Tests for Data.Time.Asctime

[time-http.git] / Data / Time / HTTP / Common.hs

diff --git a/Data/Time/HTTP/Common.hs b/Data/Time/HTTP/Common.hs
index cf5412c28b093eca5844e8286cec529f78f4a6e8..1cfa89e9c63528268d721d309927dc58f981f586 100644 (file)
--- a/Data/Time/HTTP/Common.hs
+++ b/Data/Time/HTTP/Common.hs
@@ -15,11 +15,13 @@ module Data.Time.HTTP.Common
     , longMonthName
     , longMonthNameP
 
-    , show2
     , show4
+    , show2
+    , show2'
 
-    , read2
     , read4
+    , read2
+    , read2'
 
     , show4digitsTZ
     , read4digitsTZ
@@ -211,6 +213,14 @@ show2 = A.unsafeFromBuilder ∘ go
            | 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'
@@ -225,6 +235,12 @@ read2 = 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