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Pantograph
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chore: Version 0.3 #136

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3
Pantograph.lean
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@ -1,7 +1,8 @@
import Pantograph.Delate
import Pantograph.Elab
import Pantograph.Environment
import Pantograph.Frontend
import Pantograph.Goal
import Pantograph.Library
import Pantograph.Protocol
import Pantograph.Delate
import Pantograph.Version

197
Pantograph/Delate.lean
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@ -2,7 +2,7 @@
This file handles "Delation": The conversion of Kernel view into Search view.
-/
import Lean
import Pantograph.Expr
import Std.Data.HashMap
import Pantograph.Goal
import Pantograph.Protocol
@ -11,6 +11,163 @@ open Lean
-- Symbol processing functions --
namespace Pantograph
structure ProjectionApplication where
projector: Name
numParams: Nat
inner: Expr
@[export pantograph_expr_proj_to_app]
def exprProjToApp (env: Environment) (e: Expr): ProjectionApplication :=
let (typeName, idx, inner) := match e with
| .proj typeName idx inner => (typeName, idx, inner)
| _ => panic! "Argument must be proj"
let ctor := getStructureCtor env typeName
let fieldName := getStructureFields env typeName |>.get! idx
let projector := getProjFnForField? env typeName fieldName |>.get!
{
projector,
numParams := ctor.numParams,
inner,
}
def _root_.Lean.Name.isAuxLemma (n : Lean.Name) : Bool := n matches .num (.str _ "_auxLemma") _
/-- Unfold all lemmas created by `Lean.Meta.mkAuxLemma`. These end in `_auxLemma.nn` where `nn` is a number. -/
@[export pantograph_unfold_aux_lemmas]
def unfoldAuxLemmas (e : Expr) : CoreM Expr := do
Lean.Meta.deltaExpand e Lean.Name.isAuxLemma
/--
Force the instantiation of delayed metavariables even if they cannot be fully
instantiated. This is used during resumption to provide diagnostic data about
the current goal.
Since Lean 4 does not have an `Expr` constructor corresponding to delayed
metavariables, any delayed metavariables must be recursively handled by this
function to ensure that nested delayed metavariables can be properly processed.
The caveat is this recursive call will lead to infinite recursion if a loop
between metavariable assignment exists.
This function ensures any metavariable in the result is either
1. Delayed assigned with its pending mvar not assigned in any form
2. Not assigned (delay or not)
-/
partial def instantiateDelayedMVars (eOrig: Expr) : MetaM Expr := do
--let padding := String.join $ List.replicate level "│ "
--IO.println s!"{padding}Starting {toString eOrig}"
let mut result ← Meta.transform (← instantiateMVars eOrig)
(pre := fun e => e.withApp fun f args => do
let .mvar mvarId := f | return .continue
--IO.println s!"{padding}├V {e}"
let mvarDecl ← mvarId.getDecl
-- This is critical to maintaining the interdependency of metavariables.
-- Without setting `.syntheticOpaque`, Lean's metavariable elimination
-- system will not make the necessary delayed assigned mvars in case of
-- nested mvars.
mvarId.setKind .syntheticOpaque
mvarId.withContext do
let lctx ← MonadLCtx.getLCtx
if mvarDecl.lctx.any (λ decl => !lctx.contains decl.fvarId) then
let violations := mvarDecl.lctx.decls.foldl (λ acc decl? => match decl? with
| .some decl => if lctx.contains decl.fvarId then acc else acc ++ [decl.fvarId.name]
| .none => acc) []
panic! s!"In the context of {mvarId.name}, there are local context variable violations: {violations}"
if let .some assign ← getExprMVarAssignment? mvarId then
--IO.println s!"{padding}├A ?{mvarId.name}"
assert! !(← mvarId.isDelayedAssigned)
return .visit (mkAppN assign args)
else if let some { fvars, mvarIdPending } ← getDelayedMVarAssignment? mvarId then
--let substTableStr := String.intercalate ", " $ Array.zipWith fvars args (λ fvar assign => s!"{fvar.fvarId!.name} := {assign}") |>.toList
--IO.println s!"{padding}├MD ?{mvarId.name} := ?{mvarIdPending.name} [{substTableStr}]"
if args.size < fvars.size then
throwError "Not enough arguments to instantiate a delay assigned mvar. This is due to bad implementations of a tactic: {args.size} < {fvars.size}. Expr: {toString e}; Origin: {toString eOrig}"
--if !args.isEmpty then
--IO.println s!"{padding}├── Arguments Begin"
