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<title>Data/Conduit/Util/Conduit.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE TypeFamilies #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-5"></a><span class='hs-comment'>-- | Utilities for constructing and covnerting conduits. Please see</span>
<a name="line-6"></a><span class='hs-comment'>-- "Data.Conduit.Types.Conduit" for more information on the base types.</span>
<a name="line-7"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span>
<a name="line-8"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>conduitState</span>
<a name="line-9"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>ConduitStateResult</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-10"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>conduitIO</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>ConduitIOResult</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>transConduit</span>
<a name="line-13"></a> <span class='hs-comment'>-- *** Sequencing</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>SequencedSink</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>sequenceSink</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>sequence</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>SequencedSinkResponse</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-18"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-19"></a>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>sequence</span><span class='hs-layout'>)</span>
<a name="line-21"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Resource</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>
<a name="line-23"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span><span class='hs-varop'>.</span><span class='hs-conid'>Sink</span>
<a name="line-25"></a>
<a name="line-26"></a><a name="ConduitStateResult"></a><span class='hs-comment'>-- | A helper type for @conduitState@, indicating the result of being pushed</span>
<a name="line-27"></a><a name="ConduitStateResult"></a><span class='hs-comment'>-- to. It can either indicate that processing is done, or to continue with the</span>
<a name="line-28"></a><a name="ConduitStateResult"></a><span class='hs-comment'>-- updated state.</span>
<a name="line-29"></a><a name="ConduitStateResult"></a><span class='hs-comment'>--</span>
<a name="line-30"></a><a name="ConduitStateResult"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-31"></a><a name="ConduitStateResult"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ConduitStateResult</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>=</span>
<a name="line-32"></a> <span class='hs-conid'>StateFinished</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>input</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span>
<a name="line-33"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>StateProducing</span> <span class='hs-varid'>state</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span>
<a name="line-34"></a>
<a name="line-35"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitStateResult</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-36"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateFinished</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StateFinished</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>f</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-37"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateProducing</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StateProducing</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>f</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="conduitState"></a><span class='hs-comment'>-- | Construct a 'Conduit' with some stateful functions. This function addresses</span>
<a name="line-40"></a><span class='hs-comment'>-- threading the state value for you.</span>
<a name="line-41"></a><span class='hs-comment'>--</span>
<a name="line-42"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-43"></a><span class='hs-definition'>conduitState</span>
<a name="line-44"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Resource</span> <span class='hs-varid'>m</span>
<a name="line-45"></a> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>state</span> <span class='hs-comment'>-- ^ initial state</span>
<a name="line-46"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>state</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>input</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitStateResult</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Push function.</span>
<a name="line-47"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>state</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Close function. The state need not be returned, since it will not be used again.</span>
<a name="line-48"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Conduit</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-49"></a><span class='hs-definition'>conduitState</span> <span class='hs-varid'>state0</span> <span class='hs-varid'>push0</span> <span class='hs-varid'>close0</span> <span class='hs-keyglyph'>=</span>
<a name="line-50"></a> <span class='hs-conid'>Conduit</span> <span class='hs-layout'>(</span><span class='hs-varid'>push</span> <span class='hs-varid'>state0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>close0</span> <span class='hs-varid'>state0</span><span class='hs-layout'>)</span>
<a name="line-51"></a> <span class='hs-keyword'>where</span>
<a name="line-52"></a> <span class='hs-varid'>push</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-53"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>state</span> <span class='hs-varop'>`seq`</span> <span class='hs-varid'>push0</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span>
<a name="line-54"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-55"></a> <span class='hs-conid'>StateFinished</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Finished</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-56"></a> <span class='hs-conid'>StateProducing</span> <span class='hs-varid'>state'</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Producing</span>
