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glib/glib/guniprop.c
Behdad Esfahbod 2152bd091e Improve g_unichar_iswide_cjk() docs. 
2008-12-12  Behdad Esfahbod  <behdad@gnome.org>

        * glib/guniprop.c: Improve g_unichar_iswide_cjk() docs.


svn path=/trunk/; revision=7741
2008-12-12 08:26:00 +00:00

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/* guniprop.c - Unicode character properties.
*
* Copyright (C) 1999 Tom Tromey
* Copyright (C) 2000 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <locale.h>
#include "glib.h"
#include "gunichartables.h"
#include "gmirroringtable.h"
#include "gscripttable.h"
#include "gunicodeprivate.h"
#include "galias.h"
#define ATTR_TABLE(Page) (((Page) <= G_UNICODE_LAST_PAGE_PART1) \
? attr_table_part1[Page] \
: attr_table_part2[(Page) - 0xe00])
#define ATTTABLE(Page, Char) \
((ATTR_TABLE(Page) == G_UNICODE_MAX_TABLE_INDEX) ? 0 : (attr_data[ATTR_TABLE(Page)][Char]))
#define TTYPE_PART1(Page, Char) \
((type_table_part1[Page] >= G_UNICODE_MAX_TABLE_INDEX) \
? (type_table_part1[Page] - G_UNICODE_MAX_TABLE_INDEX) \
: (type_data[type_table_part1[Page]][Char]))
#define TTYPE_PART2(Page, Char) \
((type_table_part2[Page] >= G_UNICODE_MAX_TABLE_INDEX) \
? (type_table_part2[Page] - G_UNICODE_MAX_TABLE_INDEX) \
: (type_data[type_table_part2[Page]][Char]))
#define TYPE(Char) \
(((Char) <= G_UNICODE_LAST_CHAR_PART1) \
? TTYPE_PART1 ((Char) >> 8, (Char) & 0xff) \
: (((Char) >= 0xe0000 && (Char) <= G_UNICODE_LAST_CHAR) \
? TTYPE_PART2 (((Char) - 0xe0000) >> 8, (Char) & 0xff) \
: G_UNICODE_UNASSIGNED))
#define IS(Type, Class) (((guint)1 << (Type)) & (Class))
#define OR(Type, Rest) (((guint)1 << (Type)) | (Rest))
#define ISALPHA(Type) IS ((Type), \
OR (G_UNICODE_LOWERCASE_LETTER, \
OR (G_UNICODE_UPPERCASE_LETTER, \
OR (G_UNICODE_TITLECASE_LETTER, \
OR (G_UNICODE_MODIFIER_LETTER, \
OR (G_UNICODE_OTHER_LETTER, 0))))))
#define ISALDIGIT(Type) IS ((Type), \
OR (G_UNICODE_DECIMAL_NUMBER, \
OR (G_UNICODE_LETTER_NUMBER, \
OR (G_UNICODE_OTHER_NUMBER, \
OR (G_UNICODE_LOWERCASE_LETTER, \
OR (G_UNICODE_UPPERCASE_LETTER, \
OR (G_UNICODE_TITLECASE_LETTER, \
OR (G_UNICODE_MODIFIER_LETTER, \
OR (G_UNICODE_OTHER_LETTER, 0)))))))))
#define ISMARK(Type) IS ((Type), \
OR (G_UNICODE_NON_SPACING_MARK, \
OR (G_UNICODE_COMBINING_MARK, \
OR (G_UNICODE_ENCLOSING_MARK, 0))))
#define ISZEROWIDTHTYPE(Type) IS ((Type), \
OR (G_UNICODE_NON_SPACING_MARK, \
OR (G_UNICODE_ENCLOSING_MARK, \
OR (G_UNICODE_FORMAT, 0))))
/**
* g_unichar_isalnum:
* @c: a Unicode character
*
* Determines whether a character is alphanumeric.
* Given some UTF-8 text, obtain a character value
* with g_utf8_get_char().
*
* Return value: %TRUE if @c is an alphanumeric character
**/
gboolean
g_unichar_isalnum (gunichar c)
{
return ISALDIGIT (TYPE (c)) ? TRUE : FALSE;
}
/**
* g_unichar_isalpha:
* @c: a Unicode character
*
* Determines whether a character is alphabetic (i.e. a letter).
* Given some UTF-8 text, obtain a character value with
* g_utf8_get_char().
*
* Return value: %TRUE if @c is an alphabetic character
**/
gboolean
g_unichar_isalpha (gunichar c)
{
return ISALPHA (TYPE (c)) ? TRUE : FALSE;
}
/**
* g_unichar_iscntrl:
* @c: a Unicode character
*
* Determines whether a character is a control character.
* Given some UTF-8 text, obtain a character value with
* g_utf8_get_char().
*
* Return value: %TRUE if @c is a control character
**/
gboolean
g_unichar_iscntrl (gunichar c)
{
return TYPE (c) == G_UNICODE_CONTROL;
}
/**
* g_unichar_isdigit:
* @c: a Unicode character
*
* Determines whether a character is numeric (i.e. a digit). This
* covers ASCII 0-9 and also digits in other languages/scripts. Given
* some UTF-8 text, obtain a character value with g_utf8_get_char().
