RosettaCodeData/Task/URL-parser/Haskell/url-parser.hs

76 lines
2.8 KiB
Haskell

module Main (main) where
import Data.Foldable (for_)
import Network.URI
( URI
, URIAuth
, parseURI
, uriAuthority
, uriFragment
, uriPath
, uriPort
, uriQuery
, uriRegName
, uriScheme
, uriUserInfo
)
uriStrings :: [String]
uriStrings =
[ "https://bob:pass@example.com/place"
, "foo://example.com:8042/over/there?name=ferret#nose"
, "urn:example:animal:ferret:nose"
, "jdbc:mysql://test_user:ouupppssss@localhost:3306/sakila?profileSQL=true"
, "ftp://ftp.is.co.za/rfc/rfc1808.txt"
, "http://www.ietf.org/rfc/rfc2396.txt#header1"
, "ldap://[2001:db8::7]/c=GB?objectClass?one"
, "mailto:John.Doe@example.com"
, "news:comp.infosystems.www.servers.unix"
, "tel:+1-816-555-1212"
, "telnet://192.0.2.16:80/"
, "urn:oasis:names:specification:docbook:dtd:xml:4.1.2"
]
trimmedUriScheme :: URI -> String
trimmedUriScheme = init . uriScheme
trimmedUriUserInfo :: URIAuth -> Maybe String
trimmedUriUserInfo uriAuth =
case uriUserInfo uriAuth of
[] -> Nothing
userInfo -> if last userInfo == '@' then Just (init userInfo) else Nothing
trimmedUriPath :: URI -> String
trimmedUriPath uri = case uriPath uri of '/' : t -> t; p -> p
trimmedUriQuery :: URI -> Maybe String
trimmedUriQuery uri = case uriQuery uri of '?' : t -> Just t; _ -> Nothing
trimmedUriFragment :: URI -> Maybe String
trimmedUriFragment uri = case uriFragment uri of '#' : t -> Just t; _ -> Nothing
main :: IO ()
main = do
for_ uriStrings $ \uriString -> do
case parseURI uriString of
Nothing -> putStrLn $ "Could not parse" ++ uriString
Just uri -> do
putStrLn uriString
putStrLn $ " scheme = " ++ trimmedUriScheme uri
case uriAuthority uri of
Nothing -> return ()
Just uriAuth -> do
case trimmedUriUserInfo uriAuth of
Nothing -> return ()
Just userInfo -> putStrLn $ " user-info = " ++ userInfo
putStrLn $ " domain = " ++ uriRegName uriAuth
putStrLn $ " port = " ++ uriPort uriAuth
putStrLn $ " path = " ++ trimmedUriPath uri
case trimmedUriQuery uri of
Nothing -> return ()
Just query -> putStrLn $ " query = " ++ query
case trimmedUriFragment uri of
Nothing -> return ()
Just fragment -> putStrLn $ " fragment = " ++ fragment
putStrLn ""