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<title>Text/Regex/TDFA/NewDFA/Uncons.hs</title>
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<pre><a name="line-1"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Regex</span><span class='hs-varop'>.</span><span class='hs-conid'>TDFA</span><span class='hs-varop'>.</span><span class='hs-conid'>NewDFA</span><span class='hs-varop'>.</span><span class='hs-conid'>Uncons</span><span class='hs-layout'>(</span><span class='hs-conid'>Uncons</span><span class='hs-layout'>(</span><span class='hs-varid'>uncons</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Char8</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>SBS</span><span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>,</span><span class='hs-varid'>uncons</span><span class='hs-layout'>)</span>
<a name="line-4"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Char8</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>LBS</span><span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>,</span><span class='hs-varid'>uncons</span><span class='hs-layout'>)</span>
<a name="line-5"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Sequence</span><span class='hs-layout'>(</span><span class='hs-conid'>Seq</span><span class='hs-layout'>,</span><span class='hs-varid'>viewl</span><span class='hs-layout'>,</span><span class='hs-conid'>ViewL</span><span class='hs-layout'>(</span><span class='hs-conid'>EmptyL</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-conop'>:<</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-6"></a>
<a name="line-7"></a><a name="Uncons"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Uncons</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-8"></a> <span class='hs-comment'>{- INLINE uncons #-}</span>
<a name="line-9"></a> <span class='hs-varid'>uncons</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-10"></a>
<a name="line-11"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Uncons</span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-12"></a> <span class='hs-comment'>{- INLINE uncons #-}</span>
<a name="line-13"></a> <span class='hs-varid'>uncons</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-14"></a> <span class='hs-varid'>uncons</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Uncons</span> <span class='hs-layout'>(</span><span class='hs-conid'>Seq</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-17"></a> <span class='hs-comment'>{- INLINE uncons #-}</span>
<a name="line-18"></a> <span class='hs-varid'>uncons</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>viewl</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-19"></a> <span class='hs-conid'>EmptyL</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-20"></a> <span class='hs-varid'>x</span> <span class='hs-conop'>:<</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Uncons</span> <span class='hs-conid'>SBS</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>where</span>
<a name="line-23"></a> <span class='hs-comment'>{- INLINE uncons #-}</span>
<a name="line-24"></a> <span class='hs-varid'>uncons</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SBS</span><span class='hs-varop'>.</span><span class='hs-varid'>uncons</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Uncons</span> <span class='hs-conid'>LBS</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>where</span>
<a name="line-27"></a> <span class='hs-comment'>{- INLINE uncons #-}</span>
<a name="line-28"></a> <span class='hs-varid'>uncons</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>LBS</span><span class='hs-varop'>.</span><span class='hs-varid'>uncons</span>
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