Pantograph.lean

@@ -71,7 +71,7 @@ def execute (command: Protocol.Command): MainM Lean.Json := do
     Environment.addDecl args
   expr_echo (args: Protocol.ExprEcho): MainM (CR Protocol.ExprEchoResult) := do
     let state ← get
-    exprEcho args.expr state.options
+    exprEcho args.expr args.type? state.options
   options_set (args: Protocol.OptionsSet): MainM (CR Protocol.OptionsSetResult) := do
     let state ← get
     let options := state.options
@@ -93,11 +93,7 @@ def execute (command: Protocol.Command): MainM Lean.Json := do
     let state ← get
     let env ← Lean.MonadEnv.getEnv
     let expr?: Except _ GoalState ← runTermElabM (match args.expr, args.copyFrom with
-      | .some expr, .none => do
+      | .some expr, .none => goalStartExpr expr
-        let expr ← match ← exprParse expr with
-          | .error e => return .error e
-          | .ok expr => pure $ expr
-        return .ok $ ← GoalState.create expr
       | .none, .some copyFrom =>
         (match env.find? <| copyFrom.toName with
         | .none => return .error <| errorIndex s!"Symbol not found: {copyFrom}"
@@ -152,7 +148,7 @@ def execute (command: Protocol.Command): MainM Lean.Json := do
         | .some branchId, .none => do
           match state.goalStates.find? branchId with
           | .none => return .error $ errorIndex s!"Invalid state index {branchId}"
-          | .some branch => pure $ target.continue branch
+          | .some branch => pure $ goalContinue target branch
         | .none, .some goals =>
           pure $ goalResume target goals
         | _, _ => return .error <| errorI "arguments" "Exactly one of {branch, goals} must be supplied"

Pantograph/Environment.lean

@@ -98,13 +98,13 @@ def inspect (args: Protocol.EnvInspect) (options: @&Protocol.Options): CoreM (Pr
 def addDecl (args: Protocol.EnvAdd): CoreM (Protocol.CR Protocol.EnvAddResult) := do
   let env ← Lean.MonadEnv.getEnv
   let tvM: Elab.TermElabM (Except String (Expr × Expr)) := do
-    let type ← match syntax_from_str env args.type with
+    let type ← match parseTerm env args.type with
       | .ok syn => do
-        match ← syntax_to_expr syn with
+        match ← elabTerm syn with
         | .error e => return .error e
         | .ok expr => pure expr
       | .error e => return .error e
-    let value ← match syntax_from_str env args.value with
+    let value ← match parseTerm env args.value with
       | .ok syn => do
         try
           let expr ← Elab.Term.elabTerm (stx := syn) (expectedType? := .some type)

Pantograph/Library.lean

@@ -109,21 +109,34 @@ def envAdd (name: String) (type: String) (value: String) (isTheorem: Bool):
     Lean.CoreM (Protocol.CR Protocol.EnvAddResult) :=
   Environment.addDecl { name, type, value, isTheorem }
 
-/-- This must be a TermElabM since the parsed expr contains extra information -/
+def parseElabType (type: String): Lean.Elab.TermElabM (Protocol.CR Lean.Expr) := do
-def exprParse (s: String): Lean.Elab.TermElabM (Protocol.CR Lean.Expr) := do
   let env ← Lean.MonadEnv.getEnv
-  let syn ← match syntax_from_str env s with
+  let syn ← match parseTerm env type with
     | .error str => return .error $ errorI "parsing" str
     | .ok syn => pure syn
-  match ← syntax_to_expr syn with
+  match ← elabType syn with
+  | .error str => return .error $ errorI "elab" str
+  | .ok expr => return .ok expr
+
+/-- This must be a TermElabM since the parsed expr contains extra information -/
+def parseElabExpr (expr: String) (expectedType?: Option String := .none): Lean.Elab.TermElabM (Protocol.CR Lean.Expr) := do
+  let env ← Lean.MonadEnv.getEnv
+  let expectedType? ← match ← expectedType?.mapM parseElabType with
+    | .none => pure $ .none
+    | .some (.ok t) => pure $ .some t
+    | .some (.error e) => return .error e
+  let syn ← match parseTerm env expr with
+    | .error str => return .error $ errorI "parsing" str
+    | .ok syn => pure syn
+  match ← elabTerm syn expectedType? with
   | .error str => return .error $ errorI "elab" str
   | .ok expr => return .ok expr
 
