the e() LESS function

used to escape strings in values.
Added Anonymous node to handle things like this.

index.js

@@ -40,7 +40,7 @@ var less = {
  'keyword',  'variable',  'ruleset',    'element',
  'selector', 'quoted',    'expression', 'rule',
  'call',     'url',       'alpha',      'import',
- 'mixin',    'comment'
+ 'mixin',    'comment', 'anonymous'
 ].forEach(function (n) {
     require(path.join('less', 'tree', n));
 });

lib/less/functions.js

@@ -28,6 +28,9 @@ tree.functions = {
             else if (h * 3 < 2) return m1 + (m2 - m1) * (2/3 - h) * 6;
             else                return m1;
         }
+    },
+    e: function (str) {
+        return new(tree.Anonymous)(str);
     }
 };
 

lib/less/tree/anonymous.js

@@ -0,0 +1,11 @@
+if (typeof(require) !== 'undefined') { var tree = require('less/tree') }
+
+tree.Anonymous = function Anonymous(string) {
+    this.value = string.content;
+};
+tree.Anonymous.prototype = {
+    toCSS: function () {
+        return this.value;
+    },
+    eval: function () { return this }
+};

test/css/functions.css

@@ -4,3 +4,6 @@
   height: undefined("self");
   border-width: 5;
 }
+#built-in {
+  escaped: -Some::weird(#thing, y);
+}

test/less/functions.less

@@ -4,3 +4,7 @@
   height: undefined("self");
   border-width: add(2, 3);
 }
+
+#built-in {
+  escaped: e("-Some::weird(#thing, y)");
+}