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[mediawiki.git] / resources / jquery / jquery.tablesorter.js

/**
 * TableSorter for MediaWiki
 *
 * Written 2011 Leo Koppelkamm
 * Based on tablesorter.com plugin, written (c) 2007 Christian Bach.
 *
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Depends on mw.config (wgDigitTransformTable, wgMonthNames, wgMonthNamesShort,
 * wgDefaultDateFormat, wgContentLanguage)
 * Uses 'tableSorterCollation' in mw.config (if available)
 */
/**
 *
 * @description Create a sortable table with multi-column sorting capabilitys
 *
 * @example $( 'table' ).tablesorter();
 * @desc Create a simple tablesorter interface.
 *
 * @example $( 'table' ).tablesorter( { sortList: [ { 0: 'desc' }, { 1: 'asc' } ] } );
 * @desc Create a tablesorter interface initially sorting on the first and second column.
 *
 * @option String cssHeader ( optional ) A string of the class name to be appended
 *         to sortable tr elements in the thead of the table. Default value:
 *         "header"
 *
 * @option String cssAsc ( optional ) A string of the class name to be appended to
 *         sortable tr elements in the thead on a ascending sort. Default value:
 *         "headerSortUp"
 *
 * @option String cssDesc ( optional ) A string of the class name to be appended
 *         to sortable tr elements in the thead on a descending sort. Default
 *         value: "headerSortDown"
 *
 * @option String sortInitialOrder ( optional ) A string of the inital sorting
 *         order can be asc or desc. Default value: "asc"
 *
 * @option String sortMultisortKey ( optional ) A string of the multi-column sort
 *         key. Default value: "shiftKey"
 *
 * @option Boolean sortLocaleCompare ( optional ) Boolean flag indicating whatever
 *         to use String.localeCampare method or not. Set to false.
 *
 * @option Boolean cancelSelection ( optional ) Boolean flag indicating if
 *         tablesorter should cancel selection of the table headers text.
 *         Default value: true
 *
 * @option Array sortList ( optional ) An array containing objects specifying sorting.
 *         By passing more than one object, multi-sorting will be applied. Object structure:
 *         { <Integer column index>: <String 'asc' or 'desc'> }
 *         Default value: []
 *
 * @option Boolean debug ( optional ) Boolean flag indicating if tablesorter
 *         should display debuging information usefull for development.
 *
 * @event sortEnd.tablesorter: Triggered as soon as any sorting has been applied.
 *
 * @type jQuery
 *
 * @name tablesorter
 *
 * @cat Plugins/Tablesorter
 *
 * @author Christian Bach/christian.bach@polyester.se
 */

( function ( $, mw ) {
        /*jshint onevar:false */

        /* Local scope */

        var ts,
                parsers = [];

        /* Parser utility functions */

        function getParserById( name ) {
                var len = parsers.length;
                for ( var i = 0; i < len; i++ ) {
                        if ( parsers[i].id.toLowerCase() === name.toLowerCase() ) {
                                return parsers[i];
                        }
                }
                return false;
        }

        function getElementSortKey( node ) {
                var $node = $( node ),
                        // Use data-sort-value attribute.
                        // Use data() instead of attr() so that live value changes
                        // are processed as well (bug 38152).
                        data = $node.data( 'sortValue' );

                if ( data !== null && data !== undefined ) {
                        // Cast any numbers or other stuff to a string, methods
                        // like charAt, toLowerCase and split are expected.
                        return String( data );
                } else {
                        if ( !node ) {
                                return $node.text();
                        } else if ( node.tagName.toLowerCase() === 'img' ) {
                                return $node.attr( 'alt' ) || ''; // handle undefined alt
                        } else {
                                return $.map( $.makeArray( node.childNodes ), function( elem ) {
                                        // 1 is for document.ELEMENT_NODE (the constant is undefined on old browsers)
                                        if ( elem.nodeType === 1 ) {
                                                return getElementSortKey( elem );
                                        } else {
                                                return $.text( elem );
                                        }
                                } ).join( '' );
                        }
                }
        }

        function detectParserForColumn( table, rows, cellIndex ) {
                var l = parsers.length,
                        nodeValue,
                        // Start with 1 because 0 is the fallback parser
                        i = 1,
                        rowIndex = 0,
                        concurrent = 0,
                        needed = ( rows.length > 4 ) ? 5 : rows.length;

                while ( i < l ) {
                        if ( rows[rowIndex] && rows[rowIndex].cells[cellIndex] ) {
                                nodeValue = $.trim( getElementSortKey( rows[rowIndex].cells[cellIndex] ) );
                        } else {
                                nodeValue = '';
                        }