<a name="line-57"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Conduit</span> <span class='hs-layout'>(</span><span class='hs-varid'>push</span> <span class='hs-varid'>state'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>close0</span> <span class='hs-varid'>state'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-58"></a> <span class='hs-varid'>output</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="ConduitIOResult"></a><span class='hs-comment'>-- | A helper type for @conduitIO@, indicating the result of being pushed to.</span>
<a name="line-61"></a><a name="ConduitIOResult"></a><span class='hs-comment'>-- It can either indicate that processing is done, or to continue.</span>
<a name="line-62"></a><a name="ConduitIOResult"></a><span class='hs-comment'>--</span>
<a name="line-63"></a><a name="ConduitIOResult"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-64"></a><a name="ConduitIOResult"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ConduitIOResult</span> <span class='hs-varid'>input</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>=</span>
<a name="line-65"></a> <span class='hs-conid'>IOFinished</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>input</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span>
<a name="line-66"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>IOProducing</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span>
<a name="line-67"></a>
<a name="line-68"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitIOResult</span> <span class='hs-varid'>input</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-69"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>IOFinished</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOFinished</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>f</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-70"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>IOProducing</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>IOProducing</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>f</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="conduitIO"></a><span class='hs-comment'>-- | Construct a 'Conduit'.</span>
<a name="line-73"></a><span class='hs-comment'>--</span>
<a name="line-74"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-75"></a><span class='hs-definition'>conduitIO</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ResourceIO</span> <span class='hs-varid'>m</span>
<a name="line-76"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>state</span> <span class='hs-comment'>-- ^ resource and/or state allocation</span>
<a name="line-77"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>state</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ resource and/or state cleanup</span>
<a name="line-78"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>state</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>input</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitIOResult</span> <span class='hs-varid'>input</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Push function. Note that this need not explicitly perform any cleanup.</span>
<a name="line-79"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>state</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Close function. Note that this need not explicitly perform any cleanup.</span>
<a name="line-80"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Conduit</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-81"></a><span class='hs-definition'>conduitIO</span> <span class='hs-varid'>alloc</span> <span class='hs-varid'>cleanup</span> <span class='hs-varid'>push0</span> <span class='hs-varid'>close0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Conduit</span>
<a name="line-82"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>conduitPush</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>input</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-83"></a> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-layout'>,</span> <span class='hs-varid'>state</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>withIO</span> <span class='hs-varid'>alloc</span> <span class='hs-varid'>cleanup</span>
<a name="line-84"></a> <span class='hs-varid'>push</span> <span class='hs-varid'>key</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span>
<a name="line-85"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>conduitClose</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-86"></a> <span class='hs-layout'>(</span><span class='hs-varid'>key</span><span class='hs-layout'>,</span> <span class='hs-varid'>state</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>withIO</span> <span class='hs-varid'>alloc</span> <span class='hs-varid'>cleanup</span>
<a name="line-87"></a> <span class='hs-varid'>close</span> <span class='hs-varid'>key</span> <span class='hs-varid'>state</span>
<a name="line-88"></a> <span class='hs-layout'>}</span>
<a name="line-89"></a> <span class='hs-keyword'>where</span>
<a name="line-90"></a> <span class='hs-varid'>push</span> <span class='hs-varid'>key</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-91"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>push0</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span>
<a name="line-92"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-93"></a> <span class='hs-conid'>IOProducing</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Producing</span>
<a name="line-94"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Conduit</span> <span class='hs-layout'>(</span><span class='hs-varid'>push</span> <span class='hs-varid'>key</span> <span class='hs-varid'>state</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>close</span> <span class='hs-varid'>key</span> <span class='hs-varid'>state</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-95"></a> <span class='hs-varid'>output</span>
<a name="line-96"></a> <span class='hs-conid'>IOFinished</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-97"></a> <span class='hs-varid'>release</span> <span class='hs-varid'>key</span>
<a name="line-98"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Finished</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-99"></a> <span class='hs-varid'>close</span> <span class='hs-varid'>key</span> <span class='hs-varid'>state</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-100"></a> <span class='hs-varid'>output</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>close0</span> <span class='hs-varid'>state</span>
