MediaWiki:Gadget-morebits.js

// <nowiki>
/**
 * morebits.js
 * ===========
 * A library full of lots of goodness for user scripts on MediaWiki wikis, including Wikipedia.
 *
 * The highlights include:
 *   - Morebits.quickForm class - generates quick HTML forms on the fly
 *   - Morebits.wiki.api class - makes calls to the MediaWiki API
 *   - Morebits.wiki.page class - modifies pages on the wiki (edit, revert, delete, etc.)
 *   - Morebits.wikitext class - contains some utilities for dealing with wikitext
 *   - Morebits.status class - a rough-and-ready status message displayer, used by the Morebits.wiki classes
 *   - Morebits.simpleWindow class - a wrapper for jQuery UI Dialog with a custom look and extra features
 *
 * Dependencies:
 *   - The whole thing relies on jQuery.  But most wikis should provide this by default.
 *   - Morebits.quickForm, Morebits.simpleWindow, and Morebits.status rely on the "morebits.css" file for their styling.
 *   - Morebits.simpleWindow relies on jquery UI Dialog (ResourceLoader module name 'jquery.ui').
 *   - Morebits.quickForm tooltips rely on Tipsy (ResourceLoader module name 'jquery.tipsy').
 *     For external installations, Tipsy is available at [http://onehackoranother.com/projects/jquery/tipsy].
 *   - To create a gadget based on morebits.js, use this syntax in MediaWiki:Gadgets-definition:
 *       * GadgetName[ResourceLoader|dependencies=mediawiki.util,jquery.ui,jquery.tipsy]|morebits.js|morebits.css|GadgetName.js
 *
 * Most of the stuff here doesn't work on IE < 9.  It is your script's responsibility to enforce this.
 *
 * This library is maintained by the maintainers of Twinkle.
 * For queries, suggestions, help, etc., head to [[Wikipedia talk:Twinkle]] on English Wikipedia [http://en.wikipedia.org].
 * The latest development source is available at [https://github.com/azatoth/twinkle/blob/master/morebits.js].
 */


( function ( window, document, $, undefined ) { // Wrap entire file with anonymous function

var Morebits = {};
window.Morebits = Morebits;  // allow global access



/**
 * **************** Morebits.userIsInGroup() ****************
 * Simple helper function to see what groups a user might belong
 */

Morebits.userIsInGroup = function ( group ) {
	return $.inArray(group, mw.config.get( 'wgUserGroups' )) !== -1;
}



/**
 * **************** Morebits.isIPAddress() ****************
 * Helper function: Returns true if given string contains a valid IPv4 or
 * IPv6 address
 */

Morebits.isIPAddress = function ( address ) {
	return mw.util.isIPv4Address(address) || mw.util.isIPv6Address(address);
};



/**
 * **************** Morebits.sanitizeIPv6() ****************
 * JavaScript translation of the MediaWiki core function IP::sanitizeIP() in
 * includes/utils/IP.php.
 * Converts an IPv6 address to the canonical form stored and used by MediaWiki.
 */

Morebits.sanitizeIPv6 = function ( address ) {
	address = address.trim();
	if ( address === '' ) {
		return null;
	}
	if ( mw.util.isIPv4Address( address ) || !mw.util.isIPv6Address( address ) ) {
		return address; // nothing else to do for IPv4 addresses or invalid ones
	}
	// Remove any whitespaces, convert to upper case
	address = address.toUpperCase();
	// Expand zero abbreviations
	var abbrevPos = address.indexOf( '::' );
	if ( abbrevPos > -1 ) {
		// We know this is valid IPv6. Find the last index of the
		// address before any CIDR number (e.g. "a:b:c::/24").
		var CIDRStart = address.indexOf( '/' );
		var addressEnd = ( CIDRStart > -1 ) ? CIDRStart - 1 : address.length - 1;
		// If the '::' is at the beginning...
		var repeat, extra, pad;
		if ( abbrevPos === 0 ) {
			repeat = '0:';
			extra = ( address == '::' ) ? '0' : ''; // for the address '::'
			pad = 9; // 7+2 (due to '::')
		// If the '::' is at the end...
		} else if ( abbrevPos === ( addressEnd - 1 ) ) {
			repeat = ':0';
			extra = '';
			pad = 9; // 7+2 (due to '::')
		// If the '::' is in the middle...
		} else {
			repeat = ':0';
			extra = ':';
			pad = 8; // 6+2 (due to '::')
		}
		var replacement = repeat;
		pad -= address.split( ':' ).length - 1;
		for ( var i = 1; i < pad; i++ ) {
			replacement += repeat;
		}
		replacement += extra;
		address = address.replace( '::', replacement );
	}
	// Remove leading zeros from each bloc as needed
	address = address.replace( /(^|:)0+([0-9A-Fa-f]{1,4})/g, '$1$2' );

	return address;
};



/**
 * **************** Morebits.quickForm ****************
 * Morebits.quickForm is a class for creation of simple and standard forms without much 
 * specific coding.
 *
 * Index to Morebits.quickForm element types:
 *
 *   select    A combo box (aka drop-down).
 *              - Attributes: name, label, multiple, size, list, event
 *   option    An element for a combo box.
 *              - Attributes: value, label, selected, disabled
 *   optgroup  A group of "option"s.
 *              - Attributes: label, list
 *   field     A fieldset (aka group box).
 *              - Attributes: name, label
 *   checkbox  A checkbox. Must use "list" parameter.
 *              - Attributes: name, list, event
 *              - Attributes (within list): name, label, value, checked, disabled, event, subgroup
 *   radio     A radio button. Must use "list" parameter.
 *              - Attributes: name, list, event
 *              - Attributes (within list): name, label, value, checked, disabled, event, subgroup
 *   input     A text box.
 *              - Attributes: name, label, value, size, disabled, readonly, maxlength, event
 *   dyninput  A set of text boxes with "Remove" buttons and an "Add" button.
 *              - Attributes: name, label, min, max, sublabel, value, size, maxlength, event
 *   hidden    An invisible form field.
 *              - Attributes: name, value
 *   header    A level 5 header.
 *              - Attributes: label
 *   div       A generic placeholder element or label.
 *              - Attributes: name, label
 *   submit    A submit button. Morebits.simpleWindow moves these to the footer of the dialog.
 *              - Attributes: name, label, disabled
 *   button    A generic button.
 *              - Attributes: name, label, disabled, event
 *   textarea  A big, multi-line text box.
 *              - Attributes: name, label, value, cols, rows, disabled, readonly
 *
 * Global attributes: id, style, tooltip, extra, adminonly
 */

Morebits.quickForm = function QuickForm( event, eventType ) {
	this.root = new Morebits.quickForm.element( { type: 'form', event: event, eventType:eventType } );
};

Morebits.quickForm.prototype.render = function QuickFormRender() {
	var ret = this.root.render();
	ret.names = {};
	return ret;
};

Morebits.quickForm.prototype.append = function QuickFormAppend( data ) {
	return this.root.append( data );
};

Morebits.quickForm.element = function QuickFormElement( data ) {
	this.data = data;
	this.childs = [];
	this.id = Morebits.quickForm.element.id++;
};

Morebits.quickForm.element.id = 0;

Morebits.quickForm.element.prototype.append = function QuickFormElementAppend( data ) {
	var child;
	if( data instanceof Morebits.quickForm.element ) {
		child = data;
	} else {
		child = new Morebits.quickForm.element( data );
	}
	this.childs.push( child );
	return child;
};

// This should be called without parameters: form.render()
Morebits.quickForm.element.prototype.render = function QuickFormElementRender( internal_subgroup_id ) {
	var currentNode = this.compute( this.data, internal_subgroup_id );

	for( var i = 0; i < this.childs.length; ++i ) {
		// do not pass internal_subgroup_id to recursive calls
		currentNode[1].appendChild( this.childs[i].render() );
	}
	return currentNode[0];
};

Morebits.quickForm.element.prototype.compute = function QuickFormElementCompute( data, in_id ) {
	var node;
	var childContainder = null;
	var label;
	var id = ( in_id ? in_id + '_' : '' ) + 'node_' + this.id;
	if( data.adminonly && !Morebits.userIsInGroup( 'sysop' ) ) {
		// hell hack alpha
		data.type = 'hidden';
	}

	var i, current, subnode;
	switch( data.type ) {
	case 'form':
		node = document.createElement( 'form' );
		node.className = "quickform";
		node.setAttribute( 'action', 'javascript:void(0);');
		if( data.event ) {
			node.addEventListener( data.eventType || 'submit', data.event , false );
		}
		break;
	case 'select':
		node = document.createElement( 'div' );

		node.setAttribute( 'id', 'div_' + id );
		if( data.label ) {
			label = node.appendChild( document.createElement( 'label' ) );
			label.setAttribute( 'for', id );
			label.appendChild( document.createTextNode( data.label ) );
		}
		var select = node.appendChild( document.createElement( 'select' ) );
		if( data.event ) {
			select.addEventListener( 'change', data.event, false );
		}
		if( data.multiple ) {
			select.setAttribute( 'multiple', 'multiple' );
		}
		if( data.size ) {
			select.setAttribute( 'size', data.size );
		}
		select.setAttribute( 'name', data.name );

		if( data.list ) {
			for( i = 0; i < data.list.length; ++i ) {

				current = data.list[i];

				if( current.list ) {
					current.type = 'optgroup';
				} else {
					current.type = 'option';
				}

				subnode = this.compute( current );
				select.appendChild( subnode[0] );
			}
		}
		childContainder = select;
		break;
	case 'option':
		node = document.createElement( 'option' );
		node.values = data.value;
		node.setAttribute( 'value', data.value );
		if( data.selected ) {
			node.setAttribute( 'selected', 'selected' );
		}
		if( data.disabled ) {
			node.setAttribute( 'disabled', 'disabled' );
		}
		node.setAttribute( 'label', data.label );
		node.appendChild( document.createTextNode( data.label ) );
		break;
	case 'optgroup':
		node = document.createElement( 'optgroup' );
		node.setAttribute( 'label', data.label );

		if( data.list ) {
			for( i = 0; i < data.list.length; ++i ) {

				current = data.list[i];
				current.type = 'option'; //must be options here

				subnode = this.compute( current );
				node.appendChild( subnode[0] );
			}
		}
		break;
	case 'field':
		node = document.createElement( 'fieldset' );
		label = node.appendChild( document.createElement( 'legend' ) );
		label.appendChild( document.createTextNode( data.label ) );
		if( data.name ) {
			node.setAttribute( 'name', data.name );
		}
		break;
	case 'checkbox':
	case 'radio':
		node = document.createElement( 'div' );
		if( data.list ) {
			for( i = 0; i < data.list.length; ++i ) {
				var cur_id = id + '_' + i;
				current = data.list[i];
				var cur_div;
				if( current.type === 'header' ) {
					// inline hack
					cur_div = node.appendChild( document.createElement( 'h6' ) );
					cur_div.appendChild( document.createTextNode( current.label ) );
					if( current.tooltip ) {
						Morebits.quickForm.element.generateTooltip( cur_div , current );
					}
					continue;
				}
				cur_div = node.appendChild( document.createElement( 'div' ) );
				subnode = cur_div.appendChild( document.createElement( 'input' ) );
				subnode.values = current.value;
				subnode.setAttribute( 'value', current.value );
				subnode.setAttribute( 'name', current.name || data.name );
				subnode.setAttribute( 'type', data.type );
				subnode.setAttribute( 'id', cur_id );

				if( current.checked ) {
					subnode.setAttribute( 'checked', 'checked' );
				}
				if( current.disabled ) {
					subnode.setAttribute( 'disabled', 'disabled' );
				}
				if( data.event ) {
					subnode.addEventListener( 'change', data.event, false );
				} else if ( current.event ) {
					subnode.addEventListener( 'change', current.event, true );
				}
				label = cur_div.appendChild( document.createElement( 'label' ) );
				label.appendChild( document.createTextNode( current.label ) );
				label.setAttribute( 'for', cur_id );
				if( current.tooltip ) {
					Morebits.quickForm.element.generateTooltip( label, current );
				}
				var event;
				if( current.subgroup ) {
					var tmpgroup = current.subgroup;  // $.extend({}, current.subgroup); really needed?