                        if ( nodeValue !== '') {
                                if ( parsers[i].is( nodeValue, table ) ) {
                                        concurrent++;
                                        rowIndex++;
                                        if ( concurrent >= needed ) {
                                                // Confirmed the parser for multiple cells, let's return it
                                                return parsers[i];
                                        }
                                } else {
                                        // Check next parser, reset rows
                                        i++;
                                        rowIndex = 0;
                                        concurrent = 0;
                                }
                        } else {
                                // Empty cell
                                rowIndex++;
                                if ( rowIndex > rows.length ) {
                                        rowIndex = 0;
                                        i++;
                                }
                        }
                }

                // 0 is always the generic parser (text)
                return parsers[0];
        }

        function buildParserCache( table, $headers ) {
                var rows = table.tBodies[0].rows,
                        sortType,
                        parsers = [];

                if ( rows[0] ) {

                        var cells = rows[0].cells,
                                len = cells.length,
                                i, parser;

                        for ( i = 0; i < len; i++ ) {
                                parser = false;
                                sortType = $headers.eq( i ).data( 'sortType' );
                                if ( sortType !== undefined ) {
                                        parser = getParserById( sortType );
                                }

                                if ( parser === false ) {
                                        parser = detectParserForColumn( table, rows, i );
                                }

                                parsers.push( parser );
                        }
                }
                return parsers;
        }

        /* Other utility functions */

        function buildCache( table ) {
                var totalRows = ( table.tBodies[0] && table.tBodies[0].rows.length ) || 0,
                        totalCells = ( table.tBodies[0].rows[0] && table.tBodies[0].rows[0].cells.length ) || 0,
                        parsers = table.config.parsers,
                        cache = {
                                row: [],
                                normalized: []
                        };

                for ( var i = 0; i < totalRows; ++i ) {

                        // Add the table data to main data array
                        var $row = $( table.tBodies[0].rows[i] ),
                                cols = [];

                        // if this is a child row, add it to the last row's children and
                        // continue to the next row
                        if ( $row.hasClass( table.config.cssChildRow ) ) {
                                cache.row[cache.row.length - 1] = cache.row[cache.row.length - 1].add( $row );
                                // go to the next for loop
                                continue;
                        }

                        cache.row.push( $row );

                        for ( var j = 0; j < totalCells; ++j ) {
                                cols.push( parsers[j].format( getElementSortKey( $row[0].cells[j] ), table, $row[0].cells[j] ) );
                        }

                        cols.push( cache.normalized.length ); // add position for rowCache
                        cache.normalized.push( cols );
                        cols = null;
                }

                return cache;
        }

        function appendToTable( table, cache ) {
                var row = cache.row,
                        normalized = cache.normalized,
                        totalRows = normalized.length,
                        checkCell = ( normalized[0].length - 1 ),
                        fragment = document.createDocumentFragment();

                for ( var i = 0; i < totalRows; i++ ) {
                        var pos = normalized[i][checkCell];

                        var l = row[pos].length;

                        for ( var j = 0; j < l; j++ ) {
                                fragment.appendChild( row[pos][j] );
                        }

                }
                table.tBodies[0].appendChild( fragment );

                $( table ).trigger( 'sortEnd.tablesorter' );
        }

        /**
         * Find all header rows in a thead-less table and put them in a <thead> tag.
         * This only treats a row as a header row if it contains only <th>s (no <td>s)
         * and if it is preceded entirely by header rows. The algorithm stops when
         * it encounters the first non-header row.
         *
         * After this, it will look at all rows at the bottom for footer rows
         * And place these in a tfoot using similar rules.
         * @param $table jQuery object for a <table>
         */
        function emulateTHeadAndFoot( $table ) {
                var $rows = $table.find( '> tbody > tr' );
                if( !$table.get(0).tHead ) {
                        var $thead = $( '<thead>' );
                        $rows.each( function () {
                                if ( $(this).children( 'td' ).length > 0 ) {
                                        // This row contains a <td>, so it's not a header row
                                        // Stop here
                                        return false;
                                }
                                $thead.append( this );
                        } );
                        $table.find(' > tbody:first').before( $thead );
                }
                if( !$table.get(0).tFoot ) {
                        var $tfoot = $( '<tfoot>' );
                        var len = $rows.length;
                        for ( var i = len-1; i >= 0; i-- ) {
                                if( $( $rows[i] ).children( 'td' ).length > 0 ){
                                        break;
                                }
                                $tfoot.prepend( $( $rows[i] ));
                        }
                        $table.append( $tfoot );
                }
        }

        function buildHeaders( table, msg ) {
                var maxSeen = 0,
                        longest,
                        realCellIndex = 0,
                        $tableHeaders = $( 'thead:eq(0) > tr', table );
                if ( $tableHeaders.length > 1 ) {
                        $tableHeaders.each( function () {
                                if ( this.cells.length > maxSeen ) {
                                        maxSeen = this.cells.length;
                                        longest = this;
                                }
                        });
                        $tableHeaders = $( longest );
                }
                $tableHeaders = $tableHeaders.children( 'th' ).each( function ( index ) {
                        this.column = realCellIndex;

