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<title>Data/Text/Internal/Encoding/Utf16.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE MagicHash, BangPatterns #-}</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.Encoding.Utf16</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 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'>-- Basic UTF-16 validation and character manipulation.</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'>Encoding</span><span class='hs-varop'>.</span><span class='hs-conid'>Utf16</span>
<a name="line-20"></a> <span class='hs-layout'>(</span>
<a name="line-21"></a> <span class='hs-varid'>chr2</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>validate1</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>validate2</span>
<a name="line-24"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-25"></a>
<a name="line-26"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>GHC</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span>
<a name="line-27"></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'>Word16</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-28"></a>
<a name="line-29"></a><a name="chr2"></a><span class='hs-definition'>chr2</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word16</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-30"></a><span class='hs-definition'>chr2</span> <span class='hs-layout'>(</span><span class='hs-conid'>W16</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>W16</span><span class='hs-cpp'>#</span> <span class='hs-varid'>b</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'>upper</span><span class='hs-cpp'>#</span> <span class='hs-varop'>+#</span> <span class='hs-varid'>lower</span><span class='hs-cpp'>#</span> <span class='hs-varop'>+#</span> <span class='hs-num'>0x10000</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-31"></a> <span class='hs-keyword'>where</span>
<a name="line-32"></a> <span class='hs-varop'>!</span><span class='hs-varid'>x</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>word2Int</span><span class='hs-cpp'>#</span> <span class='hs-varid'>a</span><span class='hs-cpp'>#</span>
<a name="line-33"></a> <span class='hs-varop'>!</span><span class='hs-varid'>y</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>word2Int</span><span class='hs-cpp'>#</span> <span class='hs-varid'>b</span><span class='hs-cpp'>#</span>
<a name="line-34"></a> <span class='hs-varop'>!</span><span class='hs-varid'>upper</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>uncheckedIShiftL</span><span class='hs-cpp'>#</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-cpp'>#</span> <span class='hs-varop'>-#</span> <span class='hs-num'>0xD800</span><span class='hs-cpp'>#</span><span class='hs-layout'>)</span> <span class='hs-num'>10</span><span class='hs-cpp'>#</span>
<a name="line-35"></a> <span class='hs-varop'>!</span><span class='hs-varid'>lower</span><span class='hs-cpp'>#</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>y</span><span class='hs-cpp'>#</span> <span class='hs-varop'>-#</span> <span class='hs-num'>0xDC00</span><span class='hs-cpp'>#</span>
<a name="line-36"></a><span class='hs-comment'>{-# INLINE chr2 #-}</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="validate1"></a><span class='hs-definition'>validate1</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word16</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-39"></a><span class='hs-definition'>validate1</span> <span class='hs-varid'>x1</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x1</span> <span class='hs-varop'><</span> <span class='hs-num'>0xD800</span> <span class='hs-varop'>||</span> <span class='hs-varid'>x1</span> <span class='hs-varop'>></span> <span class='hs-num'>0xDFFF</span>
<a name="line-40"></a><span class='hs-comment'>{-# INLINE validate1 #-}</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="validate2"></a><span class='hs-definition'>validate2</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Word16</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Word16</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-43"></a><span class='hs-definition'>validate2</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>x2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x1</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0xD800</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>x1</span> <span class='hs-varop'><=</span> <span class='hs-num'>0xDBFF</span> <span class='hs-varop'>&&</span>
<a name="line-44"></a> <span class='hs-varid'>x2</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0xDC00</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>x2</span> <span class='hs-varop'><=</span> <span class='hs-num'>0xDFFF</span>
<a name="line-45"></a><span class='hs-comment'>{-# INLINE validate2 #-}</span>
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