*
* Return value: %TRUE if @c is a digit
**/
gboolean
g_unichar_isdigit (gunichar c)
{
return TYPE (c) == G_UNICODE_DECIMAL_NUMBER;
}
/**
* g_unichar_isgraph:
* @c: a Unicode character
*
* Determines whether a character is printable and not a space
* (returns %FALSE for control characters, format characters, and
* spaces). g_unichar_isprint() is similar, but returns %TRUE for
* spaces. Given some UTF-8 text, obtain a character value with
* g_utf8_get_char().
*
* Return value: %TRUE if @c is printable unless it's a space
**/
gboolean
g_unichar_isgraph (gunichar c)
{
return !IS (TYPE(c),
OR (G_UNICODE_CONTROL,
OR (G_UNICODE_FORMAT,
OR (G_UNICODE_UNASSIGNED,
OR (G_UNICODE_SURROGATE,
OR (G_UNICODE_SPACE_SEPARATOR,
0))))));
}
/**
* g_unichar_islower:
* @c: a Unicode character
*
* Determines whether a character is a lowercase letter.
* Given some UTF-8 text, obtain a character value with
* g_utf8_get_char().
*
* Return value: %TRUE if @c is a lowercase letter
**/
gboolean
g_unichar_islower (gunichar c)
{
return TYPE (c) == G_UNICODE_LOWERCASE_LETTER;
}
/**
* g_unichar_isprint:
* @c: a Unicode character
*
* Determines whether a character is printable.
* Unlike g_unichar_isgraph(), returns %TRUE for spaces.
* Given some UTF-8 text, obtain a character value with
* g_utf8_get_char().
*
* Return value: %TRUE if @c is printable
**/
gboolean
g_unichar_isprint (gunichar c)
{
return !IS (TYPE(c),
OR (G_UNICODE_CONTROL,
OR (G_UNICODE_FORMAT,
OR (G_UNICODE_UNASSIGNED,
OR (G_UNICODE_SURROGATE,
0)))));
}
/**
* g_unichar_ispunct:
* @c: a Unicode character
*
* Determines whether a character is punctuation or a symbol.
* Given some UTF-8 text, obtain a character value with
* g_utf8_get_char().
*
* Return value: %TRUE if @c is a punctuation or symbol character
**/
gboolean
g_unichar_ispunct (gunichar c)
{
return IS (TYPE(c),
OR (G_UNICODE_CONNECT_PUNCTUATION,
OR (G_UNICODE_DASH_PUNCTUATION,
OR (G_UNICODE_CLOSE_PUNCTUATION,
OR (G_UNICODE_FINAL_PUNCTUATION,
OR (G_UNICODE_INITIAL_PUNCTUATION,
OR (G_UNICODE_OTHER_PUNCTUATION,
OR (G_UNICODE_OPEN_PUNCTUATION,
OR (G_UNICODE_CURRENCY_SYMBOL,
OR (G_UNICODE_MODIFIER_SYMBOL,
OR (G_UNICODE_MATH_SYMBOL,
OR (G_UNICODE_OTHER_SYMBOL,
0)))))))))))) ? TRUE : FALSE;
}
/**
* g_unichar_isspace:
* @c: a Unicode character
*
* Determines whether a character is a space, tab, or line separator
* (newline, carriage return, etc.). Given some UTF-8 text, obtain a
* character value with g_utf8_get_char().
*
* (Note: don't use this to do word breaking; you have to use
* Pango or equivalent to get word breaking right, the algorithm
* is fairly complex.)
*
* Return value: %TRUE if @c is a space character
**/
gboolean
g_unichar_isspace (gunichar c)
{
switch (c)
{
/* special-case these since Unicode thinks they are not spaces */
case '\t':
case '\n':
case '\r':
case '\f':
return TRUE;
break;
default:
{
return IS (TYPE(c),
OR (G_UNICODE_SPACE_SEPARATOR,
OR (G_UNICODE_LINE_SEPARATOR,
OR (G_UNICODE_PARAGRAPH_SEPARATOR,
0)))) ? TRUE : FALSE;
}
break;
}
}
/**
* g_unichar_ismark:
* @c: a Unicode character
*
* Determines whether a character is a mark (non-spacing mark,
* combining mark, or enclosing mark in Unicode speak).
* Given some UTF-8 text, obtain a character value
* with g_utf8_get_char().
*
* Note: in most cases where isalpha characters are allowed,
* ismark characters should be allowed to as they are essential
* for writing most European languages as well as many non-Latin
* scripts.
*
* Return value: %TRUE if @c is a mark character
*
* Since: 2.14
**/
gboolean
g_unichar_ismark (gunichar c)
{
return ISMARK (TYPE (c));
}
/**
* g_unichar_isupper:
* @c: a Unicode character
*
* Determines if a character is uppercase.
*
* Return value: %TRUE if @c is an uppercase character
**/
gboolean
g_unichar_isupper (gunichar c)
{
return TYPE (c) == G_UNICODE_UPPERCASE_LETTER;
}
/**
* g_unichar_istitle:
* @c: a Unicode character
*
* Determines if a character is titlecase. Some characters in
* Unicode which are composites, such as the DZ digraph
* have three case variants instead of just two. The titlecase
* form is used at the beginning of a word where only the
* first letter is capitalized. The titlecase form of the DZ
* digraph is U+01F2 LATIN CAPITAL LETTTER D WITH SMALL LETTER Z.