<a name="line-101"></a> <span class='hs-varid'>release</span> <span class='hs-varid'>key</span>
<a name="line-102"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>output</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="transConduit"></a><span class='hs-comment'>-- | Transform the monad a 'Conduit' lives in.</span>
<a name="line-105"></a><span class='hs-comment'>--</span>
<a name="line-106"></a><span class='hs-comment'>-- See @transSource@ for more information.</span>
<a name="line-107"></a><span class='hs-comment'>--</span>
<a name="line-108"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-109"></a><span class='hs-definition'>transConduit</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Base</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>~</span> <span class='hs-conid'>Base</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-110"></a> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-111"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Conduit</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-112"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Conduit</span> <span class='hs-varid'>input</span> <span class='hs-varid'>n</span> <span class='hs-varid'>output</span>
<a name="line-113"></a><span class='hs-definition'>transConduit</span> <span class='hs-varid'>f</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span>
<a name="line-114"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>conduitPush</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>transResourceT</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-varid'>transConduitPush</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>conduitPush</span> <span class='hs-varid'>c</span>
<a name="line-115"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>conduitClose</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>transResourceT</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-varid'>conduitClose</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-116"></a> <span class='hs-layout'>}</span>
<a name="line-117"></a>
<a name="line-118"></a><a name="transConduitPush"></a><span class='hs-definition'>transConduitPush</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Base</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>~</span> <span class='hs-conid'>Base</span> <span class='hs-varid'>n</span><span class='hs-layout'>,</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span>
<a name="line-119"></a> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>a</span><span class='hs-varop'>.</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-120"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConduitResult</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-121"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConduitResult</span> <span class='hs-varid'>input</span> <span class='hs-varid'>n</span> <span class='hs-varid'>output</span>
<a name="line-122"></a><span class='hs-definition'>transConduitPush</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>Finished</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Finished</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span>
<a name="line-123"></a><span class='hs-definition'>transConduitPush</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producing</span> <span class='hs-varid'>conduit</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Producing</span>
<a name="line-124"></a> <span class='hs-layout'>(</span><span class='hs-varid'>transConduit</span> <span class='hs-varid'>f</span> <span class='hs-varid'>conduit</span><span class='hs-layout'>)</span>
<a name="line-125"></a> <span class='hs-varid'>output</span>
<a name="line-126"></a>
<a name="line-127"></a><a name="SequencedSinkResponse"></a><span class='hs-comment'>-- | Return value from a 'SequencedSink'.</span>
<a name="line-128"></a><a name="SequencedSinkResponse"></a><span class='hs-comment'>--</span>
<a name="line-129"></a><a name="SequencedSinkResponse"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-130"></a><a name="SequencedSinkResponse"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>SequencedSinkResponse</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>=</span>
<a name="line-131"></a> <span class='hs-conid'>Emit</span> <span class='hs-varid'>state</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- ^ Set a new state, and emit some new output.</span>
<a name="line-132"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Stop</span> <span class='hs-comment'>-- ^ End the conduit.</span>
<a name="line-133"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>StartConduit</span> <span class='hs-layout'>(</span><span class='hs-conid'>Conduit</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- ^ Pass control to a new conduit.</span>
<a name="line-134"></a>
<a name="line-135"></a><a name="SequencedSink"></a><span class='hs-comment'>-- | Helper type for constructing a @Conduit@ based on @Sink@s. This allows you</span>
<a name="line-136"></a><a name="SequencedSink"></a><span class='hs-comment'>-- to write higher-level code that takes advantage of existing conduits and</span>
<a name="line-137"></a><a name="SequencedSink"></a><span class='hs-comment'>-- sinks, and leverages a sink's monadic interface.</span>
<a name="line-138"></a><a name="SequencedSink"></a><span class='hs-comment'>--</span>
<a name="line-139"></a><a name="SequencedSink"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-140"></a><a name="SequencedSink"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>SequencedSink</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>=</span>
<a name="line-141"></a> <span class='hs-varid'>state</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Sink</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>SequencedSinkResponse</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span>
<a name="line-142"></a>
<a name="line-143"></a><a name="SCState"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>SCState</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>=</span>
<a name="line-144"></a> <span class='hs-conid'>SCNewState</span> <span class='hs-varid'>state</span>
<a name="line-145"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>SCConduit</span> <span class='hs-layout'>(</span><span class='hs-conid'>Conduit</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span>
