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two new functions in the PGF API: mkAbs, unAbs

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krasimir
2010-07-31 16:40:16 +00:00
parent 98c22ef92b
commit 94bd76df72
2 changed files with 11 additions and 0 deletions
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1
src/runtime/haskell/PGF.hs
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@@ -43,6 +43,7 @@ module PGF(
-- ** Expr -- ** Expr
Expr, Expr,
showExpr, readExpr, showExpr, readExpr,
mkAbs, unAbs,
mkApp, unApp, mkApp, unApp,
mkStr, unStr, mkStr, unStr,
mkInt, unInt, mkInt, unInt,

10
src/runtime/haskell/PGF/Expr.hs
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@@ -1,6 +1,7 @@
module PGF.Expr(Tree, BindType(..), Expr(..), Literal(..), Patt(..), Equation(..), module PGF.Expr(Tree, BindType(..), Expr(..), Literal(..), Patt(..), Equation(..),
readExpr, showExpr, pExpr, pBinds, ppExpr, ppPatt, pattScope, readExpr, showExpr, pExpr, pBinds, ppExpr, ppPatt, pattScope,
mkAbs, unAbs,
mkApp, unApp, mkApp, unApp,
mkStr, unStr, mkStr, unStr,
mkInt, unInt, mkInt, unInt,
@@ -96,6 +97,15 @@ showExpr vars = PP.render . ppExpr 0 vars
instance Read Expr where instance Read Expr where
readsPrec _ = RP.readP_to_S pExpr readsPrec _ = RP.readP_to_S pExpr
mkAbs :: BindType -> CId -> Expr -> Expr
mkAbs = EAbs
unAbs :: Expr -> Maybe (BindType, CId, Expr)
unAbs (EAbs bt x e) = Just (bt,x,e)
unAbs (ETyped e ty) = unAbs e
unAbs (EImplArg e) = unAbs e
unAbs _ = Nothing
-- | Constructs an expression by applying a function to a list of expressions -- | Constructs an expression by applying a function to a list of expressions
mkApp :: CId -> [Expr] -> Expr mkApp :: CId -> [Expr] -> Expr
mkApp f es = foldl EApp (EFun f) es mkApp f es = foldl EApp (EFun f) es