*
* Return value: %TRUE if the character is titlecase
**/
gboolean
g_unichar_istitle (gunichar c)
{
unsigned int i;
for (i = 0; i < G_N_ELEMENTS (title_table); ++i)
if (title_table[i][0] == c)
return TRUE;
return FALSE;
}
/**
* g_unichar_isxdigit:
* @c: a Unicode character.
*
* Determines if a character is a hexidecimal digit.
*
* Return value: %TRUE if the character is a hexadecimal digit
**/
gboolean
g_unichar_isxdigit (gunichar c)
{
return ((c >= 'a' && c <= 'f')
|| (c >= 'A' && c <= 'F')
|| (TYPE (c) == G_UNICODE_DECIMAL_NUMBER));
}
/**
* g_unichar_isdefined:
* @c: a Unicode character
*
* Determines if a given character is assigned in the Unicode
* standard.
*
* Return value: %TRUE if the character has an assigned value
**/
gboolean
g_unichar_isdefined (gunichar c)
{
return !IS (TYPE(c),
OR (G_UNICODE_UNASSIGNED,
OR (G_UNICODE_SURROGATE,
0)));
}
/**
* g_unichar_iszerowidth:
* @c: a Unicode character
*
* Determines if a given character typically takes zero width when rendered.
* The return value is %TRUE for all non-spacing and enclosing marks
* (e.g., combining accents), format characters, zero-width
* space, but not U+00AD SOFT HYPHEN.
*
* A typical use of this function is with one of g_unichar_iswide() or
* g_unichar_iswide_cjk() to determine the number of cells a string occupies
* when displayed on a grid display (terminals). However, note that not all
* terminals support zero-width rendering of zero-width marks.
*
* Return value: %TRUE if the character has zero width
*
* Since: 2.14
**/
gboolean
g_unichar_iszerowidth (gunichar c)
{
if (G_UNLIKELY (c == 0x00AD))
return FALSE;
if (G_UNLIKELY (ISZEROWIDTHTYPE (TYPE (c))))
return TRUE;
if (G_UNLIKELY ((c >= 0x1160 && c < 0x1200) ||
c == 0x200B))
return TRUE;
return FALSE;
}
struct Interval
{
gunichar start, end;
};
static int
interval_compare (const void *key, const void *elt)
{
gunichar c = GPOINTER_TO_UINT (key);
struct Interval *interval = (struct Interval *)elt;
if (c < interval->start)
return -1;
if (c > interval->end)
return +1;
return 0;
}
/**
* g_unichar_iswide:
* @c: a Unicode character
*
* Determines if a character is typically rendered in a double-width
* cell.
*
* Return value: %TRUE if the character is wide
**/
gboolean
g_unichar_iswide (gunichar c)
{
/* sorted list of intervals of East_Asian_Width = W and F characters
* from Unicode 5.1.0. produced by mungling output of:
* grep ';[FW]\>' EastAsianWidth.txt */
static const struct Interval wide[] = {
{0x1100, 0x1159}, {0x115F, 0x115F}, {0x2329, 0x232A}, {0x2E80, 0x2E99},
{0x2E9B, 0x2EF3}, {0x2F00, 0x2FD5}, {0x2FF0, 0x2FFB}, {0x3000, 0x303E},
{0x3041, 0x3096}, {0x3099, 0x30FF}, {0x3105, 0x312D}, {0x3131, 0x318E},
{0x3190, 0x31B7}, {0x31C0, 0x31E3}, {0x31F0, 0x321E}, {0x3220, 0x3243},
{0x3250, 0x32FE}, {0x3300, 0x4DB5}, {0x4E00, 0x9FC3}, {0xA000, 0xA48C},
{0xA490, 0xA4C6}, {0xAC00, 0xD7A3}, {0xF900, 0xFA2D}, {0xFA30, 0xFA6A},
{0xFA70, 0xFAD9}, {0xFE10, 0xFE19}, {0xFE30, 0xFE52}, {0xFE54, 0xFE66},
{0xFE68, 0xFE6B}, {0xFF01, 0xFF60}, {0xFFE0, 0xFFE6}, {0x20000, 0x2FFFD},
{0x30000, 0x3FFFD}
};
if (bsearch (GUINT_TO_POINTER (c), wide, G_N_ELEMENTS (wide), sizeof wide[0],
interval_compare))
return TRUE;
return FALSE;
}
/**
* g_unichar_iswide_cjk:
* @c: a Unicode character
*
* Determines if a character is typically rendered in a double-width
* cell under legacy East Asian locales. If a character is wide according to
* g_unichar_iswide(), then it is also reported wide with this function, but
* the converse is not necessarily true. See the
* <ulink url="http://www.unicode.org/reports/tr11/">Unicode Standard
* Annex #11</ulink> for details.
*
* If a character passes the g_unichar_iswide() test then it will also pass
* this test, but not the other way around. Note that some characters may
* pas both this test and g_unichar_iszerowidth().
