59 lines
2.6 KiB
Text
59 lines
2.6 KiB
Text
/-
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Copyright (c) 2019 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura
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-/
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import Lean.Environment
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namespace Lean
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/- Given a structure `S`, Lean automatically creates an auxiliary definition (projection function)
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for each field. This structure caches information about these auxiliary definitions. -/
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structure ProjectionFunctionInfo where
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ctorName : Name -- Constructor associated with the auxiliary projection function.
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nparams : Nat -- Number of parameters in the structure
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i : Nat -- The field index associated with the auxiliary projection function.
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fromClass : Bool -- `true` if the structure is a class
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@[export lean_mk_projection_info]
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def mkProjectionInfoEx (ctorName : Name) (nparams : Nat) (i : Nat) (fromClass : Bool) : ProjectionFunctionInfo :=
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{ctorName := ctorName, nparams := nparams, i := i, fromClass := fromClass }
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@[export lean_projection_info_from_class]
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def ProjectionFunctionInfo.fromClassEx (info : ProjectionFunctionInfo) : Bool := info.fromClass
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instance : Inhabited ProjectionFunctionInfo :=
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⟨{ ctorName := arbitrary, nparams := arbitrary, i := 0, fromClass := false }⟩
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builtin_initialize projectionFnInfoExt : MapDeclarationExtension ProjectionFunctionInfo ← mkMapDeclarationExtension `projinfo
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@[export lean_add_projection_info]
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def addProjectionFnInfo (env : Environment) (projName : Name) (ctorName : Name) (nparams : Nat) (i : Nat) (fromClass : Bool) : Environment :=
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projectionFnInfoExt.insert env projName { ctorName := ctorName, nparams := nparams, i := i, fromClass := fromClass }
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namespace Environment
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@[export lean_get_projection_info]
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def getProjectionFnInfo? (env : Environment) (projName : Name) : Option ProjectionFunctionInfo :=
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projectionFnInfoExt.find? env projName
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def isProjectionFn (env : Environment) (declName : Name) : Bool :=
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projectionFnInfoExt.contains env declName
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/-- If `projName` is the name of a projection function, return the associated structure name -/
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def getProjectionStructureName? (env : Environment) (projName : Name) : Option Name :=
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match env.getProjectionFnInfo? projName with
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| none => none
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| some projInfo =>
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match env.find? projInfo.ctorName with
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| some (ConstantInfo.ctorInfo val) => some val.induct
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| _ => none
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end Environment
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def isProjectionFn [MonadEnv m] [Monad m] (declName : Name) : m Bool :=
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return (← getEnv).isProjectionFn declName
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def getProjectionFnInfo? [MonadEnv m] [Monad m] (declName : Name) : m (Option ProjectionFunctionInfo) :=
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return (← getEnv).getProjectionFnInfo? declName
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end Lean
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