 @[export pantograph_expr_echo_m]
-def exprEcho (expr: String) (options: @&Protocol.Options):
+def exprEcho (expr: String) (expectedType?: Option String := .none) (options: @&Protocol.Options):
     Lean.CoreM (Protocol.CR Protocol.ExprEchoResult) := do
   let termElabM: Lean.Elab.TermElabM _ := do
-    let expr ← match ← exprParse expr with
+    let expr ← match ← parseElabExpr expr expectedType? with
       | .error e => return .error e
       | .ok expr => pure expr
     try
@@ -139,7 +152,7 @@ def exprEcho (expr: String) (options: @&Protocol.Options):
 @[export pantograph_goal_start_expr_m]
 def goalStartExpr (expr: String): Lean.CoreM (Protocol.CR GoalState) :=
   let termElabM: Lean.Elab.TermElabM _ := do
-    let expr ← match ← exprParse expr with
+    let expr ← match ← parseElabType expr with
       | .error e => return .error e
       | .ok expr => pure $ expr
     return .ok $ ← GoalState.create expr

Pantograph/Protocol.lean

@@ -98,6 +98,7 @@ structure StatResult where
 -- Return the type of an expression
 structure ExprEcho where
   expr: String
+  type?: Option String
   deriving Lean.FromJson
 structure ExprEchoResult where
   expr: Expression

Pantograph/Serial.lean

@@ -21,23 +21,22 @@ def unfoldAuxLemmas (e : Lean.Expr) : Lean.CoreM Lean.Expr := do
 --- Input Functions ---
 
 /-- Read syntax object from string -/
-def syntax_from_str (env: Environment) (s: String): Except String Syntax :=
+def parseTerm (env: Environment) (s: String): Except String Syntax :=
   Parser.runParserCategory
     (env := env)
     (catName := `term)
     (input := s)
     (fileName := "<stdin>")
 
-
 /-- Parse a syntax object. May generate additional metavariables! -/
-def syntax_to_expr_type (syn: Syntax): Elab.TermElabM (Except String Expr) := do
+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 syntax_to_expr (syn: Syntax): Elab.TermElabM (Except String Expr) := do
+def elabTerm (syn: Syntax) (expectedType? : Option Expr := .none): Elab.TermElabM (Except String Expr) := do
   try
-    let expr ← Elab.Term.elabTerm (stx := syn) (expectedType? := .none)
+    let expr ← Elab.Term.elabTerm (stx := syn) expectedType?
     return .ok expr
   catch ex => return .error (← ex.toMessageData.toString)
 

README.md

@@ -72,7 +72,7 @@ where the application of `assumption` should lead to a failure.
 
 See `Pantograph/Protocol.lean` for a description of the parameters and return values in JSON.
 - `reset`: Delete all cached expressions and proof trees
-- `expr.echo {"expr": <expr>}`: Determine the type of an expression and round-trip it
+- `expr.echo {"expr": <expr>, "type": <optional expected type>}`: Determine the type of an expression and round-trip it
 - `env.catalog`: Display a list of all safe Lean symbols in the current environment
 - `env.inspect {"name": <name>, "value": <bool>}`: Show the type and package of a
   given symbol; If value flag is set, the value is printed or hidden. By default

Test/Common.lean

@@ -24,6 +24,9 @@ def Goal.devolatilize (goal: Goal): Goal :=
 deriving instance DecidableEq, Repr for Expression
 deriving instance DecidableEq, Repr for Variable
 deriving instance DecidableEq, Repr for Goal
+deriving instance DecidableEq, Repr for ExprEchoResult
+deriving instance DecidableEq, Repr for InteractionError
+deriving instance DecidableEq, Repr for Option
 end Protocol
 
 def TacticResult.toString : TacticResult → String
@@ -38,8 +41,8 @@ def assertUnreachable (message: String): LSpec.TestSeq := LSpec.check message fa
 
 open Lean
 
-def runCoreMSeq (env: Environment) (coreM: CoreM LSpec.TestSeq): IO LSpec.TestSeq := do
+def runCoreMSeq (env: Environment) (coreM: CoreM LSpec.TestSeq) (options: Array String := #[]): IO LSpec.TestSeq := do
-  let coreContext: Core.Context ← createCoreContext #[]
+  let coreContext: Core.Context ← createCoreContext options
   match ← (coreM.run' coreContext { env := env }).toBaseIO with
   | .error exception =>
     return LSpec.test "Exception" (s!"internal exception #{← exception.toMessageData.toString}" = "")