					if( ! $.isArray( tmpgroup ) ) {
						tmpgroup = [ tmpgroup ];
					}

					var subgroupRaw = new Morebits.quickForm.element({
						type: 'div', 
						id: id + '_' + i + '_subgroup'
					});
					$.each( tmpgroup, function( idx, el ) {
						if( ! el.type ) {
							el.type = data.type;
						}
						el.name = (current.name || data.name) + '.' + el.name;
						subgroupRaw.append( el );
					} );
					
					var subgroup = subgroupRaw.render( cur_id );
					subgroup.className = "quickformSubgroup";
					subnode.subgroup = subgroup;
					subnode.shown = false;

					event = function(e) {
						if( e.target.checked ) {
							e.target.parentNode.appendChild( e.target.subgroup );
							if( e.target.type === 'radio' ) {
								var name = e.target.name;
								if( e.target.form.names[name] !== undefined ) {
									e.target.form.names[name].parentNode.removeChild( e.target.form.names[name].subgroup );
								}
								e.target.form.names[name] = e.target;
							}
						} else {
							e.target.parentNode.removeChild( e.target.subgroup );
						}
					};
					subnode.addEventListener( 'change', event, true );
					if( current.checked ) {
						subnode.parentNode.appendChild( subgroup );
					}
				} else if( data.type === 'radio' ) {
					event = function(e) {
						if( e.target.checked ) {
							var name = e.target.name;
							if( e.target.form.names[name] !== undefined ) {
								e.target.form.names[name].parentNode.removeChild( e.target.form.names[name].subgroup );
							}
							delete e.target.form.names[name];
						} 
					};
					subnode.addEventListener( 'change', event, true );
				}
			}
		}
		break;
	case 'input':
		node = document.createElement( 'div' );
		node.setAttribute( 'id', 'div_' + id );

		if( data.label ) {
			label = node.appendChild( document.createElement( 'label' ) );
			label.appendChild( document.createTextNode( data.label ) );
			label.setAttribute( 'for', id );
		}

		subnode = node.appendChild( document.createElement( 'input' ) );
		if( data.value ) {
			subnode.setAttribute( 'value', data.value );
		}
		subnode.setAttribute( 'name', data.name );
		subnode.setAttribute( 'id', id );
		subnode.setAttribute( 'type', 'text' );
		if( data.size ) {
			subnode.setAttribute( 'size', data.size );
		}
		if( data.disabled ) {
			subnode.setAttribute( 'disabled', 'disabled' );
		}
		if( data.readonly ) {
			subnode.setAttribute( 'readonly', 'readonly' );
		}
		if( data.maxlength ) {
			subnode.setAttribute( 'maxlength', data.maxlength );
		}
		if( data.event ) {
			subnode.addEventListener( 'keyup', data.event, false );
		}
		break;
	case 'dyninput':
		var min = data.min || 1;
		var max = data.max || Infinity;

		node = document.createElement( 'div' );

		label = node.appendChild( document.createElement( 'h5' ) );
		label.appendChild( document.createTextNode( data.label ) );

		var listNode = node.appendChild( document.createElement( 'div' ) );

		var more = this.compute( {
				type: 'button',
				label: 'more',
				disabled: min >= max,
				event: function(e) {
					var area = e.target.area;
					var new_node =  new Morebits.quickForm.element( e.target.sublist );
					e.target.area.appendChild( new_node.render() );

					if( ++e.target.counter >= e.target.max ) {
						e.target.setAttribute( 'disabled', 'disabled' );
					}
					e.stopPropagation();
				}
			} );

		node.appendChild( more[0] );
		var moreButton = more[1];

		var sublist = {
			type: '_dyninput_element',
			label: data.sublabel || data.label,
			name: data.name,
			value: data.value,
			size: data.size,
			remove: false,
			maxlength: data.maxlength,
			event: data.event
		};

		for( i = 0; i < min; ++i ) {
			var elem = new Morebits.quickForm.element( sublist );
			listNode.appendChild( elem.render() );
		}
		sublist.remove = true;
		sublist.morebutton = moreButton;
		sublist.listnode = listNode;

		moreButton.sublist = sublist;
		moreButton.area = listNode;
		moreButton.max = max - min;
		moreButton.counter = 0;
		break;
	case '_dyninput_element': // Private, similar to normal input
		node = document.createElement( 'div' );

		if( data.label ) {
			label = node.appendChild( document.createElement( 'label' ) );
			label.appendChild( document.createTextNode( data.label ) );
			label.setAttribute( 'for', id );
		}

		subnode = node.appendChild( document.createElement( 'input' ) );
		if( data.value ) {
			subnode.setAttribute( 'value', data.value );
		}
		subnode.setAttribute( 'name', data.name );
		subnode.setAttribute( 'type', 'text' );
		if( data.size ) {
			subnode.setAttribute( 'size', data.size );
		}
		if( data.maxlength ) {
			subnode.setAttribute( 'maxlength', data.maxlength );
		}
		if( data.event ) {
			subnode.addEventListener( 'keyup', data.event, false );
		}
		if( data.remove ) {
			var remove = this.compute( {
					type: 'button',
					label: 'remove',
					event: function(e) {
						var list = e.target.listnode;
						var node = e.target.inputnode;
						var more = e.target.morebutton;

						list.removeChild( node );
						--more.counter;
						more.removeAttribute( 'disabled' );
						e.stopPropagation();
					}
				} );
			node.appendChild( remove[0] );
			var removeButton = remove[1];
			removeButton.inputnode = node;
			removeButton.listnode = data.listnode;
			removeButton.morebutton = data.morebutton;
		}
		break;
	case 'hidden':
		node = document.createElement( 'input' );
		node.setAttribute( 'type', 'hidden' );
		node.values = data.value;
		node.setAttribute( 'value', data.value );
		node.setAttribute( 'name', data.name );
		break;
	case 'header':
		node = document.createElement( 'h5' );
		node.appendChild( document.createTextNode( data.label ) );
		break;
	case 'div':
		node = document.createElement( 'div' );
		if (data.name) {
			node.setAttribute( 'name', data.name );
		}
		if (data.label) {
			if ( ! $.isArray( data.label ) ) {
				data.label = [ data.label ];
			}
			var result = document.createElement( 'span' );
			result.className = 'quickformDescription';
			for( i = 0; i < data.label.length; ++i ) {
				if( typeof data.label[i] === 'string' ) {
					result.appendChild( document.createTextNode( data.label[i] ) );
				} else if( data.label[i] instanceof Element ) {
					result.appendChild( data.label[i] );
				}
			}
			node.appendChild( result );
		}
		break;
	case 'submit':
		node = document.createElement( 'span' );
		childContainder = node.appendChild(document.createElement( 'input' ));
		childContainder.setAttribute( 'type', 'submit' );
		if( data.label ) {
			childContainder.setAttribute( 'value', data.label );
		}
		childContainder.setAttribute( 'name', data.name || 'submit' );
		if( data.disabled ) {
			childContainder.setAttribute( 'disabled', 'disabled' );
		}
		break;
	case 'button':
		node = document.createElement( 'span' );
		childContainder = node.appendChild(document.createElement( 'input' ));
		childContainder.setAttribute( 'type', 'button' );
		if( data.label ) {
			childContainder.setAttribute( 'value', data.label );
		}
		childContainder.setAttribute( 'name', data.name );
		if( data.disabled ) {
			childContainder.setAttribute( 'disabled', 'disabled' );
		}
		if( data.event ) {
			childContainder.addEventListener( 'click', data.event, false );
		}
		break;
	case 'textarea':
		node = document.createElement( 'div' );
		node.setAttribute( 'id', 'div_' + id );
		if( data.label ) {
			label = node.appendChild( document.createElement( 'h5' ) );
			label.appendChild( document.createTextNode( data.label ) );
			// TODO need to nest a <label> tag in here without creating extra vertical space
			//label.setAttribute( 'for', id );
		}
		subnode = node.appendChild( document.createElement( 'textarea' ) );
		subnode.setAttribute( 'name', data.name );
		if( data.cols ) {
			subnode.setAttribute( 'cols', data.cols );
		}
		if( data.rows ) {
			subnode.setAttribute( 'rows', data.rows );
		}
		if( data.disabled ) {
			subnode.setAttribute( 'disabled', 'disabled' );
		}
		if( data.readonly ) {
			subnode.setAttribute( 'readonly', 'readonly' );
		}
		if( data.value ) {
			subnode.value = data.value;
		}
		break;
	default:
		throw new Error("Morebits.quickForm: unknown element type " + data.type.toString());
	}

	if( !childContainder ) {
		childContainder = node;
	} 
	if( data.tooltip ) {
		Morebits.quickForm.element.generateTooltip( label || node , data );
	}

	if( data.extra ) {
		childContainder.extra = data.extra;
	}
	if( data.style ) {
		childContainder.setAttribute( 'style', data.style );
	}
	childContainder.setAttribute( 'id', data.id || id );

	return [ node, childContainder ];
};

Morebits.quickForm.element.generateTooltip = function QuickFormElementGenerateTooltip( node, data ) {
	$('<span/>', {
			'class': 'ui-icon ui-icon-help ui-icon-inline morebits-tooltip'
		}).appendTo(node).tipsy({
			'fallback': data.tooltip,
			'fade': true,
			'gravity': $.fn.tipsy.autoWE,
			'html': true,
			'delayOut': 250
		});
};

/**
 * Some utility methods for manipulating quickForms after their creation
 * (None of them work for "dyninput" type fields at present)
 *
 * Morebits.quickForm.getElements(form, fieldName)
 *    Returns all form elements with a given field name or ID
 *
 * Morebits.quickForm.getCheckboxOrRadio(elementArray, value)
 *    Searches the array of elements for a checkbox or radio button with a certain |value| attribute
 *
 * Morebits.quickForm.getElementContainer(element)
 *    Returns the <div> containing the form element, or the form element itself
 *    May not work as expected on checkboxes or radios
 *
 * Morebits.quickForm.getElementLabelObject(element)
 *    Gets the HTML element that contains the label of the given form element (mainly for internal use)
 *
 * Morebits.quickForm.getElementLabel(element)
 *    Gets the label text of the element
 *
 * Morebits.quickForm.setElementLabel(element, labelText)
 *    Sets the label of the element to the given text
 *
 * Morebits.quickForm.overrideElementLabel(element, temporaryLabelText)
 *    Stores the element's current label, and temporarily sets the label to the given text
 *
 * Morebits.quickForm.resetElementLabel(element)
 *    Restores the label stored by overrideElementLabel
 *
 * Morebits.quickForm.setElementVisibility(element, visibility)
 *    Shows or hides a form element plus its label and tooltip
 *
 * Morebits.quickForm.setElementTooltipVisibility(element, visibility)
 *    Shows or hides the "question mark" icon next to a form element
 */

Morebits.quickForm.getElements = function QuickFormGetElements(form, fieldName) {
	var $form = $(form);
	var $elements = $form.find('[name="' + fieldName + '"]');
	if ($elements.length > 0) {
		return $elements.toArray();
	}
	$elements = $form.find('#' + fieldName);
	if ($elements.length > 0) {
		return $elements.toArray();
	}
	return null;
};

Morebits.quickForm.getCheckboxOrRadio = function QuickFormGetCheckboxOrRadio(elementArray, value) {
	var found = $.grep(elementArray, function(el) {
		return el.value === value;
	});
	if (found.length > 0) {
		return found[0];
	}
	return null;
};

Morebits.quickForm.getElementContainer = function QuickFormGetElementContainer(element) {
	// for divs, headings and fieldsets, the container is the element itself
	if (element instanceof HTMLFieldSetElement || element instanceof HTMLDivElement ||
			element instanceof HTMLHeadingElement) {
		return element;
	}

	// for others, just return the parent node
	return element.parentNode;
};

Morebits.quickForm.getElementLabelObject = function QuickFormGetElementLabelObject(element) {
	// for buttons, divs and headers, the label is on the element itself
	if (element.type === "button" || element.type === "submit" ||
			element instanceof HTMLDivElement || element instanceof HTMLHeadingElement) {
		return element;

	// for fieldsets, the label is the child <legend> element
	} else if (element instanceof HTMLFieldSetElement) {
		return element.getElementsByTagName("legend")[0];

	// for textareas, the label is the sibling <h5> element
	} else if (element instanceof HTMLTextAreaElement) {
		return element.parentNode.getElementsByTagName("h5")[0];

	// for others, the label is the sibling <label> element
	} else {
		return element.parentNode.getElementsByTagName("label")[0];
	}

	return null;
};

Morebits.quickForm.getElementLabel = function QuickFormGetElementLabel(element) {
	var labelElement = Morebits.quickForm.getElementLabelObject(element);

	if (!labelElement) {
		return null;
	}
	return labelElement.firstChild.textContent;
};

Morebits.quickForm.setElementLabel = function QuickFormSetElementLabel(element, labelText) {
	var labelElement = Morebits.quickForm.getElementLabelObject(element);

	if (!labelElement) {
		return false;
	}
	labelElement.firstChild.textContent = labelText;
	return true;
};

Morebits.quickForm.overrideElementLabel = function QuickFormOverrideElementLabel(element, temporaryLabelText) {
	if (!element.hasAttribute("data-oldlabel")) {
		element.setAttribute("data-oldlabel", Morebits.quickForm.getElementLabel(element));
	}
	return Morebits.quickForm.setElementLabel(element, temporaryLabelText);
};

Morebits.quickForm.resetElementLabel = function QuickFormResetElementLabel(element) {
	if (element.hasAttribute("data-oldlabel")) {
		return Morebits.quickForm.setElementLabel(element, element.getAttribute("data-oldlabel"));
	}
	return null;
};

Morebits.quickForm.setElementVisibility = function QuickFormSetElementVisibility(element, visibility) {
	$(element).toggle(visibility);
};

Morebits.quickForm.setElementTooltipVisibility = function QuickFormSetElementTooltipVisibility(element, visibility) {
	$(Morebits.quickForm.getElementContainer(element)).find(".morebits-tooltip").toggle(visibility);
};



/**
 * **************** HTMLFormElement ****************
 *
 * getChecked: 
 *   XXX Doesn't seem to work reliably across all browsers at the moment. -- see getChecked2 in twinkleunlink.js, which is better
 *
 *   Returns an array containing the values of elements with the given name, that has it's
 *   checked property set to true. (i.e. a checkbox or a radiobutton is checked), or select options
 *   that have selected set to true. (don't try to mix selects with radio/checkboxes, please)
 *   Type is optional and can specify if either radio or checkbox (for the event
 *   that both checkboxes and radiobuttons have the same name.
 */

HTMLFormElement.prototype.getChecked = function( name, type ) {
	var elements = this.elements[name];
	if( !elements ) { 
		// if the element doesn't exists, return null.
		return null;
	}
	var return_array = [];
	var i;
	if( elements instanceof HTMLSelectElement ) {
		var options = elements.options;
		for( i = 0; i < options.length; ++i ) {
			if( options[i].selected ) {
				if( options[i].values ) {
					return_array.push( options[i].values );
				} else {
					return_array.push( options[i].value );
				}

			}
		}
	} else if( elements instanceof HTMLInputElement ) {
		if( type && elements.type !== type ) {
			return [];
		} else if( elements.checked ) {
			return [ elements.value ];
		}
	} else {
		for( i = 0; i < elements.length; ++i ) {
			if( elements[i].checked ) {
				if( type && elements[i].type !== type ) {
					continue;
				}
				if( elements[i].values ) {
					return_array.push( elements[i].values );
				} else {
					return_array.push( elements[i].value );
				}
			}
		}
	}
	return return_array;
};



/**
 * **************** RegExp ****************
 *
 * RegExp.escape: Will escape a string to be used in a RegExp
 */

RegExp.escape = function( text, space_fix ) {

	text = mw.RegExp.escape(text);

	// Special MediaWiki escape - underscore/space are often equivalent
	if( space_fix ) {
		text = text.replace( / |_/g, '[_ ]' );
	}

	return text;
};



/**
 * **************** Morebits.bytes ****************
 * Utility object for formatting byte values
 */

Morebits.bytes = function( value ) {
	if( typeof value === 'string' ) {
		var res = /(\d+) ?(\w?)(i?)B?/.exec( value );
		var number = res[1];
		var mag = res[2];
		var si = res[3];

		if( !number ) {
			this.number = 0;
			return;
		}

		if( !si ) {
			this.value = number * Math.pow( 10, Morebits.bytes.magnitudes[mag] * 3 );
		} else {
			this.value = number * Math.pow( 2, Morebits.bytes.magnitudes[mag] * 10 );
		}
	} else {
		this.value = value;
	}
};

