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module Morphology where
import AbsGFC
import GFC
import PrGrammar
import Operations
import Char
import List (sortBy, intersperse)
import Monad (liftM)
-- construct a morphological analyser from a GF grammar. AR 11/4/2001
-- we have found the binary search tree sorted by word forms more efficient
-- than a trie, at least for grammars with 7000 word forms
type Morpho = BinTree (String,[String])
emptyMorpho = NT
-- with literals
appMorpho :: Morpho -> String -> (String,[String])
appMorpho m s = (s, ps ++ ms) where
ms = case lookupTree id s m of
Ok vs -> vs
_ -> []
ps = [] ---- case lookupLiteral s of
---- Ok (t,_) -> [tagPrt t]
---- _ -> []
-- without literals
appMorphoOnly :: Morpho -> String -> (String,[String])
appMorphoOnly m s = (s, ms) where
ms = case lookupTree id s m of
Ok vs -> vs
_ -> []
-- recognize word, exluding literals
isKnownWord :: Morpho -> String -> Bool
isKnownWord mo = not . null . snd . appMorphoOnly mo
mkMorpho :: CanonGrammar -> Morpho
mkMorpho gr = emptyMorpho ----
{- ----
mkMorpho gr = mkMorphoTree $ concat $ map mkOne $ allItems where
mkOne (Left (fun,c)) = map (prOne fun c) $ allLins fun
mkOne (Right (fun,_)) = map (prSyn fun) $ allSyns fun
-- gather forms of lexical items
allLins fun = errVal [] $ do
ts <- allLinsOfFun gr fun
ss <- mapM (mapPairsM (mapPairsM (return . wordsInTerm))) ts
return [(p,s) | (p,fs) <- concat $ map snd $ concat ss, s <- fs]
prOne f c (ps,s) = (s, prt f +++ tagPrt c ++ concat (map tagPrt ps))
-- gather syncategorematic words
allSyns fun = errVal [] $ do
tss <- allLinsOfFun gr fun
let ss = [s | ts <- tss, (_,fs) <- ts, (_,s) <- fs]
return $ concat $ map wordsInTerm ss
prSyn f s = (s, "+<syncategorematic>" ++ tagPrt f)
-- all words, Left from lexical rules and Right syncategorematic
allItems = [lexRole t (f,c) | (f,c) <- allFuns, t <- lookType f] where
allFuns = allFunsWithValCat ab
lookType = errVal [] . liftM (:[]) . lookupFunType ab
lexRole t = case typeForm t of
Ok ([],_,_) -> Left
_ -> Right
-}
-- printing full-form lexicon and results
prMorpho :: Morpho -> String
prMorpho = unlines . map prMorphoAnalysis . tree2list
prMorphoAnalysis :: (String,[String]) -> String
prMorphoAnalysis (w,fs) = unlines (w:fs)
prMorphoAnalysisShort :: (String,[String]) -> String
prMorphoAnalysisShort (w,fs) = prBracket (w' ++ prTList "/" fs) where
w' = if null fs then w +++ "*" else ""
tagPrt :: Print a => a -> String
tagPrt = ("+" ++) . prt --- could look up print name in grammar
-- print all words recognized
allMorphoWords :: Morpho -> [String]
allMorphoWords = map fst . tree2list
-- analyse running text and show results either in short form or on separate lines
morphoTextShort mo = unwords . map (prMorphoAnalysisShort . appMorpho mo) . words
morphoText mo = unlines . map (('\n':) . prMorphoAnalysis . appMorpho mo) . words
-- format used in the Italian Verb Engine
prFullForm :: Morpho -> String
prFullForm = unlines . map prOne . tree2list where
prOne (s,ps) = s ++ " : " ++ unwords (intersperse "/" ps)
-- auxiliaries
mkMorphoTree :: (Ord a, Eq b) => [(a,b)] -> BinTree (a,[b])
mkMorphoTree = sorted2tree . sortAssocs
sortAssocs :: (Ord a, Eq b) => [(a,b)] -> [(a,[b])]
sortAssocs = arrange . sortBy (\ (x,_) (y,_) -> compare x y) where
arrange ((x,v):xvs) = arr x [v] xvs
arrange [] = []
arr y vs xs = case xs of
(x,v):xvs -> if x==y then arr y vvs xvs else (y,vs) : arr x [v] xvs
where vvs = if elem v vs then vs else (v:vs)
_ -> [(y,vs)]
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