let args ← args.mapM self
--if !args.isEmpty then
--IO.println s!"{padding}├── Arguments End"
if !(← mvarIdPending.isAssignedOrDelayedAssigned) then
--IO.println s!"{padding}├T1"
let result := mkAppN f args
return .done result
let pending ← mvarIdPending.withContext do
let inner ← instantiateDelayedMVars (.mvar mvarIdPending) --(level := level + 1)
--IO.println s!"{padding}├Pre: {inner}"
pure <| (← inner.abstractM fvars).instantiateRev args
-- Tail arguments
let result := mkAppRange pending fvars.size args.size args
--IO.println s!"{padding}├MD {result}"
return .done result
else
assert! !(← mvarId.isAssigned)
assert! !(← mvarId.isDelayedAssigned)
--if !args.isEmpty then
-- IO.println s!"{padding}├── Arguments Begin"
let args ← args.mapM self
--if !args.isEmpty then
-- IO.println s!"{padding}├── Arguments End"
--IO.println s!"{padding}├M ?{mvarId.name}"
return .done (mkAppN f args))
--IO.println s!"{padding}└Result {result}"
return result
where
self e := instantiateDelayedMVars e --(level := level + 1)
/--
Convert an expression to an equiavlent form with
1. No nested delayed assigned mvars
2. No aux lemmas
3. No assigned mvars
-/
@[export pantograph_instantiate_all_m]
def instantiateAll (e: Expr): MetaM Expr := do
let e ← instantiateDelayedMVars e
let e ← unfoldAuxLemmas e
return e
structure DelayedMVarInvocation where
mvarIdPending: MVarId
args: Array (FVarId × (Option Expr))
-- Extra arguments applied to the result of this substitution
tail: Array Expr
-- The pending mvar of any delayed assigned mvar must not be assigned in any way.
@[export pantograph_to_delayed_mvar_invocation_m]
def toDelayedMVarInvocation (e: Expr): MetaM (Option DelayedMVarInvocation) := do
let .mvar mvarId := e.getAppFn | return .none
let .some decl ← getDelayedMVarAssignment? mvarId | return .none
let mvarIdPending := decl.mvarIdPending
let mvarDecl ← mvarIdPending.getDecl
-- Print the function application e. See Lean's `withOverApp`
let args := e.getAppArgs
assert! args.size ≥ decl.fvars.size
assert! !(← mvarIdPending.isAssigned)
assert! !(← mvarIdPending.isDelayedAssigned)
let fvarArgMap: Std.HashMap FVarId Expr := Std.HashMap.ofList $ (decl.fvars.map (·.fvarId!) |>.zip args).toList
let subst ← mvarDecl.lctx.foldlM (init := []) λ acc localDecl => do
let fvarId := localDecl.fvarId
let a := fvarArgMap[fvarId]?
return acc ++ [(fvarId, a)]
assert! decl.fvars.all (λ fvar => mvarDecl.lctx.findFVar? fvar |>.isSome)
return .some {
mvarIdPending,
args := subst.toArray,
tail := args.toList.drop decl.fvars.size |>.toArray,
}
-- Condensed representation
namespace Condensed
-- Mirrors Lean's LocalDecl
@ -32,12 +189,6 @@ structure Goal where
@[export pantograph_goal_is_lhs]
def isLHS (g: Goal) : Bool := isLHSGoal? g.target |>.isSome
-- Functions for creating contexts and states
@[export pantograph_elab_context]
def elabContext: Elab.Term.Context := {
errToSorry := false
}
end Condensed
-- Get the list of visible (by default) free variables from a goal
@ -97,38 +248,6 @@ protected def GoalState.toCondensed (state: GoalState):
| .none => throwError s!"Metavariable does not exist in context {goal.name}"
metaM.run' (s := state.savedState.term.meta.meta)
--- Input Functions ---
/-- Read syntax object from string -/
def parseTerm (env: Environment) (s: String): Except String Syntax :=
Parser.runParserCategory
(env := env)
(catName := `term)
(input := s)
(fileName := "<stdin>")
def parseTermM [Monad m] [MonadEnv m] (s: String): m (Except String Syntax) := do
return Parser.runParserCategory
(env := ← MonadEnv.getEnv)
(catName := `term)
(input := s)
(fileName := "<stdin>")
/-- Parse a syntax object. May generate additional metavariables! -/
def elabType (syn: Syntax): Elab.TermElabM (Except String Expr) := do
try
let expr ← Elab.Term.elabType syn
return .ok expr
catch ex => return .error (← ex.toMessageData.toString)
def elabTerm (syn: Syntax) (expectedType? : Option Expr := .none): Elab.TermElabM (Except String Expr) := do
try
let expr ← Elab.Term.elabTerm (stx := syn) expectedType?
return .ok expr
catch ex => return .error (← ex.toMessageData.toString)
--- Output Functions ---
def typeExprToBound (expr: Expr): MetaM Protocol.BoundExpression := do
Meta.forallTelescope expr fun arr body => do
let binders ← arr.mapM fun fvar => do

