url (empty) → 1.0
raw patch · 4 files changed
+246/−0 lines, 4 filesdep +basedep +utf8-stringsetup-changed
Dependencies added: base, utf8-string
Files
- LICENSE +7/−0
- Network/URL.hs +220/−0
- Setup.hs +3/−0
- url.cabal +16/−0
+ LICENSE view
@@ -0,0 +1,7 @@+Copyright (c) 2008 Iavor S. Diatchki++Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:++The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.++THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ Network/URL.hs view
@@ -0,0 +1,220 @@+--------------------------------------------------------------------------------+-- |+-- Module : Network.URL+-- Copyright : (c) Galois, Inc. 2007, 2008+-- License : AllRightsReserved+--+-- Maintainer : Iavor S. Diatchki+-- Stability : Provisional+-- Portability : Portable+--+-- Provides a convinient way for working with HTTP URLs.+-- Based on RFC 1738.++module Network.URL+ ( URL(..), URLType(..), Host(..)+ , exportURL, importURL, exportHost+ , add_param+ , decString, encString+ , ok_host, ok_url, ok_param, ok_path+ ) where++import Data.Word(Word8)+import Data.Char(isAlpha,isAscii,isDigit)+import Data.List(intersperse)+import Numeric(readHex,showHex)+import Control.Monad++import Codec.Binary.UTF8.String as UTF8+++-- | Contains information about the connection to the host.+data Host = Host { secure :: Bool+ , host :: String+ , port :: Maybe Integer+ } deriving (Eq,Ord,Show)++-- | Different types of URL.+data URLType = Absolute Host -- ^ Has a host+ | HostRelative -- ^ Does not have a host+ | PathRelative -- ^ Rleative to another URL+ deriving (Eq, Ord, Show)++-- | A type for working with URL.+-- The parameters are in @application\/x-www-form-urlencoded@ format:+-- <http://www.w3.org/TR/html4/interact/forms.html#h-17.13.4.1>+data URL = URL+ { url_type :: URLType+ , url_path :: String+ , url_params :: [(String,String)]+ } deriving (Eq,Ord,Show)++-- | Add a (key,value) parameter to a URL.+add_param :: URL -> (String,String) -> URL+add_param url x = url { url_params = x : url_params url }+++-- | Convert a list of "bytes" to a URL.+importURL :: String -> Maybe URL+importURL cs1 =+ do (ho,cs5) <- front cs1+ (pa,cs6) <- the_path cs5+ as <- the_args cs6+ return URL { url_type = ho, url_path = pa, url_params = as }++ where+ front ('/':cs) = return (HostRelative,cs)+ front cs =+ case the_prot cs of+ Just (sec,':':'/':'/':cs1) ->+ do let (ho,cs2) = the_host cs1+ (po,cs3) <- the_port cs2+ cs4 <- case cs3 of+ [] -> return []+ '/':cs -> return cs+ _ -> Nothing+ return (Absolute Host { secure = sec, host = ho, port = po }, cs4)+ _ -> return (PathRelative,cs)++ the_prot ('h' : 't' : 't' : 'p' : cs) =+ Just $ case cs of+ 's' : ds -> (True,ds)+ _ -> (False,cs)+ the_prot _ = Nothing -- or perhaps default to http://?++ the_host cs = span ok_host cs++ the_port (':':cs) = case span isDigit cs of+ ([],_) -> Nothing+ (xs,ds) -> Just (Just (read xs),ds)+ the_port cs5 = return (Nothing, cs5)++ the_path cs = do let (as,bs) = break end_path cs+ s <- decString False as+ return (s,bs)+ where end_path c = c == '#' || c == '?'++ the_args ('?' : cs) = parse_params cs+ the_args _ = return []+++parse_params :: String -> Maybe [(String,String)]+parse_params [] = return []+parse_params cs = mapM a_param (breaks ('&'==) cs)+ where+ a_param cs = do let (as,bs) = break ('=' ==) cs+ k <- decString True as+ v <- case bs of+ "" -> return ""+ _:xs -> decString True xs+ return (k,v)+++-- | Convert the host part of a URL to a list of "bytes".