refactor: move ResultElement.logStats() to cLog.messagesStats()

refs #315

src/util/log.ts

-import { Message, MessageCode } from "./message";
+import { Message, MessageCode, MessageSeverity } from "./message";
 import { Result } from "./result";
 
 // tslint:disable-next-line:class-name
@@ -82,4 +82,28 @@ export class cLog {
         }
         return false;
     }
+
+    /**
+     * compute error, warning, info count in a message list
+     */
+    public static messagesStats(messages: Message[], stats?: any): any {
+        if (stats === undefined) {
+            stats = { info: 0, warning: 0, error: 0 };
+        }
+        for (const m of messages) {
+            const s = m.getSeverity();
+            switch (s) {
+                case MessageSeverity.INFO:
+                    stats.info++;
+                    break;
+                case MessageSeverity.WARNING:
+                    stats.warning++;
+                    break;
+                case MessageSeverity.ERROR:
+                    stats.error++;
+                    break;
+            }
+        }
+        return stats;
+    }
 }

src/util/resultelement.ts

@@ -235,26 +235,9 @@ export class ResultElement {
     }
 
     /**
-     * compute error, waning, info count on all log messages
+     * compute error, warning, info count on all log messages
      */
     public logStats(stats?: any): any {
-        if (stats === undefined) {
-            stats = { info: 0, warning: 0, error: 0 };
-        }
-        for (const m of this.log.messages) {
-            const s = m.getSeverity();
-            switch (s) {
-                case MessageSeverity.INFO:
-                    stats.info++;
-                    break;
-                case MessageSeverity.WARNING:
-                    stats.warning++;
-                    break;
-                case MessageSeverity.ERROR:
-                    stats.error++;
-                    break;
-            }
-        }
-        return stats;
+        return cLog.messagesStats(this.log.messages, stats);
     }
 }