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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE Rank2Types #-}</span>
<a name="line-4"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Snap</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Routing</span> <span class='hs-keyword'>where</span>
<a name="line-5"></a>
<a name="line-6"></a>
<a name="line-7"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-8"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'><|></span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-layout'>(</span><span class='hs-varid'>c2w</span><span class='hs-layout'>)</span>
<a name="line-11"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>B</span>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-13"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>HashMap</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-layout'>(</span><span class='hs-conid'>HashMap</span><span class='hs-layout'>)</span>
<a name="line-14"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>HashMap</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>H</span>
<a name="line-15"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Map</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Map</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Snap</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Http</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span>
<a name="line-19"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Snap</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Parsing</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Snap</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span>
<a name="line-21"></a>
<a name="line-22"></a>
<a name="line-23"></a><a name="Route"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-24"></a><a name="Route"></a><span class='hs-comment'>{-|
<a name="line-25"></a>
<a name="line-26"></a>The internal data type you use to build a routing tree. Matching is
<a name="line-27"></a>done unambiguously.
<a name="line-28"></a>
<a name="line-29"></a>'Capture' and 'Dir' routes can have a "fallback" route:
<a name="line-30"></a>
<a name="line-31"></a> - For 'Capture', the fallback is routed when there is nothing to capture
<a name="line-32"></a> - For 'Dir', the fallback is routed when we can't find a route in its map
<a name="line-33"></a>
<a name="line-34"></a>Fallback routes are stacked: i.e. for a route like:
<a name="line-35"></a>
<a name="line-36"></a>> Dir [("foo", Capture "bar" (Action bar) NoRoute)] baz
<a name="line-37"></a>
<a name="line-38"></a>visiting the URI foo/ will result in the "bar" capture being empty and
<a name="line-39"></a>triggering its fallback. It's NoRoute, so we go to the nearest parent
<a name="line-40"></a>fallback and try that, which is the baz action.
<a name="line-41"></a>
<a name="line-42"></a>-}</span>
<a name="line-43"></a><a name="Route"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Route</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Action</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-conid'>MonadSnap</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- wraps a 'Snap' action</span>
<a name="line-44"></a> <span class='hs-comment'>-- captures the dir in a param</span>
<a name="line-45"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Capture</span> <span class='hs-conid'>ByteString</span> <span class='hs-layout'>(</span><span class='hs-conid'>Route</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Route</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-46"></a> <span class='hs-comment'>-- match on a dir</span>
<a name="line-47"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Dir</span> <span class='hs-layout'>(</span><span class='hs-conid'>HashMap</span> <span class='hs-conid'>ByteString</span> <span class='hs-layout'>(</span><span class='hs-conid'>Route</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Route</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-48"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>NoRoute</span>
<a name="line-49"></a>
<a name="line-50"></a>
<a name="line-51"></a><a name="instance%20Monoid%20(Route%20a%20m)"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-52"></a><a name="instance%20Monoid%20(Route%20a%20m)"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>Route</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-53"></a> <span class='hs-varid'>mempty</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NoRoute</span>
<a name="line-54"></a>
<a name="line-55"></a> <span class='hs-varid'>mappend</span> <span class='hs-conid'>NoRoute</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>r</span>
<a name="line-56"></a>