*
* Return value: %TRUE if the character is wide in legacy East Asian locales
*
* Since: 2.12
*/
gboolean
g_unichar_iswide_cjk (gunichar c)
{
/* sorted list of intervals of East_Asian_Width = A and F characters
* from Unicode 5.1.0. produced by mungling output of:
* grep ';[A]\>' EastAsianWidth.txt */
static const struct Interval ambiguous[] = {
{0x00A1, 0x00A1}, {0x00A4, 0x00A4}, {0x00A7, 0x00A8}, {0x00AA, 0x00AA},
{0x00AD, 0x00AE}, {0x00B0, 0x00B4}, {0x00B6, 0x00BA}, {0x00BC, 0x00BF},
{0x00C6, 0x00C6}, {0x00D0, 0x00D0}, {0x00D7, 0x00D8}, {0x00DE, 0x00E1},
{0x00E6, 0x00E6}, {0x00E8, 0x00EA}, {0x00EC, 0x00ED}, {0x00F0, 0x00F0},
{0x00F2, 0x00F3}, {0x00F7, 0x00FA}, {0x00FC, 0x00FC}, {0x00FE, 0x00FE},
{0x0101, 0x0101}, {0x0111, 0x0111}, {0x0113, 0x0113}, {0x011B, 0x011B},
{0x0126, 0x0127}, {0x012B, 0x012B}, {0x0131, 0x0133}, {0x0138, 0x0138},
{0x013F, 0x0142}, {0x0144, 0x0144}, {0x0148, 0x014B}, {0x014D, 0x014D},
{0x0152, 0x0153}, {0x0166, 0x0167}, {0x016B, 0x016B}, {0x01CE, 0x01CE},
{0x01D0, 0x01D0}, {0x01D2, 0x01D2}, {0x01D4, 0x01D4}, {0x01D6, 0x01D6},
{0x01D8, 0x01D8}, {0x01DA, 0x01DA}, {0x01DC, 0x01DC}, {0x0251, 0x0251},
{0x0261, 0x0261}, {0x02C4, 0x02C4}, {0x02C7, 0x02C7}, {0x02C9, 0x02CB},
{0x02CD, 0x02CD}, {0x02D0, 0x02D0}, {0x02D8, 0x02DB}, {0x02DD, 0x02DD},
{0x02DF, 0x02DF}, {0x0300, 0x036F}, {0x0391, 0x03A1}, {0x03A3, 0x03A9},
{0x03B1, 0x03C1}, {0x03C3, 0x03C9}, {0x0401, 0x0401}, {0x0410, 0x044F},
{0x0451, 0x0451}, {0x2010, 0x2010}, {0x2013, 0x2016}, {0x2018, 0x2019},
{0x201C, 0x201D}, {0x2020, 0x2022}, {0x2024, 0x2027}, {0x2030, 0x2030},
{0x2032, 0x2033}, {0x2035, 0x2035}, {0x203B, 0x203B}, {0x203E, 0x203E},
{0x2074, 0x2074}, {0x207F, 0x207F}, {0x2081, 0x2084}, {0x20AC, 0x20AC},
{0x2103, 0x2103}, {0x2105, 0x2105}, {0x2109, 0x2109}, {0x2113, 0x2113},
{0x2116, 0x2116}, {0x2121, 0x2122}, {0x2126, 0x2126}, {0x212B, 0x212B},
{0x2153, 0x2154}, {0x215B, 0x215E}, {0x2160, 0x216B}, {0x2170, 0x2179},
{0x2190, 0x2199}, {0x21B8, 0x21B9}, {0x21D2, 0x21D2}, {0x21D4, 0x21D4},
{0x21E7, 0x21E7}, {0x2200, 0x2200}, {0x2202, 0x2203}, {0x2207, 0x2208},
{0x220B, 0x220B}, {0x220F, 0x220F}, {0x2211, 0x2211}, {0x2215, 0x2215},
{0x221A, 0x221A}, {0x221D, 0x2220}, {0x2223, 0x2223}, {0x2225, 0x2225},
{0x2227, 0x222C}, {0x222E, 0x222E}, {0x2234, 0x2237}, {0x223C, 0x223D},
{0x2248, 0x2248}, {0x224C, 0x224C}, {0x2252, 0x2252}, {0x2260, 0x2261},
{0x2264, 0x2267}, {0x226A, 0x226B}, {0x226E, 0x226F}, {0x2282, 0x2283},
{0x2286, 0x2287}, {0x2295, 0x2295}, {0x2299, 0x2299}, {0x22A5, 0x22A5},
{0x22BF, 0x22BF}, {0x2312, 0x2312}, {0x2460, 0x24E9}, {0x24EB, 0x254B},
{0x2550, 0x2573}, {0x2580, 0x258F}, {0x2592, 0x2595}, {0x25A0, 0x25A1},
{0x25A3, 0x25A9}, {0x25B2, 0x25B3}, {0x25B6, 0x25B7}, {0x25BC, 0x25BD},
{0x25C0, 0x25C1}, {0x25C6, 0x25C8}, {0x25CB, 0x25CB}, {0x25CE, 0x25D1},
{0x25E2, 0x25E5}, {0x25EF, 0x25EF}, {0x2605, 0x2606}, {0x2609, 0x2609},
{0x260E, 0x260F}, {0x2614, 0x2615}, {0x261C, 0x261C}, {0x261E, 0x261E},
{0x2640, 0x2640}, {0x2642, 0x2642}, {0x2660, 0x2661}, {0x2663, 0x2665},
{0x2667, 0x266A}, {0x266C, 0x266D}, {0x266F, 0x266F}, {0x273D, 0x273D},
{0x2776, 0x277F}, {0xE000, 0xF8FF}, {0xFE00, 0xFE0F}, {0xFFFD, 0xFFFD},
{0xE0100, 0xE01EF}, {0xF0000, 0xFFFFD}, {0x100000, 0x10FFFD}
};
if (g_unichar_iswide (c))
return TRUE;
if (bsearch (GUINT_TO_POINTER (c), ambiguous, G_N_ELEMENTS (ambiguous), sizeof ambiguous[0],
interval_compare))
return TRUE;
return FALSE;
}
/**
* g_unichar_toupper:
* @c: a Unicode character
*
* Converts a character to uppercase.