40
Pantograph/Elab.lean Normal file
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@ -0,0 +1,40 @@
import Lean
open Lean
namespace Pantograph
-- Functions for creating contexts and states
@[export pantograph_default_elab_context]
def defaultElabContext: Elab.Term.Context := {
errToSorry := false
}
/-- Read syntax object from string -/
def parseTerm (env: Environment) (s: String): Except String Syntax :=
Parser.runParserCategory
(env := env)
(catName := `term)
(input := s)
(fileName := "<stdin>")
def parseTermM [Monad m] [MonadEnv m] (s: String): m (Except String Syntax) := do
return Parser.runParserCategory
(env := ← MonadEnv.getEnv)
(catName := `term)
(input := s)
(fileName := "<stdin>")
/-- Parse a syntax object. May generate additional metavariables! -/
def elabType (syn: Syntax): Elab.TermElabM (Except String Expr) := do
try
let expr ← Elab.Term.elabType syn
return .ok expr
catch ex => return .error (← ex.toMessageData.toString)
def elabTerm (syn: Syntax) (expectedType? : Option Expr := .none): Elab.TermElabM (Except String Expr) := do
try
let expr ← Elab.Term.elabTerm (stx := syn) expectedType?
return .ok expr
catch ex => return .error (← ex.toMessageData.toString)
end Pantograph

3
Pantograph/Environment.lean
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@ -1,5 +1,6 @@
import Pantograph.Protocol
import Pantograph.Delate
import Pantograph.Elab
import Pantograph.Protocol
import Lean
open Lean

