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| author | Manuel A. Fernandez Montecelo <manuel.montezelo@gmail.com> | 2016-05-27 14:35:16 +0100 |
|---|---|---|
| committer | Manuel A. Fernandez Montecelo <manuel.montezelo@gmail.com> | 2016-05-27 14:35:16 +0100 |
| commit | 3590c846d4c2febbc05b4ad6b14a06edc549e453 (patch) | |
| tree | e5d38581c2f36e1cca02efedd2d85044d77f76f9 /doc/libunistring_12.html | |
| parent | a9a31b1de5776a3b08a82101a4fa711294f0dd1d (diff) | |
Imported Upstream version 0.9.6+really0.9.6upstream/0.9.6+really0.9.6
Diffstat (limited to 'doc/libunistring_12.html')
| -rw-r--r-- | doc/libunistring_12.html | 475 |
1 files changed, 84 insertions, 391 deletions
diff --git a/doc/libunistring_12.html b/doc/libunistring_12.html index 1a4db370..f4bee9d3 100644 --- a/doc/libunistring_12.html +++ b/doc/libunistring_12.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 March, 30 2010 by texi2html 1.78a --> +<!-- Created on July, 8 2015 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: 12. Normalization forms (composition and decomposition) <uninorm.h></title> +<title>GNU libunistring: 12. Line breaking <unilbrk.h></title> -<meta name="description" content="GNU libunistring: 12. Normalization forms (composition and decomposition) <uninorm.h>"> -<meta name="keywords" content="GNU libunistring: 12. Normalization forms (composition and decomposition) <uninorm.h>"> +<meta name="description" content="GNU libunistring: 12. Line breaking <unilbrk.h>"> +<meta name="keywords" content="GNU libunistring: 12. Line breaking <unilbrk.h>"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="texi2html 1.78a"> @@ -42,7 +42,7 @@ 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_11.html#SEC41" title="Beginning of this chapter or previous chapter"> << </a>]</td> +<tr><td valign="middle" align="left">[<a href="libunistring_11.html#SEC44" title="Beginning of this chapter or previous chapter"> << </a>]</td> <td valign="middle" align="left">[<a href="libunistring_13.html#SEC48" title="Next chapter"> >> </a>]</td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> @@ -51,440 +51,133 @@ 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_18.html#SEC71" title="Index">Index</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_abt.html#SEC_About" title="About (help)"> ? </a>]</td> </tr></table> <hr size="2"> -<a name="uninorm_002eh"></a> -<a name="SEC42"></a> -<h1 class="chapter"> <a href="libunistring.html#TOC42">12. Normalization forms (composition and decomposition) <code><uninorm.h></code></a> </h1> - -<p>This include file defines functions for transforming Unicode strings to one -of the four normal forms, known as NFC, NFD, NKFC, NFKD. These -transformations involve decomposition and — for NFC and NFKC — composition -of Unicode characters. -</p> - -<hr size="6"> -<a name="Decomposition-of-characters"></a> -<a name="SEC43"></a> -<h2 class="section"> <a href="libunistring.html#TOC43">12.1 Decomposition of Unicode characters</a> </h2> - -<p>The following enumerated values are the possible types of decomposition of a -Unicode character. -</p> -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_CANONICAL</b> -<a name="IDX646"></a> -</dt> -<dd><p>Denotes canonical decomposition. -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_FONT</b> -<a name="IDX647"></a> -</dt> -<dd><p>UCD marker: <code><font></code>. Denotes a font variant (e.g. a blackletter form). -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_NOBREAK</b> -<a name="IDX648"></a> -</dt> -<dd><p>UCD marker: <code><noBreak></code>. -Denotes a no-break version of a space or hyphen. -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_INITIAL</b> -<a name="IDX649"></a> -</dt> -<dd><p>UCD marker: <code><initial></code>. -Denotes an initial presentation form (Arabic). -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_MEDIAL</b> -<a name="IDX650"></a> -</dt> -<dd><p>UCD marker: <code><medial></code>. -Denotes a medial presentation form (Arabic). -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_FINAL</b> -<a name="IDX651"></a> -</dt> -<dd><p>UCD marker: <code><final></code>. -Denotes a final presentation form (Arabic). -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_ISOLATED</b> -<a name="IDX652"></a> -</dt> -<dd><p>UCD marker: <code><isolated></code>. -Denotes an isolated presentation form (Arabic). -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_CIRCLE</b> -<a name="IDX653"></a> -</dt> -<dd><p>UCD marker: <code><circle></code>. -Denotes an encircled form. -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_SUPER</b> -<a name="IDX654"></a> -</dt> -<dd><p>UCD marker: <code><super></code>. -Denotes a superscript form. -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_SUB</b> -<a name="IDX655"></a> -</dt> -<dd><p>UCD marker: <code><sub></code>. -Denotes a subscript form. -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_VERTICAL</b> -<a name="IDX656"></a> -</dt> -<dd><p>UCD marker: <code><vertical></code>. -Denotes a vertical layout presentation form. -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_WIDE</b> -<a name="IDX657"></a> -</dt> -<dd><p>UCD marker: <code><wide></code>. -Denotes a wide (or zenkaku) compatibility character. -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_NARROW</b> -<a name="IDX658"></a> -</dt> -<dd><p>UCD marker: <code><narrow></code>. -Denotes a narrow (or hankaku) compatibility character. -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_SMALL</b> -<a name="IDX659"></a> -</dt> -<dd><p>UCD marker: <code><small></code>. -Denotes a small variant form (CNS compatibility). -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_SQUARE</b> -<a name="IDX660"></a> -</dt> -<dd><p>UCD marker: <code><square></code>. -Denotes a CJK squared font variant. -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_FRACTION</b> -<a name="IDX661"></a> -</dt> -<dd><p>UCD marker: <code><fraction></code>. -Denotes a vulgar fraction form. -</p></dd></dl> - -<dl> -<dt><u>Constant:</u> int <b>UC_DECOMP_COMPAT</b> -<a name="IDX662"></a> -</dt> -<dd><p>UCD marker: <code><compat></code>. -Denotes an otherwise unspecified compatibility character. -</p></dd></dl> - -<p>The following constant denotes the maximum size of decomposition of a single -Unicode character. -</p> -<dl> -<dt><u>Macro:</u> unsigned int <b>UC_DECOMPOSITION_MAX_LENGTH</b> -<a name="IDX663"></a> -</dt> -<dd><p>This macro expands to a constant that is the required size of buffer passed to -the <code>uc_decomposition</code> and <code>uc_canonical_decomposition</code> functions. -</p></dd></dl> +<a name="unilbrk_002eh"></a> +<a name="SEC47"></a> +<h1 class="chapter"> <a href="libunistring.html#TOC47">12. Line breaking <code><unilbrk.h></code></a> </h1> -<p>The following functions decompose a Unicode character. -</p> -<dl> -<dt><u>Function:</u> int <b>uc_decomposition</b><i> (ucs4_t <var>uc</var>, int *<var>decomp_tag</var>, ucs4_t *<var>decomposition</var>)</i> -<a name="IDX664"></a> -</dt> -<dd><p>Returns the character decomposition mapping of the Unicode character <var>uc</var>. -<var>decomposition</var> must point to an array of at least -<code>UC_DECOMPOSITION_MAX_LENGTH</code> <code>ucs_t</code> elements. +<p>This include file declares functions for determining where in a string +line breaks could or should be introduced, in order to make the displayed +string fit into a column of given width. </p> -<p>When a decomposition exists, <code><var>decomposition</var>[0..<var>n</var>-1]</code> and -<code>*<var>decomp_tag</var></code> are filled and <var>n</var> is returned. Otherwise -1 is -returned. -</p></dd></dl> - -<dl> -<dt><u>Function:</u> int <b>uc_canonical_decomposition</b><i> (ucs4_t <var>uc</var>, ucs4_t *<var>decomposition</var>)</i> -<a name="IDX665"></a> -</dt> -<dd><p>Returns the canonical character decomposition mapping of the Unicode character -<var>uc</var>. <var>decomposition</var> must point to an array of at least -<code>UC_DECOMPOSITION_MAX_LENGTH</code> <code>ucs_t</code> elements. +<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>When a decomposition exists, <code><var>decomposition</var>[0..