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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE DeriveDataTypeable #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE FlexibleContexts #-}</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright: 2011 Michael Snoyman, 2010-2011 John Millikin</span>
<a name="line-5"></a><span class='hs-comment'>-- License: MIT</span>
<a name="line-6"></a><span class='hs-comment'>--</span>
<a name="line-7"></a><span class='hs-comment'>-- Handle streams of text.</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Parts of this code were taken from enumerator and adapted for conduits.</span>
<a name="line-10"></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'>Text</span>
<a name="line-11"></a> <span class='hs-layout'>(</span>
<a name="line-12"></a>
<a name="line-13"></a> <span class='hs-comment'>-- * Text codecs</span>
<a name="line-14"></a> <span class='hs-conid'>Codec</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>encode</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>decode</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>utf8</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>utf16_le</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>utf16_be</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>utf32_le</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>utf32_be</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>ascii</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>iso8859_1</span>
<a name="line-24"></a>
<a name="line-25"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-26"></a>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Prelude</span>
<a name="line-28"></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'>head</span><span class='hs-layout'>,</span> <span class='hs-varid'>drop</span><span class='hs-layout'>,</span> <span class='hs-varid'>takeWhile</span><span class='hs-layout'>,</span> <span class='hs-varid'>lines</span><span class='hs-layout'>,</span> <span class='hs-varid'>zip</span><span class='hs-layout'>,</span> <span class='hs-varid'>zip3</span><span class='hs-layout'>,</span> <span class='hs-varid'>zipWith</span><span class='hs-layout'>,</span> <span class='hs-varid'>zipWith3</span><span class='hs-layout'>)</span>
<a name="line-29"></a>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Arrow</span> <span class='hs-layout'>(</span><span class='hs-varid'>first</span><span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Exc</span>
<a name="line-32"></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'>Class</span> <span class='hs-layout'>(</span><span class='hs-varid'>lift</span><span class='hs-layout'>)</span>
<a name="line-33"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bits</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>.&.</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>.|.</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>shiftL</span><span class='hs-layout'>)</span>
<a name="line-34"></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-keyword'>as</span> <span class='hs-conid'>B</span>
<a name="line-35"></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-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span><span class='hs-varid'>ord</span><span class='hs-layout'>)</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>catMaybes</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><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-varop'>.</span><span class='hs-conid'>Encoding</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>TE</span>
<a name="line-40"></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> <span class='hs-conid'>Word16</span><span class='hs-layout'>)</span>
<a name="line-41"></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'>unsafePerformIO</span><span class='hs-layout'>)</span>
<a name="line-42"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Typeable</span> <span class='hs-layout'>(</span><span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-43"></a>
<a name="line-44"></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'>Conduit</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>C</span>
<a name="line-45"></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'>Conduit</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>CL</span>
<a name="line-46"></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-conid'>ResourceThrow</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="Codec"></a><span class='hs-comment'>-- | A specific character encoding.</span>
<a name="line-49"></a><a name="Codec"></a><span class='hs-comment'>--</span>
<a name="line-50"></a><a name="Codec"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-51"></a><a name="Codec"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Codec</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Codec</span>
<a name="line-52"></a> <span class='hs-layout'>{</span> <span class='hs-varid'>codecName</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span>
<a name="line-53"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>codecEncode</span>
<a name="line-54"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span>
<a name="line-55"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>,</span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>TextException</span><span class='hs-layout'>,</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-56"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>codecDecode</span>
<a name="line-57"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
