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Made filter more efficient #19

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8 changes: 7 additions & 1 deletion Ssreflect/Elim.lean
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,12 @@ open Lean Lean.Expr Lean.Meta
open Lean Elab Command Term Meta Tactic
-- open Lean.Elab.Tactic.Conv.PatternMatchState

namespace Lean.PersistentArray
@[inline] def filterMap (as : PersistentArray α) (p : α → Option β) : PersistentArray β :=
as.foldl (init := {}) fun asNew a => match p a with | some b => asNew.push b | none => asNew
end Lean.PersistentArray


elab "scase" : tactic => newTactic do
let hyps <- getLCtx
let name <- fresh "H"
Expand Down Expand Up @@ -35,7 +41,7 @@ elab_rules : tactic
newTactic do
if (<-getUnsolvedGoals).length - goals != 0 then failure
let hypsNew <- getLCtx
let newLtx := (hypsNew.decls.filter Option.isSome).map Option.get!
let newLtx := hypsNew.decls.filterMap id
let newLtx := newLtx.filter (Option.isNone <| hyps.findFromUserName? ·.userName)
let mut newLtx := newLtx.toArray
if newLtx.size = 0 then failure
Expand Down