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
51 ss <- (wikiParser <|> return [])
63 pEol = char '\n' <|> do
67 pLinkParser = do try (string "]]" >> return ([],[]))
81 [] -> return (Link l l)
82 _ -> return (Link l d)
84 pBold = pS "**" (\s -> Bold s)
85 pEmph = pS "//" (\s -> Emph s)
86 pUnderline = pS "__" (\s -> Underline s)
87 pStrike = pS "--" (\s -> Strike s)
94 pStopAt xs = pUntil pMain xs
95 pString xs = pUntil anyChar xs
96 pUntil p xs = manyTill p (try $ string xs)
100 level <- many1 $ char '='
102 s <- pStopAt (' ':level)
103 return (Heading (length level) s)
106 proto <- many1 letter
108 s <- many1 (alphaNum <|> oneOf "?.:&-/")
109 return (Url (proto++"://"++s))
113 s <- pString "</pre>"
116 pMain = try (pHeading)
130 c <- oneOf "*,;.:!?[]()'\"=-%$£<>/\\|"
137 newtype PGB = PGB DBService
139 createPGB :: String -> String -> String -> String -> IO PGB
140 createPGB host database user password = let db = createDBService host database "" user password Nothing in return (PGB db)
142 instance Backend PGB where
144 getCurrent (PGB db) key = do
145 result <- selectReturnTuples db $ "SELECT fulltext,timestamp FROM curtexts WHERE keyword="++tov key
147 [text,date]:_ -> return (Just (text,date))
150 getList (PGB db) key = do
151 list <- selectReturnTuples db $ "SELECT id, timestamp, author, comment from fulltexts WHERE keyword = "++tov key
154 _ -> return $ map (\[id,date,author,comment] -> (id,date,author,comment)) list
156 get (PGB db) key id = do
157 list <- selectReturnTuples db $ "SELECT fulltext from fulltexts WHERE id = "++tov id
159 [s]:_ -> return (Just s)
162 setCurrent (PGB db) key id = do
163 full <- selectReturnTuples db $ "SELECT keyword FROM fulltexts WHERE keyword="++tov key++" AND id='"++id++"'"
164 cur <- selectReturnTuples db $ "SELECT keyword FROM curtexts WHERE keyword="++tov key
171 execute db $ "INSERT INTO current (keyword, id) VALUES ("++tov key++","++tov id++")"
173 execute db $ "UPDATE current SET id = "++tov id++" WHERE keyword = "++tov key
174 if rows == 1 then return True
177 update (PGB db) key text author comment = do
178 rows <- execute db $ "INSERT INTO fulltexts (keyword,fulltext, author, comment) VALUES ("++tov key++","++tov text++","++tov author++","++tov comment++")"
179 if rows == 0 then return ""
181 [[id]] <- selectReturnTuples db $ "SELECT currval('fulltexts_id_seq')"
182 setCurrent (PGB db) key id
185 listKeys (PGB db) = do
186 list <- selectReturnTuples db $ "SELECT keyword FROM fulltexts GROUP BY keyword ORDER BY lower(keyword)"
189 _ -> mapM (\[key] -> return key) list
193 tov :: String -> String
194 tov s = '\'':escapeQuery s++"'"
196 toHtml :: [Markup] -> String
198 toHtml ((Paragraph):xs) = "<p>\n"++toHtml xs
199 toHtml ((Text s):xs) = s++toHtml xs
200 toHtml ((Link l d):xs) = "<link: "++l++" desc: "++d++">"++toHtml xs
201 toHtml ((Bold d):xs) = "<b>"++toHtml d++"</b>"++toHtml xs
202 toHtml ((Emph d):xs) = "<em>"++toHtml d++"</em>"++toHtml xs
203 toHtml ((Underline d):xs) = "<u>"++toHtml d++"</u>"++toHtml xs
204 toHtml ((Strike d):xs) = "<strike>"++toHtml d++"</strike>"++toHtml xs
205 toHtml ((Heading n d):xs) = "\n<h"++show n++">"++toHtml d++"</h"++show n++">\n"++toHtml xs
206 toHtml ((Url l):xs) = "<link: "++l++">"++toHtml xs
207 toHtml ((Pre s):xs) = "<pre>"++s++"</pre>"++toHtml xs
210 htmlOutput s = case parse wikiParser "" s of