Adding rules-max rule

src/rules/rules-max.js

@@ -0,0 +1,29 @@
+/*
+ * Rule: Warn when there are 500 or more rules in a stylesheet
+ */
+
+CSSLint.addRule({
+
+    // rule information
+    id: "rules-max",
+    name: "Warn when 500+ rules are present",
+    desc: "Will warn when the rule count in a stylesheet crosses the 500 threshold.",
+    browsers: "IE",
+
+    // initialization
+    init: function(parser, reporter) {
+        "use strict";
+        var rule = this, ruleCount = 0, MAX_RULES = 499;
+
+        parser.addListener("startrule", function() {
+            ruleCount += 1;
+        });
+
+        parser.addListener("endstylesheet", function() {
+            if (ruleCount > MAX_RULES) {
+                reporter.report("There are too many rules (" + ruleCount + ") in the stylesheet.", 0, 0, rule);
+            }
+        });
+    }
+
+});

tests/rules/rules-max.js

@@ -0,0 +1,52 @@
+(function() {
+    "use strict";
+
+    var Assert = YUITest.Assert, MAX_RULES = 499;
+
+    YUITest.TestRunner.add(new YUITest.TestCase({
+
+        name: "rules-max errors",
+
+        /**
+         * generate a 500 rule stylesheet
+         */
+        setUp: function() {
+            var ndx;
+
+            this.count = 0;
+            this.cssA = "";
+            this.cssB = "";
+
+            function num(n) {
+                return ("000" + n).substr(-3);
+            }
+
+            for (ndx = 1; ndx < MAX_RULES; ndx += 1) {
+                this.cssA += ".rule-a-" + num(ndx) + " { display: inline-block; }";
+                this.count += 1;
+            }
+
+            this.cssB = this.cssA;
+            for (ndx = 1; ndx < MAX_RULES; ndx += 1) {
+                this.cssB += ".rule-b-" + num(ndx) + " { display: block; }";
+                this.count += 1;
+            }
+        },
+
+        "Using 499 or fewer rules should not result in a warning": function() {
+            var result = CSSLint.verify(this.cssA, { "rules-max": 1 });
+
+            Assert.areEqual(0, result.messages.length);
+        },
+
+        "Using 500 or more rules should result in a warning": function() {
+            var result = CSSLint.verify(this.cssB, { "rules-max": 1 });
+
+            Assert.areEqual(1, result.messages.length);
+            Assert.areEqual("warning", result.messages[0].type);
+            Assert.areEqual("There are too many rules (" + this.count + ") in the stylesheet.", result.messages[0].message);
+        }
+
+    }));
+
+})();