*
* Return value: the result of converting @c to uppercase.
* If @c is not an lowercase or titlecase character,
* or has no upper case equivalent @c is returned unchanged.
**/
gunichar
g_unichar_toupper (gunichar c)
{
int t = TYPE (c);
if (t == G_UNICODE_LOWERCASE_LETTER)
{
gunichar val = ATTTABLE (c >> 8, c & 0xff);
if (val >= 0x1000000)
{
const gchar *p = special_case_table + val - 0x1000000;
val = g_utf8_get_char (p);
}
/* Some lowercase letters, e.g., U+000AA, FEMININE ORDINAL INDICATOR,
* do not have an uppercase equivalent, in which case val will be
* zero.
*/
return val ? val : c;
}
else if (t == G_UNICODE_TITLECASE_LETTER)
{
unsigned int i;
for (i = 0; i < G_N_ELEMENTS (title_table); ++i)
{
if (title_table[i][0] == c)
return title_table[i][1];
}
}
return c;
}
/**
* g_unichar_tolower:
* @c: a Unicode character.
*
* Converts a character to lower case.
*
* Return value: the result of converting @c to lower case.
* If @c is not an upperlower or titlecase character,
* or has no lowercase equivalent @c is returned unchanged.
**/
gunichar
g_unichar_tolower (gunichar c)
{
int t = TYPE (c);
if (t == G_UNICODE_UPPERCASE_LETTER)
{
gunichar val = ATTTABLE (c >> 8, c & 0xff);
if (val >= 0x1000000)
{
const gchar *p = special_case_table + val - 0x1000000;
return g_utf8_get_char (p);
}
else
{
/* Not all uppercase letters are guaranteed to have a lowercase
* equivalent. If this is the case, val will be zero. */
return val ? val : c;
}
}
else if (t == G_UNICODE_TITLECASE_LETTER)
{
unsigned int i;
for (i = 0; i < G_N_ELEMENTS (title_table); ++i)
{
if (title_table[i][0] == c)
return title_table[i][2];
}
}
return c;
}
/**
* g_unichar_totitle:
* @c: a Unicode character
*
* Converts a character to the titlecase.
*
* Return value: the result of converting @c to titlecase.
* If @c is not an uppercase or lowercase character,
* @c is returned unchanged.
**/
gunichar
g_unichar_totitle (gunichar c)
{
unsigned int i;
for (i = 0; i < G_N_ELEMENTS (title_table); ++i)
{
if (title_table[i][0] == c || title_table[i][1] == c
|| title_table[i][2] == c)
return title_table[i][0];
}
if (TYPE (c) == G_UNICODE_LOWERCASE_LETTER)
return g_unichar_toupper (c);
return c;
}
/**
* g_unichar_digit_value:
* @c: a Unicode character
*
* Determines the numeric value of a character as a decimal
* digit.
*
* Return value: If @c is a decimal digit (according to
* g_unichar_isdigit()), its numeric value. Otherwise, -1.
**/
int
g_unichar_digit_value (gunichar c)
{
if (TYPE (c) == G_UNICODE_DECIMAL_NUMBER)
return ATTTABLE (c >> 8, c & 0xff);
return -1;
}
/**
* g_unichar_xdigit_value:
* @c: a Unicode character
*
* Determines the numeric value of a character as a hexidecimal
* digit.
*
* Return value: If @c is a hex digit (according to
* g_unichar_isxdigit()), its numeric value. Otherwise, -1.
**/
int
g_unichar_xdigit_value (gunichar c)
{
if (c >= 'A' && c <= 'F')
return c - 'A' + 10;
if (c >= 'a' && c <= 'f')
return c - 'a' + 10;
if (TYPE (c) == G_UNICODE_DECIMAL_NUMBER)
return ATTTABLE (c >> 8, c & 0xff);
return -1;
}
/**
* g_unichar_type:
* @c: a Unicode character
*
* Classifies a Unicode character by type.
*
* Return value: the type of the character.
