glib/gunibreak.c

   1 /* gunibreak.c - line break properties
   2  *
   3  *  Copyright 2000 Red Hat, Inc.
   4  *
   5  * The Gnome Library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public License as
   7  * published by the Free Software Foundation; either version 2 of the
   8  * License, or (at your option) any later version.
   9  *
  10  * The Gnome Library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with the Gnome Library; see the file COPYING.LIB.  If not,
  17  * see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include "config.h"
  21
  22 #include <stdlib.h>
  23
  24 #include "gunibreak.h"
  25
  26 #define TPROP_PART1(Page, Char) \
  27   ((break_property_table_part1[Page] >= G_UNICODE_MAX_TABLE_INDEX) \
  28    ? (break_property_table_part1[Page] - G_UNICODE_MAX_TABLE_INDEX) \
  29    : (break_property_data[break_property_table_part1[Page]][Char]))
  30
  31 #define TPROP_PART2(Page, Char) \
  32   ((break_property_table_part2[Page] >= G_UNICODE_MAX_TABLE_INDEX) \
  33    ? (break_property_table_part2[Page] - G_UNICODE_MAX_TABLE_INDEX) \
  34    : (break_property_data[break_property_table_part2[Page]][Char]))
  35
  36 #define PROP(Char) \
  37   (((Char) <= G_UNICODE_LAST_CHAR_PART1) \
  38    ? TPROP_PART1 ((Char) >> 8, (Char) & 0xff) \
  39    : (((Char) >= 0xe0000 && (Char) <= G_UNICODE_LAST_CHAR) \
  40       ? TPROP_PART2 (((Char) - 0xe0000) >> 8, (Char) & 0xff) \
  41       : G_UNICODE_BREAK_UNKNOWN))
  42
  43 /**
  44  * g_unichar_break_type:
  45  * @c: a Unicode character
  46  *
  47  * Determines the break type of @c. @c should be a Unicode character
  48  * (to derive a character from UTF-8 encoded text, use
  49  * g_utf8_get_char()). The break type is used to find word and line
  50  * breaks ("text boundaries"), Pango implements the Unicode boundary
  51  * resolution algorithms and normally you would use a function such
  52  * as pango_break() instead of caring about break types yourself.
  53  *
  54  * Returns: the break type of @c
  55  **/
  56 GUnicodeBreakType
  57 g_unichar_break_type (gunichar c)
  58 {
  59   return PROP (c);
  60 }