                        var colspan = this.colspan;
                        colspan = colspan ? parseInt( colspan, 10 ) : 1;
                        realCellIndex += colspan;

                        this.order = 0;
                        this.count = 0;

                        if ( $( this ).is( '.unsortable' ) ) {
                                this.sortDisabled = true;
                        }

                        if ( !this.sortDisabled ) {
                                $( this ).addClass( table.config.cssHeader ).attr( 'title', msg[1] );
                        }

                        // add cell to headerList
                        table.config.headerList[index] = this;
                } );

                return $tableHeaders;

        }

        /**
         * Sets the sort count of the columns that are not affected by the sorting to have them sorted
         * in default (ascending) order when their header cell is clicked the next time.
         *
         * @param {jQuery} $headers
         * @param {Number[][]} sortList
         * @param {Number[][]} headerToColumns
         */
        function setHeadersOrder( $headers, sortList, headerToColumns ) {
                // Loop through all headers to retrieve the indices of the columns the header spans across:
                $.each( headerToColumns, function( headerIndex, columns ) {

                        $.each( columns, function( i, columnIndex ) {
                                var header = $headers[headerIndex];

                                if ( !isValueInArray( columnIndex, sortList ) ) {
                                        // Column shall not be sorted: Reset header count and order.
                                        header.order = 0;
                                        header.count = 0;
                                } else {
                                        // Column shall be sorted: Apply designated count and order.
                                        $.each( sortList, function( j, sortColumn ) {
                                                if ( sortColumn[0] === i ) {
                                                        header.order = sortColumn[1];
                                                        header.count = sortColumn[1] + 1;
                                                        return false;
                                                }
                                        } );
                                }
                        } );

                } );
        }

        function isValueInArray( v, a ) {
                var l = a.length;
                for ( var i = 0; i < l; i++ ) {
                        if ( a[i][0] === v ) {
                                return true;
                        }
                }
                return false;
        }

        function setHeadersCss( table, $headers, list, css, msg, columnToHeader ) {
                // Remove all header information and reset titles to default message
                $headers.removeClass( css[0] ).removeClass( css[1] ).attr( 'title', msg[1] );

                for ( var i = 0; i < list.length; i++ ) {
                        $headers.eq( columnToHeader[ list[i][0] ] )
                                .addClass( css[ list[i][1] ] )
                                .attr( 'title', msg[ list[i][1] ] );
                }
        }

        function sortText( a, b ) {
                return ( (a < b) ? -1 : ((a > b) ? 1 : 0) );
        }

        function sortTextDesc( a, b ) {
                return ( (b < a) ? -1 : ((b > a) ? 1 : 0) );
        }

        function multisort( table, sortList, cache ) {
                var sortFn = [];
                var len = sortList.length;
                for ( var i = 0; i < len; i++ ) {
                        sortFn[i] = ( sortList[i][1] ) ? sortTextDesc : sortText;
                }
                cache.normalized.sort( function ( array1, array2 ) {
                        var col, ret;
                        for ( var i = 0; i < len; i++ ) {
                                col = sortList[i][0];
                                ret = sortFn[i].call( this, array1[col], array2[col] );
                                if ( ret !== 0 ) {
                                        return ret;
                                }
                        }
                        // Fall back to index number column to ensure stable sort
                        return sortText.call( this, array1[array1.length - 1], array2[array2.length - 1] );
                } );
                return cache;
        }

        function buildTransformTable() {
                var digits = '0123456789,.'.split( '' );
                var separatorTransformTable = mw.config.get( 'wgSeparatorTransformTable' );
                var digitTransformTable = mw.config.get( 'wgDigitTransformTable' );
                if ( separatorTransformTable === null || ( separatorTransformTable[0] === '' && digitTransformTable[2] === '' ) ) {
                        ts.transformTable = false;
                } else {
                        ts.transformTable = {};