<var>n</var>-1]</code> is filled -and <var>n</var> is returned. Otherwise -1 is returned. -</p></dd></dl> - -<hr size="6"> -<a name="Composition-of-characters"></a> -<a name="SEC44"></a> -<h2 class="section"> <a href="libunistring.html#TOC44">12.2 Composition of Unicode characters</a> </h2> - -<p>The following function composes a Unicode character from two Unicode -characters. +<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> ucs4_t <b>uc_composition</b><i> (ucs4_t <var>uc1</var>, ucs4_t <var>uc2</var>)</i> -<a name="IDX666"></a> +<dt><u>Constant:</u> int <b>UC_BREAK_MANDATORY</b> +<a name="IDX754"></a> </dt> -<dd><p>Attempts to combine the Unicode characters <var>uc1</var>, <var>uc2</var>. -<var>uc1</var> is known to have canonical combining class 0. -</p> -<p>Returns the combination of <var>uc1</var> and <var>uc2</var>, if it exists. -Returns 0 otherwise. -</p> -<p>Not all decompositions can be recombined using this function. See the Unicode -file ‘<tt>CompositionExclusions.txt</tt>’ for details. +<dd><p>This value indicates that <code><var>s</var>[<var>i</var>]</code> is a line break character. </p></dd></dl> -<hr size="6"> -<a name="Normalization-of-strings"></a> -<a name="SEC45"></a> -<h2 class="section"> <a href="libunistring.html#TOC45">12.3 Normalization of strings</a> </h2> - -<p>The Unicode standard defines four normalization forms for Unicode strings. -The following type is used to denote a normalization form. -</p> <dl> -<dt><u>Type:</u> <b>uninorm_t</b> -<a name="IDX667"></a> +<dt><u>Constant:</u> int <b>UC_BREAK_POSSIBLE</b> +<a name="IDX755"></a> </dt> -<dd><p>An object of type <code>uninorm_t</code> denotes a Unicode normalization form. -This is a scalar type; its values can be compared with <code>==</code>. +<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> -<p>The following constants denote the four normalization forms. -</p> <dl> -<dt><u>Macro:</u> uninorm_t <b>UNINORM_NFD</b> -<a name="IDX668"></a> +<dt><u>Constant:</u> int <b>UC_BREAK_HYPHENATION</b> +<a name="IDX756"></a> </dt> -<dd><p>Denotes Normalization form D: canonical decomposition. +<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>Macro:</u> uninorm_t <b>UNINORM_NFC</b> -<a name="IDX669"></a> +<dt><u>Constant:</u> int <b>UC_BREAK_PROHIBITED</b> +<a name="IDX757"></a> </dt> -<dd><p>Normalization form C: canonical decomposition, then canonical composition. +<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> <dl> -<dt><u>Macro:</u> uninorm_t <b>UNINORM_NFKD</b> -<a name="IDX670"></a> +<dt><u>Constant:</u> int <b>UC_BREAK_UNDEFINED</b> +<a name="IDX758"></a> </dt> -<dd><p>Normalization form KD: compatibility decomposition. +<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> -<dl> -<dt><u>Macro:</u> uninorm_t <b>UNINORM_NFKC</b> -<a name="IDX671"></a> -</dt> -<dd><p>Normalization form KC: compatibility decomposition, then canonical composition. -</p></dd></dl> - -<p>The following functions operate on <code>uninorm_t</code> objects. +<p>The following functions determine the positions at which line breaks are +possible. </p> <dl> -<dt><u>Function:</u> bool <b>uninorm_is_compat_decomposing</b><i> (uninorm_t <var>nf</var>)</i> -<a name="IDX672"></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="IDX759"></a> </dt> -<dd><p>Tests whether the normalization form <var>nf</var> does compatibility decomposition. -</p></dd></dl> - -<dl> -<dt><u>Function:</u> bool <b>uninorm_is_composing</b><i> (uninorm_t <var>nf</var>)</i> -<a name="IDX673"></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="IDX760"></a> </dt> -<dd><p>Tests whether the normalization form <var>nf</var> includes canonical composition. -</p></dd></dl> - -<dl> -<dt><u>Function:</u> uninorm_t <b>uninorm_decomposing_form</b><i> (uninorm_t <var>nf</var>)</i> -<a name="IDX674"></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="IDX761"></a> </dt> -<dd><p>Returns the decomposing variant of the normalization form <var>nf</var>. -This maps NFC,NFD → NFD and NFKC,NFKD → NFKD. -</p></dd></dl> - -<p>The following functions apply a Unicode normalization form to a Unicode string. -</p> -<dl> -<dt><u>Function:</u> uint8_t * <b>u8_normalize</b><i> (uninorm_t <var>nf</var>, const uint8_t *<var>s</var>, size_t <var>n</var>, uint8_t *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> -<a name="IDX675"></a> -</dt> -<dt><u>Function:</u> uint16_t * <b>u16_normalize</b><i> (uninorm_t <var>nf</var>, const uint16_t *<var>s</var>, size_t <var>n</var>, uint16_t *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> -<a name="IDX676"></a> -</dt> -<dt><u>Function:</u> uint32_t * <b>u32_normalize</b><i> (uninorm_t <var>nf</var>, const uint32_t *<var>s</var>, size_t <var>n</var>, uint32_t *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> -<a name="IDX677"></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="IDX762"></a> </dt> -<dd><p>Returns the specified normalization form of a string. +<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> -<hr size="6"> -<a name="Normalizing-comparisons"></a> -<a name="SEC46"></a> -<h2 class="section"> <a href="libunistring.html#TOC46">12.4 Normalizing comparisons</a> </h2> - -<p>The following functions compare Unicode string, ignoring differences in -normalization. +<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_normcmp</b><i> (const uint8_t *<var>s1</var>, size_t <var>n1</var>, const uint8_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i> -<a name="IDX678"></a> +<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="IDX763"></a> </dt> -<dt><u>Function:</u> int <b>u16_normcmp</b><i> (const uint16_t *<var>s1</var>, size_t <var>n1</var>, const uint16_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i> -<a name="IDX679"></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="IDX764"></a> </dt> -<dt><u>Function:</u> int <b>u32_normcmp</b><i> (const uint32_t *<var>s1</var>, size_t <var>n1</var>, const uint32_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i> -<a name="IDX680"></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="IDX765"></a> </dt> -<dd><p>Compares <var>s1</var> and <var>s2</var>, ignoring differences in normalization. -</p> -<p><var>nf</var> must be either <code>UNINORM_NFD</code> or <code>UNINORM_NFKD</code>. -</p> -<p>If successful, sets <code>*<var>resultp</var></code> to -1 if <var>s1</var> < <var>s2</var>, -0 if <var>s1</var> = <var>s2</var>, 1 if <var>s1</var> > <var>s2</var>, and returns 0. -Upon failure, returns -1 with <code>errno</code> set. -</p></dd></dl> - -<a name="IDX681"></a> -<a name="IDX682"></a> -<dl> -<dt><u>Function:</u> char * <b>u8_normxfrm</b><i> (const uint8_t *<var>s</var>, size_t <var>n</var>, uninorm_t <var>nf</var>, char *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> -<a name="IDX683"></a> -</dt> -<dt><u>Function:</u> char * <b>u16_normxfrm</b><i> (const uint16_t *<var>s</var>, size_t <var>n</var>, uninorm_t <var>nf</var>, char *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> -<a name="IDX684"></a> -</dt> -<dt><u>Function:</u> char * <b>u32_normxfrm</b><i> (const uint32_t *<var>s</var>, size_t <var>n</var>, uninorm_t <var>nf</var>, char *<var>resultbuf</var>, size_t *<var>lengthp</var>)</i> -<a name="IDX685"></a> -</dt> -<dd><p>Converts the string <var>s</var> of length <var>n</var> to a NUL-terminated byte -sequence, in such a way that comparing <code>u8_normxfrm (<var>s1</var>)</code> and -<code>u8_normxfrm (<var>s2</var>)</code> with the <code>u8_cmp2</code> function is equivalent to -comparing <var>s1</var> and <var>s2</var> with the <code>u8_normcoll</code> function. -</p> -<p><var>nf</var> must be either <code>UNINORM_NFC</code> or <code>UNINORM_NFKC</code>. -</p></dd></dl> - -<dl> -<dt><u>Function:</u> int <b>u8_normcoll</b><i> (const uint8_t *<var>s1</var>, size_t <var>n1</var>, const uint8_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i> -<a name="IDX686"></a> -</dt> -<dt><u>Function:</u> int <b>u16_normcoll</b><i> (const uint16_t *<var>s1</var>, size_t <var>n1</var>, const uint16_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i> -<a name="IDX687"></a> -</dt> -<dt><u>Function:</u> int <b>u32_normcoll</b><i> (const uint32_t *<var>s1</var>, size_t <var>n1</var>, const uint32_t *<var>s2</var>, size_t <var>n2</var>, uninorm_t <var>nf</var>, int *<var>resultp</var>)</i> -<a name="IDX688"></a> -</dt> -<dd><p>Compares <var>s1</var> and <var>s2</var>, ignoring differences in normalization, using -the collation rules of the current locale. -</p> -<p><var>nf</var> must be either <code>UNINORM_NFC</code> or <code>UNINORM_NFKC</code>. -</p> -<p>If