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Tweak unsafePartial usages by JordanMartinez · Pull Request #57 · purescript/purescript-ordered-collections · GitHub

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Tweak unsafePartial usages #57

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Merged
JordanMartinez merged 1 commit into from
Apr 13, 2022
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Tweak unsafePartial usages #57

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13 changes: 8 additions & 5 deletions src/Data/Map/Internal.purs
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Original file line number Diff line number Diff line change
Expand Up @@ -63,7 +63,7 @@ import Data.Traversable (traverse, class Traversable)
import Data.TraversableWithIndex (class TraversableWithIndex, traverseWithIndex)
import Data.Tuple (Tuple(Tuple), snd, uncurry)
import Data.Unfoldable (class Unfoldable, unfoldr)
import Partial.Unsafe (unsafePartial)
import Partial.Unsafe (unsafeCrashWith)
import Prim.TypeError (class Warn, Text)

-- | `Map k v` represents maps from keys of type `k` to values of type `v`.
Expand Down Expand Up @@ -507,7 +507,7 @@ pop k = down Nil
comp = compare

down :: List (TreeContext k v) -> Map k v -> Maybe (Tuple v (Map k v))
down = unsafePartial \ctx m -> case m of
down ctx m = case m of
Leaf -> Nothing
Two left k1 v1 right ->
case right, comp k k1 of
Expand All @@ -533,7 +533,7 @@ pop k = down Nil
_ , _ , _ -> down (Cons (ThreeRight left k1 v1 mid k2 v2) ctx) right

up :: List (TreeContext k v) -> Map k v -> Map k v
up = unsafePartial \ctxs tree ->
up ctxs tree =
case ctxs of
Nil -> tree
Cons x ctx ->
Expand All @@ -555,22 +555,25 @@ pop k = down Nil
ThreeMiddle (Three a k1 v1 b k2 v2 c) k3 v3 k4 v4 e, d -> fromZipper ctx (Three (Two a k1 v1 b) k2 v2 (Two c k3 v3 d) k4 v4 e)
ThreeMiddle a k1 v1 k2 v2 (Three c k3 v3 d k4 v4 e), b -> fromZipper ctx (Three a k1 v1 (Two b k2 v2 c) k3 v3 (Two d k4 v4 e))
ThreeRight a k1 v1 (Three b k2 v2 c k3 v3 d) k4 v4, e -> fromZipper ctx (Three a k1 v1 (Two b k2 v2 c) k3 v3 (Two d k4 v4 e))
_, _ -> unsafeCrashWith "The impossible happened in partial function `up`."

maxNode :: Map k v -> { key :: k, value :: v }
maxNode = unsafePartial \m -> case m of
maxNode m = case m of
Two _ k' v Leaf -> { key: k', value: v }
Two _ _ _ right -> maxNode right
Three _ _ _ _ k' v Leaf -> { key: k', value: v }
Three _ _ _ _ _ _ right -> maxNode right
_ -> unsafeCrashWith "The impossible happened in partial function `maxNode`."


removeMaxNode :: List (TreeContext k v) -> Map k v -> Map k v
removeMaxNode = unsafePartial \ctx m ->
removeMaxNode ctx m =
case m of
Two Leaf _ _ Leaf -> up ctx Leaf
Two left k' v right -> removeMaxNode (Cons (TwoRight left k' v) ctx) right
Three Leaf k1 v1 Leaf _ _ Leaf -> up (Cons (TwoRight Leaf k1 v1) ctx) Leaf
Three left k1 v1 mid k2 v2 right -> removeMaxNode (Cons (ThreeRight left k1 v1 mid k2 v2) ctx) right
_ -> unsafeCrashWith "The impossible happened in partial function `removeMaxNode`."


-- | Insert the value, delete a value, or update a value for a key in a map
Expand Down
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