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<pre><a name="line-1"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Network.HTTP.Utils</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Warrick Gray 2002, Bjorn Bringert 2003-2004, Simon Foster 2004, 2007 Robin Bate Boerop, 2008- Sigbjorn Finne</span>
<a name="line-5"></a><span class='hs-comment'>-- License : BSD</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : Sigbjorn Finne <sigbjorn.finne@gmail.com></span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : non-portable (not tested)</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- Set of utility functions and definitions used by package modules.</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Network</span><span class='hs-varop'>.</span><span class='hs-conid'>HTTP</span><span class='hs-varop'>.</span><span class='hs-conid'>Utils</span>
<a name="line-14"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>trim</span> <span class='hs-comment'>-- :: String -> String</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>trimL</span> <span class='hs-comment'>-- :: String -> String</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>trimR</span> <span class='hs-comment'>-- :: String -> String</span>
<a name="line-17"></a>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>crlf</span> <span class='hs-comment'>-- :: String</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lf</span> <span class='hs-comment'>-- :: String</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>sp</span> <span class='hs-comment'>-- :: String</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>split</span> <span class='hs-comment'>-- :: Eq a => a -> [a] -> Maybe ([a],[a])</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>splitBy</span> <span class='hs-comment'>-- :: Eq a => a -> [a] -> [[a]]</span>
<a name="line-24"></a>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>readsOne</span> <span class='hs-comment'>-- :: Read a => (a -> b) -> b -> String -> b</span>
<a name="line-26"></a>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dropWhileTail</span> <span class='hs-comment'>-- :: (a -> Bool) -> [a] -> [a]</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>chopAtDelim</span> <span class='hs-comment'>-- :: Eq a => a -> [a] -> ([a],[a])</span>
<a name="line-29"></a>
<a name="line-30"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-31"></a>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span> <span class='hs-varid'>elemIndex</span> <span class='hs-layout'>)</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="crlf"></a><span class='hs-comment'>-- | @crlf@ is our beloved two-char line terminator.</span>
<a name="line-37"></a><span class='hs-definition'>crlf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-38"></a><span class='hs-definition'>crlf</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"\r\n"</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="lf"></a><span class='hs-comment'>-- | @lf@ is a tolerated line terminator, per RFC 2616 section 19.3.</span>
<a name="line-41"></a><span class='hs-definition'>lf</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-42"></a><span class='hs-definition'>lf</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"\n"</span>
<a name="line-43"></a>
<a name="line-44"></a><a name="sp"></a><span class='hs-comment'>-- | @sp@ lets you save typing one character.</span>
<a name="line-45"></a><span class='hs-definition'>sp</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span>
<a name="line-46"></a><span class='hs-definition'>sp</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>" "</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="split"></a><span class='hs-comment'>-- | @split delim ls@ splits a list into two parts, the @delim@ occurring</span>
<a name="line-49"></a><span class='hs-comment'>-- at the head of the second list. If @delim@ isn't in @ls@, @Nothing@ is</span>
<a name="line-50"></a><span class='hs-comment'>-- returned.</span>
<a name="line-51"></a><span class='hs-definition'>split</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-52"></a><span class='hs-definition'>split</span> <span class='hs-varid'>delim</span> <span class='hs-varid'>list</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>delim</span> <span class='hs-varop'>`elemIndex`</span> <span class='hs-varid'>list</span> <span class='hs-keyword'>of</span>
<a name="line-53"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-54"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>splitAt</span> <span class='hs-varid'>x</span> <span class='hs-varid'>list</span>
<a name="line-55"></a>
<a name="line-56"></a><a name="trim"></a><span class='hs-comment'>-- | @trim str@ removes leading and trailing whitespace from @str@.</span>
<a name="line-57"></a><span class='hs-definition'>trim</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-58"></a><span class='hs-definition'>trim</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>trimR</span> <span class='hs-layout'>(</span><span class='hs-varid'>trimL</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="trimL"></a><span class='hs-comment'>-- | @trimL str@ removes leading whitespace (as defined by 'Data.Char.isSpace')</span>
<a name="line-61"></a><span class='hs-comment'>-- from @str@.</span>
<a name="line-62"></a><span class='hs-definition'>trimL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-63"></a><span class='hs-definition'>trimL</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>dropWhile</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>xs</span>
<a name="line-64"></a>
