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50 lines
1.3 KiB
Elm
50 lines
1.3 KiB
Elm
module MultiDict exposing (MultiDict, empty, get, insert, keys, remove, set)
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import Dict exposing (Dict)
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import List.Extra
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import List.Nonempty as NonEmpty
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type alias NonEmpty a =
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NonEmpty.Nonempty a
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type MultiDict k v
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= MultiDict (Dict k (NonEmpty v))
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empty : MultiDict k v
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empty =
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MultiDict Dict.empty
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insert : comparable -> v -> MultiDict comparable v -> MultiDict comparable v
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insert key value (MultiDict dict) =
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MultiDict
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(Dict.update key (Maybe.map (NonEmpty.cons value) >> Maybe.withDefault (NonEmpty.fromElement value) >> Just) dict)
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get : comparable -> MultiDict comparable v -> List v
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get key (MultiDict dict) =
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Dict.get key dict
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|> Maybe.map NonEmpty.toList
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|> Maybe.withDefault []
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keys : MultiDict k v -> List k
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keys (MultiDict dict) =
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Dict.toList dict
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|> List.concatMap (\( k, vs ) -> List.repeat (NonEmpty.length vs) k)
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remove : comparable -> v -> MultiDict comparable v -> MultiDict comparable v
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remove key value (MultiDict dict) =
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MultiDict
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(Dict.update key (Maybe.andThen (NonEmpty.toList >> List.Extra.remove value >> NonEmpty.fromList)) dict)
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set : comparable -> List v -> MultiDict comparable v -> MultiDict comparable v
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set key values (MultiDict dict) =
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MultiDict
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(Dict.update key (\_ -> NonEmpty.fromList values) dict)
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