dojo.provide("dojox.dtl.filter.logic");

dojo.mixin(dojox.dtl.filter.logic, {
	default_: function(value, arg){
		// summary: If value is unavailable, use given default
		return value || arg || "";
	},
	default_if_none: function(value, arg){
		// summary: If value is null, use given default
		return (value === null) ? arg || "" : value || "";
	},
	divisibleby: function(value, arg){
		// summary: Returns true if the value is devisible by the argument"
		return (parseInt(value) % parseInt(arg)) == 0;
	},
	_yesno: /\s*,\s*/g,
	yesno: function(value, arg){
		// summary:
		//		arg being a comma-delimited string, value of true/false/none
		//		chooses the appropriate item from the string
		if(!arg) arg = 'yes,no,maybe';
		var parts = arg.split(dojox.dtl.filter.logic._yesno);
		if(parts.length < 2){
			return value;
		}
		if(value) return parts[0];
		if((!value && value !== null) || parts.length < 3) return parts[1];
		return parts[2];
	}
});