<a name="line-58"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Either</span>
<a name="line-59"></a> <span class='hs-layout'>(</span><span class='hs-conid'>TextException</span><span class='hs-layout'>,</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-60"></a> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-61"></a> <span class='hs-layout'>}</span>
<a name="line-62"></a>
<a name="line-63"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-conid'>Codec</span> <span class='hs-keyword'>where</span>
<a name="line-64"></a> <span class='hs-varid'>showsPrec</span> <span class='hs-varid'>d</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>showParen</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varop'>></span> <span class='hs-num'>10</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-65"></a> <span class='hs-varid'>showString</span> <span class='hs-str'>"Codec "</span> <span class='hs-varop'>.</span> <span class='hs-varid'>shows</span> <span class='hs-layout'>(</span><span class='hs-varid'>codecName</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-66"></a>
<a name="line-67"></a><a name="encode"></a><span class='hs-comment'>-- | Convert text into bytes, using the provided codec. If the codec is</span>
<a name="line-68"></a><span class='hs-comment'>-- not capable of representing an input character, an exception will be thrown.</span>
<a name="line-69"></a><span class='hs-comment'>--</span>
<a name="line-70"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-71"></a><span class='hs-definition'>encode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ResourceThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Codec</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span> <span class='hs-varid'>m</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
<a name="line-72"></a><span class='hs-definition'>encode</span> <span class='hs-varid'>codec</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CL</span><span class='hs-varop'>.</span><span class='hs-varid'>mapM</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-73"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>bs</span><span class='hs-layout'>,</span> <span class='hs-varid'>mexc</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>codecEncode</span> <span class='hs-varid'>codec</span> <span class='hs-varid'>t</span>
<a name="line-74"></a> <span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>bs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>resourceThrow</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fst</span><span class='hs-layout'>)</span> <span class='hs-varid'>mexc</span>
<a name="line-75"></a>
<a name="line-76"></a>
<a name="line-77"></a><a name="decode"></a><span class='hs-comment'>-- | Convert bytes into text, using the provided codec. If the codec is</span>
<a name="line-78"></a><span class='hs-comment'>-- not capable of decoding an input byte sequence, an exception will be thrown.</span>
<a name="line-79"></a><span class='hs-comment'>--</span>
<a name="line-80"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-81"></a><span class='hs-definition'>decode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ResourceThrow</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Codec</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>Conduit</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-varid'>m</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span>
<a name="line-82"></a><span class='hs-definition'>decode</span> <span class='hs-varid'>codec</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-varid'>conduitState</span>
<a name="line-83"></a> <span class='hs-conid'>Nothing</span>
<a name="line-84"></a> <span class='hs-varid'>push</span>
<a name="line-85"></a> <span class='hs-varid'>close</span>
<a name="line-86"></a> <span class='hs-keyword'>where</span>
<a name="line-87"></a> <span class='hs-varid'>push</span> <span class='hs-varid'>mb</span> <span class='hs-varid'>input</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-88"></a> <span class='hs-layout'>(</span><span class='hs-varid'>mb'</span><span class='hs-layout'>,</span> <span class='hs-varid'>ts</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>go'</span> <span class='hs-varid'>mb</span> <span class='hs-varid'>input</span>
<a name="line-89"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>C</span><span class='hs-varop'>.</span><span class='hs-conid'>StateProducing</span> <span class='hs-varid'>mb'</span> <span class='hs-varid'>ts</span>
<a name="line-90"></a> <span class='hs-varid'>close</span> <span class='hs-varid'>mb</span> <span class='hs-keyglyph'>=</span>
<a name="line-91"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>mb</span> <span class='hs-keyword'>of</span>
<a name="line-92"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span>
<a name="line-93"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>b</span>
<a name="line-94"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-str'>"Data.Conduit.Text.decode: Received a null chunk"</span>
<a name="line-95"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lift</span> <span class='hs-varop'>$</span> <span class='hs-varid'>resourceThrow</span> <span class='hs-varop'>$</span> <span class='hs-conid'>DecodeException</span> <span class='hs-varid'>codec</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>head</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-96"></a>