<a name="line-57"></a> <span class='hs-varid'>mappend</span> <span class='hs-varid'>l</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Action</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-58"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Action</span> <span class='hs-varid'>a'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Action</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'><|></span> <span class='hs-varid'>a'</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Capture</span> <span class='hs-varid'>p</span> <span class='hs-varid'>r'</span> <span class='hs-varid'>fb</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Capture</span> <span class='hs-varid'>p</span> <span class='hs-varid'>r'</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-60"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Dir</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mappend</span> <span class='hs-layout'>(</span><span class='hs-conid'>Dir</span> <span class='hs-conid'>H</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-61"></a> <span class='hs-conid'>NoRoute</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span>
<a name="line-62"></a>
<a name="line-63"></a> <span class='hs-comment'>-- Whenever we're unioning two Captures and their capture variables</span>
<a name="line-64"></a> <span class='hs-comment'>-- differ, we have an ambiguity. We resolve this in the following order:</span>
<a name="line-65"></a> <span class='hs-comment'>-- 1. Prefer whichever route is longer</span>
<a name="line-66"></a> <span class='hs-comment'>-- 2. Else, prefer whichever has the earliest non-capture</span>
<a name="line-67"></a> <span class='hs-comment'>-- 3. Else, prefer the right-hand side</span>
<a name="line-68"></a> <span class='hs-varid'>mappend</span> <span class='hs-varid'>l</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Capture</span> <span class='hs-varid'>p</span> <span class='hs-varid'>r'</span> <span class='hs-varid'>fb</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-69"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Action</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Capture</span> <span class='hs-varid'>p</span> <span class='hs-varid'>r'</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-70"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Capture</span> <span class='hs-varid'>p'</span> <span class='hs-varid'>r''</span> <span class='hs-varid'>fb'</span><span class='hs-layout'>)</span>
<a name="line-71"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varop'>==</span> <span class='hs-varid'>p'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Capture</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>r'</span> <span class='hs-varid'>r''</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb</span> <span class='hs-varid'>fb'</span><span class='hs-layout'>)</span>
<a name="line-72"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>rh'</span> <span class='hs-varop'>></span> <span class='hs-varid'>rh''</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Capture</span> <span class='hs-varid'>p</span> <span class='hs-varid'>r'</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>rh'</span> <span class='hs-varop'><</span> <span class='hs-varid'>rh''</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Capture</span> <span class='hs-varid'>p'</span> <span class='hs-varid'>r''</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb'</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-74"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>en'</span> <span class='hs-varop'><</span> <span class='hs-varid'>en''</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Capture</span> <span class='hs-varid'>p</span> <span class='hs-varid'>r'</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-75"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Capture</span> <span class='hs-varid'>p'</span> <span class='hs-varid'>r''</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb'</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-76"></a> <span class='hs-keyword'>where</span>
<a name="line-77"></a> <span class='hs-varid'>rh'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>routeHeight</span> <span class='hs-varid'>r'</span>
<a name="line-78"></a> <span class='hs-varid'>rh''</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>routeHeight</span> <span class='hs-varid'>r''</span>
<a name="line-79"></a> <span class='hs-varid'>en'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>routeEarliestNC</span> <span class='hs-varid'>r'</span> <span class='hs-num'>1</span>
<a name="line-80"></a> <span class='hs-varid'>en''</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>routeEarliestNC</span> <span class='hs-varid'>r''</span> <span class='hs-num'>1</span>
<a name="line-81"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Dir</span> <span class='hs-varid'>rm</span> <span class='hs-varid'>fb'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Dir</span> <span class='hs-varid'>rm</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb'</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-82"></a> <span class='hs-conid'>NoRoute</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span>
<a name="line-83"></a>
