38 lines
1.5 KiB
Text
38 lines
1.5 KiB
Text
/-
|
|
Copyright (c) 2022 Microsoft Corporation. All rights reserved.
|
|
Released under Apache 2.0 license as described in the file LICENSE.
|
|
Authors: Leonardo de Moura
|
|
-/
|
|
prelude
|
|
import Lean.Expr
|
|
|
|
namespace Lean
|
|
|
|
structure HasConstCache (declName : Name) where
|
|
cache : HashMapImp Expr Bool := mkHashMapImp
|
|
|
|
unsafe def HasConstCache.containsUnsafe (e : Expr) : StateM (HasConstCache declName) Bool := do
|
|
if let some r := (← get).cache.find? (beq := ⟨ptrEq⟩) e then
|
|
return r
|
|
else
|
|
match e with
|
|
| .const n .. => return n == declName
|
|
| .app f a => cache e (← containsUnsafe f <||> containsUnsafe a)
|
|
| .lam _ d b _ => cache e (← containsUnsafe d <||> containsUnsafe b)
|
|
| .forallE _ d b _ => cache e (← containsUnsafe d <||> containsUnsafe b)
|
|
| .letE _ t v b _ => cache e (← containsUnsafe t <||> containsUnsafe v <||> containsUnsafe b)
|
|
| .mdata _ b => cache e (← containsUnsafe b)
|
|
| .proj _ _ b => cache e (← containsUnsafe b)
|
|
| _ => return false
|
|
where
|
|
cache (e : Expr) (r : Bool) : StateM (HasConstCache declName) Bool := do
|
|
modify fun ⟨cache⟩ => ⟨cache.insert (beq := ⟨ptrEq⟩) e r |>.1⟩
|
|
return r
|
|
|
|
/--
|
|
Return true iff `e` contains the constant `declName`.
|
|
Remark: the results for visited expressions are stored in the state cache. -/
|
|
@[implemented_by HasConstCache.containsUnsafe]
|
|
opaque HasConstCache.contains (e : Expr) : StateM (HasConstCache declName) Bool
|
|
|
|
end Lean
|