import Pantograph.Goal import Pantograph.Protocol import Pantograph.SemihashMap import Pantograph.Serial import Pantograph.Symbol namespace Pantograph structure Context where imports: List String /-- Stores state of the REPL -/ structure State where options: Protocol.Options := {} goalStates: SemihashMap GoalState := SemihashMap.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.delete" => run goal_delete | 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 goalStates := SemihashMap.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 := str_to_name args.name 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), 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? <| str_to_name copyFrom with | .none => return .error <| errorIndex s!"Symbol not found: {copyFrom}" | .some cInfo => return .ok cInfo.type) | .none, .none => return .error <| errorI "arguments" "At least one of {expr, copyFrom} must be supplied" | _, _ => return .error <| errorI "arguments" "Cannot populate both of {expr, copyFrom}") match expr? with | .error error => return .error error | .ok expr => let goalState ← GoalState.create expr let (goalStates, stateId) := state.goalStates.insert goalState set { state with goalStates } return .ok { stateId } goal_tactic (args: Protocol.GoalTactic): MainM (CR Protocol.GoalTacticResult) := do let state ← get match state.goalStates.get? args.stateId with | .none => return .error $ errorIndex s!"Invalid state index {args.stateId}" | .some goalState => match ← GoalState.execute goalState args.goalId args.tactic with | .success nextGoalState => let (goalStates, nextStateId) := state.goalStates.insert nextGoalState set { state with goalStates } let goals ← nextGoalState.serializeGoals (parent := .some goalState) (options := state.options) return .ok { nextStateId? := .some nextStateId, goals? := .some goals, } | .parseError message => return .ok { parseError? := .some message } | .indexError goalId => return .error $ errorIndex s!"Invalid goal id index {goalId}" | .failure messages => return .ok { tacticErrors? := .some messages } goal_delete (args: Protocol.GoalDelete): MainM (CR Protocol.GoalDeleteResult) := do let state ← get let goalStates := args.stateIds.foldl (λ map id => map.remove id) state.goalStates set { state with goalStates } return .ok {} end Pantograph