if (typeof(window) === 'undefined') { var tree = require(require('path').join(__dirname, '..', '..', 'less', 'tree')); } tree.Call = function Call(name, args) { this.name = name; this.args = args; }; tree.Call.prototype = { toCSS: function (context, env) { var args = this.args.map(function (a) { return a.eval() }); return tree.functions[this.name].apply(tree.functions, args).toCSS(); } };