import Pantograph.Commands import Pantograph.Serial import Pantograph.Symbols import Pantograph.Tactic namespace Pantograph structure Context where imports: List String /-- Stores state of the REPL -/ structure State where options: Commands.Options := {} --environments: Array Lean.Environment := #[] proofTrees: Array ProofTree := #[] -- State monad abbrev MainM := ReaderT Context (StateT State Lean.Elab.TermElabM) -- For some reason writing `CommandM α := MainM (Except ... α)` disables certain -- monadic features in `MainM` abbrev CR α := Except Commands.InteractionError α def execute (command: Commands.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 | "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 | "proof.start" => run proof_start | "proof.tactic" => run proof_tactic | "proof.printTree" => run proof_print_tree | cmd => let error: Commands.InteractionError := errorCommand s!"Unknown command {cmd}" return Lean.toJson error where errorI (type desc: String): Commands.InteractionError := { error := type, desc := desc } errorCommand := errorI "command" errorIndex := errorI "index" -- Command Functions reset (_: Commands.Reset): MainM (CR Commands.ResetResult) := do let state ← get let nTrees := state.proofTrees.size set { state with proofTrees := #[] } return .ok { nTrees := nTrees } lib_catalog (_: Commands.LibCatalog): MainM (CR Commands.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: Commands.LibInspect): MainM (CR Commands.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: Commands.ExprEcho): MainM (CR Commands.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: Commands.OptionsSet): MainM (CR Commands.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, proofVariableDelta := args.proofVariableDelta?.getD options.proofVariableDelta, printAuxDecls := args.printAuxDecls?.getD options.printAuxDecls, printImplementationDetailHyps := args.printImplementationDetailHyps?.getD options.printImplementationDetailHyps } } return .ok { } options_print (_: Commands.OptionsPrint): MainM (CR Commands.OptionsPrintResult) := do return .ok (← get).options proof_start (args: Commands.ProofStart): MainM (CR Commands.ProofStartResult) := 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 tree ← ProofTree.create expr -- Put the new tree in the environment let nextTreeId := state.proofTrees.size set { state with proofTrees := state.proofTrees.push tree } return .ok { treeId := nextTreeId } proof_tactic (args: Commands.ProofTactic): MainM (CR Commands.ProofTacticResult) := do let state ← get match state.proofTrees.get? args.treeId with | .none => return .error $ errorIndex "Invalid tree index {args.treeId}" | .some tree => let (result, nextTree) ← ProofTree.execute (stateId := args.stateId) (goalId := args.goalId.getD 0) (tactic := args.tactic) |>.run state.options |>.run tree match result with | .invalid message => return .error $ errorIndex message | .success nextId? goals => set { state with proofTrees := state.proofTrees.set! args.treeId nextTree } return .ok { nextId? := nextId?, goals? := .some goals } | .failure messages => return .ok { tacticErrors? := .some messages } proof_print_tree (args: Commands.ProofPrintTree): MainM (CR Commands.ProofPrintTreeResult) := do let state ← get match state.proofTrees.get? args.treeId with | .none => return .error $ errorIndex "Invalid tree index {args.treeId}" | .some tree => return .ok { parents := tree.structure_array } end Pantograph