<a name="line-146"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>SCSink</span> <span class='hs-layout'>(</span><span class='hs-varid'>input</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>SinkResult</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>SequencedSinkResponse</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-147"></a> <span class='hs-layout'>(</span><span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>SequencedSinkResponse</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-148"></a>
<a name="line-149"></a><a name="sequenceSink"></a><span class='hs-comment'>-- | Convert a 'SequencedSink' into a 'Conduit'.</span>
<a name="line-150"></a><span class='hs-comment'>--</span>
<a name="line-151"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-152"></a><span class='hs-definition'>sequenceSink</span>
<a name="line-153"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Resource</span> <span class='hs-varid'>m</span>
<a name="line-154"></a> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>state</span> <span class='hs-comment'>-- ^ initial state</span>
<a name="line-155"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SequencedSink</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-156"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Conduit</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-157"></a><span class='hs-definition'>sequenceSink</span> <span class='hs-varid'>state0</span> <span class='hs-varid'>fsink</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>conduitState</span>
<a name="line-158"></a> <span class='hs-layout'>(</span><span class='hs-conid'>SCNewState</span> <span class='hs-varid'>state0</span><span class='hs-layout'>)</span>
<a name="line-159"></a> <span class='hs-layout'>(</span><span class='hs-varid'>scPush</span> <span class='hs-varid'>id</span> <span class='hs-varid'>fsink</span><span class='hs-layout'>)</span>
<a name="line-160"></a> <span class='hs-varid'>scClose</span>
<a name="line-161"></a>
<a name="line-162"></a><a name="goRes"></a><span class='hs-definition'>goRes</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Resource</span> <span class='hs-varid'>m</span>
<a name="line-163"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SequencedSinkResponse</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-164"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>input</span>
<a name="line-165"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-166"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SequencedSink</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-167"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitStateResult</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCState</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span> <span class='hs-varid'>input</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span>
<a name="line-168"></a><span class='hs-definition'>goRes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Emit</span> <span class='hs-varid'>state</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>input</span><span class='hs-layout'>)</span> <span class='hs-varid'>front</span> <span class='hs-varid'>fsink</span> <span class='hs-keyglyph'>=</span>
<a name="line-169"></a> <span class='hs-varid'>scPush</span> <span class='hs-layout'>(</span><span class='hs-varid'>front</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>output</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>fsink</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCNewState</span> <span class='hs-varid'>state</span><span class='hs-layout'>)</span> <span class='hs-varid'>input</span>
<a name="line-170"></a><span class='hs-definition'>goRes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Emit</span> <span class='hs-varid'>state</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>front</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span>
<a name="line-171"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>StateProducing</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCNewState</span> <span class='hs-varid'>state</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>front</span> <span class='hs-varid'>output</span>
<a name="line-172"></a><span class='hs-definition'>goRes</span> <span class='hs-conid'>Stop</span> <span class='hs-varid'>minput</span> <span class='hs-varid'>front</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span>
<a name="line-173"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>StateFinished</span> <span class='hs-varid'>minput</span> <span class='hs-varop'>$</span> <span class='hs-varid'>front</span> <span class='hs-conid'>[]</span>
<a name="line-174"></a><span class='hs-definition'>goRes</span> <span class='hs-layout'>(</span><span class='hs-conid'>StartConduit</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>front</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span>
<a name="line-175"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>StateProducing</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCConduit</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>front</span> <span class='hs-conid'>[]</span>
<a name="line-176"></a><span class='hs-definition'>goRes</span> <span class='hs-layout'>(</span><span class='hs-conid'>StartConduit</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>input</span><span class='hs-layout'>)</span> <span class='hs-varid'>front</span> <span class='hs-varid'>fsink</span> <span class='hs-keyglyph'>=</span>
<a name="line-177"></a> <span class='hs-varid'>scPush</span> <span class='hs-varid'>front</span> <span class='hs-varid'>fsink</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCConduit</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>input</span>
<a name="line-178"></a>
<a name="line-179"></a><a name="scPush"></a><span class='hs-definition'>scPush</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Resource</span> <span class='hs-varid'>m</span>
<a name="line-180"></a> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-181"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SequencedSink</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-182"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SCState</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-183"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>input</span>
