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fix the other 2 pred/succ conversions
authoralfadur
Wed, 21 Sep 2022 06:55:31 +0300
changeset 15872 c09063ea0267
parent 15871 9cd8d7748199
child 15875 d7b53d08ad9c
fix the other 2 pred/succ conversions
tools/pas2c/Pas2C.hs file | annotate | diff | comparison | revisions 
--- a/tools/pas2c/Pas2C.hs	Wed Sep 21 06:36:05 2022 +0300
+++ b/tools/pas2c/Pas2C.hs	Wed Sep 21 06:55:31 2022 +0300
@@ -711,8 +711,10 @@
          a -> error $ "BuiltInFunction 'high' in initExpr: " ++ show a ++ ": " ++ show hi
 initExpr2C' (BuiltInFunction "succ" [BuiltInFunction "pred" [e]]) = initExpr2C' e
 initExpr2C' (BuiltInFunction "pred" [BuiltInFunction "succ" [e]]) = initExpr2C' e
-initExpr2C' (BuiltInFunction "succ" [e]) = liftM (\e' ->  text "(" <> e' <> text " + 1)") $ initExpr2C' e
-initExpr2C' (BuiltInFunction "pred" [e]) = liftM (\e' ->  text "(" <> e' <> text " - 1)") $ initExpr2C' e
+initExpr2C' (BuiltInFunction "succ" [e]) = 
+    liftM (parens . (<> text " + 1")) $ initExpr2C' e
+initExpr2C' (BuiltInFunction "pred" [e]) = 
+    liftM (parens . (<> text " - 1")) $ initExpr2C' e
 initExpr2C' b@(BuiltInFunction _ _) = error $ show b
 initExpr2C' (InitTypeCast t' i) = do
     e <- initExpr2C i
@@ -1094,10 +1096,10 @@
          BTArray (RangeFromTo _ n) _ _ -> initExpr2C n
          _ -> error $ "BuiltInFunCall 'high' from " ++ show e ++ "\ntype: " ++ show lt
 expr2C (BuiltInFunCall [e] (SimpleReference (Identifier "ord" _))) = liftM parens $ expr2C e
-expr2C (BuiltInFunCall [e] (SimpleReference (Identifier "succ" _))) = liftM (<> text " + 1") $ expr2C e
-expr2C (BuiltInFunCall [e] (SimpleReference (Identifier "pred" _))) = do
-    e'<- expr2C e
-    return $ text "(int)" <> parens e' <> text " - 1"
+expr2C (BuiltInFunCall [e] (SimpleReference (Identifier "succ" _))) = 
+    liftM (parens . (<> text " + 1")) $ expr2C e
+expr2C (BuiltInFunCall [e] (SimpleReference (Identifier "pred" _))) = 
+    liftM (parens . (<> text " - 1") . ((text "(int)") <>) . parens) $ expr2C e
 expr2C (BuiltInFunCall [e] (SimpleReference (Identifier "length" _))) = do
     e' <- expr2C e
     lt <- gets lastType
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