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<title>Data/Conduit/Internal/Fusion.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE ExistentialQuantification #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns #-}</span>
<a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE DeriveFunctor #-}</span>
<a name="line-5"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-6"></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'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span>
<a name="line-7"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- ** Types</span>
<a name="line-8"></a> <span class='hs-conid'>Step</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-9"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Stream</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-conid'>ConduitWithStream</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>StreamConduitM</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>StreamConduit</span>
<a name="line-13"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>StreamSource</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>StreamProducer</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>StreamSink</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>StreamConsumer</span>
<a name="line-17"></a> <span class='hs-comment'>-- ** Functions</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>streamConduit</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>streamSource</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>streamSourcePure</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unstream</span>
<a name="line-22"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-23"></a>
<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'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span>
<a name="line-25"></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'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Pipe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pipe</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Functor</span><span class='hs-varop'>.</span><span class='hs-conid'>Identity</span> <span class='hs-layout'>(</span><span class='hs-conid'>Identity</span> <span class='hs-layout'>(</span><span class='hs-varid'>runIdentity</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Void</span> <span class='hs-layout'>(</span><span class='hs-conid'>Void</span><span class='hs-layout'>,</span> <span class='hs-varid'>absurd</span><span class='hs-layout'>)</span>
<a name="line-28"></a>
<a name="line-29"></a><a name="Step"></a><span class='hs-comment'>-- | This is the same as stream fusion\'s Step. Constructors are renamed to</span>
<a name="line-30"></a><a name="Step"></a><span class='hs-comment'>-- avoid confusion with conduit names.</span>
<a name="line-31"></a><a name="Step"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Step</span> <span class='hs-varid'>s</span> <span class='hs-varid'>o</span> <span class='hs-varid'>r</span>
<a name="line-32"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Emit</span> <span class='hs-varid'>s</span> <span class='hs-varid'>o</span>
<a name="line-33"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s</span>
<a name="line-34"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Stop</span> <span class='hs-varid'>r</span>
<a name="line-35"></a> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Functor</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="Stream"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>m</span> <span class='hs-varid'>o</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>s</span><span class='hs-varop'>.</span> <span class='hs-conid'>Stream</span>
<a name="line-38"></a> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Step</span> <span class='hs-varid'>s</span> <span class='hs-varid'>o</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-39"></a> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-40"></a>
<a name="line-41"></a><a name="ConduitWithStream"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConduitWithStream</span>
<a name="line-42"></a> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitM</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-43"></a> <span class='hs-layout'>(</span><span class='hs-conid'>StreamConduitM</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="StreamConduitM"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>StreamConduitM</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>m</span> <span class='hs-varid'>i</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>m</span> <span class='hs-varid'>o</span> <span class='hs-varid'>r</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="StreamConduit"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>StreamConduit</span> <span class='hs-varid'>i</span> <span class='hs-varid'>m</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StreamConduitM</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="StreamSource"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>StreamSource</span> <span class='hs-varid'>m</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StreamConduitM</span> <span class='hs-conid'>()</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="StreamProducer"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>StreamProducer</span> <span class='hs-varid'>m</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>i</span><span class='hs-varop'>.</span> <span class='hs-conid'>StreamConduitM</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-52"></a>
<a name="line-53"></a><a name="StreamSink"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>StreamSink</span> <span class='hs-varid'>i</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StreamConduitM</span> <span class='hs-varid'>i</span> <span class='hs-conid'>Void</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="StreamConsumer"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>StreamConsumer</span> <span class='hs-varid'>i</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>o</span><span class='hs-varop'>.</span> <span class='hs-conid'>StreamConduitM</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-56"></a>
<a name="line-57"></a><a name="unstream"></a><span class='hs-definition'>unstream</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConduitM</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-58"></a><span class='hs-definition'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span>
<a name="line-59"></a><span class='hs-comment'>{-# INLINE [0] unstream #-}</span>
<a name="line-60"></a>
<a name="line-61"></a><a name="fuseStream"></a><span class='hs-definition'>fuseStream</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-62"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-63"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>b</span> <span class='hs-varid'>c</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-64"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>a</span> <span class='hs-varid'>c</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-65"></a><span class='hs-definition'>fuseStream</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>a</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>b</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-varop'>=$=</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span> <span class='hs-varop'>.</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-66"></a><span class='hs-comment'>{-# INLINE fuseStream #-}</span>
<a name="line-67"></a>
<a name="line-68"></a><span class='hs-comment'>{-# RULES "conduit: fuseStream" forall left right.
