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//process linking system

//storing functions in js object for easy access
var math = {
	"+":function(first, second) {
		return first + second;
	},
	"-":function(first, second) {
		return first - second;
	},
	"*":function(first, second) {
		return first * second;
	},
	"/":function(first, second) {
		return first / second;
	},
	"%":function(first, second) {
		return first % second;
	}
};

//single functional unit object
var mathprocess = function(operand, oper) {
	this.operand = operand;
	this.oper = oper;
	mathprocess.prototype.apply = function(value) {
		return math[this.oper](value, this.operand);
	};
};

//parses func strings in format START ;+:3; ;*:7; ;-:4; END
// uses /;(.):(.);/.exec(";+:3;") like patterns 
var MathFunc = function(string) {
	var units = string.split(" ");
	this.oplist = [];
	for(var i=0;i<units.length;i++) {
		if (/;([+-/*%]):([0-9]+);/.test(units[i])) {
			var match = /;(.):(.);/.exec(units[i]);
			var process = new mathprocess(parseInt(match[2]), match[1]);
			this.oplist.push(process);
		}
	}
	//aplies the list of processes onto the value.
	MathFunc.prototype.call = function(value) {
		if (typeof value !== 'number') return 0;
		
		for(var i=0;i<this.oplist.length;i++) {
			value = oplist[i].apply(value);
		}
		return value;
	};
};