<a name="line-65"></a><a name="trimR"></a><span class='hs-comment'>-- | @trimL str@ removes trailing whitespace (as defined by 'Data.Char.isSpace')</span>
<a name="line-66"></a><span class='hs-comment'>-- from @str@.</span>
<a name="line-67"></a><span class='hs-definition'>trimR</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-68"></a><span class='hs-definition'>trimR</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-str'>""</span> <span class='hs-varop'>$</span> <span class='hs-varid'>foldr</span> <span class='hs-varid'>trimIt</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>str</span>
<a name="line-69"></a> <span class='hs-keyword'>where</span>
<a name="line-70"></a> <span class='hs-varid'>trimIt</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-71"></a> <span class='hs-varid'>trimIt</span> <span class='hs-varid'>x</span> <span class='hs-conid'>Nothing</span>
<a name="line-72"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-73"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="splitBy"></a><span class='hs-comment'>-- | @splitMany delim ls@ removes the delimiter @delim@ from @ls@.</span>
<a name="line-76"></a><span class='hs-definition'>splitBy</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span>
<a name="line-77"></a><span class='hs-definition'>splitBy</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-78"></a><span class='hs-definition'>splitBy</span> <span class='hs-varid'>c</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span>
<a name="line-79"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>break</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>of</span>
<a name="line-80"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>xs</span><span class='hs-keyglyph'>]</span>
<a name="line-81"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>as</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>bs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>as</span> <span class='hs-conop'>:</span> <span class='hs-varid'>splitBy</span> <span class='hs-varid'>c</span> <span class='hs-varid'>bs</span>
<a name="line-82"></a>
<a name="line-83"></a><a name="readsOne"></a><span class='hs-comment'>-- | @readsOne f def str@ tries to 'read' @str@, taking</span>
<a name="line-84"></a><span class='hs-comment'>-- the first result and passing it to @f@. If the 'read'</span>
<a name="line-85"></a><span class='hs-comment'>-- doesn't succeed, return @def@.</span>
<a name="line-86"></a><span class='hs-definition'>readsOne</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-87"></a><span class='hs-definition'>readsOne</span> <span class='hs-varid'>f</span> <span class='hs-varid'>n</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span>
<a name="line-88"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>reads</span> <span class='hs-varid'>str</span> <span class='hs-keyword'>of</span>
<a name="line-89"></a> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>v</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>v</span>
<a name="line-90"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span>
<a name="line-91"></a>
<a name="line-92"></a>
<a name="line-93"></a><a name="dropWhileTail"></a><span class='hs-comment'>-- | @dropWhileTail p ls@ chops off trailing elements from @ls@</span>
<a name="line-94"></a><span class='hs-comment'>-- until @p@ returns @False@.</span>
<a name="line-95"></a><span class='hs-definition'>dropWhileTail</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-96"></a><span class='hs-definition'>dropWhileTail</span> <span class='hs-varid'>f</span> <span class='hs-varid'>ls</span> <span class='hs-keyglyph'>=</span>
<a name="line-97"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>foldr</span> <span class='hs-varid'>chop</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>ls</span> <span class='hs-keyword'>of</span> <span class='hs-layout'>{</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>xs</span><span class='hs-layout'>;</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span> <span class='hs-layout'>}</span>
<a name="line-98"></a> <span class='hs-keyword'>where</span>
<a name="line-99"></a> <span class='hs-varid'>chop</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-100"></a> <span class='hs-varid'>chop</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span>
<a name="line-101"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-102"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="chopAtDelim"></a><span class='hs-comment'>-- | @chopAtDelim elt ls@ breaks up @ls@ into two at first occurrence</span>
<a name="line-105"></a><span class='hs-comment'>-- of @elt@; @elt@ is elided too. If @elt@ does not occur, the second</span>
<a name="line-106"></a><span class='hs-comment'>-- list is empty and the first is equal to @ls@.</span>
<a name="line-107"></a><span class='hs-definition'>chopAtDelim</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-108"></a><span class='hs-definition'>chopAtDelim</span> <span class='hs-varid'>elt</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span>
<a name="line-109"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>break</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-varid'>elt</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>of</span>
<a name="line-110"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>xs</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-111"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>as</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>bs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyword'>as</span><span class='hs-layout'>,</span><span class='hs-varid'>bs</span><span class='hs-layout'>)</span>
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