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<title>Data/Text/IO/Internal.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns, CPP, RecordWildCards #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Data.Text.IO.Internal</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) 2009, 2010 Bryan O'Sullivan,</span>
<a name="line-5"></a><span class='hs-comment'>-- (c) 2009 Simon Marlow</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : bos@serpentine.com</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : GHC</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- Low-level support for text I\/O.</span>
<a name="line-12"></a>
<a name="line-13"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span>
<a name="line-14"></a> <span class='hs-layout'>(</span>
<a name="line-15"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 612</span>
<a name="line-16"></a> <span class='hs-varid'>hGetLineWith</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>readChunk</span>
<a name="line-18"></a><span class='hs-cpp'>#endif</span>
<a name="line-19"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-20"></a>
<a name="line-21"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 612</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'>Exception</span> <span class='hs-layout'>(</span><span class='hs-varid'>catch</span><span class='hs-layout'>)</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'>IORef</span> <span class='hs-layout'>(</span><span class='hs-varid'>readIORef</span><span class='hs-layout'>,</span> <span class='hs-varid'>writeIORef</span><span class='hs-layout'>)</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'>Text</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>)</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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span> <span class='hs-layout'>(</span><span class='hs-varid'>unstream</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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-layout'>(</span><span class='hs-conid'>Step</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><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><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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span><span class='hs-varop'>.</span><span class='hs-conid'>Size</span> <span class='hs-layout'>(</span><span class='hs-varid'>exactSize</span><span class='hs-layout'>,</span> <span class='hs-varid'>maxSize</span><span class='hs-layout'>)</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span> <span class='hs-layout'>(</span><span class='hs-varid'>inlinePerformIO</span><span class='hs-layout'>)</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Foreign</span><span class='hs-varop'>.</span><span class='hs-conid'>Storable</span> <span class='hs-layout'>(</span><span class='hs-varid'>peekElemOff</span><span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Buffer</span> <span class='hs-layout'>(</span><span class='hs-conid'>Buffer</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>CharBuffer</span><span class='hs-layout'>,</span> <span class='hs-conid'>RawCharBuffer</span><span class='hs-layout'>,</span> <span class='hs-varid'>bufferAdjustL</span><span class='hs-layout'>,</span>
<a name="line-31"></a> <span class='hs-varid'>bufferElems</span><span class='hs-layout'>,</span> <span class='hs-varid'>charSize</span><span class='hs-layout'>,</span> <span class='hs-varid'>isEmptyBuffer</span><span class='hs-layout'>,</span> <span class='hs-varid'>readCharBuf</span><span class='hs-layout'>,</span>
<a name="line-32"></a> <span class='hs-varid'>withRawBuffer</span><span class='hs-layout'>,</span> <span class='hs-varid'>writeCharBuf</span><span class='hs-layout'>)</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Handle</span><span class='hs-varop'>.</span><span class='hs-conid'>Internals</span> <span class='hs-layout'>(</span><span class='hs-varid'>ioe_EOF</span><span class='hs-layout'>,</span> <span class='hs-varid'>readTextDevice</span><span class='hs-layout'>,</span> <span class='hs-varid'>wantReadableHandle_</span><span class='hs-layout'>)</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>IO</span><span class='hs-varop'>.</span><span class='hs-conid'>Handle</span><span class='hs-varop'>.</span><span class='hs-conid'>Types</span> <span class='hs-layout'>(</span><span class='hs-conid'>Handle__</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Newline</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-35"></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'>catch</span><span class='hs-layout'>)</span>
<a name="line-36"></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-layout'>(</span><span class='hs-conid'>Handle</span><span class='hs-layout'>)</span>
<a name="line-37"></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'>Error</span> <span class='hs-layout'>(</span><span class='hs-varid'>isEOFError</span><span class='hs-layout'>)</span>
<a name="line-38"></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'>Text</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>T</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="hGetLineWith"></a><span class='hs-comment'>-- | Read a single line of input from a handle, constructing a list of</span>
