import Pantograph.Goal import Pantograph.Protocol import Pantograph.Serial import Pantograph.Symbol import Lean.Data.HashMap namespace Pantograph structure Context where imports: List String /-- Stores state of the REPL -/ structure State where options: Protocol.Options := {} nextId: Nat := 0 goalStates: Lean.HashMap Nat GoalState := Lean.HashMap.empty /-- Main state monad for executing commands -/ abbrev MainM := ReaderT Context (StateT State Lean.Elab.TermElabM) -- HACK: For some reason writing `CommandM α := MainM (Except ... α)` disables -- certain monadic features in `MainM` abbrev CR α := Except Protocol.InteractionError α 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 := match Lean.fromJson? command.payload with | .ok args => do match (← comm args) with | .ok result => return Lean.toJson result | .error ierror => return Lean.toJson ierror | .error error => return Lean.toJson $ errorCommand s!"Unable to parse json: {error}" match command.cmd with | "reset" => run reset | "stat" => run stat | "expr.echo" => run expr_echo | "lib.catalog" => run lib_catalog | "lib.inspect" => run lib_inspect | "options.set" => run options_set | "options.print" => run options_print | "goal.start" => run goal_start | "goal.tactic" => run goal_tactic | "goal.continue" => run goal_continue | "goal.delete" => run goal_delete | "goal.print" => run goal_print | cmd => let error: Protocol.InteractionError := errorCommand s!"Unknown command {cmd}" return Lean.toJson error where errorI (type desc: String): Protocol.InteractionError := { error := type, desc := desc } errorCommand := errorI "command" errorIndex := errorI "index" -- Command Functions reset (_: Protocol.Reset): MainM (CR Protocol.StatResult) := do let state ← get let nGoals := state.goalStates.size set { state with nextId := 0, goalStates := Lean.HashMap.empty } return .ok { nGoals } stat (_: Protocol.Stat): MainM (CR Protocol.StatResult) := do let state ← get let nGoals := state.goalStates.size return .ok { nGoals } lib_catalog (_: Protocol.LibCatalog): MainM (CR Protocol.LibCatalogResult) := do let env ← Lean.MonadEnv.getEnv let names := env.constants.fold (init := #[]) (λ acc name info => match to_filtered_symbol name info with | .some x => acc.push x | .none => acc) return .ok { symbols := names } lib_inspect (args: Protocol.LibInspect): MainM (CR Protocol.LibInspectResult) := do let state ← get let env ← Lean.MonadEnv.getEnv let name := args.name.toName let info? := env.find? name match info? with | none => return .error $ errorIndex s!"Symbol not found {args.name}" | some info => let module? := env.getModuleIdxFor? name >>= (λ idx => env.allImportedModuleNames.get? idx.toNat) |>.map toString let value? := match args.value?, info with | .some true, _ => info.value? | .some false, _ => .none | .none, .defnInfo _ => info.value? | .none, _ => .none return .ok { type := ← serialize_expression state.options info.type, value? := ← value?.mapM (λ v => serialize_expression state.options v), publicName? := Lean.privateToUserName? name |>.map (·.toString), typeDependency? := if args.dependency?.getD false then .some <| info.type.getUsedConstants.map (λ n => name_to_ast n) else .none, valueDependency? := if args.dependency?.getD false then info.value?.map (·.getUsedConstants.map (λ n => name_to_ast n)) else .none, module? := module? } expr_echo (args: Protocol.ExprEcho): MainM (CR Protocol.ExprEchoResult) := do let state ← get let env ← Lean.MonadEnv.getEnv match syntax_from_str env args.expr with | .error str => return .error $ errorI "parsing" str | .ok syn => do match (← syntax_to_expr syn) with | .error str => return .error $ errorI "elab" str | .ok expr => do try let type ← Lean.Meta.inferType expr return .ok { type := (← serialize_expression (options := state.options) type), expr := (← serialize_expression (options := state.options) expr) } catch exception => return .error $ errorI "typing" (← exception.toMessageData.toString) options_set (args: Protocol.OptionsSet): MainM (CR Protocol.OptionsSetResult) := do let state ← get let options := state.options set { state with options := { -- FIXME: This should be replaced with something more elegant printJsonPretty := args.printJsonPretty?.getD options.printJsonPretty, printExprPretty := args.printExprPretty?.getD