Add CSS colors count and a palette as offender

lib/metadata/policies.js

@@ -410,6 +410,52 @@ var policies = {
             };
         }
     },
+    "cssColors": {
+        "tool": "phantomas",
+        "label": "Different colors",
+        "message": "<p>This is the number of different colors defined in CSS.</p><p>Your CSS project will be easier to maintain if you keep a small color set.</p>",
+        "isOkThreshold": 30,
+        "isBadThreshold": 150,
+        "isAbnormalThreshold": 300,
+        "hasOffenders": true,
+        "offendersTransformFn": function(offenders, ruleObject) {
+            var deduplicatedObj = {};
+
+            offenders.map(function(offender) {
+                var parts = /^([^ ]*) \((\d+) times\)$/.exec(offender);
+
+                if (!parts) {
+                    debug('cssColors offenders transform function error with "%s"', offender);
+                    return;
+                }
+
+                var color = parts[1];
+                var count = parseInt(parts[2], 10);
+
+                deduplicatedObj[color] = (deduplicatedObj[color] || 0) + count;
+            });
+
+            var deduplicatedTable = [];
+            for (var color in deduplicatedObj) {
+                deduplicatedTable.push({
+                    color: color,
+                    occurrences: deduplicatedObj[color]
+                });
+            }
+
+            deduplicatedTable.sort(function(a, b) {
+                return b.occurrences - a.occurrences;
+            });
+
+            // Override rules.value
+            ruleObject.value = deduplicatedTable.length;
+
+            return {
+                count: deduplicatedTable.length,
+                palette: deduplicatedTable
+            };
+        }
+    },
     "cssImports": {
         "tool": "phantomas",
         "label": "Uses of @import",

lib/metadata/scoreProfileGeneric.json

@@ -46,7 +46,8 @@
             "policies": {
                 "cssRules": 2,
                 "cssComplexSelectors": 2,
-                "cssComplexSelectorsByAttribute": 1.5
+                "cssComplexSelectorsByAttribute": 1.5,
+                "cssColors": 0.5
             }
         },
         "badCSS": {

lib/rulesChecker.js

@@ -65,7 +65,7 @@ var RulesChecker = function() {
                         if (policy.offendersTransformFn) {
 
                             try {
-                                offendersObj = policy.offendersTransformFn(offenders);
+                                offendersObj = policy.offendersTransformFn(offenders, rule);
                             } catch(err) {
                                 debug('Error while transforming offenders for %s', metricName);
                                 debug(err);