3faa033705
Motivation: `WHNFUtil` will provide a parametric implementation for WHNF. We will use it to implement `TypeUtil` and `matchPattern`.
54 lines
2.5 KiB
Text
54 lines
2.5 KiB
Text
/-
|
||
Copyright (c) 2019 Microsoft Corporation. All rights reserved.
|
||
Released under Apache 2.0 license as described in the file LICENSE.
|
||
Authors: Leonardo de Moura
|
||
-/
|
||
prelude
|
||
import Init.Lean.Environment
|
||
|
||
namespace Lean
|
||
|
||
/- Given a structure `S`, Lean automatically creates an auxiliary definition (projection function)
|
||
for each field. This structure caches information about these auxiliary definitions. -/
|
||
structure ProjectionFunctionInfo :=
|
||
(ctorName : Name) -- Constructor associated with the auxiliary projection function.
|
||
(nparams : Nat) -- Number of parameters in the structure
|
||
(i : Nat) -- The field index associated with the auxiliary projection function.
|
||
(fromClass : Bool) -- `true` if the structure is a class
|
||
|
||
instance ProjectionFunctionInfo.inhabited : Inhabited ProjectionFunctionInfo :=
|
||
⟨{ ctorName := arbitrary _, nparams := arbitrary _, i := 0, fromClass := false }⟩
|
||
|
||
def mkProjectionFnInfoExtension : IO (SimplePersistentEnvExtension (Name × ProjectionFunctionInfo) (NameMap ProjectionFunctionInfo)) :=
|
||
registerSimplePersistentEnvExtension {
|
||
name := `projinfo,
|
||
addImportedFn := fun as => {},
|
||
addEntryFn := fun s p => s.insert p.1 p.2,
|
||
toArrayFn := fun es => es.toArray.qsort (fun a b => Name.quickLt a.1 b.1)
|
||
}
|
||
|
||
@[init mkProjectionFnInfoExtension]
|
||
constant projectionFnInfoExt : SimplePersistentEnvExtension (Name × ProjectionFunctionInfo) (NameMap ProjectionFunctionInfo) := arbitrary _
|
||
|
||
@[export lean_add_projection_info]
|
||
def addProjectionFnInfo (env : Environment) (projName : Name) (ctorName : Name) (nparams : Nat) (i : Nat) (fromClass : Bool) : Environment :=
|
||
projectionFnInfoExt.addEntry env (projName, { ctorName := ctorName, nparams := nparams, i := i, fromClass := fromClass })
|
||
|
||
namespace Environment
|
||
|
||
@[export lean_get_projection_info]
|
||
def getProjectionFnInfo (env : Environment) (projName : Name) : Option ProjectionFunctionInfo :=
|
||
match env.getModuleIdxFor projName with
|
||
| some modIdx =>
|
||
match (projectionFnInfoExt.getModuleEntries env modIdx).binSearch (projName, arbitrary _) (fun a b => Name.quickLt a.1 b.1) with
|
||
| some e => some e.2
|
||
| none => none
|
||
| none => (projectionFnInfoExt.getState env).find projName
|
||
|
||
def isProjectionFn (env : Environment) (n : Name) : Bool :=
|
||
match env.getModuleIdxFor n with
|
||
| some modIdx => (projectionFnInfoExt.getModuleEntries env modIdx).binSearchContains (n, arbitrary _) (fun a b => Name.quickLt a.1 b.1)
|
||
| none => (projectionFnInfoExt.getState env).contains n
|
||
|
||
end Environment
|
||
end Lean
|