the embedded grammars now work with both the pure Haskell and the Haskell binding API

src/compiler/GF/Compile/PGFtoHaskell.hs

@@ -56,21 +56,20 @@ haskPreamble gadt name =
   "import Data.Monoid"
   ] else []) ++
  [
-  "import PGF hiding (Tree)",
+  "import PGF",
-  "import qualified PGF",
   "----------------------------------------------------",
   "-- automatic translation from GF to Haskell",
   "----------------------------------------------------",
   "", 
   "class Gf a where",
-  "  gf :: a -> PGF.Tree",
+  "  gf :: a -> Expr",
-  "  fg :: PGF.Tree -> a",
+  "  fg :: Expr -> a",
   "",
   predefInst gadt "GString" "String"  "unStr"    "mkStr",
   "",
   predefInst gadt "GInt"    "Int"     "unInt"    "mkInt",
   "",
-  predefInst gadt "GFloat"  "Double"  "unDouble" "mkDouble",
+  predefInst gadt "GFloat"  "Double"  "unFloat"  "mkFloat",
   "",
   "----------------------------------------------------",
   "-- below this line machine-generated",

src/runtime/haskell-bind/PGF2.hsc

@@ -38,6 +38,7 @@ module PGF2 (-- * PGF
              mkInt,unInt,
              mkFloat,unFloat,
              mkMeta,unMeta,
+             mkCId,
              -- ** Types
              Type, Hypo, BindType(..), startCat,
              readType, showType,

src/runtime/haskell-bind/PGF2/Expr.hsc

@@ -176,6 +176,9 @@ unMeta (Expr expr touch) =
                 touch
                 return (Just (fromIntegral (id :: CInt)))
 
+-- | this functions is only for backward compatibility with the old Haskell runtime
+mkCId x = x
+
 -- | parses a 'String' as an expression
 readExpr :: String -> Maybe Expr
 readExpr str =

src/runtime/haskell/PGF.hs

@@ -51,6 +51,7 @@ module PGF(
            mkStr,    unStr,
            mkInt,    unInt,
            mkDouble, unDouble,
+           mkFloat,  unFloat,
            mkMeta,   unMeta,
            -- extra
            pExpr,

src/runtime/haskell/PGF/Expr.hs

@@ -6,6 +6,7 @@ module PGF.Expr(Tree, BindType(..), Expr(..), Literal(..), Patt(..), Equation(..
                 mkStr,    unStr,
                 mkInt,    unInt,
                 mkDouble, unDouble,
+                mkFloat,  unFloat,
                 mkMeta,   unMeta,
 
                 normalForm,
@@ -154,6 +155,9 @@ unDouble (ETyped e ty)   = unDouble e
 unDouble (EImplArg e)    = unDouble e
 unDouble _               = Nothing
 
+mkFloat = mkDouble
+unFloat = unDouble
+
 -- | Constructs an expression which is meta variable
 mkMeta :: Int -> Expr
 mkMeta i = EMeta i