2 Backend (getCurrent,getList,get,setCurrent,update,listKeys)
5 ,Markup (Text, Paragraph, Link, Bold, Emph, Heading, Url, Underline, Strike, Pre)
14 import Text.ParserCombinators.Parsec
17 --Keyword -> (Full text,date)
18 getCurrent :: a -> String -> IO (Maybe (String,String))
20 --Keyword -> [(id,date,author,comment)]
21 getList :: a -> String -> IO [(String, String, String, String)]
23 --Keyword -> id -> Full text
24 get :: a -> String -> String -> IO (Maybe String)
27 setCurrent :: a -> String -> String -> IO Bool
29 --Keyword -> Full text -> id
30 update :: a -> String -> String -> String -> String -> IO String
33 listKeys :: a -> IO [String]
35 data Markup = Text String
40 | Heading Int [Markup]
46 type Document = [Markup]
48 wikiParser :: GenParser Char st Document
49 wikiParser = many1 pMain
60 pEol = char '\n' <|> do
64 pLinkParser = do try (string "]]" >> return ([],[]))
78 [] -> return (Link l l)
79 _ -> return (Link l d)
81 pBold = pS "**" (\s -> Bold s)
82 pEmph = pS "//" (\s -> Emph s)
83 pUnderline = pS "__" (\s -> Underline s)
84 pStrike = pS "--" (\s -> Strike s)
91 pStopAt xs = pUntil pMain xs
92 pString xs = pUntil anyChar xs
93 pUntil p xs = manyTill p (try $ string xs)
97 level <- many1 $ char '='
99 s <- pStopAt (' ':level)
100 return (Heading (length level) s)
103 proto <- many1 letter
105 s <- many1 (alphaNum <|> oneOf "?.:&-/")
106 return (Url (proto++"://"++s))
110 s <- pString "</pre>"
129 c <- oneOf "*,;.:!?[]()'\"=-%$£<>/\\|"
136 newtype PGB = PGB DBService
138 createPGB :: String -> String -> String -> String -> IO PGB
139 createPGB host database user password = let db = createDBService host database "" user password Nothing in return (PGB db)
141 instance Backend PGB where
143 getCurrent (PGB db) key = do
144 result <- selectReturnTuples db $ "SELECT fulltext,timestamp FROM curtexts WHERE keyword="++tov key
146 [text,date]:_ -> return (Just (text,date))
149 getList (PGB db) key = do
150 list <- selectReturnTuples db $ "SELECT id, timestamp, author, comment from fulltexts WHERE keyword = "++tov key
153 _ -> return $ map (\[id,date,author,comment] -> (id,date,author,comment)) list
155 get (PGB db) key id = do
156 list <- selectReturnTuples db $ "SELECT fulltext from fulltexts WHERE id = "++tov id
158 [s]:_ -> return (Just s)
161 setCurrent (PGB db) key id = do
162 full <- selectReturnTuples db $ "SELECT keyword FROM fulltexts WHERE keyword="++tov key++" AND id='"++id++"'"
163 cur <- selectReturnTuples db $ "SELECT keyword FROM curtexts WHERE keyword="++tov key
170 execute db $ "INSERT INTO current (keyword, id) VALUES ("++tov key++","++tov id++")"
172 execute db $ "UPDATE current SET id = "++tov id++" WHERE keyword = "++tov key
173 if rows == 1 then return True
176 update (PGB db) key text author comment = do
177 rows <- execute db $ "INSERT INTO fulltexts (keyword,fulltext, author, comment) VALUES ("++tov key++","++tov text++","++tov author++","++tov comment++")"
178 if rows == 0 then return ""
180 [[id]] <- selectReturnTuples db $ "SELECT currval('fulltexts_id_seq')"
181 setCurrent (PGB db) key id
184 listKeys (PGB db) = do
185 list <- selectReturnTuples db $ "SELECT keyword FROM current keyword ORDER BY lower(keyword)"
188 _ -> mapM (\[key] -> return key) list
192 tov :: String -> String
193 tov s = '\'':escapeQuery s++"'"
195 toHtml :: [Markup] -> String
197 toHtml ((Paragraph):xs) = "<p>\n"++toHtml xs
198 toHtml ((Text s):xs) = s++toHtml xs
199 toHtml ((Link l d):xs) = "<link: "++l++" desc: "++d++">"++toHtml xs
200 toHtml ((Bold d):xs) = "<b>"++toHtml d++"</b>"++toHtml xs
201 toHtml ((Emph d):xs) = "<em>"++toHtml d++"</em>"++toHtml xs
202 toHtml ((Underline d):xs) = "<u>"++toHtml d++"</u>"++toHtml xs
203 toHtml ((Strike d):xs) = "<strike>"++toHtml d++"</strike>"++toHtml xs
204 toHtml ((Heading n d):xs) = "\n<h"++show n++">"++toHtml d++"</h"++show n++">\n"++toHtml xs
205 toHtml ((Url l):xs) = "<link: "++l++">"++toHtml xs
206 toHtml ((Pre s):xs) = "<pre>"++s++"</pre>"++toHtml xs
209 htmlOutput s = case parse wikiParser "" s of