<a name="line-184"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitStateResult</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCState</span> <span class='hs-varid'>state</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span> <span class='hs-varid'>input</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span>
<a name="line-185"></a><span class='hs-definition'>scPush</span> <span class='hs-varid'>front</span> <span class='hs-varid'>fsink</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCNewState</span> <span class='hs-varid'>state</span><span class='hs-layout'>)</span> <span class='hs-varid'>input</span> <span class='hs-keyglyph'>=</span>
<a name="line-186"></a> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>fsink</span> <span class='hs-varid'>state</span><span class='hs-layout'>)</span>
<a name="line-187"></a> <span class='hs-keyword'>where</span>
<a name="line-188"></a> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-conid'>SinkData</span> <span class='hs-varid'>push'</span> <span class='hs-varid'>close'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>scPush</span> <span class='hs-varid'>front</span> <span class='hs-varid'>fsink</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCSink</span> <span class='hs-varid'>push'</span> <span class='hs-varid'>close'</span><span class='hs-layout'>)</span> <span class='hs-varid'>input</span>
<a name="line-189"></a> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-conid'>SinkNoData</span> <span class='hs-varid'>res</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>goRes</span> <span class='hs-varid'>res</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>input</span><span class='hs-layout'>)</span> <span class='hs-varid'>front</span> <span class='hs-varid'>fsink</span>
<a name="line-190"></a> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-conid'>SinkLift</span> <span class='hs-varid'>msink</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>msink</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>go</span>
<a name="line-191"></a><span class='hs-definition'>scPush</span> <span class='hs-varid'>front</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCConduit</span> <span class='hs-varid'>conduit</span><span class='hs-layout'>)</span> <span class='hs-varid'>input</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-192"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>conduitPush</span> <span class='hs-varid'>conduit</span> <span class='hs-varid'>input</span>
<a name="line-193"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-194"></a> <span class='hs-conid'>Producing</span> <span class='hs-varid'>c</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StateProducing</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCConduit</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>front</span> <span class='hs-varid'>x</span>
<a name="line-195"></a> <span class='hs-conid'>Finished</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>StateFinished</span> <span class='hs-varid'>x</span> <span class='hs-varop'>$</span> <span class='hs-varid'>front</span> <span class='hs-varid'>y</span>
<a name="line-196"></a><span class='hs-definition'>scPush</span> <span class='hs-varid'>front</span> <span class='hs-varid'>fsink</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCSink</span> <span class='hs-varid'>push</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>input</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-197"></a> <span class='hs-varid'>mres</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>push</span> <span class='hs-varid'>input</span>
<a name="line-198"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>mres</span> <span class='hs-keyword'>of</span>
<a name="line-199"></a> <span class='hs-conid'>Done</span> <span class='hs-varid'>minput</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>goRes</span> <span class='hs-varid'>res</span> <span class='hs-varid'>minput</span> <span class='hs-varid'>front</span> <span class='hs-varid'>fsink</span>
<a name="line-200"></a> <span class='hs-conid'>Processing</span> <span class='hs-varid'>push'</span> <span class='hs-varid'>close'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>StateProducing</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCSink</span> <span class='hs-varid'>push'</span> <span class='hs-varid'>close'</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>front</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-201"></a>
<a name="line-202"></a><a name="scClose"></a><span class='hs-definition'>scClose</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>SCState</span> <span class='hs-varid'>state</span> <span class='hs-varid'>inptu</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ResourceT</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span>
<a name="line-203"></a><span class='hs-definition'>scClose</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCNewState</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-204"></a><span class='hs-definition'>scClose</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCConduit</span> <span class='hs-varid'>conduit</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>conduitClose</span> <span class='hs-varid'>conduit</span>
<a name="line-205"></a><span class='hs-definition'>scClose</span> <span class='hs-layout'>(</span><span class='hs-conid'>SCSink</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>close</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-206"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>close</span>
<a name="line-207"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-208"></a> <span class='hs-conid'>Emit</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>os</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>os</span>
<a name="line-209"></a> <span class='hs-conid'>Stop</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-210"></a> <span class='hs-conid'>StartConduit</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>conduitClose</span> <span class='hs-varid'>c</span>
<a name="line-211"></a>
<a name="line-212"></a><a name="sequence"></a><span class='hs-comment'>-- | Specialised version of 'sequenceSink'</span>