**/
GUnicodeType
g_unichar_type (gunichar c)
{
return TYPE (c);
}
/*
* Case mapping functions
*/
typedef enum {
LOCALE_NORMAL,
LOCALE_TURKIC,
LOCALE_LITHUANIAN
} LocaleType;
static LocaleType
get_locale_type (void)
{
#ifdef G_OS_WIN32
char *tem = g_win32_getlocale ();
char locale[2];
locale[0] = tem[0];
locale[1] = tem[1];
g_free (tem);
#else
const char *locale = setlocale (LC_CTYPE, NULL);
#endif
switch (locale[0])
{
case 'a':
if (locale[1] == 'z')
return LOCALE_TURKIC;
break;
case 'l':
if (locale[1] == 't')
return LOCALE_LITHUANIAN;
break;
case 't':
if (locale[1] == 'r')
return LOCALE_TURKIC;
break;
}
return LOCALE_NORMAL;
}
static gint
output_marks (const char **p_inout,
char *out_buffer,
gboolean remove_dot)
{
const char *p = *p_inout;
gint len = 0;
while (*p)
{
gunichar c = g_utf8_get_char (p);
if (ISMARK (TYPE (c)))
{
if (!remove_dot || c != 0x307 /* COMBINING DOT ABOVE */)
len += g_unichar_to_utf8 (c, out_buffer ? out_buffer + len : NULL);
p = g_utf8_next_char (p);
}
else
break;
}
*p_inout = p;
return len;
}
static gint
output_special_case (gchar *out_buffer,
int offset,
int type,
int which)
{
const gchar *p = special_case_table + offset;
gint len;
if (type != G_UNICODE_TITLECASE_LETTER)
p = g_utf8_next_char (p);
if (which == 1)
p += strlen (p) + 1;
len = strlen (p);
if (out_buffer)
memcpy (out_buffer, p, len);
return len;
}
static gsize
real_toupper (const gchar *str,
gssize max_len,
gchar *out_buffer,
LocaleType locale_type)
{
const gchar *p = str;
const char *last = NULL;
gsize len = 0;
gboolean last_was_i = FALSE;
while ((max_len < 0 || p < str + max_len) && *p)
{
gunichar c = g_utf8_get_char (p);
int t = TYPE (c);
gunichar val;
last = p;
p = g_utf8_next_char (p);
if (locale_type == LOCALE_LITHUANIAN)
{
if (c == 'i')
last_was_i = TRUE;
else
{
if (last_was_i)
{
/* Nasty, need to remove any dot above. Though
* I think only E WITH DOT ABOVE occurs in practice
* which could simplify this considerably.
*/
gsize decomp_len, i;
gunichar *decomp;
decomp = g_unicode_canonical_decomposition (c, &decomp_len);
for (i=0; i < decomp_len; i++)
{
if (decomp[i] != 0x307 /* COMBINING DOT ABOVE */)
len += g_unichar_to_utf8 (g_unichar_toupper (decomp[i]), out_buffer ? out_buffer + len : NULL);
}
g_free (decomp);
len += output_marks (&p, out_buffer ? out_buffer + len : NULL, TRUE);
continue;
}
if (!ISMARK (t))
last_was_i = FALSE;
}
}
if (locale_type == LOCALE_TURKIC && c == 'i')
{
/* i => LATIN CAPITAL LETTER I WITH DOT ABOVE */
len += g_unichar_to_utf8 (0x130, out_buffer ? out_buffer + len : NULL);
}
else if (c == 0x0345) /* COMBINING GREEK YPOGEGRAMMENI */
{
/* Nasty, need to move it after other combining marks .. this would go away if
* we normalized first.
*/
len += output_marks (&p, out_buffer ? out_buffer + len : NULL, FALSE);
/* And output as GREEK CAPITAL LETTER IOTA */
len += g_unichar_to_utf8 (0x399, out_buffer ? out_buffer + len : NULL);
}
else if (IS (t,
OR (G_UNICODE_LOWERCASE_LETTER,
OR (G_UNICODE_TITLECASE_LETTER,
0))))
{
val = ATTTABLE (c >> 8, c & 0xff);
if (val >= 0x1000000)
{
len += output_special_case (out_buffer ? out_buffer + len : NULL, val - 0x1000000, t,
t == G_UNICODE_LOWERCASE_LETTER ? 0 : 1);
}
else
{
if (t == G_UNICODE_TITLECASE_LETTER)
{
unsigned int i;
for (i = 0; i < G_N_ELEMENTS (title_table); ++i)
{
if (title_table[i][0] == c)
{
val = title_table[i][1];
break;
}
}
}
/* Some lowercase letters, e.g., U+000AA, FEMININE ORDINAL INDICATOR,
* do not have an uppercase equivalent, in which case val will be
* zero. */
len += g_unichar_to_utf8 (val ? val : c, out_buffer ? out_buffer + len : NULL);
}
}
else
{
gsize char_len = g_utf8_skip[*(guchar *)last];
if (out_buffer)
memcpy (out_buffer + len, last, char_len);
len += char_len;
}
}
return len;
}
/**
* g_utf8_strup:
* @str: a UTF-8 encoded string
* @len: length of @str, in bytes, or -1 if @str is nul-terminated.