                        // Unpack the transform table
                        var ascii = separatorTransformTable[0].split( '\t' ).concat( digitTransformTable[0].split( '\t' ) );
                        var localised = separatorTransformTable[1].split( '\t' ).concat( digitTransformTable[1].split( '\t' ) );

                        // Construct regex for number identification
                        for ( var i = 0; i < ascii.length; i++ ) {
                                ts.transformTable[localised[i]] = ascii[i];
                                digits.push( $.escapeRE( localised[i] ) );
                        }
                }
                var digitClass = '[' + digits.join( '', digits ) + ']';

                // We allow a trailing percent sign, which we just strip. This works fine
                // if percents and regular numbers aren't being mixed.
                ts.numberRegex = new RegExp('^(' + '[-+\u2212]?[0-9][0-9,]*(\\.[0-9,]*)?(E[-+\u2212]?[0-9][0-9,]*)?' + // Fortran-style scientific
                '|' + '[-+\u2212]?' + digitClass + '+[\\s\\xa0]*%?' + // Generic localised
                ')$', 'i');
        }

        function buildDateTable() {
                var regex = [];
                ts.monthNames = {};

                for ( var i = 1; i < 13; i++ ) {
                        var name = mw.config.get( 'wgMonthNames' )[i].toLowerCase();
                        ts.monthNames[name] = i;
                        regex.push( $.escapeRE( name ) );
                        name = mw.config.get( 'wgMonthNamesShort' )[i].toLowerCase().replace( '.', '' );
                        ts.monthNames[name] = i;
                        regex.push( $.escapeRE( name ) );
                }

                // Build piped string
                regex = regex.join( '|' );

                // Build RegEx
                // Any date formated with . , ' - or /
                ts.dateRegex[0] = new RegExp( /^\s*(\d{1,2})[\,\.\-\/'\s]{1,2}(\d{1,2})[\,\.\-\/'\s]{1,2}(\d{2,4})\s*?/i);

                // Written Month name, dmy
                ts.dateRegex[1] = new RegExp( '^\\s*(\\d{1,2})[\\,\\.\\-\\/\'\\s]+(' + regex + ')' + '[\\,\\.\\-\\/\'\\s]+(\\d{2,4})\\s*$', 'i' );

                // Written Month name, mdy
                ts.dateRegex[2] = new RegExp( '^\\s*(' + regex + ')' + '[\\,\\.\\-\\/\'\\s]+(\\d{1,2})[\\,\\.\\-\\/\'\\s]+(\\d{2,4})\\s*$', 'i' );

        }

        /**
         * Replace all rowspanned cells in the body with clones in each row, so sorting
         * need not worry about them.
         *
         * @param $table jQuery object for a <table>
         */
        function explodeRowspans( $table ) {
                var rowspanCells = $table.find( '> tbody > tr > [rowspan]' ).get();

                // Short circuit
                if ( !rowspanCells.length ) {
                        return;
                }

                // First, we need to make a property like cellIndex but taking into
                // account colspans. We also cache the rowIndex to avoid having to take
                // cell.parentNode.rowIndex in the sorting function below.
                $table.find( '> tbody > tr' ).each( function () {
                        var col = 0;
                        var l = this.cells.length;
                        for ( var i = 0; i < l; i++ ) {
                                this.cells[i].realCellIndex = col;
                                this.cells[i].realRowIndex = this.rowIndex;
                                col += this.cells[i].colSpan;
                        }
                } );

                // Split multi row cells into multiple cells with the same content.
                // Sort by column then row index to avoid problems with odd table structures.
                // Re-sort whenever a rowspanned cell's realCellIndex is changed, because it
                // might change the sort order.
                function resortCells() {
                        rowspanCells = rowspanCells.sort( function ( a, b ) {
                                var ret = a.realCellIndex - b.realCellIndex;
                                if ( !ret ) {
                                        ret = a.realRowIndex - b.realRowIndex;
                                }
                                return ret;
                        } );
                        $.each( rowspanCells, function () {
                                this.needResort = false;
                        } );
                }
                resortCells();

                var spanningRealCellIndex, rowSpan, colSpan;
                function filterfunc() {
                        return this.realCellIndex >= spanningRealCellIndex;
                }

                function fixTdCellIndex() {
                        this.realCellIndex += colSpan;
                        if ( this.rowSpan > 1 ) {
                                this.needResort = true;
                        }
                }

                while ( rowspanCells.length ) {
                        if ( rowspanCells[0].needResort ) {
                                resortCells();
                        }

