+-spec find_unique_presence_violations(t(K, _V), [K]) ->
+ presence_violations(K).
+find_unique_presence_violations(T, KeysRequired) ->
+ KeysOptional = [],
+ find_unique_presence_violations(T, KeysRequired, KeysOptional).
+
+-spec find_unique_presence_violations(t(K, _V), [K], [K]) ->
+ presence_violations(K).
+find_unique_presence_violations(T, KeysRequired, KeysOptional) ->
+ KeysSupported = KeysRequired ++ KeysOptional,
+ KeysGiven = [K || {K, _V} <- T],
+ KeysGivenUnique = lists:usort(KeysGiven),
+ KeysDuplicated = lists:usort(KeysGiven -- KeysGivenUnique),
+ KeysMissing = KeysRequired -- KeysGivenUnique,
+ KeysUnsupported = KeysGivenUnique -- KeysSupported,
+ #hope_kv_list_presence_violations
+ { keys_missing = KeysMissing
+ , keys_duplicated = KeysDuplicated
+ , keys_unsupported = KeysUnsupported
+ }.
+