36 lines
1.1 KiB
Text
36 lines
1.1 KiB
Text
/-
|
||
Copyright (c) 2019 Microsoft Corporation. All rights reserved.
|
||
Released under Apache 2.0 license as described in the file LICENSE.
|
||
Authors: Leonardo de Moura, Sebastian Ullrich
|
||
-/
|
||
import Lean.Environment
|
||
|
||
namespace Lean
|
||
|
||
universe u
|
||
|
||
/-- `HasEval` extension that gives access to the current environment & options.
|
||
The basic `HasEval` class is in the prelude and should not depend on these
|
||
types. -/
|
||
class MetaHasEval (α : Type u) :=
|
||
(eval : Environment → Options → α → forall (hideUnit : optParam Bool true), IO Environment)
|
||
|
||
instance metaHasEvalOfHasEval {α : Type u} [HasEval α] : MetaHasEval α :=
|
||
⟨fun env opts a hideUnit => do HasEval.eval a hideUnit; pure env⟩
|
||
|
||
abbrev MetaIO := ReaderT (Environment × Options) IO
|
||
|
||
def MetaIO.getEnv : MetaIO Environment := do
|
||
ctx ← read; pure ctx.1
|
||
|
||
def MetaIO.getOptions : MetaIO Options := do
|
||
ctx ← read; pure ctx.2
|
||
|
||
instance MetaIO.metaHasEval {α} [MetaHasEval α] : MetaHasEval (MetaIO α) :=
|
||
⟨fun env opts x _ => do
|
||
a ← x (env, opts);
|
||
MetaHasEval.eval env opts a⟩
|
||
|
||
instance MetaIO.monadIO : MonadIO MetaIO := {}
|
||
|
||
end Lean
|