<a name="line-69"></a> unstream left =$= unstream right = unstream (fuseStream left right)
<a name="line-70"></a> #-}</span>
<a name="line-71"></a>
<a name="line-72"></a><a name="runStream"></a><span class='hs-definition'>runStream</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-73"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-conid'>()</span> <span class='hs-conid'>Void</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-74"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-75"></a><span class='hs-definition'>runStream</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitWithStream</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-76"></a> <span class='hs-varid'>run</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>emptyStep</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-77"></a> <span class='hs-keyword'>where</span>
<a name="line-78"></a> <span class='hs-varid'>emptyStep</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Stop</span> <span class='hs-conid'>()</span>
<a name="line-79"></a> <span class='hs-varid'>run</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>step</span> <span class='hs-varid'>ms0</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-80"></a> <span class='hs-varid'>ms0</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>loop</span>
<a name="line-81"></a> <span class='hs-keyword'>where</span>
<a name="line-82"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-83"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>step</span> <span class='hs-varid'>s</span>
<a name="line-84"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-85"></a> <span class='hs-conid'>Stop</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>r</span>
<a name="line-86"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s'</span>
<a name="line-87"></a> <span class='hs-conid'>Emit</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>absurd</span> <span class='hs-varid'>o</span>
<a name="line-88"></a><span class='hs-comment'>{-# INLINE runStream #-}</span>
<a name="line-89"></a>
<a name="line-90"></a><span class='hs-comment'>{-# RULES "conduit: runStream" forall stream.
<a name="line-91"></a> runConduit (unstream stream) = runStream stream
<a name="line-92"></a> #-}</span>
<a name="line-93"></a>
<a name="line-94"></a><a name="connectStream"></a><span class='hs-definition'>connectStream</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-95"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-conid'>()</span> <span class='hs-varid'>i</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-96"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>i</span> <span class='hs-conid'>Void</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-97"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-98"></a><span class='hs-definition'>connectStream</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitWithStream</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>stream</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitWithStream</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-99"></a> <span class='hs-varid'>run</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span> <span class='hs-varop'>$</span> <span class='hs-varid'>stream</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>emptyStep</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span>
<a name="line-100"></a> <span class='hs-keyword'>where</span>
<a name="line-101"></a> <span class='hs-varid'>emptyStep</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Stop</span> <span class='hs-conid'>()</span>
<a name="line-102"></a> <span class='hs-varid'>run</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>step</span> <span class='hs-varid'>ms0</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-103"></a> <span class='hs-varid'>ms0</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>loop</span>
<a name="line-104"></a> <span class='hs-keyword'>where</span>
<a name="line-105"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-106"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>step</span> <span class='hs-varid'>s</span>
<a name="line-107"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-108"></a> <span class='hs-conid'>Stop</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>r</span>
<a name="line-109"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s'</span>
<a name="line-110"></a> <span class='hs-conid'>Emit</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>absurd</span> <span class='hs-varid'>o</span>
<a name="line-111"></a><span class='hs-comment'>{-# INLINE connectStream #-}</span>
<a name="line-112"></a>
<a name="line-113"></a><span class='hs-comment'>{-# RULES "conduit: connectStream" forall left right.
