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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<title>Data/Text/Unsafe.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP, MagicHash, UnboxedTuples #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module      : Data.Text.Unsafe</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright   : (c) 2009, 2010, 2011 Bryan O'Sullivan</span>
<a name="line-5"></a><span class='hs-comment'>-- License     : BSD-style</span>
<a name="line-6"></a><span class='hs-comment'>-- Maintainer  : bos@serpentine.com, rtomharper@googlemail.com,</span>
<a name="line-7"></a><span class='hs-comment'>--               duncan@haskell.org</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability   : experimental</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- A module containing unsafe 'Text' operations, for very very careful</span>
<a name="line-12"></a><span class='hs-comment'>-- use in heavily tested code.</span>
<a name="line-13"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span>
<a name="line-14"></a>    <span class='hs-layout'>(</span>
<a name="line-15"></a>      <span class='hs-varid'>inlineInterleaveST</span>
<a name="line-16"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>inlinePerformIO</span>
<a name="line-17"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>Iter</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-18"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>iter</span>
<a name="line-19"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>iter_</span>
<a name="line-20"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>reverseIter</span>
<a name="line-21"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>unsafeHead</span>
<a name="line-22"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>unsafeTail</span>
<a name="line-23"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>lengthWord16</span>
<a name="line-24"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>takeWord16</span>
<a name="line-25"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>dropWord16</span>
<a name="line-26"></a>    <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-27"></a>     
<a name="line-28"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-29"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-varid'>assert</span><span class='hs-layout'>)</span>
<a name="line-30"></a><span class='hs-cpp'>#endif</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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Encoding</span><span class='hs-varop'>.</span><span class='hs-conid'>Utf16</span> <span class='hs-layout'>(</span><span class='hs-varid'>chr2</span><span class='hs-layout'>)</span>
<a name="line-32"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span><span class='hs-varop'>.</span><span class='hs-conid'>Base</span> <span class='hs-layout'>(</span><span class='hs-varid'>inlineInterleaveST</span><span class='hs-layout'>,</span> <span class='hs-varid'>inlinePerformIO</span><span class='hs-layout'>)</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>UnsafeChar</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeChr</span><span class='hs-layout'>)</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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>A</span>
<a name="line-36"></a>
<a name="line-37"></a><a name="unsafeHead"></a><span class='hs-comment'>-- | /O(1)/ A variant of 'head' for non-empty 'Text'. 'unsafeHead'</span>
<a name="line-38"></a><span class='hs-comment'>-- omits the check for the empty case, so there is an obligation on</span>
<a name="line-39"></a><span class='hs-comment'>-- the programmer to provide a proof that the 'Text' is non-empty.</span>
<a name="line-40"></a><span class='hs-definition'>unsafeHead</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Char</span>
<a name="line-41"></a><span class='hs-definition'>unsafeHead</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span>
<a name="line-42"></a>    <span class='hs-keyglyph'>|</span> <span class='hs-varid'>m</span> <span class='hs-varop'>&lt;</span> <span class='hs-num'>0xD800</span> <span class='hs-varop'>||</span> <span class='hs-varid'>m</span> <span class='hs-varop'>&gt;</span> <span class='hs-num'>0xDBFF</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unsafeChr</span> <span class='hs-varid'>m</span>
<a name="line-43"></a>    <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>                <span class='hs-keyglyph'>=</span> <span class='hs-varid'>chr2</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span>
<a name="line-44"></a>    <span class='hs-keyword'>where</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span>
<a name="line-45"></a>          <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-46"></a><span class='hs-comment'>{-# INLINE unsafeHead #-}</span>
<a name="line-47"></a>
<a name="line-48"></a><a name="unsafeTail"></a><span class='hs-comment'>-- | /O(1)/ A variant of 'tail' for non-empty 'Text'. 'unsafeHead'</span>
<a name="line-49"></a><span class='hs-comment'>-- omits the check for the empty case, so there is an obligation on</span>
<a name="line-50"></a><span class='hs-comment'>-- the programmer to provide a proof that the 'Text' is non-empty.</span>
<a name="line-51"></a><span class='hs-definition'>unsafeTail</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Text</span>
<a name="line-52"></a><span class='hs-definition'>unsafeTail</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-53"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-54"></a>    <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span> <span class='hs-varop'>&lt;=</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-55"></a><span class='hs-cpp'>#endif</span>
<a name="line-56"></a>    <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-57"></a>  <span class='hs-keyword'>where</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>iter_</span> <span class='hs-varid'>t</span> <span class='hs-num'>0</span>
<a name="line-58"></a><span class='hs-comment'>{-# INLINE unsafeTail #-}</span>
<a name="line-59"></a>
<a name="line-60"></a><a name="Iter"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Iter</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Iter</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Char</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="iter"></a><span class='hs-comment'>-- | /O(1)/ Iterate (unsafely) one step forwards through a UTF-16</span>
<a name="line-63"></a><span class='hs-comment'>-- array, returning the current character and the delta to add to give</span>
<a name="line-64"></a><span class='hs-comment'>-- the next offset to iterate at.</span>