                        var cell = rowspanCells.shift();
                        rowSpan = cell.rowSpan;
                        colSpan = cell.colSpan;
                        spanningRealCellIndex = cell.realCellIndex;
                        cell.rowSpan = 1;
                        var $nextRows = $( cell ).parent().nextAll();
                        for ( var i = 0; i < rowSpan - 1; i++ ) {
                                var $tds = $( $nextRows[i].cells ).filter( filterfunc );
                                var $clone = $( cell ).clone();
                                $clone[0].realCellIndex = spanningRealCellIndex;
                                if ( $tds.length ) {
                                        $tds.each( fixTdCellIndex );
                                        $tds.first().before( $clone );
                                } else {
                                        $nextRows.eq( i ).append( $clone );
                                }
                        }
                }
        }

        function buildCollationTable() {
                ts.collationTable = mw.config.get( 'tableSorterCollation' );
                ts.collationRegex = null;
                if ( ts.collationTable ) {
                        var keys = [];

                        // Build array of key names
                        for ( var key in ts.collationTable ) {
                                if ( ts.collationTable.hasOwnProperty(key) ) { //to be safe
                                        keys.push(key);
                                }
                        }
                        if (keys.length) {
                                ts.collationRegex = new RegExp( '[' + keys.join( '' ) + ']', 'ig' );
                        }
                }
        }

        function cacheRegexs() {
                if ( ts.rgx ) {
                        return;
                }
                ts.rgx = {
                        IPAddress: [
                                new RegExp( /^\d{1,3}[\.]\d{1,3}[\.]\d{1,3}[\.]\d{1,3}$/)
                        ],
                        currency: [
                                new RegExp( /(^[£$€¥]|[£$€¥]$)/),
                                new RegExp( /[£$€¥]/g)
                        ],
                        url: [
                                new RegExp( /^(https?|ftp|file):\/\/$/),
                                new RegExp( /(https?|ftp|file):\/\//)
                        ],
                        isoDate: [
                                new RegExp( /^\d{4}[\/\-]\d{1,2}[\/\-]\d{1,2}$/)
                        ],
                        usLongDate: [
                                new RegExp( /^[A-Za-z]{3,10}\.? [0-9]{1,2}, ([0-9]{4}|'?[0-9]{2}) (([0-2]?[0-9]:[0-5][0-9])|([0-1]?[0-9]:[0-5][0-9]\s(AM|PM)))$/)
                        ],
                        time: [
                                new RegExp( /^(([0-2]?[0-9]:[0-5][0-9])|([0-1]?[0-9]:[0-5][0-9]\s(am|pm)))$/)
                        ]
                };
        }

        /**
         * Converts sort objects [ { Integer: String }, ... ] to the internally used nested array
         * structure [ [ Integer , Integer ], ... ]
         *
         * @param sortObjects {Array} List of sort objects.
         * @return {Array} List of internal sort definitions.
         */

        function convertSortList( sortObjects ) {
                var sortList = [];
                $.each( sortObjects, function( i, sortObject ) {
                        $.each ( sortObject, function( columnIndex, order ) {
                                var orderIndex = ( order === 'desc' ) ? 1 : 0;
                                sortList.push( [parseInt( columnIndex, 10 ), orderIndex] );
                        } );
                } );
                return sortList;
        }

        /* Public scope */

        $.tablesorter = {

                        defaultOptions: {
                                cssHeader: 'headerSort',
                                cssAsc: 'headerSortUp',
                                cssDesc: 'headerSortDown',
                                cssChildRow: 'expand-child',
                                sortInitialOrder: 'asc',
                                sortMultiSortKey: 'shiftKey',
                                sortLocaleCompare: false,
                                parsers: {},
                                widgets: [],
                                headers: {},
                                cancelSelection: true,
                                sortList: [],
                                headerList: [],
                                selectorHeaders: 'thead tr:eq(0) th',
                                debug: false
                        },

                        dateRegex: [],
                        monthNames: {},

                        /**
                         * @param $tables {jQuery}
                         * @param settings {Object} (optional)
                         */
                        construct: function ( $tables, settings ) {
                                return $tables.each( function ( i, table ) {
                                        // Declare and cache.
                                        var $headers, cache, config,
                                                headerToColumns, columnToHeader, colspanOffset,
                                                $table = $( table ),
                                                firstTime = true;

                                        // Quit if no tbody
                                        if ( !table.tBodies ) {
                                                return;
                                        }
                                        if ( !table.tHead ) {
                                                // No thead found. Look for rows with <th>s and
                                                // move them into a <thead> tag or a <tfoot> tag
                                                emulateTHeadAndFoot( $table );

                                                // Still no thead? Then quit
                                                if ( !table.tHead ) {
                                                        return;
                                                }
                                        }
                                        $table.addClass( 'jquery-tablesorter' );

