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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a><span class='hs-cpp'>#if __GLASGOW_HASKELL__ >= 701</span>
<a name="line-3"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span>
<a name="line-4"></a><span class='hs-cpp'>#endif</span>
<a name="line-5"></a><span class='hs-comment'>--</span>
<a name="line-6"></a><span class='hs-comment'>-- |</span>
<a name="line-7"></a><span class='hs-comment'>-- Module : Codec.Binary.UTF8.String</span>
<a name="line-8"></a><span class='hs-comment'>-- Copyright : (c) Eric Mertens 2007</span>
<a name="line-9"></a><span class='hs-comment'>-- License : BSD3-style (see LICENSE)</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- Maintainer: emertens@galois.com</span>
<a name="line-12"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-13"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-- Support for encoding UTF8 Strings to and from @[Word8]@</span>
<a name="line-16"></a><span class='hs-comment'>--</span>
<a name="line-17"></a>
<a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Codec</span><span class='hs-varop'>.</span><span class='hs-conid'>Binary</span><span class='hs-varop'>.</span><span class='hs-conid'>UTF8</span><span class='hs-varop'>.</span><span class='hs-conid'>String</span> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-varid'>encode</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>decode</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>encodeString</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>decodeString</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>encodeChar</span>
<a name="line-24"></a>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isUTF8Encoded</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>utf8Encode</span>
<a name="line-27"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-28"></a>
<a name="line-29"></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'>Word32</span><span class='hs-layout'>)</span>
<a name="line-30"></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><span class='hs-varid'>shiftR</span><span class='hs-layout'>)</span>
<a name="line-31"></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'>chr</span><span class='hs-layout'>,</span><span class='hs-varid'>ord</span><span class='hs-layout'>)</span>
<a name="line-32"></a>
<a name="line-33"></a><span class='hs-keyword'>default</span><span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-34"></a>
<a name="line-35"></a><a name="encodeString"></a><span class='hs-comment'>-- | Encode a string using 'encode' and store the result in a 'String'.</span>
<a name="line-36"></a><span class='hs-definition'>encodeString</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-37"></a><span class='hs-definition'>encodeString</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>toEnum</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromEnum</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>encode</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-38"></a>
<a name="line-39"></a><a name="decodeString"></a><span class='hs-comment'>-- | Decode a string using 'decode' using a 'String' as input.</span>
<a name="line-40"></a><span class='hs-comment'>-- | This is not safe but it is necessary if UTF-8 encoded text</span>
<a name="line-41"></a><span class='hs-comment'>-- | has been loaded into a 'String' prior to being decoded.</span>
<a name="line-42"></a><span class='hs-definition'>decodeString</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-43"></a><span class='hs-definition'>decodeString</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>decode</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>toEnum</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromEnum</span><span class='hs-layout'>)</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span>
<a name="line-44"></a>
<a name="line-45"></a><a name="replacement_character"></a><span class='hs-definition'>replacement_character</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span>
<a name="line-46"></a><span class='hs-definition'>replacement_character</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'\xfffd'</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="encodeChar"></a><span class='hs-comment'>-- | Encode a single Haskell Char to a list of Word8 values, in UTF8 format.</span>
<a name="line-49"></a><span class='hs-definition'>encodeChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Word8</span><span class='hs-keyglyph'>]</span>
<a name="line-50"></a><span class='hs-definition'>encodeChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>map</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>.</span> <span class='hs-varid'>go</span> <span class='hs-varop'>.</span> <span class='hs-varid'>ord</span>
<a name="line-51"></a> <span class='hs-keyword'>where</span>
<a name="line-52"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>oc</span>
<a name="line-53"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>oc</span> <span class='hs-varop'><=</span> <span class='hs-num'>0x7f</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>oc</span><span class='hs-keyglyph'>]</span>
