add normalization for ctv os

normalize/os.go

@@ -1,17 +1,48 @@
 //go:generate ragel -Z -G2 os_fsm.rl
 package normalize
 
-// Os returns either android or ios depending
-// on what can be found in the given string
+// Os returns a normalized OS name (android, ios, tvos, roku, fireos, smartcast, webos, tizen, linux, vidaa, reachtv, or chromeos)
+// based on what can be found in the given string
 func Os(os string) string {
 	if os == "" {
 		return ""
 	}
+	// Check more specific patterns first to avoid false matches
+	if MatchOsFireOS(os) {
+		return "fireos"
+	}
+	if MatchOsSmartCast(os) {
+		return "smartcast"
+	}
+	if MatchOsChromeOS(os) {
+		return "chromeos"
+	}
+	if MatchOsTvOS(os) {
+		return "tvos"
+	}
+	if MatchOsRoku(os) {
+		return "roku"
+	}
+	if MatchOsWebOS(os) {
+		return "webos"
+	}
+	if MatchOsTizen(os) {
+		return "tizen"
+	}
+	if MatchOsVidaa(os) {
+		return "vidaa"
+	}
+	if MatchOsReachTV(os) {
+		return "reachtv"
+	}
 	if MatchOsiOS(os) {
 		return "ios"
 	}
 	if MatchOsAndroid(os) {
 		return "android"
 	}
+	if MatchOsLinux(os) {
+		return "linux"
+	}
 	return ""
 }