<a name="line-84"></a> <span class='hs-varid'>mappend</span> <span class='hs-varid'>l</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Dir</span> <span class='hs-varid'>rm</span> <span class='hs-varid'>fb</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-85"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Action</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Dir</span> <span class='hs-varid'>rm</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-86"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Capture</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Dir</span> <span class='hs-varid'>rm</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-87"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Dir</span> <span class='hs-varid'>rm'</span> <span class='hs-varid'>fb'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Dir</span> <span class='hs-layout'>(</span><span class='hs-conid'>H</span><span class='hs-varop'>.</span><span class='hs-varid'>unionWith</span> <span class='hs-varid'>mappend</span> <span class='hs-varid'>rm</span> <span class='hs-varid'>rm'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>mappend</span> <span class='hs-varid'>fb</span> <span class='hs-varid'>fb'</span><span class='hs-layout'>)</span>
<a name="line-88"></a> <span class='hs-conid'>NoRoute</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span>
<a name="line-89"></a>
<a name="line-90"></a>
<a name="line-91"></a><a name="routeHeight"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-92"></a><span class='hs-definition'>routeHeight</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Route</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-93"></a><span class='hs-definition'>routeHeight</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-94"></a> <span class='hs-conid'>NoRoute</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>1</span>
<a name="line-95"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Action</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>1</span>
<a name="line-96"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Capture</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>r'</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>routeHeight</span> <span class='hs-varid'>r'</span>
<a name="line-97"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Dir</span> <span class='hs-varid'>rm</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-num'>1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>foldl</span> <span class='hs-varid'>max</span> <span class='hs-num'>1</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>routeHeight</span> <span class='hs-varop'>$</span> <span class='hs-conid'>H</span><span class='hs-varop'>.</span><span class='hs-varid'>elems</span> <span class='hs-varid'>rm</span><span class='hs-layout'>)</span>
<a name="line-98"></a><span class='hs-comment'>{-# INLINE routeHeight #-}</span>
<a name="line-99"></a>
<a name="line-100"></a>
<a name="line-101"></a><a name="routeEarliestNC"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-102"></a><span class='hs-definition'>routeEarliestNC</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Route</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-103"></a><span class='hs-definition'>routeEarliestNC</span> <span class='hs-varid'>r</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-104"></a> <span class='hs-conid'>NoRoute</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span>
<a name="line-105"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Action</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span>
<a name="line-106"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Capture</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>r'</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>routeEarliestNC</span> <span class='hs-varid'>r'</span> <span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-num'>1</span>
<a name="line-107"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Dir</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span>
<a name="line-108"></a><span class='hs-comment'>{-# INLINE routeEarliestNC #-}</span>
<a name="line-109"></a>
<a name="line-110"></a>
<a name="line-111"></a><a name="route"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-112"></a><span class='hs-comment'>-- | A web handler which, given a mapping from URL entry points to web</span>
<a name="line-113"></a><span class='hs-comment'>-- handlers, efficiently routes requests to the correct handler.</span>
<a name="line-114"></a><span class='hs-comment'>--</span>
<a name="line-115"></a><span class='hs-comment'>-- The URL entry points are given as relative paths, for example:</span>
<a name="line-116"></a><span class='hs-comment'>--</span>
<a name="line-117"></a><span class='hs-comment'>-- > route [ ("foo/bar/quux", fooBarQuux) ]</span>
<a name="line-118"></a><span class='hs-comment'>--</span>
<a name="line-119"></a><span class='hs-comment'>-- If the URI of the incoming request is</span>
<a name="line-120"></a><span class='hs-comment'>--</span>