<a name="line-97"></a> <span class='hs-varid'>go'</span> <span class='hs-varid'>mb</span> <span class='hs-varid'>input</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-comment'>-- FIXME This can be simplified significantly since input is now only a single BS</span>
<a name="line-98"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>bss</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe</span> <span class='hs-varid'>id</span> <span class='hs-layout'>(</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span> <span class='hs-varid'>mb</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>input</span><span class='hs-keyglyph'>]</span>
<a name="line-99"></a> <span class='hs-varid'>either</span> <span class='hs-layout'>(</span><span class='hs-varid'>lift</span> <span class='hs-varop'>.</span> <span class='hs-varid'>resourceThrow</span><span class='hs-layout'>)</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>go</span> <span class='hs-varid'>bss</span> <span class='hs-varid'>id</span>
<a name="line-100"></a>
<a name="line-101"></a> <span class='hs-varid'>go</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>front</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-conid'>Nothing</span><span class='hs-layout'>,</span> <span class='hs-varid'>front</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-102"></a> <span class='hs-varid'>go</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-varid'>front</span>
<a name="line-103"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>front</span>
<a name="line-104"></a> <span class='hs-varid'>go</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-varid'>front</span> <span class='hs-keyglyph'>=</span>
<a name="line-105"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>extra</span> <span class='hs-keyword'>of</span>
<a name="line-106"></a> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-varid'>exc</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-varid'>exc</span>
<a name="line-107"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>bs</span>
<a name="line-108"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>go</span> <span class='hs-varid'>xs</span> <span class='hs-varid'>front'</span>
<a name="line-109"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span>
<a name="line-110"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>of</span>
<a name="line-111"></a> <span class='hs-varid'>y</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>append</span> <span class='hs-varid'>bs</span> <span class='hs-varid'>y</span><span class='hs-conop'>:</span><span class='hs-varid'>ys</span><span class='hs-layout'>)</span> <span class='hs-varid'>front'</span>
<a name="line-112"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>bs</span><span class='hs-layout'>,</span> <span class='hs-varid'>front'</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-113"></a> <span class='hs-keyword'>where</span>
<a name="line-114"></a> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>codecDecode</span> <span class='hs-varid'>codec</span> <span class='hs-varid'>x</span>
<a name="line-115"></a> <span class='hs-varid'>front'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>front</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span>
<a name="line-116"></a>
<a name="line-117"></a><a name="TextException"></a><span class='hs-comment'>-- |</span>
<a name="line-118"></a><a name="TextException"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-119"></a><a name="TextException"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>TextException</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>DecodeException</span> <span class='hs-conid'>Codec</span> <span class='hs-conid'>Word8</span>
<a name="line-120"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>EncodeException</span> <span class='hs-conid'>Codec</span> <span class='hs-conid'>Char</span>
<a name="line-121"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span><span class='hs-layout'>,</span> <span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-122"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Exc</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-conid'>TextException</span>
<a name="line-123"></a>
<a name="line-124"></a><a name="byteSplits"></a><span class='hs-definition'>byteSplits</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
<a name="line-125"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>,</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-126"></a><span class='hs-definition'>byteSplits</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bytes</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-127"></a> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>,</span> <span class='hs-varid'>bytes</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-128"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>n</span> <span class='hs-varid'>bytes</span> <span class='hs-conop'>:</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-129"></a>
<a name="line-130"></a><a name="splitSlowly"></a><span class='hs-definition'>splitSlowly</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-131"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
<a name="line-132"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Either</span>
<a name="line-133"></a> <span class='hs-layout'>(</span><span class='hs-conid'>TextException</span><span class='hs-layout'>,</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-134"></a> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-135"></a><span class='hs-definition'>splitSlowly</span> <span class='hs-varid'>dec</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>valid</span> <span class='hs-keyword'>where</span>
