forked from GitHub/gf-core
640 lines
26 KiB
Haskell
640 lines
26 KiB
Haskell
{-# LANGUAGE ExistentialQuantification, DeriveDataTypeable, ScopedTypeVariables #-}
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-------------------------------------------------
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-- |
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-- Maintainer : Krasimir Angelov
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-- Stability : stable
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-- Portability : portable
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--
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-- This is the Haskell binding to the C run-time system for
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-- loading and interpreting grammars compiled in Portable Grammar Format (PGF).
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-------------------------------------------------
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#include <pgf/pgf.h>
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#include <gu/enum.h>
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#include <gu/exn.h>
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module PGF2 (-- * CId
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CId,
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-- * PGF
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PGF,readPGF,AbsName,abstractName,Cat,startCat,categories,
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-- * Concrete syntax
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ConcName,Concr,languages,parse,
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parseWithHeuristics, parseWithOracle,
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hasLinearization,linearize,linearizeAll,alignWords,
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-- * Types
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Type(..), Hypo, BindType(..), showType, functionType,
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-- * Trees
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Expr,Fun,readExpr,showExpr,mkApp,unApp,mkStr,mkInt,mkFloat,
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graphvizAbstractTree,graphvizParseTree,
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-- * Morphology
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MorphoAnalysis, lookupMorpho, fullFormLexicon,
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-- * Generation
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functions, generateAll,
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-- * Exceptions
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PGFError(..),
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-- * Grammar specific callbacks
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LiteralCallback,literalCallbacks
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) where
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import Prelude hiding (fromEnum)
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import Control.Exception(Exception,throwIO)
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import Control.Monad(forM_)
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import System.IO.Unsafe(unsafePerformIO,unsafeInterleaveIO)
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import PGF2.Expr
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import PGF2.FFI
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import Foreign hiding ( Pool, newPool, unsafePerformIO )
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import Foreign.C
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import Data.Typeable
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import qualified Data.Map as Map
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import Data.IORef
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import Data.Char(isUpper,isSpace)
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import Data.List(isSuffixOf,maximumBy,nub)
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import Data.Function(on)
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-----------------------------------------------------------------------
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-- Functions that take a PGF.
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-- PGF has many Concrs.
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--
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-- A Concr retains its PGF in a field in order to retain a reference to
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-- the foreign pointer in case if the application still has a reference
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-- to Concr but has lost its reference to PGF.
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type AbsName = String -- ^ Name of abstract syntax
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type ConcName = String -- ^ Name of concrete syntax
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readPGF :: FilePath -> IO PGF
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readPGF fpath =
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do pool <- gu_new_pool
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pgf <- withCString fpath $ \c_fpath ->
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withGuPool $ \tmpPl -> do
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exn <- gu_new_exn tmpPl
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pgf <- pgf_read c_fpath pool exn
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failed <- gu_exn_is_raised exn
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if failed
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then do is_errno <- gu_exn_caught exn gu_exn_type_GuErrno
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if is_errno
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then do perrno <- (#peek GuExn, data.data) exn
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errno <- peek perrno
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gu_pool_free pool
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ioError (errnoToIOError "readPGF" (Errno errno) Nothing (Just fpath))
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else do gu_pool_free pool
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throwIO (PGFError "The grammar cannot be loaded")
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else return pgf
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master <- newForeignPtr gu_pool_finalizer pool
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return PGF {pgf = pgf, pgfMaster = master}
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languages :: PGF -> Map.Map ConcName Concr
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languages p =
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unsafePerformIO $
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do ref <- newIORef Map.empty