<a name="line-121"></a><span class='hs-comment'>-- > /foo/bar/quux</span>
<a name="line-122"></a><span class='hs-comment'>--</span>
<a name="line-123"></a><span class='hs-comment'>-- or</span>
<a name="line-124"></a><span class='hs-comment'>--</span>
<a name="line-125"></a><span class='hs-comment'>-- > /foo/bar/quux/...anything...</span>
<a name="line-126"></a><span class='hs-comment'>--</span>
<a name="line-127"></a><span class='hs-comment'>-- then the request will be routed to \"@fooBarQuux@\", with 'rqContextPath'</span>
<a name="line-128"></a><span class='hs-comment'>-- set to \"@\/foo\/bar\/quux\/@\" and 'rqPathInfo' set to</span>
<a name="line-129"></a><span class='hs-comment'>-- \"@...anything...@\".</span>
<a name="line-130"></a><span class='hs-comment'>--</span>
<a name="line-131"></a><span class='hs-comment'>-- A path component within an URL entry point beginning with a colon (\"@:@\")</span>
<a name="line-132"></a><span class='hs-comment'>-- is treated as a /variable capture/; the corresponding path component within</span>
<a name="line-133"></a><span class='hs-comment'>-- the request URI will be entered into the 'rqParams' parameters mapping with</span>
<a name="line-134"></a><span class='hs-comment'>-- the given name. For instance, if the routes were:</span>
<a name="line-135"></a><span class='hs-comment'>--</span>
<a name="line-136"></a><span class='hs-comment'>-- > route [ ("foo/:bar/baz", fooBazHandler) ]</span>
<a name="line-137"></a><span class='hs-comment'>--</span>
<a name="line-138"></a><span class='hs-comment'>-- Then a request for \"@\/foo\/saskatchewan\/baz@\" would be routed to</span>
<a name="line-139"></a><span class='hs-comment'>-- @fooBazHandler@ with a mapping for:</span>
<a name="line-140"></a><span class='hs-comment'>--</span>
<a name="line-141"></a><span class='hs-comment'>-- > "bar" => "saskatchewan"</span>
<a name="line-142"></a><span class='hs-comment'>--</span>
<a name="line-143"></a><span class='hs-comment'>-- in its parameters table.</span>
<a name="line-144"></a><span class='hs-comment'>--</span>
<a name="line-145"></a><span class='hs-comment'>-- Longer paths are matched first, and specific routes are matched before</span>
<a name="line-146"></a><span class='hs-comment'>-- captures. That is, if given routes:</span>
<a name="line-147"></a><span class='hs-comment'>--</span>
<a name="line-148"></a><span class='hs-comment'>-- > [ ("a", h1), ("a/b", h2), ("a/:x", h3) ]</span>
<a name="line-149"></a><span class='hs-comment'>--</span>
<a name="line-150"></a><span class='hs-comment'>-- a request for \"@\/a\/b@\" will go to @h2@, \"@\/a\/s@\" for any /s/ will</span>
<a name="line-151"></a><span class='hs-comment'>-- go to @h3@, and \"@\/a@\" will go to @h1@.</span>
<a name="line-152"></a><span class='hs-comment'>--</span>
<a name="line-153"></a><span class='hs-comment'>-- The following example matches \"@\/article@\" to an article index,</span>
<a name="line-154"></a><span class='hs-comment'>-- \"@\/login@\" to a login, and \"@\/article\/...@\" to an article renderer.</span>
<a name="line-155"></a><span class='hs-comment'>--</span>
<a name="line-156"></a><span class='hs-comment'>-- > route [ ("article", renderIndex)</span>
<a name="line-157"></a><span class='hs-comment'>-- > , ("article/:id", renderArticle)</span>
<a name="line-158"></a><span class='hs-comment'>-- > , ("login", method POST doLogin) ]</span>
<a name="line-159"></a><span class='hs-comment'>--</span>
<a name="line-160"></a><span class='hs-comment'>--</span>
<a name="line-161"></a><span class='hs-comment'>-- /URL decoding/</span>
<a name="line-162"></a><span class='hs-comment'>--</span>
<a name="line-163"></a><span class='hs-comment'>-- A short note about URL decoding: path matching and variable capture are done</span>
<a name="line-164"></a><span class='hs-comment'>-- on /decoded/ URLs, but the contents of 'rqContextPath' and 'rqPathInfo' will</span>
<a name="line-165"></a><span class='hs-comment'>-- contain the original encoded URL, i.e. what the user entered. For example,</span>
<a name="line-166"></a><span class='hs-comment'>-- in the following scenario:</span>
<a name="line-167"></a><span class='hs-comment'>--</span>
<a name="line-168"></a><span class='hs-comment'>-- > route [ ("a b c d/", foo ) ]</span>
<a name="line-169"></a><span class='hs-comment'>--</span>
<a name="line-170"></a><span class='hs-comment'>-- A request for \"@/a+b+c+d@\" will be sent to @foo@ with 'rqContextPath' set</span>
<a name="line-171"></a><span class='hs-comment'>-- to \"/a+b+c+d/\".</span>
<a name="line-172"></a><span class='hs-comment'>--</span>
<a name="line-173"></a><span class='hs-comment'>-- This behaviour changed as of Snap 0.6.1; previous versions had unspecified</span>
<a name="line-174"></a><span class='hs-comment'>-- (and buggy!) semantics here.</span>
<a name="line-175"></a><span class='hs-comment'>--</span>
