glib/guniprop.c

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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 "glib.h"
#include "gunichartables.h"
#include <config.h>
#include <stddef.h>
#define asize(x) ((sizeof (x)) / sizeof (x[0]))
#define ATTTABLE(Page, Char) \
((attr_table[Page] == 0) ? 0 : (attr_table[Page][Char]))
/* We cheat a bit and cast type values to (char *). We detect these
using the &0xff trick. */
#define TTYPE(Page, Char) \
(((GPOINTER_TO_INT(type_table[Page]) & 0xff) == GPOINTER_TO_INT(type_table[Page])) \
? GPOINTER_TO_INT(type_table[Page]) \
: (type_table[Page][Char]))
#define TYPE(Char) (((Char) > (G_UNICODE_LAST_CHAR)) ? G_UNICODE_UNASSIGNED : TTYPE ((Char) >> 8, (Char) & 0xff))
#define ISDIGIT(Type) ((Type) == G_UNICODE_DECIMAL_NUMBER \
|| (Type) == G_UNICODE_LETTER_NUMBER \
|| (Type) == G_UNICODE_OTHER_NUMBER)
#define ISALPHA(Type) ((Type) == G_UNICODE_LOWERCASE_LETTER \
|| (Type) == G_UNICODE_UPPERCASE_LETTER \
|| (Type) == G_UNICODE_TITLECASE_LETTER \
|| (Type) == G_UNICODE_MODIFIER_LETTER \
|| (Type) == G_UNICODE_OTHER_LETTER)
gboolean
g_unichar_isalnum (gunichar c)
{
int t = TYPE (c);
return ISDIGIT (t) || ISALPHA (t);
}
gboolean
g_unichar_isalpha (gunichar c)
{
int t = TYPE (c);
return ISALPHA (t);
}
gboolean
g_unichar_iscntrl (gunichar c)
{
return TYPE (c) == G_UNICODE_CONTROL;
}
gboolean
g_unichar_isdigit (gunichar c)
{
return TYPE (c) == G_UNICODE_DECIMAL_NUMBER;
}
gboolean
g_unichar_isgraph (gunichar c)
{
int t = TYPE (c);
return (t != G_UNICODE_CONTROL
&& t != G_UNICODE_FORMAT
&& t != G_UNICODE_UNASSIGNED
&& t != G_UNICODE_PRIVATE_USE
&& t != G_UNICODE_SURROGATE
&& t != G_UNICODE_SPACE_SEPARATOR);
}
gboolean
g_unichar_islower (gunichar c)
{
return TYPE (c) == G_UNICODE_LOWERCASE_LETTER;
}
gboolean
g_unichar_isprint (gunichar c)
{
int t = TYPE (c);
return (t != G_UNICODE_CONTROL
&& t != G_UNICODE_FORMAT
&& t != G_UNICODE_UNASSIGNED
&& t != G_UNICODE_PRIVATE_USE
&& t != G_UNICODE_SURROGATE);
}
gboolean
g_unichar_ispunct (gunichar c)
{
int t = TYPE (c);
return (t == G_UNICODE_CONNECT_PUNCTUATION || t == G_UNICODE_DASH_PUNCTUATION
|| t == G_UNICODE_CLOSE_PUNCTUATION || t == G_UNICODE_FINAL_PUNCTUATION
|| t == G_UNICODE_INITIAL_PUNCTUATION || t == G_UNICODE_OTHER_PUNCTUATION
|| t == G_UNICODE_OPEN_PUNCTUATION);
}
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':
case '\v': /* vertical tab - as if anyone has ever used this... */
return TRUE;
break;
default:
{
int t = TYPE (c);
return (t == G_UNICODE_SPACE_SEPARATOR || t == G_UNICODE_LINE_SEPARATOR
|| t == G_UNICODE_PARAGRAPH_SEPARATOR);
}
break;
}
}
/**
* g_unichar_isupper:
* @c: a unicode character
*
* Determines if a character is uppercase.
*
* Return value:
**/
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 < asize (title_table); ++i)
if (title_table[i][0] == c)
return 1;
return 0;
}
/**
* g_unichar_isxdigit:
* @c: a unicode character.
*
* Determines if a characters is a hexidecimal digit
*
* Return value: %TRUE if the character is a hexidecimal digit.
**/
gboolean
g_unichar_isxdigit (gunichar c)
{
int t = TYPE (c);
return ((c >= 'a' && c <= 'f')
|| (c >= 'A' && c <= 'F')
|| ISDIGIT (t));
}
/**
* 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)
{
int t = TYPE (c);
return t != G_UNICODE_UNASSIGNED;
}
/**
* 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.
**/
/* This function stolen from Markus Kuhn <Markus.Kuhn@cl.cam.ac.uk>. */
gboolean
g_unichar_iswide (gunichar c)
{
if (c < 0x1100)
return 0;
return ((c >= 0x1100 && c <= 0x115f) /* Hangul Jamo */
|| (c >= 0x2e80 && c <= 0xa4cf && (c & ~0x0011) != 0x300a &&
c != 0x303f) /* CJK ... Yi */
|| (c >= 0xac00 && c <= 0xd7a3) /* Hangul Syllables */
|| (c >= 0xf900 && c <= 0xfaff) /* CJK Compatibility Ideographs */
|| (c >= 0xfe30 && c <= 0xfe6f) /* CJK Compatibility Forms */
|| (c >= 0xff00 && c <= 0xff5f) /* Fullwidth Forms */
|| (c >= 0xffe0 && c <= 0xffe6));
}
/**
* g_unichar_toupper:
* @c: a unicode character
*
* Convert a character to uppercase.
*
* Return value: the result of converting @c to uppercase.
* If @c is not an lowercase or titlecase character,
* @c is returned unchanged.
**/
gunichar
g_unichar_toupper (gunichar c)
{
int t = TYPE (c);
if (t == G_UNICODE_LOWERCASE_LETTER)
return ATTTABLE (c >> 8, c & 0xff);
else if (t == G_UNICODE_TITLECASE_LETTER)
{
unsigned int i;
for (i = 0; i < asize (title_table); ++i)
{
if (title_table[i][0] == c)
return title_table[i][1];
}
}
return c;
}
/**
* g_unichar_tolower:
* @c: a unicode character.
*
* Convert a character to lower case
*
* Return value: the result of converting @c to lower case.
* If @c is not an upperlower or titlecase character,
* @c is returned unchanged.
**/
gunichar
g_unichar_tolower (gunichar c)
{
int t = TYPE (c);
if (t == G_UNICODE_UPPERCASE_LETTER)
return ATTTABLE (c >> 8, c & 0xff);
else if (t == G_UNICODE_TITLECASE_LETTER)
{
unsigned int i;
for (i = 0; i < asize (title_table); ++i)
{
if (title_table[i][0] == c)
return title_table[i][2];
}
}
return c;
}
/**
* g_unichar_totitle:
* @c: a unicode character
*
* Convert 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 < asize (title_table); ++i)
{
if (title_table[i][0] == c || title_table[i][1] == c
|| title_table[i][2] == c)
return title_table[i][0];
}
return (TYPE (c) == G_UNICODE_LOWERCASE_LETTER
? ATTTABLE (c >> 8, c & 0xff)
: c);
}
/**
* g_unichar_xdigit_value:
* @c: a unicode character
*
* Determines the numeric value of a character as a decimal
* degital.
*
* 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
* degital.
*
* 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' + 1;
if (c >= 'a' && c <= 'f')
return c - 'a' + 1;
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 typ of the character.
**/
GUnicodeType
g_unichar_type (gunichar c)
{
return TYPE (c);
}