Morebits.bytes.magnitudes = {
	'': 0,
	'K': 1,
	'M': 2,
	'G': 3,
	'T': 4,
	'P': 5,
	'E': 6,
	'Z': 7,
	'Y': 8
};

Morebits.bytes.rmagnitudes = {
	0: '',
	1: 'K',
	2: 'M',
	3: 'G',
	4: 'T',
	5: 'P',
	6: 'E',
	7: 'Z',
	8: 'Y'
};

Morebits.bytes.prototype.valueOf = function() {
	return this.value;
};

Morebits.bytes.prototype.toString = function( magnitude ) {
	var tmp = this.value;
	if( magnitude ) {
		var si = /i/.test(magnitude);
		var mag = magnitude.replace( /.*?(\w)i?B?.*/g, '$1' );
		if( si ) {
			tmp /= Math.pow( 2, Morebits.bytes.magnitudes[mag] * 10 );
		} else {
			tmp /= Math.pow( 10, Morebits.bytes.magnitudes[mag] * 3 );
		}
		if( parseInt( tmp, 10 ) !== tmp ) {
			tmp = Number( tmp ).toPrecision( 4 );
		}
		return tmp + ' ' + mag + (si?'i':'') + 'B';
	} else {
		// si per default
		var current = 0;
		while( tmp >= 1024 ) {
			tmp /= 1024;
			++current;
		}
		tmp = this.value / Math.pow( 2, current * 10 );
		if( parseInt( tmp, 10 ) !== tmp ) {
			tmp = Number( tmp ).toPrecision( 4 );
		}
		return tmp + ' ' + Morebits.bytes.rmagnitudes[current] + ( current > 0 ? 'iB' : 'B' );
	}
};



/**
 * **************** String; Morebits.string ****************
 */

if (!String.prototype.trimLeft) {
	String.prototype.trimLeft = function stringPrototypeLtrim( chars ) {
		chars = chars || "\\s";
		return this.replace( new RegExp("^[" + chars + "]+", "g"), "" );
	};
}

if (!String.prototype.trimRight) {
	String.prototype.trimRight = function stringPrototypeRtrim( chars ) {
		chars = chars || "\\s";
		return this.replace( new RegExp("[" + chars + "]+$", "g"), "" );
	};
}

if (!String.prototype.trim) {
	String.prototype.trim = function stringPrototypeTrim( chars ) {
		return this.trimRight(chars).trimLeft(chars);
	};
}

// Helper functions to change case of a string
Morebits.string = {
	toUpperCaseFirstChar: function(str) {
		str = str.toString();
		return str.substr( 0, 1 ).toUpperCase() + str.substr( 1 );
	},
	toLowerCaseFirstChar: function(str) {
		str = str.toString();
		return str.substr( 0, 1 ).toLowerCase() + str.substr( 1 );
	},
	splitWeightedByKeys: function( str, start, end, skip ) {
		if( start.length !== end.length ) {
			throw new Error( 'start marker and end marker must be of the same length' );
		}
		var level = 0;
		var initial = null;
		var result = [];
		if( ! $.isArray( skip ) ) {
			if( skip === undefined ) {
				skip = [];
			} else if( typeof skip === 'string' ) {
				skip = [ skip ];
			} else {
				throw new Error( "non-applicable skip parameter" );
			}
		}
		for( var i  = 0; i < str.length; ++i ) {
			for( var j = 0; j < skip.length; ++j ) {
				if( str.substr( i, skip[j].length ) === skip[j] ) {
					i += skip[j].length - 1;
					continue;
				}
			}
			if( str.substr( i, start.length ) === start ) {
				if( initial === null ) {
					initial = i;
				}
				++level;
				i += start.length - 1;
			} else if( str.substr( i, end.length ) === end ) {
				--level;
				i += end.length - 1;
			}
			if( !level && initial !== null ) {
				result.push( str.substring( initial, i + 1 ) );
				initial = null;
			}
		}

		return result;
	}
};



/**
 * **************** Morebits.array ****************
 *
 * uniq(arr): returns a copy of the array with duplicates removed
 *
 * dups(arr): returns a copy of the array with the first instance of each value
 *            removed; subsequent instances of those values (duplicates) remain
 *
 * chunk(arr, size): breaks up |arr| into smaller arrays of length |size|, and
 *                   returns an array of these "chunked" arrays
 */

Morebits.array = {
	uniq: function(arr) {
		if ( ! $.isArray( arr ) ) {
			throw "A non-array object passed to Morebits.array.uniq";
		}
		var result = [];
		for( var i = 0; i < arr.length; ++i ) {
			var current = arr[i];
			if( result.indexOf( current ) === -1 ) {
				result.push( current );
			}
		}
		return result;
	},
	dups: function(arr) {
		if ( ! $.isArray( arr ) ) {
			throw "A non-array object passed to Morebits.array.dups";
		}
		var uniques = [];
		var result = [];
		for( var i = 0; i < arr.length; ++i ) {
			var current = arr[i];
			if( uniques.indexOf( current ) === -1 ) {
				uniques.push( current );
			} else {
				result.push( current );
			}
		}
		return result;
	},
	chunk: function( arr, size ) {
		if ( ! $.isArray( arr ) ) {
			throw "A non-array object passed to Morebits.array.chunk";
		}
		if( typeof size !== 'number' || size <= 0 ) { // pretty impossible to do anything :)
			return [ arr ]; // we return an array consisting of this array.
		}
		var result = [];
		var current;
		for( var i = 0; i < arr.length; ++i ) {
			if( i % size === 0 ) { // when 'i' is 0, this is always true, so we start by creating one.
				current = [];
				result.push( current );
			}
			current.push( arr[i] );
		}
		return result;
	}
};



/**
 * **************** Morebits.getPageAssociatedUser ****************
 * Get the user associated with the currently-viewed page.
 * Currently works on User:, User talk:, Special:Contributions.
 */

Morebits.getPageAssociatedUser = function(){
	var thisNamespaceId = mw.config.get('wgNamespaceNumber');

	if ( thisNamespaceId === 2 /* User: */ || thisNamespaceId === 3 /* User talk: */ ) {
		return mw.config.get('wgTitle').split( '/' )[0];  // only first part before any slashes, to work on subpages
	}

	if ( thisNamespaceId === -1 /* Special: */ && mw.config.get('wgCanonicalSpecialPageName') === "Contributions" ) {
		return mw.config.get("wgRelevantUserName");
	}

	return false;
};



/**
 * **************** Morebits.unbinder ****************
 * Used by Morebits.wikitext.page.commentOutImage
 */

Morebits.unbinder = function Unbinder( string ) {
	if( typeof string !== 'string' ) {
		throw new Error( "not a string" );
	}
	this.content = string;
	this.counter = 0;
	this.history = {};
	this.prefix = '%UNIQ::' + Math.random() + '::';
	this.postfix = '::UNIQ%';
}

Morebits.unbinder.prototype = {
	unbind: function UnbinderUnbind( prefix, postfix ) {
		var re = new RegExp( prefix + '(.*?)' + postfix, 'g' );
		this.content = this.content.replace( re, Morebits.unbinder.getCallback( this ) );
	},
	rebind: function UnbinderRebind() {
		var content = this.content;
		content.self = this;
		for( var current in this.history ) {
			if( this.history.hasOwnProperty( current ) ) {
				content = content.replace( current, this.history[current] );
			}
		}
		return content;
	},
	prefix: null, // %UNIQ::0.5955981644938324::
	postfix: null, // ::UNIQ%
	content: null, // string
	counter: null, // 0++
	history: null // {}
};

Morebits.unbinder.getCallback = function UnbinderGetCallback(self) {
	return function UnbinderCallback( match , a , b ) {
		var current = self.prefix + self.counter + self.postfix;
		self.history[current] = match;
		++self.counter;
		return current;
	};
};



/**
 * **************** Date ****************
 * Helper functions to get the month as a string instead of a number
 *
 * Normally it is poor form to play with prototypes of primitive types, but it
 * is fairly unlikely that anyone will iterate over a Date object.
 */

Date.monthNames = [
	'January',
	'February',
	'March',
	'April',
	'May',
	'June',
	'July',
	'August',
	'September',
	'October',
	'November',
	'December'
];

Date.monthNamesAbbrev = [
	'Jan',
	'Feb',
	'Mar',
	'Apr',
	'May',
	'Jun',
	'Jul',
	'Aug',
	'Sep',
	'Oct',
	'Nov',
	'Dec'
];

Date.prototype.getMonthName = function() {
	return Date.monthNames[ this.getMonth() ];
};

Date.prototype.getMonthNameAbbrev = function() {
	return Date.monthNamesAbbrev[ this.getMonth() ];
};

Date.prototype.getUTCMonthName = function() {
	return Date.monthNames[ this.getUTCMonth() ];
};

Date.prototype.getUTCMonthNameAbbrev = function() {
	return Date.monthNamesAbbrev[ this.getUTCMonth() ];
};



/**
 * **************** Morebits.wikipedia ****************
 * English Wikipedia-specific objects
 */

Morebits.wikipedia = {};

Morebits.wikipedia.namespaces = {
	'-2':  'Media',
	'-1':  'Special',
	'0':   '',
	'1':   'Talk',
	'2':   'User',
	'3':   'User talk',
	'4':   'Project',
	'5':   'Project talk',
	'6':   'File',
	'7':   'File talk',
	'8':   'MediaWiki',
	'9':   'MediaWiki talk',
	'10':  'Template',
	'11':  'Template talk',
	'12':  'Help',
	'13':  'Help talk',
	'14':  'Category',
	'15':  'Category talk',
	'100': 'Portal',
	'101': 'Portal talk',
	'108': 'Book',
	'109': 'Book talk'
};

Morebits.wikipedia.namespacesFriendly = {
	'0':   '(Article)',
	'1':   'Talk',
	'2':   'User',
	'3':   'User talk',
	'4':   'Wikipedia',
	'5':   'Wikipedia talk',
	'6':   'File',
	'7':   'File talk',
	'8':   'MediaWiki',
	'9':   'MediaWiki talk',
	'10':  'Template',
	'11':  'Template talk',
	'12':  'Help',
	'13':  'Help talk',
	'14':  'Category',
	'15':  'Category talk',
	'100': 'Portal',
	'101': 'Portal talk',
	'108': 'Book',
	'109': 'Book talk'
};



/**
 * **************** Morebits.wiki ****************
 * Various objects for wiki editing and API access
 */

Morebits.wiki = {};

// Analyzes the HTML of the current page (i.e. no AJAX requests) to determine if it
// is a redirect or soft redirect
Morebits.wiki.isPageRedirect = function wikipediaIsPageRedirect() {
	return !!($("span.redirectText").length > 0 || document.getElementById("softredirect"));
};



/**
 * **************** Morebits.wiki.actionCompleted ****************
 *
 * Use of Morebits.wiki.actionCompleted():
 *    Every call to Morebits.wiki.api.post() results in the dispatch of
 *    an asynchronous callback. Each callback can in turn
 *    make an additional call to Morebits.wiki.api.post() to continue a 
 *    processing sequence. At the conclusion of the final callback
 *    of a processing sequence, it is not possible to simply return to the
 *    original caller because there is no call stack leading back to
 *    the original context. Instead, Morebits.wiki.actionCompleted.event() is
 *    called to display the result to the user and to perform an optional
 *    page redirect.
 *
 *    The determination of when to call Morebits.wiki.actionCompleted.event()
 *    is managed through the globals Morebits.wiki.numberOfActionsLeft and
 *    Morebits.wiki.nbrOfCheckpointsLeft. Morebits.wiki.numberOfActionsLeft is
 *    incremented at the start of every Morebits.wiki.api call and decremented 
 *    after the completion of a callback function. If a callback function
 *    does not create a new Morebits.wiki.api object before exiting, it is the
 *    final step in the processing chain and Morebits.wiki.actionCompleted.event()
 *    will then be called.
 *
 *    Optionally, callers may use Morebits.wiki.addCheckpoint() to indicate that
 *    processing is not complete upon the conclusion of the final callback function.
 *    This is used for batch operations. The end of a batch is signaled by calling
 *    Morebits.wiki.removeCheckpoint(). 
 */

Morebits.wiki.numberOfActionsLeft = 0;
Morebits.wiki.nbrOfCheckpointsLeft = 0;

Morebits.wiki.actionCompleted = function( self ) {
	if( --Morebits.wiki.numberOfActionsLeft <= 0 && Morebits.wiki.nbrOfCheckpointsLeft <= 0 ) {
		Morebits.wiki.actionCompleted.event( self );
	}
};

// Change per action wanted
Morebits.wiki.actionCompleted.event = function() {
	new Morebits.status( Morebits.wiki.actionCompleted.notice, Morebits.wiki.actionCompleted.postfix, 'info' );
	if( Morebits.wiki.actionCompleted.redirect ) {
		// if it isn't a URL, make it one. TODO: This breaks on the articles 'http://', 'ftp://', and similar ones.
		if( !( (/^\w+\:\/\//).test( Morebits.wiki.actionCompleted.redirect ) ) ) {
			Morebits.wiki.actionCompleted.redirect = mw.util.getUrl( Morebits.wiki.actionCompleted.redirect );
			if( Morebits.wiki.actionCompleted.followRedirect === false ) {
				Morebits.wiki.actionCompleted.redirect += "?redirect=no";
			}
		}
		window.setTimeout( function() { window.location = Morebits.wiki.actionCompleted.redirect; }, Morebits.wiki.actionCompleted.timeOut );
	}
};

Morebits.wiki.actionCompleted.timeOut = ( typeof window.wpActionCompletedTimeOut === 'undefined' ? 5000 : window.wpActionCompletedTimeOut );
Morebits.wiki.actionCompleted.redirect = null;
Morebits.wiki.actionCompleted.notice = 'Action';
Morebits.wiki.actionCompleted.postfix = 'completed';

Morebits.wiki.addCheckpoint = function() {
	++Morebits.wiki.nbrOfCheckpointsLeft;
};

