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| author | Manuel A. Fernandez Montecelo <manuel.montezelo@gmail.com> | 2016-05-27 14:28:30 +0100 |
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| committer | Manuel A. Fernandez Montecelo <manuel.montezelo@gmail.com> | 2016-05-27 14:28:30 +0100 |
| commit | a9a31b1de5776a3b08a82101a4fa711294f0dd1d (patch) | |
| tree | 159134a624e51509f40ed8823249f09a70d1dda3 /doc/libunistring_10.html | |
| parent | 5f2b09982312c98863eb9a8dfe2c608b81f58259 (diff) | |
Imported Upstream version 0.9.6+really0.9.3upstream/0.9.6+really0.9.3
Diffstat (limited to 'doc/libunistring_10.html')
| -rw-r--r-- | doc/libunistring_10.html | 228 |
1 files changed, 80 insertions, 148 deletions
diff --git a/doc/libunistring_10.html b/doc/libunistring_10.html index 3f4f5dac..617406d6 100644 --- a/doc/libunistring_10.html +++ b/doc/libunistring_10.html @@ -1,6 +1,6 @@ <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html401/loose.dtd"> <html> -<!-- Created on July, 8 2015 by texi2html 1.78a --> +<!-- Created on March, 30 2010 by texi2html 1.78a --> <!-- Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author) Karl Berry <karl@freefriends.org> @@ -11,10 +11,10 @@ Send bugs and suggestions to <texi2html-bug@nongnu.org> --> <head> -<title>GNU libunistring: 10. Grapheme cluster breaks in strings <unigbrk.h></title> +<title>GNU libunistring: 10. Word breaks in strings <uniwbrk.h></title> -<meta name="description" content="GNU libunistring: 10. Grapheme cluster breaks in strings <unigbrk.h>"> -<meta name="keywords" content="GNU libunistring: 10. Grapheme cluster breaks in strings <unigbrk.h>"> +<meta name="description" content="GNU libunistring: 10. Word breaks in strings <uniwbrk.h>"> +<meta name="keywords" content="GNU libunistring: 10. Word breaks in strings <uniwbrk.h>"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="texi2html 1.78a"> @@ -42,8 +42,8 @@ ul.toc {list-style: none} <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> <table cellpadding="1" cellspacing="1" border="0"> -<tr><td valign="middle" align="left">[<a href="libunistring_9.html#SEC40" title="Beginning of this chapter or previous chapter"> << </a>]</td> -<td valign="middle" align="left">[<a href="libunistring_11.html#SEC44" title="Next chapter"> >> </a>]</td> +<tr><td valign="middle" align="left">[<a href="libunistring_9.html#SEC37" title="Beginning of this chapter or previous chapter"> << </a>]</td> +<td valign="middle" align="left">[<a href="libunistring_11.html#SEC41" title="Next chapter"> >> </a>]</td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> @@ -51,194 +51,126 @@ ul.toc {list-style: none} <td valign="middle" align="left"> </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_19.html#SEC77" title="Index">Index</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="unigbrk_002eh"></a> -<a name="SEC41"></a> -<h1 class="chapter"> <a href="libunistring.html#TOC41">10. Grapheme cluster breaks in strings <code><unigbrk.h></code></a> </h1> +<a name="uniwbrk_002eh"></a> +<a name="SEC38"></a> +<h1 class="chapter"> <a href="libunistring.html#TOC38">10. Word breaks in strings <code><uniwbrk.h></code></a> </h1> <p>This include file declares functions for determining where in a string -“grapheme clusters” start and end. A “grapheme cluster” is an -approximation to a user-perceived character, which sometimes -corresponds to multiple Unicode characters. Editing operations such as -mouse selection, cursor movement, and backspacing often operate on -grapheme clusters as units, not on individual characters. -</p> -<p>Some grapheme clusters are built from a base character and a combining -character. The letter ‘<samp>é</samp>’, -for example, is most commonly represented in Unicode as a single -character U+00E8 <small>LATIN SMALL LETTER E WITH ACUTE</small>. It is, -however, equally valid to use the pair of characters U+0065 <small>LATIN -SMALL LETTER E</small> followed by U+0301 <small>COMBINING ACUTE ACCENT</small>. Since -the user would perceive this pair of characters as a single character, -they would be grouped into a single grapheme cluster. -</p> -<p>But there are also grapheme clusters that consist of several base characters. -For