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allocaBytes (#size GuMapItor) $ \itor ->
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do fptr <- wrapMapItorCallback (getLanguages ref)
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(#poke GuMapItor, fn) itor fptr
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pgf_iter_languages (pgf p) itor nullPtr
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freeHaskellFunPtr fptr
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readIORef ref
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where
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getLanguages :: IORef (Map.Map String Concr) -> MapItorCallback
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getLanguages ref itor key value exn = do
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langs <- readIORef ref
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name <- peekCString (castPtr key)
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concr <- fmap (\ptr -> Concr ptr p) $ peek (castPtr value)
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writeIORef ref $! Map.insert name concr langs
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generateAll :: PGF -> Cat -> [(Expr,Float)]
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generateAll p cat =
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unsafePerformIO $
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do genPl <- gu_new_pool
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exprPl <- gu_new_pool
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enum <- withCString cat $ \cat -> do
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exn <- gu_new_exn genPl
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pgf_generate_all (pgf p) cat exn genPl exprPl
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genFPl <- newForeignPtr gu_pool_finalizer genPl
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exprFPl <- newForeignPtr gu_pool_finalizer exprPl
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fromPgfExprEnum enum genFPl (p,exprFPl)
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abstractName :: PGF -> AbsName
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abstractName p = unsafePerformIO (peekCString =<< pgf_abstract_name (pgf p))
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startCat :: PGF -> Cat
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startCat p = unsafePerformIO (peekCString =<< pgf_start_cat (pgf p))
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loadConcr :: Concr -> FilePath -> IO ()
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loadConcr c fpath =
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withCString fpath $ \c_fpath ->
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withCString "rb" $ \c_mode ->
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withGuPool $ \tmpPl -> do
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file <- fopen c_fpath c_mode
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inp <- gu_file_in file tmpPl
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exn <- gu_new_exn tmpPl
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pgf_concrete_load (concr c) inp exn
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failed <- gu_exn_is_raised exn
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if failed
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then do is_errno <- gu_exn_caught exn gu_exn_type_GuErrno
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if is_errno
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then do perrno <- (#peek GuExn, data.data) exn
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errno <- peek perrno
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ioError (errnoToIOError "loadConcr" (Errno errno) Nothing (Just fpath))
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else do throwIO (PGFError "The language cannot be loaded")
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else return ()
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unloadConcr :: Concr -> IO ()
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unloadConcr c = pgf_concrete_unload (concr c)
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functionType :: PGF -> CId -> Type
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functionType p fn =
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unsafePerformIO $
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withCString fn $ \c_fn -> do
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c_type <- pgf_function_type (pgf p) c_fn
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peekType c_type
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where
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peekType c_type = do
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cid <- (#peek PgfType, cid) c_type >>= peekCString
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c_hypos <- (#peek PgfType, hypos) c_type
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n_hypos <- (#peek GuSeq, len) c_hypos
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hs <- peekHypos (c_hypos `plusPtr` (#offset GuSeq, data)) 0 n_hypos
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n_exprs <- (#peek PgfType, n_exprs) c_type
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es <- peekExprs (c_type `plusPtr` (#offset PgfType, exprs)) 0 n_exprs
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return (DTyp hs cid es)
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peekHypos :: Ptr a -> Int -> Int -> IO [Hypo]
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peekHypos c_hypo i n
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| i < n = do cid <- (#peek PgfHypo, cid) c_hypo >>= peekCString
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ty <- (#peek PgfHypo, type) c_hypo >>= peekType
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bt <- fmap toBindType ((#peek PgfHypo, bind_type) c_hypo)
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hs <- peekHypos (plusPtr c_hypo (#size PgfHypo)) (i+1) n
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return ((bt,cid,ty) : hs)
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| otherwise = return []
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toBindType :: Int -> BindType
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toBindType (#const PGF_BIND_TYPE_EXPLICIT) = Explicit
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toBindType (#const PGF_BIND_TYPE_IMPLICIT) = Implicit
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peekExprs ptr i n
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| i < n = do e <- peekElemOff ptr i
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es <- peekExprs ptr (i+1) n
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return (Expr e p : es)
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| otherwise = return []
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-----------------------------------------------------------------------------
