Making Spry's sort reusable.

SpryModularSortInstructions.js

Spry.Data.DataSet.sortInstructions = {};
Spry.Data.DataSet.sortInstructions['number'] = function( prop ){
	return {
		ascending:function(a, b)
			{
				a = a[prop]; b = b[prop];
				if (a == undefined || b == undefined)
					return (a == b) ? 0 : (a ? 1 : -1);
				return a-b;
			},
		descending:function(a, b)
			{
				a = a[prop]; b = b[prop];
				if (a == undefined || b == undefined)
					return (a == b) ? 0 : (a ? -1 : 1);
				return b-a;
			}
	}
};

Spry.Data.DataSet.sortInstructions['date'] = function( prop ){
	return {
		ascending:function(a, b)
		{
			var dA = a[prop];
			var dB = b[prop];
			dA = dA ? (new Date(dA)) : 0;
			dB = dB ? (new Date(dB)) : 0;
			return dA - dB;
		},
		descending:function(a, b)
		{
			var dA = a[prop];
			var dB = b[prop];
			dA = dA ? (new Date(dA)) : 0;
			dB = dB ? (new Date(dB)) : 0;
			return dB - dA;
		}
	}
};

Spry.Data.DataSet.sortInstructions['default'] = function( prop ){
	return {
		ascending:function(a, b)
		{
			a = a[prop];
			b = b[prop];
			if (a == undefined || b == undefined)
				return (a == b) ? 0 : (a ? 1 : -1);
			var tA = a.toString();
			var tB = b.toString();
			var tA_l = tA.toLowerCase();
			var tB_l = tB.toLowerCase();
			var min_len = tA.length > tB.length ? tB.length : tA.length;

			for (var i=0; i < min_len; i++)
			{
				var a_l_c = tA_l.charAt(i);
				var b_l_c = tB_l.charAt(i);
				var a_c = tA.charAt(i);
				var b_c = tB.charAt(i);
				if (a_l_c > b_l_c)
					return 1;
				else if (a_l_c < b_l_c)
					return -1;
				else if (a_c > b_c)
					return 1;
				else if (a_c < b_c)
					return -1;
			}
			if(tA.length == tB.length)
				return 0;
			else if (tA.length > tB.length)
				return 1;
			return -1;
		},
		descending:function(a, b)
		{
			a = a[prop];
			b = b[prop];
			if (a == undefined || b == undefined)
				return (a == b) ? 0 : (a ? -1 : 1);
			var tA = a.toString();
			var tB = b.toString();
			var tA_l = tA.toLowerCase();
			var tB_l = tB.toLowerCase();
			var min_len = tA.length > tB.length ? tB.length : tA.length;
			for (var i=0; i < min_len; i++)
			{
				var a_l_c = tA_l.charAt(i);
				var b_l_c = tB_l.charAt(i);
				var a_c = tA.charAt(i);
				var b_c = tB.charAt(i);
				if (a_l_c > b_l_c)
					return -1;
				else if (a_l_c < b_l_c)
					return 1;
				else if (a_c > b_c)
					return -1;
				else if (a_c < b_c)
					return 1;
			}
			if(tA.length == tB.length)
				return 0;
			else if (tA.length > tB.length)
				return -1;
			return 1;
		}
	}
};

Spry.Data.DataSet.prototype.sort.getSortFunc = function(prop, type, order)
{
	var instruction = Spry.Data.DataSet.sortInstructions[ /[html|string]/.test(type) ? "default" : type ];
	
	if( !instruction ) 
		instruction = Spry.Data.DataSet.sortInstructions.default;
		
	return instruction( prop )[ order ];
};