29244f32f6
This upstreams the solve_by_elim tactic from Std. It is a key tactic needed by library_search.
84 lines
3 KiB
Text
84 lines
3 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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prelude
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import Lean.Util.CollectMVars
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import Lean.Meta.Basic
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namespace Lean.Meta
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/--
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Collect unassigned metavariables occurring in the given expression.
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Remark: if `e` contains `?m` and there is a `t` assigned to `?m`, we
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collect unassigned metavariables occurring in `t`.
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Remark: if `e` contains `?m` and `?m` is delayed assigned to some term `t`,
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we collect `?m` and unassigned metavariables occurring in `t`.
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We collect `?m` because it has not been assigned yet. -/
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partial def collectMVars (e : Expr) : StateRefT CollectMVars.State MetaM Unit := do
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let e ← instantiateMVars e
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let s ← get
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let resultSavedSize := s.result.size
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let s := e.collectMVars s
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set s
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for mvarId in s.result[resultSavedSize:] do
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match (← getDelayedMVarAssignment? mvarId) with
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| none => pure ()
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| some d => collectMVars (mkMVar d.mvarIdPending)
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/-- Return metavariables occurring in the given expression. See `collectMVars` -/
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def getMVars (e : Expr) : MetaM (Array MVarId) := do
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let (_, s) ← (collectMVars e).run {}
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pure s.result
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/-- Similar to `getMVars`, but removes delayed assignments. -/
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def getMVarsNoDelayed (e : Expr) : MetaM (Array MVarId) := do
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let mvarIds ← getMVars e
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mvarIds.filterM fun mvarId => not <$> mvarId.isDelayedAssigned
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def collectMVarsAtDecl (d : Declaration) : StateRefT CollectMVars.State MetaM Unit :=
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d.forExprM collectMVars
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def getMVarsAtDecl (d : Declaration) : MetaM (Array MVarId) := do
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let (_, s) ← (collectMVarsAtDecl d).run {}
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pure s.result
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/--
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Collect the metavariables which `mvarId` depends on. These are the metavariables
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which appear in the type and local context of `mvarId`, as well as the
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metavariables which *those* metavariables depend on, etc.
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-/
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partial def _root_.Lean.MVarId.getMVarDependencies (mvarId : MVarId) (includeDelayed := false) :
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MetaM (HashSet MVarId) :=
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(·.snd) <$> (go mvarId).run {}
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where
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/-- Auxiliary definition for `getMVarDependencies`. -/
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addMVars (e : Expr) : StateRefT (HashSet MVarId) MetaM Unit := do
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let mvars ← getMVars e
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let mut s ← get
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set ({} : HashSet MVarId) -- Ensure that `s` is not shared.
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for mvarId in mvars do
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if ← pure includeDelayed <||> notM (mvarId.isDelayedAssigned) then
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s := s.insert mvarId
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set s
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mvars.forM go
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/-- Auxiliary definition for `getMVarDependencies`. -/
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go (mvarId : MVarId) : StateRefT (HashSet MVarId) MetaM Unit :=
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withIncRecDepth do
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let mdecl ← mvarId.getDecl
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addMVars mdecl.type
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for ldecl in mdecl.lctx do
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addMVars ldecl.type
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if let (some val) := ldecl.value? then
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addMVars val
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if let (some ass) ← getDelayedMVarAssignment? mvarId then
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let pendingMVarId := ass.mvarIdPending
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if ← notM pendingMVarId.isAssignedOrDelayedAssigned then
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modify (·.insert pendingMVarId)
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go pendingMVarId
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end Lean.Meta
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