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in fcore/search-list.sml, only call 'insMiddle' function if new value is not in middle

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Humza Shahid
2024-11-24 20:42:17 +00:00
parent eb3eb6c41f
commit c6343cac40
1 changed files with 22 additions and 5 deletions
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27
fcore/search-list.sml
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@@ -63,9 +63,8 @@ struct
new :: right new :: right
| [] => new :: right | [] => new :: right
fun insMiddle (new, hd, tl, left, right) = fun insMiddle (new, middle, hd, tl, left, right) =
let let
val middle = BinSearch.equalOrMore (new, hd)
val leftSlice = VectorSlice.slice (hd, 0, SOME middle) val leftSlice = VectorSlice.slice (hd, 0, SOME middle)
val rightLength = Vector.length hd - middle val rightLength = Vector.length hd - middle
val rightSlice = VectorSlice.slice (hd, middle, SOME rightLength) val rightSlice = VectorSlice.slice (hd, middle, SOME rightLength)
@@ -111,8 +110,17 @@ struct
val last = Vector.sub (hd, Vector.length hd - 1) val last = Vector.sub (hd, Vector.length hd - 1)
in in
if new < last then if new < last then
(* have to insert in middle *) (* new is or should be in middle *)
insMiddle (new, hd, tl, left, right) let
val middle = BinSearch.equalOrMore (new, hd)
in
if new <> Vector.sub (hd, middle) then
(* not in middle, so insert *)
insMiddle (new, middle, hd, tl, left, right)
else
(* new is in middle, so just return *)
{left = left, right = right}
end
else if new > last then else if new > last then
(* have to insert new at end of left (* have to insert new at end of left
* or start of right (both are equivalent) *) * or start of right (both are equivalent) *)
@@ -146,7 +154,16 @@ struct
in in
if new > first then if new > first then
(* have to insert in middle *) (* have to insert in middle *)
insMiddle (new, hd, tl, left, right) let
val middle = BinSearch.equalOrMore (new, hd)
in
if new <> Vector.sub (hd, middle) then
(* not in middle, so insert *)
insMiddle (new, middle, hd, tl, left, right)
else
(* new is in middle, so return *)
{left = left, right = right}
end
else if new < first then else if new < first then
(* have to insert new at start of right (* have to insert new at start of right
* or end of left (both are equivalent) *) * or end of left (both are equivalent) *)