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ShellState.changeMain

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aarne
2004-12-22 12:49:44 +00:00
parent 430fd49622
commit f4ecc45831
1 changed files with 10 additions and 0 deletions
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10
src/GF/Compile/ShellState.hs
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@@ -208,6 +208,16 @@ purgeShellState sh = ShSt {
purge = nubBy (\x y -> fst x == fst y) . filter (flip elem needed . fst)
acncs = maybe [] singleton (abstract sh) ++ map (snd . fst) (concretes sh)
changeMain :: Maybe Ident -> ShellState -> Err ShellState
changeMain Nothing (ShSt _ _ cs ms ss cfs pis mos os rs acs s) =
return (ShSt Nothing Nothing cs ms ss cfs pis mos os rs acs s)
changeMain (Just c) (ShSt _ _ cs ms ss cfs pis mos os rs acs s) =
case lookup c (map fst cs) of
Just i -> do
a <- M.abstractOfConcrete ms i
return (ShSt (Just a) (Just i) cs ms ss cfs pis mos os rs acs s)
_ -> P.prtBad "The state has no concrete syntax named" c
-- form just one state grammar, if unique, from a canonical grammar
grammar2stateGrammar :: Options -> CanonGrammar -> Err StateGrammar