example, a Devanagari letter and a Devanagari vowel sign that follows it -may form a grapheme cluster. Similarly, some pairs of Thai characters and -Hangul syllables (formed by two or three Hangul characters) are grapheme -clusters. +“words” start and end. Here “words” 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="Grapheme-cluster-breaks-in-a-string"></a> -<a name="SEC42"></a> -<h2 class="section"> <a href="libunistring.html#TOC42">10.1 Grapheme cluster breaks in a string</a> </h2> - -<p>The following functions find a single boundary between grapheme -clusters in a string. -</p> -<dl> -<dt><u>Function:</u> void <b>u8_grapheme_next</b><i> (const uint8_t *<var>s</var>, const uint8_t *<var>end</var>)</i> -<a name="IDX712"></a> -</dt> -<dt><u>Function:</u> void <b>u16_grapheme_next</b><i> (const uint16_t *<var>s</var>, const uint16_t *<var>end</var>)</i> -<a name="IDX713"></a> -</dt> -<dt><u>Function:</u> void <b>u32_grapheme_next</b><i> (const uint32_t *<var>s</var>, const uint32_t *<var>end</var>)</i> -<a name="IDX714"></a> -</dt> -<dd><p>Returns the start of the next grapheme cluster following <var>s</var>, -or <var>end</var> if no grapheme cluster break is encountered before it. -Returns NULL if and only if <code><var>s</var> == <var>end</var></code>. -</p></dd></dl> - -<dl> -<dt><u>Function:</u> void <b>u8_grapheme_prev</b><i> (const uint8_t *<var>s</var>, const uint8_t *<var>start</var>)</i> -<a name="IDX715"></a> -</dt> -<dt><u>Function:</u> void <b>u16_grapheme_prev</b><i> (const uint16_t *<var>s</var>, const uint16_t *<var>start</var>)</i> -<a name="IDX716"></a> -</dt> -<dt><u>Function:</u> void <b>u32_grapheme_prev</b><i> (const uint32_t *<var>s</var>, const uint32_t *<var>start</var>)</i> -<a name="IDX717"></a> -</dt> -<dd><p>Returns the start of the grapheme cluster preceding <var>s</var>, or -<var>start</var> if no grapheme cluster break is encountered before it. -Returns NULL if and only if <code><var>s</var> == <var>start</var></code>. -</p></dd></dl> +<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 all of the grapheme cluster -boundaries in a string. +<p>The following functions determine the word breaks in a string. </p> <dl> -<dt><u>Function:</u> void <b>u8_grapheme_breaks</b><i> (const uint8_t *<var>s</var>, size_t <var>n</var>, char *<var>p</var>)</i> -<a name="IDX718"></a> +<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_grapheme_breaks</b><i> (const uint16_t *<var>s</var>, size_t <var>n</var>, char *<var>p</var>)</i> -<a name="IDX719"></a> +<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_grapheme_breaks</b><i> (const uint32_t *<var>s</var>, size_t <var>n</var>, char *<var>p</var>)</i> -<a name="IDX720"></a> +<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_grapheme_breaks</b><i> (const char *<var>s</var>, size_t <var>n</var>, char *<var>p</var>)</i> -<a name="IDX721"></a> +<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 grapheme cluster 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>. +<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 grapheme cluster boundary between -<code><var>s</var>[i-1]</code> and <code><var>s</var>[i]</code>. +<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> are part of the -same grapheme cluster. +<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 1, because there is always a -grapheme cluster break at start of text. +<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="Grapheme-cluster-break-property"></a> -<a name="SEC43"></a> -<h2 class="section"> <a href="libunistring.html#TOC43">10.2 Grapheme cluster break property</a> </h2> - -<p>This is a more low-level API. The grapheme cluster break property is a -property defined in Unicode Standard Annex #29, section “Grapheme Cluster -Boundaries”, see -<a href="http://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries">http://www.unicode.org/reports/tr29/#Grapheme_Cluster_Boundaries</a>. -It is used for determining the grapheme cluster breaks in a string. +<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 “Word Boundaries”, 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 grapheme cluster break -property. More values may be added in the