*
* Converts all Unicode characters in the string that have a case
* to uppercase. The exact manner that this is done depends
* on the current locale, and may result in the number of
* characters in the string increasing. (For instance, the
* German ess-zet will be changed to SS.)
*
* Return value: a newly allocated string, with all characters
* converted to uppercase.
**/
gchar *
g_utf8_strup (const gchar *str,
gssize len)
{
gsize result_len;
LocaleType locale_type;
gchar *result;
g_return_val_if_fail (str != NULL, NULL);
locale_type = get_locale_type ();
/*
* We use a two pass approach to keep memory management simple
*/
result_len = real_toupper (str, len, NULL, locale_type);
result = g_malloc (result_len + 1);
real_toupper (str, len, result, locale_type);
result[result_len] = '\0';
return result;
}
/* traverses the string checking for characters with combining class == 230
* until a base character is found */
static gboolean
has_more_above (const gchar *str)
{
const gchar *p = str;
gint combining_class;
while (*p)
{
combining_class = g_unichar_combining_class (g_utf8_get_char (p));
if (combining_class == 230)
return TRUE;
else if (combining_class == 0)
break;
p = g_utf8_next_char (p);
}
return FALSE;
}
static gsize
real_tolower (const gchar *str,
gssize max_len,
gchar *out_buffer,
LocaleType locale_type)
{
const gchar *p = str;
const char *last = NULL;
gsize len = 0;
while ((max_len < 0 || p < str + max_len) && *p)
{
gunichar c = g_utf8_get_char (p);
int t = TYPE (c);
gunichar val;
last = p;
p = g_utf8_next_char (p);
if (locale_type == LOCALE_TURKIC && c == 'I')
{
if (g_utf8_get_char (p) == 0x0307)
{
/* I + COMBINING DOT ABOVE => i (U+0069) */
len += g_unichar_to_utf8 (0x0069, out_buffer ? out_buffer + len : NULL);
p = g_utf8_next_char (p);
}
else
{
/* I => LATIN SMALL LETTER DOTLESS I */
len += g_unichar_to_utf8 (0x131, out_buffer ? out_buffer + len : NULL);
}
}
/* Introduce an explicit dot above when lowercasing capital I's and J's
* whenever there are more accents above. [SpecialCasing.txt] */
else if (locale_type == LOCALE_LITHUANIAN &&
(c == 0x00cc || c == 0x00cd || c == 0x0128))
{
len += g_unichar_to_utf8 (0x0069, out_buffer ? out_buffer + len : NULL);
len += g_unichar_to_utf8 (0x0307, out_buffer ? out_buffer + len : NULL);
switch (c)
{
case 0x00cc:
len += g_unichar_to_utf8 (0x0300, out_buffer ? out_buffer + len : NULL);
break;
case 0x00cd:
len += g_unichar_to_utf8 (0x0301, out_buffer ? out_buffer + len : NULL);
break;
case 0x0128:
len += g_unichar_to_utf8 (0x0303, out_buffer ? out_buffer + len : NULL);
break;
}
}
else if (locale_type == LOCALE_LITHUANIAN &&
(c == 'I' || c == 'J' || c == 0x012e) &&
has_more_above (p))
{
len += g_unichar_to_utf8 (g_unichar_tolower (c), out_buffer ? out_buffer + len : NULL);
len += g_unichar_to_utf8 (0x0307, out_buffer ? out_buffer + len : NULL);
}
else if (c == 0x03A3) /* GREEK CAPITAL LETTER SIGMA */
{
if ((max_len < 0 || p < str + max_len) && *p)
{
gunichar next_c = g_utf8_get_char (p);
int next_type = TYPE(next_c);
/* SIGMA mapps differently depending on whether it is
* final or not. The following simplified test would
* fail in the case of combining marks following the
* sigma, but I don't think that occurs in real text.
* The test here matches that in ICU.
*/
if (ISALPHA (next_type)) /* Lu,Ll,Lt,Lm,Lo */
val = 0x3c3; /* GREEK SMALL SIGMA */
else
val = 0x3c2; /* GREEK SMALL FINAL SIGMA */
}
else
val = 0x3c2; /* GREEK SMALL FINAL SIGMA */
len += g_unichar_to_utf8 (val, out_buffer ? out_buffer + len : NULL);
}
else if (IS (t,
OR (G_UNICODE_UPPERCASE_LETTER,
OR (G_UNICODE_TITLECASE_LETTER,
0))))
{
val = ATTTABLE (c >> 8, c & 0xff);
if (val >= 0x1000000)
{
len += output_special_case (out_buffer ? out_buffer + len : NULL, val - 0x1000000, t, 0);
}
else
{
if (t == G_UNICODE_TITLECASE_LETTER)
{
unsigned int i;
for (i = 0; i < G_N_ELEMENTS (title_table); ++i)
{
if (title_table[i][0] == c)
{
val = title_table[i][2];
break;
}
}
}
/* Not all uppercase letters are guaranteed to have a lowercase
* equivalent. If this is the case, val will be zero. */
len += g_unichar_to_utf8 (val ? val : c, out_buffer ? out_buffer + len : NULL);
}
}
else
{
gsize char_len = g_utf8_skip[*(guchar *)last];
if (out_buffer)
memcpy (out_buffer + len, last, char_len);
len += char_len;
}
}
return len;
}
/**
* g_utf8_strdown:
* @str: a UTF-8 encoded string
* @len: length of @str, in bytes, or -1 if @str is nul-terminated.
