61 lines
1.2 KiB
Elm
61 lines
1.2 KiB
Elm
module Internal.Tools.Hashdict exposing (..)
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{-| This module abstracts the `Dict` type with one function that chooses the unique identifier for each type.
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For example, this is used to store events by their event id, or store rooms by their room id.
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-}
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import Dict exposing (Dict)
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type Hashdict a
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= Hashdict
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{ hash : a -> String
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, values : Dict String a
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}
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empty : (a -> String) -> Hashdict a
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empty hash =
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Hashdict { hash = hash, values = Dict.empty }
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fromList : (a -> String) -> List a -> Hashdict a
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fromList hash xs =
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Hashdict
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{ hash = hash
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, values =
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xs
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|> List.map (\x -> ( hash x, x ))
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|> Dict.fromList
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}
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get : String -> Hashdict a -> Maybe a
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get k (Hashdict h) =
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Dict.get k h.values
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insert : a -> Hashdict a -> Hashdict a
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insert v (Hashdict h) =
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Hashdict { h | values = Dict.insert (h.hash v) v h.values }
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keys : Hashdict a -> List String
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keys (Hashdict h) =
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Dict.keys h.values
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union : Hashdict a -> Hashdict a -> Hashdict a
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union (Hashdict h1) (Hashdict h2) =
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Hashdict
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{ hash = h1.hash
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, values = Dict.union h1.values h2.values
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}
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values : Hashdict a -> List a
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values (Hashdict h) =
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Dict.values h.values
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