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-- Graphviz
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graphvizAbstractTree :: PGF -> Expr -> String
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graphvizAbstractTree p e =
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unsafePerformIO $
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withGuPool $ \tmpPl ->
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do (sb,out) <- newOut tmpPl
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exn <- gu_new_exn tmpPl
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pgf_graphviz_abstract_tree (pgf p) (expr e) out exn
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s <- gu_string_buf_freeze sb tmpPl
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peekCString s
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graphvizParseTree :: Concr -> Expr -> String
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graphvizParseTree c e =
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unsafePerformIO $
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withGuPool $ \tmpPl ->
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do (sb,out) <- newOut tmpPl
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exn <- gu_new_exn tmpPl
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pgf_graphviz_parse_tree (concr c) (expr e) out exn
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s <- gu_string_buf_freeze sb tmpPl
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peekCString s
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-----------------------------------------------------------------------------
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-- Functions using Concr
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-- Morpho analyses, parsing & linearization
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type MorphoAnalysis = (Fun,String,Float)
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lookupMorpho :: Concr -> String -> [MorphoAnalysis]
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lookupMorpho (Concr concr master) sent = unsafePerformIO $
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do ref <- newIORef []
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allocaBytes (#size PgfMorphoCallback) $ \cback ->
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do fptr <- wrapLookupMorphoCallback (getAnalysis ref)
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(#poke PgfMorphoCallback, callback) cback fptr
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withCString sent $ \c_sent ->
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pgf_lookup_morpho concr c_sent cback nullPtr
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freeHaskellFunPtr fptr
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readIORef ref
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fullFormLexicon :: Concr -> [(String, [MorphoAnalysis])]
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fullFormLexicon lang =
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unsafePerformIO $
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do pl <- gu_new_pool
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enum <- pgf_fullform_lexicon (concr lang) pl
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fpl <- newForeignPtr gu_pool_finalizer pl
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fromFullFormEntry enum fpl
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where
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fromFullFormEntry :: Ptr GuEnum -> ForeignPtr GuPool -> IO [(String, [MorphoAnalysis])]
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fromFullFormEntry enum fpl =
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do ffEntry <- alloca $ \ptr ->
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withForeignPtr fpl $ \pl ->
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do gu_enum_next enum ptr pl
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peek ptr
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if ffEntry == nullPtr
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then do finalizeForeignPtr fpl
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return []
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else do tok <- peekCString =<< pgf_fullform_get_string ffEntry
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ref <- newIORef []
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allocaBytes (#size PgfMorphoCallback) $ \cback ->
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do fptr <- wrapLookupMorphoCallback (getAnalysis ref)
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(#poke PgfMorphoCallback, callback) cback fptr
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pgf_fullform_get_analyses ffEntry cback nullPtr
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ans <- readIORef ref
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toks <- unsafeInterleaveIO (fromFullFormEntry enum fpl)
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return ((tok,ans) : toks)
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getAnalysis :: IORef [MorphoAnalysis] -> LookupMorphoCallback
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getAnalysis ref self c_lemma c_anal prob exn = do
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ans <- readIORef ref
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lemma <- peekCString c_lemma
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anal <- peekCString c_anal
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writeIORef ref ((lemma, anal, prob):ans)
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parse :: Concr -> Cat -> String -> Either String [(Expr,Float)]
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parse lang cat sent = parseWithHeuristics lang cat sent (-1.0) []
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parseWithHeuristics :: Concr -- ^ the language with which we parse
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-> Cat -- ^ the start category
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-> String -- ^ the input sentence
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-> Double -- ^ the heuristic factor.
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-- A negative value tells the parser
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-- to lookup up the default from
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-- the grammar flags
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-> [(Cat, Int -> String -> Int -> Maybe (Expr,Float,Int))]
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-- ^ a list of callbacks for literal categories.
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-- The arguments of the callback are:
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-- the index of the constituent for the literal category;
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-- the input sentence; the current offset in the sentence.