<a name="line-176"></a><span class='hs-definition'>route</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadSnap</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>,</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-177"></a><span class='hs-definition'>route</span> <span class='hs-varid'>rts</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-178"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getsRequest</span> <span class='hs-varid'>rqPathInfo</span>
<a name="line-179"></a> <span class='hs-varid'>route'</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>splitPath</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-varid'>rts'</span>
<a name="line-180"></a> <span class='hs-keyword'>where</span>
<a name="line-181"></a> <span class='hs-varid'>rts'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mconcat</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>pRoute</span> <span class='hs-varid'>rts</span><span class='hs-layout'>)</span>
<a name="line-182"></a><span class='hs-comment'>{-# INLINE route #-}</span>
<a name="line-183"></a>
<a name="line-184"></a>
<a name="line-185"></a><a name="routeLocal"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-186"></a><span class='hs-comment'>-- | The 'routeLocal' function is the same as 'route'', except it doesn't</span>
<a name="line-187"></a><span class='hs-comment'>-- change the request's context path. This is useful if you want to route to a</span>
<a name="line-188"></a><span class='hs-comment'>-- particular handler but you want that handler to receive the 'rqPathInfo' as</span>
<a name="line-189"></a><span class='hs-comment'>-- it is.</span>
<a name="line-190"></a><span class='hs-definition'>routeLocal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadSnap</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>,</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-191"></a><span class='hs-definition'>routeLocal</span> <span class='hs-varid'>rts</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-192"></a> <span class='hs-varid'>req</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getRequest</span>
<a name="line-193"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ctx</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rqContextPath</span> <span class='hs-varid'>req</span>
<a name="line-194"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rqPathInfo</span> <span class='hs-varid'>req</span>
<a name="line-195"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>md</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>modifyRequest</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>r</span> <span class='hs-layout'>{</span><span class='hs-varid'>rqContextPath</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>ctx</span><span class='hs-layout'>,</span> <span class='hs-varid'>rqPathInfo</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>p</span><span class='hs-layout'>}</span>
<a name="line-196"></a>
<a name="line-197"></a> <span class='hs-layout'>(</span><span class='hs-varid'>route'</span> <span class='hs-varid'>md</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>splitPath</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-varid'>rts'</span><span class='hs-layout'>)</span> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-varid'>md</span> <span class='hs-varop'>>></span> <span class='hs-varid'>pass</span><span class='hs-layout'>)</span>
<a name="line-198"></a>
<a name="line-199"></a> <span class='hs-keyword'>where</span>
<a name="line-200"></a> <span class='hs-varid'>rts'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mconcat</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>pRoute</span> <span class='hs-varid'>rts</span><span class='hs-layout'>)</span>
<a name="line-201"></a><span class='hs-comment'>{-# INLINE routeLocal #-}</span>
<a name="line-202"></a>
<a name="line-203"></a>
<a name="line-204"></a><a name="splitPath"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-205"></a><span class='hs-definition'>splitPath</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ByteString</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span>
<a name="line-206"></a><span class='hs-definition'>splitPath</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>splitWith</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-layout'>(</span><span class='hs-varid'>c2w</span> <span class='hs-chr'>'/'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-207"></a><span class='hs-comment'>{-# INLINE splitPath #-}</span>
<a name="line-208"></a>
<a name="line-209"></a>
<a name="line-210"></a><a name="pRoute"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-211"></a><span class='hs-definition'>pRoute</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadSnap</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>,</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Route</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span>
<a name="line-212"></a><span class='hs-definition'>pRoute</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Action</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>hier</span>
