/*************************************************************************
* This macro works as a calculator. It uses eval() method to evaluate selected
* text as an expression. The result is displayed and copied to the clipboard.
* Functions: pow(), sqrt(), exp(), log(), abs(),
*            sin(), cos(), tan(), asin(), acos(), atan(), atan2(),
*            ceil(), floor(), round(), random(), min(), max()
* Constants: PI, E, LN2, LN10, LOG2E, LOG10E, SQRT1_2, SQRT2
* See JScript or JavaScript reference (Math object) for details.
* Examples of expressions:
*               (4*3.1-3.4)/1.5+6
*               7 % sqrt( pow (5,2) - 9*sin(PI/2) )
*               0xff * 1e-3
*               111111111*111111111==12345678987654321
*               a=1; b=3; a/b
*
*originally posted 6/16/2004 at http://www.emeditor.com/forum/viewtopic.php?t=161
**************************************************************************/

str = document.selection.Text;
if (str=="") {
	alert("selection is empty");
	Quit();
}

// optionally massage text before evaluation
//str=str.replace( /,/g, "");
//str=str.replace( /\bln\s*\(/g, "log(" );
//str=str.replace( /\blg\s*\(/g, "1/LN10*log(" );

with (Math)
	result = eval(str);
alert(result);
clipboardData.clearData();
clipboardData.setData( "Text", result );

// custom functions can be added:
//function fact(n) {
//	x=1; n=Math.round(n);
//	for (i=n; i>1; --i)
//		x=x*i;
//	return x;
//}