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<title>GNU libunistring: 11. Word breaks in strings &lt;uniwbrk.h&gt;</title>

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<a name="uniwbrk_002eh"></a>
<a name="SEC44"></a>
<h1 class="chapter"> <a href="libunistring.html#TOC44">11. 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="SEC45"></a>
<h2 class="section"> <a href="libunistring.html#TOC45">11.1 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="IDX736"></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="IDX737"></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="IDX738"></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="IDX739"></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="SEC46"></a>
<h2 class="section"> <a href="libunistring.html#TOC46">11.2 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="IDX740"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_CR</b>
<a name="IDX741"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_LF</b>
<a name="IDX742"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_NEWLINE</b>
<a name="IDX743"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_EXTEND</b>
<a name="IDX744"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_FORMAT</b>
<a name="IDX745"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_KATAKANA</b>
<a name="IDX746"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_ALETTER</b>
<a name="IDX747"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_MIDNUMLET</b>
<a name="IDX748"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_MIDLETTER</b>
<a name="IDX749"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_MIDNUM</b>
<a name="IDX750"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_NUMERIC</b>
<a name="IDX751"></a>
</dt>
<dt><u>Constant:</u> int <b>WBP_EXTENDNUMLET</b>
<a name="IDX752"></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="IDX753"></a>
</dt>
<dd><p>Returns the Word_Break property of a Unicode character.
</p></dd></dl>
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