59 lines
1.4 KiB
Plaintext
59 lines
1.4 KiB
Plaintext
import Lean.Data.Json
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import Pantograph.Commands
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namespace Pantograph
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structure State where
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environments: Array String
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-- State monad
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abbrev T (m: Type → Type) := StateT State m
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abbrev Subroutine := T (Except String) Lean.Json
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structure Command where
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cmd: String
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payload: Lean.Json
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deriving Lean.FromJson
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--def create_environment (args: Create): Subroutine := do
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-- let state ← get
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end Pantograph
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open Pantograph
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def execute (command: String): T (ExceptT String IO) Lean.Json := do
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let state ← get
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let obj ← Lean.Json.parse command
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let command: Command ← Lean.fromJson? obj
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match command.cmd with
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| "create" =>
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let create: Commands.Create ← Lean.fromJson? command.payload
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return Lean.toJson create.imports
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| "catalog" =>
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let catalog: Commands.Catalog ← Lean.fromJson? command.payload
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return "catalog stub"
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| cmd => throw s!"Unknown verb: {cmd}"
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-- Main IO functions
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unsafe def getLines : IO String := do
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match (← (← IO.getStdin).getLine) with
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| "" => pure ""
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| "\n" => pure "\n"
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| line => pure <| line ++ (← getLines)
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unsafe def loop : T IO Unit := do
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let state ← get
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let command ← getLines
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if command == "" then return ()
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let ret ← execute command
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match ret with
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| .error e => IO.println s!"Could not parse json: {e}"
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| .ok obj => IO.println <| toString <| obj
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unsafe def main : IO Unit :=
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StateT.run' loop ⟨#[]⟩
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