<a name="line-41"></a><span class='hs-comment'>-- decoded chunks as we go. When we're done, transform them into the</span>
<a name="line-42"></a><span class='hs-comment'>-- destination type.</span>
<a name="line-43"></a><span class='hs-definition'>hGetLineWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Handle</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-varid'>t</span>
<a name="line-44"></a><span class='hs-definition'>hGetLineWith</span> <span class='hs-varid'>f</span> <span class='hs-varid'>h</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>wantReadableHandle_</span> <span class='hs-str'>"hGetLine"</span> <span class='hs-varid'>h</span> <span class='hs-varid'>go</span>
<a name="line-45"></a> <span class='hs-keyword'>where</span>
<a name="line-46"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>hh</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Handle__</span><span class='hs-layout'>{</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>readIORef</span> <span class='hs-varid'>haCharBuffer</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>hGetLineLoop</span> <span class='hs-varid'>hh</span> <span class='hs-conid'>[]</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="hGetLineLoop"></a><span class='hs-definition'>hGetLineLoop</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Handle__</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-49"></a><span class='hs-definition'>hGetLineLoop</span> <span class='hs-varid'>hh</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Handle__</span><span class='hs-layout'>{</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-keyword'>where</span>
<a name="line-50"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>ts</span> <span class='hs-varid'>buf</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Buffer</span><span class='hs-layout'>{</span> <span class='hs-varid'>bufL</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>r0</span><span class='hs-layout'>,</span> <span class='hs-varid'>bufR</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-varid'>bufRaw</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>raw0</span> <span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-51"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>findEOL</span> <span class='hs-varid'>raw</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>r</span> <span class='hs-varop'>==</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-52"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-53"></a> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>r'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readCharBuf</span> <span class='hs-varid'>raw</span> <span class='hs-varid'>r</span>
<a name="line-54"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'\n'</span>
<a name="line-55"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>True</span><span class='hs-layout'>,</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-56"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>findEOL</span> <span class='hs-varid'>raw</span> <span class='hs-varid'>r'</span>
<a name="line-57"></a> <span class='hs-layout'>(</span><span class='hs-varid'>eol</span><span class='hs-layout'>,</span> <span class='hs-varid'>off</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>findEOL</span> <span class='hs-varid'>raw0</span> <span class='hs-varid'>r0</span>
<a name="line-58"></a> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>r'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>haInputNL</span> <span class='hs-varop'>==</span> <span class='hs-conid'>CRLF</span>
<a name="line-59"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>unpack_nl</span> <span class='hs-varid'>raw0</span> <span class='hs-varid'>r0</span> <span class='hs-varid'>off</span>
<a name="line-60"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unpack</span> <span class='hs-varid'>raw0</span> <span class='hs-varid'>r0</span> <span class='hs-varid'>off</span>
<a name="line-61"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>off</span><span class='hs-layout'>)</span>
<a name="line-62"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>eol</span>
<a name="line-63"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>haCharBuffer</span> <span class='hs-layout'>(</span><span class='hs-varid'>bufferAdjustL</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>buf</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>reverse</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-conop'>:</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span>
<a name="line-65"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span>
<a name="line-66"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>buf1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bufferAdjustL</span> <span class='hs-varid'>r'</span> <span class='hs-varid'>buf</span>
<a name="line-67"></a> <span class='hs-varid'>maybe_buf</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>maybeFillReadBuffer</span> <span class='hs-varid'>hh</span> <span class='hs-varid'>buf1</span>
<a name="line-68"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>maybe_buf</span> <span class='hs-keyword'>of</span>
