(function (tree) {

tree.Rule = function (name, value, important, index, inline) {

this.name = name;
this.value = (value instanceof tree.Value) ? value : new(tree.Value)([value]);
this.important = important ? ' ' + important.trim() : '';
this.index = index;
this.inline = inline || false;

if (name.charAt(0) === '@') {
    this.variable = true;
} else { this.variable = false }

}; tree.Rule.prototype.toCSS = function (env) {

if (this.variable) { return "" }
else {
    return this.name + (env.compress ? ':' : ': ') +
           this.value.toCSS(env) +
           this.important + (this.inline ? "" : ";");
}

};

tree.Rule.prototype.eval = function (context) {

return new(tree.Rule)(this.name,
                      this.value.eval(context),
                      this.important,
                      this.index, this.inline);

};

tree.Shorthand = function (a, b) {

this.a = a;
this.b = b;

};

tree.Shorthand.prototype = {

toCSS: function (env) {
    return this.a.toCSS(env) + "/" + this.b.toCSS(env);
},
eval: function () { return this }

};

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