2 Backend (getCurrent,getList,get,setCurrent,update)
5 ,Markup (Text, Paragraph, Link, Bold, Emph, Heading, Url, Underline, Strike)
13 import Text.ParserCombinators.Parsec
16 --Keyword -> (Full text,date)
17 getCurrent :: a -> String -> IO (Maybe (String,String))
19 --Keyword -> [(id,date,author,comment)]
20 getList :: a -> String -> IO [(String, String, String, String)]
22 --Keyword -> id -> Full text
23 get :: a -> String -> String -> IO (Maybe String)
26 setCurrent :: a -> String -> String -> IO Bool
28 --Keyword -> Full text -> id
29 update :: a -> String -> String -> String -> String -> IO String
31 data Markup = Text String
36 | Heading Int [Markup]
41 type Document = [Markup]
43 wikiParser :: GenParser Char st Document
46 ss <- (wikiParser <|> return [])
59 pEol = char '\n' <|> do
63 pLinkParser = do try (string "]]" >> return ([],[]))
77 [] -> return (Link l l)
78 _ -> return (Link l d)
82 s <- pStringParser "**"
87 s <- pStringParser "//"
92 s <- pStringParser "__"
97 s <- pStringParser "--"
100 pStringParser xs = do
101 try (string xs >> return []) <|> (do
103 ss <- pStringParser xs
107 try (string xs >> return []) <|> (do
114 level <- many1 $ char '='
116 s <- pStringParser (' ':level)
117 return (Heading (length level) s)
120 proto <- many1 letter
122 s <- many1 (alphaNum <|> oneOf "?.:&-/")
123 return (Url (proto++"://"++s))
125 pMain = try (pHeading)
138 c <- oneOf "*,;.:!?[]()'\"=-%$£<>/\\|"
142 t <- many1 alphaNum--(noneOf ['\n','\r','[',']'])
146 newtype PGB = PGB DBService
148 createPGB :: String -> String -> String -> String -> IO PGB
149 createPGB host database user password = let db = createDBService host database "" user password Nothing in return (PGB db)
152 testDB = createPGB "wave" "wiki" "wiki" "12wiki34db"
154 instance Backend PGB where
156 getCurrent (PGB db) key = do
157 result <- selectReturnTuples db $ "SELECT fulltext,timestamp FROM curtexts WHERE keyword="++tov key
159 [text,date]:_ -> return (Just (text,date))
162 getList (PGB db) key = do
163 list <- selectReturnTuples db $ "SELECT id, timestamp, author, comment from fulltexts WHERE keyword = "++tov key
166 _ -> return $ map (\[id,date,author,comment] -> (id,date,author,comment)) list
168 get (PGB db) key id = do
169 list <- selectReturnTuples db $ "SELECT fulltext from fulltexts WHERE id = "++tov id
171 [s]:_ -> return (Just s)
174 setCurrent (PGB db) key id = do
175 full <- selectReturnTuples db $ "SELECT keyword FROM fulltexts WHERE keyword="++tov key++" AND id='"++id++"'"
176 cur <- selectReturnTuples db $ "SELECT keyword FROM curtexts WHERE keyword="++tov key
183 execute db $ "INSERT INTO current (keyword, id) VALUES ("++tov key++","++tov id++")"
185 execute db $ "UPDATE current SET id = "++tov id++" WHERE keyword = "++tov key
186 if rows == 1 then return True
189 update (PGB db) key text author comment = do
190 rows <- execute db $ "INSERT INTO fulltexts (keyword,fulltext, author, comment) VALUES ("++tov key++","++tov text++","++tov author++","++tov comment++")"
191 if rows == 0 then return ""
193 [[id]] <- selectReturnTuples db $ "SELECT currval('fulltexts_id_seq')"
194 setCurrent (PGB db) key id
198 tov :: String -> String
199 tov s = '\'':escapeQuery s++"'"