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module Parser where
import Data.Char
import Control.Monad
import PGF2
import SusanneFormat
import Debug.Trace
newtype P a = P {runP :: PGF -> Concr -> [ParseTree] -> Maybe ([ParseTree], a)}
instance Monad P where
return x = P (\pgf cnc ts -> Just (ts, x))
f >>= g = P (\pgf cnc ts -> case runP f pgf cnc ts of
Nothing -> Nothing
Just (ts,x) -> runP (g x) pgf cnc ts)
instance MonadPlus P where
mzero = P (\pgf cnc ts -> Nothing)
mplus f g = P (\pgf cnc ts -> mplus (runP f pgf cnc ts) (runP g pgf cnc ts))
getConcr = P (\pgf cnc ts -> Just (ts,cnc))
match convert tag_spec = P (\pgf cnc ts ->
case ts of
(t@(Phrase tag1 mods1 fn1 _ _):ts)
| tag == tag1 &&
all (flip elem mods1) mods &&
(null fn || fn == fn1) -> Just (ts,convert pgf cnc t)
(t@(Word _ tag1 _ _):ts)
| tag == tag1 && null mods-> Just (ts,convert pgf cnc t)
_ -> Nothing)
where
(f,_) = readTag (Word "<match>" undefined undefined undefined) tag_spec
Phrase tag mods fn _ _ = f []
many1 f = do
x <- f
xs <- many f
return (x:xs)
many f =
do x <- f
xs <- many f
return (x:xs)
`mplus`
do return []
inside tag_spec p = P (\pgf cnc ts ->
case ts of
(t@(Phrase tag1 mods1 fn1 _ ts'):ts)
| tag == tag1 &&
all (flip elem mods1) mods &&
(null fn || fn == fn1) -> case runP p pgf cnc ts' of
Just ([],x) -> Just (ts,x)
_ -> Nothing
_ -> Nothing)
where
(f,_) = readTag (Word "<match>" undefined undefined undefined) tag_spec
Phrase tag mods fn _ _ = f []
insideOpt convert tag_spec p = P (\pgf cnc ts ->
case ts of
(t@(Phrase tag1 mods1 fn1 _ ts'):ts)
| tag == tag1 &&
all (flip elem mods1) mods &&
(null fn || fn == fn1) -> case runP p pgf cnc ts' of
Just ([],x) -> Just (ts,x)
_ -> Just (ts,convert pgf cnc t)
_ -> Nothing)
where
(f,_) = readTag (Word "<match>" undefined undefined undefined) tag_spec
Phrase tag mods fn _ _ = f []
lemma tag cat an0 = P (\pgf cnc ts ->
case ts of
(t@(Word _ tag1 form _):ts) | tag == tag1 -> case runP (lookupForm cat an0 form) pgf cnc ts of
Nothing -> Just (ts,t)
x -> x
_ -> Nothing)
lookupForm cat an0 form = P (\pgf cnc ts ->
case [f | (f,an,_) <- lookupMorpho cnc form, hasCat pgf f cat, an == an0] of
[] -> case [f | (f,an,_) <- lookupMorpho cnc (map toLower form), hasCat pgf f cat, an == an0] of
[f] -> Just (ts,App f [])
_ -> Nothing
[f] -> Just (ts,App f [])
_ -> Nothing)
where
hasCat pgf f cat =
case functionType pgf f of
(DTyp _ cat1 _) -> cat1 == cat
opt f =
do x <- f
return (Just x)
`mplus`
do return Nothing
word tag = P (\pgf cnc ts ->
case ts of
((Word _ tag1 form _):ts) | tag == tag1 -> Just (ts,form)
_ -> Nothing)
|