<a name="line-114"></a> unstream left $$ unstream right = connectStream left right
<a name="line-115"></a> #-}</span>
<a name="line-116"></a>
<a name="line-117"></a><a name="connectStream1"></a><span class='hs-definition'>connectStream1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-118"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-conid'>()</span> <span class='hs-varid'>i</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-119"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConduitM</span> <span class='hs-varid'>i</span> <span class='hs-conid'>Void</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-120"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-121"></a><span class='hs-definition'>connectStream1</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitWithStream</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>fstream</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>ConduitM</span> <span class='hs-varid'>sink0</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-122"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>fstream</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Stream</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varop'>$</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Stop</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</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-keyword'>of</span>
<a name="line-123"></a> <span class='hs-conid'>Stream</span> <span class='hs-varid'>step</span> <span class='hs-varid'>ms0</span> <span class='hs-keyglyph'>-></span>
<a name="line-124"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>loop</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>Done</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varid'>r</span>
<a name="line-125"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>ls</span> <span class='hs-layout'>(</span><span class='hs-conid'>PipeM</span> <span class='hs-varid'>mp</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mp</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>flip</span> <span class='hs-layout'>(</span><span class='hs-varid'>loop</span> <span class='hs-varid'>ls</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-126"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>ls</span> <span class='hs-layout'>(</span><span class='hs-conid'>Leftover</span> <span class='hs-varid'>p</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-conop'>:</span><span class='hs-varid'>ls</span><span class='hs-layout'>)</span> <span class='hs-varid'>p</span> <span class='hs-varid'>s</span>
<a name="line-127"></a> <span class='hs-varid'>loop</span> <span class='hs-keyword'>_</span> <span class='hs-layout'>(</span><span class='hs-conid'>HaveOutput</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>o</span><span class='hs-layout'>)</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>absurd</span> <span class='hs-varid'>o</span>
<a name="line-128"></a> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-conop'>:</span><span class='hs-varid'>ls</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>NeedInput</span> <span class='hs-varid'>p</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>ls</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-129"></a> <span class='hs-varid'>loop</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-conid'>NeedInput</span> <span class='hs-varid'>p</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-130"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>step</span> <span class='hs-varid'>s</span>
<a name="line-131"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-132"></a> <span class='hs-conid'>Stop</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-133"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-conid'>NeedInput</span> <span class='hs-varid'>p</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-134"></a> <span class='hs-conid'>Emit</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-135"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>ms0</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>loop</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-varid'>sink0</span> <span class='hs-conid'>Done</span><span class='hs-layout'>)</span>
<a name="line-136"></a><span class='hs-comment'>{-# INLINE connectStream1 #-}</span>
<a name="line-137"></a>
<a name="line-138"></a><span class='hs-comment'>{-# RULES "conduit: connectStream1" forall left right.
<a name="line-139"></a> unstream left $$ right = connectStream1 left right
<a name="line-140"></a> #-}</span>
<a name="line-141"></a>
<a name="line-142"></a><span class='hs-comment'>{-
<a name="line-143"></a>
<a name="line-144"></a>Not only will this rule not fire reliably, but due to finalizers, it can change
<a name="line-145"></a>behavior unless implemented very carefully. Odds are that the careful
<a name="line-146"></a>implementation won't be any faster, so leaving this commented out for now.
<a name="line-147"></a>
<a name="line-148"></a>connectStream2 :: Monad m
<a name="line-149"></a> => ConduitM () i m ()
<a name="line-150"></a> -> ConduitWithStream i Void m r
<a name="line-151"></a> -> m r
<a name="line-152"></a>connectStream2 (ConduitM src0) (ConduitWithStream _ fstream) =
<a name="line-153"></a> run $ fstream $ Stream step' $ return (return (), src0 Done)
<a name="line-154"></a> where
<a name="line-155"></a> step' (_, Done ()) = return $ Stop ()
<a name="line-156"></a> {-# INLINE step' #-}
<a name="line-157"></a>
<a name="line-158"></a> run (Stream step ms0) =
<a name="line-159"></a> ms0 >>= loop
<a name="line-160"></a> where
<a name="line-161"></a> loop s = do
<a name="line-162"></a> res <- step s
<a name="line-163"></a> case res of
<a name="line-164"></a> Stop r -> return r
<a name="line-165"></a> Emit _ o -> absurd o
<a name="line-166"></a> Skip s' -> loop s'
<a name="line-167"></a>{-# INLINE connectStream2 #-}
<a name="line-168"></a>
<a name="line-169"></a>{-# RULES "conduit: connectStream2" forall left right.
