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diff --git a/doc/libunistring_11.html b/doc/libunistring_11.html index 1e95b7a..7fd2dc3 100644 --- a/doc/libunistring_11.html +++ b/doc/libunistring_11.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: 11. Word breaks in strings <uniwbrk.h></title> +<title>GNU libunistring: 11. Line breaking <unilbrk.h></title> -<meta name="description" content="GNU libunistring: 11. Word breaks in strings <uniwbrk.h>"> -<meta name="keywords" content="GNU libunistring: 11. Word breaks in strings <uniwbrk.h>"> +<meta name="description" content="GNU libunistring: 11. Line breaking <unilbrk.h>"> +<meta name="keywords" content="GNU libunistring: 11. Line breaking <unilbrk.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_10.html#SEC41" title="Beginning of this chapter or previous chapter"> << </a>]</td> -<td valign="middle" align="left">[<a href="libunistring_12.html#SEC47" title="Next chapter"> >> </a>]</td> +<tr><td valign="middle" align="left">[<a href="libunistring_10.html#SEC38" title="Beginning of this chapter or previous chapter"> << </a>]</td> +<td valign="middle" align="left">[<a href="libunistring_12.html#SEC42" title="Next chapter"> >> </a>]</td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> @@ -51,126 +51,134 @@ 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="uniwbrk_002eh"></a> -<a name="SEC44"></a> -<h1 class="chapter"> <a href="libunistring.html#TOC44">11. Word breaks in strings <code><uniwbrk.h></code></a> </h1> +<a name="unilbrk_002eh"></a> +<a name="SEC41"></a> +<h1 class="chapter"> <a href="libunistring.html#TOC41">11. Line breaking <code><unilbrk.h></code></a> </h1> <p>This include file declares functions for determining where in a string -“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. +line breaks could or should be introduced, in order to make the displayed +string fit into a column of given width. </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>These functions are locale dependent. The <var>encoding</var> argument identifies +the encoding (e.g. <code>"ISO-8859-2"</code> for Polish). +</p> +<p>The following enumerated values indicate whether, at a given position, a line +break is possible or not. Given an string <var>s</var> as an array +<code><var>s</var>[0..<var>n</var>-1]</code> and a position <var>i</var>, the values have the +following meanings: </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><u>Constant:</u> int <b>UC_BREAK_MANDATORY</b> +<a name="IDX633"></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> +<dd><p>This value indicates that <code><var>s</var>[<var>i</var>]</code> is a line break character. +</p></dd></dl> + +<dl> +<dt><u>Constant:</u> int <b>UC_BREAK_POSSIBLE</b> +<a name="IDX634"></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> +<dd><p>This value indicates that a line break may be inserted between +<code><var>s</var>[<var>i</var>-1]</code> and <code><var>s</var>[<var>i</var>]</code>. +</p></dd></dl> + +<dl> +<dt><u>Constant:</u> int <b>UC_BREAK_HYPHENATION</b> +<a name="IDX635"></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> +<dd><p>This value indicates that a hyphen and a line break may be inserted between +<code><var>s</var>[<var>i</var>-1]</code> and <code><var>s</var>[<var>i</var>]</code>. But beware of language +dependent hyphenation rules. +</p></dd></dl> + +<dl> +<dt><u>Constant:</u> int <b>UC_BREAK_PROHIBITED</b> +<a name="IDX636"></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. +<dd><p>This value indicates that <code><var>s</var>[<var>i</var>-1]</code> and <code><var>s</var>[<var>i</var>]</code> +must not be separated. </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> +<dl> +<dt><u>Constant:</u> int <b>UC_BREAK_UNDEFINED</b> +<a name="IDX637"></a> +</dt> +<dd><p>This value is not used as a return value; rather, in the overriding argument of +the <code>u*_width_linebreaks</code> functions, it indicates the absence of an +override. +</p></dd></dl> -<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 word break property. More values -may be added in the future. +<p>The following functions determine the positions at which line breaks are +possible. </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><u>Function:</u> void <b>u8_possible_linebreaks</b><i> (const uint8_t *<var>s</var>, size_t <var>n</var>, const char *<var>encoding</var>, char *<var>p</var>)</i> +<a name="IDX638"></a> </dt> -<dt><u>Constant:</u> int <b>WBP_FORMAT</b> -<a name="IDX745"></a> +<dt><u>Function:</u> void <b>u16_possible_linebreaks</b><i> (const uint16_t *<var>s</var>, size_t <var>n</var>, const char *<var>encoding</var>, char *<var>p</var>)</i> +<a name="IDX639"></a> </dt> -<dt><u>Constant:</u> int <b>WBP_KATAKANA</b> -<a name="IDX746"></a> +<dt><u>Function:</u> void <b>u32_possible_linebreaks</b><i> (const uint32_t *<var>s</var>, size_t <var>n</var>, const char *<var>encoding</var>, char *<var>p</var>)</i> +<a name="IDX640"></a> </dt> -<dt><u>Constant:</u> int <b>WBP_ALETTER</b> -<a name="IDX747"></a> +<dt><u>Function:</u> void <b>ulc_possible_linebreaks</b><i> (const char *<var>s</var>, size_t <var>n</var>, const char *<var>encoding</var>, char *<var>p</var>)</i> +<a name="IDX641"></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> +<dd><p>Determines the line break points in <var>s</var>, and stores the result at +<code><var>p</var>[0..