nested mixin filters ex. ::-webkit-input-placeholder

lesscpy/lessc/parser.py

@@ -290,6 +290,7 @@ class LessParser(object):
                           | css_id
                           | css_class
                           | dom_filter
+                          | filter_group
                           | css_color
                           | less_combine
                           | '*'
@@ -479,6 +480,7 @@ class LessParser(object):
         """
         p[0] = [p[1], p[2]]
         
+        
     def p_filter_group_aux(self, p):
         """ filter_group  : filter filter
         """
@@ -493,8 +495,10 @@ class LessParser(object):
     def p_filter(self, p):
         """ filter    : css_filter
                       | ':' css_ident
+                      | ':' css_vendor_property
                       | ':' css_filter
                       | ':' ':' css_ident
+                      | ':' ':' css_vendor_property
         """
         p[0] = list(p)[1:]
         

lesscpy/test/css/mixins-nested-basic.css

@@ -22,3 +22,9 @@
 .content-em .column.blue .deep {
 	padding: 200px;
 }
+.div :-moz-placeholder {
+	color: #ffffff;
+}
+.div::-webkit-input-placeholder {
+	color: #ffffff;
+}

lesscpy/test/css/mixins-nested-basic.min.css

@@ -5,4 +5,6 @@
 .content-em{width:200px;}
 .content-em .column{margin:200px;}
 .content-em .column.blue{color:blue;}
-.content-em .column.blue .deep{padding:200px;}
+.content-em .column.blue .deep{padding:200px;}
+.div :-moz-placeholder{color:#ffffff;}
+.div::-webkit-input-placeholder{color:#ffffff;}

lesscpy/test/less/mixins-nested-basic.less

@@ -15,4 +15,19 @@
 } 
 .content-em {
     .nested-ruleset();
+}
+//
+// filter mixins
+//
+.placeholder(@color: #000) {
+  :-moz-placeholder {
+    color: @color;
+  }
+  &::-webkit-input-placeholder {
+    color: @color;
+  }
+}
+
+.div {
+	.placeholder(#fff);
 }

lesscpy/test/less/mixins.less

@@ -70,3 +70,4 @@
 .foo .bar {
   .bar;
 }
+