+
+-- | We put the 'XmlTree' argument last so that it's easy to eta
+-- reduce all of the import_foo functions that call this.
+--
+import_generic :: (XmlPickler a, PersistEntity b)
+ => b -- ^ Dummy Listing instance needed for 'migrate'
+ -> (a -> [b]) -- ^ listings getter
+ -> XmlTree
+ -> IO (Maybe Int) -- ^ Return the number of records inserted.
+import_generic dummy g xml =
+ withSqliteConn "foo.sqlite3" $ runDbConn $ do
+ runMigration defaultMigrationLogger $ do
+ migrate dummy
+ let root_element = unpickleDoc xpickle xml
+ case root_element of
+ Nothing -> do
+ let msg = "Could not unpickle document in import_generic."
+ liftIO $ report_error msg
+ return Nothing
+ Just elt -> do
+ ids <- mapM (\l -> insert l) (g elt)
+ return $ Just (length ids)
+
+-- | Import TSN.Injuries from an 'XmlTree'.
+import_injuries :: XmlTree -> IO (Maybe Int)
+import_injuries =
+ import_generic
+ (undefined :: Injuries.Listing)
+ Injuries.listings
+
+-- | Import TSN.InjuriesDetail from an 'XmlTree'.
+import_injuries_detail :: XmlTree -> IO (Maybe Int)
+import_injuries_detail =
+ import_generic
+ (undefined :: InjuriesDetail.PlayerListing)
+ ( (concatMap InjuriesDetail.player_listings) . InjuriesDetail.listings)
+
+import_file :: FilePath -> IO ()
+import_file path = do
+ results <- catchIOError
+ parse_and_import
+ (\e -> do
+ report_error (show e)
+ report_error $ "Failed to import file " ++ path ++ "."
+ -- Return a nonempty list so we don't claim incorrectly that
+ -- we couldn't parse the DTD.
+ return [ Nothing ] )
+
+ case results of
+ -- If results' is empty, one of the arrows return "nothing."
+ [] -> report_error $ "Unable to determine DTD for file " ++ path ++ "."
+ (r:_) ->
+ case r of
+ Nothing -> return ()
+ Just cnt -> report_info $ "Successfully imported " ++
+ (show cnt) ++
+ " records from " ++ path ++ "."
+ where
+ -- | An arrow that reads a document into an 'XmlTree'.
+ readA :: IOStateArrow s a XmlTree
+ readA = readDocument parse_opts path
+
+ -- | An arrow which parses the doctype "SYSTEM" of an 'XmlTree'.
+ -- We use these to determine the parser to use.
+ doctypeA :: ArrowXml a => a XmlTree String
+ doctypeA = getAttrl >>> hasName "doctype-SYSTEM" /> getText
+
+ -- | Combine the arrows above as well as the function below
+ -- (arrowized with 'arr') into an IO action that does everything
+ -- (parses and then runs the import on what was parsed).
+ --
+ -- The result of runX has type IO [IO (Maybe Int)]. We thus use
+ -- bind (>>=) and sequence to combine all of the IOs into one
+ -- big one outside of the list.
+ parse_and_import :: IO [Maybe Int]
+ parse_and_import =
+ (runX $ readA >>> (doctypeA &&& returnA) >>> (arr import_with_dtd))
+ >>=
+ sequence
+
+ -- | Takes a 'Doctype', 'XmlTree' pair and uses the 'Doctype' to
+ -- determine which function to call on the 'XmlTree'.
+ import_with_dtd :: (String, XmlTree) -> IO (Maybe Int)
+ import_with_dtd (dtd,xml)
+ | dtd == "injuriesxml.dtd" = import_injuries xml
+ | dtd == "Injuries_Detail_XML.dtd" = import_injuries_detail xml
+ | otherwise = do
+ report_info $ "Unrecognized DTD in " ++ path ++ ": " ++ dtd ++ "."
+ return Nothing