39 lines
1.4 KiB
Text
39 lines
1.4 KiB
Text
/-
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Copyright (c) 2021 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.Meta.Tactic.Split
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import Lean.Elab.Tactic.Basic
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import Lean.Elab.Tactic.Location
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namespace Lean.Elab.Tactic
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open Meta
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@[builtinTactic Lean.Parser.Tactic.split] def evalSplit : Tactic := fun stx => do
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unless stx[1].isNone do
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throwError "'split' tactic, term to split is not supported yet"
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let loc := expandOptLocation stx[2]
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match loc with
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| Location.targets hyps simplifyTarget =>
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if (hyps.size > 0 && simplifyTarget) || hyps.size > 1 then
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throwErrorAt stx[2] "'split' tactic failed, select a single target to split"
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if simplifyTarget then
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liftMetaTactic fun mvarId => do
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let some mvarIds ← splitTarget? mvarId | Meta.throwTacticEx `split mvarId ""
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return mvarIds
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else
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let fvarId ← getFVarId hyps[0]
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liftMetaTactic fun mvarId => do
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let some mvarIds ← splitLocalDecl? mvarId fvarId | Meta.throwTacticEx `split mvarId ""
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return mvarIds
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| Location.wildcard =>
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liftMetaTactic fun mvarId => do
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let fvarIds ← getNondepPropHyps mvarId
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for fvarId in fvarIds do
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if let some mvarIds ← splitLocalDecl? mvarId fvarId then
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return mvarIds
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let some mvarIds ← splitTarget? mvarId | Meta.throwTacticEx `split mvarId ""
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return mvarIds
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end Lean.Elab.Tactic
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