major rename

[hs-rrdtool.git] / Data / HList / String.hs

diff --git a/Data/HList/String.hs b/Data/HList/String.hs
index a51457ed3a336f055df4ae3866353011cdcdba62..cb06ef82c2bc751ba712c789155c2864b03b61fd 100644 (file)
--- a/Data/HList/String.hs
+++ b/Data/HList/String.hs
@@ -1,6 +1,41 @@
 module Data.HList.String
-    (
+    ( HString
+    , hString
     )
     where
 
---import Data.HList.Prelude
+import Data.HList.Prelude
+import Language.Haskell.TH
+import Language.Haskell.TH.Quote
+import Types.Data.Num.Decimal.Literals.TH
+import Types.Data.Num.Ops
+
+
+class (Show s, Eq s) => HString s
+
+instance HString Nil
+
+instance ( Show c
+         , Show s
+         , Eq c
+         , Eq s
+         , IntegerT c
+         )
+    => HString (Cons c s)
+
+hString :: QuasiQuoter
+hString = QuasiQuoter quoteStrExp quoteStrPat
+
+quoteStrExp :: String -> ExpQ
+quoteStrExp []     = varE (mkName "hNil")
+quoteStrExp (c:cs) = appsE [ varE (mkName "hCons")
+                           , decLiteralV (toInteger $ fromEnum c)
+                           , quoteStrExp cs
+                           ]
+
+quoteStrPat :: String -> PatQ
+quoteStrPat []     = varP (mkName "Nil")
+quoteStrPat (c:cs) = conP (mkName "Cons")
+                     [ sigP wildP (decLiteralT $ toInteger $ fromEnum c)
+                     , quoteStrPat cs
+                     ]