Morebits.wiki.removeCheckpoint = function() {
	if( --Morebits.wiki.nbrOfCheckpointsLeft <= 0 && Morebits.wiki.numberOfActionsLeft <= 0 ) {
		Morebits.wiki.actionCompleted.event();
	}
};

/**
 * **************** Morebits.wiki.api ****************
 * An easy way to talk to the MediaWiki API.
 *
 * Constructor parameters:
 *    currentAction: the current action (required)
 *    query: the query (required)
 *    onSuccess: the function to call when request gotten
 *    statusElement: a Morebits.status object to use for status messages (optional)
 *    onError: the function to call if an error occurs (optional)
 */
Morebits.wiki.api = function( currentAction, query, onSuccess, statusElement, onError ) {
	this.currentAction = currentAction;
	this.query = query;
	this.query.format = 'xml';
	this.query.assert = 'user';
	this.onSuccess = onSuccess;
	this.onError = onError;
	if( statusElement ) {
		this.statelem = statusElement;
		this.statelem.status( currentAction );
	} else {
		this.statelem = new Morebits.status( currentAction );
	}
};

Morebits.wiki.api.prototype = {
	currentAction: '',
	onSuccess: null,
	onError: null,
	parent: window,  // use global context if there is no parent object
	query: null,
	responseXML: null,
	setParent: function(parent) { this.parent = parent; },  // keep track of parent object for callbacks
	statelem: null,  // this non-standard name kept for backwards compatibility
	statusText: null, // result received from the API, normally "success" or "error"
	errorCode: null, // short text error code, if any, as documented in the MediaWiki API
	errorText: null, // full error description, if any

	// post(): carries out the request
	// do not specify a parameter unless you really really want to give jQuery some extra parameters
	post: function( callerAjaxParameters ) {

		++Morebits.wiki.numberOfActionsLeft;

		var ajaxparams = $.extend( {}, {
			context: this,
			type: 'POST',
			url: mw.util.wikiScript('api'),
			data: Morebits.queryString.create(this.query),
			datatype: 'xml',
			headers: {
				'Api-User-Agent': morebitsWikiApiUserAgent
			},

			success: function(xml, statusText, jqXHR) {
				this.statusText = statusText;
				this.responseXML = xml;
				this.errorCode = $(xml).find('error').attr('code');
				this.errorText = $(xml).find('error').attr('info');

				if (typeof this.errorCode === "string") {

					// the API didn't like what we told it, e.g., bad edit token or an error creating a page
					this.returnError();
					return;
				}

				// invoke success callback if one was supplied
				if (this.onSuccess) {

					// set the callback context to this.parent for new code and supply the API object
					// as the first argument to the callback (for legacy code)
					this.onSuccess.call( this.parent, this );
				} else {
					this.statelem.info("done");
				}

				Morebits.wiki.actionCompleted();
			},

			// only network and server errors reach here – complaints from the API itself are caught in success()
			error: function(jqXHR, statusText, errorThrown) {
				this.statusText = statusText;
				this.errorThrown = errorThrown; // frequently undefined
				this.errorText = statusText + ' "' + jqXHR.statusText + '" occurred while contacting the API.';
				this.returnError();
			}

		}, callerAjaxParameters );

		return $.ajax( ajaxparams );  // the return value should be ignored, unless using callerAjaxParameters with |async: false|
	},

	returnError: function() {
		this.statelem.error( this.errorText );
		
		// invoke failure callback if one was supplied
		if (this.onError) {

			// set the callback context to this.parent for new code and supply the API object
			// as the first argument to the callback for legacy code
			this.onError.call( this.parent, this );
		}
		// don't complete the action so that the error remains displayed
	},

	getStatusElement: function() {
		return this.statelem;
	},

	getErrorCode: function() {
		return this.errorCode;
	},

	getErrorText: function() {
		return this.errorText;
	},

	getXML: function() {
		return this.responseXML;
	}
};

// Custom user agent header, used by WMF for server-side logging
// See https://lists.wikimedia.org/pipermail/mediawiki-api-announce/2014-November/000075.html
var morebitsWikiApiUserAgent = 'morebits.js/2.0 ([[w:WT:TW]])';

// Sets the custom user agent header
Morebits.wiki.api.setApiUserAgent = function( ua ) {
	morebitsWikiApiUserAgent = ( ua ? ua + ' ' : '' ) + 'morebits.js/2.0 ([[w:WT:TW]])';
};



/**
 * **************** Morebits.wiki.page ****************
 * Uses the MediaWiki API to load a page and optionally edit it, move it, etc.
 *
 * Callers are not permitted to directly access the properties of this class!
 * All property access is through the appropriate get___() or set___() method.
 *
 * Callers should set Morebits.wiki.actionCompleted.notice and Morebits.wiki.actionCompleted.redirect
 * before the first call to Morebits.wiki.page.load().
 *
 * Each of the callback functions takes one parameter, which is a
 * reference to the Morebits.wiki.page object that registered the callback.
 * Callback functions may invoke any Morebits.wiki.page prototype method using this reference.
 *
 *
 * NOTE: This list of member functions is incomplete.
 *
 * Constructor: Morebits.wiki.page(pageName, currentAction)
 *    pageName - the name of the page, prefixed by the namespace (if any)
 *               (for the current page, use mw.config.get('wgPageName'))
 *    currentAction - a string describing the action about to be undertaken (optional)
 *
 * load(onSuccess, onFailure): Loads the text for the page
 *    onSuccess - callback function which is called when the load has succeeded
 *    onFailure - callback function which is called when the load fails (optional)
 *                XXX onFailure for load() is not yet implemented – do we need it? -- UncleDouggie
 *                    probably not -- TTO
 *
 * save(onSuccess, onFailure): Saves the text for the page. Must be preceded by calling load().
 *    onSuccess - callback function which is called when the save has succeeded (optional)
 *    onFailure - callback function which is called when the save fails (optional)
 *    Warning: Calling save() can result in additional calls to the previous load() callbacks to
 *             recover from edit conflicts! 
 *             In this case, callers must make the same edit to the new pageText and reinvoke save(). 
 *             This behavior can be disabled with setMaxConflictRetries(0).
 *
 * append(onSuccess, onFailure): Adds the text provided via setAppendText() to the end of the page.
 *                               Does not require calling load() first.
 *    onSuccess - callback function which is called when the method has succeeded (optional)
 *    onFailure - callback function which is called when the method fails (optional)
 *
 * prepend(onSuccess, onFailure): Adds the text provided via setPrependText() to the start of the page.
 *                                Does not require calling load() first.
 *    onSuccess - callback function which is called when the method has succeeded (optional)
 *    onFailure - callback function which is called when the method fails (optional)
 *
 * getPageName(): returns a string containing the name of the loaded page, including the namespace
 *
 * getPageText(): returns a string containing the text of the page after a successful load()
 *
 * setPageText(pageText) 
 *    pageText - string containing the updated page text that will be saved when save() is called
 *
 * setAppendText(appendText) 
 *    appendText - string containing the text that will be appended to the page when append() is called
 *
 * setPrependText(prependText) 
 *    prependText - string containing the text that will be prepended to the page when prepend() is called
 *
 * setEditSummary(summary)
 *    summary - string containing the text of the edit summary that will be used when save() is called
 *
 * setMinorEdit(minorEdit) 
 *    minorEdit is a boolean value:
 *       true  - When save is called, the resulting edit will be marked as "minor".
 *       false - When save is called, the resulting edit will not be marked as "minor". (default)
 *
 * setPageSection(pageSection)
 *    pageSection - integer specifying the section number to load or save. The default is |null|, which means
 *                  that the entire page will be retrieved.
 *
 * setMaxConflictRetries(maxRetries)
 *    maxRetries - number of retries for save errors involving an edit conflict or loss of edit token
 *    default: 2
 *
 * setMaxRetries(maxRetries)
 *    maxRetries - number of retries for save errors not involving an edit conflict or loss of edit token
 *    default: 2
 *
 * setCallbackParameters(callbackParameters)
 *    callbackParameters - an object for use in a callback function
 *
 * getCallbackParameters(): returns the object previous set by setCallbackParameters()
 *
 *    Callback notes: callbackParameters is for use by the caller only. The parameters
 *                    allow a caller to pass the proper context into its callback function.
 *                    Callers must ensure that any changes to the callbackParameters object
 *                    within a load() callback still permit a proper re-entry into the
 *                    load() callback if an edit conflict is detected upon calling save().
 *
 * getStatusElement(): returns the Status element created by the constructor
 *
 * setFollowRedirect(followRedirect)
 *    followRedirect is a boolean value:
 *       true  - a maximum of one redirect will be followed.
 *               In the event of a redirect, a message is displayed to the user and 
 *               the redirect target can be retrieved with getPageName().
 *       false - the requested pageName will be used without regard to any redirect. (default)
 *
 * setWatchlist(watchlistOption)
 *    watchlistOption is a boolean value:
 *       true  - page will be added to the user's watchlist when save() is called
 *       false - watchlist status of the page will not be changed (default)
 *
 * setWatchlistFromPreferences(watchlistOption)
 *    watchlistOption is a boolean value:
 *       true  - page watchlist status will be set based on the user's 
 *               preference settings when save() is called
 *       false - watchlist status of the page will not be changed (default)
 *
 *    Watchlist notes:
 *       1. The MediaWiki API value of 'unwatch', which explicitly removes the page from the
 *          user's watchlist, is not used.
 *       2. If both setWatchlist() and setWatchlistFromPreferences() are called,
 *          the last call takes priority.
 *       3. Twinkle modules should use the appropriate preference to set the watchlist options.
 *       4. Most Twinkle modules use setWatchlist().
 *          setWatchlistFromPreferences() is only needed for the few Twinkle watchlist preferences
 *          that accept a string value of 'default'.
 *
 * setCreateOption(createOption)
 *    createOption is a string value:
 *       'recreate'   - create the page if it does not exist, or edit it if it exists
 *       'createonly' - create the page if it does not exist, but return an error if it
 *                      already exists
 *       'nocreate'   - don't create the page, only edit it if it already exists
 *       null         - create the page if it does not exist, unless it was deleted in the moment
 *                      between retrieving the edit token and saving the edit (default)
 *
 * exists(): returns true if the page existed on the wiki when it was last loaded
 *
 * lookupCreator(onSuccess): Retrieves the username of the user who created the page
 *    onSuccess - callback function which is called when the username is found
 *                within the callback, the username can be retrieved using the getCreator() function
 * 
 * getCreator(): returns the user who created the page following lookupCreator()
 *
 * patrol(): marks the page as patrolled (only when "rcid" is present in the query string)
 *
 * move(onSuccess, onFailure): Moves a page to another title
 *
 * deletePage(onSuccess, onFailure): Deletes a page (for admins only)
 *
 */

/**
 * Call sequence for common operations (optional final user callbacks not shown):
 *
 *    Edit current contents of a page (no edit conflict):
 *       .load(userTextEditCallback) -> ctx.loadApi.post() -> ctx.loadApi.post.success() -> 
 *             ctx.fnLoadSuccess() -> userTextEditCallback() -> .save() -> 
 *             ctx.saveApi.post() -> ctx.loadApi.post.success() -> ctx.fnSaveSuccess()
 *
 *    Edit current contents of a page (with edit conflict):
 *       .load(userTextEditCallback) -> ctx.loadApi.post() -> ctx.loadApi.post.success() -> 
 *             ctx.fnLoadSuccess() -> userTextEditCallback() -> .save() -> 
 *             ctx.saveApi.post() -> ctx.loadApi.post.success() -> ctx.fnSaveError() ->
 *             ctx.loadApi.post() -> ctx.loadApi.post.success() -> 
 *             ctx.fnLoadSuccess() -> userTextEditCallback() -> .save() -> 
 *             ctx.saveApi.post() -> ctx.loadApi.post.success() -> ctx.fnSaveSuccess()
 *
 *    Append to a page (similar for prepend):
 *       .append() -> ctx.loadApi.post() -> ctx.loadApi.post.success() -> 
 *             ctx.fnLoadSuccess() -> ctx.fnAutoSave() -> .save() -> 
 *             ctx.saveApi.post() -> ctx.loadApi.post.success() -> ctx.fnSaveSuccess()
 *
 *    Notes: 
 *       1. All functions following Morebits.wiki.api.post() are invoked asynchronously 
 *          from the jQuery AJAX library.
 *       2. The sequence for append/prepend could be slightly shortened, but it would require
 *          significant duplication of code for little benefit.
 */

Morebits.wiki.page = function(pageName, currentAction) {

	if (!currentAction) {
		currentAction = 'Opening page "' + pageName + '"';
	}

	/**
	 * Private context variables
	 *
	 * This context is not visible to the outside, thus all the data here
	 * must be accessed via getter and setter functions.
	 */
	var ctx = {
		 // backing fields for public properties
		pageName: pageName,
		pageExists: false,
		editSummary: null,
		callbackParameters: null,
		statusElement: new Morebits.status(currentAction),
		 // - edit
		pageText: null,
		editMode: 'all',  // save() replaces entire contents of the page by default
		appendText: null,   // can't reuse pageText for this because pageText is needed to follow a redirect
		prependText: null,  // can't reuse pageText for this because pageText is needed to follow a redirect
		createOption: null,
		minorEdit: false,
		pageSection: null,
		maxConflictRetries: 2,
		maxRetries: 2,
		followRedirect: false,
		watchlistOption: 'nochange',
		creator: null,
		 // - revert
		revertOldID: null,
		 // - move
		moveDestination: null,
		moveTalkPage: false,
		moveSubpages: false,
		moveSuppressRedirect: false,
		 // - protect
		protectEdit: null,
		protectMove: null,
		protectCreate: null,
		protectCascade: false,
		 // - stabilize (FlaggedRevs)
		flaggedRevs: null,
		 // internal status
		pageLoaded: false,
		editToken: null,
		loadTime: null,
		lastEditTime: null,
		revertCurID: null,
		revertUser: null,
		fullyProtected: false,
		conflictRetries: 0,
		retries: 0,
		 // callbacks
		onLoadSuccess: null,
		onLoadFailure: null,
		onSaveSuccess: null,
		onSaveFailure: null,
		onLookupCreatorSuccess: null,
		onMoveSuccess: null,
		onMoveFailure: null,
		onDeleteSuccess: null,
		onDeleteFailure: null,
		onProtectSuccess: null,
		onProtectFailure: null,
		onStabilizeSuccess: null,
		onStabilizeFailure: null,
		 // internal objects
		loadQuery: null,
		loadApi: null,
		saveApi: null,
		lookupCreatorApi: null,
		moveApi: null,
		moveProcessApi: null,
		deleteApi: null,
		deleteProcessApi: null,
		protectApi: null,
		protectProcessApi: null,
		stabilizeApi: null,
		stabilizeProcessApi: null
	};

	var emptyFunction = function() { };