+exportHost :: Host -> String+exportHost abs = the_prot ++ "://" ++ host abs ++ the_port+ where the_prot = "http" ++ if secure abs then "s" else ""+ the_port = maybe "" (\x -> ":" ++ show x) (port abs)++++-- | Convert a URL to a list of "bytes".+-- We represent non-ASCII characters using UTF8.+exportURL :: URL -> String+exportURL url = abs ++ the_path ++ the_params+ where+ abs = case url_type url of+ Absolute host -> exportHost host ++ "/"+ HostRelative -> "/"+ PathRelative -> ""++ the_path = encString False ok_path (url_path url)+ the_params = case url_params url of+ [] -> ""+ xs -> "?" ++ concat (intersperse "&" $ map a_param xs)++ a_param (k,mv) = encString True ok_param k +++ case mv of+ "" -> ""+ v -> '=' : encString True ok_param v+++++++-- | Convert a string to bytes by escaping the characetrs that+-- do not satisfy the input predicate. The first argument specifies+-- if we should replace spaces with +.+encString :: Bool -> (Char -> Bool) -> String -> String+encString pl p xs = foldr enc1 [] xs+ where enc1 ' ' xs | pl = '+' : xs+ enc1 x xs = if p x then x : xs else encChar x ++ xs++-- | %-encode a character. Uses UTF8 to represent characters as bytes.+encChar :: Char -> String+encChar c = concatMap encByte (UTF8.encode [c])++-- | %-encode a byte.+encByte :: Word8 -> String+encByte b = '%' : case showHex b "" of+ d@[_] -> '0' : d+ d -> d++-- | Decode a list of "bytes" to a string.+-- Performs % and UTF8 decoding.+decString :: Bool -> String -> Maybe String+decString b xs = fmap UTF8.decode (decStrBytes b xs)++-- Convert a list of "bytes" to actual bytes.+-- Performs %-decoding. The boolean specifies if we should turn pluses into+-- spaces.+decStrBytes :: Bool -> String -> Maybe [Word8]+decStrBytes _ [] = Just []+decStrBytes p ('%' : cs) = do (n,cs1) <- decByte cs+ fmap (n:) (decStrBytes p cs1)+decStrBytes p (c : cs) = let b = if p && c == '+'+ then 32 -- space+ else fromIntegral (fromEnum c)+ in (b :) `fmap` decStrBytes p cs+ -- truncates "large bytes".+++-- | Parse a percent-encoded byte.+decByte :: String -> Maybe (Word8,String)+decByte (x : y : cs) = case readHex [x,y] of+ [(n,"")] -> Just (n,cs)+ _ -> Nothing+decByte _ = Nothing++++-- Classification of characters.+-- Note that these only return True for ASCII characters; this is important.+--------------------------------------------------------------------------------+ok_host :: Char -> Bool+ok_host c = isDigit c || isAlphaASCII c || c == '.' || c == '-'++ok_param :: Char -> Bool+ok_param c = ok_host c || c `elem` "~;:@$_!*'(),"++-- | Characters that can appear non % encoded in the path part of the URL+ok_path :: Char -> Bool+ok_path c = ok_param c || c `elem` "/=&"++-- XXX: others? check RFC+-- | Characters that may appear in the textual representation of a URL+ok_url :: Char -> Bool+ok_url c = isDigit c || isAlphaASCII c || c `elem` ".-;:@$_!*'(),/=&?~%"++-- Misc+--------------------------------------------------------------------------------+isAlphaASCII :: Char -> Bool+isAlphaASCII x = isAscii x && isAlpha x++breaks :: (a -> Bool) -> [a] -> [[a]]+breaks p xs = case break p xs of+ (as,[]) -> [as]+ (as,_:bs) -> as : breaks p bs++
+ Setup.hs view
@@ -0,0 +1,3 @@+import Distribution.Simple++main = defaultMain
+ url.cabal view
@@ -0,0 +1,16 @@+Name: url+Version: 1.0+License: BSD3+License-file: LICENSE+Author: Iavor S. Diatchki+Maintainer: diatchki@galois.com+Homepage: http://www.haskell.org/haskellwiki/Url+Category: Web+Synopsis: A library for working with URLs.+Description: A library for working with URLs.+Build-Depends: base, utf8-string+Build-type: Simple+Extra-source-files: LICENSE+Exposed-modules: Network.URL+GHC-options: -O2 -W+