggle( false ), {
+                                                       align: 'top',
+                                                       label: Util.parseMsg( 'apisandbox-no-parameters' )
+                                               }
+                                       ) );
+                               }
+
+                               that.$element.empty();
+
+                               new OO.ui.FieldsetLayout( {
+                                       label: that.displayText
+                               } ).addItems( items )
+                                       .$element.appendTo( that.$element );
+
+                               if ( Util.apiBool( pi.dynamicparameters ) ) {
+                                       dynamicFieldset = new OO.ui.FieldsetLayout();
+                                       dynamicParamNameWidget = new OO.ui.TextInputWidget( {
+                                               placeholder: mw.message( 'apisandbox-dynamic-parameters-add-placeholder' ).text()
+                                       } ).on( 'enter', addDynamicParamWidget );
+                                       dynamicFieldset.addItems( [
+                                               new OO.ui.FieldLayout(
+                                                       new OO.ui.Widget( {} ).toggle( false ), {
+                                                               align: 'top',
+                                                               label: Util.parseHTML( pi.dynamicparameters )
+                                                       }
+                                               ),
+                                               new OO.ui.ActionFieldLayout(
+                                                       dynamicParamNameWidget,
+                                                       new OO.ui.ButtonWidget( {
+                                                               icon: 'add',
+                                                               flags: 'progressive'
+                                                       } ).on( 'click', addDynamicParamWidget ),
+                                                       {
+                                                               label: mw.message( 'apisandbox-dynamic-parameters-add-label' ).text(),
+                                                               align: 'left'
+                                                       }
+                                               )
+                                       ] );
+                                       $( '<fieldset>' )
+                                               .append(
+                                                       $( '<legend>' ).text( mw.message( 'apisandbox-dynamic-parameters' ).text() ),
+                                                       dynamicFieldset.$element
+                                               )
+                                               .appendTo( that.$element );
+                               }
+
+                               if ( deprecatedItems.length ) {
+                                       tmp = new OO.ui.FieldsetLayout().addItems( deprecatedItems ).toggle( false );
+                                       $( '<fieldset>' )
+                                               .append(
+                                                       $( '<legend>' ).append(
+                                                               new OO.ui.ToggleButtonWidget( {
+                                                                       label: mw.message( 'apisandbox-deprecated-parameters' ).text()
+                                                               } ).on( 'change', tmp.toggle, [], tmp ).$element
+                                                       ),
+                                                       tmp.$element
+                                               )
+                                               .appendTo( that.$element );
+                               }
+
+                               // Load stored params, if any, then update the booklet if we
+                               // have subpages (or else just update our valid-indicator).
+                               tmp = that.loadFromQueryParams;
+                               that.loadFromQueryParams = null;
+                               if ( $.isPlainObject( tmp ) ) {
+                                       that.loadQueryParams( tmp );
+                               }
+                               if ( that.getSubpages().length > 0 ) {
+                                       ApiSandbox.updateUI( tmp );
+                               } else {
+                                       that.apiCheckValid();
+                               }
+                       } ).fail( function ( code, detail ) {
+                               that.$element.empty()
+                                       .append(
+                                               new OO.ui.LabelWidget( {
+                                                       label: mw.message( 'apisandbox-load-error', that.apiModule, detail ).text(),
+                                                       classes: [ 'error' ]
+                                               } ).$element,
+                                               new OO.ui.ButtonWidget( {
+                                                       label: mw.message( 'apisandbox-retry' ).text()
+                                               } ).on( 'click', that.loadParamInfo, [], that ).$element
+                                       );
+                       } );
+       };
+
+       /**
+        * Check that all widgets on the page are in a valid state.