<a name="line-136"></a> <span class='hs-varid'>valid</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>firstValid</span> <span class='hs-layout'>(</span><span class='hs-conid'>Prelude</span><span class='hs-varop'>.</span><span class='hs-varid'>map</span> <span class='hs-varid'>decFirst</span> <span class='hs-varid'>splits</span><span class='hs-layout'>)</span>
<a name="line-137"></a> <span class='hs-varid'>splits</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>byteSplits</span> <span class='hs-varid'>bytes</span>
<a name="line-138"></a> <span class='hs-varid'>firstValid</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Prelude</span><span class='hs-varop'>.</span><span class='hs-varid'>head</span> <span class='hs-varop'>.</span> <span class='hs-varid'>catMaybes</span>
<a name="line-139"></a> <span class='hs-varid'>tryDec</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>tryEvaluate</span> <span class='hs-varop'>.</span> <span class='hs-varid'>dec</span>
<a name="line-140"></a>
<a name="line-141"></a> <span class='hs-varid'>decFirst</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tryDec</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>of</span>
<a name="line-142"></a> <span class='hs-conid'>Left</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-143"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tryDec</span> <span class='hs-varid'>b</span> <span class='hs-keyword'>of</span>
<a name="line-144"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>exc</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-varid'>exc</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-145"></a>
<a name="line-146"></a> <span class='hs-comment'>-- this case shouldn't occur, since splitSlowly</span>
<a name="line-147"></a> <span class='hs-comment'>-- is only called when parsing failed somewhere</span>
<a name="line-148"></a> <span class='hs-conid'>Right</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>)</span>
<a name="line-149"></a>
<a name="line-150"></a><a name="utf8"></a><span class='hs-comment'>-- |</span>
<a name="line-151"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-152"></a><span class='hs-definition'>utf8</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Codec</span>
<a name="line-153"></a><span class='hs-definition'>utf8</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Codec</span> <span class='hs-varid'>name</span> <span class='hs-varid'>enc</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>where</span>
<a name="line-154"></a> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-str'>"UTF-8"</span>
<a name="line-155"></a> <span class='hs-varid'>enc</span> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>encodeUtf8</span> <span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-156"></a> <span class='hs-varid'>dec</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>splitQuickly</span> <span class='hs-varid'>bytes</span> <span class='hs-keyword'>of</span>
<a name="line-157"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span>
<a name="line-158"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>splitSlowly</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf8</span> <span class='hs-varid'>bytes</span>
<a name="line-159"></a>
<a name="line-160"></a> <span class='hs-varid'>splitQuickly</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>maybeDecode</span> <span class='hs-keyword'>where</span>
<a name="line-161"></a> <span class='hs-varid'>required</span> <span class='hs-varid'>x0</span>
<a name="line-162"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x0</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x80</span> <span class='hs-varop'>==</span> <span class='hs-num'>0x00</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>1</span>
<a name="line-163"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x0</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0xE0</span> <span class='hs-varop'>==</span> <span class='hs-num'>0xC0</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>2</span>
<a name="line-164"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x0</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0xF0</span> <span class='hs-varop'>==</span> <span class='hs-num'>0xE0</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>3</span>
<a name="line-165"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x0</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0xF8</span> <span class='hs-varop'>==</span> <span class='hs-num'>0xF0</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>4</span>
<a name="line-166"></a>
<a name="line-167"></a> <span class='hs-comment'>-- Invalid input; let Text figure it out</span>
<a name="line-168"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span>
<a name="line-169"></a>
<a name="line-170"></a> <span class='hs-varid'>maxN</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bytes</span>
<a name="line-171"></a>
<a name="line-172"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-varid'>maxN</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf8</span> <span class='hs-varid'>bytes</span><span class='hs-layout'>,</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>)</span>
<a name="line-173"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span>
