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<pre><a name="line-1"></a><span class='hs-comment'>{-|
<a name="line-2"></a>
<a name="line-3"></a> This module exports the underlying Attoparsec row parser. This is helpful if
<a name="line-4"></a> you want to do some ad-hoc CSV string parsing.
<a name="line-5"></a>
<a name="line-6"></a>-}</span>
<a name="line-7"></a>
<a name="line-8"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>CSV</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
<a name="line-9"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>parseCSV</span>
<a name="line-10"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseRow</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>row</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>csv</span>
<a name="line-13"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-14"></a>
<a name="line-15"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-16"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
<a name="line-17"></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-layout'>(</span><span class='hs-varid'>mzero</span><span class='hs-layout'>)</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Attoparsec</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>P</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>take</span><span class='hs-layout'>)</span>
<a name="line-19"></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'>Attoparsec</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'>C8</span>
<a name="line-20"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-varop'>.</span><span class='hs-conid'>Char8</span> <span class='hs-layout'>(</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-21"></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'>B8</span>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Word</span> <span class='hs-layout'>(</span><span class='hs-conid'>Word8</span><span class='hs-layout'>)</span>
<a name="line-23"></a><span class='hs-comment'>-------------------------------------------------------------------------------</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'>CSV</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span>
<a name="line-25"></a>
<a name="line-26"></a>
<a name="line-27"></a><a name="parseCSV"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-28"></a><span class='hs-comment'>-- | Try to parse given string as CSV</span>
<a name="line-29"></a><span class='hs-definition'>parseCSV</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CSVSettings</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Row</span> <span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span>
<a name="line-30"></a><span class='hs-definition'>parseCSV</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseOnly</span> <span class='hs-varop'>$</span> <span class='hs-varid'>csv</span> <span class='hs-varid'>s</span>
<a name="line-31"></a>
<a name="line-32"></a>
<a name="line-33"></a><a name="parseRow"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-34"></a><span class='hs-comment'>-- | Try to parse given string as 'Row ByteString'</span>
<a name="line-35"></a><span class='hs-definition'>parseRow</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CSVSettings</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ByteString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>String</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Row</span> <span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-36"></a><span class='hs-definition'>parseRow</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseOnly</span> <span class='hs-varop'>$</span> <span class='hs-varid'>row</span> <span class='hs-varid'>s</span>
<a name="line-37"></a>
<a name="line-38"></a>
<a name="line-39"></a><a name="csv"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-40"></a><span class='hs-comment'>-- | Parse CSV</span>
<a name="line-41"></a><span class='hs-definition'>csv</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CSVSettings</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Parser</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Row</span> <span class='hs-conid'>ByteString</span><span class='hs-keyglyph'>]</span>
<a name="line-42"></a><span class='hs-definition'>csv</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-43"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>row</span> <span class='hs-varid'>s</span>
<a name="line-44"></a> <span class='hs-varid'>end</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>atEnd</span>
<a name="line-45"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>end</span>
<a name="line-46"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-47"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-48"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-49"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span>
<a name="line-50"></a> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>csv</span> <span class='hs-varid'>s</span>
<a name="line-51"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-52"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>rest</span>
<a name="line-53"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>rest</span>
<a name="line-54"></a>
<a name="line-55"></a>
<a name="line-56"></a><a name="row"></a><span class='hs-comment'>------------------------------------------------------------------------------</span>
<a name="line-57"></a><span class='hs-comment'>-- | Parse a CSV row</span>
<a name="line-58"></a><span class='hs-definition'>row</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CSVSettings</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Parser</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Row</span> <span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-59"></a><span class='hs-definition'>row</span> <span class='hs-varid'>csvs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>csvrow</span> <span class='hs-varid'>csvs</span> <span class='hs-varop'><|></span> <span class='hs-varid'>badrow</span>
<a name="line-60"></a>
<a name="line-61"></a>
