(function (tree) {

tree.Value = function (value, separator) {
    this.value = value;
    this.separator = separator ? separator : ",";
};
tree.Value.prototype = {
    type: "Value",
    accept: function (visitor) {
        this.value = visitor.visit(this.value);
    },
    eval: function (env) {
        if (this.value.length === 1) {
            return this.value[0].eval(env);
        } else {
            return new(tree.Value)(this.value.map(function (v) {
                return v.eval(env);
            }));
        }
    },
    toCSS: function (env) {
        return this.value.map(function (e) {
            return e.toCSS(env);
        }).join(this.separator + ((env.compress || this.separator === " ") ? "" : " "));
    }
};

})(require('../tree'));