                                        // FIXME config should probably not be stored in the plain table node
                                        // New config object.
                                        table.config = {};

                                        // Merge and extend.
                                        config = $.extend( table.config, $.tablesorter.defaultOptions, settings );

                                        // Save the settings where they read
                                        $.data( table, 'tablesorter', { config: config } );

                                        // Get the CSS class names, could be done else where.
                                        var sortCSS = [ config.cssDesc, config.cssAsc ];
                                        var sortMsg = [ mw.msg( 'sort-descending' ), mw.msg( 'sort-ascending' ) ];

                                        // Build headers
                                        $headers = buildHeaders( table, sortMsg );

                                        // Grab and process locale settings
                                        buildTransformTable();
                                        buildDateTable();
                                        buildCollationTable();

                                        // Precaching regexps can bring 10 fold
                                        // performance improvements in some browsers.
                                        cacheRegexs();

                                        function setupForFirstSort() {
                                                firstTime = false;

                                                // Legacy fix of .sortbottoms
                                                // Wrap them inside inside a tfoot (because that's what they actually want to be) &
                                                // and put the <tfoot> at the end of the <table>
                                                var $sortbottoms = $table.find( '> tbody > tr.sortbottom' );
                                                if ( $sortbottoms.length ) {
                                                        var $tfoot = $table.children( 'tfoot' );
                                                        if ( $tfoot.length ) {
                                                                $tfoot.eq(0).prepend( $sortbottoms );
                                                        } else {
                                                                $table.append( $( '<tfoot>' ).append( $sortbottoms ) );
                                                        }
                                                }

                                                explodeRowspans( $table );

                                                // try to auto detect column type, and store in tables config
                                                table.config.parsers = buildParserCache( table, $headers );
                                        }

                                        // as each header can span over multiple columns (using colspan=N),
                                        // we have to bidirectionally map headers to their columns and columns to their headers
                                        headerToColumns = [];
                                        columnToHeader = [];
                                        colspanOffset = 0;
                                        $headers.each( function ( headerIndex ) {
                                                var columns = [];
                                                for ( var i = 0; i < this.colSpan; i++ ) {
                                                        columnToHeader[ colspanOffset + i ] = headerIndex;
                                                        columns.push( colspanOffset + i );
                                                }

                                                headerToColumns[ headerIndex ] = columns;
                                                colspanOffset += this.colSpan;
                                        } );

                                        // Apply event handling to headers
                                        // this is too big, perhaps break it out?
                                        $headers.filter( ':not(.unsortable)' ).click( function ( e ) {
                                                if ( e.target.nodeName.toLowerCase() === 'a' ) {
                                                        // The user clicked on a link inside a table header
                                                        // Do nothing and let the default link click action continue
                                                        return true;
                                                }

                                                if ( firstTime ) {
                                                        setupForFirstSort();
                                                }

                                                // Build the cache for the tbody cells
                                                // to share between calculations for this sort action.
                                                // Re-calculated each time a sort action is performed due to possiblity
                                                // that sort values change. Shouldn't be too expensive, but if it becomes
                                                // too slow an event based system should be implemented somehow where
                                                // cells get event .change() and bubbles up to the <table> here
                                                cache = buildCache( table );

                                                var totalRows = ( $table[0].tBodies[0] && $table[0].tBodies[0].rows.length ) || 0;
                                                if ( !table.sortDisabled && totalRows > 0 ) {
                                                        // Get current column sort order
                                                        this.order = this.count % 2;
                                                        this.count++;

                                                        var cell = this;
                                                        // Get current column index
                                                        var columns = headerToColumns[this.column];
                                                        var newSortList = $.map( columns, function (c) {
                                                                // jQuery "helpfully" flattens the arrays...
                                                                return [[c, cell.order]];
                                                        });
                                                        // Index of first column belonging to this header
                                                        var i = columns[0];

                                                        if ( !e[config.sortMultiSortKey] ) {
                                                                // User only wants to sort on one column set
                                                                // Flush the sort list and add new columns
                                                                config.sortList = newSortList;
                                                        } else {
                                                                // Multi column sorting
                                                                // It is not possible for one column to belong to multiple headers,
                                                                // so this is okay - we don't need to check for every value in the columns array
                                                                if ( isValueInArray( i, config.sortList ) ) {
                                                                        // The user has clicked on an already sorted column.
                                                                        // Reverse the sorting direction for all tables.
                                                                        for ( var j = 0; j < config.sortList.length; j++ ) {
                                                                                var s = config.sortList[j],
                                                                                        o = config.headerList[s[0]];
                                                                                if ( isValueInArray( s[0], newSortList ) ) {
                                                                                        o.count = s[1];
                                                                                        o.count++;
                                                                                        s[1] = o.count % 2;
                                                                                }
                                                                        }
                                                                } else {
                                                                        // Add columns to sort list array
                                                                        config.sortList = config.sortList.concat( newSortList );
                                                                }
                                                        }