<a name="line-174"></a> <span class='hs-varid'>req</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>required</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varid'>bytes</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-175"></a> <span class='hs-varid'>tooLong</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>first</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf8</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>n</span> <span class='hs-varid'>bytes</span><span class='hs-layout'>)</span>
<a name="line-176"></a> <span class='hs-varid'>decodeMore</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-varid'>req</span>
<a name="line-177"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>req</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-178"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Nothing</span>
<a name="line-179"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-varid'>req</span> <span class='hs-varop'>></span> <span class='hs-varid'>maxN</span>
<a name="line-180"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>tooLong</span>
<a name="line-181"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>decodeMore</span>
<a name="line-182"></a>
<a name="line-183"></a><a name="utf16_le"></a><span class='hs-comment'>-- |</span>
<a name="line-184"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-185"></a><span class='hs-definition'>utf16_le</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Codec</span>
<a name="line-186"></a><span class='hs-definition'>utf16_le</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Codec</span> <span class='hs-varid'>name</span> <span class='hs-varid'>enc</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>where</span>
<a name="line-187"></a> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-str'>"UTF-16-LE"</span>
<a name="line-188"></a> <span class='hs-varid'>enc</span> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>encodeUtf16LE</span> <span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-189"></a> <span class='hs-varid'>dec</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>splitQuickly</span> <span class='hs-varid'>bytes</span> <span class='hs-keyword'>of</span>
<a name="line-190"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span>
<a name="line-191"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>splitSlowly</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf16LE</span> <span class='hs-varid'>bytes</span>
<a name="line-192"></a>
<a name="line-193"></a> <span class='hs-varid'>splitQuickly</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybeDecode</span> <span class='hs-layout'>(</span><span class='hs-varid'>loop</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-194"></a> <span class='hs-varid'>maxN</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bytes</span>
<a name="line-195"></a>
<a name="line-196"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-varid'>maxN</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>decodeAll</span>
<a name="line-197"></a> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-varid'>maxN</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>decodeTo</span> <span class='hs-varid'>n</span>
<a name="line-198"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span>
<a name="line-199"></a> <span class='hs-varid'>req</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>utf16Required</span>
<a name="line-200"></a> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varid'>bytes</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-201"></a> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varid'>bytes</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-202"></a> <span class='hs-varid'>decodeMore</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-varid'>req</span>
<a name="line-203"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-varid'>req</span> <span class='hs-varop'>></span> <span class='hs-varid'>maxN</span>
<a name="line-204"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>decodeTo</span> <span class='hs-varid'>n</span>
<a name="line-205"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>decodeMore</span>
<a name="line-206"></a>
<a name="line-207"></a> <span class='hs-varid'>decodeTo</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>first</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf16LE</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>n</span> <span class='hs-varid'>bytes</span><span class='hs-layout'>)</span>
<a name="line-208"></a> <span class='hs-varid'>decodeAll</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf16LE</span> <span class='hs-varid'>bytes</span><span class='hs-layout'>,</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>)</span>
<a name="line-209"></a>
<a name="line-210"></a><a name="utf16_be"></a><span class='hs-comment'>-- |</span>
<a name="line-211"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-212"></a><span class='hs-definition'>utf16_be</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Codec</span>
<a name="line-213"></a><span class='hs-definition'>utf16_be</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Codec</span> <span class='hs-varid'>name</span> <span class='hs-varid'>enc</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>where</span>
<a name="line-214"></a> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-str'>"UTF-16-BE"</span>
<a name="line-215"></a> <span class='hs-varid'>enc</span> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>encodeUtf16BE</span> <span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-216"></a> <span class='hs-varid'>dec</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>splitQuickly</span> <span class='hs-varid'>bytes</span> <span class='hs-keyword'>of</span>
