106 lines
3.8 KiB
Text
106 lines
3.8 KiB
Text
/-
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Copyright (c) 2020 Microsoft Corporation. All rights reserved.
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Released under Apache 2.0 license as described in the file LICENSE.
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Authors: Leonardo de Moura
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-/
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import Init.System.IO
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import Init.Control.StateRef
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import Lean.Util.RecDepth
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import Lean.Util.Trace
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import Lean.Environment
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import Lean.Exception
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import Lean.InternalExceptionId
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import Lean.Eval
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import Lean.MonadEnv
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namespace Lean
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namespace Core
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structure State :=
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(env : Environment)
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(ngen : NameGenerator := {})
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(traceState : TraceState := {})
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instance State.inhabited : Inhabited State := ⟨{ env := arbitrary _ }⟩
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structure Context :=
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(options : Options := {})
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(currRecDepth : Nat := 0)
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(maxRecDepth : Nat := 1000)
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(ref : Syntax := Syntax.missing)
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abbrev CoreM := ReaderT Context $ StateRefT State $ EIO Exception
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instance CoreM.inhabited {α} : Inhabited (CoreM α) :=
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⟨fun _ _ => throw $ arbitrary _⟩
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instance : MonadError CoreM :=
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{ getRef := do ctx ← read; pure ctx.ref,
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withRef := fun α ref x => adaptReader (fun (ctx : Context) => { ctx with ref := ref }) x,
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addContext := fun ref msg => do
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ctx ← read;
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s ← get;
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pure (ref, MessageData.withContext { env := s.env, mctx := {}, lctx := {}, opts := ctx.options } msg) }
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instance : MonadEnv CoreM :=
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{ getEnv := do s ← get; pure s.env,
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modifyEnv := fun f => modify fun s => { s with env := f s.env } }
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instance : MonadOptions CoreM :=
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{ getOptions := do ctx ← read; pure ctx.options }
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instance : MonadNameGenerator CoreM :=
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{ getNGen := do s ← get; pure s.ngen,
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setNGen := fun ngen => modify fun s => { s with ngen := ngen } }
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instance : MonadRecDepth CoreM :=
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{ withRecDepth := fun α d x => adaptReader (fun (ctx : Context) => { ctx with currRecDepth := d }) x,
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getRecDepth := do ctx ← read; pure ctx.currRecDepth,
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getMaxRecDepth := do ctx ← read; pure ctx.maxRecDepth }
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@[inline] def liftIOCore {α} (x : IO α) : CoreM α := do
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ref ← getRef;
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liftM $ (adaptExcept (fun (err : IO.Error) => Exception.error ref (toString err)) x : EIO Exception α)
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instance : MonadIO CoreM :=
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{ liftIO := @liftIOCore }
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instance : SimpleMonadTracerAdapter CoreM :=
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{ getOptions := getOptions,
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getTraceState := do s ← get; pure s.traceState,
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addTraceContext := fun msg => Prod.snd <$> addContext Syntax.missing msg,
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modifyTraceState := fun f => modify $ fun s => { s with traceState := f s.traceState } }
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@[inline] def CoreM.run {α} (x : CoreM α) (ctx : Context) (s : State) : EIO Exception (α × State) :=
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(x.run ctx).run s
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@[inline] def CoreM.run' {α} (x : CoreM α) (ctx : Context) (s : State) : EIO Exception α :=
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Prod.fst <$> x.run ctx s
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@[inline] def CoreM.toIO {α} (x : CoreM α) (ctx : Context) (s : State) : IO (α × State) :=
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adaptExcept
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(fun (ex : Exception) => match ex with
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| Exception.error _ msg => IO.userError $ toString $ format msg
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| Exception.internal id => IO.userError $ toString $ "internal exception #" ++ toString id.idx)
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(x.run ctx s)
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instance hasEval {α} [MetaHasEval α] : MetaHasEval (CoreM α) :=
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⟨fun env opts x _ => do
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(a, s) ← (finally x printTraces).toIO { maxRecDepth := getMaxRecDepth opts, options := opts} { env := env};
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MetaHasEval.eval s.env opts a⟩
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end Core
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export Core (CoreM)
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@[inline] def catchInternalId {α} {m : Type → Type} [MonadExcept Exception m] (id : InternalExceptionId) (x : m α) (h : Exception → m α) : m α :=
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catch x fun ex => match ex with
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| Exception.error _ _ => throw ex
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| Exception.internal id' => if id == id' then h ex else throw ex
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@[inline] def catchInternalIds {α} {m : Type → Type} [MonadExcept Exception m] (ids : List InternalExceptionId) (x : m α) (h : Exception → m α) : m α :=
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catch x fun ex => match ex with
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| Exception.error _ _ => throw ex
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| Exception.internal id => if ids.contains id then h ex else throw ex
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end Lean
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