, longMonthName
, longMonthNameP
- , show2
, show4
+ , show2
+ , show2'
- , read2
, read4
+ , read2
+ , read2'
, show4digitsTZ
, read4digitsTZ
| i ≥ 0 ∧ i < 100 = BT.integral i
| otherwise = error ("show2: the integer i must satisfy 0 <= i < 100: " ⧺ show i)
+show2' ∷ Integral i ⇒ i → AsciiBuilder
+{-# INLINE show2' #-}
+show2' = A.unsafeFromBuilder ∘ go
+ where
+ go i | i ≥ 0 ∧ i < 10 = B.fromByteString " " ⊕ BT.digit i
+ | i ≥ 0 ∧ i < 100 = BT.integral i
+ | otherwise = error ("show2': the integer i must satisfy 0 <= i < 100: " ⧺ show i)
+
read4 ∷ Num n ⇒ Parser n
{-# INLINEABLE read4 #-}
read4 = do n1 ← digit'
n2 ← digit'
return (n1 * 10 + n2)
+read2' ∷ Num n ⇒ Parser n
+{-# INLINEABLE read2' #-}
+read2' = do n1 ← (char ' ' *> pure 0) <|> digit'
+ n2 ← digit'
+ return (n1 * 10 + n2)
+
digit' ∷ Num n ⇒ Parser n
digit' = fromC <$> P.digit