<a name="line-62"></a><a name="badrow"></a><span class='hs-definition'>badrow</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parser</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Row</span> <span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-63"></a><span class='hs-definition'>badrow</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>takeWhile</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-conid'>C8</span><span class='hs-varop'>.</span><span class='hs-varid'>isEndOfLine</span><span class='hs-layout'>)</span> <span class='hs-varop'>*></span>
<a name="line-64"></a> <span class='hs-layout'>(</span><span class='hs-conid'>C8</span><span class='hs-varop'>.</span><span class='hs-varid'>endOfLine</span> <span class='hs-varop'><|></span> <span class='hs-conid'>C8</span><span class='hs-varop'>.</span><span class='hs-varid'>endOfInput</span><span class='hs-layout'>)</span> <span class='hs-varop'>*></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="csvrow"></a><span class='hs-definition'>csvrow</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CSVSettings</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Parser</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Row</span> <span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-67"></a><span class='hs-definition'>csvrow</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span>
<a name="line-68"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>rowbody</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>quotedField'</span> <span class='hs-varop'><|></span> <span class='hs-varid'>field</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varop'>`sepBy`</span> <span class='hs-conid'>C8</span><span class='hs-varop'>.</span><span class='hs-varid'>char</span> <span class='hs-layout'>(</span><span class='hs-varid'>csvSep</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-69"></a> <span class='hs-varid'>properrow</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>rowbody</span> <span class='hs-varop'><*</span> <span class='hs-layout'>(</span><span class='hs-conid'>C8</span><span class='hs-varop'>.</span><span class='hs-varid'>endOfLine</span> <span class='hs-varop'><|></span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>endOfInput</span><span class='hs-layout'>)</span>
<a name="line-70"></a> <span class='hs-varid'>quotedField'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>csvQuoteChar</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>of</span>
<a name="line-71"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>mzero</span>
<a name="line-72"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>q'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-varid'>quotedField</span> <span class='hs-varid'>q'</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>do</span>
<a name="line-74"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>properrow</span>
<a name="line-75"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>res</span>
<a name="line-76"></a>
<a name="line-77"></a><a name="field"></a><span class='hs-definition'>field</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CSVSettings</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Parser</span> <span class='hs-conid'>ByteString</span>
<a name="line-78"></a><span class='hs-definition'>field</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>takeWhile</span> <span class='hs-layout'>(</span><span class='hs-varid'>isFieldChar</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="isFieldChar"></a><span class='hs-definition'>isFieldChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CSVSettings</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-81"></a><span class='hs-definition'>isFieldChar</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>notInClass</span> <span class='hs-varid'>xs'</span>
<a name="line-82"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>csvSep</span> <span class='hs-varid'>s</span> <span class='hs-conop'>:</span> <span class='hs-str'>"\n\r"</span>
<a name="line-83"></a> <span class='hs-varid'>xs'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>csvQuoteChar</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-84"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>xs</span>
<a name="line-85"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>xs</span>
<a name="line-86"></a>
<a name="line-87"></a><a name="quotedField"></a><span class='hs-definition'>quotedField</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Parser</span> <span class='hs-conid'>ByteString</span>
<a name="line-88"></a><span class='hs-definition'>quotedField</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span>
<a name="line-89"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>quoted</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>string</span> <span class='hs-varid'>dbl</span> <span class='hs-varop'>*></span> <span class='hs-varid'>return</span> <span class='hs-varid'>c</span>
<a name="line-90"></a> <span class='hs-varid'>dbl</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B8</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span>
<a name="line-91"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>do</span>
<a name="line-92"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>C8</span><span class='hs-varop'>.</span><span class='hs-varid'>char</span> <span class='hs-varid'>c</span>
<a name="line-93"></a> <span class='hs-varid'>f</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many</span> <span class='hs-layout'>(</span><span class='hs-conid'>C8</span><span class='hs-varop'>.</span><span class='hs-varid'>notChar</span> <span class='hs-varid'>c</span> <span class='hs-varop'><|></span> <span class='hs-varid'>quoted</span><span class='hs-layout'>)</span>
<a name="line-94"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>C8</span><span class='hs-varop'>.</span><span class='hs-varid'>char</span> <span class='hs-varid'>c</span>
<a name="line-95"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>B8</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-varid'>f</span>
<a name="line-96"></a>
<a name="line-97"></a>
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