                                                        // Reset order/counts of cells not affected by sorting
                                                        setHeadersOrder( $headers, config.sortList, headerToColumns );

                                                        // Set CSS for headers
                                                        setHeadersCss( $table[0], $headers, config.sortList, sortCSS, sortMsg, columnToHeader );
                                                        appendToTable(
                                                                $table[0], multisort( $table[0], config.sortList, cache )
                                                        );

                                                        // Stop normal event by returning false
                                                        return false;
                                                }

                                        // Cancel selection
                                        } ).mousedown( function () {
                                                if ( config.cancelSelection ) {
                                                        this.onselectstart = function () {
                                                                return false;
                                                        };
                                                        return false;
                                                }
                                        } );

                                        /**
                                         * Sorts the table. If no sorting is specified by passing a list of sort
                                         * objects, the table is sorted according to the initial sorting order.
                                         * Passing an empty array will reset sorting (basically just reset the headers
                                         * making the table appear unsorted).
                                         *
                                         * @param sortList {Array} (optional) List of sort objects.
                                         */
                                        $table.data( 'tablesorter' ).sort = function( sortList ) {

                                                if ( firstTime ) {
                                                        setupForFirstSort();
                                                }

                                                if ( sortList === undefined ) {
                                                        sortList = config.sortList;
                                                } else if ( sortList.length > 0 ) {
                                                        sortList = convertSortList( sortList );
                                                }

                                                // Set each column's sort count to be able to determine the correct sort
                                                // order when clicking on a header cell the next time
                                                setHeadersOrder( $headers, sortList, headerToColumns );

                                                // re-build the cache for the tbody cells
                                                cache = buildCache( table );

                                                // set css for headers
                                                setHeadersCss( table, $headers, sortList, sortCSS, sortMsg, columnToHeader );

                                                // sort the table and append it to the dom
                                                appendToTable( table, multisort( table, sortList, cache ) );
                                        };

                                        // sort initially
                                        if ( config.sortList.length > 0 ) {
                                                setupForFirstSort();
                                                config.sortList = convertSortList( config.sortList );
                                                $table.data( 'tablesorter' ).sort();
                                        }

                                } );
                        },

                        addParser: function ( parser ) {
                                var l = parsers.length,
                                        a = true;
                                for ( var i = 0; i < l; i++ ) {
                                        if ( parsers[i].id.toLowerCase() === parser.id.toLowerCase() ) {
                                                a = false;
                                        }
                                }
                                if ( a ) {
                                        parsers.push( parser );
                                }
                        },

                        formatDigit: function ( s ) {
                                var out, c, p, i;
                                if ( ts.transformTable !== false ) {
                                        out = '';
                                        for ( p = 0; p < s.length; p++ ) {
                                                c = s.charAt(p);
                                                if ( c in ts.transformTable ) {
                                                        out += ts.transformTable[c];
                                                } else {
                                                        out += c;
                                                }
                                        }
                                        s = out;
                                }
                                i = parseFloat( s.replace( /[, ]/g, '' ).replace( '\u2212', '-' ) );
                                return isNaN( i ) ? 0 : i;
                        },

                        formatFloat: function ( s ) {
                                var i = parseFloat(s);
                                return isNaN( i ) ? 0 : i;
                        },

                        formatInt: function ( s ) {
                                var i = parseInt( s, 10 );
                                return isNaN( i ) ? 0 : i;
                        },

                        clearTableBody: function ( table ) {
                                $( table.tBodies[0] ).empty();
                        }
                };

        // Shortcut
        ts = $.tablesorter;

        // Register as jQuery prototype method
        $.fn.tablesorter = function ( settings ) {
                return ts.construct( this, settings );
        };