	/**
	 * Public interface accessors
	 */
	this.getPageName = function() {
		return ctx.pageName;
	};

	this.getPageText = function() {
		return ctx.pageText;
	};

	this.setPageText = function(pageText) {
		ctx.editMode = 'all';
		ctx.pageText = pageText;
	};

	this.setAppendText = function(appendText) {
		ctx.editMode = 'append';
		ctx.appendText = appendText;
	};

	this.setPrependText = function(prependText) {
		ctx.editMode = 'prepend';
		ctx.prependText = prependText;
	};

	this.setEditSummary = function(summary) {
		ctx.editSummary = summary;
	};

	this.setCreateOption = function(createOption) {
		ctx.createOption = createOption;
	};

	this.setMinorEdit = function(minorEdit) {
		ctx.minorEdit = minorEdit;
	};

	this.setPageSection = function(pageSection) {
		ctx.pageSection = pageSection;
	};

	this.setMaxConflictRetries = function(maxRetries) {
		ctx.maxConflictRetries = maxRetries;
	};

	this.setMaxRetries = function(maxRetries) {
		ctx.maxRetries = maxRetries;
	};

	this.setCallbackParameters = function(callbackParameters) {
		ctx.callbackParameters = callbackParameters;
	};

	this.getCallbackParameters = function() {
		return ctx.callbackParameters;
	};

	this.getCreator = function() {
		return ctx.creator;
	};

	this.setOldID = function(oldID) {
		ctx.revertOldID = oldID;
	};

	this.getRevisionUser = function() {
		return ctx.revertUser;
	};

	this.setMoveDestination = function(destination) {
		ctx.moveDestination = destination;
	};

	this.setMoveTalkPage = function(flag) {
		ctx.moveTalkPage = !!flag;
	};

	this.setMoveSubpages = function(flag) {
		ctx.moveSubpages = !!flag;
	};

	this.setMoveSuppressRedirect = function(flag) {
		ctx.moveSuppressRedirect = !!flag;
	};

	this.setEditProtection = function(level, expiry) {
		ctx.protectEdit = { level: level, expiry: expiry };
	};

	this.setMoveProtection = function(level, expiry) {
		ctx.protectMove = { level: level, expiry: expiry };
	};

	this.setCreateProtection = function(level, expiry) {
		ctx.protectCreate = { level: level, expiry: expiry };
	};

	this.setCascadingProtection = function(flag) {
		ctx.protectCascade = !!flag;
	};
	
	this.setFlaggedRevs = function(level, expiry) {
		ctx.flaggedRevs = { level: level, expiry: expiry };
	};

	this.getStatusElement = function() {
		return ctx.statusElement;
	};

	this.setFollowRedirect = function(followRedirect) {
		if (ctx.pageLoaded) {
			ctx.statusElement.error("Internal error: cannot change redirect setting after the page has been loaded!");
			return;
		}
		ctx.followRedirect = followRedirect;
	};

	this.setWatchlist = function(flag) {
		if (flag) {
			ctx.watchlistOption = 'watch';
		} else {
			ctx.watchlistOption = 'nochange';
		}
	};

	this.setWatchlistFromPreferences = function(flag) {
		if (flag) {
			ctx.watchlistOption = 'preferences';
		} else {
			ctx.watchlistOption = 'nochange';
		}
	};

	this.exists = function() {
		return ctx.pageExists;
	};

	this.load = function(onSuccess, onFailure) {
		ctx.onLoadSuccess = onSuccess;
		ctx.onLoadFailure = onFailure || emptyFunction;

		// Need to be able to do something after the page loads
		if (!onSuccess) {
			ctx.statusElement.error("Internal error: no onSuccess callback provided to load()!");
			ctx.onLoadFailure(this);
			return;
		}

		ctx.loadQuery = {
			action: 'query',
			prop: 'info|revisions',
			intoken: 'edit',  // fetch an edit token
			titles: ctx.pageName
			// don't need rvlimit=1 because we don't need rvstartid here and only one actual rev is returned by default
		};

		if (ctx.editMode === 'all') {
			ctx.loadQuery.rvprop = 'content';  // get the page content at the same time, if needed
		} else if (ctx.editMode === 'revert') {
			ctx.loadQuery.rvlimit = 1;
			ctx.loadQuery.rvstartid = ctx.revertOldID;
		}

		if (ctx.followRedirect) {
			ctx.loadQuery.redirects = '';  // follow all redirects
		}
		if (typeof ctx.pageSection === 'number') {
			ctx.loadQuery.rvsection = ctx.pageSection;
		}
		if (Morebits.userIsInGroup('sysop')) {
			ctx.loadQuery.inprop = 'protection';
		}

		ctx.loadApi = new Morebits.wiki.api("Retrieving page...", ctx.loadQuery, fnLoadSuccess, ctx.statusElement, ctx.onLoadFailure);
		ctx.loadApi.setParent(this);
		ctx.loadApi.post();
	};

	// Save updated .pageText to Wikipedia
	// Only valid after successful .load()
	this.save = function(onSuccess, onFailure) {
		ctx.onSaveSuccess = onSuccess;
		ctx.onSaveFailure = onFailure || emptyFunction;

		if (!ctx.pageLoaded) {
			ctx.statusElement.error("Internal error: attempt to save a page that has not been loaded!");
			ctx.onSaveFailure(this);
			return;
		}
		if (!ctx.editSummary) {
			ctx.statusElement.error("Internal error: edit summary not set before save!");
			ctx.onSaveFailure(this);
			return;
		}

		if (ctx.fullyProtected && !confirm('You are about to make an edit to the fully protected page "' + ctx.pageName +
			(ctx.fullyProtected === 'infinity' ? '" (protected indefinitely)' : ('" (protection expiring ' + ctx.fullyProtected + ')')) +
			'.  \n\nClick OK to proceed with the edit, or Cancel to skip this edit.')) {
			ctx.statusElement.error("Edit to fully protected page was aborted.");
			ctx.onSaveFailure(this);
			return;
		}

		ctx.retries = 0;

		var query = {
			action: 'edit',
			title: ctx.pageName,
			summary: ctx.editSummary,
			token: ctx.editToken,
			watchlist: ctx.watchlistOption
		};

		if (typeof ctx.pageSection === 'number') {
			query.section = ctx.pageSection;
		}

		// Set minor edit attribute. If these parameters are present with any value, it is interpreted as true
		if (ctx.minorEdit) {
			query.minor = true;
		} else {
			query.notminor = true;  // force Twinkle config to override user preference setting for "all edits are minor"
		}

		switch (ctx.editMode) {
		case 'append':
			query.appendtext = ctx.appendText;  // use mode to append to current page contents
			break;
		case 'prepend':
			query.prependtext = ctx.prependText;  // use mode to prepend to current page contents
			break;
		case 'revert':
			query.undo = ctx.revertCurID;
			query.undoafter = ctx.revertOldID;
			if (ctx.lastEditTime) {
				query.basetimestamp = ctx.lastEditTime; // check that page hasn't been edited since it was loaded
			}
			query.starttimestamp = ctx.loadTime; // check that page hasn't been deleted since it was loaded (don't recreate bad stuff)
			break;
		default:
			query.text = ctx.pageText; // replace entire contents of the page
			if (ctx.lastEditTime) {
				query.basetimestamp = ctx.lastEditTime; // check that page hasn't been edited since it was loaded
			}
			query.starttimestamp = ctx.loadTime; // check that page hasn't been deleted since it was loaded (don't recreate bad stuff)
			break;
		}

		if (['recreate', 'createonly', 'nocreate'].indexOf(ctx.createOption) !== -1) {
			query[ctx.createOption] = '';
		}

		ctx.saveApi = new Morebits.wiki.api( "Saving page...", query, fnSaveSuccess, ctx.statusElement, fnSaveError);
		ctx.saveApi.setParent(this);
		ctx.saveApi.post();
	};

	this.append = function(onSuccess, onFailure) {
		ctx.editMode = 'append';
		ctx.onSaveSuccess = onSuccess;
		ctx.onSaveFailure = onFailure || emptyFunction;
		this.load(fnAutoSave, ctx.onSaveFailure);
	};

	this.prepend = function(onSuccess, onFailure) {
		ctx.editMode = 'prepend';
		ctx.onSaveSuccess = onSuccess;
		ctx.onSaveFailure = onFailure || emptyFunction;
		this.load(fnAutoSave, ctx.onSaveFailure);
	};

	this.lookupCreator = function(onSuccess) {
		if (!onSuccess) {
			ctx.statusElement.error("Internal error: no onSuccess callback provided to lookupCreator()!");
			return;
		}
		ctx.onLookupCreatorSuccess = onSuccess;

		var query = {
			'action': 'query',
			'prop': 'revisions',
			'titles': ctx.pageName,
			'rvlimit': 1,
			'rvprop': 'user',
			'rvdir': 'newer'
		};
		
		if (ctx.followRedirect) {
			query.redirects = '';  // follow all redirects
		}
		
		ctx.lookupCreatorApi = new Morebits.wiki.api("Retrieving page creator information", query, fnLookupCreatorSuccess, ctx.statusElement);
		ctx.lookupCreatorApi.setParent(this);
		ctx.lookupCreatorApi.post();
	};

	this.patrol = function() {
		// look for rcid in querystring; if not, we won't have a patrol token, so no point trying
		if (!Morebits.queryString.exists("rcid")) {
			return;
		}
		var rcid = Morebits.queryString.get("rcid");

		// extract patrol token from "Mark page as patrolled" link on page
		var patrollinkmatch = /token=(.+)%2B%5C$/.exec($(".patrollink a").attr("href"));
		if (patrollinkmatch) {
			var patroltoken = patrollinkmatch[1] + "+\\";
			var patrolstat = new Morebits.status("Marking page as patrolled");

			var wikipedia_api = new Morebits.wiki.api("doing...", {
				title: ctx.pageName,
				action: 'markpatrolled',
				rcid: rcid,
				token: patroltoken
			}, null, patrolstat);
			wikipedia_api.post({
				type: 'GET',
				url: mw.util.wikiScript('index'),
				datatype: 'text'  // we don't really care about the response
			});
		}
	};

	this.revert = function(onSuccess, onFailure) {
		ctx.onSaveSuccess = onSuccess;
		ctx.onSaveFailure = onFailure || emptyFunction;

		if (!ctx.revertOldID) {
			ctx.statusElement.error("Internal error: revision ID to revert to was not set before revert!");
			ctx.onSaveFailure(this);
			return;
		}

		ctx.editMode = 'revert';
		this.load(fnAutoSave, ctx.onSaveFailure);
	};

	this.move = function(onSuccess, onFailure) {
		ctx.onMoveSuccess = onSuccess;
		ctx.onMoveFailure = onFailure || emptyFunction;

		if (!ctx.editSummary) {
			ctx.statusElement.error("Internal error: move reason not set before move (use setEditSummary function)!");
			ctx.onMoveFailure(this);
			return;
		}
		if (!ctx.moveDestination) {
			ctx.statusElement.error("Internal error: destination page name was not set before move!");
			ctx.onMoveFailure(this);
			return;
		}

		var query = {
			action: 'query',
			prop: 'info',
			intoken: 'move',
			titles: ctx.pageName
		};
		if (ctx.followRedirect) {
			query.redirects = '';  // follow all redirects
		}
		if (Morebits.userIsInGroup('sysop')) {
			query.inprop = 'protection';
		}

		ctx.moveApi = new Morebits.wiki.api("retrieving move token...", query, fnProcessMove, ctx.statusElement, ctx.onMoveFailure);
		ctx.moveApi.setParent(this);
		ctx.moveApi.post();
	};

	// |delete| is a reserved word in some flavours of JS
	this.deletePage = function(onSuccess, onFailure) {
		ctx.onDeleteSuccess = onSuccess;
		ctx.onDeleteFailure = onFailure || emptyFunction;

		// if a non-admin tries to do this, don't bother
		if (!Morebits.userIsInGroup('sysop')) {
			ctx.statusElement.error("Cannot delete page: only admins can do that");
			ctx.onDeleteFailure(this);
			return;
		}
		if (!ctx.editSummary) {
			ctx.statusElement.error("Internal error: delete reason not set before delete (use setEditSummary function)!");
			ctx.onDeleteFailure(this);
			return;
		}

		var query = {
			action: 'query',
			prop: 'info',
			inprop: 'protection',
			intoken: 'delete',
			titles: ctx.pageName
		};
		if (ctx.followRedirect) {
			query.redirects = '';  // follow all redirects
		}

		ctx.deleteApi = new Morebits.wiki.api("retrieving delete token...", query, fnProcessDelete, ctx.statusElement, ctx.onDeleteFailure);
		ctx.deleteApi.setParent(this);
		ctx.deleteApi.post();
	};

	this.protect = function(onSuccess, onFailure) {
		ctx.onProtectSuccess = onSuccess;
		ctx.onProtectFailure = onFailure || emptyFunction;

		// if a non-admin tries to do this, don't bother
		if (!Morebits.userIsInGroup('sysop')) {
			ctx.statusElement.error("Cannot protect page: only admins can do that");
			ctx.onProtectFailure(this);
			return;
		}
		if (!ctx.protectEdit && !ctx.protectMove && !ctx.protectCreate) {
			ctx.statusElement.error("Internal error: you must set edit and/or move and/or create protection before calling protect()!");
			ctx.onProtectFailure(this);
			return;
		}
		if (!ctx.editSummary) {
			ctx.statusElement.error("Internal error: protection reason not set before protect (use setEditSummary function)!");
			ctx.onProtectFailure(this);
			return;
		}

		var query = {
			action: 'query',
			prop: 'info',
			inprop: 'protection',
			intoken: 'protect',
			titles: ctx.pageName
		};
		if (ctx.followRedirect) {
			query.redirects = '';  // follow all redirects
		}

		ctx.protectApi = new Morebits.wiki.api("retrieving protect token...", query, fnProcessProtect, ctx.statusElement, ctx.onProtectFailure);
		ctx.protectApi.setParent(this);
		ctx.protectApi.post();
	};
	
