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now the parser could return partial parse results

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This commit is contained in:
krasimir
2010-05-19 12:31:36 +00:00
parent ec227abe43
commit 31856ebb4c
4 changed files with 56 additions and 30 deletions
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4
src/compiler/GF/Command/Commands.hs
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@@ -1004,9 +1004,7 @@ allCommands env@(pgf, mos) = Map.fromList [
toString = unwords . toStrings
fromParse opts ts parses
| isOpt "bracket" opts = case catMaybes bss of
[] -> ([], "no brackets found")
bss -> ([], unlines $ map showBracketedString bss)
| isOpt "bracket" opts = ([], unlines $ map showBracketedString bss)
| otherwise = case ts of
[] -> ([], "no trees found" ++
missingWordMsg (optMorpho opts) (concatMap words (toStrings ts))

4
src/runtime/haskell/PGF.hs
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@@ -154,10 +154,10 @@ parseAll :: PGF -> Type -> String -> [[Tree]]
parseAllLang :: PGF -> Type -> String -> [(Language,[Tree])]
-- | The same as 'parse' but returns more detailed information
parse_ :: PGF -> Language -> Type -> String -> (Parse.ParseResult,Maybe BracketedString)
parse_ :: PGF -> Language -> Type -> String -> (Parse.ParseResult,BracketedString)
-- | This is an experimental function. Use it on your own risk
parseWithRecovery :: PGF -> Language -> Type -> [Type] -> String -> (Parse.ParseResult,Maybe BracketedString)
parseWithRecovery :: PGF -> Language -> Type -> [Type] -> String -> (Parse.ParseResult,BracketedString)
-- | The same as 'generateAllDepth' but does not limit
-- the depth in the generation, and doesn't give an initial expression.

27
src/runtime/haskell/PGF/Forest.hs
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@@ -32,8 +32,7 @@ data Forest
{ abstr :: Abstr
, concr :: Concr
, forest :: IntMap.IntMap (Set.Set Production)
, root :: {-# UNPACK #-} !FId
, label :: {-# UNPACK #-} !LIndex
, root :: [([Symbol],[FId])]
}
--------------------------------------------------------------------
@@ -49,11 +48,13 @@ linearizeWithBrackets = head . snd . untokn "" . bracketedTokn
--
bracketedTokn :: Forest -> BracketedTokn
bracketedTokn (Forest abs cnc forest root label) =
let (fid,cat,lin) = render IntMap.empty root
in Bracket_ cat fid label (lin ! label)
bracketedTokn (Forest abs cnc forest root) =
case [computeSeq seq (map (render IntMap.empty) args) | (seq,args) <- root] of
([bs@(Bracket_ cat fid label lin)]:_) -> bs
(bss:_) -> Bracket_ wildCId 0 0 bss
[] -> Bracket_ wildCId 0 0 []
where
trusted = trustedSpots IntSet.empty root
trusted = foldl1 IntSet.intersection [IntSet.unions (map (trustedSpots IntSet.empty) args) | (_,args) <- root]
render parents fid =
case (IntMap.lookup fid parents) `mplus` (fmap Set.toList $ IntMap.lookup fid forest) of
@@ -63,12 +64,16 @@ bracketedTokn (Forest abs cnc forest root label) =
descend parents (PApply funid args) = let (CncFun fun lins) = cncfuns cnc ! funid
Just (DTyp _ cat _,_,_) = Map.lookup fun (funs abs)
largs = map (render parents) args
in (fid,cat,listArray (bounds lins) [computeSeq seqid largs | seqid <- elems lins])
ltable = listArray (bounds lins)
[computeSeq (elems (sequences cnc ! seqid)) largs |
seqid <- elems lins]
in (fid,cat,ltable)
descend parents (PCoerce fid) = render parents fid
descend parents (PConst cat _ ts) = (fid,cat,listArray (0,0) [[LeafKS ts]])
trustedSpots parents fid
| IntSet.member fid parents
| fid < totalCats cnc || -- forest ids from the grammar correspond to metavariables
IntSet.member fid parents -- this avoids loops in the grammar
= IntSet.empty
| otherwise = IntSet.insert fid $
case IntMap.lookup fid forest of
@@ -81,11 +86,9 @@ bracketedTokn (Forest abs cnc forest root label) =
descend (PCoerce fid) = trustedSpots parents' fid
descend (PConst c e _) = IntSet.empty
computeSeq :: SeqId -> [(FId,CId,LinTable)] -> [BracketedTokn]
computeSeq seqid args = concatMap compute (elems seq)
computeSeq :: [Symbol] -> [(FId,CId,LinTable)] -> [BracketedTokn]
computeSeq seq args = concatMap compute seq
where
seq = sequences cnc ! seqid
compute (SymCat d r) = getArg d r
compute (SymLit d r) = getArg d r
compute (SymKS ts) = [LeafKS ts]