<var>n</var>-1]</code>. Every <code><var>p</var>[<var>i</var>]</code> is assigned one of +the values <code>UC_BREAK_MANDATORY</code>, <code>UC_BREAK_POSSIBLE</code>, +<code>UC_BREAK_HYPHENATION</code>, <code>UC_BREAK_PROHIBITED</code>. +</p></dd></dl> + +<p>The following functions determine where line breaks should be inserted so that +each line fits in a given width, when output to a device that uses +non-proportional fonts. +</p> +<dl> +<dt><u>Function:</u> int <b>u8_width_linebreaks</b><i> (const uint8_t *<var>s</var>, size_t <var>n</var>, int <var>width</var>, int <var>start_column</var>, int <var>at_end_columns</var>, const char *<var>override</var>, const char *<var>encoding</var>, char *<var>p</var>)</i> +<a name="IDX642"></a> </dt> -<dt><u>Constant:</u> int <b>WBP_MIDNUM</b> -<a name="IDX750"></a> +<dt><u>Function:</u> int <b>u16_width_linebreaks</b><i> (const uint16_t *<var>s</var>, size_t <var>n</var>, int <var>width</var>, int <var>start_column</var>, int <var>at_end_columns</var>, const char *<var>override</var>, const char *<var>encoding</var>, char *<var>p</var>)</i> +<a name="IDX643"></a> </dt> -<dt><u>Constant:</u> int <b>WBP_NUMERIC</b> -<a name="IDX751"></a> +<dt><u>Function:</u> int <b>u32_width_linebreaks</b><i> (const uint32_t *<var>s</var>, size_t <var>n</var>, int <var>width</var>, int <var>start_column</var>, int <var>at_end_columns</var>, const char *<var>override</var>, const char *<var>encoding</var>, char *<var>p</var>)</i> +<a name="IDX644"></a> </dt> -<dt><u>Constant:</u> int <b>WBP_EXTENDNUMLET</b> -<a name="IDX752"></a> +<dt><u>Function:</u> int <b>ulc_width_linebreaks</b><i> (const char *<var>s</var>, size_t <var>n</var>, int <var>width</var>, int <var>start_column</var>, int <var>at_end_columns</var>, const char *<var>override</var>, const char *<var>encoding</var>, char *<var>p</var>)</i> +<a name="IDX645"></a> </dt> -</dl> - -<p>The following function looks up the word break property of a character. +<dd><p>Chooses the best line breaks, assuming that every character occupies a width +given by the <code>uc_width</code> function (see <a href="libunistring_9.html#SEC37">Display width <code><uniwidth.h></code></a>). </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>The string is <code><var>s</var>[0..<var>n</var>-1]</code>. +</p> +<p>The maximum number of columns per line is given as <var>width</var>. +The starting column of the string is given as <var>start_column</var>. +If the algorithm shall keep room after the last piece, this amount of room can +be given as <var>at_end_columns</var>. +</p> +<p><var>override</var> is an optional override; if +<code><var>override</var>[<var>i</var>] != UC_BREAK_UNDEFINED</code>, +<code><var>override</var>[<var>i</var>]</code> takes precedence over <code><var>p</var>[<var>i</var>]</code> +as returned by the <code>u*_possible_linebreaks</code> function. +</p> +<p>The given <var>encoding</var> is used for disambiguating widths in <code>uc_width</code>. +</p> +<p>Returns the column after the end of the string, and stores the result at +<code><var>p</var>[0..<var>n</var>-1]</code>. Every <code><var>p</var>[<var>i</var>]</code> is assigned one of +the values <code>UC_BREAK_MANDATORY</code>, <code>UC_BREAK_POSSIBLE</code>, +<code>UC_BREAK_HYPHENATION</code>, <code>UC_BREAK_PROHIBITED</code>. Here the value +<code>UC_BREAK_POSSIBLE</code> indicates that a line break <em>should</em> be inserted. </p></dd></dl> <hr size="6"> <table cellpadding="1" cellspacing="1" border="0"> -<tr><td valign="middle" align="left">[<a href="#SEC44" title="Beginning of this chapter or previous chapter"> << </a>]</td> -<td valign="middle" align="left">[<a href="libunistring_12.html#SEC47" title="Next chapter"> >> </a>]</td> +<tr><td valign="middle" align="left">[<a href="libunistring_10.html#SEC38" title="Beginning of this chapter or previous chapter"> << </a>]</td> +<td valign="middle" align="left">[<a href="libunistring_12.html#SEC42" title="Next chapter"> >> </a>]</td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> @@ -178,12 +186,12 @@ may be added in the future. <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> |