	// apply FlaggedRevs protection-style settings
	// only works where $wgFlaggedRevsProtection = true (i.e. where FlaggedRevs
	// settings appear on the wiki's "protect" tab)
	this.stabilize = function(onSuccess, onFailure) {
		ctx.onStabilizeSuccess = onSuccess;
		ctx.onStabilizeFailure = onFailure || emptyFunction;

		// if a non-admin tries to do this, don't bother
		if (!Morebits.userIsInGroup('sysop')) {
			ctx.statusElement.error("Cannot apply FlaggedRevs settings: only admins can do that");
			ctx.onStabilizeFailure(this);
			return;
		}
		if (!ctx.flaggedRevs) {
			ctx.statusElement.error("Internal error: you must set flaggedRevs before calling stabilize()!");
			ctx.onStabilizeFailure(this);
			return;
		}
		if (!ctx.editSummary) {
			ctx.statusElement.error("Internal error: reason not set before calling stabilize() (use setEditSummary function)!");
			ctx.onStabilizeFailure(this);
			return;
		}

		var query = {
			action: 'query',
			prop: 'info|flagged',
			intoken: 'edit',
			titles: ctx.pageName
		};
		if (ctx.followRedirect) {
			query.redirects = '';  // follow all redirects
		}

		ctx.stabilizeApi = new Morebits.wiki.api("retrieving stabilize token...", query, fnProcessStabilize, ctx.statusElement, ctx.onStabilizeFailure);
		ctx.stabilizeApi.setParent(this);
		ctx.stabilizeApi.post();
	};

	/**
	 * Private member functions
	 *
	 * These are not exposed outside
	 */

	// callback from loadSuccess() for append() and prepend() threads
	var fnAutoSave = function(pageobj) {
		pageobj.save(ctx.onSaveSuccess, ctx.onSaveFailure);
	};

	// callback from loadApi.post()
	var fnLoadSuccess = function() {
		var xml = ctx.loadApi.getXML();

		if ( !fnCheckPageName(xml, ctx.onLoadFailure) ) {
			return; // abort
		}

		ctx.pageExists = ($(xml).find('page').attr('missing') !== "");
		if (ctx.pageExists) {
			ctx.pageText = $(xml).find('rev').text();
		} else {
			ctx.pageText = '';  // allow for concatenation, etc.
		}

		// extract protection info, to alert admins when they are about to edit a protected page
		if (Morebits.userIsInGroup('sysop')) {
			var editprot = $(xml).find('pr[type="edit"]');
			if (editprot.length > 0 && editprot.attr('level') === 'sysop') {
				ctx.fullyProtected = editprot.attr('expiry');
			} else {
				ctx.fullyProtected = false;
			}
		}

		ctx.editToken = $(xml).find('page').attr('edittoken');
		if (!ctx.editToken)
		{
			ctx.statusElement.error("Failed to retrieve edit token.");
			ctx.onLoadFailure(this);
			return;
		}
		ctx.loadTime = $(xml).find('page').attr('starttimestamp');
		if (!ctx.loadTime)
		{
			ctx.statusElement.error("Failed to retrieve start timestamp.");
			ctx.onLoadFailure(this);
			return;
		}
		ctx.lastEditTime = $(xml).find('page').attr('touched');

		if (ctx.editMode === 'revert') {
			ctx.revertCurID = $(xml).find('rev').attr('revid');
			if (!ctx.revertCurID) {
				ctx.statusElement.error("Failed to retrieve current revision ID.");
				ctx.onLoadFailure(this);
				return;
			}
			ctx.revertUser = $(xml).find('rev').attr('user');
			if (!ctx.revertUser) {
				if ($(xml).find('rev').attr('userhidden') === "") {  // username was RevDel'd or oversighted
					ctx.revertUser = "<username hidden>";
				} else {
					ctx.statusElement.error("Failed to retrieve user who made the revision.");
					ctx.onLoadFailure(this);
					return;
				}
			}
			// set revert edit summary
			ctx.editSummary = "[[Help:Revert|Reverted]] to revision " + ctx.revertOldID + " by " + ctx.revertUser + ": " + ctx.editSummary;
		}

		ctx.pageLoaded = true;

		// alert("Generate edit conflict now");  // for testing edit conflict recovery logic
		ctx.onLoadSuccess(this);  // invoke callback
	};

	// helper function to parse the page name returned from the API
	var fnCheckPageName = function(xml, onFailure) {
		if (!onFailure) {
			onFailure = emptyFunction;
		}

		// check for invalid titles
		if ( $(xml).find('page').attr('invalid') === "" ) {
			ctx.statusElement.error("The page title is invalid: " + ctx.pageName);
			onFailure(this);
			return false; // abort
		}

		// retrieve actual title of the page after normalization and redirects
		if ( $(xml).find('page').attr('title') ) {
			var resolvedName = $(xml).find('page').attr('title');
			
			// only notify user for redirects, not normalization
			if ( $(xml).find('redirects').length > 0 ) {
				Morebits.status.info("Info", "Redirected from " + ctx.pageName + " to " + resolvedName );
			}
			ctx.pageName = resolvedName;  // always update in case of normalization
		}
		else {
			// could be a circular redirect or other problem
			ctx.statusElement.error("Could not resolve redirects for: " + ctx.pageName);
			onFailure(this);

			// force error to stay on the screen
			++Morebits.wiki.numberOfActionsLeft;
			return false; // abort
		}
		return true; // all OK
	};

	// callback from saveApi.post()
	var fnSaveSuccess = function() {
		ctx.editMode = 'all';  // cancel append/prepend/revert modes
		var xml = ctx.saveApi.getXML();

		// see if the API thinks we were successful
		if ($(xml).find('edit').attr('result') === "Success") {
		
			// real success
			// default on success action - display link for edited page
			var link = document.createElement('a');
			link.setAttribute('href', mw.util.getUrl(ctx.pageName) );
			link.appendChild(document.createTextNode(ctx.pageName));
			ctx.statusElement.info(['completed (', link, ')']);
			if (ctx.onSaveSuccess) {
				ctx.onSaveSuccess(this);  // invoke callback
			}
			return;
		}
		
		// errors here are only generated by extensions which hook APIEditBeforeSave within MediaWiki
		// Wikimedia wikis should only return spam blacklist errors and captchas
		var blacklist = $(xml).find('edit').attr('spamblacklist');

		if (blacklist) {
			var code = document.createElement('code');
			code.style.fontFamily = "monospace";
			code.appendChild(document.createTextNode(blacklist));
			ctx.statusElement.error(['Could not save the page because the URL ', code, ' is on the spam blacklist.']);
		}
		else if ( $(xml).find('captcha').length > 0 ) {
			ctx.statusElement.error("Could not save the page because the wiki server wanted you to fill out a CAPTCHA.");
		}
		else {
			ctx.statusElement.error("Unknown error received from API while saving page");
		}
		
		// force error to stay on the screen
		++Morebits.wiki.numberOfActionsLeft;

		ctx.onSaveFailure(this);
	};

	// callback from saveApi.post()
	var fnSaveError = function() {

		var errorCode = ctx.saveApi.getErrorCode();

		// check for edit conflict
		if ( errorCode === "editconflict" && ctx.conflictRetries++ < ctx.maxConflictRetries ) {
			 
			// edit conflicts can occur when the page needs to be purged from the server cache
			var purgeQuery = {
				action: 'purge',
				titles: ctx.pageName  // redirects are already resolved
			};

			var purgeApi = new Morebits.wiki.api("Edit conflict detected, purging server cache", purgeQuery, null, ctx.statusElement);
			var result = purgeApi.post( { async: false } );  // just wait for it, result is for debugging

			--Morebits.wiki.numberOfActionsLeft;  // allow for normal completion if retry succeeds
			
			ctx.statusElement.info("Edit conflict detected, reapplying edit");
			ctx.loadApi.post(); // reload the page and reapply the edit

		// check for loss of edit token
		// it's impractical to request a new token here, so invoke edit conflict logic when this happens
		} else if ( errorCode === "notoken" && ctx.conflictRetries++ < ctx.maxConflictRetries ) {
			 
			ctx.statusElement.info("Edit token is invalid, retrying");
			--Morebits.wiki.numberOfActionsLeft;  // allow for normal completion if retry succeeds
			ctx.loadApi.post(); // reload

		// check for network or server error
		} else if ( errorCode === "undefined" && ctx.retries++ < ctx.maxRetries ) {

			// the error might be transient, so try again
			ctx.statusElement.info("Save failed, retrying");
			--Morebits.wiki.numberOfActionsLeft;  // allow for normal completion if retry succeeds
			ctx.saveApi.post(); // give it another go!

		// hard error, give up
		} else {

			// non-admin attempting to edit a protected page - this gives a friendlier message than the default
			if ( errorCode === "protectedpage" ) {
				ctx.statusElement.error( "Failed to save edit: Page is fully protected" );
			} else {
				ctx.statusElement.error( "Failed to save edit: " + ctx.saveApi.getErrorText() );
			}
			ctx.editMode = 'all';  // cancel append/prepend/revert modes
			if (ctx.onSaveFailure) {
				ctx.onSaveFailure(this);  // invoke callback
			}
		}
	};

	var fnLookupCreatorSuccess = function() {
		var xml = ctx.lookupCreatorApi.getXML();
		
		if ( !fnCheckPageName(xml) ) {
			return; // abort
		}

		ctx.creator = $(xml).find('rev').attr('user');
		if (!ctx.creator) {
			ctx.statusElement.error("Could not find name of page creator");
			return;
		}
		ctx.onLookupCreatorSuccess(this);
	};

	var fnProcessMove = function() {
		var xml = ctx.moveApi.getXML();

		if ($(xml).find('page').attr('missing') === "") {
			ctx.statusElement.error("Cannot move the page, because it no longer exists");
			ctx.onMoveFailure(this);
			return;
		}

		// extract protection info
		if (Morebits.userIsInGroup('sysop')) {
			var editprot = $(xml).find('pr[type="edit"]');
			if (editprot.length > 0 && editprot.attr('level') === 'sysop' && !confirm('You are about to move the fully protected page "' + ctx.pageName + 
				(editprot.attr('expiry') === 'infinity' ? '" (protected indefinitely)' : ('" (protection expiring ' + editprot.attr('expiry') + ')')) +
				'.  \n\nClick OK to proceed with the move, or Cancel to skip this move.')) {
				ctx.statusElement.error("Move of fully protected page was aborted.");
				ctx.onMoveFailure(this);
				return;
			}
		}

		var moveToken = $(xml).find('page').attr('movetoken');
		if (!moveToken) {
			ctx.statusElement.error("Failed to retrieve move token.");
			ctx.onMoveFailure(this);
			return;
		}

		var query = {
			'action': 'move',
			'from': $(xml).find('page').attr('title'),
			'to': ctx.moveDestination,
			'token': moveToken,
			'reason': ctx.editSummary
		};
		if (ctx.moveTalkPage) {
			query.movetalk = 'true';
		}
		if (ctx.moveSubpages) {
			query.movesubpages = 'true';  // XXX don't know whether this works for non-admins
		}
		if (ctx.moveSuppressRedirect) {
			query.noredirect = 'true';
		}
		if (ctx.watchlistOption === 'watch') {
			query.watch = 'true';
		}

		ctx.moveProcessApi = new Morebits.wiki.api("moving page...", query, ctx.onMoveSuccess, ctx.statusElement, ctx.onMoveFailure);
		ctx.moveProcessApi.setParent(this);
		ctx.moveProcessApi.post();
	};

	var fnProcessDelete = function() {
		var xml = ctx.deleteApi.getXML();

		if ($(xml).find('page').attr('missing') === "") {
			ctx.statusElement.error("Cannot delete the page, because it no longer exists");
			ctx.onDeleteFailure(this);
			return;
		}

		// extract protection info
		var editprot = $(xml).find('pr[type="edit"]');
		if (editprot.length > 0 && editprot.attr('level') === 'sysop' && !confirm('You are about to delete the fully protected page "' + ctx.pageName + 
			(editprot.attr('expiry') === 'infinity' ? '" (protected indefinitely)' : ('" (protection expiring ' + editprot.attr('expiry') + ')')) +
			'.  \n\nClick OK to proceed with the deletion, or Cancel to skip this deletion.')) {
			ctx.statusElement.error("Deletion of fully protected page was aborted.");
			ctx.onDeleteFailure(this);
			return;
		}

		var deleteToken = $(xml).find('page').attr('deletetoken');
		if (!deleteToken) {
			ctx.statusElement.error("Failed to retrieve delete token.");
			ctx.onDeleteFailure(this);
			return;
		}

		var query = {
			'action': 'delete',
			'title': $(xml).find('page').attr('title'),
			'token': deleteToken,
			'reason': ctx.editSummary
		};
		if (ctx.watchlistOption === 'watch') {
			query.watch = 'true';
		}

		ctx.deleteProcessApi = new Morebits.wiki.api("deleting page...", query, ctx.onDeleteSuccess, ctx.statusElement, ctx.onDeleteFailure);
		ctx.deleteProcessApi.setParent(this);
		ctx.deleteProcessApi.post();
	};

	var fnProcessProtect = function() {
		var xml = ctx.protectApi.getXML();

		var missing = ($(xml).find('page').attr('missing') === "");
		if (((ctx.protectEdit || ctx.protectMove) && missing)) {
			ctx.statusElement.error("Cannot protect the page, because it no longer exists");
			ctx.onProtectFailure(this);
			return;
		}
		if (ctx.protectCreate && !missing) {
			ctx.statusElement.error("Cannot create protect the page, because it already exists");
			ctx.onProtectFailure(this);
			return;
		}

		// TODO cascading protection not possible on edit<sysop

		var protectToken = $(xml).find('page').attr('protecttoken');
		if (!protectToken) {
			ctx.statusElement.error("Failed to retrieve protect token.");
			ctx.onProtectFailure(this);
			return;
		}

		// fetch existing protection levels
		var prs = $(xml).find('pr');
		var editprot = prs.filter('[type="edit"]');
		var moveprot = prs.filter('[type="move"]');
		var createprot = prs.filter('[type="create"]');

		var protections = [], expirys = [];