+        *
+        * @return {boolean}
+        */
+       ApiSandbox.PageLayout.prototype.apiCheckValid = function () {
+               var that = this;
+
+               if ( this.paramInfo === null ) {
+                       return $.Deferred().resolve( false ).promise();
+               } else {
+                       return $.when.apply( $, $.map( this.widgets, function ( widget ) {
+                               return widget.apiCheckValid();
+                       } ) ).then( function () {
+                               that.apiIsValid = $.inArray( false, arguments ) === -1;
+                               if ( that.getOutlineItem() ) {
+                                       that.getOutlineItem().setIcon( that.apiIsValid || suppressErrors ? null : 'alert' );
+                                       that.getOutlineItem().setIconTitle(
+                                               that.apiIsValid || suppressErrors ? '' : mw.message( 'apisandbox-alert-page' ).plain()
+                                       );
+                               }
+                               return $.Deferred().resolve( that.apiIsValid ).promise();
+                       } );
+               }
+       };
+
+       /**
+        * Load form fields from query parameters
+        *
+        * @param {Object} params
+        */
+       ApiSandbox.PageLayout.prototype.loadQueryParams = function ( params ) {
+               if ( this.paramInfo === null ) {
+                       this.loadFromQueryParams = params;
+               } else {
+                       $.each( this.widgets, function ( name, widget ) {
+                               var v = params.hasOwnProperty( name ) ? params[ name ] : undefined;
+                               widget.setApiValue( v );
+                       } );
+               }
+       };
+
+       /**
+        * Load query params from form fields
+        *
+        * @param {Object} params Write query parameters into this object
+        * @param {Object} displayParams Write query parameters for display into this object
+        */
+       ApiSandbox.PageLayout.prototype.getQueryParams = function ( params, displayParams ) {
+               $.each( this.widgets, function ( name, widget ) {
+                       var value = widget.getApiValue();
+                       if ( value !== undefined ) {
+                               params[ name ] = value;
+                               if ( $.isFunction( widget.getApiValueForDisplay ) ) {
+                                       value = widget.getApiValueForDisplay();
+                               }
+                               displayParams[ name ] = value;
+                       }
+               } );
+       };
+
+       /**
+        * Fetch a list of subpage names loaded by this page
+        *
+        * @return {Array}
+        */
+       ApiSandbox.PageLayout.prototype.getSubpages = function () {
+               var ret = [];
+               $.each( this.widgets, function ( name, widget ) {
+                       var submodules, i;
+                       if ( $.isFunction( widget.getSubmodules ) ) {
+                               submodules = widget.getSubmodules();
+                               for ( i = 0; i < submodules.length; i++ ) {
+                                       ret.push( {
+                                               key: name + '=' + submodules[ i ].value,
+                                               path: submodules[ i ].path,
+                                               prefix: widget.paramInfo.submoduleparamprefix || ''
+                                       } );
+                               }
+                       }
+               } );
+               return ret;
+       };
+
+       /**
+        * A text input with a clickable indicator
+        *
+        * @class
+        * @private
+        * @constructor
+        * @param {Object} [config] Configuration options
+        */
+       function TextInputWithIndicatorWidget( config ) {
+               var k;
+
+               config = config || {};
+               TextInputWithIndicatorWidget[ 'super' ].call( this, config );
+
+               this.$indicator = $( '<span>' ).addClass( 'mw-apisandbox-clickable-indicator' );
+               OO.ui.mixin.TabIndexedElement.call(
+                       this, $.extend( {}, config, { $tabIndexed: this.$indicator } )
+               );
+
+               this.input = new OO.ui.TextInputWidget( $.extend( {
+                       $indicator: this.$indicator,
+                       disabled: this.isDisabled()
