less.js/lib/less/tree/negative.js

var Node = require("./node"),
    Operation = require("./operation"),
    Dimension = require("./dimension");

var Negative = function (node) {
    this.value = node;
};
Negative.prototype = new Node();
Negative.prototype.type = "Negative";
Negative.prototype.genCSS = function (context, output) {
    output.add('-');
    this.value.genCSS(context, output);
};
Negative.prototype.eval = function (context) {
    if (context.isMathOn()) {
        return (new Operation('*', [new Dimension(-1), this.value])).eval(context);
    }
    return new Negative(this.value.eval(context));
};
module.exports = Negative;