module Wiki (
- Backend
+ Backend (getCurrent,getList,get,setCurrent,update,listKeys)
,PGB
+ ,createPGB
+ ,Markup (Text, Paragraph, Link, Bold, Emph, Heading, Url, Underline, Strike, Pre)
+ ,Document
+ ,wikiParser
+ ,htmlOutput
) where
import Dbconnect
import Data.Char
+import Text.ParserCombinators.Parsec
class Backend a where
--Keyword -> (Full text,date)
getList :: a -> String -> IO [(String, String, String, String)]
--Keyword -> id -> Full text
- get :: a -> String -> String -> IO String
+ get :: a -> String -> String -> IO (Maybe String)
--Keyword -> id -> ()
setCurrent :: a -> String -> String -> IO Bool
--Keyword -> Full text -> id
update :: a -> String -> String -> String -> String -> IO String
+ --[Keyword]
+ listKeys :: a -> IO [String]
+
data Markup = Text String
- | Bold String
- | Paragraph [Markup]
+ | Paragraph
+ | Link String String
+ | Bold [Markup]
+ | Emph [Markup]
+ | Heading Int [Markup]
+ | Url String
+ | Underline [Markup]
+ | Strike [Markup]
+ | Pre String
type Document = [Markup]
+wikiParser :: GenParser Char st Document
+wikiParser = do
+ s <- pMain
+ ss <- (wikiParser <|> return [])
+ return (s:ss)
+
+pPara = do
+ pEol
+ pEol
+ return (Paragraph)
+
+
+pSpace = do
+ space
+ return (Text " ")
+
+pEol = char '\n' <|> do
+ char '\r'
+ char '\n'
+
+pLinkParser = do try (string "]]" >> return ([],[]))
+ <|> try (do
+ string " | "
+ d <- pString "]]"
+ return ([],d))
+ <|> (do
+ c <- anyChar
+ (l,d) <- pLinkParser
+ return (c:l,d))
+
+pLink = do
+ string "[["
+ (l,d) <- pLinkParser
+ case d of
+ [] -> return (Link l l)
+ _ -> return (Link l d)
+
+pBold = pS "**" (\s -> Bold s)
+pEmph = pS "//" (\s -> Emph s)
+pUnderline = pS "__" (\s -> Underline s)
+pStrike = pS "--" (\s -> Strike s)
+
+pS s f = do
+ string s
+ s <- pStopAt s
+ return (f s)
+
+pStopAt xs = do
+ try (string xs >> return []) <|> (do
+ s <- pMain
+ ss <- pStopAt xs
+ return (s:ss))
+
+pString xs = do
+ try (string xs >> return []) <|> (do
+ s <- anyChar
+ ss <- pString xs
+ return (s:ss))
+
+pHeading = do
+ many1 pEol
+ level <- many1 $ char '='
+ char ' '
+ s <- pStopAt (' ':level)
+ return (Heading (length level) s)
+
+pURL = do
+ proto <- many1 letter
+ string "://"
+ s <- many1 (alphaNum <|> oneOf "?.:&-/")
+ return (Url (proto++"://"++s))
+
+pPre = do
+ string "<pre>"
+ s <- pString "</pre>"
+ return (Pre s)
+
+pMain = try (pHeading)
+ <|> (try (pPara)
+ <|> pSpace
+ <|> try(pPre)
+ <|> try(pBold)
+ <|> try(pEmph)
+ <|> try(pUnderline)
+ <|> try(pStrike)
+ <|> try (pLink)
+ <|> try (pURL)
+ <|> pOtherChar
+ <|> pText)
+
+pOtherChar = do
+ c <- oneOf "*,;.:!?[]()'\"=-%$£<>/\\|"
+ return (Text (c:[]))
+
+pText = do
+ t <- many1 alphaNum--(noneOf ['\n','\r','[',']'])
+ return (Text t)
+
+
newtype PGB = PGB DBService
createPGB :: String -> String -> String -> String -> IO PGB
getList (PGB db) key = do
list <- selectReturnTuples db $ "SELECT id, timestamp, author, comment from fulltexts WHERE keyword = "++tov key
- return $ map (\[id,date,author,comment] -> (id,date,author,comment)) list
-
- get (PGB db) key id = return ""
+ case list of
+ [[]] -> return []
+ _ -> return $ map (\[id,date,author,comment] -> (id,date,author,comment)) list
+
+ get (PGB db) key id = do
+ list <- selectReturnTuples db $ "SELECT fulltext from fulltexts WHERE id = "++tov id
+ case list of
+ [s]:_ -> return (Just s)
+ _ -> return Nothing
setCurrent (PGB db) key id = do
full <- selectReturnTuples db $ "SELECT keyword FROM fulltexts WHERE keyword="++tov key++" AND id='"++id++"'"
- cur <- selectReturnTuples db $ "SELECT keyword FROM curtexts WHERE keyword='"++tov key++"'"
+ cur <- selectReturnTuples db $ "SELECT keyword FROM curtexts WHERE keyword="++tov key
case full of
[[]] -> do
- print "No text found with this id and key"
return False
_ -> do
rows <- case cur of
- [] -> do
- print "No link found in current, inserting"
- execute db $ "INSERT INTO current (keyword, id) VALUES ("++tov id++","++tov key++")"
+ [[]] -> do
+ execute db $ "INSERT INTO current (keyword, id) VALUES ("++tov key++","++tov id++")"
_ -> do
- print "Link found in current, updating"
execute db $ "UPDATE current SET id = "++tov id++" WHERE keyword = "++tov key
- print rows
if rows == 1 then return True
else return False
[[id]] <- selectReturnTuples db $ "SELECT currval('fulltexts_id_seq')"
setCurrent (PGB db) key id
return id
+
+ listKeys (PGB db) = do
+ list <- selectReturnTuples db $ "SELECT keyword FROM fulltexts GROUP BY keyword ORDER BY lower(keyword)"
+ case list of
+ [[]] -> return []
+ _ -> mapM (\[key] -> return key) list
+
tov :: String -> String
tov s = '\'':escapeQuery s++"'"
-
+toHtml :: [Markup] -> String
+toHtml [] = []
+toHtml ((Paragraph):xs) = "<p>\n"++toHtml xs
+toHtml ((Text s):xs) = s++toHtml xs
+toHtml ((Link l d):xs) = "<link: "++l++" desc: "++d++">"++toHtml xs
+toHtml ((Bold d):xs) = "<b>"++toHtml d++"</b>"++toHtml xs
+toHtml ((Emph d):xs) = "<em>"++toHtml d++"</em>"++toHtml xs
+toHtml ((Underline d):xs) = "<u>"++toHtml d++"</u>"++toHtml xs
+toHtml ((Strike d):xs) = "<strike>"++toHtml d++"</strike>"++toHtml xs
+toHtml ((Heading n d):xs) = "\n<h"++show n++">"++toHtml d++"</h"++show n++">\n"++toHtml xs
+toHtml ((Url l):xs) = "<link: "++l++">"++toHtml xs
+toHtml ((Pre s):xs) = "<pre>"++s++"</pre>"++toHtml xs
+
+
+htmlOutput s = case parse wikiParser "" s of
+ Right n -> do
+ putStr (toHtml n)
+ Left e -> do
+ print e
projects / yawbih.git / blobdiff