		// set edit protection level
		if (ctx.protectEdit) {
			protections.push('edit=' + ctx.protectEdit.level);
			expirys.push(ctx.protectEdit.expiry);
		} else if (editprot.length) {
			protections.push('edit=' + editprot.attr("level"));
			expirys.push(editprot.attr("expiry").replace("infinity", "indefinite"));
		}

		if (ctx.protectMove) { 
			protections.push('move=' + ctx.protectMove.level);
			expirys.push(ctx.protectMove.expiry);
		} else if (moveprot.length) {
			protections.push('move=' + moveprot.attr("level"));
			expirys.push(moveprot.attr("expiry").replace("infinity", "indefinite"));
		}

		if (ctx.protectCreate) {
			protections.push('create=' + ctx.protectCreate.level);
			expirys.push(ctx.protectCreate.expiry);
		} else if (createprot.length) {
			protections.push('create=' + createprot.attr("level"));
			expirys.push(createprot.attr("expiry").replace("infinity", "indefinite"));
		}

		var query = {
			action: 'protect',
			title: $(xml).find('page').attr('title'),
			token: protectToken,
			protections: protections.join('|'),
			expiry: expirys.join('|'),
			reason: ctx.editSummary
		};
		if (ctx.protectCascade) {
			query.cascade = 'true';
		}
		if (ctx.watchlistOption === 'watch') {
			query.watch = 'true';
		}

		ctx.protectProcessApi = new Morebits.wiki.api("protecting page...", query, ctx.onProtectSuccess, ctx.statusElement, ctx.onProtectFailure);
		ctx.protectProcessApi.setParent(this);
		ctx.protectProcessApi.post();
	};

	var fnProcessStabilize = function() {
		var xml = ctx.stabilizeApi.getXML();

		var missing = ($(xml).find('page').attr('missing') === "");
		if (missing) {
			ctx.statusElement.error("Cannot protect the page, because it no longer exists");
			ctx.onStabilizeFailure(this);
			return;
		}

		var stabilizeToken = $(xml).find('page').attr('edittoken');
		if (!stabilizeToken) {
			ctx.statusElement.error("Failed to retrieve stabilize token.");
			ctx.onStabilizeFailure(this);
			return;
		}

		var query = {
			action: 'stabilize',
			title: $(xml).find('page').attr('title'),
			token: stabilizeToken,
			protectlevel: ctx.flaggedRevs.level,
			expiry: ctx.flaggedRevs.expiry,
			reason: ctx.editSummary
		};
		if (ctx.watchlistOption === 'watch') {
			query.watch = 'true';
		}

		ctx.stabilizeProcessApi = new Morebits.wiki.api("configuring stabilization settings...", query, ctx.onStabilizeSuccess, ctx.statusElement, ctx.onStabilizeFailure);
		ctx.stabilizeProcessApi.setParent(this);
		ctx.stabilizeProcessApi.post();
	};
}; // end Morebits.wiki.page

/** Morebits.wiki.page TODO: (XXX)
 * - Should we retry loads also?
 * - Need to reset current action before the save?
 * - Deal with action.completed stuff
 * - Need to reset all parameters once done (e.g. edit summary, move destination, etc.)
 */



/**
 * **************** Morebits.wiki.preview ****************
 * Uses the API to parse a fragment of wikitext and render it as HTML.
 *
 * Constructor: Morebits.wiki.preview(previewbox, currentAction)
 *    previewbox - the <div> element that will contain the rendered HTML
 *
 * beginRender(wikitext): Displays the preview box, and begins an asynchronous attempt
 *                        to render the specified wikitext.
 *    wikitext - wikitext to render; most things should work, including subst: and ~~~~
 *
 * closePreview(): Hides the preview box and clears it.
 *
 * The suggested implementation pattern (in Morebits.simpleWindow + Morebits.quickForm situations) is to
 * construct a Morebits.wiki.preview object after rendering a Morebits.quickForm, and bind the object
 * to an arbitrary property of the form (e.g. |previewer|).  For an example, see
 * twinklewarn.js.
 */

Morebits.wiki.preview = function(previewbox) {
	this.previewbox = previewbox;
	$(previewbox).addClass("morebits-previewbox").hide();

	this.beginRender = function(wikitext) {
		$(previewbox).show();

		var statusspan = document.createElement('span');
		previewbox.appendChild(statusspan);
		Morebits.status.init(statusspan);

		var query = {
			action: 'parse',
			prop: 'text',
			pst: 'true',  // PST = pre-save transform; this makes substitution work properly
			text: wikitext,
			title: mw.config.get('wgPageName')
		};
		var renderApi = new Morebits.wiki.api("loading...", query, fnRenderSuccess, new Morebits.status("Preview"));
		renderApi.post();
	};

	var fnRenderSuccess = function(apiobj) {
		var xml = apiobj.getXML();
		var html = $(xml).find('text').text();
		if (!html) {
			apiobj.statelem.error("failed to retrieve preview, or template was blanked");
			return;
		}
		previewbox.innerHTML = html;
	};

	this.closePreview = function() {
		$(previewbox).empty().hide();
	};
};



/**
 * **************** Morebits.wikitext ****************
 * Wikitext manipulation
 */

Morebits.wikitext = {};

Morebits.wikitext.template = {
	parse: function( text, start ) {
		var count = -1;
		var level = -1;
		var equals = -1;
		var current = '';
		var result = {
			name: '',
			parameters: {}
		};
		var key, value;

		for( var i = start; i < text.length; ++i ) {
			var test3 = text.substr( i, 3 );
			if( test3 === '{{{' ) {
				current += '{{{';
				i += 2;
				++level;
				continue;
			}
			if( test3 === '}}}' ) {
				current += '}}}';
				i += 2;
				--level;
				continue;
			}
			var test2 = text.substr( i, 2 );
			if( test2 === '{{' || test2 === '[[' ) {
				current += test2;
				++i;
				++level;
				continue;
			}
			if( test2 === '[[' ) {
				current += test2;
				++i;
				--level;
				continue;
			}
			if( test2 === '}}' ) {
				current += test2;
				++i;
				--level;

				if( level <= 0 ) {
					if( count === -1 ) {
						result.name = current.substring(2).trim();
						++count;
					} else {
						if( equals !== -1 ) {
							key = current.substring( 0, equals ).trim();
							value = current.substring( equals ).trim();
							result.parameters[key] = value;
							equals = -1;
						} else {
							result.parameters[count] = current;
							++count;
						}
					}
					break;
				}
				continue;
			}

			if( text.charAt(i) === '|' && level <= 0 ) {
				if( count === -1 ) {
					result.name = current.substring(2).trim();
					++count;
				} else {
					if( equals !== -1 ) {
						key = current.substring( 0, equals ).trim();
						value = current.substring( equals + 1 ).trim();
						result.parameters[key] = value;
						equals = -1;
					} else {
						result.parameters[count] = current;
						++count;
					}
				}
				current = '';
			} else if( equals === -1 && text.charAt(i) === '=' && level <= 0 ) {
				equals = current.length;
				current += text.charAt(i);
			} else {
				current += text.charAt(i);
			}
		}

		return result;
	}
};

Morebits.wikitext.page = function mediawikiPage( text ) {
	this.text = text;
};

Morebits.wikitext.page.prototype = {
	text: '',
	removeLink: function( link_target ) {
		var first_char = link_target.substr( 0, 1 );
		var link_re_string = "[" + first_char.toUpperCase() + first_char.toLowerCase() + ']' +  RegExp.escape( link_target.substr( 1 ), true );
		var link_simple_re = new RegExp( "\\[\\[:?(" + link_re_string + ")\\]\\]", 'g' );
		var link_named_re = new RegExp( "\\[\\[:?" + link_re_string + "\\|(.+?)\\]\\]", 'g' );
		this.text = this.text.replace( link_simple_re, "$1" ).replace( link_named_re, "$1" );
	},
	commentOutImage: function( image, reason ) {
		var unbinder = new Morebits.unbinder( this.text );
		unbinder.unbind( '<!--', '-->' );

		reason = reason ? (reason + ': ') : '';
		var first_char = image.substr( 0, 1 );
		var image_re_string = "[" + first_char.toUpperCase() + first_char.toLowerCase() + ']' +  RegExp.escape( image.substr( 1 ), true ); 

		/*
		 * Check for normal image links, i.e. [[Image:Foobar.png|...]]
		 * Will eat the whole link
		 */
		var links_re = new RegExp( "\\[\\[(?:[Ii]mage|[Ff]ile):\\s*" + image_re_string );
		var allLinks = Morebits.array.uniq(Morebits.string.splitWeightedByKeys( unbinder.content, '[[', ']]' ));
		for( var i = 0; i < allLinks.length; ++i ) {
			if( links_re.test( allLinks[i] ) ) {
				var replacement = '<!-- ' + reason + allLinks[i] + ' -->';
				unbinder.content = unbinder.content.replace( allLinks[i], replacement, 'g' );
			}
		}
		// unbind the newly created comments
		unbinder.unbind( '<!--', '-->' );

		/*
		 * Check for gallery images, i.e. instances that must start on a new line, eventually preceded with some space, and must include Image: prefix
		 * Will eat the whole line.
		 */
		var gallery_image_re = new RegExp( "(^\\s*(?:[Ii]mage|[Ff]ile):\\s*" + image_re_string + ".*?$)", 'mg' );
		unbinder.content.replace( gallery_image_re, "<!-- " + reason + "$1 -->" );

		// unbind the newly created comments
		unbinder.unbind( '<!--', '-->' );
		/*
		 * Check free image usages, for example as template arguments, might have the Image: prefix excluded, but must be preceeded by an |
		 * Will only eat the image name and the preceeding bar and an eventual named parameter
		 */
		var free_image_re = new RegExp( "(\\|\\s*(?:[\\w\\s]+\\=)?\\s*(?:(?:[Ii]mage|[Ff]ile):\\s*)?" + image_re_string + ")", 'mg' );
		unbinder.content.replace( free_image_re, "<!-- " + reason + "$1 -->" );

		// Rebind the content now, we are done!
		this.text = unbinder.rebind();
	},
	addToImageComment: function( image, data ) {
		var first_char = image.substr( 0, 1 );
		var first_char_regex = RegExp.escape( first_char, true );
		if( first_char.toUpperCase() !== first_char.toLowerCase() ) {
			first_char_regex = '[' + RegExp.escape( first_char.toUpperCase(), true ) + RegExp.escape( first_char.toLowerCase(), true ) + ']';
		}
		var image_re_string = "(?:[Ii]mage|[Ff]ile):\\s*" + first_char_regex + RegExp.escape( image.substr( 1 ), true );
		var links_re = new RegExp( "\\[\\[" + image_re_string );
		var allLinks = Morebits.array.uniq(Morebits.string.splitWeightedByKeys( this.text, '[[', ']]' ));
		for( var i = 0; i < allLinks.length; ++i ) {
			if( links_re.test( allLinks[i] ) ) {
				var replacement = allLinks[i];
				// just put it at the end?
				replacement = replacement.replace( /\]\]$/, '|' + data + ']]' );
				this.text = this.text.replace( allLinks[i], replacement, 'g' );
			}
		}
		var gallery_re = new RegExp( "^(\\s*" + image_re_string + '.*?)\\|?(.*?)$', 'mg' );
		var newtext = "$1|$2 " + data;
		this.text = this.text.replace( gallery_re, newtext );
	},
	removeTemplate: function( template ) {
		var first_char = template.substr( 0, 1 );
		var template_re_string = "(?:[Tt]emplate:)?\\s*[" + first_char.toUpperCase() + first_char.toLowerCase() + ']' +  RegExp.escape( template.substr( 1 ), true ); 
		var links_re = new RegExp( "\\{\\{" + template_re_string );
		var allTemplates = Morebits.array.uniq(Morebits.string.splitWeightedByKeys( this.text, '{{', '}}', [ '{{{', '}}}' ] ));
		for( var i = 0; i < allTemplates.length; ++i ) {
			if( links_re.test( allTemplates[i] ) ) {
				this.text = this.text.replace( allTemplates[i], '', 'g' );
			}
		}
	},
	getText: function() {
		return this.text;
	}
};



/**
 * **************** Morebits.queryString ****************
 * Maps the querystring to an object
 *
 * Functions:
 *
 * Morebits.queryString.exists(key)
 *     returns true if the particular key is set
 * Morebits.queryString.get(key)
 *     returns the value associated to the key
 * Morebits.queryString.equals(key, value)
 *     returns true if the value associated with given key equals given value
 * Morebits.queryString.toString()
 *     returns the query string as a string
 * Morebits.queryString.create( hash )
 *     creates an querystring and encodes strings via encodeURIComponent and joins arrays with | 
 *
 * In static context, the value of location.search.substring(1), else the value given to the constructor is going to be used. The mapped hash is saved in the object.
 *
 * Example:
 *
 * var value = Morebits.queryString.get('key');
 * var obj = new Morebits.queryString('foo=bar&baz=quux');
 * value = obj.get('foo');
 */
Morebits.queryString = function QueryString(qString) {
	this.string = qString;
	this.params = {};

	if( !qString.length ) {
		return;
	}

	qString.replace(/\+/, ' ');
	var args = qString.split('&');

	for( var i = 0; i < args.length; ++i ) {
		var pair = args[i].split( '=' );
		var key = decodeURIComponent( pair[0] ), value = key;

		if( pair.length === 2 ) {
			value = decodeURIComponent( pair[1] );
		}

		this.params[key] = value;
	}
};

Morebits.queryString.staticstr = null;

Morebits.queryString.staticInit = function() {
	if( !Morebits.queryString.staticstr ) {
		Morebits.queryString.staticstr = new Morebits.queryString(location.search.substring(1));
	}
};

Morebits.queryString.get = function(key) {
	Morebits.queryString.staticInit();
	return Morebits.queryString.staticstr.get(key);
};

Morebits.queryString.prototype.get = function(key) {
	return this.params[key] ? this.params[key] : null;
};

Morebits.queryString.exists = function(key) {
	Morebits.queryString.staticInit();
	return Morebits.queryString.staticstr.exists(key);
};

Morebits.queryString.prototype.exists = function(key) {
	return this.params[key] ? true : false;
};

Morebits.queryString.equals = function(key, value) {
	Morebits.queryString.staticInit();
	return Morebits.queryString.staticstr.equals(key, value);
};