successful, sets <code>*<var>resultp</var></code> to -1 if <var>s1</var> < <var>s2</var>, -0 if <var>s1</var> = <var>s2</var>, 1 if <var>s1</var> > <var>s2</var>, and returns 0. -Upon failure, returns -1 with <code>errno</code> set. -</p></dd></dl> - -<hr size="6"> -<a name="Normalization-of-streams"></a> -<a name="SEC47"></a> -<h2 class="section"> <a href="libunistring.html#TOC47">12.5 Normalization of streams of Unicode characters</a> </h2> - -<p>A “stream of Unicode characters” is essentially a function that accepts an -<code>ucs4_t</code> argument repeatedly, optionally combined with a function that -“flushes” the stream. -</p> -<dl> -<dt><u>Type:</u> <b>struct uninorm_filter</b> -<a name="IDX689"></a> -</dt> -<dd><p>This is the data type of a stream of Unicode characters that normalizes its -input according to a given normalization form and passes the normalized -character sequence to the encapsulated stream of Unicode characters. -</p></dd></dl> - -<dl> -<dt><u>Function:</u> struct uninorm_filter * <b>uninorm_filter_create</b><i> (uninorm_t <var>nf</var>, int (*<var>stream_func</var>) (void *<var>stream_data</var>, ucs4_t <var>uc</var>), void *<var>stream_data</var>)</i> -<a name="IDX690"></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="IDX766"></a> </dt> -<dd><p>Creates and returns a normalization filter for Unicode characters. +<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#SEC40">Display width <code><uniwidth.h></code></a>). </p> -<p>The pair (<var>stream_func</var>, <var>stream_data</var>) is the encapsulated stream. -<code><var>stream_func</var> (<var>stream_data</var>, <var>uc</var>)</code> receives the Unicode -character <var>uc</var> and returns 0 if successful, or -1 with <code>errno</code> set -upon failure. +<p>The string is <code><var>s</var>[0..<var>n</var>-1]</code>. </p> -<p>Returns the new filter, or NULL with <code>errno</code> set upon failure. -</p></dd></dl> - -<dl> -<dt><u>Function:</u> int <b>uninorm_filter_write</b><i> (struct uninorm_filter *<var>filter</var>, ucs4_t <var>uc</var>)</i> -<a name="IDX691"></a> -</dt> -<dd><p>Stuffs a Unicode character into a normalizing filter. -Returns 0 if successful, or -1 with <code>errno</code> set upon failure. -</p></dd></dl> - -<dl> -<dt><u>Function:</u> int <b>uninorm_filter_flush</b><i> (struct uninorm_filter *<var>filter</var>)</i> -<a name="IDX692"></a> -</dt> -<dd><p>Brings data buffered in the filter to its destination, the encapsulated stream. +<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>Returns 0 if successful, or -1 with <code>errno</code> set upon failure. +<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>Note! If after calling this function, additional characters are written -into the filter, the resulting character sequence in the encapsulated stream -will not necessarily be normalized. -</p></dd></dl> - -<dl> -<dt><u>Function:</u> int <b>uninorm_filter_free</b><i> (struct uninorm_filter *<var>filter</var>)</i> -<a name="IDX693"></a> -</dt> -<dd><p>Brings data buffered in the filter to its destination, the encapsulated stream, -then closes and frees the filter. +<p>The given <var>encoding</var> is used for disambiguating widths in <code>uc_width</code>. </p> -<p>Returns 0 if successful, or -1 with <code>errno</code> set upon failure. +<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="#SEC42" title="Beginning of this chapter or previous chapter"> << </a>]</td> +<tr><td valign="middle" align="left">[<a href="libunistring_11.html#SEC44" title="Beginning of this chapter or previous chapter"> << </a>]</td> <td valign="middle" align="left">[<a href="libunistring_13.html#SEC48" title="Next chapter"> >> </a>]</td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> @@ -493,12 +186,12 @@ then closes and frees the filter. <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_18.html#SEC71" title="Index">Index</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_abt.html#SEC_About" title="About (help)"> ? </a>]</td> </tr></table> <p> <font size="-1"> - 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>. + 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>. </font> <br> |