<a name="line-54"></a>
<a name="line-55"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>oc</span> <span class='hs-varop'><=</span> <span class='hs-num'>0x7ff</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-num'>0xc0</span> <span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-varid'>oc</span> <span class='hs-varop'>`shiftR`</span> <span class='hs-num'>6</span><span class='hs-layout'>)</span>
<a name="line-56"></a> <span class='hs-layout'>,</span> <span class='hs-num'>0x80</span> <span class='hs-varop'>+</span> <span class='hs-varid'>oc</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3f</span>
<a name="line-57"></a> <span class='hs-keyglyph'>]</span>
<a name="line-58"></a>
<a name="line-59"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>oc</span> <span class='hs-varop'><=</span> <span class='hs-num'>0xffff</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-num'>0xe0</span> <span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-varid'>oc</span> <span class='hs-varop'>`shiftR`</span> <span class='hs-num'>12</span><span class='hs-layout'>)</span>
<a name="line-60"></a> <span class='hs-layout'>,</span> <span class='hs-num'>0x80</span> <span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>oc</span> <span class='hs-varop'>`shiftR`</span> <span class='hs-num'>6</span><span class='hs-layout'>)</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3f</span><span class='hs-layout'>)</span>
<a name="line-61"></a> <span class='hs-layout'>,</span> <span class='hs-num'>0x80</span> <span class='hs-varop'>+</span> <span class='hs-varid'>oc</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3f</span>
<a name="line-62"></a> <span class='hs-keyglyph'>]</span>
<a name="line-63"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span> <span class='hs-num'>0xf0</span> <span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-varid'>oc</span> <span class='hs-varop'>`shiftR`</span> <span class='hs-num'>18</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-layout'>,</span> <span class='hs-num'>0x80</span> <span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>oc</span> <span class='hs-varop'>`shiftR`</span> <span class='hs-num'>12</span><span class='hs-layout'>)</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3f</span><span class='hs-layout'>)</span>
<a name="line-65"></a> <span class='hs-layout'>,</span> <span class='hs-num'>0x80</span> <span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>oc</span> <span class='hs-varop'>`shiftR`</span> <span class='hs-num'>6</span><span class='hs-layout'>)</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3f</span><span class='hs-layout'>)</span>
<a name="line-66"></a> <span class='hs-layout'>,</span> <span class='hs-num'>0x80</span> <span class='hs-varop'>+</span> <span class='hs-varid'>oc</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3f</span>
<a name="line-67"></a> <span class='hs-keyglyph'>]</span>
<a name="line-68"></a>
<a name="line-69"></a>
<a name="line-70"></a><a name="encode"></a><span class='hs-comment'>-- | Encode a Haskell String to a list of Word8 values, in UTF8 format.</span>
<a name="line-71"></a><span class='hs-definition'>encode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Word8</span><span class='hs-keyglyph'>]</span>
<a name="line-72"></a><span class='hs-definition'>encode</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concatMap</span> <span class='hs-varid'>encodeChar</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="decode"></a><span class='hs-comment'>--</span>
<a name="line-75"></a><span class='hs-comment'>-- | Decode a UTF8 string packed into a list of Word8 values, directly to String</span>
<a name="line-76"></a><span class='hs-comment'>--</span>
<a name="line-77"></a><span class='hs-definition'>decode</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Word8</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-78"></a><span class='hs-definition'>decode</span> <span class='hs-keyglyph'>[</span> <span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>""</span>
<a name="line-79"></a><span class='hs-definition'>decode</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-80"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'><</span> <span class='hs-num'>0x80</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>chr</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromEnum</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-conop'>:</span> <span class='hs-varid'>decode</span> <span class='hs-varid'>cs</span>
<a name="line-81"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'><</span> <span class='hs-num'>0xc0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replacement_character</span> <span class='hs-conop'>:</span> <span class='hs-varid'>decode</span> <span class='hs-varid'>cs</span>
<a name="line-82"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'><</span> <span class='hs-num'>0xe0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multi1</span>
<a name="line-83"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'><</span> <span class='hs-num'>0xf0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multi_byte</span> <span class='hs-num'>2</span> <span class='hs-num'>0xf</span> <span class='hs-num'>0x800</span>
