/**
* Data can often be a complicated mix of numbers and letters (file names
* are a common example) and sorting them in a natural manner is quite a
* difficult problem.
*
* Fortunately a deal of work has already been done in this area by other
* authors - the following plug-in uses the [naturalSort() function by Jim
* Palmer](http://www.overset.com/2008/09/01/javascript-natural-sort-algorithm-with-unicode-support) to provide natural sorting in DataTables.
*
* @name Natural sorting
* @summary Sort data with a mix of numbers and letters _naturally_.
* @author [Jim Palmer](http://www.overset.com/2008/09/01/javascript-natural-sort-algorithm-with-unicode-support)
*
* @example
* $('#example').dataTable( {
* columnDefs: [
* { type: 'natural', targets: 0 }
* ]
* } );
*/
(function() {
/*
* Natural Sort algorithm for Javascript - Version 0.7 - Released under MIT license
* Author: Jim Palmer (based on chunking idea from Dave Koelle)
* Contributors: Mike Grier (mgrier.com), Clint Priest, Kyle Adams, guillermo
* See: http://js-naturalsort.googlecode.com/svn/trunk/naturalSort.js
*/
function naturalSort (a, b) {
var re = /(^-?[0-9]+(\.?[0-9]*)[df]?e?[0-9]?$|^0x[0-9a-f]+$|[0-9]+)/gi,
sre = /(^[ ]*|[ ]*$)/g,
dre = /(^([\w ]+,?[\w ]+)?[\w ]+,?[\w ]+\d+:\d+(:\d+)?[\w ]?|^\d{1,4}[\/\-]\d{1,4}[\/\-]\d{1,4}|^\w+, \w+ \d+, \d{4})/,
hre = /^0x[0-9a-f]+$/i,
ore = /^0/,
// convert all to strings and trim()
x = a.toString().replace(sre, '') || '',
y = b.toString().replace(sre, '') || '',
// chunk/tokenize
xN = x.replace(re, '\0$1\0').replace(/\0$/,'').replace(/^\0/,'').split('\0'),
yN = y.replace(re, '\0$1\0').replace(/\0$/,'').replace(/^\0/,'').split('\0'),
// numeric, hex or date detection
xD = parseInt(x.match(hre), 10) || (xN.length !== 1 && x.match(dre) && Date.parse(x)),
yD = parseInt(y.match(hre), 10) || xD && y.match(dre) && Date.parse(y) || null;
// first try and sort Hex codes or Dates
if (yD) {
if ( xD < yD ) {
return -1;
}
else if ( xD > yD ) {
return 1;
}
}
// natural sorting through split numeric strings and default strings
for(var cLoc=0, numS=Math.max(xN.length, yN.length); cLoc < numS; cLoc++) {
// find floats not starting with '0', string or 0 if not defined (Clint Priest)
var oFxNcL = !(xN[cLoc] || '').match(ore) && parseFloat(xN[cLoc], 10) || xN[cLoc] || 0;
var oFyNcL = !(yN[cLoc] || '').match(ore) && parseFloat(yN[cLoc], 10) || yN[cLoc] || 0;
// handle numeric vs string comparison - number < string - (Kyle Adams)
if (isNaN(oFxNcL) !== isNaN(oFyNcL)) {
return (isNaN(oFxNcL)) ? 1 : -1;
}
// rely on string comparison if different types - i.e. '02' < 2 != '02' < '2'
else if (typeof oFxNcL !== typeof oFyNcL) {
oFxNcL += '';
oFyNcL += '';
}
if (oFxNcL < oFyNcL) {
return -1;
}
if (oFxNcL > oFyNcL) {
return 1;
}
}
return 0;
}
jQuery.extend( jQuery.fn.dataTableExt.oSort, {
"natural-asc": function ( a, b ) {
return naturalSort(a,b);
},
"natural-desc": function ( a, b ) {
return naturalSort(a,b) * -1;
}
} );
}());
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