headings, urls and maybe some more

[yawbih.git] / Wiki.hs

diff --git a/Wiki.hs b/Wiki.hs
index bcfd23694a025b65363372dbb3f4f1ac0fa48978..59e592938df2e7fbb25634bb30b65dd357f05735 100644 (file)
--- a/Wiki.hs
+++ b/Wiki.hs
@@ -1,21 +1,26 @@
 module Wiki (
-       Backend
+       Backend (getCurrent,getList,get,setCurrent,update)
        ,PGB
+       ,createPGB
+       ,Markup (Text, Paragraph, Link, Bold, Emph, Heading, Url)
+       ,Document
+       ,wikiParser
 
 ) where
 
 import Dbconnect
 import Data.Char
+import Text.ParserCombinators.Parsec
 
 class Backend a where
        --Keyword -> (Full text,date)
        getCurrent :: a -> String -> IO (Maybe (String,String))
 
-       --Keyword -> [(id,date)]
+       --Keyword -> [(id,date,author,comment)]
        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
@@ -23,6 +28,99 @@ class Backend a where
        --Keyword -> Full text -> id
        update :: a -> String -> String -> String -> String -> IO String
 
+data Markup = Text String
+       | Paragraph 
+       | Link String String
+       | Bold [Markup]
+       | Emph [Markup]
+       | Heading Int [Markup]
+       | Url 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'
+
+pLinkLong = do
+       string "[["
+       l <- many1 $ noneOf ['|']
+       char '|'
+       d <- many1 $ noneOf "]" 
+       string "]]"
+       return (Link l d)
+
+pLink = do
+       string "[["
+       l <- many1 $ noneOf "]"
+       string "]]"
+       return (Link l l)
+
+pBold = do
+       string "**"
+       s <- pStringParser "**"
+       return (Bold s)
+
+pEmph = do
+       string "//"
+       s <- pStringParser "//"
+       return (Emph s)
+
+pStringParser xs = do 
+       try (string xs >> return []) <|> (do
+               s <- pMain 
+               ss <- pStringParser xs
+               return (s:ss))
+
+pHeading = do
+       many1 pEol
+       level <- many1 $ char '='
+       char ' '
+       s <- pStringParser (' ':level)
+       return (Heading (length level) s)
+
+pURL = do
+       proto <- many1 letter
+       string "://"
+       s <- many1 (alphaNum <|> oneOf "?.:&-/")
+       return (Url (proto++"://"++s))
+       
+pMain = try (pHeading)
+       <|> (try (pPara) 
+       <|> pSpace 
+       <|> try(pBold) 
+       <|> try(pEmph) 
+       <|> try (pLinkLong)
+       <|> 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
@@ -43,24 +141,24 @@ instance Backend PGB where
                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 ""
+       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