<a name="line-213"></a> <span class='hs-keyword'>where</span>
<a name="line-214"></a> <span class='hs-varid'>hier</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>splitWith</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-layout'>(</span><span class='hs-varid'>c2w</span> <span class='hs-chr'>'/'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-215"></a> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-varid'>rt</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>head</span> <span class='hs-varid'>s</span> <span class='hs-varop'>==</span> <span class='hs-varid'>c2w</span> <span class='hs-chr'>':'</span>
<a name="line-216"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Capture</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>tail</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-varid'>rt</span> <span class='hs-conid'>NoRoute</span>
<a name="line-217"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Dir</span> <span class='hs-layout'>(</span><span class='hs-conid'>H</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>rt</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-conid'>NoRoute</span>
<a name="line-218"></a><span class='hs-comment'>{-# INLINE pRoute #-}</span>
<a name="line-219"></a>
<a name="line-220"></a>
<a name="line-221"></a><a name="route'"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-222"></a><span class='hs-definition'>route'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>MonadSnap</span> <span class='hs-varid'>m</span>
<a name="line-223"></a> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span> <span class='hs-comment'>-- ^ action to run before we call the user handler</span>
<a name="line-224"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ the \"context\"; the list of path segments we've</span>
<a name="line-225"></a> <span class='hs-comment'>-- already successfully matched, in reverse order</span>
<a name="line-226"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ the list of path segments we haven't yet matched</span>
<a name="line-227"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Params</span>
<a name="line-228"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Route</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span>
<a name="line-229"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span>
<a name="line-230"></a><span class='hs-definition'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-varop'>!</span><span class='hs-varid'>ctx</span> <span class='hs-keyword'>_</span> <span class='hs-varop'>!</span><span class='hs-varid'>params</span> <span class='hs-layout'>(</span><span class='hs-conid'>Action</span> <span class='hs-varid'>action</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-231"></a> <span class='hs-varid'>localRequest</span> <span class='hs-layout'>(</span><span class='hs-varid'>updateContextPath</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>ctx'</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>updateParams</span><span class='hs-layout'>)</span>
<a name="line-232"></a> <span class='hs-layout'>(</span><span class='hs-varid'>pre</span> <span class='hs-varop'>>></span> <span class='hs-varid'>action</span><span class='hs-layout'>)</span>
<a name="line-233"></a> <span class='hs-keyword'>where</span>
<a name="line-234"></a> <span class='hs-varid'>ctx'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>intercalate</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c2w</span> <span class='hs-chr'>'/'</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>ctx</span><span class='hs-layout'>)</span>
<a name="line-235"></a> <span class='hs-varid'>updateParams</span> <span class='hs-varid'>req</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>req</span>
<a name="line-236"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>rqParams</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>unionWith</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span> <span class='hs-varid'>params</span> <span class='hs-layout'>(</span><span class='hs-varid'>rqParams</span> <span class='hs-varid'>req</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-237"></a>
<a name="line-238"></a><span class='hs-definition'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-varop'>!</span><span class='hs-varid'>ctx</span> <span class='hs-conid'>[]</span> <span class='hs-varop'>!</span><span class='hs-varid'>params</span> <span class='hs-layout'>(</span><span class='hs-conid'>Capture</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>fb</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-239"></a> <span class='hs-varid'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-varid'>ctx</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>params</span> <span class='hs-varid'>fb</span>
<a name="line-240"></a>