<a name="line-84"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'><</span> <span class='hs-num'>0xf8</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multi_byte</span> <span class='hs-num'>3</span> <span class='hs-num'>0x7</span> <span class='hs-num'>0x10000</span>
<a name="line-85"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'><</span> <span class='hs-num'>0xfc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multi_byte</span> <span class='hs-num'>4</span> <span class='hs-num'>0x3</span> <span class='hs-num'>0x200000</span>
<a name="line-86"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'><</span> <span class='hs-num'>0xfe</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>multi_byte</span> <span class='hs-num'>5</span> <span class='hs-num'>0x1</span> <span class='hs-num'>0x4000000</span>
<a name="line-87"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replacement_character</span> <span class='hs-conop'>:</span> <span class='hs-varid'>decode</span> <span class='hs-varid'>cs</span>
<a name="line-88"></a> <span class='hs-keyword'>where</span>
<a name="line-89"></a> <span class='hs-varid'>multi1</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>cs</span> <span class='hs-keyword'>of</span>
<a name="line-90"></a> <span class='hs-varid'>c1</span> <span class='hs-conop'>:</span> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c1</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0xc0</span> <span class='hs-varop'>==</span> <span class='hs-num'>0x80</span> <span class='hs-keyglyph'>-></span>
<a name="line-91"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>fromEnum</span> <span class='hs-varid'>c</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x1f</span><span class='hs-layout'>)</span> <span class='hs-varop'>`shiftL`</span> <span class='hs-num'>6</span><span class='hs-layout'>)</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>fromEnum</span> <span class='hs-layout'>(</span><span class='hs-varid'>c1</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3f</span><span class='hs-layout'>)</span>
<a name="line-92"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>d</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0x000080</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>toEnum</span> <span class='hs-varid'>d</span> <span class='hs-conop'>:</span> <span class='hs-varid'>decode</span> <span class='hs-varid'>ds</span>
<a name="line-93"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>replacement_character</span> <span class='hs-conop'>:</span> <span class='hs-varid'>decode</span> <span class='hs-varid'>ds</span>
<a name="line-94"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>replacement_character</span> <span class='hs-conop'>:</span> <span class='hs-varid'>decode</span> <span class='hs-varid'>cs</span>
<a name="line-95"></a>
<a name="line-96"></a> <span class='hs-varid'>multi_byte</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span>
<a name="line-97"></a> <span class='hs-varid'>multi_byte</span> <span class='hs-varid'>i</span> <span class='hs-varid'>mask</span> <span class='hs-varid'>overlong</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>aux</span> <span class='hs-varid'>i</span> <span class='hs-varid'>cs</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromEnum</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varop'>.&.</span> <span class='hs-varid'>mask</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-98"></a> <span class='hs-keyword'>where</span>
<a name="line-99"></a> <span class='hs-varid'>aux</span> <span class='hs-num'>0</span> <span class='hs-varid'>rs</span> <span class='hs-varid'>acc</span>
<a name="line-100"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>overlong</span> <span class='hs-varop'><=</span> <span class='hs-varid'>acc</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>acc</span> <span class='hs-varop'><=</span> <span class='hs-num'>0x10ffff</span> <span class='hs-varop'>&&</span>
<a name="line-101"></a> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span> <span class='hs-varop'><</span> <span class='hs-num'>0xd800</span> <span class='hs-varop'>||</span> <span class='hs-num'>0xdfff</span> <span class='hs-varop'><</span> <span class='hs-varid'>acc</span><span class='hs-layout'>)</span> <span class='hs-varop'>&&</span>
<a name="line-102"></a> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span> <span class='hs-varop'><</span> <span class='hs-num'>0xfffe</span> <span class='hs-varop'>||</span> <span class='hs-num'>0xffff</span> <span class='hs-varop'><</span> <span class='hs-varid'>acc</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>chr</span> <span class='hs-varid'>acc</span> <span class='hs-conop'>:</span> <span class='hs-varid'>decode</span> <span class='hs-varid'>rs</span>
<a name="line-103"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replacement_character</span> <span class='hs-conop'>:</span> <span class='hs-varid'>decode</span> <span class='hs-varid'>rs</span>
<a name="line-104"></a>
