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1 /*
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2 * Natural Sort algorithm for Javascript - Version 0.7 - Released under MIT license
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3 * Author: Jim Palmer (based on chunking idea from Dave Koelle)
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4 */
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5 /*jshint unused:false */
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6 module.exports = function naturalSort (a, b) {
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7 "use strict";
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8 var re = /(^([+\-]?(?:0|[1-9]\d*)(?:\.\d*)?(?:[eE][+\-]?\d+)?)?$|^0x[0-9a-f]+$|\d+)/gi,
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9 sre = /(^[ ]*|[ ]*$)/g,
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10 dre = /(^([\w ]+,?[\w ]+)?[\w ]+,?[\w ]+\d+:\d+(:\d+)?[\w ]?|^\d{1,4}[\/\-]\d{1,4}[\/\-]\d{1,4}|^\w+, \w+ \d+, \d{4})/,
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11 hre = /^0x[0-9a-f]+$/i,
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12 ore = /^0/,
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13 i = function(s) { return naturalSort.insensitive && ('' + s).toLowerCase() || '' + s; },
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14 // convert all to strings strip whitespace
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15 x = i(a).replace(sre, '') || '',
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16 y = i(b).replace(sre, '') || '',
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17 // chunk/tokenize
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18 xN = x.replace(re, '\0$1\0').replace(/\0$/,'').replace(/^\0/,'').split('\0'),
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19 yN = y.replace(re, '\0$1\0').replace(/\0$/,'').replace(/^\0/,'').split('\0'),
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20 // numeric, hex or date detection
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21 xD = parseInt(x.match(hre), 16) || (xN.length !== 1 && x.match(dre) && Date.parse(x)),
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22 yD = parseInt(y.match(hre), 16) || xD && y.match(dre) && Date.parse(y) || null,
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23 oFxNcL, oFyNcL;
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24 // first try and sort Hex codes or Dates
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25 if (yD) {
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26 if ( xD < yD ) { return -1; }
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27 else if ( xD > yD ) { return 1; }
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28 }
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29 // natural sorting through split numeric strings and default strings
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30 for(var cLoc=0, numS=Math.max(xN.length, yN.length); cLoc < numS; cLoc++) {
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31 // find floats not starting with '0', string or 0 if not defined (Clint Priest)
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32 oFxNcL = !(xN[cLoc] || '').match(ore) && parseFloat(xN[cLoc]) || xN[cLoc] || 0;
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33 oFyNcL = !(yN[cLoc] || '').match(ore) && parseFloat(yN[cLoc]) || yN[cLoc] || 0;
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34 // handle numeric vs string comparison - number < string - (Kyle Adams)
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35 if (isNaN(oFxNcL) !== isNaN(oFyNcL)) { return (isNaN(oFxNcL)) ? 1 : -1; }
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36 // rely on string comparison if different types - i.e. '02' < 2 != '02' < '2'
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37 else if (typeof oFxNcL !== typeof oFyNcL) {
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38 oFxNcL += '';
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39 oFyNcL += '';
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40 }
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41 if (oFxNcL < oFyNcL) { return -1; }
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42 if (oFxNcL > oFyNcL) { return 1; }
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43 }
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44 return 0;
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45 };
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