added exprSize and exprFunctions in the Haskell runtime too and use them in TreeOperations

src/runtime/haskell/PGF.hs

@@ -54,7 +54,7 @@ module PGF(
            mkFloat,  unFloat,
            mkMeta,   unMeta,
            -- extra
-           pExpr,
+           pExpr, exprSize, exprFunctions,
 
            -- * Operations
            -- ** Linearization
@@ -314,6 +314,23 @@ functionType pgf fun =
 compute :: PGF -> Expr -> Expr
 compute pgf = PGF.Data.normalForm (funs (abstract pgf),const Nothing) 0 []
 
+exprSize :: Expr -> Int
+exprSize (EAbs _ _ e) = exprSize e
+exprSize (EApp e1 e2) = exprSize e1 + exprSize e2
+exprSize (ETyped e ty)= exprSize e
+exprSize (EImplArg e) = exprSize e
+exprSize _            = 1
+
+exprFunctions :: Expr -> [CId]
+exprFunctions (EAbs _ _ e) = exprFunctions e
+exprFunctions (EApp e1 e2) = exprFunctions e1 ++ exprFunctions e2
+exprFunctions (ETyped e ty)= exprFunctions e
+exprFunctions (EImplArg e) = exprFunctions e
+exprFunctions (EFun f)     = [f]
+exprFunctions _            = []
+
+--exprFunctions :: Expr -> [Fun]
+
 browse :: PGF -> CId -> Maybe (String,[CId],[CId])
 browse pgf id = fmap (\def -> (def,producers,consumers)) definition
   where