2 Backend (getCurrent,getList,get,setCurrent,update)
5 ,Markup (Text, Paragraph, Link, Bold, Emph)
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
37 type Document = [Markup]
39 wikiParser :: GenParser Char st Document
42 ss <- (wikiParser <|> return [])
55 pEol = char '\n' <|> do
61 l <- many1 $ noneOf ['|']
63 d <- many1 $ noneOf "]"
69 l <- many1 $ noneOf "]"
75 s <- pStringParser "**"
80 s <- pStringParser "//"
84 (string xs >> return []) <|> (do
86 ss <- pStringParser xs
99 c <- oneOf "*,;.:!?[]()'\"=-%$£<>/\\|"
103 t <- many1 alphaNum--(noneOf ['\n','\r','[',']'])
107 newtype PGB = PGB DBService
109 createPGB :: String -> String -> String -> String -> IO PGB
110 createPGB host database user password = let db = createDBService host database "" user password Nothing in return (PGB db)
113 testDB = createPGB "wave" "wiki" "wiki" "12wiki34db"
115 instance Backend PGB where
117 getCurrent (PGB db) key = do
118 result <- selectReturnTuples db $ "SELECT fulltext,timestamp FROM curtexts WHERE keyword="++tov key
120 [text,date]:_ -> return (Just (text,date))
123 getList (PGB db) key = do
124 list <- selectReturnTuples db $ "SELECT id, timestamp, author, comment from fulltexts WHERE keyword = "++tov key
125 return $ map (\[id,date,author,comment] -> (id,date,author,comment)) list
127 get (PGB db) key id = do
128 list <- selectReturnTuples db $ "SELECT fulltext from fulltexts WHERE id = "++tov id
130 [s]:_ -> return (Just s)
133 setCurrent (PGB db) key id = do
134 full <- selectReturnTuples db $ "SELECT keyword FROM fulltexts WHERE keyword="++tov key++" AND id='"++id++"'"
135 cur <- selectReturnTuples db $ "SELECT keyword FROM curtexts WHERE keyword="++tov key
142 execute db $ "INSERT INTO current (keyword, id) VALUES ("++tov key++","++tov id++")"
144 execute db $ "UPDATE current SET id = "++tov id++" WHERE keyword = "++tov key
145 if rows == 1 then return True
148 update (PGB db) key text author comment = do
149 rows <- execute db $ "INSERT INTO fulltexts (keyword,fulltext, author, comment) VALUES ("++tov key++","++tov text++","++tov author++","++tov comment++")"
150 if rows == 0 then return ""
152 [[id]] <- selectReturnTuples db $ "SELECT currval('fulltexts_id_seq')"
153 setCurrent (PGB db) key id
157 tov :: String -> String
158 tov s = '\'':escapeQuery s++"'"