162
Pantograph/Expr.lean
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@ -1,162 +0,0 @@
import Lean
import Std.Data.HashMap
open Lean
namespace Pantograph
structure ProjectionApplication where
projector: Name
numParams: Nat
inner: Expr
@[export pantograph_expr_proj_to_app]
def exprProjToApp (env: Environment) (e: Expr): ProjectionApplication :=
let (typeName, idx, inner) := match e with
| .proj typeName idx inner => (typeName, idx, inner)
| _ => panic! "Argument must be proj"
let ctor := getStructureCtor env typeName
let fieldName := getStructureFields env typeName |>.get! idx
let projector := getProjFnForField? env typeName fieldName |>.get!
{
projector,
numParams := ctor.numParams,
inner,
}
def _root_.Lean.Name.isAuxLemma (n : Lean.Name) : Bool := n matches .num (.str _ "_auxLemma") _
/-- Unfold all lemmas created by `Lean.Meta.mkAuxLemma`. These end in `_auxLemma.nn` where `nn` is a number. -/
@[export pantograph_unfold_aux_lemmas]
def unfoldAuxLemmas (e : Expr) : CoreM Expr := do
Lean.Meta.deltaExpand e Lean.Name.isAuxLemma
/--
Force the instantiation of delayed metavariables even if they cannot be fully
instantiated. This is used during resumption to provide diagnostic data about
the current goal.
Since Lean 4 does not have an `Expr` constructor corresponding to delayed
metavariables, any delayed metavariables must be recursively handled by this
function to ensure that nested delayed metavariables can be properly processed.
The caveat is this recursive call will lead to infinite recursion if a loop
between metavariable assignment exists.
This function ensures any metavariable in the result is either
1. Delayed assigned with its pending mvar not assigned in any form
2. Not assigned (delay or not)
-/
partial def instantiateDelayedMVars (eOrig: Expr) : MetaM Expr := do
--let padding := String.join $ List.replicate level "│ "
--IO.println s!"{padding}Starting {toString eOrig}"
let mut result ← Meta.transform (← instantiateMVars eOrig)
(pre := fun e => e.withApp fun f args => do
let .mvar mvarId := f | return .continue
--IO.println s!"{padding}├V {e}"
let mvarDecl ← mvarId.getDecl
-- This is critical to maintaining the interdependency of metavariables.
-- Without setting `.syntheticOpaque`, Lean's metavariable elimination
-- system will not make the necessary delayed assigned mvars in case of
-- nested mvars.
mvarId.setKind .syntheticOpaque
mvarId.withContext do
let lctx ← MonadLCtx.getLCtx
if mvarDecl.lctx.any (λ decl => !lctx.contains decl.fvarId) then
let violations := mvarDecl.lctx.decls.foldl (λ acc decl? => match decl? with
| .some decl => if lctx.contains decl.fvarId then acc else acc ++ [decl.fvarId.name]
| .none => acc) []
panic! s!"In the context of {mvarId.name}, there are local context variable violations: {violations}"
if let .some assign ← getExprMVarAssignment? mvarId then
--IO.println s!"{padding}├A ?{mvarId.name}"
assert! !(← mvarId.isDelayedAssigned)
return .visit (mkAppN assign args)
else if let some { fvars, mvarIdPending } ← getDelayedMVarAssignment? mvarId then
--let substTableStr := String.intercalate ", " $ Array.zipWith fvars args (λ fvar assign => s!"{fvar.fvarId!.name} := {assign}") |>.toList
--IO.println s!"{padding}├MD ?{mvarId.name} := ?{mvarIdPending.name} [{substTableStr}]"
if args.size < fvars.size then
throwError "Not enough arguments to instantiate a delay assigned mvar. This is due to bad implementations of a tactic: {args.size} < {fvars.size}. Expr: {toString e}; Origin: {toString eOrig}"
--if !args.isEmpty then
--IO.println s!"{padding}├── Arguments Begin"
let args ← args.mapM self
--if !args.isEmpty then
--IO.println s!"{padding}├── Arguments End"
if !(← mvarIdPending.isAssignedOrDelayedAssigned) then
--IO.println s!"{padding}├T1"
let result := mkAppN f args
return .done result
let pending ← mvarIdPending.withContext do
let inner ← instantiateDelayedMVars (.mvar mvarIdPending) --(level := level + 1)
--IO.println s!"{padding}├Pre: {inner}"
pure <| (← inner.abstractM fvars).instantiateRev args
-- Tail arguments
let result := mkAppRange pending fvars.size args.size args
--IO.println s!"{padding}├MD {result}"
return .done result
else
assert! !(← mvarId.isAssigned)
assert! !(← mvarId.isDelayedAssigned)
--if !args.isEmpty then
-- IO.println s!"{padding}├── Arguments Begin"
let args ← args.mapM self
--if !args.isEmpty then
-- IO.println s!"{padding}├── Arguments End"
--IO.println s!"{padding}├M ?{mvarId.name}"
return .done (mkAppN f args))
--IO.println s!"{padding}└Result {result}"
return result
where
self e := instantiateDelayedMVars e --(level := level + 1)
/--
Convert an expression to an equiavlent form with
1. No nested delayed assigned mvars
2. No aux lemmas
3. No assigned mvars
-/
@[export pantograph_instantiate_all_m]
def instantiateAll (e: Expr): MetaM Expr := do
let e ← instantiateDelayedMVars e
let e ← unfoldAuxLemmas e
return e
structure DelayedMVarInvocation where
mvarIdPending: MVarId
args: Array (FVarId × (Option Expr))
-- Extra arguments applied to the result of this substitution
tail: Array Expr
-- The pending mvar of any delayed assigned mvar must not be assigned in any way.
@[export pantograph_to_delayed_mvar_invocation_m]
def toDelayedMVarInvocation (e: Expr): MetaM (Option DelayedMVarInvocation) := do
let .mvar mvarId := e.getAppFn | return .none
let .some decl ← getDelayedMVarAssignment? mvarId | return .none
let mvarIdPending := decl.mvarIdPending
let mvarDecl ← mvarIdPending.getDecl
-- Print the function application e. See Lean's `withOverApp`
let args := e.getAppArgs
assert! args.size ≥ decl.fvars.size
assert! !(← mvarIdPending.isAssigned)
assert! !(← mvarIdPending.isDelayedAssigned)
let fvarArgMap: Std.HashMap FVarId Expr := Std.HashMap.ofList $ (decl.fvars.map (·.fvarId!) |>.zip args).toList
let subst ← mvarDecl.lctx.foldlM (init := []) λ acc localDecl => do
let fvarId := localDecl.fvarId
let a := fvarArgMap[fvarId]?
return acc ++ [(fvarId, a)]
assert! decl.fvars.all (λ fvar => mvarDecl.lctx.findFVar? fvar |>.isSome)
return .some {
mvarIdPending,
args := subst.toArray,
tail := args.toList.drop decl.fvars.size |>.toArray,
}
end Pantograph

