refactor: use switch case instead of convoluded function

Signed-off-by: Naseem <naseem@transit.app>

packages/opentelemetry-core/src/utils/environment.ts

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-import { LogLevel, LogLevelString } from '../common/types';
+import { LogLevel } from '../common/types';
 
 export type ENVIRONMENT_MAP = { [key: string]: string | number };
 
@@ -65,24 +65,37 @@ function parseNumber(
 }
 
 /**
- * Parses a LogLevelString as a LogLevel
+ * Environmentally sets log level if valid log level string is provided
  * @param key
  * @param environment
  * @param values
  */
-function parseLogLevel(
+function setLogLevelFromEnv(
   key: keyof ENVIRONMENT,
   environment: ENVIRONMENT_MAP | ENVIRONMENT,
   values: ENVIRONMENT_MAP
 ) {
   const value = values[key];
-  const logLevelStrings = Object.keys(LogLevel).filter(
-    k => isNaN(Number(k)) === true
-  ) as LogLevelString[];
-  const regex = new RegExp(logLevelStrings.join('|'), 'i');
-  if (value && typeof value === 'string' && regex.test(value)) {
-    const logLevelString = value.toUpperCase() as LogLevelString;
-    environment[key] = LogLevel[logLevelString];
+  switch (typeof value === 'string' ? value.toUpperCase() : value) {
+    case 'DEBUG':
+      environment[key] = LogLevel.DEBUG;
+      break;
+
+    case 'INFO':
+      environment[key] = LogLevel.INFO;
+      break;
+
+    case 'WARN':
+      environment[key] = LogLevel.WARN;
+      break;
+
+    case 'ERROR':
+      environment[key] = LogLevel.ERROR;
+      break;
+
+    default:
+      // do nothing
+      break;
   }
 }
 
@@ -101,7 +114,7 @@ export function parseEnvironment(values: ENVIRONMENT_MAP): ENVIRONMENT {
         break;
 
       case 'OTEL_LOG_LEVEL':
-        parseLogLevel(key, environment, values);
+        setLogLevelFromEnv(key, environment, values);
         break;
 
       default: