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<?xml version="1.0" encoding="UTF-8"?>
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<title>Data/Text/ICU.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP, NoImplicitPrelude #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module      : Data.Text.ICU</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright   : (c) 2010 Bryan O'Sullivan</span>
<a name="line-5"></a><span class='hs-comment'>--</span>
<a name="line-6"></a><span class='hs-comment'>-- License     : BSD-style</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer  : bos@serpentine.com</span>
<a name="line-8"></a><span class='hs-comment'>-- Stability   : experimental</span>
<a name="line-9"></a><span class='hs-comment'>-- Portability : GHC</span>
<a name="line-10"></a><span class='hs-comment'>--</span>
<a name="line-11"></a><span class='hs-comment'>-- Commonly used functions for Unicode, implemented as bindings to the</span>
<a name="line-12"></a><span class='hs-comment'>-- International Components for Unicode (ICU) libraries.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- This module contains only the most commonly used types and</span>
<a name="line-15"></a><span class='hs-comment'>-- functions.  Other modules in this package expose richer interfaces.</span>
<a name="line-16"></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'>ICU</span>
<a name="line-17"></a>    <span class='hs-layout'>(</span>
<a name="line-18"></a>    <span class='hs-comment'>-- * Data representation</span>
<a name="line-19"></a>    <span class='hs-comment'>-- $data</span>
<a name="line-20"></a>
<a name="line-21"></a>    <span class='hs-comment'>-- * Types</span>
<a name="line-22"></a>      <span class='hs-conid'>LocaleName</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-23"></a>    <span class='hs-comment'>-- * Boundary analysis</span>
<a name="line-24"></a>    <span class='hs-comment'>-- $break</span>
<a name="line-25"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>Breaker</span>
<a name="line-26"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>Break</span>
<a name="line-27"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>brkPrefix</span>
<a name="line-28"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>brkBreak</span>
<a name="line-29"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>brkSuffix</span>
<a name="line-30"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>brkStatus</span>
<a name="line-31"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>Line</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-32"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>Word</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-33"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>breakCharacter</span>
<a name="line-34"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>breakLine</span>
<a name="line-35"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>breakSentence</span>
<a name="line-36"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>breakWord</span>
<a name="line-37"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>breaks</span>
<a name="line-38"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>breaksRight</span>
<a name="line-39"></a>    <span class='hs-comment'>-- * Case mapping</span>
<a name="line-40"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>toCaseFold</span>
<a name="line-41"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>toLower</span>
<a name="line-42"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>toUpper</span>
<a name="line-43"></a>    <span class='hs-comment'>-- * Iteration</span>
<a name="line-44"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>CharIterator</span>
<a name="line-45"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>fromString</span>
<a name="line-46"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>fromText</span>
<a name="line-47"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>fromUtf8</span>
<a name="line-48"></a>    <span class='hs-comment'>-- * Normalization</span>
<a name="line-49"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>NormalizationMode</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-50"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>normalize</span>
<a name="line-51"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>quickCheck</span>
<a name="line-52"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>isNormalized</span>
<a name="line-53"></a>    <span class='hs-comment'>-- * String comparison</span>
<a name="line-54"></a>    <span class='hs-comment'>-- ** Normalization-sensitive string comparison</span>
<a name="line-55"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>CompareOption</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-56"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>compare</span>
<a name="line-57"></a>    <span class='hs-comment'>-- ** Locale-sensitive string collation</span>
