1 files changed, 51 insertions, 0 deletions
diff --git a/src/GF/Compile/RemoveLiT.hs b/src/GF/Compile/RemoveLiT.hs
new file mode 100644
index 000000000..0e45be8c0
--- /dev/null
+++ b/src/GF/Compile/RemoveLiT.hs
@@ -0,0 +1,51 @@
+module RemoveLiT (removeLiT) where
+
+import Grammar
+import Ident
+import Modules
+import Macros
+import Lookup
+
+import Operations
+
+import Monad
+
+-- remove obsolete (Lin C) expressions before doing anything else. AR 21/6/2003
+
+-- What the program does is replace the occurrences of Lin C with the actual
+-- definition T given in lincat C = T ; with {s : Str} if no lincat is found.
+-- The procedule is uncertain, if T contains another Lin.
+
+removeLiT :: SourceGrammar -> Err SourceGrammar
+removeLiT gr = liftM MGrammar $ mapM (remlModule gr) (modules gr)
+
+remlModule :: SourceGrammar -> (Ident,SourceModInfo) -> Err (Ident,SourceModInfo)
+remlModule gr mi@(name,mod) = case mod of
+  ModMod (Module mt fs me ops js) -> do
+    js1 <- mapMTree (remlResInfo gr) js
+    let mod2 = ModMod $ Module mt fs me ops js1
+    return $ (name,mod2)
+  _ -> return mi
+
+remlResInfo :: SourceGrammar -> (Ident,Info) -> Err (Ident,Info)
+remlResInfo gr mi@(i,info) = case info of
+  ResOper pty ptr    -> liftM ((,) i) $ liftM2 ResOper (ren pty) (ren ptr)
+  CncCat pty ptr ppr -> liftM ((,) i) $ liftM3 CncCat (ren pty) (ren ptr) (ren ppr)
+  CncFun mt  ptr ppr -> liftM ((,) i) $ liftM2 (CncFun mt)      (ren ptr) (ren ppr)
+  _ -> return mi
+ where 
+   ren = remlPerh gr
+
+remlPerh gr pt = case pt of
+  Yes t -> liftM Yes $ remlTerm gr t
+  _ -> return pt
+
+remlTerm :: SourceGrammar -> Term -> Err Term
+remlTerm gr trm = case trm of
+  LiT c -> look c >>= remlTerm gr
+  _ -> composOp (remlTerm gr) trm
+ where
+   look c = err (const $ return defLinType) return $ lookupLincat gr m c
+   m = case [cnc | (cnc,ModMod m) <- modules gr, isModCnc m] of
+     cnc:_ -> cnc   -- actually there is always exactly one
+     _ -> zIdent "CNC"