More cleanup

[yawbih.git] / Wiki.hs

diff --git a/Wiki.hs b/Wiki.hs
index 9db2541a9dcff880b840770e91d9db40a5b2a020..a2d2ff220b019e2b2b02d791da408f1300938a50 100644 (file)
--- a/Wiki.hs
+++ b/Wiki.hs
@@ -1,10 +1,11 @@
 module Wiki (
-       Backend (getCurrent,getList,get,setCurrent,update)
+       Backend (getCurrent,getList,get,setCurrent,update,listKeys)
        ,PGB
        ,createPGB
        ,Markup (Text, Paragraph, Link, Bold, Emph, Heading, Url, Underline, Strike, Pre)
        ,Document
        ,wikiParser
+       ,htmlOutput
 
 ) where
 
@@ -28,6 +29,9 @@ class Backend a where
        --Keyword -> Full text -> id
        update :: a -> String -> String -> String -> String -> IO String
 
+       --[Keyword]
+       listKeys :: a -> IO [String]
+
 data Markup = Text String
        | Paragraph 
        | Link String String
@@ -42,20 +46,16 @@ data Markup = Text String
 type Document = [Markup]
 
 wikiParser :: GenParser Char st Document       
-wikiParser = do 
-       s <- pMain
-       ss <- (wikiParser <|> return [])
-       return (s:ss)
+wikiParser = many1 pMain
 
 pPara = do
        pEol
        pEol
        return (Paragraph)
 
-
 pSpace = do
-       space 
-       return (Text " ")
+       c <- space 
+       return (Text (c:[]))
 
 pEol = char '\n' <|> do
        char '\r'
@@ -88,17 +88,9 @@ pS s f = do
        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))
+pStopAt xs = pUntil pMain xs
+pString xs = pUntil anyChar xs
+pUntil p xs = manyTill p (try $ string xs)
        
 pHeading = do
        many1 pEol
@@ -118,36 +110,34 @@ pPre = do
        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)      
+pMain = choice [
+       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','[',']'])
+       t <- many1 alphaNum
        return (Text t)
 
-
 newtype PGB = PGB DBService
 
 createPGB :: String -> String -> String -> String -> IO PGB
 createPGB host database user password = let db = createDBService host database "" user password Nothing in return (PGB db)
 
-
-testDB = createPGB "wave" "wiki" "wiki" "12wiki34db"
-
 instance Backend PGB where
 
        getCurrent (PGB db) key = do 
@@ -190,9 +180,34 @@ instance Backend PGB where
                                [[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 current 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