+               }, config.input ) );
+
+               // Forward most methods for convenience
+               for ( k in this.input ) {
+                       if ( $.isFunction( this.input[ k ] ) && !this[ k ] ) {
+                               this[ k ] = this.input[ k ].bind( this.input );
+                       }
+               }
+
+               this.$indicator.on( {
+                       click: this.onIndicatorClick.bind( this ),
+                       keypress: this.onIndicatorKeyPress.bind( this )
+               } );
+
+               this.$element.append( this.input.$element );
+       }
+       OO.inheritClass( TextInputWithIndicatorWidget, OO.ui.Widget );
+       OO.mixinClass( TextInputWithIndicatorWidget, OO.ui.mixin.TabIndexedElement );
+       TextInputWithIndicatorWidget.prototype.onIndicatorClick = function ( e ) {
+               if ( !this.isDisabled() && e.which === 1 ) {
+                       this.emit( 'indicator' );
+               }
+               return false;
+       };
+       TextInputWithIndicatorWidget.prototype.onIndicatorKeyPress = function ( e ) {
+               if ( !this.isDisabled() && ( e.which === OO.ui.Keys.SPACE || e.which === OO.ui.Keys.ENTER ) ) {
+                       this.emit( 'indicator' );
+                       return false;
+               }
+       };
+       TextInputWithIndicatorWidget.prototype.setDisabled = function ( disabled ) {
+               TextInputWithIndicatorWidget[ 'super' ].prototype.setDisabled.call( this, disabled );
+               if ( this.input ) {
+                       this.input.setDisabled( this.isDisabled() );
+               }
+               return this;
+       };
+
+       /**
+        * A wrapper for a widget that provides an enable/disable button
+        *
+        * @class
+        * @private
+        * @constructor
+        * @param {OO.ui.Widget} widget
+        * @param {Object} [config] Configuration options
+        */
+       function OptionalWidget( widget, config ) {
+               var k;
+
+               config = config || {};
+
+               this.widget = widget;
+               this.$overlay = config.$overlay ||
+                       $( '<div>' ).addClass( 'mw-apisandbox-optionalWidget-overlay' );
+               this.checkbox = new OO.ui.CheckboxInputWidget( config.checkbox )
+                       .on( 'change', this.onCheckboxChange, [], this );
+
+               OptionalWidget[ 'super' ].call( this, config );
+
+               // Forward most methods for convenience
+               for ( k in this.widget ) {
+                       if ( $.isFunction( this.widget[ k ] ) && !this[ k ] ) {
+                               this[ k ] = this.widget[ k ].bind( this.widget );
+                       }
+               }
+
+               this.$overlay.on( 'click', this.onOverlayClick.bind( this ) );
+
+               this.$element
+                       .addClass( 'mw-apisandbox-optionalWidget' )
+                       .append(
+                               this.$overlay,
+                               $( '<div>' ).addClass( 'mw-apisandbox-optionalWidget-fields' ).append(
+                                       $( '<div>' ).addClass( 'mw-apisandbox-optionalWidget-widget' ).append(
+                                               widget.$element
+                                       ),
+                                       $( '<div>' ).addClass( 'mw-apisandbox-optionalWidget-checkbox' ).append(
+                                               this.checkbox.$element
+                                       )
+                               )
+                       );
+
+               this.setDisabled( widget.isDisabled() );
+       }
+       OO.inheritClass( OptionalWidget, OO.ui.Widget );
+       OptionalWidget.prototype.onCheckboxChange = function ( checked ) {
+               this.setDisabled( !checked );
+       };
+       OptionalWidget.prototype.onOverlayClick = function () {
+               this.setDisabled( false );
+               if ( $.isFunction( this.widget.focus ) ) {
+                       this.widget.focus();
+               }
+       };
+       OptionalWidget.prototype.setDisabled = function ( disabled ) {
+               OptionalWidget[ 'super' ].prototype.setDisabled.call( this, disabled );
+               this.widget.setDisabled( this.isDisabled() );
+               this.checkbox.setSelected( !this.isDisabled() );
+               this.$overlay.toggle( this.isDisabled() );
+               return this;
+       };
+
+       $( ApiSandbox.init );
+
+       module.exports = ApiSandbox;
+
+}( jQuery, mediaWiki, OO ) );