<a name="line-69"></a> <span class='hs-comment'>-- Nothing indicates we caught an EOF, and we may have a</span>
<a name="line-70"></a> <span class='hs-comment'>-- partial line to return.</span>
<a name="line-71"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-72"></a> <span class='hs-comment'>-- we reached EOF. There might be a lone \r left</span>
<a name="line-73"></a> <span class='hs-comment'>-- in the buffer, so check for that and</span>
<a name="line-74"></a> <span class='hs-comment'>-- append it to the line if necessary.</span>
<a name="line-75"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>pre</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isEmptyBuffer</span> <span class='hs-varid'>buf1</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span>
<a name="line-76"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>singleton</span> <span class='hs-chr'>'\r'</span>
<a name="line-77"></a> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>haCharBuffer</span> <span class='hs-varid'>buf1</span><span class='hs-layout'>{</span> <span class='hs-varid'>bufL</span><span class='hs-keyglyph'>=</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>bufR</span><span class='hs-keyglyph'>=</span><span class='hs-num'>0</span> <span class='hs-layout'>}</span>
<a name="line-78"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>.</span> <span class='hs-varid'>filter</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varop'>.</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>pre</span><span class='hs-conop'>:</span><span class='hs-varid'>t</span><span class='hs-conop'>:</span><span class='hs-varid'>ts</span>
<a name="line-79"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>str</span>
<a name="line-80"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>ioe_EOF</span>
<a name="line-81"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-varid'>str</span>
<a name="line-82"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>new_buf</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-conop'>:</span><span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-varid'>new_buf</span>
<a name="line-83"></a>
<a name="line-84"></a><a name="maybeFillReadBuffer"></a><span class='hs-comment'>-- This function is lifted almost verbatim from GHC.IO.Handle.Text.</span>
<a name="line-85"></a><span class='hs-definition'>maybeFillReadBuffer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Handle__</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>CharBuffer</span><span class='hs-layout'>)</span>
<a name="line-86"></a><span class='hs-definition'>maybeFillReadBuffer</span> <span class='hs-varid'>handle_</span> <span class='hs-varid'>buf</span>
<a name="line-87"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>catch</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varop'>`fmap`</span> <span class='hs-varid'>getSomeCharacters</span> <span class='hs-varid'>handle_</span> <span class='hs-varid'>buf</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>e</span> <span class='hs-keyglyph'>-></span>
<a name="line-88"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>isEOFError</span> <span class='hs-varid'>e</span>
<a name="line-89"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-90"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>ioError</span> <span class='hs-varid'>e</span>
<a name="line-91"></a>
<a name="line-92"></a><a name="unpack"></a><span class='hs-definition'>unpack</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RawCharBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Text</span>
<a name="line-93"></a><a name="!"></a><span class='hs-definition'>unpack</span> <span class='hs-varop'>!</span><span class='hs-varid'>buf</span> <span class='hs-varop'>!</span><span class='hs-varid'>r</span> <span class='hs-varop'>!</span><span class='hs-varid'>w</span>
<a name="line-94"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>charSize</span> <span class='hs-varop'>/=</span> <span class='hs-num'>4</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sizeError</span> <span class='hs-str'>"unpack"</span>
<a name="line-95"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>r</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span>
<a name="line-96"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withRawBuffer</span> <span class='hs-varid'>buf</span> <span class='hs-varid'>go</span>
<a name="line-97"></a> <span class='hs-keyword'>where</span>
<a name="line-98"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>pbuf</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-varid'>exactSize</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-comment'>-</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-99"></a> <span class='hs-keyword'>where</span>
<a name="line-100"></a> <span class='hs-varid'>next</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-101"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-layout'>(</span><span class='hs-varid'>ix</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-102"></a> <span class='hs-varid'>ix</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>inlinePerformIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>peekElemOff</span> <span class='hs-varid'>pbuf</span> <span class='hs-varid'>i</span>
