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authorAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
committerAndreas Rottmann <a.rottmann@gmx.at>2009-09-14 12:32:44 +0200
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+<head>
+<title>GNU libunistring: 10. Word breaks in strings &lt;uniwbrk.h&gt;</title>
+
+<meta name="description" content="GNU libunistring: 10. Word breaks in strings &lt;uniwbrk.h&gt;">
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+<table cellpadding="1" cellspacing="1" border="0">
+<tr><td valign="middle" align="left">[<a href="libunistring_9.html#SEC37" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_11.html#SEC41" title="Next chapter"> &gt;&gt; </a>]</td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left">[<a href="libunistring.html#SEC_Top" title="Cover (top) of document">Top</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_18.html#SEC71" title="Index">Index</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
+</tr></table>
+
+<hr size="2">
+<a name="uniwbrk_002eh"></a>
+<a name="SEC38"></a>
+<h1 class="chapter"> <a href="libunistring.html#TOC38">10. Word breaks in strings <code>&lt;uniwbrk.h&gt;</code></a> </h1>
+
+<p>This include file declares functions for determining where in a string
+&ldquo;words&rdquo; start and end. Here &ldquo;words&rdquo; are not necessarily the same as
+entities that can be looked up in dictionaries, but rather groups of
+consecutive characters that should not be split by text processing
+operations.
+</p>
+
+<hr size="6">
+<a name="Word-breaks-in-a-string"></a>
+<a name="SEC39"></a>
+<h2 class="section"> <a href="libunistring.html#TOC39">10.1 Word breaks in a string</a> </h2>
+
+<p>The following functions determine the word breaks in a string.
+</p>
+<dl>
+<dt><u>Function:</u> void <b>u8_wordbreaks</b><i> (const uint8_t *<var>s</var>, size_t <var>n</var>, char *<var>p</var>)</i>
+<a name="IDX615"></a>
+</dt>
+<dt><u>Function:</u> void <b>u16_wordbreaks</b><i> (const uint16_t *<var>s</var>, size_t <var>n</var>, char *<var>p</var>)</i>
+<a name="IDX616"></a>
+</dt>
+<dt><u>Function:</u> void <b>u32_wordbreaks</b><i> (const uint32_t *<var>s</var>, size_t <var>n</var>, char *<var>p</var>)</i>
+<a name="IDX617"></a>
+</dt>
+<dt><u>Function:</u> void <b>ulc_wordbreaks</b><i> (const char *<var>s</var>, size_t <var>n</var>, char *<var>p</var>)</i>
+<a name="IDX618"></a>
+</dt>
+<dd><p>Determines the word break points in <var>s</var>, an array of <var>n</var> units, and
+stores the result at <code><var>p</var>[0..<var>n</var>-1]</code>.
+</p><dl compact="compact">
+<dt> <code><var>p</var>[i] = 1</code></dt>
+<dd><p>means that there is a word boundary between <code><var>s</var>[i-1]</code> and
+<code><var>s</var>[i]</code>.
+</p></dd>
+<dt> <code><var>p</var>[i] = 0</code></dt>
+<dd><p>means that <code><var>s</var>[i-1]</code> and <code><var>s</var>[i]</code> must not be separated.
+</p></dd>
+</dl>
+<p><code><var>p</var>[0]</code> is always set to 0. If an application wants to consider a
+word break to be present at the beginning of the string (before
+<code><var>s</var>[0]</code>) or at the end of the string (after
+<code><var>s</var>[0..<var>n</var>-1]</code>), it has to treat these cases explicitly.
+</p></dd></dl>
+
+<hr size="6">
+<a name="Word-break-property"></a>
+<a name="SEC40"></a>
+<h2 class="section"> <a href="libunistring.html#TOC40">10.2 Word break property</a> </h2>
+
+<p>This is a more low-level API. The word break property is a property defined
+in Unicode Standard Annex #29, section &ldquo;Word Boundaries&rdquo;, see
+<a href="http://www.unicode.org/reports/tr29/#Word_Boundaries">http://www.unicode.org/reports/tr29/#Word_Boundaries</a>. It is
+used for determining the word breaks in a string.
+</p>
+<p>The following are the possible values of the word break property. More values
+may be added in the future.
+</p>
+<dl>
+<dt><u>Constant:</u> int <b>WBP_OTHER</b>
+<a name="IDX619"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_CR</b>
+<a name="IDX620"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_LF</b>
+<a name="IDX621"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_NEWLINE</b>
+<a name="IDX622"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_EXTEND</b>
+<a name="IDX623"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_FORMAT</b>
+<a name="IDX624"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_KATAKANA</b>
+<a name="IDX625"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_ALETTER</b>
+<a name="IDX626"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_MIDNUMLET</b>
+<a name="IDX627"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_MIDLETTER</b>
+<a name="IDX628"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_MIDNUM</b>
+<a name="IDX629"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_NUMERIC</b>
+<a name="IDX630"></a>
+</dt>
+<dt><u>Constant:</u> int <b>WBP_EXTENDNUMLET</b>
+<a name="IDX631"></a>
+</dt>
+</dl>
+
+<p>The following function looks up the word break property of a character.
+</p>
+<dl>
+<dt><u>Function:</u> int <b>uc_wordbreak_property</b><i> (ucs4_t <var>uc</var>)</i>
+<a name="IDX632"></a>
+</dt>
+<dd><p>Returns the Word_Break property of a Unicode character.
+</p></dd></dl>
+<hr size="6">
+<table cellpadding="1" cellspacing="1" border="0">
+<tr><td valign="middle" align="left">[<a href="#SEC38" title="Beginning of this chapter or previous chapter"> &lt;&lt; </a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_11.html#SEC41" title="Next chapter"> &gt;&gt; </a>]</td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left"> &nbsp; </td>
+<td valign="middle" align="left">[<a href="libunistring.html#SEC_Top" title="Cover (top) of document">Top</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring.html#SEC_Contents" title="Table of contents">Contents</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_18.html#SEC71" title="Index">Index</a>]</td>
+<td valign="middle" align="left">[<a href="libunistring_abt.html#SEC_About" title="About (help)"> ? </a>]</td>
+</tr></table>
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