X-Git-Url: http://git.cielonegro.org/gitweb.cgi?a=blobdiff_plain;f=Data%2FHList%2FString.hs;h=6d4d52ddfeba32fbaaad0c5488027a8ce81c1bd1;hb=57b97113a93d366f14278a12b8170a1c06e258a1;hp=ecb93edfc239d0b88d7a0f189746ef2afecd163e;hpb=b7e8a37aa24e9bda11995613c45187e6e19e0c01;p=hs-rrdtool.git

diff --git a/Data/HList/String.hs b/Data/HList/String.hs
index ecb93ed..6d4d52d 100644
--- a/Data/HList/String.hs
+++ b/Data/HList/String.hs
@@ -1,4 +1,41 @@
 module Data.HList.String
-    (
+    ( HString
+    , hString
     )
     where
+
+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 HNil
+
+instance ( Show c
+         , Show s
+         , Eq c
+         , Eq s
+         , IntegerT c
+         )
+    => HString (HCons 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 "HNil")
+quoteStrPat (c:cs) = conP (mkName "HCons")
+                     [ sigP wildP (decLiteralT $ toInteger $ fromEnum c)
+                     , quoteStrPat cs
+                     ]