<a name="line-103"></a>
<a name="line-104"></a><a name="unpack_nl"></a><span class='hs-definition'>unpack_nl</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>RawCharBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-105"></a><span class='hs-definition'>unpack_nl</span> <span class='hs-varop'>!</span><span class='hs-varid'>buf</span> <span class='hs-varop'>!</span><span class='hs-varid'>r</span> <span class='hs-varop'>!</span><span class='hs-varid'>w</span>
<a name="line-106"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>charSize</span> <span class='hs-varop'>/=</span> <span class='hs-num'>4</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>sizeError</span> <span class='hs-str'>"unpack_nl"</span>
<a name="line-107"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>r</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>,</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-108"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withRawBuffer</span> <span class='hs-varid'>buf</span> <span class='hs-varop'>$</span> <span class='hs-varid'>go</span>
<a name="line-109"></a> <span class='hs-keyword'>where</span>
<a name="line-110"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>pbuf</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-111"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unstream</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-varid'>maxSize</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-comment'>-</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-112"></a> <span class='hs-varid'>w'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>w</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span>
<a name="line-113"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>ix</span> <span class='hs-varid'>w'</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'\r'</span>
<a name="line-114"></a> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>w'</span><span class='hs-layout'>)</span>
<a name="line-115"></a> <span class='hs-keyword'>else</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>w</span><span class='hs-layout'>)</span>
<a name="line-116"></a> <span class='hs-keyword'>where</span>
<a name="line-117"></a> <span class='hs-varid'>next</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-118"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'\r'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>i'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-119"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>i'</span> <span class='hs-varop'><</span> <span class='hs-varid'>w</span>
<a name="line-120"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>ix</span> <span class='hs-varid'>i'</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'\n'</span>
<a name="line-121"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Yield</span> <span class='hs-chr'>'\n'</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-122"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Yield</span> <span class='hs-chr'>'\n'</span> <span class='hs-varid'>i'</span>
<a name="line-123"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Done</span>
<a name="line-124"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-125"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ix</span> <span class='hs-varid'>i</span>
<a name="line-126"></a> <span class='hs-varid'>ix</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>inlinePerformIO</span> <span class='hs-varop'>$</span> <span class='hs-varid'>peekElemOff</span> <span class='hs-varid'>pbuf</span> <span class='hs-varid'>i</span>
<a name="line-127"></a>
<a name="line-128"></a><a name="getSomeCharacters"></a><span class='hs-comment'>-- This function is completely lifted from GHC.IO.Handle.Text.</span>
<a name="line-129"></a><span class='hs-definition'>getSomeCharacters</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Handle__</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>CharBuffer</span>
<a name="line-130"></a><span class='hs-definition'>getSomeCharacters</span> <span class='hs-varid'>handle_</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Handle__</span><span class='hs-layout'>{</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>}</span> <span class='hs-varid'>buf</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Buffer</span><span class='hs-layout'>{</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'>=</span>
<a name="line-131"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>bufferElems</span> <span class='hs-varid'>buf</span> <span class='hs-keyword'>of</span>
<a name="line-132"></a> <span class='hs-comment'>-- buffer empty: read some more</span>
<a name="line-133"></a> <span class='hs-num'>0</span> <span class='hs-keyglyph'>-></span> <span class='hs-comment'>{-# SCC "readTextDevice" #-}</span> <span class='hs-varid'>readTextDevice</span> <span class='hs-varid'>handle_</span> <span class='hs-varid'>buf</span>
<a name="line-134"></a>
<a name="line-135"></a> <span class='hs-comment'>-- if the buffer has a single '\r' in it and we're doing newline</span>
