238 lines
8.6 KiB
Plaintext
238 lines
8.6 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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coreContext: Lean.Core.Context
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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 IO)
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def nextId (s: State): Nat := s.environments.size
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def State.getEnv (state: State) (id: Nat): Except String Lean.Environment :=
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match state.environments.get? id with
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| .some env => return env
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| .none => throw s!"Invalid environment id {id}"
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-- Utilities
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def option_expect (o: Option α) (error: String): Except String α :=
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match o with
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| .some value => return value
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| .none => throw error
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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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unsafe def execute (command: Command): Subroutine Lean.Json := do
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match command.cmd with
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| "create" =>
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match Lean.fromJson? command.payload with
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| .ok args => create args
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| .error x => return errorJson x
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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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| "clear" =>
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-- Delete all the environments
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let ret ← clear
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return Lean.toJson ret
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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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create (args: Create): Subroutine Lean.Json := do
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let state ← get
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let id := nextId state
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let env ← Lean.importModules
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(imports := args.imports.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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modify fun s => { environments := s.environments.push env }
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let num_filtered_symbols := env.constants.fold (init := 0) (λ acc name info =>
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acc + if is_symbol_unsafe_or_internal name info then 0 else 1)
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return Lean.toJson ({
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id := id,
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symbols := env.constants.size,
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filtered_symbols := num_filtered_symbols }: CreateResult)
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catalog (args: Catalog): Subroutine Lean.Json := do
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let state ← get
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match state.getEnv args.id with
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| .error error => return Lean.toJson <| errorIndex error
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| .ok env =>
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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 <| ({ theorems := names }: CatalogResult)
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clear: Subroutine Lean.Json := do
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let state ← get
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let nEnv := state.environments.size
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for env in state.environments do
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env.freeRegions
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set ({ }: State)
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return Lean.toJson ({ nEnv := nEnv }: ClearResult)
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inspect (args: Inspect): Subroutine Lean.Json := do
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let context ← read
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let state ← get
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match state.getEnv args.id with
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| .error error => return Lean.toJson <| errorIndex error
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| .ok env =>
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let info? := env.find? <| str_to_name args.symbol
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match info? with
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| none => return Lean.toJson <| errorIndex s!"Symbol not found {args.symbol}"
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| some info =>
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let format ← Serial.expr_to_str
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(env := env)
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(coreContext := context.coreContext)
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(expr := info.toConstantVal.type)
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return Lean.toJson ({ type := format }: InspectResult)
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proof_start (args: ProofStart): Subroutine Lean.Json := do
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let context ← read
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let state ← get
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let ret?: Except Lean.Json Meta.ProofTree ← ExceptT.run <| (do
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let env ← match state.getEnv args.id with
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| .error error => throw <| Lean.toJson <| errorIndex error
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| .ok env => pure env
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let tree := Meta.createProofTree
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(name := args.name.getD "Untitled")
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(env := env)
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(coreContext := context.coreContext)
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let expr: Lean.Expr ← match args.expr, args.copyFrom with
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| .none, .none =>
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throw <| Lean.toJson ({ error := "arguments", desc := "At least one of {expr, copyFrom} must be supplied" }: InteractionError)
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| .some expr, .none =>
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let syn ← match Serial.syntax_from_str env expr with
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| .error str => throw <| Lean.toJson ({ error := "parsing", desc := str }: InteractionError)
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| .ok syn => pure syn
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let expr: Lean.Expr ← match (← Meta.ProofM.syntax_to_expr syn |>.run' tree) with
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| .error str => throw <| Lean.toJson ({ error := "elab", desc := str }: InteractionError)
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| .ok expr => pure expr
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pure expr
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| .none, .some copyFrom =>
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match Serial.expr_from_const env (name := str_to_name copyFrom) with
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| .error str =>
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IO.println "Symbol not found"
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throw <| errorIndex str
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| .ok expr => pure expr
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| _, _ => throw <| Lean.toJson ({ error := "arguments", desc := "Cannot populate both of {expr, copyFrom}" }: InteractionError)
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let (_, tree) := ← (Meta.ProofM.start expr |>.run tree)
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return tree
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)
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match ret? with
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| .error error => return error
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| .ok tree =>
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-- Put the new tree in the environment
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let nextId := state.proofTrees.size
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set { state with proofTrees := state.proofTrees.push tree }
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return Lean.toJson ({ treeId := nextId }: 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.ProofM.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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let parents := tree.states.map λ state => match state.parent with
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| .none => ""
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| .some parent => s!"{parent}.{state.parentGoalId}"
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return Lean.toJson ({parents := parents}: 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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match parse_command command with
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| .error _ =>
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-- Halt execution if command is empty
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return ()
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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 : IO Unit := do
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Lean.enableInitializersExecution
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Lean.initSearchPath (← Lean.findSysroot)
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let context: Context := {
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coreContext := {
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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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}
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try
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loop.run context |>.run' {}
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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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