<a name="line-217"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span>
<a name="line-218"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>splitSlowly</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf16BE</span> <span class='hs-varid'>bytes</span>
<a name="line-219"></a>
<a name="line-220"></a> <span class='hs-varid'>splitQuickly</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybeDecode</span> <span class='hs-layout'>(</span><span class='hs-varid'>loop</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-221"></a> <span class='hs-varid'>maxN</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bytes</span>
<a name="line-222"></a>
<a name="line-223"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-varid'>maxN</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>decodeAll</span>
<a name="line-224"></a> <span class='hs-keyglyph'>|</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>==</span> <span class='hs-varid'>maxN</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>decodeTo</span> <span class='hs-varid'>n</span>
<a name="line-225"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span>
<a name="line-226"></a> <span class='hs-varid'>req</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>utf16Required</span>
<a name="line-227"></a> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varid'>bytes</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-228"></a> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>index</span> <span class='hs-varid'>bytes</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-229"></a> <span class='hs-varid'>decodeMore</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-varid'>req</span>
<a name="line-230"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>n</span> <span class='hs-varop'>+</span> <span class='hs-varid'>req</span> <span class='hs-varop'>></span> <span class='hs-varid'>maxN</span>
<a name="line-231"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>decodeTo</span> <span class='hs-varid'>n</span>
<a name="line-232"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>decodeMore</span>
<a name="line-233"></a>
<a name="line-234"></a> <span class='hs-varid'>decodeTo</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>first</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf16BE</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>n</span> <span class='hs-varid'>bytes</span><span class='hs-layout'>)</span>
<a name="line-235"></a> <span class='hs-varid'>decodeAll</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf16BE</span> <span class='hs-varid'>bytes</span><span class='hs-layout'>,</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>)</span>
<a name="line-236"></a>
<a name="line-237"></a><a name="utf16Required"></a><span class='hs-definition'>utf16Required</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-238"></a><span class='hs-definition'>utf16Required</span> <span class='hs-varid'>x0</span> <span class='hs-varid'>x1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>required</span> <span class='hs-keyword'>where</span>
<a name="line-239"></a> <span class='hs-varid'>required</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>x</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0xD800</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>x</span> <span class='hs-varop'><=</span> <span class='hs-num'>0xDBFF</span>
<a name="line-240"></a> <span class='hs-keyword'>then</span> <span class='hs-num'>4</span>
<a name="line-241"></a> <span class='hs-keyword'>else</span> <span class='hs-num'>2</span>
<a name="line-242"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word16</span>
<a name="line-243"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>x1</span> <span class='hs-varop'>`shiftL`</span> <span class='hs-num'>8</span><span class='hs-layout'>)</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>x0</span>
<a name="line-244"></a>
<a name="line-245"></a><a name="utf32_le"></a><span class='hs-comment'>-- |</span>
<a name="line-246"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-247"></a><span class='hs-definition'>utf32_le</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Codec</span>
<a name="line-248"></a><span class='hs-definition'>utf32_le</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Codec</span> <span class='hs-varid'>name</span> <span class='hs-varid'>enc</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>where</span>
<a name="line-249"></a> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-str'>"UTF-32-LE"</span>
<a name="line-250"></a> <span class='hs-varid'>enc</span> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>encodeUtf32LE</span> <span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-251"></a> <span class='hs-varid'>dec</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>utf32SplitBytes</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf32LE</span> <span class='hs-varid'>bs</span> <span class='hs-keyword'>of</span>
<a name="line-252"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span>
<a name="line-253"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>splitSlowly</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf32LE</span> <span class='hs-varid'>bs</span>
<a name="line-254"></a>
<a name="line-255"></a><a name="utf32_be"></a><span class='hs-comment'>-- |</span>