        // Add default parsers
        ts.addParser( {
                id: 'text',
                is: function () {
                        return true;
                },
                format: function ( s ) {
                        s = $.trim( s.toLowerCase() );
                        if ( ts.collationRegex ) {
                                var tsc = ts.collationTable;
                                s = s.replace( ts.collationRegex, function ( match ) {
                                        var r = tsc[match] ? tsc[match] : tsc[match.toUpperCase()];
                                        return r.toLowerCase();
                                } );
                        }
                        return s;
                },
                type: 'text'
        } );

        ts.addParser( {
                id: 'IPAddress',
                is: function ( s ) {
                        return ts.rgx.IPAddress[0].test(s);
                },
                format: function ( s ) {
                        var a = s.split( '.' ),
                                r = '',
                                l = a.length;
                        for ( var i = 0; i < l; i++ ) {
                                var item = a[i];
                                if ( item.length === 1 ) {
                                        r += '00' + item;
                                } else if ( item.length === 2 ) {
                                        r += '0' + item;
                                } else {
                                        r += item;
                                }
                        }
                        return $.tablesorter.formatFloat(r);
                },
                type: 'numeric'
        } );

        ts.addParser( {
                id: 'currency',
                is: function ( s ) {
                        return ts.rgx.currency[0].test(s);
                },
                format: function ( s ) {
                        return $.tablesorter.formatDigit( s.replace( ts.rgx.currency[1], '' ) );
                },
                type: 'numeric'
        } );

        ts.addParser( {
                id: 'url',
                is: function ( s ) {
                        return ts.rgx.url[0].test(s);
                },
                format: function ( s ) {
                        return $.trim( s.replace( ts.rgx.url[1], '' ) );
                },
                type: 'text'
        } );

        ts.addParser( {
                id: 'isoDate',
                is: function ( s ) {
                        return ts.rgx.isoDate[0].test(s);
                },
                format: function ( s ) {
                        return $.tablesorter.formatFloat((s !== '') ? new Date(s.replace(
                        new RegExp( /-/g), '/')).getTime() : '0' );
                },
                type: 'numeric'
        } );

        ts.addParser( {
                id: 'usLongDate',
                is: function ( s ) {
                        return ts.rgx.usLongDate[0].test(s);
                },
                format: function ( s ) {
                        return $.tablesorter.formatFloat( new Date(s).getTime() );
                },
                type: 'numeric'
        } );

        ts.addParser( {
                id: 'date',
                is: function ( s ) {
                        return ( ts.dateRegex[0].test(s) || ts.dateRegex[1].test(s) || ts.dateRegex[2].test(s ));
                },
                format: function ( s ) {
                        var match;
                        s = $.trim( s.toLowerCase() );

                        if ( ( match = s.match( ts.dateRegex[0] ) ) !== null ) {
                                if ( mw.config.get( 'wgDefaultDateFormat' ) === 'mdy' || mw.config.get( 'wgContentLanguage' ) === 'en' ) {
                                        s = [ match[3], match[1], match[2] ];
                                } else if ( mw.config.get( 'wgDefaultDateFormat' ) === 'dmy' ) {
                                        s = [ match[3], match[2], match[1] ];
                                } else {
                                        // If we get here, we don't know which order the dd-dd-dddd
                                        // date is in. So return something not entirely invalid.
                                        return '99999999';
                                }
                        } else if ( ( match = s.match( ts.dateRegex[1] ) ) !== null ) {
                                s = [ match[3], '' + ts.monthNames[match[2]], match[1] ];
                        } else if ( ( match = s.match( ts.dateRegex[2] ) ) !== null ) {
                                s = [ match[3], '' + ts.monthNames[match[1]], match[2] ];
                        } else {
                                // Should never get here
                                return '99999999';
                        }

                        // Pad Month and Day
                        if ( s[1].length === 1 ) {
                                s[1] = '0' + s[1];
                        }
                        if ( s[2].length === 1 ) {
                                s[2] = '0' + s[2];
                        }

                        var y;
                        if ( ( y = parseInt( s[0], 10) ) < 100 ) {
                                // Guestimate years without centuries
                                if ( y < 30 ) {
                                        s[0] = 2000 + y;
                                } else {
                                        s[0] = 1900 + y;
                                }
                        }
                        while ( s[0].length < 4 ) {
                                s[0] = '0' + s[0];
                        }
                        return parseInt( s.join( '' ), 10 );
                },
                type: 'numeric'
        } );

        ts.addParser( {
                id: 'time',
                is: function ( s ) {
                        return ts.rgx.time[0].test(s);
                },
                format: function ( s ) {
                        return $.tablesorter.formatFloat( new Date( '2000/01/01 ' + s ).getTime() );
                },
                type: 'numeric'
        } );

        ts.addParser( {
                id: 'number',
                is: function ( s ) {
                        return $.tablesorter.numberRegex.test( $.trim( s ));
                },
                format: function ( s ) {
                        return $.tablesorter.formatDigit(s);
                },
                type: 'numeric'
        } );

}( jQuery, mediaWiki ) );