actionscript 3 math. expression parser

fast, easy and free

usage:

import ndef.parser.*;
var parser:Parser=new Parser(["x", "y", "z"]);
var expression:String="2*PI*sin(x)*(y+z)^2";
var parsedexpression:Array=parser.parse(expression);
if (parser.success) {
	parsedexpression=parser.simplify(parsedexpression); //optional
	var result1:Number=parser.eval(parsedexpression, [1,2,3]);
	var result2:Number=parser.eval(parsedexpression, [3,2,1]);
	...
}
else{
	trace(parser.errormsg);
}

download source

mparser.zip (demo included)

info

operators: + * - / % ^

functions:
sin(a) cos(a) tan(a) asin(a) acos(a) atan(a) sqrt(a) log(a) abs(a) ceil(a) floor(a) round(a) random(a) fac(a) min(a,b) max(a,b) pyt(a,b)

constants: E PI

comment: /* ... */

variable names:
alphanumeric, first character alphabetic.

the simplify()-method is useful when an expression is evaluated multiple times.
in the above example, 2*PI would be simplified (6.28..) making evaluation faster!


 

            __ __
 a^2+b^2_  |__|__\__
|__|__|__|-|__|__|__|
 (O)  (O)   (O)  (O)