(function (tree) {

tree.URL = function (val, currentFileInfo, isEvald) {

this.value = val;
this.currentFileInfo = currentFileInfo;
this.isEvald = isEvald;

}; tree.URL.prototype = {

type: "Url",
accept: function (visitor) {
    this.value = visitor.visit(this.value);
},
genCSS: function (env, output) {
    output.add("url(");
    this.value.genCSS(env, output);
    output.add(")");
},
toCSS: tree.toCSS,
eval: function (ctx) {
    var val = this.value.eval(ctx),
        rootpath;

    if (!this.isEvald) {
        // Add the base path if the URL is relative
        rootpath = this.currentFileInfo && this.currentFileInfo.rootpath;
        if (rootpath && typeof val.value === "string" && ctx.isPathRelative(val.value)) {
            if (!val.quote) {
                rootpath = rootpath.replace(/[\(\)'"\s]/g, function(match) { return "\\"+match; });
            }
            val.value = rootpath + val.value;
        }

        val.value = ctx.normalizePath(val.value);

        // Add url args if enabled
        if (ctx.urlArgs) {
            if (!val.value.match(/^\s*data:/)) {
                var delimiter = val.value.indexOf('?') === -1 ? '?' : '&';
                var urlArgs = delimiter + ctx.urlArgs;
                if (val.value.indexOf('#') !== -1) {
                    val.value = val.value.replace('#', urlArgs + '#');
                } else {
                    val.value += urlArgs;
                }
            }
        }
    }

    return new(tree.URL)(val, this.currentFileInfo, true);
}

};

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