feat: Add proof continue and root extraction
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538ba6e7d7
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d991533170
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@ -31,14 +31,20 @@ protected def GoalState.create (expr: Expr): M GoalState := do
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--let expr ← instantiateMVars expr
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let goal := (← Meta.mkFreshExprMVar expr (kind := MetavarKind.synthetic) (userName := .anonymous))
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let savedStateMonad: Elab.Tactic.TacticM Elab.Tactic.SavedState := MonadBacktrack.saveState
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let savedState ← savedStateMonad { elaborator := .anonymous } |>.run' { goals := [goal.mvarId!]}
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let root := goal.mvarId!
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let savedState ← savedStateMonad { elaborator := .anonymous } |>.run' { goals := [root]}
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return {
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savedState,
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root := goal.mvarId!,
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newMVars := SSet.empty,
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root,
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newMVars := SSet.insert .empty root,
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}
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protected def GoalState.goals (goalState: GoalState): List MVarId := goalState.savedState.tactic.goals
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private def GoalState.mctx (state: GoalState): MetavarContext :=
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state.savedState.term.meta.meta.mctx
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private def GoalState.mvars (state: GoalState): SSet MVarId :=
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state.mctx.decls.foldl (init := .empty) fun acc k _ => acc.insert k
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def executeTactic (state: Elab.Tactic.SavedState) (goal: MVarId) (tactic: Syntax) :
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M (Except (Array String) (Elab.Tactic.SavedState × List MVarId)):= do
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let tacticM (stx: Syntax): Elab.Tactic.TacticM (Except (Array String) (Elab.Tactic.SavedState × List MVarId)) := do
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@ -93,13 +99,13 @@ protected def GoalState.execute (state: GoalState) (goalId: Nat) (tactic: String
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let prevMCtx := state.savedState.term.meta.meta.mctx
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-- Generate a list of mvarIds that exist in the parent state; Also test the
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-- assertion that the types have not changed on any mvars.
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let newMVars := (← nextMCtx.decls.foldlM (fun acc mvarId mvarDecl => do
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let newMVars ← nextMCtx.decls.foldlM (fun acc mvarId mvarDecl => do
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if let .some prevMVarDecl := prevMCtx.decls.find? mvarId then
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assert! prevMVarDecl.type == mvarDecl.type
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return acc
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else
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return mvarId :: acc
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) []).toSSet
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return acc.insert mvarId
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) SSet.empty
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let nextState: GoalState := {
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savedState := nextSavedState
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root := state.root,
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@ -115,38 +121,70 @@ protected def GoalState.execute (state: GoalState) (goalId: Nat) (tactic: String
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| .none => throwError s!"Parent mvar id does not exist {nextGoal.name}"
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return .success nextState goals.toArray
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/-- After finishing one branch of a proof (`graftee`), pick up from the point where the proof was left off (`target`) -/
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protected def GoalState.continue (target: GoalState) (graftee: GoalState): Except String GoalState :=
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if target.root != graftee.root then
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.error s!"Roots of two continued goal states do not match: {target.root.name} != {graftee.root.name}"
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-- Ensure goals are not dangling
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else if ¬ (target.goals.all (λ goal => graftee.mvars.contains goal)) then
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.error s!"Some goals in target are not present in the graftee"
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else
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-- Set goals to the goals that have not been assigned yet, similar to the `focus` tactic.
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let unassigned := target.goals.filter (λ goal =>
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let mctx := graftee.mctx
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¬(mctx.eAssignment.contains goal || mctx.dAssignment.contains goal))
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.ok {
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savedState := {
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term := graftee.savedState.term,
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tactic := { goals := unassigned },
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},
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root := target.root,
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newMVars := graftee.newMVars,
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}
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protected def GoalState.rootExpr (goalState: GoalState): Option Expr :=
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goalState.mctx.eAssignment.find? goalState.root |>.filter (λ e => ¬ e.hasMVar)
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-- Diagnostics functions
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/-- Print the metavariables in a readable format -/
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protected def GoalState.print (goalState: GoalState) (options: Protocol.GoalPrint := {}): Elab.TermElabM Unit := do
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protected def GoalState.print (goalState: GoalState) (options: Protocol.GoalPrint := {}): M Unit := do
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let savedState := goalState.savedState
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savedState.term.restore
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let goals := savedState.tactic.goals
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let mctx ← getMCtx
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let root := goalState.root
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-- Print the root
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match mctx.decls.find? root with
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| .some decl => printMVar ">" root decl
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| .none => IO.println s!">{root.name}: ??"