<a name="line-136"></a> <span class='hs-comment'>-- translation: read some more</span>
<a name="line-137"></a> <span class='hs-num'>1</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>haInputNL</span> <span class='hs-varop'>==</span> <span class='hs-conid'>CRLF</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-138"></a> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>readCharBuf</span> <span class='hs-varid'>bufRaw</span> <span class='hs-varid'>bufL</span>
<a name="line-139"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'\r'</span>
<a name="line-140"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span> <span class='hs-comment'>-- shuffle the '\r' to the beginning. This is only safe</span>
<a name="line-141"></a> <span class='hs-comment'>-- if we're about to call readTextDevice, otherwise it</span>
<a name="line-142"></a> <span class='hs-comment'>-- would mess up flushCharBuffer.</span>
<a name="line-143"></a> <span class='hs-comment'>-- See [note Buffer Flushing], GHC.IO.Handle.Types</span>
<a name="line-144"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>writeCharBuf</span> <span class='hs-varid'>bufRaw</span> <span class='hs-num'>0</span> <span class='hs-chr'>'\r'</span>
<a name="line-145"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>buf'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>buf</span><span class='hs-layout'>{</span> <span class='hs-varid'>bufL</span><span class='hs-keyglyph'>=</span><span class='hs-num'>0</span><span class='hs-layout'>,</span> <span class='hs-varid'>bufR</span><span class='hs-keyglyph'>=</span><span class='hs-num'>1</span> <span class='hs-layout'>}</span>
<a name="line-146"></a> <span class='hs-varid'>readTextDevice</span> <span class='hs-varid'>handle_</span> <span class='hs-varid'>buf'</span>
<a name="line-147"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span>
<a name="line-148"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>buf</span>
<a name="line-149"></a>
<a name="line-150"></a> <span class='hs-comment'>-- buffer has some chars in it already: just return it</span>
<a name="line-151"></a> <span class='hs-sel'>_otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-comment'>{-# SCC "otherwise" #-}</span> <span class='hs-varid'>return</span> <span class='hs-varid'>buf</span>
<a name="line-152"></a>
<a name="line-153"></a><a name="readChunk"></a><span class='hs-comment'>-- | Read a single chunk of strict text from a buffer. Used by both</span>
<a name="line-154"></a><span class='hs-comment'>-- the strict and lazy implementations of hGetContents.</span>
<a name="line-155"></a><span class='hs-definition'>readChunk</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Handle__</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>CharBuffer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>IO</span> <span class='hs-conid'>Text</span>
<a name="line-156"></a><span class='hs-definition'>readChunk</span> <span class='hs-varid'>hh</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Handle__</span><span class='hs-layout'>{</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>}</span> <span class='hs-varid'>buf</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-157"></a> <span class='hs-varid'>buf'</span><span class='hs-keyglyph'>@</span><span class='hs-conid'>Buffer</span><span class='hs-layout'>{</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>}</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getSomeCharacters</span> <span class='hs-varid'>hh</span> <span class='hs-varid'>buf</span>
<a name="line-158"></a> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>haInputNL</span> <span class='hs-varop'>==</span> <span class='hs-conid'>CRLF</span>
<a name="line-159"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>unpack_nl</span> <span class='hs-varid'>bufRaw</span> <span class='hs-varid'>bufL</span> <span class='hs-varid'>bufR</span>
<a name="line-160"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unpack</span> <span class='hs-varid'>bufRaw</span> <span class='hs-varid'>bufL</span> <span class='hs-varid'>bufR</span>
<a name="line-161"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span><span class='hs-layout'>,</span><span class='hs-varid'>bufR</span><span class='hs-layout'>)</span>
<a name="line-162"></a> <span class='hs-varid'>writeIORef</span> <span class='hs-varid'>haCharBuffer</span> <span class='hs-layout'>(</span><span class='hs-varid'>bufferAdjustL</span> <span class='hs-varid'>r</span> <span class='hs-varid'>buf'</span><span class='hs-layout'>)</span>
<a name="line-163"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>t</span>
<a name="line-164"></a>
<a name="line-165"></a><a name="sizeError"></a><span class='hs-definition'>sizeError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-166"></a><span class='hs-definition'>sizeError</span> <span class='hs-varid'>loc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Data.Text.IO."</span> <span class='hs-varop'>++</span> <span class='hs-varid'>loc</span> <span class='hs-varop'>++</span> <span class='hs-str'>": bad internal buffer size"</span>
<a name="line-167"></a><span class='hs-cpp'>#endif</span>
</pre></body>
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