Pantograph/Main.lean

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import Lean.Data.Json
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import Lean.Environment
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import Pantograph.Commands
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namespace Pantograph
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-- Utilities
def option_expect (o: Option α) (error: String): Except String α :=
match o with
| .some value => return value
| .none => throw error
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structure State where
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environments: Array Lean.Environment
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-- State monad
abbrev T (m: Type → Type) := StateT State m
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abbrev Subroutine α := ExceptT String (T IO) α
def nextId (s: State): Nat := s.environments.size
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structure Command where
cmd: String
payload: Lean.Json
deriving Lean.FromJson
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namespace Commands
def create (args: Create): Subroutine CreateResult := do
let state ← get
let id := nextId state
let env ← Lean.importModules
(imports := args.imports.map strTransform)
(opts := {})
(trustLevel := 1)
modify fun s => { environments := s.environments.push env }
return { id := id }
where strTransform (s: String): Lean.Import :=
let li := s.split (λ c => c == '.')
let name := li.foldl (λ pre segment => Lean.Name.str pre segment) Lean.Name.anonymous
{ module := name, runtimeOnly := false }
def catalog (args: Catalog): Subroutine CatalogResult := do
let state ← get
match state.environments.get? args.id with
| .some env =>
let names := env.constants.toList.map (λ ⟨x, _⟩ => toString x)
return { theorems := names }
| .none => throw s!"Invalid environment id {args.id}"
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unsafe def clear: Subroutine ClearResult := do
let state ← get
for env in state.environments do
env.freeRegions
return { n := state.environments.size }
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end Commands
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end Pantograph
open Pantograph
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unsafe def execute (command: String): ExceptT String (T IO) Lean.Json := do
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let obj ← Lean.Json.parse command
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let command: Command ← Lean.fromJson? obj
match command.cmd with
| "create" =>
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let args: Commands.Create ← Lean.fromJson? command.payload
let ret ← Commands.create args
return Lean.toJson ret
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| "catalog" =>
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let args: Commands.Catalog ← Lean.fromJson? command.payload
let ret ← Commands.catalog args
return Lean.toJson ret
| "clear" =>
-- Delete all the environments
let ret ← Commands.clear
return Lean.toJson ret
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| cmd => throw s!"Unknown verb: {cmd}"
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-- Main IO functions
unsafe def getLines : IO String := do
match (← (← IO.getStdin).getLine) with
| "" => pure ""
| "\n" => pure "\n"
| line => pure <| line ++ (← getLines)
unsafe def loop : T IO Unit := do
let command ← getLines
if command == "" then return ()
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let ret ← execute command
match ret with
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| .error e => IO.println s!"Error: {e}"
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| .ok obj => IO.println <| toString <| obj
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loop
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unsafe def main : IO Unit :=
StateT.run' loop ⟨#[]⟩