<a name="line-241"></a><span class='hs-definition'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-varop'>!</span><span class='hs-varid'>ctx</span> <span class='hs-varid'>paths</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>cwd</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-varop'>!</span><span class='hs-varid'>params</span> <span class='hs-layout'>(</span><span class='hs-conid'>Capture</span> <span class='hs-varid'>p</span> <span class='hs-varid'>rt</span> <span class='hs-varid'>fb</span><span class='hs-layout'>)</span>
<a name="line-242"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>cwd</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fallback</span>
<a name="line-243"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>m</span> <span class='hs-varop'><|></span> <span class='hs-varid'>fallback</span>
<a name="line-244"></a> <span class='hs-keyword'>where</span>
<a name="line-245"></a> <span class='hs-varid'>fallback</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-varid'>ctx</span> <span class='hs-varid'>paths</span> <span class='hs-varid'>params</span> <span class='hs-varid'>fb</span>
<a name="line-246"></a> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>pass</span>
<a name="line-247"></a> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>cwd'</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>let</span> <span class='hs-varid'>params'</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Map</span><span class='hs-varop'>.</span><span class='hs-varid'>insertWith</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>cwd'</span><span class='hs-keyglyph'>]</span> <span class='hs-varid'>params</span>
<a name="line-248"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-layout'>(</span><span class='hs-varid'>cwd</span><span class='hs-conop'>:</span><span class='hs-varid'>ctx</span><span class='hs-layout'>)</span> <span class='hs-varid'>rest</span> <span class='hs-varid'>params'</span> <span class='hs-varid'>rt</span><span class='hs-layout'>)</span>
<a name="line-249"></a> <span class='hs-layout'>(</span><span class='hs-varid'>urlDecode</span> <span class='hs-varid'>cwd</span><span class='hs-layout'>)</span>
<a name="line-250"></a>
<a name="line-251"></a><span class='hs-definition'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-varop'>!</span><span class='hs-varid'>ctx</span> <span class='hs-conid'>[]</span> <span class='hs-varop'>!</span><span class='hs-varid'>params</span> <span class='hs-layout'>(</span><span class='hs-conid'>Dir</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>fb</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-252"></a> <span class='hs-varid'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-varid'>ctx</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>params</span> <span class='hs-varid'>fb</span>
<a name="line-253"></a><span class='hs-definition'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-varop'>!</span><span class='hs-varid'>ctx</span> <span class='hs-layout'>(</span><span class='hs-varid'>cwd</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-varop'>!</span><span class='hs-varid'>params</span> <span class='hs-layout'>(</span><span class='hs-conid'>Dir</span> <span class='hs-varid'>rtm</span> <span class='hs-varid'>fb</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-254"></a> <span class='hs-varid'>cwd'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>pass</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>urlDecode</span> <span class='hs-varid'>cwd</span>
<a name="line-255"></a> <span class='hs-keyword'>case</span> <span class='hs-conid'>H</span><span class='hs-varop'>.</span><span class='hs-varid'>lookup</span> <span class='hs-varid'>cwd'</span> <span class='hs-varid'>rtm</span> <span class='hs-keyword'>of</span>
<a name="line-256"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>rt</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-layout'>(</span><span class='hs-varid'>cwd</span><span class='hs-conop'>:</span><span class='hs-varid'>ctx</span><span class='hs-layout'>)</span> <span class='hs-varid'>rest</span> <span class='hs-varid'>params</span> <span class='hs-varid'>rt</span><span class='hs-layout'>)</span> <span class='hs-varop'><|></span>
<a name="line-257"></a> <span class='hs-layout'>(</span><span class='hs-varid'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-varid'>ctx</span> <span class='hs-layout'>(</span><span class='hs-varid'>cwd</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-varid'>params</span> <span class='hs-varid'>fb</span><span class='hs-layout'>)</span>
<a name="line-258"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>route'</span> <span class='hs-varid'>pre</span> <span class='hs-varid'>ctx</span> <span class='hs-layout'>(</span><span class='hs-varid'>cwd</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-varid'>params</span> <span class='hs-varid'>fb</span>
<a name="line-259"></a>
<a name="line-260"></a><span class='hs-definition'>route'</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>NoRoute</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>pass</span>
</pre></body>
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