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<title>Data/Conduit/Lazy.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'>-- | Use lazy I\/O for consuming the contents of a source. Warning: All normal</span>
<a name="line-3"></a><span class='hs-comment'>-- warnings of lazy I\/O apply. However, if you consume the content within the</span>
<a name="line-4"></a><span class='hs-comment'>-- ResourceT, you should be safe.</span>
<a name="line-5"></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'>Lazy</span>
<a name="line-6"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>lazyConsume</span>
<a name="line-7"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-8"></a>
<a name="line-9"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span>
<a name="line-10"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>System</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeInterleaveIO</span><span class='hs-layout'>)</span>
<a name="line-11"></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'>Control</span> <span class='hs-layout'>(</span><span class='hs-conid'>MonadBaseControl</span><span class='hs-layout'>,</span> <span class='hs-varid'>liftBaseOp_</span><span class='hs-layout'>)</span>
<a name="line-12"></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> <span class='hs-layout'>(</span><span class='hs-varid'>resourceActive</span><span class='hs-layout'>)</span>
<a name="line-13"></a>
<a name="line-14"></a><a name="lazyConsume"></a><span class='hs-comment'>-- | Use lazy I\/O to consume all elements from a @Source@.</span>
<a name="line-15"></a><span class='hs-comment'>--</span>
<a name="line-16"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-17"></a><span class='hs-definition'>lazyConsume</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Resource</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>MonadBaseControl</span> <span class='hs-conid'>IO</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Source</span> <span class='hs-varid'>m</span> <span class='hs-varid'>a</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'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-18"></a><span class='hs-definition'>lazyConsume</span> <span class='hs-varid'>src0</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-19"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>src0</span>
<a name="line-20"></a> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>src</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftBaseOp_</span> <span class='hs-varid'>unsafeInterleaveIO</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-23"></a> <span class='hs-varid'>ra</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>resourceActive</span>
<a name="line-24"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>ra</span>
<a name="line-25"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span>
<a name="line-26"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>sourcePull</span> <span class='hs-varid'>src</span>
<a name="line-27"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>res</span> <span class='hs-keyword'>of</span>
<a name="line-28"></a> <span class='hs-conid'>Closed</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-29"></a> <span class='hs-conid'>Open</span> <span class='hs-varid'>src'</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-30"></a> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>go</span> <span class='hs-varid'>src'</span>
<a name="line-31"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>y</span>
<a name="line-32"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
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