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-- If a literal has been recognized then the output should
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-- be Just (expr,probability,end_offset)
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-> Either String [(Expr,Float)]
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parseWithHeuristics lang cat sent heuristic callbacks =
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unsafePerformIO $
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do parsePl <- gu_new_pool
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exprPl <- gu_new_pool
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exn <- gu_new_exn parsePl
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enum <- withCString cat $ \cat ->
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withCString sent $ \sent -> do
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callbacks_map <- mkCallbacksMap (concr lang) callbacks parsePl
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pgf_parse_with_heuristics (concr lang) cat sent heuristic callbacks_map exn parsePl exprPl
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failed <- gu_exn_is_raised exn
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if failed
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then do is_parse_error <- gu_exn_caught exn gu_exn_type_PgfParseError
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if is_parse_error
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then do c_tok <- (#peek GuExn, data.data) exn
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tok <- peekCString c_tok
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gu_pool_free parsePl
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gu_pool_free exprPl
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return (Left tok)
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else do is_exn <- gu_exn_caught exn gu_exn_type_PgfExn
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if is_exn
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then do c_msg <- (#peek GuExn, data.data) exn
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msg <- peekCString c_msg
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gu_pool_free parsePl
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gu_pool_free exprPl
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throwIO (PGFError msg)
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else do gu_pool_free parsePl
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gu_pool_free exprPl
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throwIO (PGFError "Parsing failed")
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else do parseFPl <- newForeignPtr gu_pool_finalizer parsePl
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exprFPl <- newForeignPtr gu_pool_finalizer exprPl
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exprs <- fromPgfExprEnum enum parseFPl (lang,exprFPl)
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return (Right exprs)
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mkCallbacksMap :: Ptr PgfConcr -> [(String, Int -> String -> Int -> Maybe (Expr,Float,Int))] -> Ptr GuPool -> IO (Ptr PgfCallbacksMap)
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mkCallbacksMap concr callbacks pool = do
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callbacks_map <- pgf_new_callbacks_map concr pool
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forM_ callbacks $ \(cat,match) ->
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withCString cat $ \ccat -> do
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match <- wrapLiteralMatchCallback (match_callback match)
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predict <- wrapLiteralPredictCallback predict_callback
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hspgf_callbacks_map_add_literal concr callbacks_map ccat match predict pool
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return callbacks_map
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where
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match_callback match _ clin_idx csentence poffset out_pool = do
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sentence <- peekCString csentence
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coffset <- peek poffset
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case match (fromIntegral clin_idx) sentence (fromIntegral coffset) of
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Nothing -> return nullPtr
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Just (e,prob,offset') -> do poke poffset (fromIntegral offset')
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-- here we copy the expression to out_pool
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c_e <- withGuPool $ \tmpPl -> do
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exn <- gu_new_exn tmpPl
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(sb,out) <- newOut tmpPl
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let printCtxt = nullPtr
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pgf_print_expr (expr e) printCtxt 1 out exn
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c_str <- gu_string_buf_freeze sb tmpPl
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guin <- gu_string_in c_str tmpPl