<a name="line-105"></a> <span class='hs-varid'>aux</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-conop'>:</span><span class='hs-varid'>rs</span><span class='hs-layout'>)</span> <span class='hs-varid'>acc</span>
<a name="line-106"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>r</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0xc0</span> <span class='hs-varop'>==</span> <span class='hs-num'>0x80</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>aux</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> <span class='hs-varid'>rs</span>
<a name="line-107"></a> <span class='hs-varop'>$</span> <span class='hs-varid'>shiftL</span> <span class='hs-varid'>acc</span> <span class='hs-num'>6</span> <span class='hs-varop'>.|.</span> <span class='hs-varid'>fromEnum</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3f</span><span class='hs-layout'>)</span>
<a name="line-108"></a>
<a name="line-109"></a> <span class='hs-varid'>aux</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>rs</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>replacement_character</span> <span class='hs-conop'>:</span> <span class='hs-varid'>decode</span> <span class='hs-varid'>rs</span>
<a name="line-110"></a>
<a name="line-111"></a>
<a name="line-112"></a><a name="utf8Encode"></a><span class='hs-comment'>-- | @utf8Encode str@ is a convenience function; checks to see if</span>
<a name="line-113"></a><span class='hs-comment'>-- @str@ isn't UTF-8 encoded before doing so. Sometimes useful, but</span>
<a name="line-114"></a><span class='hs-comment'>-- you are better off keeping track of the encoding so as to avoid</span>
<a name="line-115"></a><span class='hs-comment'>-- the cost of checking.</span>
<a name="line-116"></a><span class='hs-definition'>utf8Encode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-117"></a><span class='hs-definition'>utf8Encode</span> <span class='hs-varid'>str</span>
<a name="line-118"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isUTF8Encoded</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>str</span>
<a name="line-119"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>encodeString</span> <span class='hs-varid'>str</span>
<a name="line-120"></a>
<a name="line-121"></a>
<a name="line-122"></a><a name="isUTF8Encoded"></a><span class='hs-comment'>-- | @isUTF8Encoded str@ tries to recognize input string as being in UTF-8 form.</span>
<a name="line-123"></a><span class='hs-definition'>isUTF8Encoded</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-124"></a><span class='hs-definition'>isUTF8Encoded</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-125"></a><span class='hs-definition'>isUTF8Encoded</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-126"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>ox</span> <span class='hs-keyword'>of</span>
<a name="line-127"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ox</span> <span class='hs-varop'><</span> <span class='hs-num'>0x80</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>isUTF8Encoded</span> <span class='hs-varid'>xs</span>
<a name="line-128"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ox</span> <span class='hs-varop'>></span> <span class='hs-num'>0xff</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-129"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ox</span> <span class='hs-varop'><</span> <span class='hs-num'>0xc0</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-130"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ox</span> <span class='hs-varop'><</span> <span class='hs-num'>0xe0</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check1</span>
<a name="line-131"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ox</span> <span class='hs-varop'><</span> <span class='hs-num'>0xf0</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check_byte</span> <span class='hs-num'>2</span> <span class='hs-num'>0xf</span> <span class='hs-num'>0</span>
<a name="line-132"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ox</span> <span class='hs-varop'><</span> <span class='hs-num'>0xf8</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check_byte</span> <span class='hs-num'>3</span> <span class='hs-num'>0x7</span> <span class='hs-num'>0x10000</span>
<a name="line-133"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ox</span> <span class='hs-varop'><</span> <span class='hs-num'>0xfc</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check_byte</span> <span class='hs-num'>4</span> <span class='hs-num'>0x3</span> <span class='hs-num'>0x200000</span>
<a name="line-134"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ox</span> <span class='hs-varop'><</span> <span class='hs-num'>0xfe</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>check_byte</span> <span class='hs-num'>5</span> <span class='hs-num'>0x1</span> <span class='hs-num'>0x4000000</span>
<a name="line-135"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-136"></a> <span class='hs-keyword'>where</span>
<a name="line-137"></a> <span class='hs-varid'>ox</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toW32</span> <span class='hs-varid'>x</span>
<a name="line-138"></a>