Morebits.queryString.prototype.equals = function(key, value) {
	return this.params[key] === value ? true : false;
};

Morebits.queryString.toString = function() {
	Morebits.queryString.staticInit();
	return Morebits.queryString.staticstr.toString();
};

Morebits.queryString.prototype.toString = function() {
	return this.string ? this.string : null;
};

Morebits.queryString.create = function( arr ) {
	var resarr = [];
	var editToken;  // KLUGE: this should always be the last item in the query string (bug TW-B-0013)
	for( var i in arr ) {
		if( arr[i] === undefined ) {
			continue;
		}
		var res;
		if( $.isArray( arr[i] ) ){
			var v = [];
			for(var j = 0; j < arr[i].length; ++j ) {
				v[j] = encodeURIComponent( arr[i][j] );
			}
			res = v.join('|');
		} else {
			res = encodeURIComponent( arr[i] );
		}
		if( i === 'token' ) {
			editToken = res;
		} else {
			resarr.push( encodeURIComponent( i ) + '=' + res );
		}
	}
	if( editToken !== undefined ) {
		resarr.push( 'token=' + editToken );
	}
	return resarr.join('&');
};
Morebits.queryString.prototype.create = Morebits.queryString.create;



/**
 * **************** Morebits.status ****************
 */

Morebits.status = function Status( text, stat, type ) {
	this.textRaw = text;
	this.text = this.codify(text);
	this.type = type || 'status';
	this.generate(); 
	if( stat ) {
		this.update( stat, type );
	}
};

Morebits.status.init = function( root ) {
	if( !( root instanceof Element ) ) {
		throw new Error( 'object not an instance of Element' );
	}
	while( root.hasChildNodes() ) {
		root.removeChild( root.firstChild );
	}
	Morebits.status.root = root;
	Morebits.status.errorEvent = null;
};

Morebits.status.root = null;

Morebits.status.onError = function( handler ) {
	if ( $.isFunction( handler ) ) {
		Morebits.status.errorEvent = handler;
	} else {
		throw "Morebits.status.onError: handler is not a function";
	}
};

Morebits.status.prototype = {
	stat: null,
	text: null,
	textRaw: null,
	type: 'status',
	target: null,
	node: null,
	linked: false,
	link: function() {
		if( ! this.linked && Morebits.status.root ) {
			Morebits.status.root.appendChild( this.node );
			this.linked = true;
		}
	},
	unlink: function() {
		if( this.linked ) {
			Morebits.status.root.removeChild( this.node );
			this.linked = false;
		}
	},
	codify: function( obj ) {
		if ( ! $.isArray( obj ) ) {
			obj = [ obj ];
		}
		var result;
		result = document.createDocumentFragment();
		for( var i = 0; i < obj.length; ++i ) {
			if( typeof obj[i] === 'string' ) {
				result.appendChild( document.createTextNode( obj[i] ) );
			} else if( obj[i] instanceof Element ) {
				result.appendChild( obj[i] );
			} // Else cosmic radiation made something shit
		}
		return result;

	},
	update: function( status, type ) {
		this.stat = this.codify( status );
		if( type ) {
			this.type = type;
			if (type === 'error') {
				// hack to force the page not to reload when an error is output - see also Morebits.status() above
				Morebits.wiki.numberOfActionsLeft = 1000;
				// call error callback
				if (Morebits.status.errorEvent) {
					Morebits.status.errorEvent();
				}
				// also log error messages in the browser console
				if (console && console.error) {
					console.error(this.textRaw + ": " + status);
				}
			}
		}
		this.render();
	},
	generate: function() {
		this.node = document.createElement( 'div' );
		this.node.appendChild( document.createElement('span') ).appendChild( this.text );
		this.node.appendChild( document.createElement('span') ).appendChild( document.createTextNode( ': ' ) );
		this.target = this.node.appendChild( document.createElement( 'span' ) );
		this.target.appendChild(  document.createTextNode( '' ) ); // dummy node
	},
	render: function() {
		this.node.className = 'tw_status_' + this.type;
		while( this.target.hasChildNodes() ) {
			this.target.removeChild( this.target.firstChild );
		}
		this.target.appendChild( this.stat );
		this.link();
	},
	status: function( status ) {
		this.update( status, 'status');
	},
	info: function( status ) {
		this.update( status, 'info');
	},
	warn: function( status ) {
		this.update( status, 'warn');
	},
	error: function( status ) {
		this.update( status, 'error');
	}
};

Morebits.status.info = function( text, status ) {
	return new Morebits.status( text, status, 'info' );
};

Morebits.status.warn = function( text, status ) {
	return new Morebits.status( text, status, 'warn' );
};

Morebits.status.error = function( text, status ) {
	return new Morebits.status( text, status, 'error' );
};



/**
 * **************** Morebits.htmlNode() ****************
 * Simple helper function to create a simple node
 */

Morebits.htmlNode = function ( type, content, color ) {
	var node = document.createElement( type );
	if( color ) {
		node.style.color = color;
	}
	node.appendChild( document.createTextNode( content ) );
	return node;
}



/**
 * **************** Morebits.simpleWindow ****************
 * A simple draggable window
 * now a wrapper for jQuery UI's dialog feature
 */

// The height passed in here is the maximum allowable height for the content area.
Morebits.simpleWindow = function SimpleWindow( width, height ) {
	var content = document.createElement( 'div' );
	this.content = content;
	content.className = 'morebits-dialog-content';

	this.height = height;

	$(this.content).dialog({
			autoOpen: false,
			buttons: { "Placeholder button": function() {} },
			dialogClass: 'morebits-dialog',
			width: Math.min(parseInt(window.innerWidth, 10), parseInt(width ? width : 800, 10)),
			// give jQuery the given height value (which represents the anticipated height of the dialog) here, so
			// it can position the dialog appropriately
			// the 20 pixels represents adjustment for the extra height of the jQuery dialog "chrome", compared
			// to that of the old SimpleWindow
			height: height + 20,
			close: function(event, ui) {
				// dialogs and their content can be destroyed once closed
				$(event.target).dialog("destroy").remove();
			},
			resize: function(event, ui) {
				this.style.maxHeight = "";
			}
		});

	var $widget = $(this.content).dialog("widget");

	// add background gradient to titlebar
	var $titlebar = $widget.find(".ui-dialog-titlebar");
	var oldstyle = $titlebar.attr("style");
	$titlebar.attr("style", (oldstyle ? oldstyle : "") + '; background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAEAAAAkCAMAAAB%2FqqA%2BAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAEhQTFRFr73ZobTPusjdsMHZp7nVwtDhzNbnwM3fu8jdq7vUt8nbxtDkw9DhpbfSvMrfssPZqLvVztbno7bRrr7W1d%2Fs1N7qydXk0NjpkW7Q%2BgAAADVJREFUeNoMwgESQCAAAMGLkEIi%2FP%2BnbnbpdB59app5Vdg0sXAoMZCpGoFbK6ciuy6FX4ABAEyoAef0BXOXAAAAAElFTkSuQmCC) !important;');

	// delete the placeholder button (it's only there so the buttonpane gets created)
	$widget.find("button").each(function(key, value) {
		value.parentNode.removeChild(value);
	});

	// add container for the buttons we add, and the footer links (if any)
	var buttonspan = document.createElement("span");
	buttonspan.className = "morebits-dialog-buttons";
	var linksspan = document.createElement("span");
	linksspan.className = "morebits-dialog-footerlinks";
	$widget.find(".ui-dialog-buttonpane").append(buttonspan, linksspan);
};

Morebits.simpleWindow.prototype = {
	buttons: [],
	height: 600,
	hasFooterLinks: false,
	scriptName: null,

	// Focuses the dialog. This might work, or on the contrary, it might not.
	focus: function(event) {
		$(this.content).dialog("moveToTop");

		return this;
	},
	// Closes the dialog.  If this is set as an event handler, it will stop the event from doing anything more.
	close: function(event) {
		if (event) {
			event.preventDefault();
		}
		$(this.content).dialog("close");

		return this;
	},
	// Shows the dialog.  Calling display() on a dialog that has previously been closed might work, but it is not guaranteed.
	display: function() {
		if (this.scriptName) {
			var $widget = $(this.content).dialog("widget");
			$widget.find(".morebits-dialog-scriptname").remove();
			var scriptnamespan = document.createElement("span");
			scriptnamespan.className = "morebits-dialog-scriptname";
			scriptnamespan.textContent = this.scriptName + " \u00B7 ";  // U+00B7 MIDDLE DOT = &middot;
			$widget.find(".ui-dialog-title").prepend(scriptnamespan);
		}

		var dialog = $(this.content).dialog("open");
		if (window.setupTooltips && window.pg && window.pg.re && window.pg.re.diff) {  // tie in with NAVPOP
			dialog.parent()[0].ranSetupTooltipsAlready = false;
			setupTooltips(dialog.parent()[0]);
		}
		this.setHeight( this.height );  // init height algorithm

		return this;
	},
	// Sets the dialog title.
	setTitle: function( title ) {
		$(this.content).dialog("option", "title", title);

		return this;
	},
	// Sets the script name, appearing as a prefix to the title to help users determine which
	// user script is producing which dialog. For instance, Twinkle modules set this to "Twinkle".
	setScriptName: function( name ) {
		this.scriptName = name;

		return this;
	},
	// Sets the dialog width.
	setWidth: function( width ) {
		$(this.content).dialog("option", "width", width);

		return this;
	},
	// Sets the dialog's maximum height. The dialog will auto-size to fit its contents,
	// but the content area will grow no larger than the height given here.
	setHeight: function( height ) {
		this.height = height;

		// from display time onwards, let the browser determine the optimum height, and instead limit the height at the given value
		// note that the given height will exclude the approx. 20px that the jQuery UI chrome has in height in addition to the height
		// of an equivalent "classic" Morebits.simpleWindow
		if (parseInt(getComputedStyle($(this.content).dialog("widget")[0], null).height, 10) > window.innerHeight) {
			$(this.content).dialog("option", "height", window.innerHeight - 2).dialog("option", "position", "top");
		} else {
			$(this.content).dialog("option", "height", "auto");
		}
		$(this.content).dialog("widget").find(".morebits-dialog-content")[0].style.maxHeight = parseInt(this.height - 30, 10) + "px";

		return this;
	},
	// Sets the content of the dialog to the given element node, usually from rendering a Morebits.quickForm.
	// Re-enumerates the footer buttons, but leaves the footer links as they are.
	// Be sure to call this at least once before the dialog is displayed...
	setContent: function( content ) {
		this.purgeContent();
		this.addContent( content );

		return this;
	},
	addContent: function( content ) {
		this.content.appendChild( content );

		// look for submit buttons in the content, hide them, and add a proxy button to the button pane
		var thisproxy = this;
		$(this.content).find('input[type="submit"], button[type="submit"]').each(function(key, value) {
				value.style.display = "none";
				var button = document.createElement("button");
				button.textContent = (value.hasAttribute("value") ? value.getAttribute("value") : (value.textContent ? value.textContent : "Submit Query"));
				// here is an instance of cheap coding, probably a memory-usage hit in using a closure here
				button.addEventListener("click", function() { value.click(); }, false);
				thisproxy.buttons.push(button);
			});
		// remove all buttons from the button pane and re-add them
		if (this.buttons.length > 0) {
			$(this.content).dialog("widget").find(".morebits-dialog-buttons").empty().append(this.buttons)[0].removeAttribute("data-empty");
		} else {
			$(this.content).dialog("widget").find(".morebits-dialog-buttons")[0].setAttribute("data-empty", "data-empty");  // used by CSS
		}

		return this;
	},
	purgeContent: function( content ) {
		this.buttons = [];
		// delete all buttons in the buttonpane
		$(this.content).dialog("widget").find(".morebits-dialog-buttons").empty();

		while( this.content.hasChildNodes() ) {
			this.content.removeChild( this.content.firstChild );
		}

		return this;
	},
	// Adds a link in the bottom-right corner of the dialog.
	// This can be used to provide help or policy links.
	// For example, Twinkle's CSD module adds a link to the CSD policy page,
	// as well as a link to Twinkle's documentation.
	addFooterLink: function( text, wikiPage ) {
		var $footerlinks = $(this.content).dialog("widget").find(".morebits-dialog-footerlinks");
		if (this.hasFooterLinks) {
			var bullet = document.createElement("span");
			bullet.textContent = " \u2022 ";  // U+2022 BULLET
			$footerlinks.append(bullet);
		}
		var link = document.createElement("a");
		link.setAttribute("href", mw.util.getUrl(wikiPage) );
		link.setAttribute("title", wikiPage);
		link.setAttribute("target", "_blank");
		link.textContent = text;
		$footerlinks.append(link);
		this.hasFooterLinks = true;

		return this;
	},
	setModality: function( modal ) {
		$(this.content).dialog("option", "modal", modal);

		return this;
	}
};

// Enables or disables all footer buttons on all Morebits.simpleWindows in the current page.
// This should be called with |false| when the button(s) become irrelevant (e.g. just before Morebits.status.init is called).
// This is not an instance method so that consumers don't have to keep a reference to the original
// Morebits.simpleWindow object sitting around somewhere. Anyway, most of the time there will only be one
// Morebits.simpleWindow open, so this shouldn't matter.
Morebits.simpleWindow.setButtonsEnabled = function( enabled ) {
	$(".morebits-dialog-buttons button").attr("disabled", !enabled);
};


// Twinkle blacklist was removed per consensus at http://en.wikipedia.org/wiki/Wikipedia:Administrators%27_noticeboard/Archive221#New_Twinkle_blacklist_proposal



} ( window, document, jQuery )); // End wrap with anonymous function


/**
 * If this script is being executed outside a ResourceLoader context, we add some
 * global assignments for legacy scripts, hopefully these can be removed down the line
 *
 * IMPORTANT NOTE:
 * PLEASE DO NOT USE THESE ALIASES IN NEW CODE!
 * Thanks.
 */

if ( typeof arguments === "undefined" ) {  // typeof is here for a reason...
	window.SimpleWindow = Morebits.simpleWindow;
	window.QuickForm = Morebits.quickForm;
	window.Wikipedia = Morebits.wiki;
	window.Status = Morebits.status;
	window.QueryString = Morebits.queryString;
}


// </nowiki>