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goals.forM (fun mvarId => do
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let pref := "⊢"
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if mvarId != root then
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match mctx.decls.find? mvarId with
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| .some decl => printMVar pref mvarId decl
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| .none => IO.println s!"{pref}{mvarId.name}: ??"
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| .some decl => printMVar "⊢" mvarId decl
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| .none => IO.println s!"⊢{mvarId.name}: ??"
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)
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let goals := goals.toSSet
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mctx.decls.forM (fun mvarId decl => do
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if goals.contains mvarId then
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if goals.contains mvarId || mvarId == root then
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pure ()
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-- Always print the root goal
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else if mvarId == goalState.root then
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printMVar (pref := ">") mvarId decl
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else if ¬(goalState.newMVars.contains mvarId) then
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printMVar (pref := " ") mvarId decl
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-- Print the remainig ones that users don't see in Lean
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else if options.printNonVisible then
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printMVar (pref := "~") mvarId decl
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let pref := if goalState.newMVars.contains mvarId then "~" else " "
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printMVar pref mvarId decl
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else
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IO.println s!" {mvarId.name}{userNameToString decl.userName}"
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pure ()
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--IO.println s!" {mvarId.name}{userNameToString decl.userName}"
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)
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where
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printMVar (pref: String) (mvarId: MVarId) (decl: MetavarDecl): Elab.TermElabM Unit := do
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if options.printContext then
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decl.lctx.fvarIdToDecl.forM printFVar
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IO.println s!"{pref}{mvarId.name}{userNameToString decl.userName}: {← Meta.ppExpr decl.type} {← serialize_expression_ast decl.type}"
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let type_sexp ← serialize_expression_ast (← instantiateMVars decl.type) (sanitize := false)
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IO.println s!"{pref}{mvarId.name}{userNameToString decl.userName}: {← Meta.ppExpr decl.type} {type_sexp}"
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if options.printValue then
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if let Option.some value := (← getMCtx).eAssignment.find? mvarId then
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IO.println s!" = {← Meta.ppExpr value}"
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@ -167,7 +167,8 @@ structure GoalDeleteResult where
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structure GoalPrint where
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printContext: Bool := true
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printValue: Bool := true
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printNonVisible: Bool := true
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printNewMVars: Bool := false
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printNonVisible: Bool := false
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end Pantograph.Protocol
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@ -45,9 +45,11 @@ def type_expr_to_bound (expr: Expr): MetaM Protocol.BoundExpression := do
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return (toString (← fvar.fvarId!.getUserName), toString (← Meta.ppExpr (← fvar.fvarId!.getType)))
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return { binders, target := toString (← Meta.ppExpr body) }
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private def name_to_ast: Lean.Name → String
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| .anonymous
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| .num _ _ => ":anon"
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private def name_to_ast (name: Lean.Name) (sanitize: Bool := true): String := match name with
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| .anonymous => ":anon"
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| .num n i => match sanitize with
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| false => s!"{toString n} {i}"
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| true => ":anon"
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| n@(.str _ _) => toString n
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private def level_depth: Level → Nat
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@ -100,71 +102,73 @@ def serialize_sort_level_ast (level: Level): String :=
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/--
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Completely serializes an expression tree. Json not used due to compactness
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-/
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def serialize_expression_ast (expr: Expr): MetaM String := do
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match expr with
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def serialize_expression_ast (expr: Expr) (sanitize: Bool := true): MetaM String := do
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return self expr
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where
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self (e: Expr): String :=
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match e with
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| .bvar deBruijnIndex =>
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-- This is very common so the index alone is shown. Literals are handled below.
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-- The raw de Bruijn index should never appear in an unbound setting. In
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-- Lean these are handled using a `#` prefix.
