(function (tree) {

tree.Quoted = function (str, content, escaped, i) {

this.escaped = escaped;
this.value = content || '';
this.quote = str.charAt(0);
this.index = i;

}; tree.Quoted.prototype = {

toCSS: function () {
    if (this.escaped) {
        return this.value;
    } else {
        return this.quote + this.value + this.quote;
    }
},
eval: function (env) {
    var that = this;
    var value = this.value.replace(/`([^`]+)`/g, function (_, exp) {
        return new(tree.JavaScript)(exp, that.index, true).eval(env).value;
    }).replace(/@\{([\w-]+)\}/g, function (_, name) {
        var v = new(tree.Variable)('@' + name, that.index).eval(env);
        return ('value' in v) ? v.value : v.toCSS();
    });
    return new(tree.Quoted)(this.quote + value + this.quote, value, this.escaped, this.index);
}

};

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