future. +<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>GBP_OTHER</b> -<a name="IDX722"></a> +<dt><u>Constant:</u> int <b>WBP_OTHER</b> +<a name="IDX619"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_CR</b> -<a name="IDX723"></a> +<dt><u>Constant:</u> int <b>WBP_CR</b> +<a name="IDX620"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_LF</b> -<a name="IDX724"></a> +<dt><u>Constant:</u> int <b>WBP_LF</b> +<a name="IDX621"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_CONTROL</b> -<a name="IDX725"></a> +<dt><u>Constant:</u> int <b>WBP_NEWLINE</b> +<a name="IDX622"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_EXTEND</b> -<a name="IDX726"></a> +<dt><u>Constant:</u> int <b>WBP_EXTEND</b> +<a name="IDX623"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_PREPEND</b> -<a name="IDX727"></a> +<dt><u>Constant:</u> int <b>WBP_FORMAT</b> +<a name="IDX624"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_SPACINGMARK</b> -<a name="IDX728"></a> +<dt><u>Constant:</u> int <b>WBP_KATAKANA</b> +<a name="IDX625"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_L</b> -<a name="IDX729"></a> +<dt><u>Constant:</u> int <b>WBP_ALETTER</b> +<a name="IDX626"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_V</b> -<a name="IDX730"></a> +<dt><u>Constant:</u> int <b>WBP_MIDNUMLET</b> +<a name="IDX627"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_T</b> -<a name="IDX731"></a> +<dt><u>Constant:</u> int <b>WBP_MIDLETTER</b> +<a name="IDX628"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_LV</b> -<a name="IDX732"></a> +<dt><u>Constant:</u> int <b>WBP_MIDNUM</b> +<a name="IDX629"></a> </dt> -<dt><u>Constant:</u> int <b>GBP_LVT</b> -<a name="IDX733"></a> +<dt><u>Constant:</u> int <b>WBP_NUMERIC</b> +<a name="IDX630"></a> </dt> -</dl> - -<p>The following function looks up the grapheme cluster break property of a -character. -</p> -<dl> -<dt><u>Function:</u> int <b>uc_graphemeclusterbreak_property</b><i> (ucs4_t <var>uc</var>)</i> -<a name="IDX734"></a> +<dt><u>Constant:</u> int <b>WBP_EXTENDNUMLET</b> +<a name="IDX631"></a> </dt> -<dd><p>Returns the Grapheme_Cluster_Break property of a Unicode character. -</p></dd></dl> +</dl> -<p>The following function determines whether there is a grapheme cluster -break between two Unicode characters. It is the primitive upon which -the higher-level functions in the previous section are directly based. +<p>The following function looks up the word break property of a character. </p> <dl> -<dt><u>Function:</u> bool <b>uc_is_grapheme_break</b><i> (ucs4_t <var>a</var>, ucs4_t <var>b</var>)</i> -<a name="IDX735"></a> +<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 true if there is an grapheme cluster boundary between Unicode -characters <var>a</var> and <var>b</var>. -</p> -<p>There is always a grapheme cluster break at the start or end of text. -You can specify zero for <var>a</var> or <var>b</var> to indicate start of text or end -of text, respectively. -</p> -<p>This implements the extended (not legacy) grapheme cluster rules -described in the Unicode standard, because the standard says that they -are preferred. +<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="#SEC41" title="Beginning of this chapter or previous chapter"> << </a>]</td> -<td valign="middle" align="left">[<a href="libunistring_11.html#SEC44" title="Next chapter"> >> </a>]</td> +<tr><td valign="middle" align="left">[<a href="#SEC38" title="Beginning of this chapter or previous chapter"> << </a>]</td> +<td valign="middle" align="left">[<a href="libunistring_11.html#SEC41" title="Next chapter"> >> </a>]</td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> @@ -246,12 +178,12 @@ are preferred. <td valign="middle" align="left"> </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_19.html#SEC77" title="Index">Index</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> <p> <font size="-1"> - This document was generated by <em>Daiki Ueno</em> on <em>July, 8 2015</em> using <a href="http://www.nongnu.org/texi2html/"><em>texi2html 1.78a</em></a>. + This document was generated by <em>Bruno Haible</em> on <em>March, 30 2010</em> using <a href="http://www.nongnu.org/texi2html/"><em>texi2html 1.78a</em></a>. </font> <br> |