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showExpr and linearize now refresh the printed variables if needed

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aarneranta
2024-03-01 09:17:08 +01:00
parent c2182274df
commit 7e707508a7
2 changed files with 15 additions and 4 deletions
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17
src/runtime/haskell/PGF/Expr.hs
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@@ -17,7 +17,8 @@ module PGF.Expr(Tree, BindType(..), Expr(..), Literal(..), Patt(..), Equation(..
MetaId,
-- helpers
pMeta,pArg,pLit,freshName,ppMeta,ppLit,ppParens
pMeta,pArg,pLit,freshName,ppMeta,ppLit,ppParens,
freshBoundVars
) where
import PGF.CId
@@ -235,10 +236,11 @@ pLit = liftM LStr (RP.readS_to_P reads)
ppExpr :: Int -> [CId] -> Expr -> PP.Doc
ppExpr d scope (EAbs b x e) = let (bs,xs,e1) = getVars [] [] (EAbs b x e)
xs' = freshBoundVars scope xs
in ppParens (d > 1) (PP.char '\\' PP.<>
PP.hsep (PP.punctuate PP.comma (reverse (List.zipWith ppBind bs xs))) PP.<+>
PP.hsep (PP.punctuate PP.comma (reverse (List.zipWith ppBind bs xs'))) PP.<+>
PP.text "->" PP.<+>
ppExpr 1 (xs++scope) e1)
ppExpr 1 (xs' ++ scope) e1)
where
getVars bs xs (EAbs b x e) = getVars (b:bs) ((freshName x xs):xs) e
getVars bs xs e = (bs,xs,e)
@@ -289,6 +291,15 @@ freshName x xs0 = loop 1 x
| elem y xs = loop (i+1) (mkCId (show x++show i))
| otherwise = y
-- refresh new vars xs in scope if needed. AR 2024-03-01
freshBoundVars :: [CId] -> [CId] -> [CId]
freshBoundVars scope xs = foldr fresh [] xs
where
fresh x xs' = mkCId (freshName (showCId x) xs') : xs'
freshName s xs' =
if elem (mkCId s) (xs' ++ scope)
then freshName (s ++ "'") xs'
else s
-----------------------------------------------------
-- Computation