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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"
|