<a name="line-139"></a> <span class='hs-varid'>toW32</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word32</span>
<a name="line-140"></a> <span class='hs-varid'>toW32</span> <span class='hs-varid'>ch</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromEnum</span> <span class='hs-varid'>ch</span><span class='hs-layout'>)</span>
<a name="line-141"></a>
<a name="line-142"></a> <span class='hs-varid'>check1</span> <span class='hs-keyglyph'>=</span>
<a name="line-143"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>of</span>
<a name="line-144"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-145"></a> <span class='hs-varid'>c1</span> <span class='hs-conop'>:</span> <span class='hs-varid'>ds</span>
<a name="line-146"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>oc</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0xc0</span> <span class='hs-varop'>/=</span> <span class='hs-num'>0x80</span> <span class='hs-varop'>||</span> <span class='hs-varid'>d</span> <span class='hs-varop'><</span> <span class='hs-num'>0x000080</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-147"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>isUTF8Encoded</span> <span class='hs-varid'>ds</span>
<a name="line-148"></a> <span class='hs-keyword'>where</span>
<a name="line-149"></a> <span class='hs-varid'>oc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toW32</span> <span class='hs-varid'>c1</span>
<a name="line-150"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>ox</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x1f</span><span class='hs-layout'>)</span> <span class='hs-varop'>`shiftL`</span> <span class='hs-num'>6</span><span class='hs-layout'>)</span> <span class='hs-varop'>.|.</span> <span class='hs-layout'>(</span><span class='hs-varid'>oc</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3f</span><span class='hs-layout'>)</span>
<a name="line-151"></a>
<a name="line-152"></a> <span class='hs-varid'>check_byte</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word32</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word32</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-153"></a> <span class='hs-varid'>check_byte</span> <span class='hs-varid'>i</span> <span class='hs-varid'>mask</span> <span class='hs-varid'>overlong</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>aux</span> <span class='hs-varid'>i</span> <span class='hs-varid'>xs</span> <span class='hs-layout'>(</span><span class='hs-varid'>ox</span> <span class='hs-varop'>.&.</span> <span class='hs-varid'>mask</span><span class='hs-layout'>)</span>
<a name="line-154"></a> <span class='hs-keyword'>where</span>
<a name="line-155"></a> <span class='hs-varid'>aux</span> <span class='hs-num'>0</span> <span class='hs-varid'>rs</span> <span class='hs-varid'>acc</span>
<a name="line-156"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>overlong</span> <span class='hs-varop'><=</span> <span class='hs-varid'>acc</span> <span class='hs-varop'>&&</span>
<a name="line-157"></a> <span class='hs-varid'>acc</span> <span class='hs-varop'><=</span> <span class='hs-num'>0x10ffff</span> <span class='hs-varop'>&&</span>
<a name="line-158"></a> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span> <span class='hs-varop'><</span> <span class='hs-num'>0xd800</span> <span class='hs-varop'>||</span> <span class='hs-num'>0xdfff</span> <span class='hs-varop'><</span> <span class='hs-varid'>acc</span><span class='hs-layout'>)</span> <span class='hs-varop'>&&</span>
<a name="line-159"></a> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span> <span class='hs-varop'><</span> <span class='hs-num'>0xfffe</span> <span class='hs-varop'>||</span> <span class='hs-num'>0xffff</span> <span class='hs-varop'><</span> <span class='hs-varid'>acc</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isUTF8Encoded</span> <span class='hs-varid'>rs</span>
<a name="line-160"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-161"></a>
<a name="line-162"></a> <span class='hs-varid'>aux</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-conop'>:</span><span class='hs-varid'>rs</span><span class='hs-layout'>)</span> <span class='hs-varid'>acc</span>
<a name="line-163"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>toW32</span> <span class='hs-varid'>r</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0xc0</span> <span class='hs-varop'>==</span> <span class='hs-num'>0x80</span> <span class='hs-keyglyph'>=</span>
<a name="line-164"></a> <span class='hs-varid'>aux</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> <span class='hs-varid'>rs</span> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span> <span class='hs-varop'>`shiftL`</span> <span class='hs-num'>6</span> <span class='hs-varop'>.|.</span> <span class='hs-layout'>(</span><span class='hs-varid'>toW32</span> <span class='hs-varid'>r</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3f</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-165"></a>
<a name="line-166"></a> <span class='hs-varid'>aux</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-167"></a>
</pre></body>
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