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pgf_read_expr guin out_pool exn
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ep <- gu_malloc out_pool (#size PgfExprProb)
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(#poke PgfExprProb, expr) ep c_e
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(#poke PgfExprProb, prob) ep prob
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return ep
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predict_callback _ _ _ _ = return nullPtr
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-- | The oracle is a triple of functions.
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-- The first two take a category name and a linearization field name
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-- and they should return True/False when the corresponding
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-- prediction or completion is appropriate. The third function
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-- is the oracle for literals.
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type Oracle = (Maybe (Cat -> String -> Int -> Bool)
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,Maybe (Cat -> String -> Int -> Bool)
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,Maybe (Cat -> String -> Int -> Maybe (Expr,Float,Int))
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)
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parseWithOracle :: Concr -- ^ the language with which we parse
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-> Cat -- ^ the start category
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-> String -- ^ the input sentence
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-> Oracle
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-> Either String [(Expr,Float)]
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parseWithOracle lang cat sent (predict,complete,literal) =
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unsafePerformIO $
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do parsePl <- gu_new_pool
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exprPl <- gu_new_pool
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exn <- gu_new_exn parsePl
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enum <- withCString cat $ \cat ->
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withCString sent $ \sent -> do
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predictPtr <- maybe (return nullFunPtr) (wrapOracleCallback . oracleWrapper) predict
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completePtr <- maybe (return nullFunPtr) (wrapOracleCallback . oracleWrapper) complete
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literalPtr <- maybe (return nullFunPtr) (wrapOracleLiteralCallback . oracleLiteralWrapper) literal
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cback <- hspgf_new_oracle_callback sent predictPtr completePtr literalPtr parsePl
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pgf_parse_with_oracle (concr lang) cat sent cback exn parsePl exprPl
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failed <- gu_exn_is_raised exn
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if failed
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then do is_parse_error <- gu_exn_caught exn gu_exn_type_PgfParseError
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if is_parse_error
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then do c_tok <- (#peek GuExn, data.data) exn
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tok <- peekCString c_tok
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gu_pool_free parsePl
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gu_pool_free exprPl
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return (Left tok)
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else do is_exn <- gu_exn_caught exn gu_exn_type_PgfExn
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if is_exn
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then do c_msg <- (#peek GuExn, data.data) exn
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msg <- peekCString c_msg
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gu_pool_free parsePl
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gu_pool_free exprPl
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throwIO (PGFError msg)
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else do gu_pool_free parsePl
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gu_pool_free exprPl
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throwIO (PGFError "Parsing failed")
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else do parseFPl <- newForeignPtr gu_pool_finalizer parsePl
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exprFPl <- newForeignPtr gu_pool_finalizer exprPl
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exprs <- fromPgfExprEnum enum parseFPl (lang,exprFPl)
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return (Right exprs)
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where
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oracleWrapper oracle catPtr lblPtr offset = do
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cat <- peekCString catPtr
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lbl <- peekCString lblPtr