<a name="line-58"></a>    <span class='hs-comment'>-- $collate</span>
<a name="line-59"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>Collator</span>
<a name="line-60"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>collator</span>
<a name="line-61"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>collatorWith</span>
<a name="line-62"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>collate</span>
<a name="line-63"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>collateIter</span>
<a name="line-64"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>sortKey</span>
<a name="line-65"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>uca</span>
<a name="line-66"></a>    <span class='hs-comment'>-- * Regular expressions</span>
<a name="line-67"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>MatchOption</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-68"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>ParseError</span><span class='hs-layout'>(</span><span class='hs-varid'>errError</span><span class='hs-layout'>,</span> <span class='hs-varid'>errLine</span><span class='hs-layout'>,</span> <span class='hs-varid'>errOffset</span><span class='hs-layout'>)</span>
<a name="line-69"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>Match</span>
<a name="line-70"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>Regex</span>
<a name="line-71"></a>    <span class='hs-layout'>,</span> <span class='hs-conid'>Regular</span>
<a name="line-72"></a>    <span class='hs-comment'>-- ** Construction</span>
<a name="line-73"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>regex</span>
<a name="line-74"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>regex'</span>
<a name="line-75"></a>    <span class='hs-comment'>-- ** Inspection</span>
<a name="line-76"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>pattern</span>
<a name="line-77"></a>    <span class='hs-comment'>-- ** Searching</span>
<a name="line-78"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>find</span>
<a name="line-79"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>findAll</span>
<a name="line-80"></a>    <span class='hs-comment'>-- ** Match groups</span>
<a name="line-81"></a>    <span class='hs-comment'>-- $group</span>
<a name="line-82"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>groupCount</span>
<a name="line-83"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>unfold</span>
<a name="line-84"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>span</span>
<a name="line-85"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>group</span>
<a name="line-86"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>prefix</span>
<a name="line-87"></a>    <span class='hs-layout'>,</span> <span class='hs-varid'>suffix</span>
<a name="line-88"></a>    <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-89"></a>
<a name="line-90"></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'>ICU</span><span class='hs-varop'>.</span><span class='hs-conid'>Break</span><span class='hs-varop'>.</span><span class='hs-conid'>Pure</span>
<a name="line-91"></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'>ICU</span><span class='hs-varop'>.</span><span class='hs-conid'>Collate</span><span class='hs-varop'>.</span><span class='hs-conid'>Pure</span>
<a name="line-92"></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'>ICU</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span>
<a name="line-93"></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'>ICU</span><span class='hs-varop'>.</span><span class='hs-conid'>Iterator</span>
<a name="line-94"></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'>ICU</span><span class='hs-varop'>.</span><span class='hs-conid'>Normalize</span>
<a name="line-95"></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'>ICU</span><span class='hs-varop'>.</span><span class='hs-conid'>Regex</span><span class='hs-varop'>.</span><span class='hs-conid'>Pure</span>
<a name="line-96"></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'>ICU</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span>
<a name="line-97"></a><span class='hs-cpp'>#if defined(__HADDOCK__)</span>
<a name="line-98"></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'>Foreign</span>
<a name="line-99"></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-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-100"></a><span class='hs-cpp'>#endif</span>
<a name="line-101"></a>
<a name="line-102"></a><span class='hs-comment'>-- $data</span>
<a name="line-103"></a><span class='hs-comment'>--</span>
<a name="line-104"></a><span class='hs-comment'>-- The Haskell 'Text' type is implemented as an array in the Haskell</span>
<a name="line-105"></a><span class='hs-comment'>-- heap.  This means that its location is not pinned; it may be copied</span>
<a name="line-106"></a><span class='hs-comment'>-- during a garbage collection pass.  ICU, on the other hand, works</span>
