cf3b8d4eb4
Make the code style more uniform. We still have a lot of leftovers from the old frontend.
35 lines
1 KiB
Text
35 lines
1 KiB
Text
/-
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Copyright (c) 2020 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.Util.ReplaceExpr
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namespace Lean.Meta
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/- A mapping from MVarId to MVarId -/
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structure MVarRenaming where
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map : MVarIdMap MVarId := {}
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def MVarRenaming.isEmpty (s : MVarRenaming) : Bool :=
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s.map.isEmpty
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def MVarRenaming.find? (s : MVarRenaming) (mvarId : MVarId) : Option MVarId :=
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s.map.find? mvarId
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def MVarRenaming.find! (s : MVarRenaming) (mvarId : MVarId) : MVarId :=
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(s.find? mvarId).get!
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def MVarRenaming.insert (s : MVarRenaming) (mvarId mvarId' : MVarId) : MVarRenaming :=
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{ s with map := s.map.insert mvarId mvarId' }
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def MVarRenaming.apply (s : MVarRenaming) (e : Expr) : Expr :=
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if !e.hasMVar then e
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else if s.map.isEmpty then e
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else e.replace fun e => match e with
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| Expr.mvar mvarId _ => match s.map.find? mvarId with
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| none => e
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| some newMVarId => mkMVar newMVarId
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| _ => none
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end Lean.Meta
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