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+----------------------------------------------------------------------
+-- |
+-- Module : LookAbs
+-- Maintainer : AR
+-- Stability : (stable)
+-- Portability : (portable)
+--
+-- > CVS $Date: 2005/04/28 16:42:48 $
+-- > CVS $Author: aarne $
+-- > CVS $Revision: 1.14 $
+--
+-- (Description of the module)
+-----------------------------------------------------------------------------
+
+module GF.Grammar.LookAbs (
+ lookupFunType,
+ lookupCatContext
+ ) where
+
+import GF.Data.Operations
+import GF.Grammar.Abstract
+import GF.Infra.Ident
+
+import GF.Infra.Modules
+
+import Data.List (nub)
+import Control.Monad
+
+-- | this is needed at compile time
+lookupFunType :: Grammar -> Ident -> Ident -> Err Type
+lookupFunType gr m c = do
+ mi <- lookupModule gr m
+ case mi of
+ ModMod mo -> do
+ info <- lookupIdentInfo mo c
+ case info of
+ AbsFun (Yes t) _ -> return t
+ AnyInd _ n -> lookupFunType gr n c
+ _ -> prtBad "cannot find type of" c
+ _ -> Bad $ prt m +++ "is not an abstract module"
+
+-- | this is needed at compile time
+lookupCatContext :: Grammar -> Ident -> Ident -> Err Context
+lookupCatContext gr m c = do
+ mi <- lookupModule gr m
+ case mi of
+ ModMod mo -> do
+ info <- lookupIdentInfo mo c
+ case info of
+ AbsCat (Yes co) _ -> return co
+ AnyInd _ n -> lookupCatContext gr n c
+ _ -> prtBad "unknown category" c
+ _ -> Bad $ prt m +++ "is not an abstract module"