<a name="line-65"></a><span class='hs-definition'>iter</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Iter</span>
<a name="line-66"></a><span class='hs-definition'>iter</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span>
<a name="line-67"></a>    <span class='hs-keyglyph'>|</span> <span class='hs-varid'>m</span> <span class='hs-varop'>&lt;</span> <span class='hs-num'>0xD800</span> <span class='hs-varop'>||</span> <span class='hs-varid'>m</span> <span class='hs-varop'>&gt;</span> <span class='hs-num'>0xDBFF</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Iter</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeChr</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-num'>1</span>
<a name="line-68"></a>    <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>                <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Iter</span> <span class='hs-layout'>(</span><span class='hs-varid'>chr2</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-num'>2</span>
<a name="line-69"></a>  <span class='hs-keyword'>where</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>j</span>
<a name="line-70"></a>        <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>k</span>
<a name="line-71"></a>        <span class='hs-varid'>j</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>off</span> <span class='hs-varop'>+</span> <span class='hs-varid'>i</span>
<a name="line-72"></a>        <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>j</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-73"></a><span class='hs-comment'>{-# INLINE iter #-}</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="iter_"></a><span class='hs-comment'>-- | /O(1)/ Iterate one step through a UTF-16 array, returning the</span>
<a name="line-76"></a><span class='hs-comment'>-- delta to add to give the next offset to iterate at.</span>
<a name="line-77"></a><span class='hs-definition'>iter_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Int</span>
<a name="line-78"></a><span class='hs-definition'>iter_</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>m</span> <span class='hs-varop'>&lt;</span> <span class='hs-num'>0xD800</span> <span class='hs-varop'>||</span> <span class='hs-varid'>m</span> <span class='hs-varop'>&gt;</span> <span class='hs-num'>0xDBFF</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>1</span>
<a name="line-79"></a>                            <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>                <span class='hs-keyglyph'>=</span> <span class='hs-num'>2</span>
<a name="line-80"></a>  <span class='hs-keyword'>where</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span>
<a name="line-81"></a><span class='hs-comment'>{-# INLINE iter_ #-}</span>
<a name="line-82"></a>
<a name="line-83"></a><a name="reverseIter"></a><span class='hs-comment'>-- | /O(1)/ Iterate one step backwards through a UTF-16 array,</span>
<a name="line-84"></a><span class='hs-comment'>-- returning the current character and the delta to add (i.e. a</span>
<a name="line-85"></a><span class='hs-comment'>-- negative number) to give the next offset to iterate at.</span>
<a name="line-86"></a><span class='hs-definition'>reverseIter</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span><span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-87"></a><span class='hs-definition'>reverseIter</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span>
<a name="line-88"></a>    <span class='hs-keyglyph'>|</span> <span class='hs-varid'>m</span> <span class='hs-varop'>&lt;</span> <span class='hs-num'>0xDC00</span> <span class='hs-varop'>||</span> <span class='hs-varid'>m</span> <span class='hs-varop'>&gt;</span> <span class='hs-num'>0xDFFF</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeChr</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-89"></a>    <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span>                <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>chr2</span> <span class='hs-varid'>n</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span>    <span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-90"></a>  <span class='hs-keyword'>where</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>j</span>
<a name="line-91"></a>        <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>k</span>
<a name="line-92"></a>        <span class='hs-varid'>j</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>off</span> <span class='hs-varop'>+</span> <span class='hs-varid'>i</span>
<a name="line-93"></a>        <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>j</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span>
<a name="line-94"></a><span class='hs-comment'>{-# INLINE reverseIter #-}</span>
<a name="line-95"></a>
<a name="line-96"></a><a name="lengthWord16"></a><span class='hs-comment'>-- | /O(1)/ Return the length of a 'Text' in units of 'Word16'.  This</span>
<a name="line-97"></a><span class='hs-comment'>-- is useful for sizing a target array appropriately before using</span>
<a name="line-98"></a><span class='hs-comment'>-- 'unsafeCopyToPtr'.</span>
<a name="line-99"></a><span class='hs-definition'>lengthWord16</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Int</span>
<a name="line-100"></a><span class='hs-definition'>lengthWord16</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-sel'>_arr</span> <span class='hs-sel'>_off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>len</span>
<a name="line-101"></a><span class='hs-comment'>{-# INLINE lengthWord16 #-}</span>
<a name="line-102"></a>
<a name="line-103"></a><a name="takeWord16"></a><span class='hs-comment'>-- | /O(1)/ Unchecked take of 'k' 'Word16's from the front of a 'Text'.</span>
<a name="line-104"></a><span class='hs-definition'>takeWord16</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Text</span>
<a name="line-105"></a><span class='hs-definition'>takeWord16</span> <span class='hs-varid'>k</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>k</span>
<a name="line-106"></a><span class='hs-comment'>{-# INLINE takeWord16 #-}</span>
<a name="line-107"></a>
<a name="line-108"></a><a name="dropWord16"></a><span class='hs-comment'>-- | /O(1)/ Unchecked drop of 'k' 'Word16's from the front of a 'Text'.</span>
<a name="line-109"></a><span class='hs-definition'>dropWord16</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-&gt;</span> <span class='hs-conid'>Text</span>
<a name="line-110"></a><span class='hs-definition'>dropWord16</span> <span class='hs-varid'>k</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>k</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>k</span><span class='hs-layout'>)</span>
<a name="line-111"></a><span class='hs-comment'>{-# INLINE dropWord16 #-}</span>
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