.unary {
	// all operators are parsable as unary operators, anything
	// but - throws an error right now though,

	// this gives two numbers
	sub: 10 -5;
	// add: 10 +5; // error
	// div: 10 /5; // error
	// mul: 10 *5; // error
}

.spaces {
	// we can make the parser do math by leaving out the 
	// space after the first value, or putting spaces on both sides

	sub: 10-5;
	sub: 10 - 5;

	add: 10+5; 
	add: 10 + 5; 

	// div: 10/5; // this wont work, read on
	div: 10 / 5; 

	mul: 10*5; 
	mul: 10 * 5; 
}

// these properties have divison not in parenthases
.supress-division {
	border-radius: 10px / 10px;
	border-radius: 10px/10px;
	border-radius: hello (10px/10px) world;
	@x: 10px;
	font: @x/30 sans-serif;
	font: 10px / 20px sans-serif;
	font: 10px/20px sans-serif;
	border-radius:0 15px 15px 15px / 0 50% 50% 50%;
}


.parens {
	// if you are unsure, then just wrap the expression in parentheses and it will
	// always evaluate.

	// notice we no longer have unary operators, and these will evaluate
	sub: (10 -5);
	add: (10 +5);
	div: (10 /5);
	div: (10/5); // no longer interpreted as the shorthand
	mul: (10 *5);
}

.keyword-names {
	// watch out when doing math with keywords, - is a valid keyword character
	@a: 100;
	@b: 25;
	@a-: "hello";
	height: @a-@b; // here we get "hello" 25, not 75
}


.negation {
    hello: -(1px);
    hello: 0-(1px);

	@something: 10;
	hello: -@something;
}


// and now here are the tests

.test {
	single: (5);
	single: 5+(5);
	single: (5)+((5));

	parens: (5 +(5)) -2;
	// parens: ((5 +(5)) -2); // FAILS - fixme

	math: (5 + 5)*(2 / 1);
	math: (5+5)*(2/1);

	width: 2 * (4 * (2 + (1 + 6))) - 1;
	height: ((2+3)*(2+3) / (9-4)) + 1;
	padding: (2px + 4px) 1em 2px 2;

	@var: (2 * 2);
	padding: (2 * @var) 4 4 (@var * 1px);
	width: (@var * @var) * 6;
	height: (7 * 7) + (8 * 8);
	margin: 4 * (5 + 5) / 2 - (@var * 2);
}

.percents {
	color: 100 * 10%;
	color: 10% * 100;
	color: 10% * 10%;

	color: 100px * 10%; // lessjs makes this px
	color: 10% * 100px; // lessjs makes this %

	color: 20% + 10%;
	color: 20% - 10%;

	color: 20% / 10%;
}

.misc {
	x: 10px * 4em;
	y: 10 * 4em;

}