185 lines
6.9 KiB
Plaintext
185 lines
6.9 KiB
Plaintext
import Lean.Data.Json
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import Lean.Environment
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import Pantograph.Commands
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import Pantograph.Serial
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import Pantograph.Meta
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import Pantograph.Symbols
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namespace Pantograph
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structure Context where
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/-- Stores state of the REPL -/
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structure State where
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--environments: Array Lean.Environment := #[]
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proofTrees: Array Meta.ProofTree := #[]
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-- State monad
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abbrev Subroutine := ReaderT Context (StateT State Lean.Elab.TermElabM)
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open Commands
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/-- Parse a command either in `{ "cmd": ..., "payload": ... }` form or `cmd { ... }` form. -/
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def parse_command (s: String): Except String Command := do
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let s := s.trim
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match s.get? 0 with
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| .some '{' => -- Parse in Json mode
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Lean.fromJson? (← Lean.Json.parse s)
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| .some _ => -- Parse in line mode
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let offset := s.posOf ' ' |> s.offsetOfPos
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if offset = s.length then
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return { cmd := s.take offset, payload := Lean.Json.null }
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else
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let payload ← s.drop offset |> Lean.Json.parse
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return { cmd := s.take offset, payload := payload }
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| .none => throw "Command is empty"
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def execute (command: Command): Subroutine Lean.Json := do
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match command.cmd with
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| "catalog" =>
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match Lean.fromJson? command.payload with
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| .ok args => catalog args
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| .error x => return errorJson x
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| "inspect" =>
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match Lean.fromJson? command.payload with
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| .ok args => inspect args
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| .error x => return errorJson x
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| "proof.start" =>
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match Lean.fromJson? command.payload with
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| .ok args => proof_start args
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| .error x => return errorJson x
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| "proof.tactic" =>
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match Lean.fromJson? command.payload with
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| .ok args => proof_tactic args
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| .error x => return errorJson x
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| "proof.printTree" =>
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match Lean.fromJson? command.payload with
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| .ok args => proof_print_tree args
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| .error x => return errorJson x
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| cmd =>
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let error: InteractionError := { error := "unknown", desc := s!"Unknown command {cmd}" }
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return Lean.toJson error
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where
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errorJson (s: String) := Lean.toJson ({ error := "json", desc := s }: InteractionError)
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errorIndex (s: String) := Lean.toJson ({ error := "index", desc := s }: InteractionError)
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catalog (_: Catalog): Subroutine Lean.Json := do
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let env ← Lean.MonadEnv.getEnv
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let names := env.constants.fold (init := []) (λ es name info =>
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match to_filtered_symbol name info with
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| .some x => x::es
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| .none => es)
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return Lean.toJson <| ({ symbols := names }: CatalogResult)
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inspect (args: Inspect): Subroutine Lean.Json := do
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let env ← Lean.MonadEnv.getEnv
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let name := str_to_name args.name
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let info? := env.find? name
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match info? with
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| none => return Lean.toJson <| errorIndex s!"Symbol not found {args.name}"
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| some info =>
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let format ← Lean.Meta.ppExpr info.toConstantVal.type
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let module? := env.getModuleIdxFor? name >>=
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(λ idx => env.allImportedModuleNames.get? idx.toNat) |>.map toString
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return Lean.toJson ({
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type := toString format,
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module? := module?
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}: InspectResult)
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proof_start (args: ProofStart): Subroutine Lean.Json := do
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let state ← get
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let env ← Lean.MonadEnv.getEnv
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let expr?: Except Lean.Json Lean.Expr ← (match args.expr, args.copyFrom with
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| .some expr, .none =>
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(match Serial.syntax_from_str env expr with
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| .error str => return .error <| Lean.toJson ({ error := "parsing", desc := str }: InteractionError)
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| .ok syn => do
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(match (← Meta.syntax_to_expr syn) with
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| .error str => return .error <| Lean.toJson ({ error := "elab", desc := str }: InteractionError)
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| .ok expr => return .ok expr))
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| .none, .some copyFrom =>
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(match env.find? <| str_to_name copyFrom with
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| .none => return .error <| errorIndex s!"Symbol not found: {copyFrom}"
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| .some cInfo => return .ok cInfo.type)
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| .none, .none =>
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return .error <| Lean.toJson ({ error := "arguments", desc := "At least one of {expr, copyFrom} must be supplied" }: InteractionError)
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| _, _ => return .error <| Lean.toJson ({ error := "arguments", desc := "Cannot populate both of {expr, copyFrom}" }: InteractionError))
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match expr? with
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| .error error => return error
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| .ok expr =>
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let tree ← Meta.ProofTree.create (str_to_name <| args.name.getD "Untitled") expr
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-- Put the new tree in the environment
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let nextTreeId := state.proofTrees.size
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set { state with proofTrees := state.proofTrees.push tree }
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return Lean.toJson ({ treeId := nextTreeId }: ProofStartResult)
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proof_tactic (args: ProofTactic): Subroutine Lean.Json := do
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let state ← get
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match state.proofTrees.get? args.treeId with
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| .none => return Lean.toJson <| errorIndex "Invalid tree index {args.treeId}"
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| .some tree =>
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let (result, nextTree) ← Meta.ProofTree.execute
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(stateId := args.stateId)
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(goalId := args.goalId.getD 0)
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(tactic := args.tactic) |>.run tree
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match result with
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| .invalid message => return Lean.toJson <| errorIndex message
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| .success nextId? goals =>
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set { state with proofTrees := state.proofTrees.set! args.treeId nextTree }
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return Lean.toJson ({ nextId? := nextId?, goals := goals }: ProofTacticResultSuccess)
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| .failure messages =>
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return Lean.toJson ({ errorMessages := messages }: ProofTacticResultFailure)
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proof_print_tree (args: ProofPrintTree): Subroutine Lean.Json := do
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let state ← get
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match state.proofTrees.get? args.treeId with
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| .none => return Lean.toJson <| errorIndex "Invalid tree index {args.treeId}"
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| .some tree =>
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return Lean.toJson ({parents := tree.structure_array}: ProofPrintTreeResult)
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end Pantograph
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-- Main IO functions
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open Pantograph
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unsafe def loop : Subroutine Unit := do
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let command ← (← IO.getStdin).getLine
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if command.trim.length = 0 then return ()
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match parse_command command with
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| .error error =>
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let error := Lean.toJson ({ error := "json", desc := error }: Commands.InteractionError)
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IO.println (toString error)
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| .ok command =>
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let ret ← execute command
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IO.println <| toString <| ret
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loop
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unsafe def main (args: List String): IO Unit := do
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Lean.enableInitializersExecution
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Lean.initSearchPath (← Lean.findSysroot)
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let env ← Lean.importModules
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(imports := args.map (λ str => { module := str_to_name str, runtimeOnly := false }))
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(opts := {})
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(trustLevel := 1)
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let context: Context := {
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}
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let coreContext: Lean.Core.Context := {
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currNamespace := str_to_name "Aniva",
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openDecls := [], -- No 'open' directives needed
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fileName := "<Pantograph>",
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fileMap := { source := "", positions := #[0], lines := #[1] }
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}
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try
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let termElabM := loop.run context |>.run' {}
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let metaM := termElabM.run' (ctx := {
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declName? := some "_pantograph",
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errToSorry := false
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})
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let coreM := metaM.run'
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discard <| coreM.toIO coreContext { env := env }
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catch ex =>
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IO.println "Uncaught IO exception"
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IO.println ex.toString
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