Test/Integration.lean

@@ -73,22 +73,22 @@ def test_malformed_command : IO LSpec.TestSeq :=
   ]
 def test_tactic : IO LSpec.TestSeq :=
   let goal1: Protocol.Goal := {
-    name := "_uniq.10",
+    name := "_uniq.11",
     target := { pp? := .some "∀ (q : Prop), x ∨ q → q ∨ x" },
-    vars := #[{ name := "_uniq.9", userName := "x", isInaccessible? := .some false, type? := .some { pp? := .some "Prop" }}],
+    vars := #[{ name := "_uniq.10", userName := "x", isInaccessible? := .some false, type? := .some { pp? := .some "Prop" }}],
   }
   let goal2: Protocol.Goal := {
-    name := "_uniq.13",
+    name := "_uniq.14",
     target := { pp? := .some "x ∨ y → y ∨ x" },
     vars := #[
-      { name := "_uniq.9", userName := "x", isInaccessible? := .some false, type? := .some { pp? := .some "Prop" }},
+      { name := "_uniq.10", userName := "x", isInaccessible? := .some false, type? := .some { pp? := .some "Prop" }},
-      { name := "_uniq.12", userName := "y", isInaccessible? := .some false, type? := .some { pp? := .some "Prop" }}
+      { name := "_uniq.13", userName := "y", isInaccessible? := .some false, type? := .some { pp? := .some "Prop" }}
     ],
   }
   subroutine_runner [
     subroutine_step "goal.start"
       [("expr", .str "∀ (p q: Prop), p ∨ q → q ∨ p")]
-     (Lean.toJson ({stateId := 0, root := "_uniq.8"}:
+     (Lean.toJson ({stateId := 0, root := "_uniq.9"}:
       Protocol.GoalStartResult)),
     subroutine_step "goal.tactic"
       [("stateId", .num 0), ("goalId", .num 0), ("tactic", .str "intro x")]
@@ -100,7 +100,7 @@ def test_tactic : IO LSpec.TestSeq :=
     subroutine_step "goal.print"
       [("stateId", .num 1)]
      (Lean.toJson ({
-       parent? := .some { pp? := .some "fun x => ?m.11 x" },
+       parent? := .some { pp? := .some "fun x => ?m.12 x" },
      }:
       Protocol.GoalPrintResult)),
     subroutine_step "goal.tactic"

Test/Library.lean

@@ -0,0 +1,35 @@
+import LSpec
+import Lean
+import Pantograph.Library
+import Test.Common
+
+open Lean
+open Pantograph
+
+namespace Pantograph.Test.Library
+
+def test_expr_echo: IO LSpec.TestSeq := do
+  let env: Environment ← importModules
+    (imports := #[`Init])
+    (opts := {})
+    (trustLevel := 1)
+  let inner: CoreM LSpec.TestSeq := do
+    let prop_and_proof := "⟨∀ (x: Prop), x → x, λ (x: Prop) (h: x) => h⟩"
+    let tests := LSpec.TestSeq.done
+    let echoResult ← exprEcho prop_and_proof (options := {})
+    let tests := tests.append (LSpec.test "fail" (echoResult.toOption == .some {
+      type := { pp? := "?m.2" }, expr := { pp? := "?m.3" }
+    }))
+    let echoResult ← exprEcho prop_and_proof (expectedType? := .some "Σ' p:Prop, p") (options := {})
+    let tests := tests.append (LSpec.test "fail" (echoResult.toOption == .some {
+      type := { pp? := "(p : Prop) ×' p" }, expr := { pp? := "⟨∀ (x : Prop), x → x, fun x h => h⟩" }
+    }))
+    return tests
+  runCoreMSeq env (options := #["pp.proofs.threshold=100"]) inner
+
+def suite: IO LSpec.TestSeq := do
+
+  return LSpec.group "Library" $
+    (LSpec.group "ExprEcho" (← test_expr_echo))
+
+end Pantograph.Test.Library

Test/Main.lean

@@ -1,7 +1,8 @@
 import LSpec
 import Test.Environment
-import Test.Metavar
 import Test.Integration
+import Test.Library
+import Test.Metavar
 import Test.Proofs
 import Test.Serial
 