*
* Converts all Unicode characters in the string that have a case
* to lowercase. The exact manner that this is done depends
* on the current locale, and may result in the number of
* characters in the string changing.
*
* Return value: a newly allocated string, with all characters
* converted to lowercase.
**/
gchar *
g_utf8_strdown (const gchar *str,
gssize len)
{
gsize result_len;
LocaleType locale_type;
gchar *result;
g_return_val_if_fail (str != NULL, NULL);
locale_type = get_locale_type ();
/*
* We use a two pass approach to keep memory management simple
*/
result_len = real_tolower (str, len, NULL, locale_type);
result = g_malloc (result_len + 1);
real_tolower (str, len, result, locale_type);
result[result_len] = '\0';
return result;
}
/**
* g_utf8_casefold:
* @str: a UTF-8 encoded string
* @len: length of @str, in bytes, or -1 if @str is nul-terminated.
*
* Converts a string into a form that is independent of case. The
* result will not correspond to any particular case, but can be
* compared for equality or ordered with the results of calling
* g_utf8_casefold() on other strings.
*
* Note that calling g_utf8_casefold() followed by g_utf8_collate() is
* only an approximation to the correct linguistic case insensitive
* ordering, though it is a fairly good one. Getting this exactly
* right would require a more sophisticated collation function that
* takes case sensitivity into account. GLib does not currently
* provide such a function.
*
* Return value: a newly allocated string, that is a
* case independent form of @str.
**/
gchar *
g_utf8_casefold (const gchar *str,
gssize len)
{
GString *result;
const char *p;
g_return_val_if_fail (str != NULL, NULL);
result = g_string_new (NULL);
p = str;
while ((len < 0 || p < str + len) && *p)
{
gunichar ch = g_utf8_get_char (p);
int start = 0;
int end = G_N_ELEMENTS (casefold_table);
if (ch >= casefold_table[start].ch &&
ch <= casefold_table[end - 1].ch)
{
while (TRUE)
{
int half = (start + end) / 2;
if (ch == casefold_table[half].ch)
{
g_string_append (result, casefold_table[half].data);
goto next;
}
else if (half == start)
break;
else if (ch > casefold_table[half].ch)
start = half;
else
end = half;
}
}
g_string_append_unichar (result, g_unichar_tolower (ch));
next:
p = g_utf8_next_char (p);
}
return g_string_free (result, FALSE);
}
/**
* g_unichar_get_mirror_char:
* @ch: a Unicode character
* @mirrored_ch: location to store the mirrored character
*
* In Unicode, some characters are <firstterm>mirrored</firstterm>. This
* means that their images are mirrored horizontally in text that is laid
* out from right to left. For instance, "(" would become its mirror image,
* ")", in right-to-left text.
*
* If @ch has the Unicode mirrored property and there is another unicode
* character that typically has a glyph that is the mirror image of @ch's
* glyph and @mirrored_ch is set, it puts that character in the address
* pointed to by @mirrored_ch. Otherwise the original character is put.
*
* Return value: %TRUE if @ch has a mirrored character, %FALSE otherwise
*
* Since: 2.4
**/
gboolean
g_unichar_get_mirror_char (gunichar ch,
gunichar *mirrored_ch)
{
gboolean found;
gunichar mirrored;
mirrored = GLIB_GET_MIRRORING(ch);
found = ch != mirrored;
if (mirrored_ch)
*mirrored_ch = mirrored;
return found;
}
#define G_SCRIPT_TABLE_MIDPOINT (G_N_ELEMENTS (g_script_table) / 2)
static inline GUnicodeScript
g_unichar_get_script_bsearch (gunichar ch)
{
int lower = 0;
int upper = G_N_ELEMENTS (g_script_table) - 1;
static int saved_mid = G_SCRIPT_TABLE_MIDPOINT;
int mid = saved_mid;
do
{
if (ch < g_script_table[mid].start)
upper = mid - 1;
else if (ch >= g_script_table[mid].start + g_script_table[mid].chars)
lower = mid + 1;
else
return g_script_table[saved_mid = mid].script;
mid = (lower + upper) / 2;
}
while (lower <= upper);
return G_UNICODE_SCRIPT_UNKNOWN;
}
/**
* g_unichar_get_script:
* @ch: a Unicode character
*
* Looks up the #GUnicodeScript for a particular character (as defined
* by Unicode Standard Annex #24). No check is made for @ch being a
* valid Unicode character; if you pass in invalid character, the
* result is undefined.
*
* This function is equivalent to pango_script_for_unichar() and the
* two are interchangeable.
*
* Return value: the #GUnicodeScript for the character.
*
* Since: 2.14
*/
GUnicodeScript
g_unichar_get_script (gunichar ch)
{
if (ch < G_EASY_SCRIPTS_RANGE)
return g_script_easy_table[ch];
else
return g_unichar_get_script_bsearch (ch);
}
#define __G_UNIPROP_C__
#include "galiasdef.c"
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