url() parsing

lib/less/adapters/server.js

@@ -8,7 +8,8 @@ process.mixin(less, require('less/parser'));
 
 ['color',    'directive', 'operation',  'dimension',
  'keyword',  'variable',  'ruleset',    'element',
- 'selector', 'quoted',    'expression', 'rule', 'call'
+ 'selector', 'quoted',    'expression', 'rule',
+ 'call',     'url'
 ].forEach(function (n) {
     process.mixin(less.parser, require(path.join('less', 'node', n)));
 });

lib/less/node/url.js

@@ -0,0 +1,9 @@
+
+node.URL = function URL(val) {
+    this.value = val;
+};
+node.URL.prototype = {
+    toCSS: function () {
+        return "url(" + this.value.toCSS ? this.value.toCSS() : this.value + ")";
+    }
+};

lib/less/parser.js

@@ -206,6 +206,13 @@ less.parser = {
                        $(this.entities.string);
             },
             url: function url() {
+                var value;
+
+                if (! $(/url\(/g)) return;
+                value = $(this.entities.string) || $(/[-a-zA-Z0-9_%@$\/.&=:;#+?]+/g);
+                if (! $(')')) throw new(Error)("missing closing ) for url()");
+
+                return new(node.URL)(value);
             },
             font: function font() {
             },