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return (oracle cat lbl (fromIntegral offset))
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oracleLiteralWrapper oracle catPtr lblPtr poffset out_pool = do
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cat <- peekCString catPtr
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lbl <- peekCString lblPtr
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offset <- peek poffset
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case oracle cat lbl (fromIntegral offset) of
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Just (e,prob,offset) ->
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do poke poffset (fromIntegral offset)
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-- here we copy the expression to out_pool
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c_e <- withGuPool $ \tmpPl -> do
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exn <- gu_new_exn tmpPl
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(sb,out) <- newOut tmpPl
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let printCtxt = nullPtr
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pgf_print_expr (expr e) printCtxt 1 out exn
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c_str <- gu_string_buf_freeze sb tmpPl
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guin <- gu_string_in c_str tmpPl
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pgf_read_expr guin out_pool exn
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ep <- gu_malloc out_pool (#size PgfExprProb)
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(#poke PgfExprProb, expr) ep c_e
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(#poke PgfExprProb, prob) ep prob
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return ep
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Nothing -> do return nullPtr
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hasLinearization :: Concr -> Fun -> Bool
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hasLinearization lang id = unsafePerformIO $
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withCString id (pgf_has_linearization (concr lang))
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linearize :: Concr -> Expr -> String
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linearize lang e = unsafePerformIO $
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withGuPool $ \pl ->
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do (sb,out) <- newOut pl
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exn <- gu_new_exn pl
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pgf_linearize (concr lang) (expr e) out exn
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failed <- gu_exn_is_raised exn
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if failed
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then do is_nonexist <- gu_exn_caught exn gu_exn_type_PgfLinNonExist
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if is_nonexist
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then return ""
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else do is_exn <- gu_exn_caught exn gu_exn_type_PgfExn
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if is_exn
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then do c_msg <- (#peek GuExn, data.data) exn
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msg <- peekCString c_msg
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throwIO (PGFError msg)
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else throwIO (PGFError "The abstract tree cannot be linearized")
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else do lin <- gu_string_buf_freeze sb pl
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peekCString lin
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linearizeAll :: Concr -> Expr -> [String]
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linearizeAll lang e = unsafePerformIO $
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do pl <- gu_new_pool
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exn <- gu_new_exn pl
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cts <- pgf_lzr_concretize (concr lang) (expr e) exn pl
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failed <- gu_exn_is_raised exn
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if failed
|
|
then throwExn exn pl
|
|
else collect cts exn pl
|
|
where
|
|
collect cts exn pl = withGuPool $ \tmpPl -> do
|
|
ctree <- alloca $ \ptr -> do gu_enum_next cts ptr tmpPl
|
|
peek ptr
|
|
if ctree == nullPtr
|
|
then do gu_pool_free pl
|
|
return []
|
|
else do (sb,out) <- newOut tmpPl
|
|
ctree <- pgf_lzr_wrap_linref ctree tmpPl
|
|
pgf_lzr_linearize_simple (concr lang) ctree 0 out exn tmpPl
|
|
failed <- gu_exn_is_raised exn
|
|
if failed
|
|
then do is_nonexist <- gu_exn_caught exn gu_exn_type_PgfLinNonExist
|
|
if is_nonexist
|
|
then collect cts exn pl
|
|
else throwExn exn pl
|
|
else do lin <- gu_string_buf_freeze sb tmpPl
|
|
s <- peekCString lin
|
|
ss <- unsafeInterleaveIO (collect cts exn pl)
|
|
return (s:ss)
|
|
|
|
throwExn exn pl = do
|
|
is_exn <- gu_exn_caught exn gu_exn_type_PgfExn
|
|
if is_exn
|
|
then do c_msg <- (#peek GuExn, data.data) exn
|
|
msg <- peekCString c_msg
|
|
gu_pool_free pl
|
|
throwIO (PGFError msg)
|
|
else do gu_pool_free pl
|
|