options.printExprPretty, printExprAST := args.printExprAST?.getD options.printExprAST, noRepeat := args.noRepeat?.getD options.noRepeat, printAuxDecls := args.printAuxDecls?.getD options.printAuxDecls, printImplementationDetailHyps := args.printImplementationDetailHyps?.getD options.printImplementationDetailHyps } } return .ok { } options_print (_: Protocol.OptionsPrint): MainM (CR Protocol.OptionsPrintResult) := do return .ok (← get).options goal_start (args: Protocol.GoalStart): MainM (CR Protocol.GoalStartResult) := do let state ← get let env ← Lean.MonadEnv.getEnv let expr?: Except _ Lean.Expr ← (match args.expr, args.copyFrom with | .some expr, .none => (match syntax_from_str env expr with | .error str => return .error <| errorI "parsing" str | .ok syn => do (match (← syntax_to_expr syn) with | .error str => return .error <| errorI "elab" str | .ok expr => return .ok expr)) | .none, .some copyFrom => (match env.find? <| copyFrom.toName with | .none => return .error <| errorIndex s!"Symbol not found: {copyFrom}" | .some cInfo => return .ok cInfo.type) | _, _ => return .error <| errorI "arguments" "Exactly one of {expr, copyFrom} must be supplied") match expr? with | .error error => return .error error | .ok expr => let goalState ← GoalState.create expr let stateId := state.nextId set { state with goalStates := state.goalStates.insert stateId goalState, nextId := state.nextId + 1 } return .ok { stateId, root := goalState.root.name.toString } goal_tactic (args: Protocol.GoalTactic): MainM (CR Protocol.GoalTacticResult) := do let state ← get match state.goalStates.find? args.stateId with | .none => return .error $ errorIndex s!"Invalid state index {args.stateId}" | .some goalState => do let nextGoalState?: Except _ GoalState ← match args.tactic?, args.expr? with | .some tactic, .none => do pure ( Except.ok (← GoalState.execute goalState args.goalId tactic)) | .none, .some expr => do pure ( Except.ok (← GoalState.tryAssign goalState args.goalId expr)) | _, _ => pure (Except.error <| errorI "arguments" "Exactly one of {tactic, expr} must be supplied") match nextGoalState? with | .error error => return .error error | .ok (.success nextGoalState) => let nextStateId := state.nextId set { state with goalStates := state.goalStates.insert state.nextId nextGoalState, nextId := state.nextId + 1, } let goals ← nextGoalState.serializeGoals (parent := .some goalState) (options := state.options) return .ok { nextStateId? := .some nextStateId, goals? := .some goals, } | .ok (.parseError message) => return .ok { parseError? := .some message } | .ok (.indexError goalId) => return .error $ errorIndex s!"Invalid goal id index {goalId}" | .ok (.failure messages) => return .ok { tacticErrors? := .some messages } goal_continue (args: Protocol.GoalContinue): MainM (CR Protocol.GoalContinueResult) := do let state ← get match state.goalStates.find? args.target with | .none => return .error $ errorIndex s!"Invalid state index {args.target}" | .some target => do let nextState? ← match args.branch?, args.goals? with | .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 | .none, .some goals => let goals := goals.map (λ name => { name := name.toName }) pure $ target.resume goals | _, _ => return .error <| errorI "arguments" "Exactly one of {branch, goals} must be supplied" match nextState? with | .error error => return .error <| errorI "structure" error | .ok nextGoalState => let nextStateId := state.nextId set { state with goalStates := state.goalStates.insert nextStateId nextGoalState, nextId := state.nextId + 1 } let goals ← nextGoalState.serializeGoals (parent := .none) (options := state.options) return .ok { nextStateId, goals, } goal_delete (args: Protocol.GoalDelete): MainM (CR Protocol.GoalDeleteResult) := do let state ← get let goalStates := args.stateIds.foldl (λ map id => map.erase id) state.goalStates set { state with goalStates } return .ok {} goal_print (args: Protocol.GoalPrint): MainM (CR Protocol.GoalPrintResult) := do let state ← get match state.goalStates.find? args.stateId with | .none => return .error $ errorIndex s!"Invalid state index {args.stateId}" | .some goalState => do let root? ← goalState.rootExpr?.mapM (λ expr => serialize_expression state.options expr) return .ok { root?, } end Pantograph