(function (tree) {

tree.Keyword = function (value) { this.value = value }; tree.Keyword.prototype = {

eval: function () { return this },
toCSS: function () { return this.value },
compare: function (other) {
    if (other instanceof tree.Keyword) {
        return other.value === this.value ? 0 : 1;
    } else {
        return -1;
    }
}

};

tree.True = new(tree.Keyword)('true'); tree.False = new(tree.Keyword)('false');

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