throwIO (PGFError "The abstract tree cannot be linearized")
|
|
|
|
alignWords :: Concr -> Expr -> [(String, [Int])]
|
|
alignWords lang e = unsafePerformIO $
|
|
withGuPool $ \pl ->
|
|
do exn <- gu_new_exn pl
|
|
seq <- pgf_align_words (concr lang) (expr e) exn pl
|
|
failed <- gu_exn_is_raised exn
|
|
if failed
|
|
then do is_nonexist <- gu_exn_caught exn gu_exn_type_PgfLinNonExist
|
|
if is_nonexist
|
|
then return []
|
|
else do is_exn <- gu_exn_caught exn gu_exn_type_PgfExn
|
|
if is_exn
|
|
then do c_msg <- (#peek GuExn, data.data) exn
|
|
msg <- peekCString c_msg
|
|
throwIO (PGFError msg)
|
|
else throwIO (PGFError "The abstract tree cannot be linearized")
|
|
else do len <- (#peek GuSeq, len) seq
|
|
arr <- peekArray (fromIntegral (len :: CInt)) (seq `plusPtr` (#offset GuSeq, data))
|
|
mapM peekAlignmentPhrase arr
|
|
where
|
|
peekAlignmentPhrase :: Ptr () -> IO (String, [Int])
|
|
peekAlignmentPhrase ptr = do
|
|
c_phrase <- (#peek PgfAlignmentPhrase, phrase) ptr
|
|
phrase <- peekCString c_phrase
|
|
n_fids <- (#peek PgfAlignmentPhrase, n_fids) ptr
|
|
(fids :: [CInt]) <- peekArray (fromIntegral (n_fids :: CInt)) (ptr `plusPtr` (#offset PgfAlignmentPhrase, fids))
|
|
return (phrase, map fromIntegral fids)
|
|
|
|
functions :: PGF -> [Fun]
|
|
functions p =
|
|
unsafePerformIO $
|
|
withGuPool $ \tmpPl ->
|
|
allocaBytes (#size GuMapItor) $ \itor -> do
|
|
exn <- gu_new_exn tmpPl
|
|
ref <- newIORef []
|
|
fptr <- wrapMapItorCallback (getFunctions ref)
|
|
(#poke GuMapItor, fn) itor fptr
|
|
pgf_iter_functions (pgf p) itor exn
|
|
freeHaskellFunPtr fptr
|
|
fs <- readIORef ref
|
|
return (reverse fs)
|
|
where
|
|
getFunctions :: IORef [String] -> MapItorCallback
|
|
getFunctions ref itor key value exn = do
|
|
names <- readIORef ref
|
|
name <- peekCString (castPtr key)
|
|
writeIORef ref $! (name : names)
|
|
|
|
categories :: PGF -> [Cat]
|
|
categories pgf = -- !!! quick hack
|
|
nub [cat | f<-functions pgf, let DTyp _ cat _=functionType pgf f]
|
|
|
|
categoryContext :: PGF -> Cat -> Maybe [Hypo]
|
|
categoryContext pgf cat = Nothing -- !!! not implemented yet TODO
|
|
|
|
-----------------------------------------------------------------------------
|
|
-- Helper functions
|
|
|
|
fromPgfExprEnum :: Ptr GuEnum -> ForeignPtr GuPool -> a -> IO [(Expr, Float)]
|
|
fromPgfExprEnum enum fpl master =
|
|
do pgfExprProb <- alloca $ \ptr ->
|
|
withForeignPtr fpl $ \pl ->
|
|
do gu_enum_next enum ptr pl
|
|
peek ptr
|
|
if pgfExprProb == nullPtr
|
|
then do finalizeForeignPtr fpl
|
|
return []
|
|
else do expr <- (#peek PgfExprProb, expr) pgfExprProb
|
|
ts <- unsafeInterleaveIO (fromPgfExprEnum enum fpl master)
|
|
prob <- (#peek PgfExprProb, prob) pgfExprProb
|
|
return ((Expr expr master,prob) : ts)
|
|
|
|
-----------------------------------------------------------------------
|
|
-- Exceptions
|
|
|
|
newtype PGFError = PGFError String
|
|
deriving (Show, Typeable)
|
|
|
|
instance Exception PGFError
|
|
|
|
-----------------------------------------------------------------------
|
|
|
|
type LiteralCallback =
|
|
PGF -> (ConcName,Concr) -> Int -> String -> Int -> Maybe (Expr,Float,Int)
|
|
|
|
-- | Callbacks for the App grammar
|
|
literalCallbacks :: [(AbsName,[(Cat,LiteralCallback)])]
|
|
literalCallbacks = [("App",[("PN",nerc),("Symb",chunk)])]
|
|
|
|
-- | Named entity recognition for the App grammar
|
|
-- (based on ../java/org/grammaticalframework/pgf/NercLiteralCallback.java)
|
|
nerc :: LiteralCallback
|
|
nerc pgf (lang,concr) lin_idx sentence offset =
|
|
case consume capitalized (drop offset sentence) of
|
|
(capwords@(_:_),rest) |
|
|
not ("Eng" `isSuffixOf` lang && name `elem` ["I","I'm"]) ->
|
|
if null ls
|
|
then pn
|
|
else case cat of
|
|
"PN" -> retLit (mkApp lemma [])
|
|
"WeekDay" -> retLit (mkApp "weekdayPN" [mkApp lemma []])
|
|
"Month" -> retLit (mkApp "monthPN" [mkApp lemma []])
|
|
_ -> Nothing
|
|
where
|
|
retLit e = Just (e,0,end_offset)
|
|
where end_offset = offset+length name
|
|
pn = retLit (mkApp "SymbPN" [mkApp "MkSymb" [mkStr name]])
|
|
((lemma,cat),_) = maximumBy (compare `on` snd) (reverse ls)
|
|
ls = [((fun,cat),p)
|
|
|(fun,_,p)<-lookupMorpho concr name,
|
|
let cat=functionCat fun,
|
|
cat/="Nationality"]
|
|
name = trimRight (concat capwords)
|
|
_ -> Nothing
|
|
where
|
|
-- | Variant of unfoldr
|
|
consume munch xs =
|
|
case munch xs of
|
|
Nothing -> ([],xs)
|
|
Just (y,xs') -> (y:ys,xs'')
|
|
where (ys,xs'') = consume munch xs'
|
|
|
|
functionCat f = case functionType pgf f of DTyp _ cat _ -> cat
|
|
|
|
-- | Callback to parse arbitrary words as chunks (from
|
|
-- ../java/org/grammaticalframework/pgf/UnknownLiteralCallback.java)
|
|
chunk :: LiteralCallback
|
|
chunk _ (_,concr) lin_idx sentence offset =
|
|
case uncapitalized (drop offset sentence) of
|
|
Just (word0@(_:_),rest) | null (lookupMorpho concr word) ->
|
|
Just (expr,0,offset+length word)
|
|
where
|
|
word = trimRight word0
|
|
expr = mkApp "MkSymb" [mkStr word]
|
|
_ -> Nothing
|
|
|
|
|
|
-- More helper functions
|
|
|
|
trimRight = reverse . dropWhile isSpace . reverse
|
|
|
|
capitalized = capitalized' isUpper
|
|
uncapitalized = capitalized' (not.isUpper)
|
|
|
|
capitalized' test s@(c:_) | test c =
|
|
case span (not.isSpace) s of
|
|
(name,rest1) ->
|
|
case span isSpace rest1 of
|
|
(space,rest2) -> Just (name++space,rest2)
|
|
capitalized' not s = Nothing
|