2
Pantograph/Library.lean
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@ -41,7 +41,7 @@ namespace Pantograph
def runMetaM { α } (metaM: MetaM α): CoreM α :=
metaM.run'
def runTermElabM { α } (termElabM: Elab.TermElabM α): CoreM α :=
termElabM.run' (ctx := Condensed.elabContext) |>.run'
termElabM.run' (ctx := defaultElabContext) |>.run'
def errorI (type desc: String): Protocol.InteractionError := { error := type, desc := desc }

2
Repl.lean
View File

@ -22,7 +22,7 @@ abbrev CR α := Except Protocol.InteractionError α
def runMetaInMainM { α } (metaM: Lean.MetaM α): MainM α :=
metaM.run'
def runTermElabInMainM { α } (termElabM: Lean.Elab.TermElabM α) : MainM α :=
termElabM.run' (ctx := Condensed.elabContext) |>.run'
termElabM.run' (ctx := defaultElabContext) |>.run'
def execute (command: Protocol.Command): MainM Lean.Json := do
let run { α β: Type } [Lean.FromJson α] [Lean.ToJson β] (comm: α → MainM (CR β)): MainM Lean.Json :=

4
Test/Common.lean
View File

@ -89,9 +89,9 @@ def runCoreMSeq (env: Environment) (coreM: CoreM LSpec.TestSeq) (options: Array
def runMetaMSeq (env: Environment) (metaM: MetaM LSpec.TestSeq): IO LSpec.TestSeq :=
runCoreMSeq env metaM.run'
def runTermElabMInMeta { α } (termElabM: Lean.Elab.TermElabM α): Lean.MetaM α :=
termElabM.run' (ctx := Condensed.elabContext)
termElabM.run' (ctx := defaultElabContext)
def runTermElabMSeq (env: Environment) (termElabM: Elab.TermElabM LSpec.TestSeq): IO LSpec.TestSeq :=
runMetaMSeq env $ termElabM.run' (ctx := Condensed.elabContext)
runMetaMSeq env $ termElabM.run' (ctx := defaultElabContext)
def exprToStr (e: Expr): Lean.MetaM String := toString <$> Meta.ppExpr e

4
Test/Delate.lean
View File

@ -64,7 +64,7 @@ def test_sexp_of_elab (env: Environment): IO LSpec.TestSeq := do
| .ok expr => pure expr
| .error e => return elabFailure e
return LSpec.check source ((← serializeExpressionSexp expr) = target)
let metaM := (Elab.Term.withLevelNames levels termElabM).run' (ctx := Condensed.elabContext)
let metaM := (Elab.Term.withLevelNames levels termElabM).run' (ctx := defaultElabContext)
return LSpec.TestSeq.append suites (← runMetaMSeq env metaM))
LSpec.TestSeq.done
@ -85,7 +85,7 @@ def test_sexp_of_expr (env: Environment): IO LSpec.TestSeq := do
let testCaseName := target.take 10
let test := LSpec.check testCaseName ((← serializeExpressionSexp expr) = target)
return LSpec.TestSeq.append suites test) LSpec.TestSeq.done
runMetaMSeq env $ termElabM.run' (ctx := Condensed.elabContext)
runMetaMSeq env $ termElabM.run' (ctx := defaultElabContext)
-- Instance parsing
def test_instance (env: Environment): IO LSpec.TestSeq :=

2
Test/Metavar.lean
View File

@ -66,7 +66,7 @@ def proofRunner (env: Lean.Environment) (tests: TestM Unit): IO LSpec.TestSeq :=
let termElabM := tests.run LSpec.TestSeq.done |>.run {} -- with default options
let coreContext: Lean.Core.Context ← createCoreContext #[]
let metaM := termElabM.run' (ctx := Condensed.elabContext)
let metaM := termElabM.run' (ctx := defaultElabContext)
let coreM := metaM.run'
match ← (coreM.run' coreContext { env := env }).toBaseIO with
| .error exception =>

2
Test/Proofs.lean
View File

@ -74,7 +74,7 @@ def proofRunner (env: Lean.Environment) (tests: TestM Unit): IO LSpec.TestSeq :=
let termElabM := tests.run LSpec.TestSeq.done |>.run {} -- with default options
let coreContext: Lean.Core.Context ← createCoreContext #[]
let metaM := termElabM.run' (ctx := Condensed.elabContext)
let metaM := termElabM.run' (ctx := defaultElabContext)
let coreM := metaM.run'
match ← (coreM.run' coreContext { env := env }).toBaseIO with
| .error exception =>