3 files changed, 38 insertions, 18 deletions
diff --git a/internal/cvss/badkey.go b/internal/cvss/badkey.go
new file mode 100644
index 0000000..872a6d2
--- /dev/null
+++ b/internal/cvss/badkey.go
@@ -0,0 +1,20 @@
+// CVSS vector parser.
+package cvss
+
+import "fmt"
+
+// Bad metric key error.
+type badKey struct {
+  version Version
+  key string
+}
+
+// Create new bad key error.
+func newBadKey(version Version, key string) error {
+  return &badKey { version, key }
+}
+
+// Return printable error string
+func (e badKey) Error() string {
+  return fmt.Sprintf("invalid CVSS %s metric key: %s", e.version, e.key)
+}
diff --git a/internal/cvss/cvss.go b/internal/cvss/cvss.go
index 8fc6314..057a163 100644
--- a/internal/cvss/cvss.go
+++ b/internal/cvss/cvss.go
@@ -388,15 +388,15 @@ var v3KeyIds = map[string]v3Key {
   "MA": v3ModifiedAvailability,
 }
 
-// Get metric key from string.
-func getV3KeyFromString(s string) (v3Key, error) {
-  k, ok := v3KeyIds[s]
-  if ok {
-    return k, nil
-  } else {
-    return v3InvalidKey, fmt.Errorf("invalid metric key: %s", s)
-  }
-}
+// // Get metric key from string.
+// func getV3KeyFromString(s string) (v3Key, error) {
+//   k, ok := v3KeyIds[s]
+//   if ok {
+//     return k, nil
+//   } else {
+//     return v3InvalidKey, newBadKey(V30, s)
+//   }
+// }
 
 // Get metric key name.
 func (k v3Key) Name() string {
diff --git a/internal/cvss/v2key.go b/internal/cvss/v2key.go
index ae976be..8a7996c 100644
--- a/internal/cvss/v2key.go
+++ b/internal/cvss/v2key.go
@@ -64,15 +64,15 @@ var v2KeyIds = map[string]v2Key {
   "AR": v2AvailabilityRequirement,
 }
 
-// Get metric key from string.
-func getV2KeyFromString(s string) (v2Key, error) {
-  k, ok := v2KeyIds[s]
-  if ok {
-    return k, nil
-  } else {
-    return v2InvalidKey, fmt.Errorf("invalid metric key: %s", s)
-  }
-}
+// // Get metric key from string.
+// func getV2KeyFromString(s string) (v2Key, error) {
+//   k, ok := v2KeyIds[s]
+//   if ok {
+//     return k, nil
+//   } else {
+//     return v2InvalidKey, newBadKey(V20, s)
+//   }
+// }
 
 // Get metric key name.
 func (k v2Key) Name() string {