51
src/runtime/haskell/PGF/Parse.hs
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@@ -38,16 +38,16 @@ data ParseResult
-- if there are many analizes for some phrase but they all are not type correct.
| ParseResult [Tree] -- ^ If the parsing was successful we get a list of abstract syntax trees. The list should be non-empty.
parse :: PGF -> Language -> Type -> [String] -> (ParseResult,Maybe BracketedString)
parse :: PGF -> Language -> Type -> [String] -> (ParseResult,BracketedString)
parse pgf lang typ toks = loop (initState pgf lang typ) toks
where
loop ps [] = getParseResult ps typ
loop ps (t:ts) = case nextState ps t of
Left es -> case es of
EState _ _ chart -> (ParseFailed (offset chart),Nothing)
EState _ _ chart -> (ParseFailed (offset chart),snd (getParseResult ps typ))
Right ps -> loop ps ts
parseWithRecovery :: PGF -> Language -> Type -> [Type] -> [String] -> (ParseResult,Maybe BracketedString)
parseWithRecovery :: PGF -> Language -> Type -> [Type] -> [String] -> (ParseResult,BracketedString)
parseWithRecovery pgf lang typ open_typs toks = accept (initState pgf lang typ) toks
where
accept ps [] = getParseResult ps typ
@@ -155,11 +155,13 @@ recoveryStates open_types (EState pgf cnc chart) =
-- that spans the whole input consumed so far. The trees are also
-- limited by the category specified, which is usually
-- the same as the startup category.
getParseResult :: ParseState -> Type -> (ParseResult,Maybe BracketedString)
getParseResult :: ParseState -> Type -> (ParseResult,BracketedString)
getParseResult (PState pgf cnc chart items) ty@(DTyp _ start _) =
let mb_bs = case roots of
((AK fid lbl):_) -> Just $ linearizeWithBrackets $ Forest (abstract pgf) cnc (forest st) fid lbl
_ -> Nothing
let froots | null roots = getPartialSeq (sequences cnc) (reverse (active st : actives st)) acc1
| otherwise = [([SymCat 0 lbl],[fid]) | AK fid lbl <- roots]
bs = linearizeWithBrackets (Forest (abstract pgf) cnc (forest st) froots)
exps = nubsort $ do
(AK fid lbl) <- roots
@@ -172,11 +174,15 @@ getParseResult (PState pgf cnc chart items) ty@(DTyp _ start _) =
then ParseFailed (offset chart)
else ParseResult exps
in (res,mb_bs)
in (res,bs)
where
(mb_agenda,acc) = TMap.decompose items
agenda = maybe [] Set.toList mb_agenda
(_,st) = process Nothing (\_ _ -> id) (sequences cnc) (cncfuns cnc) agenda () chart
(acc1,st) = process Nothing add (sequences cnc) (cncfuns cnc) agenda [] chart
add _ (Active j ppos funid seqid args key) items = (j,lin,args,key) : items
where
lin = take (ppos-1) (elems (unsafeAt (sequences cnc) seqid))
roots = case Map.lookup start (cnccats cnc) of
Just (CncCat s e lbls) -> do cat <- range (s,e)
@@ -187,18 +193,18 @@ getParseResult (PState pgf cnc chart items) ty@(DTyp _ start _) =
go rec fcat' (d,fcat)
| fcat < totalCats cnc = return (Set.empty,EMeta (fcat'*10+d)) -- FIXME: here we assume that every rule has at most 10 arguments
| Set.member fcat rec = mzero
| otherwise = foldForest (\funid args trees ->
| Set.member fcat rec = mzero
| otherwise = foldForest (\funid args trees ->
do let CncFun fn lins = cncfuns cnc ! funid
args <- mapM (go (Set.insert fcat rec) fcat) (zip [0..] args)
check_ho_fun fn args
`mplus`
trees)
(\const _ trees ->
(\const _ trees ->
return (freeVar const,const)
`mplus`
trees)
[] fcat (forest st)
[] fcat (forest st)
check_ho_fun fun args
| fun == _V = return (head args)
@@ -211,6 +217,25 @@ getParseResult (PState pgf cnc chart items) ty@(DTyp _ start _) =
freeVar (EFun v) = Set.singleton v
freeVar _ = Set.empty
getPartialSeq seqs actives = expand Set.empty
where
expand acc [] =
[(lin,args) | (j,lin,args,key) <- Set.toList acc, j == 0]
expand acc (item@(j,lin,args,key) : items)
| item `Set.member` acc = expand acc items
| otherwise = expand acc' items'
where
acc' = Set.insert item acc
items' = case lookupAC key (actives !! j) of
Nothing -> items
Just set -> [if j' < j
then let lin' = take ppos (elems (unsafeAt seqs seqid))
in (j',lin'++map (inc (length args')) lin,args'++args,key')
else (j',lin,args,key') | Active j' ppos funid seqid args' key' <- Set.toList set] ++ items
inc n (SymCat d r) = SymCat (n+d) r
inc n (SymLit d r) = SymLit (n+d) r
inc n s = s
process mbt fn !seqs !funs [] acc chart = (acc,chart)
process mbt fn !seqs !funs (item@(Active j ppos funid seqid args key0):items) acc chart