<a name="line-213"></a><span class='hs-comment'>--</span>
<a name="line-214"></a><span class='hs-comment'>-- Note that this function will return an infinite stream if provided a</span>
<a name="line-215"></a><span class='hs-comment'>-- @SinkNoData@ constructor. In other words, you probably don\'t want to do</span>
<a name="line-216"></a><span class='hs-comment'>-- @sequence . return@.</span>
<a name="line-217"></a><span class='hs-comment'>--</span>
<a name="line-218"></a><span class='hs-comment'>-- Since 0.2.1</span>
<a name="line-219"></a><span class='hs-definition'>sequence</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Resource</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Sink</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Conduit</span> <span class='hs-varid'>input</span> <span class='hs-varid'>m</span> <span class='hs-varid'>output</span>
<a name="line-220"></a><span class='hs-definition'>sequence</span> <span class='hs-layout'>(</span><span class='hs-conid'>SinkData</span> <span class='hs-varid'>spush</span> <span class='hs-varid'>sclose</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Conduit</span> <span class='hs-layout'>(</span><span class='hs-varid'>push</span> <span class='hs-varid'>spush</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>close</span> <span class='hs-varid'>sclose</span><span class='hs-layout'>)</span>
<a name="line-221"></a> <span class='hs-keyword'>where</span>
<a name="line-222"></a> <span class='hs-varid'>push</span> <span class='hs-varid'>spush'</span> <span class='hs-varid'>input</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-223"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>spush'</span> <span class='hs-varid'>input</span>
<a name="line-224"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-225"></a> <span class='hs-conid'>Processing</span> <span class='hs-varid'>spush''</span> <span class='hs-varid'>sclose''</span> <span class='hs-keyglyph'>-></span>
<a name="line-226"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Producing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Conduit</span> <span class='hs-layout'>(</span><span class='hs-varid'>push</span> <span class='hs-varid'>spush''</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>close</span> <span class='hs-varid'>sclose''</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-conid'>[]</span>
<a name="line-227"></a> <span class='hs-conid'>Done</span> <span class='hs-conid'>Nothing</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>-></span>
<a name="line-228"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Producing</span> <span class='hs-layout'>(</span><span class='hs-conid'>Conduit</span> <span class='hs-layout'>(</span><span class='hs-varid'>push</span> <span class='hs-varid'>spush</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>close</span> <span class='hs-varid'>sclose</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>output</span><span class='hs-keyglyph'>]</span>
<a name="line-229"></a> <span class='hs-conid'>Done</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>input'</span><span class='hs-layout'>)</span> <span class='hs-varid'>output</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-230"></a> <span class='hs-varid'>res'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>push</span> <span class='hs-varid'>spush</span> <span class='hs-varid'>input'</span>
<a name="line-231"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>res'</span> <span class='hs-keyword'>of</span>
<a name="line-232"></a> <span class='hs-conid'>Producing</span> <span class='hs-varid'>conduit'</span> <span class='hs-varid'>output'</span> <span class='hs-keyglyph'>-></span>
<a name="line-233"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Producing</span> <span class='hs-varid'>conduit'</span> <span class='hs-layout'>(</span><span class='hs-varid'>output</span><span class='hs-conop'>:</span><span class='hs-varid'>output'</span><span class='hs-layout'>)</span>
<a name="line-234"></a> <span class='hs-conid'>Finished</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-str'>"impossible [sequence]"</span>
<a name="line-235"></a> <span class='hs-varid'>close</span> <span class='hs-varid'>sclose'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-layout'>(</span><span class='hs-conop'>:</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-varid'>sclose'</span>
<a name="line-236"></a>
<a name="line-237"></a><span class='hs-definition'>sequence</span> <span class='hs-layout'>(</span><span class='hs-conid'>SinkNoData</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Conduit</span>
<a name="line-238"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>conduitPush</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>input</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Finished</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>input</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>repeat</span> <span class='hs-varid'>output</span><span class='hs-layout'>)</span>
<a name="line-239"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>conduitClose</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>repeat</span> <span class='hs-varid'>output</span>
<a name="line-240"></a> <span class='hs-layout'>}</span>
<a name="line-241"></a><span class='hs-definition'>sequence</span> <span class='hs-layout'>(</span><span class='hs-conid'>SinkLift</span> <span class='hs-varid'>msink</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Conduit</span>
<a name="line-242"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>conduitPush</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>input</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-243"></a> <span class='hs-varid'>sink</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>msink</span>
<a name="line-244"></a> <span class='hs-varid'>conduitPush</span> <span class='hs-layout'>(</span><span class='hs-varid'>sequence</span> <span class='hs-varid'>sink</span><span class='hs-layout'>)</span> <span class='hs-varid'>input</span>
<a name="line-245"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>conduitClose</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-246"></a> <span class='hs-layout'>}</span>
</pre></body>
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