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<title>Data/Text/Internal/Unsafe/Char.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP, MagicHash #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Data.Text.Internal.Unsafe.Char</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) 2008, 2009 Tom Harper,</span>
<a name="line-6"></a><span class='hs-comment'>-- (c) 2009, 2010 Bryan O'Sullivan,</span>
<a name="line-7"></a><span class='hs-comment'>-- (c) 2009 Duncan Coutts</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-10"></a><span class='hs-comment'>-- Maintainer : bos@serpentine.com</span>
<a name="line-11"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-12"></a><span class='hs-comment'>-- Portability : GHC</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- /Warning/: this is an internal module, and does not have a stable</span>
<a name="line-15"></a><span class='hs-comment'>-- API or name. Functions in this module may not check or enforce</span>
<a name="line-16"></a><span class='hs-comment'>-- preconditions expected by public modules. Use at your own risk!</span>
<a name="line-17"></a><span class='hs-comment'>--</span>
<a name="line-18"></a><span class='hs-comment'>-- Fast character manipulation functions.</span>
<a name="line-19"></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'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span>
<a name="line-20"></a> <span class='hs-layout'>(</span>
<a name="line-21"></a> <span class='hs-varid'>ord</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unsafeChr</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unsafeChr8</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unsafeChr32</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unsafeWrite</span>
<a name="line-26"></a> <span class='hs-comment'>-- , unsafeWriteRev</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-cpp'>#ifdef ASSERTS</span>
<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'>Exception</span> <span class='hs-layout'>(</span><span class='hs-varid'>assert</span><span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-cpp'>#endif</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'>ST</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</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>
<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'>Internal</span><span class='hs-varop'>.</span><span class='hs-conid'>Unsafe</span><span class='hs-varop'>.</span><span class='hs-conid'>Shift</span> <span class='hs-layout'>(</span><span class='hs-varid'>shiftR</span><span class='hs-layout'>)</span>
<a name="line-35"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>chr</span><span class='hs-cpp'>#</span><span class='hs-layout'>,</span> <span class='hs-varid'>ord</span><span class='hs-cpp'>#</span><span class='hs-layout'>,</span> <span class='hs-varid'>word2Int</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</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-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Word16</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Word32</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-37"></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-38"></a>
<a name="line-39"></a><a name="ord"></a><span class='hs-definition'>ord</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-40"></a><span class='hs-definition'>ord</span> <span class='hs-layout'>(</span><span class='hs-conid'>C</span><span class='hs-cpp'>#</span> <span class='hs-varid'>c</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>I</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>ord</span><span class='hs-cpp'>#</span> <span class='hs-varid'>c</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span>
<a name="line-41"></a><span class='hs-comment'>{-# INLINE ord #-}</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="unsafeChr"></a><span class='hs-definition'>unsafeChr</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word16</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-44"></a><span class='hs-definition'>unsafeChr</span> <span class='hs-layout'>(</span><span class='hs-conid'>W16</span><span class='hs-cpp'>#</span> <span class='hs-varid'>w</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>C</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>chr</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>word2Int</span><span class='hs-cpp'>#</span> <span class='hs-varid'>w</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-45"></a><span class='hs-comment'>{-# INLINE unsafeChr #-}</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="unsafeChr8"></a><span class='hs-definition'>unsafeChr8</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word8</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-48"></a><span class='hs-definition'>unsafeChr8</span> <span class='hs-layout'>(</span><span class='hs-conid'>W8</span><span class='hs-cpp'>#</span> <span class='hs-varid'>w</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>C</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>chr</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>word2Int</span><span class='hs-cpp'>#</span> <span class='hs-varid'>w</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-49"></a><span class='hs-comment'>{-# INLINE unsafeChr8 #-}</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="unsafeChr32"></a><span class='hs-definition'>unsafeChr32</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word32</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-52"></a><span class='hs-definition'>unsafeChr32</span> <span class='hs-layout'>(</span><span class='hs-conid'>W32</span><span class='hs-cpp'>#</span> <span class='hs-varid'>w</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>C</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>chr</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>word2Int</span><span class='hs-cpp'>#</span> <span class='hs-varid'>w</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-53"></a><span class='hs-comment'>{-# INLINE unsafeChr32 #-}</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="unsafeWrite"></a><span class='hs-comment'>-- | Write a character into the array at the given offset. Returns</span>
<a name="line-56"></a><span class='hs-comment'>-- the number of 'Word16's written.</span>
<a name="line-57"></a><span class='hs-definition'>unsafeWrite</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-conid'>MArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-conid'>Int</span>
<a name="line-58"></a><span class='hs-definition'>unsafeWrite</span> <span class='hs-varid'>marr</span> <span class='hs-varid'>i</span> <span class='hs-varid'>c</span>
<a name="line-59"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>0x10000</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-60"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-61"></a> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'><</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>marr</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-62"></a><span class='hs-cpp'>#endif</span>
<a name="line-63"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>marr</span> <span class='hs-varid'>i</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-varid'>return</span> <span class='hs-num'>1</span>
<a name="line-65"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-66"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-67"></a> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'><</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>marr</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-68"></a><span class='hs-cpp'>#endif</span>
<a name="line-69"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>marr</span> <span class='hs-varid'>i</span> <span class='hs-varid'>lo</span>
<a name="line-70"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>marr</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>hi</span>
<a name="line-71"></a> <span class='hs-varid'>return</span> <span class='hs-num'>2</span>
<a name="line-72"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ord</span> <span class='hs-varid'>c</span>
<a name="line-73"></a> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-num'>0x10000</span>
<a name="line-74"></a> <span class='hs-varid'>lo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varop'>`shiftR`</span> <span class='hs-num'>10</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-num'>0xD800</span>
<a name="line-75"></a> <span class='hs-varid'>hi</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3FF</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-num'>0xDC00</span>
<a name="line-76"></a><span class='hs-comment'>{-# INLINE unsafeWrite #-}</span>
<a name="line-77"></a>
<a name="line-78"></a><span class='hs-comment'>{-
<a name="line-79"></a>unsafeWriteRev :: A.MArray s Word16 -> Int -> Char -> ST s Int
<a name="line-80"></a>unsafeWriteRev marr i c
<a name="line-81"></a> | n < 0x10000 = do
<a name="line-82"></a> assert (i >= 0) . assert (i < A.length marr) $
<a name="line-83"></a> A.unsafeWrite marr i (fromIntegral n)
<a name="line-84"></a> return (i-1)
<a name="line-85"></a> | otherwise = do
<a name="line-86"></a> assert (i >= 1) . assert (i < A.length marr) $
<a name="line-87"></a> A.unsafeWrite marr (i-1) lo
<a name="line-88"></a> A.unsafeWrite marr i hi
<a name="line-89"></a> return (i-2)
<a name="line-90"></a> where n = ord c
<a name="line-91"></a> m = n - 0x10000
<a name="line-92"></a> lo = fromIntegral $ (m `shiftR` 10) + 0xD800
<a name="line-93"></a> hi = fromIntegral $ (m .&. 0x3FF) + 0xDC00
<a name="line-94"></a>{-# INLINE unsafeWriteRev #-}
<a name="line-95"></a>-}</span>
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