Add support for unicode descriptors. Fixes #1107

lib/less/index.js

@@ -89,7 +89,7 @@ var less = {
  'call',       'url',        'alpha',      'import',
  'mixin',      'comment',    'anonymous',  'value',
  'javascript', 'assignment', 'condition',  'paren',
- 'media', 'ratio'
+ 'media',      'ratio',      'unicode-descriptor'
 ].forEach(function (n) {
     require('./tree/' + n);
 });

lib/less/parser.js

@@ -631,7 +631,8 @@ less.Parser = function Parser(env) {
                     return $(this.entities.ratio) ||
                            $(this.entities.dimension) ||
                            $(this.entities.color) ||
-                           $(this.entities.quoted);
+                           $(this.entities.quoted) ||
+                           $(this.entities.unicodeDescriptor);
                 },
 
                 // Assignments are argument entities for calls.
@@ -734,6 +735,19 @@ less.Parser = function Parser(env) {
                     return new(tree.Ratio)(value[1]);
                   }
                 },
+                
+                //
+                // A unicode descriptor, as is used in unicode-range
+                //
+                // U+0??  or U+00A1-00A9
+                //
+                unicodeDescriptor: function () {
+                    var ud;
+                    
+                    if (ud = $(/^U\+[0-9a-fA-F?]+(\-[0-9a-fA-F?]+)?/)) {
+                        return new(tree.UnicodeDescriptor)(ud[0]);
+                    }
+                },
 
                 //
                 // JavaScript code to be evaluated
@@ -962,7 +976,7 @@ less.Parser = function Parser(env) {
             //
             entity: function () {
                 return $(this.entities.literal) || $(this.entities.variable) || $(this.entities.url) ||
-                       $(this.entities.call)    || $(this.entities.keyword)  || $(this.entities.javascript) ||
+                       $(this.entities.call)    || $(this.entities.keyword)  ||$(this.entities.javascript) ||
                        $(this.comment);
             },
 
@@ -1073,9 +1087,6 @@ less.Parser = function Parser(env) {
 
                 if (elements.length > 0) { return new(tree.Selector)(elements) }
             },
-            tag: function () {
-                return $(/^[A-Za-z][A-Za-z-]*[0-9]?/) || $('*');
-            },
             attribute: function () {
                 var attr = '', key, val, op;
 

lib/less/tree/unicode-descriptor.js

@@ -0,0 +1,13 @@
+(function (tree) {
+
+tree.UnicodeDescriptor = function (value) {
+    this.value = value;
+};
+tree.UnicodeDescriptor.prototype = {
+    toCSS: function (env) {
+        return this.value;
+    },
+    eval: function () { return this }
+};
+
+})(require('../tree'));

test/css/css-3.css

@@ -6,6 +6,7 @@
 @font-face {
   font-family: Headline;
   src: local(Futura-Medium), url(fonts.svg#MyGeometricModern) format("svg");
+  unicode-range: U+??????, U+0???, U+0-7F, U+A5;
 }
 .other {
   -moz-transform: translate(0, 11em) rotate(-90deg);

test/less/css-3.less

@@ -8,6 +8,7 @@
   font-family: Headline;
   src: local(Futura-Medium),
        url(fonts.svg#MyGeometricModern) format("svg");
+  unicode-range: U+??????, U+0???, U+0-7F, U+A5;
 }
 .other {
   -moz-transform: translate(0, 11em) rotate(-90deg);