+{-# LANGUAGE TypeSynonymInstances, OverlappingInstances, NoMonomorphismRestriction, ScopedTypeVariables #-}
+
import System.IO (readFile, FilePath(..))
import System.Directory (
getDirectoryContents
import Data.List
import Text.Printf (printf)
import Text.XML.Light
+import qualified Text.XML.Light.Cursor as C
import Control.Monad (foldM)
+import Control.Exception (SomeException(..), handle, bracket)
type Movies = [Movie]
data Movie = Movie {
- movieFiles :: [FilePath]
- , movieId :: Int
+ movieId :: Int
, movieTitle :: String
, movieYear :: Maybe Int
, movieDirectors :: [String]
, moviePressRating :: Maybe Int
, movieGenres :: [String]
, movieSynopsis :: String
- , movieBudget :: Int
+ , movieBudget :: Maybe Int
, movieBudgetUnit :: String
+ , movieFiles :: [FilePath]
, movieUrl :: String
} deriving (Show)
+emptyMovie = Movie 0 "no title" Nothing [] [] []
+ Nothing Nothing Nothing [] "" Nothing "" [] ""
+
data Arg = XML | MovieDir deriving (Show, Eq)
type Args = [(Arg, String)]
paths <- moviePaths dir
movies <- readXMLFile xmlFile
print movies
- print paths
+ --print paths
coversDir = "../img/covers"
movieExtenstions = ["avi", "mkv", "rmvb", "ogm", "divx"]
[]
(contents \\ ["..", "."])
-
readXMLFile :: FilePath -> IO Movies
readXMLFile file = do
content <- readFile file
[]
(elChildren root)
+
+type ParseState = C.Cursor
+newtype Parse alpha = Parse {
+ runParse :: ParseState -> Either String (alpha, ParseState)
+ }
+identity :: alpha -> Parse alpha
+identity a = Parse (\s -> Right (a, s))
+
+parseNextSibilingContent :: Parse String
+parseNextSibilingContent =
+ getState ==> \initState ->
+ case nextSibilingElement initState of
+ Nothing ->
+ bail "no more sibiling slement"
+ Just (elem, cursor) ->
+ putState cursor ==> \_ ->
+ identity (strContent elem)
+
+getState :: Parse ParseState
+getState = Parse (\s -> Right (s, s))
+
+-- Remplace the current state by a new one.
+putState :: ParseState -> Parse ()
+putState s = Parse (\_ -> Right ((), s))
+
+-- Construct a parser which return a string error.
+bail :: String -> Parse alpha
+bail err = Parse $ \s ->
+ Left $
+ err ++ "\nFail at " ++
+ case C.current s of
+ Elem elem -> "element '" ++ qName (elName elem) ++ "'" ++ showLine (elLine elem)
+ Text txt -> "text '" ++ cdData txt ++ "'" ++ showLine (cdLine txt)
+ CRef cref -> "cref '" ++ cref
+ where
+ showLine line =
+ case line of
+ Just l -> " (line " ++ show l ++ ")"
+ Nothing -> ""
+
+(==>) :: Parse alpha -> (alpha -> Parse beta) -> Parse beta
+firstParser ==> secondParser = Parse chainedParser
+ where
+ chainedParser initState =
+ case runParse firstParser initState of
+ Left errMessage ->
+ Left errMessage
+ Right (firstResult, newState) ->
+ runParse (secondParser firstResult) newState
+
elementXMLToMovie :: Element -> Maybe Movie
-elementXMLToMovie elem = undefined
-{-
-findAttr (QName "id" Nothing Nothing) elem of
- Nothing -> acc
- Just id ->
--}
+elementXMLToMovie elem =
+ Just (emptyMovie, C.fromElement elem) >>?
+ (\(m, c) ->
+ case C.current c of
+ Elem elem ->
+ case findAttr (simpleQName "id") elem of
+ Nothing -> Nothing
+ Just id -> Just (m { movieId = read id :: Int }, c)
+ otherwise -> Nothing) >>?
+ (\(m, c) ->
+ case firstChildElement c of
+ Just (elem, c') -> Just (m { movieTitle = strContent elem }, c')
+ otherwise -> Nothing) >>?
+ (\(m, c) ->
+ case nextSibilingElement c of
+ Just (elem, c') -> Just m { movieYear = intElement elem }
+ otherwise -> Nothing)
+
+-- A bit naive
+(>>?) :: Maybe alpha -> (alpha -> Maybe beta) -> Maybe beta
+Nothing >>? _ = Nothing
+Just v >>? f = f v
+
+-- Some XML helper functions
+simpleQName name = QName name Nothing Nothing
+firstChildElement :: C.Cursor -> Maybe (Element, C.Cursor)
+firstChildElement c =
+ case C.firstChild c of
+ Just c' ->
+ case C.current c' of
+ Elem elem -> Just (elem, c')
+ otherwise -> nextSibilingElement c'
+ otherwise -> Nothing
+nextSibilingElement :: C.Cursor -> Maybe (Element, C.Cursor)
+nextSibilingElement c =
+ case C.right c of
+ Just c' ->
+ case C.current c' of
+ Elem elem -> Just (elem, c')
+ otherwise -> nextSibilingElement c'
+ Nothing -> Nothing
+
+-- Try to cast an element content to an Int.
+intElement :: Element -> Maybe Int
+intElement elem =
+ if content == []
+ then Nothing
+ else Just (read content :: Int)
+ where content = strContent elem
writeXMLFile :: Movies -> FilePath -> IO ()
writeXMLFile movies file = undefined