@@ -11,11 +12,12 @@ def main := do
   Lean.initSearchPath (← Lean.findSysroot)
 
   let suites := [
-    Metavar.suite,
+    Environment.suite,
     Integration.suite,
+    Library.suite,
+    Metavar.suite,
     Proofs.suite,
     Serial.suite,
-    Environment.suite
   ]
   let all ← suites.foldlM (λ acc m => do pure $ acc ++ (← m)) LSpec.TestSeq.done
   LSpec.lspecIO $ all

Test/Metavar.lean

@@ -17,12 +17,12 @@ def addTest (test: LSpec.TestSeq): TestM Unit := do
 def test_instantiate_mvar: TestM Unit := do
   let env ← Lean.MonadEnv.getEnv
   let value := "@Nat.le_trans 2 2 5 (@of_eq_true (@LE.le Nat instLENat 2 2) (@eq_true (@LE.le Nat instLENat 2 2) (@Nat.le_refl 2))) (@of_eq_true (@LE.le Nat instLENat 2 5) (@eq_true_of_decide (@LE.le Nat instLENat 2 5) (@Nat.decLe 2 5) (@Eq.refl Bool Bool.true)))"
-  let syn ← match syntax_from_str env value with
+  let syn ← match parseTerm env value with
     | .ok s => pure $ s
     | .error e => do
       addTest $ assertUnreachable e
       return ()
-  let expr ← match ← syntax_to_expr syn with
+  let expr ← match ← elabTerm syn with
     | .ok expr => pure $ expr
     | .error e => do
       addTest $ assertUnreachable e
@@ -36,14 +36,14 @@ def test_instantiate_mvar: TestM Unit := do
 
 def startProof (expr: String): TestM (Option GoalState) := do
   let env ← Lean.MonadEnv.getEnv
-  let syn? := syntax_from_str env expr
+  let syn? := parseTerm env expr
   addTest $ LSpec.check s!"Parsing {expr}" (syn?.isOk)
   match syn? with
   | .error error =>
     IO.println error
     return Option.none
   | .ok syn =>
-    let expr? ← syntax_to_expr_type syn
+    let expr? ← elabType syn
     addTest $ LSpec.check s!"Elaborating" expr?.isOk
     match expr? with
     | .error error =>

Test/Proofs.lean

@@ -32,14 +32,14 @@ def startProof (start: Start): TestM (Option GoalState) := do
     | .none =>
       return Option.none
   | .expr expr =>
-    let syn? := syntax_from_str env expr
+    let syn? := parseTerm env expr
     addTest $ LSpec.check s!"Parsing {expr}" (syn?.isOk)
     match syn? with
     | .error error =>
       IO.println error
       return Option.none
     | .ok syn =>
-      let expr? ← syntax_to_expr_type syn
+      let expr? ← elabType syn
       addTest $ LSpec.check s!"Elaborating" expr?.isOk
       match expr? with
       | .error error =>

Test/Serial.lean

@@ -55,8 +55,8 @@ def test_sexp_of_expr (env: Environment): IO LSpec.TestSeq := do
   ]
   let termElabM: Elab.TermElabM LSpec.TestSeq := entries.foldlM (λ suites (source, target) => do
     let env ← MonadEnv.getEnv
-    let s := syntax_from_str env source |>.toOption |>.get!
+    let s := parseTerm env source |>.toOption |>.get!
-    let expr := (← syntax_to_expr s) |>.toOption |>.get!
+    let expr := (← elabTerm s) |>.toOption |>.get!
     let test := LSpec.check source ((← serialize_expression_ast expr) = target)
     return LSpec.TestSeq.append suites test) LSpec.TestSeq.done
   let metaM := termElabM.run' (ctx := defaultTermElabMContext)
@@ -67,8 +67,8 @@ def test_instance (env: Environment): IO LSpec.TestSeq := do
   let metaM: MetaM LSpec.TestSeq := do
     let env ← MonadEnv.getEnv
     let source := "λ x y: Nat => HAdd.hAdd Nat Nat Nat (instHAdd Nat instAddNat) x y"
-    let s := syntax_from_str env source |>.toOption |>.get!
+    let s := parseTerm env source |>.toOption |>.get!
-    let _expr := (← runTermElabMInMeta <| syntax_to_expr s) |>.toOption |>.get!
+    let _expr := (← runTermElabMInMeta <| elabTerm s) |>.toOption |>.get!
     return LSpec.TestSeq.done
   runMetaMSeq env metaM