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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP, DeriveDataTypeable #-}</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</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, rtomharper@googlemail.com,</span>
<a name="line-11"></a><span class='hs-comment'>-- duncan@haskell.org</span>
<a name="line-12"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-13"></a><span class='hs-comment'>-- Portability : GHC</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-- A module containing private 'Text' internals. This exposes the</span>
<a name="line-16"></a><span class='hs-comment'>-- 'Text' representation and low level construction functions.</span>
<a name="line-17"></a><span class='hs-comment'>-- Modules which extend the 'Text' system may need to use this module.</span>
<a name="line-18"></a><span class='hs-comment'>--</span>
<a name="line-19"></a><span class='hs-comment'>-- You should not use this module unless you are determined to monkey</span>
<a name="line-20"></a><span class='hs-comment'>-- with the internals, as the functions here do just about nothing to</span>
<a name="line-21"></a><span class='hs-comment'>-- preserve data invariants. You have been warned!</span>
<a name="line-22"></a>
<a name="line-23"></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>
<a name="line-24"></a> <span class='hs-layout'>(</span>
<a name="line-25"></a> <span class='hs-comment'>-- * Types</span>
<a name="line-26"></a> <span class='hs-conid'>Text</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-27"></a> <span class='hs-comment'>-- * Construction</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>text</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>textP</span>
<a name="line-30"></a> <span class='hs-comment'>-- * Safety</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>safe</span>
<a name="line-32"></a> <span class='hs-comment'>-- * Code that must be here for accessibility</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>empty</span>
<a name="line-34"></a> <span class='hs-comment'>-- * Utilities</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>firstf</span>
<a name="line-36"></a> <span class='hs-comment'>-- * Debugging</span>
<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>showText</span>
<a name="line-38"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-39"></a>
<a name="line-40"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-41"></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-42"></a><span class='hs-cpp'>#endif</span>
<a name="line-43"></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-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'>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-45"></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'>ord</span><span class='hs-layout'>)</span>
<a name="line-46"></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-47"></a>
<a name="line-48"></a><a name="Text"></a><span class='hs-comment'>-- | A space efficient, packed, unboxed Unicode text type.</span>
<a name="line-49"></a><a name="Text"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span>
<a name="line-50"></a> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span> <span class='hs-comment'>-- payload</span>
<a name="line-51"></a> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-comment'>-- offset</span>
<a name="line-52"></a> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-comment'>-- length</span>
<a name="line-53"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Typeable</span><span class='hs-layout'>)</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="text"></a><span class='hs-comment'>-- | Smart constructor.</span>
<a name="line-56"></a><span class='hs-definition'>text</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-57"></a><span class='hs-definition'>text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>=</span>
<a name="line-58"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-59"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>c</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-60"></a> <span class='hs-varid'>alen</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>length</span> <span class='hs-varid'>arr</span>
<a name="line-61"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span>
<a name="line-62"></a> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>off</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span>
<a name="line-63"></a> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>alen</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-varop'>||</span> <span class='hs-varid'>len</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-varop'>||</span> <span class='hs-varid'>off</span> <span class='hs-varop'><</span> <span class='hs-varid'>alen</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span>
<a name="line-64"></a> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-varop'>||</span> <span class='hs-varid'>c</span> <span class='hs-varop'><</span> <span class='hs-num'>0xDC00</span> <span class='hs-varop'>||</span> <span class='hs-varid'>c</span> <span class='hs-varop'>></span> <span class='hs-num'>0xDFFF</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-65"></a><span class='hs-cpp'>#endif</span>
<a name="line-66"></a> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span>
<a name="line-67"></a><span class='hs-comment'>{-# INLINE text #-}</span>
<a name="line-68"></a>
<a name="line-69"></a><a name="empty"></a><span class='hs-comment'>-- | /O(1)/ The empty 'Text'.</span>
<a name="line-70"></a><span class='hs-definition'>empty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span>
<a name="line-71"></a><span class='hs-definition'>empty</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span>
<a name="line-72"></a><span class='hs-comment'>{-# INLINE [1] empty #-}</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="textP"></a><span class='hs-comment'>-- | Construct a 'Text' without invisibly pinning its byte array in</span>
<a name="line-75"></a><span class='hs-comment'>-- memory if its length has dwindled to zero.</span>
<a name="line-76"></a><span class='hs-definition'>textP</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Text</span>
<a name="line-77"></a><span class='hs-definition'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>len</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-78"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-varid'>len</span>
<a name="line-79"></a><span class='hs-comment'>{-# INLINE textP #-}</span>
<a name="line-80"></a>
<a name="line-81"></a><a name="showText"></a><span class='hs-comment'>-- | A useful 'show'-like function for debugging purposes.</span>
<a name="line-82"></a><span class='hs-definition'>showText</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-83"></a><span class='hs-definition'>showText</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-84"></a> <span class='hs-str'>"Text "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>toList</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-varop'>++</span> <span class='hs-chr'>' '</span> <span class='hs-conop'>:</span>
<a name="line-85"></a> <span class='hs-varid'>show</span> <span class='hs-varid'>off</span> <span class='hs-varop'>++</span> <span class='hs-chr'>' '</span> <span class='hs-conop'>:</span> <span class='hs-varid'>show</span> <span class='hs-varid'>len</span>
<a name="line-86"></a>
<a name="line-87"></a><span class='hs-comment'>-- | Map a 'Char' to a 'Text'-safe value.</span>
<a name="line-88"></a><span class='hs-comment'>--</span>
<a name="line-89"></a><span class='hs-comment'>-- UTF-16 surrogate code points are not included in the set of Unicode</span>
<a name="line-90"></a><span class='hs-comment'>-- scalar values, but are unfortunately admitted as valid 'Char'</span>
<a name="line-91"></a><span class='hs-comment'>-- values by Haskell. They cannot be represented in a 'Text'. This</span>
<a name="line-92"></a><span class='hs-comment'>-- function remaps those code points to the Unicode replacement</span>
<a name="line-93"></a><span class='hs-comment'>-- character \"&#xfffd;\", and leaves other code points unchanged.</span>
<a name="line-94"></a><span class='hs-keyword'>safe</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-95"></a><span class='hs-keyword'>safe</span> <span class='hs-varid'>c</span>
<a name="line-96"></a> <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'>0x1ff800</span> <span class='hs-varop'>/=</span> <span class='hs-num'>0xd800</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span>
<a name="line-97"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-chr'>'\xfffd'</span>
<a name="line-98"></a><span class='hs-comment'>{-# INLINE safe #-}</span>
<a name="line-99"></a>
<a name="line-100"></a><a name="firstf"></a><span class='hs-comment'>-- | Apply a function to the first element of an optional pair.</span>
<a name="line-101"></a><span class='hs-definition'>firstf</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>c</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> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-102"></a><span class='hs-definition'>firstf</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</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><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</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-103"></a><span class='hs-definition'>firstf</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
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