<a name="line-256"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-257"></a><span class='hs-definition'>utf32_be</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Codec</span>
<a name="line-258"></a><span class='hs-definition'>utf32_be</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Codec</span> <span class='hs-varid'>name</span> <span class='hs-varid'>enc</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>where</span>
<a name="line-259"></a> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-str'>"UTF-32-BE"</span>
<a name="line-260"></a> <span class='hs-varid'>enc</span> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>encodeUtf32BE</span> <span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Nothing</span><span class='hs-layout'>)</span>
<a name="line-261"></a> <span class='hs-varid'>dec</span> <span class='hs-varid'>bs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>utf32SplitBytes</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf32BE</span> <span class='hs-varid'>bs</span> <span class='hs-keyword'>of</span>
<a name="line-262"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-conid'>Right</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span>
<a name="line-263"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>splitSlowly</span> <span class='hs-conid'>TE</span><span class='hs-varop'>.</span><span class='hs-varid'>decodeUtf32BE</span> <span class='hs-varid'>bs</span>
<a name="line-264"></a>
<a name="line-265"></a><a name="utf32SplitBytes"></a><span class='hs-definition'>utf32SplitBytes</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-266"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span>
<a name="line-267"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-layout'>,</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-conid'>ByteString</span><span class='hs-layout'>)</span>
<a name="line-268"></a><span class='hs-definition'>utf32SplitBytes</span> <span class='hs-varid'>dec</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>split</span> <span class='hs-keyword'>where</span>
<a name="line-269"></a> <span class='hs-varid'>split</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybeDecode</span> <span class='hs-layout'>(</span><span class='hs-varid'>dec</span> <span class='hs-varid'>toDecode</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span>
<a name="line-270"></a> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>bytes</span>
<a name="line-271"></a> <span class='hs-varid'>lenExtra</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mod</span> <span class='hs-varid'>len</span> <span class='hs-num'>4</span>
<a name="line-272"></a>
<a name="line-273"></a> <span class='hs-varid'>lenToDecode</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>len</span> <span class='hs-comment'>-</span> <span class='hs-varid'>lenExtra</span>
<a name="line-274"></a> <span class='hs-layout'>(</span><span class='hs-varid'>toDecode</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>lenExtra</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-275"></a> <span class='hs-keyword'>then</span> <span class='hs-layout'>(</span><span class='hs-varid'>bytes</span><span class='hs-layout'>,</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>)</span>
<a name="line-276"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>splitAt</span> <span class='hs-varid'>lenToDecode</span> <span class='hs-varid'>bytes</span>
<a name="line-277"></a>
<a name="line-278"></a><a name="ascii"></a><span class='hs-comment'>-- |</span>
<a name="line-279"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-280"></a><span class='hs-definition'>ascii</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Codec</span>
<a name="line-281"></a><span class='hs-definition'>ascii</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Codec</span> <span class='hs-varid'>name</span> <span class='hs-varid'>enc</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>where</span>
<a name="line-282"></a> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-str'>"ASCII"</span>
<a name="line-283"></a> <span class='hs-varid'>enc</span> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>bytes</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-284"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>safe</span><span class='hs-layout'>,</span> <span class='hs-keyword'>unsafe</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>span</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>ord</span> <span class='hs-varid'>c</span> <span class='hs-varop'><=</span> <span class='hs-num'>0x7F</span><span class='hs-layout'>)</span> <span class='hs-varid'>text</span>
<a name="line-285"></a> <span class='hs-varid'>bytes</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-layout'>(</span><span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>unpack</span> <span class='hs-keyword'>safe</span><span class='hs-layout'>)</span>
<a name="line-286"></a> <span class='hs-varid'>extra</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-keyword'>unsafe</span>
<a name="line-287"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Nothing</span>
<a name="line-288"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>EncodeException</span> <span class='hs-varid'>ascii</span> <span class='hs-layout'>(</span><span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>head</span> <span class='hs-keyword'>unsafe</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-keyword'>unsafe</span><span class='hs-layout'>)</span>
<a name="line-289"></a>
