ea6eee516b
Motivation: use same separator used in lambda expressions as in other programming languages.
54 lines
2.5 KiB
Text
54 lines
2.5 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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prelude
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import init.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 :=
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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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instance ProjectionFunctionInfo.inhabited : Inhabited ProjectionFunctionInfo :=
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⟨{ ctorName := default _, nparams := default _, i := 0, fromClass := false }⟩
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def mkProjectionFnInfoExtension : IO (SimplePersistentEnvExtension (Name × ProjectionFunctionInfo) (NameMap ProjectionFunctionInfo)) :=
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registerSimplePersistentEnvExtension {
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name := `projinfo,
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addImportedFn := fun as => {},
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addEntryFn := fun s p => s.insert p.1 p.2,
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toArrayFn := fun es => es.toArray.qsort (fun a b => Name.quickLt a.1 b.1)
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}
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@[init mkProjectionFnInfoExtension]
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constant projectionFnInfoExt : SimplePersistentEnvExtension (Name × ProjectionFunctionInfo) (NameMap ProjectionFunctionInfo) := default _
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@[export lean.add_projection_info_core]
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def addProjectionFnInfo (env : Environment) (projName : Name) (ctorName : Name) (nparams : Nat) (i : Nat) (fromClass : Bool) : Environment :=
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projectionFnInfoExt.addEntry 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_core]
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def getProjectionFnInfo (env : Environment) (projName : Name) : Option ProjectionFunctionInfo :=
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match env.getModuleIdxFor projName with
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| some modIdx =>
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match (projectionFnInfoExt.getModuleEntries env modIdx).binSearch (projName, default _) (fun a b => Name.quickLt a.1 b.1) with
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| some e => some e.2
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| none => none
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| none => (projectionFnInfoExt.getState env).find projName
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def isProjectionFn (env : Environment) (n : Name) : Bool :=
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match env.getModuleIdxFor n with
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| some modIdx => (projectionFnInfoExt.getModuleEntries env modIdx).binSearchContains (n, default _) (fun a b => Name.quickLt a.1 b.1)
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| none => (projectionFnInfoExt.getState env).contains n
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end Environment
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end Lean
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