<a name="line-170"></a> left $$ unstream right = connectStream2 left right
<a name="line-171"></a> #-}
<a name="line-172"></a>-}</span>
<a name="line-173"></a>
<a name="line-174"></a><a name="streamConduit"></a><span class='hs-definition'>streamConduit</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ConduitM</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-175"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>m</span> <span class='hs-varid'>i</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>m</span> <span class='hs-varid'>o</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-176"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-177"></a><span class='hs-definition'>streamConduit</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConduitWithStream</span>
<a name="line-178"></a><span class='hs-comment'>{-# INLINE CONLIKE streamConduit #-}</span>
<a name="line-179"></a>
<a name="line-180"></a><a name="streamSource"></a><span class='hs-definition'>streamSource</span>
<a name="line-181"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-182"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>m</span> <span class='hs-varid'>o</span> <span class='hs-conid'>()</span>
<a name="line-183"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-184"></a><span class='hs-definition'>streamSource</span> <span class='hs-varid'>str</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>step</span> <span class='hs-varid'>ms0</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-185"></a> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>con</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varid'>str</span><span class='hs-layout'>)</span>
<a name="line-186"></a> <span class='hs-keyword'>where</span>
<a name="line-187"></a> <span class='hs-varid'>con</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConduitM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>rest</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>PipeM</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-188"></a> <span class='hs-varid'>s0</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>ms0</span>
<a name="line-189"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-190"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>step</span> <span class='hs-varid'>s</span>
<a name="line-191"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-192"></a> <span class='hs-conid'>Stop</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>rest</span> <span class='hs-conid'>()</span>
<a name="line-193"></a> <span class='hs-conid'>Emit</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>HaveOutput</span> <span class='hs-layout'>(</span><span class='hs-conid'>PipeM</span> <span class='hs-varop'>$</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>o</span>
<a name="line-194"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s'</span>
<a name="line-195"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>s0</span>
<a name="line-196"></a><span class='hs-comment'>{-# INLINE streamSource #-}</span>
<a name="line-197"></a>
<a name="line-198"></a><a name="streamSourcePure"></a><span class='hs-definition'>streamSourcePure</span>
<a name="line-199"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-200"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Identity</span> <span class='hs-varid'>o</span> <span class='hs-conid'>()</span>
<a name="line-201"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>i</span> <span class='hs-varid'>o</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-202"></a><span class='hs-definition'>streamSourcePure</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>step</span> <span class='hs-varid'>ms0</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-203"></a> <span class='hs-conid'>ConduitWithStream</span> <span class='hs-varid'>con</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Stream</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-varid'>runIdentity</span> <span class='hs-varop'>.</span> <span class='hs-varid'>step</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>s0</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-204"></a> <span class='hs-keyword'>where</span>
<a name="line-205"></a> <span class='hs-varid'>s0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runIdentity</span> <span class='hs-varid'>ms0</span>
<a name="line-206"></a> <span class='hs-varid'>con</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConduitM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>rest</span> <span class='hs-keyglyph'>-></span>
<a name="line-207"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span>
<a name="line-208"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>runIdentity</span> <span class='hs-varop'>$</span> <span class='hs-varid'>step</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-209"></a> <span class='hs-conid'>Stop</span> <span class='hs-conid'>()</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>rest</span> <span class='hs-conid'>()</span>
<a name="line-210"></a> <span class='hs-conid'>Emit</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>HaveOutput</span> <span class='hs-layout'>(</span><span class='hs-varid'>loop</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</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-varid'>o</span>
<a name="line-211"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s'</span>
<a name="line-212"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s0</span>
<a name="line-213"></a><span class='hs-comment'>{-# INLINE streamSourcePure #-}</span>
</pre></body>
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