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 Subroutine := ReaderT Context (StateT State Lean.Elab.TermElabM) /-- Parse a command either in `{ "cmd": ..., "payload": ... }` form or `cmd { ... }` form. -/ def parse_command (s: String): Except String Commands.Command := do let s := s.trim match s.get? 0 with | .some '{' => -- Parse in Json mode Lean.fromJson? (← Lean.Json.parse s) | .some _ => -- Parse in line mode let offset := s.posOf ' ' |> s.offsetOfPos if offset = s.length then return { cmd := s.take offset, payload := Lean.Json.null } else let payload ← s.drop offset |> Lean.Json.parse return { cmd := s.take offset, payload := payload } | .none => throw "Command is empty" def execute (command: Commands.Command): Subroutine Lean.Json := do match command.cmd with | "options.set" => match Lean.fromJson? command.payload with | .ok args => options_set args | .error x => return errorJson x | "options.print" => match Lean.fromJson? command.payload with | .ok args => options_print args | .error x => return errorJson x | "catalog" => match Lean.fromJson? command.payload with | .ok args => catalog args | .error x => return errorJson x | "inspect" => match Lean.fromJson? command.payload with | .ok args => inspect args | .error x => return errorJson x | "clear" => clear | "expr.echo" => match Lean.fromJson? command.payload with | .ok args => expr_echo args | .error x => return errorJson x | "proof.start" => match Lean.fromJson? command.payload with | .ok args => proof_start args | .error x => return errorJson x | "proof.tactic" => match Lean.fromJson? command.payload with | .ok args => proof_tactic args | .error x => return errorJson x | "proof.printTree" => match Lean.fromJson? command.payload with | .ok args => proof_print_tree args | .error x => return errorJson x | cmd => let error: Commands.InteractionError := { error := "unknown", desc := s!"Unknown command {cmd}" } return Lean.toJson error where errorI (type desc: String) := Lean.toJson ( { error := type, desc := desc }: Commands.InteractionError) errorJson := errorI "json" errorIndex := errorI "index" -- Command Functions options_set (args: Commands.OptionsSet): Subroutine Lean.Json := do let state ← get set { state with options := { printExprPretty := args.printExprPretty?.getD true, printExprAST := args.printExprAST?.getD true, proofVariableDelta := args.proofVariableDelta?.getD false } } return Lean.toJson ({ }: Commands.OptionsSetResult) options_print (_: Commands.OptionsPrint): Subroutine Lean.Json := do return Lean.toJson (← get).options catalog (_: Commands.Catalog): Subroutine Lean.Json := 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 Lean.toJson <| ({ symbols := names }: Commands.CatalogResult) inspect (args: Commands.Inspect): Subroutine Lean.Json := 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 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 Lean.toJson ({ type := ← serialize_expression state.options info.type, value? := ← value?.mapM (λ v => serialize_expression state.options v), module? := module? }: Commands.InspectResult) clear : Subroutine Lean.Json := do let state ← get let nTrees := state.proofTrees.size set { state with proofTrees := #[] } return Lean.toJson ({ nTrees := nTrees }: Commands.ClearResult) expr_echo (args: Commands.ExprEcho): Subroutine Lean.Json := do let state ← get let env ← Lean.MonadEnv.getEnv match syntax_from_str env args.expr with | .error str => return errorI "parsing" str | .ok syn => do match (← syntax_to_expr syn) with | .error str => return errorI "elab" str | .ok expr => do try let type ← Lean.Meta.inferType expr return Lean.toJson <| ({ type := (← serialize_expression (options := state.options) type), expr := (← serialize_expression (options := state.options) expr) }: Commands.ExprEchoResult) catch exception => return errorI "typing" (← exception.toMessageData.toString) proof_start (args: Commands.ProofStart): Subroutine Lean.Json := do let state ← get let env ← Lean.MonadEnv.getEnv let expr?: Except Lean.Json 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 | .ok expr => let tree ← ProofTree.create (str_to_name <| args.name.getD "Untitled") expr -- Put the new tree in the environment let nextTreeId := state.proofTrees.size set { state with proofTrees := state.proofTrees.push tree } return Lean.toJson ({ treeId := nextTreeId }: Commands.ProofStartResult) proof_tactic (args: Commands.ProofTactic): Subroutine Lean.Json := do let state ← get match state.proofTrees.get? args.treeId with | .none => return 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 Lean.toJson <| errorIndex message | .success nextId? goals => set { state with proofTrees := state.proofTrees.set! args.treeId nextTree } return Lean.toJson ( { nextId? := nextId?, goals := goals }: Commands.ProofTacticResultSuccess) | .failure messages => return Lean.toJson ( { tacticErrors := messages }: Commands.ProofTacticResultFailure) proof_print_tree (args: Commands.ProofPrintTree): Subroutine Lean.Json := do let state ← get match state.proofTrees.get? args.treeId with | .none => return errorIndex "Invalid tree index {args.treeId}" | .some tree => return Lean.toJson ({parents := tree.structure_array}: Commands.ProofPrintTreeResult) end Pantograph