clean up demo code

[coq-hetmet.git] / src / HaskWeakVars.v

diff --git a/src/HaskWeakVars.v b/src/HaskWeakVars.v
index c43842f..e7ab943 100644 (file)
--- a/src/HaskWeakVars.v
+++ b/src/HaskWeakVars.v
@@ -4,85 +4,56 @@
 
 Generalizable All Variables.
 Require Import Preamble.
-Require Import General.
 Require Import Coq.Strings.String.
 Require Import Coq.Lists.List.
-Require Import HaskGeneral.
+Require Import General.
+Require Import HaskKinds.
 Require Import HaskLiterals.
+Require Import HaskTyCons.
 Require Import HaskCoreVars.
 Require Import HaskCoreTypes.
+Require Import HaskWeakTypes.
 
-Inductive WeakTypeVar := weakTypeVar : CoreVar -> Kind     -> WeakTypeVar.
-
-Inductive WeakCoercion : Type := weakCoercion : CoreType -> CoreType -> CoreCoercion -> WeakCoercion.
-
-Inductive WeakCoerVar := weakCoerVar : CoreVar -> CoreType -> CoreType -> WeakCoerVar.
+Inductive CoreVarToWeakVarResult : Type :=
+| CVTWVR_EVar  : CoreType ->             CoreVarToWeakVarResult
+| CVTWVR_TyVar : Kind     ->             CoreVarToWeakVarResult
+| CVTWVR_CoVar : CoreType -> CoreType -> CoreVarToWeakVarResult.
 
-Inductive WeakExprVar := weakExprVar : CoreVar -> CoreType -> WeakExprVar.
+(* a WeakExprVar just wraps a CoreVar and tags it with the type of its value *)
+Inductive WeakExprVar := weakExprVar : CoreVar -> WeakType -> WeakExprVar.
 
+(* a WeakVar is one of the three sorts *)
 Inductive WeakVar : Type :=
 | WExprVar : WeakExprVar -> WeakVar
 | WTypeVar : WeakTypeVar -> WeakVar
 | WCoerVar : WeakCoerVar -> WeakVar.
+  Coercion WExprVar : WeakExprVar >-> WeakVar.
+  Coercion WTypeVar : WeakTypeVar >-> WeakVar.
+  Coercion WCoerVar : WeakCoerVar >-> WeakVar.
 
-Definition haskLiteralToCoreType lit : CoreType :=
-  TyConApp (haskLiteralToTyCon lit) nil.
-
-Definition weakTypeToCoreType (wt:CoreType) : CoreType := wt.
-
-Definition weakTypeToString : CoreType -> string := coreTypeToString ○ weakTypeToCoreType.
-
-(* EqDecidable instances for all of the above *)
-Instance CoreTypeVarEqDecidable : EqDecidable WeakTypeVar.
-  apply Build_EqDecidable.
-  intros.
-  destruct v1 as [cv1 k1].
-  destruct v2 as [cv2 k2].
-  destruct (eqd_dec cv1 cv2); subst.
-    destruct (eqd_dec k1 k2); subst.
-    left; auto.
-    right; intro; apply n; inversion H; subst; auto.
-    right; intro; apply n; inversion H; subst; auto.
-    Defined.
-
-Instance WeakCoerVarEqDecidable : EqDecidable WeakCoerVar.
-  apply Build_EqDecidable.
-  intros.
-  destruct v1 as [cv1 t1a t1b].
-  destruct v2 as [cv2 t2a t2b].
-  destruct (eqd_dec cv1 cv2); subst.
-    destruct (eqd_dec t1a t2a); subst.
-    destruct (eqd_dec t1b t2b); subst.
-    left; auto.
-    right; intro; apply n; inversion H; subst; auto.
-    right; intro; apply n; inversion H; subst; auto.
-    right; intro; apply n; inversion H; subst; auto.
-    Defined.
+Definition weakTypeVarToKind (tv:WeakTypeVar) : Kind :=
+  match tv with weakTypeVar _ k => k end.
+  Coercion weakTypeVarToKind : WeakTypeVar >-> Kind.
 
-Instance WeakExprVarEqDecidable : EqDecidable WeakExprVar.
-  apply Build_EqDecidable.
-  intros.
-  destruct v1 as [cv1 k1].
-  destruct v2 as [cv2 k2].
-  destruct (eqd_dec cv1 cv2); subst.
-    destruct (eqd_dec k1 k2); subst.
-    left; auto.
-    right; intro; apply n; inversion H; subst; auto.
-    right; intro; apply n; inversion H; subst; auto.
-    Defined.
+Definition weakVarToCoreVar (wv:WeakVar) : CoreVar :=
+  match wv with
+  | WExprVar (weakExprVar v _  ) => v
+  | WTypeVar (weakTypeVar v _  ) => v
+  | WCoerVar (weakCoerVar v _ _) => v
+ end.
+ Coercion weakVarToCoreVar : WeakVar >-> CoreVar.
 
-Instance WeakVarEqDecidable : EqDecidable WeakVar.
-  apply Build_EqDecidable.
-  induction v1; destruct v2; try (right; intro q; inversion q; fail) ; auto;
-     destruct (eqd_dec w w0); subst.
-     left; auto.
-     right; intro X; apply n; inversion X; auto.
-     left; auto.
-     right; intro X; apply n; inversion X; auto.
-     left; auto.
-     right; intro X; apply n; inversion X; auto.
-  Defined.
+Definition haskLiteralToWeakType lit : WeakType :=
+  WTyCon (haskLiteralToTyCon lit).
+  Coercion haskLiteralToWeakType : HaskLiteral >-> WeakType.
 
+Variable coreVarToWeakVar  : CoreVar     -> CoreVarToWeakVarResult. Extract Inlined Constant coreVarToWeakVar => "coreVarToWeakVar".
+Variable getTyConTyVars_   : CoreTyCon   -> list CoreVar.           Extract Inlined Constant getTyConTyVars_  => "getTyConTyVars".
 
+Variable rawTyFunKind : CoreTyCon -> ((list Kind) * Kind). Extract Inlined Constant rawTyFunKind => "rawTyFunKind".
 
+Definition tyFunKind (tc:TyFun) : ((list Kind) * Kind) :=
+  rawTyFunKind tc.
 
+Instance WeakVarToString : ToString WeakVar :=
+  { toString := fun x => toString (weakVarToCoreVar x) }.