(function (tree) {

tree.Directive = function (name, value, features) {

this.name = name;

if (Array.isArray(value)) {
    this.ruleset = new(tree.Ruleset)([], value);
    this.ruleset.allowImports = true;
} else {
    this.value = value;
}

}; tree.Directive.prototype = {

toCSS: function (ctx, env) {
    if (this.ruleset) {
        this.ruleset.root = true;
        return this.name + (env.compress ? '{' : ' {\n  ') +
               this.ruleset.toCSS(ctx, env).trim().replace(/\n/g, '\n  ') +
                           (env.compress ? '}': '\n}\n');
    } else {
        return this.name + ' ' + this.value.toCSS() + ';\n';
    }
},
eval: function (env) {
    env.frames.unshift(this);
    this.ruleset = this.ruleset && this.ruleset.eval(env);
    env.frames.shift();
    return this;
},
variable: function (name) { return tree.Ruleset.prototype.variable.call(this.ruleset, name) },
find: function () { return tree.Ruleset.prototype.find.apply(this.ruleset, arguments) },
rulesets: function () { return tree.Ruleset.prototype.rulesets.apply(this.ruleset) }

};

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