<a name="line-290"></a> <span class='hs-varid'>dec</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>text</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-291"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>safe</span><span class='hs-layout'>,</span> <span class='hs-keyword'>unsafe</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>span</span> <span class='hs-layout'>(</span><span class='hs-varop'><=</span> <span class='hs-num'>0x7F</span><span class='hs-layout'>)</span> <span class='hs-varid'>bytes</span>
<a name="line-292"></a> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-layout'>(</span><span class='hs-conid'>B8</span><span class='hs-varop'>.</span><span class='hs-varid'>unpack</span> <span class='hs-keyword'>safe</span><span class='hs-layout'>)</span>
<a name="line-293"></a> <span class='hs-varid'>extra</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-keyword'>unsafe</span>
<a name="line-294"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Right</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span>
<a name="line-295"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Left</span> <span class='hs-layout'>(</span><span class='hs-conid'>DecodeException</span> <span class='hs-varid'>ascii</span> <span class='hs-layout'>(</span><span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>head</span> <span class='hs-keyword'>unsafe</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-keyword'>unsafe</span><span class='hs-layout'>)</span>
<a name="line-296"></a>
<a name="line-297"></a><a name="iso8859_1"></a><span class='hs-comment'>-- |</span>
<a name="line-298"></a><span class='hs-comment'>-- Since 0.2.0</span>
<a name="line-299"></a><span class='hs-definition'>iso8859_1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Codec</span>
<a name="line-300"></a><span class='hs-definition'>iso8859_1</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Codec</span> <span class='hs-varid'>name</span> <span class='hs-varid'>enc</span> <span class='hs-varid'>dec</span> <span class='hs-keyword'>where</span>
<a name="line-301"></a> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-str'>"ISO-8859-1"</span>
<a name="line-302"></a> <span class='hs-varid'>enc</span> <span class='hs-varid'>text</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>bytes</span><span class='hs-layout'>,</span> <span class='hs-varid'>extra</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-303"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>safe</span><span class='hs-layout'>,</span> <span class='hs-keyword'>unsafe</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>span</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>ord</span> <span class='hs-varid'>c</span> <span class='hs-varop'><=</span> <span class='hs-num'>0xFF</span><span class='hs-layout'>)</span> <span class='hs-varid'>text</span>
<a name="line-304"></a> <span class='hs-varid'>bytes</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-layout'>(</span><span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>unpack</span> <span class='hs-keyword'>safe</span><span class='hs-layout'>)</span>
<a name="line-305"></a> <span class='hs-varid'>extra</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-keyword'>unsafe</span>
<a name="line-306"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>Nothing</span>
<a name="line-307"></a> <span class='hs-keyword'>else</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>EncodeException</span> <span class='hs-varid'>iso8859_1</span> <span class='hs-layout'>(</span><span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>head</span> <span class='hs-keyword'>unsafe</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-keyword'>unsafe</span><span class='hs-layout'>)</span>
<a name="line-308"></a>
<a name="line-309"></a> <span class='hs-varid'>dec</span> <span class='hs-varid'>bytes</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>T</span><span class='hs-varop'>.</span><span class='hs-varid'>pack</span> <span class='hs-layout'>(</span><span class='hs-conid'>B8</span><span class='hs-varop'>.</span><span class='hs-varid'>unpack</span> <span class='hs-varid'>bytes</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Right</span> <span class='hs-conid'>B</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span><span class='hs-layout'>)</span>
<a name="line-310"></a>
<a name="line-311"></a><a name="tryEvaluate"></a><span class='hs-definition'>tryEvaluate</span> <span class='hs-keyglyph'>::</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>TextException</span> <span class='hs-varid'>a</span>
<a name="line-312"></a><span class='hs-definition'>tryEvaluate</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafePerformIO</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Exc</span><span class='hs-varop'>.</span><span class='hs-varid'>try</span> <span class='hs-varop'>.</span> <span class='hs-conid'>Exc</span><span class='hs-varop'>.</span><span class='hs-varid'>evaluate</span>
<a name="line-313"></a>
<a name="line-314"></a><a name="maybeDecode"></a><span class='hs-definition'>maybeDecode</span><span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-315"></a><span class='hs-definition'>maybeDecode</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>tryEvaluate</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>of</span>
<a name="line-316"></a> <span class='hs-conid'>Left</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-317"></a> <span class='hs-conid'>Right</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
</pre></body>
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