Rules and test for the IE max selector count warning. There are two rules one that checks for crossing 3800 rules and one that checks for crossing the 4095 limit.

Author: beckje01

src/rules/selector-max.js

@@ -0,0 +1,57 @@
+/*
+ * Rule: Warn people with approaching the IE 4095 limit 
+ */
+/*global CSSLint*/
+CSSLint.addRule({
+
+    //rule information
+    id: "selector-max-approaching",
+    name: "Warn when approaching the 4095 limit for IE",
+    desc: "Will warn when selector count is >= 3800 rules.",
+    browsers: "All",
+
+    //initialization
+    init: function(parser, reporter){
+		var rule = this,
+			count = 0,
+			notFired = true;
+
+		parser.addListener('startrule',function(event){
+			count++;
+			if(count >= 3800 && notFired){
+				notFired=false;
+				var selectors = event.selectors;
+				reporter.report("Rule is the number 3800 and approaching the 4095 IE limit.", selectors[0].line, selectors[0].col, rule);
+			}
+		});
+	}
+
+});
+
+
+
+CSSLint.addRule({
+
+    //rule information
+    id: "selector-max",
+    name: "Error when past the 4095 limit for IE",
+    desc: "Will error when selector count is > 4095.",
+    browsers: "All",
+
+    //initialization
+    init: function(parser, reporter){
+		var rule = this,
+			count = 0,
+			notFired = true;
+
+		parser.addListener('startrule',function(event){
+			count++;
+			if(count >= 4096 && notFired){
+				notFired=false;
+				var selectors = event.selectors;
+				reporter.report("Rule is the number 4096 and past the 4095 IE limit.", selectors[0].line, selectors[0].col, rule);
+			}
+		});
+	}
+
+});