<a name="line-107"></a><span class='hs-comment'>-- with strings that are allocated in the normal system heap and have</span>
<a name="line-108"></a><span class='hs-comment'>-- a fixed address.</span>
<a name="line-109"></a><span class='hs-comment'>--</span>
<a name="line-110"></a><span class='hs-comment'>-- To accommodate this need, these bindings use the functions from</span>
<a name="line-111"></a><span class='hs-comment'>-- "Data.Text.Foreign" to copy data between the Haskell heap and the</span>
<a name="line-112"></a><span class='hs-comment'>-- system heap.  The copied strings are still managed automatically,</span>
<a name="line-113"></a><span class='hs-comment'>-- but the need to duplicate data does add some performance and memory</span>
<a name="line-114"></a><span class='hs-comment'>-- overhead.</span>
<a name="line-115"></a>
<a name="line-116"></a><span class='hs-comment'>-- $break</span>
<a name="line-117"></a><span class='hs-comment'>--</span>
<a name="line-118"></a><span class='hs-comment'>-- Text boundary analysis is the process of locating linguistic</span>
<a name="line-119"></a><span class='hs-comment'>-- boundaries while formatting and handling text. Examples of this</span>
<a name="line-120"></a><span class='hs-comment'>-- process include:</span>
<a name="line-121"></a><span class='hs-comment'>--</span>
<a name="line-122"></a><span class='hs-comment'>-- * Locating appropriate points to word-wrap text to fit within</span>
<a name="line-123"></a><span class='hs-comment'>--   specific margins while displaying or printing.</span>
<a name="line-124"></a><span class='hs-comment'>--</span>
<a name="line-125"></a><span class='hs-comment'>-- * Counting characters, words, sentences, or paragraphs.</span>
<a name="line-126"></a><span class='hs-comment'>--</span>
<a name="line-127"></a><span class='hs-comment'>-- * Making a list of the unique words in a document.</span>
<a name="line-128"></a><span class='hs-comment'>--</span>
<a name="line-129"></a><span class='hs-comment'>-- * Figuring out if a given range of text contains only whole words.</span>
<a name="line-130"></a><span class='hs-comment'>--</span>
<a name="line-131"></a><span class='hs-comment'>-- * Capitalizing the first letter of each word.</span>
<a name="line-132"></a><span class='hs-comment'>--</span>
<a name="line-133"></a><span class='hs-comment'>-- * Locating a particular unit of the text (For example, finding the</span>
<a name="line-134"></a><span class='hs-comment'>--   third word in the document).</span>
<a name="line-135"></a><span class='hs-comment'>--</span>
<a name="line-136"></a><span class='hs-comment'>-- The 'Breaker' type was designed to support these kinds of</span>
<a name="line-137"></a><span class='hs-comment'>-- tasks.</span>
<a name="line-138"></a><span class='hs-comment'>--</span>
<a name="line-139"></a><span class='hs-comment'>-- For the impure boundary analysis API (which is richer, but less</span>
<a name="line-140"></a><span class='hs-comment'>-- easy to use than the pure API), see the "Data.Text.ICU.Break"</span>
<a name="line-141"></a><span class='hs-comment'>-- module.  The impure API supports some uses that may be less</span>
<a name="line-142"></a><span class='hs-comment'>-- efficient via the pure API, including:</span>
<a name="line-143"></a><span class='hs-comment'>--</span>
<a name="line-144"></a><span class='hs-comment'>-- * Locating the beginning of a word that the user has selected.</span>
<a name="line-145"></a><span class='hs-comment'>--</span>
<a name="line-146"></a><span class='hs-comment'>-- * Determining how far to move the text cursor when the user hits an</span>
<a name="line-147"></a><span class='hs-comment'>--   arrow key (Some characters require more than one position in the</span>
<a name="line-148"></a><span class='hs-comment'>--   text store and some characters in the text store do not display</span>
<a name="line-149"></a><span class='hs-comment'>--   at all).</span>
<a name="line-150"></a>
<a name="line-151"></a><span class='hs-comment'>-- $collate</span>
<a name="line-152"></a><span class='hs-comment'>--</span>
<a name="line-153"></a><span class='hs-comment'>-- For the impure collation API (which is richer, but less easy to</span>
<a name="line-154"></a><span class='hs-comment'>-- use than the pure API), see the "Data.Text.ICU.Collate"</span>
<a name="line-155"></a><span class='hs-comment'>-- module.</span>
<a name="line-156"></a>
<a name="line-157"></a><span class='hs-comment'>-- $group</span>
<a name="line-158"></a><span class='hs-comment'>--</span>
<a name="line-159"></a><span class='hs-comment'>-- Capturing groups are numbered starting from zero.  Group zero is</span>
<a name="line-160"></a><span class='hs-comment'>-- always the entire matching text.  Groups greater than zero contain</span>
<a name="line-161"></a><span class='hs-comment'>-- the text matching each capturing group in a regular expression.</span>
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