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return s!"{deBruijnIndex}"
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s!"{deBruijnIndex}"
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| .fvar fvarId =>
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let name := name_to_ast fvarId.name
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return s!"(:fv {name})"
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let name := of_name fvarId.name
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s!"(:fv {name})"
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| .mvar mvarId =>
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let name := name_to_ast mvarId.name
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return s!"(:mv {name})"
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let name := of_name mvarId.name
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s!"(:mv {name})"
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| .sort level =>
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let level := serialize_sort_level_ast level
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return s!"(:sort {level})"
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s!"(:sort {level})"
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| .const declName _ =>
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-- The universe level of the const expression is elided since it should be
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-- inferrable from surrounding expression
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return s!"(:c {declName})"
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s!"(:c {declName})"
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| .app fn arg =>
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let fn' ← serialize_expression_ast fn
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let arg' ← serialize_expression_ast arg
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return s!"({fn'} {arg'})"
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let fn' := self fn
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let arg' := self arg
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s!"({fn'} {arg'})"
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| .lam binderName binderType body binderInfo =>
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let binderName' := name_to_ast binderName
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let binderType' ← serialize_expression_ast binderType
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let body' ← serialize_expression_ast body
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let binderName' := of_name binderName
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let binderType' := self binderType
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let body' := self body
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let binderInfo' := binder_info_to_ast binderInfo
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return s!"(:lambda {binderName'} {binderType'} {body'}{binderInfo'})"
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s!"(:lambda {binderName'} {binderType'} {body'}{binderInfo'})"
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| .forallE binderName binderType body binderInfo =>
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let binderName' := name_to_ast binderName
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let binderType' ← serialize_expression_ast binderType
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let body' ← serialize_expression_ast body
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let binderName' := of_name binderName
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let binderType' := self binderType
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let body' := self body
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let binderInfo' := binder_info_to_ast binderInfo
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return s!"(:forall {binderName'} {binderType'} {body'}{binderInfo'})"
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s!"(:forall {binderName'} {binderType'} {body'}{binderInfo'})"
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| .letE name type value body _ =>
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-- Dependent boolean flag diacarded
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let name' := name_to_ast name
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let type' ← serialize_expression_ast type
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let value' ← serialize_expression_ast value
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let body' ← serialize_expression_ast body
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return s!"(:let {name'} {type'} {value'} {body'})"
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let type' := self type
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let value' := self value
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let body' := self body
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s!"(:let {name'} {type'} {value'} {body'})"
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| .lit v =>
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-- To not burden the downstream parser who needs to handle this, the literal
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-- is wrapped in a :lit sexp.
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let v' := match v with
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| .natVal val => toString val
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| .strVal val => s!"\"{val}\""
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return s!"(:lit {v'})"
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| .mdata _ expr =>
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s!"(:lit {v'})"
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| .mdata _ inner =>
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-- NOTE: Equivalent to expr itself, but mdata influences the prettyprinter
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-- It may become necessary to incorporate the metadata.
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return (← serialize_expression_ast expr)
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self inner
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| .proj typeName idx struct =>
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let struct' ← serialize_expression_ast struct
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return s!"(:proj {typeName} {idx} {struct'})"
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where
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let struct' := self struct
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s!"(:proj {typeName} {idx} {struct'})"
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-- Elides all unhygenic names
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binder_info_to_ast : Lean.BinderInfo → String
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| .default => ""
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| .implicit => " :implicit"
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| .strictImplicit => " :strictImplicit"
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| .instImplicit => " :instImplicit"
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of_name (name: Name) := name_to_ast name sanitize
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def serialize_expression (options: Protocol.Options) (e: Expr): MetaM Protocol.Expression := do
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let pp := toString (← Meta.ppExpr e)
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@ -189,26 +189,36 @@ def proof_or_comm: TestM Unit := do
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| other => do
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addTest $ assertUnreachable $ other.toString
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return ()
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IO.println "===== 1 ====="
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state1.print
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IO.println "===== 2 ====="
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state2.print
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IO.println "===== 4_1 ====="
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state4_1.print
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let (state3_2, _goal) ← match ← state2.execute (goalId := 1) (tactic := "apply Or.inl") with
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| .success state #[goal] => pure (state, goal)
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| other => do
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addTest $ assertUnreachable $ other.toString
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return ()
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IO.println "===== 3_2 ====="
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state3_2.print
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let state4_2 ← match ← state3_2.execute (goalId := 0) (tactic := "assumption") with
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| .success state #[] => pure state
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| other => do
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addTest $ assertUnreachable $ other.toString
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return ()
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IO.println "===== 4_2 ====="
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state4_2.print
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-- Ensure the proof can continue from `state4_2`.
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let state2b ← match state2.continue state4_2 with
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| .error msg => do
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addTest $ assertUnreachable $ msg
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return ()
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| .ok state => pure state
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addTest $ LSpec.test "state2b" (state2b.goals == [state2.goals.get! 0])
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let (state3_1, _goal) ← match ← state2b.execute (goalId := 0) (tactic := "apply Or.inr") with
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| .success state #[goal] => pure (state, goal)
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| other => do
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addTest $ assertUnreachable $ other.toString
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return ()
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let state4_1 ← match ← state3_1.execute (goalId := 0) (tactic := "assumption") with
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| .success state #[] => pure state
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| other => do
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addTest $ assertUnreachable $ other.toString
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return ()
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IO.println "===== 4_1 ====="
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state4_1.print ({ printNonVisible := false })
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return ()
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where
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