glib/gunibreak.c

   1 /* gunibreak.c - line break properties
   2  *
   3  *  Copyright 2000 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This 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 License
  16  * along with this library; if not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include "config.h"
  20
  21 #include <stdlib.h>
  22
  23 #include "gunibreak.h"
  24
  25 #define TPROP_PART1(Page, Char) \
  26   ((break_property_table_part1[Page] >= G_UNICODE_MAX_TABLE_INDEX) \
  27    ? (break_property_table_part1[Page] - G_UNICODE_MAX_TABLE_INDEX) \
  28    : (break_property_data[break_property_table_part1[Page]][Char]))
  29
  30 #define TPROP_PART2(Page, Char) \
  31   ((break_property_table_part2[Page] >= G_UNICODE_MAX_TABLE_INDEX) \
  32    ? (break_property_table_part2[Page] - G_UNICODE_MAX_TABLE_INDEX) \
  33    : (break_property_data[break_property_table_part2[Page]][Char]))
  34
  35 #define PROP(Char) \
  36   (((Char) <= G_UNICODE_LAST_CHAR_PART1) \
  37    ? TPROP_PART1 ((Char) >> 8, (Char) & 0xff) \
  38    : (((Char) >= 0xe0000 && (Char) <= G_UNICODE_LAST_CHAR) \
  39       ? TPROP_PART2 (((Char) - 0xe0000) >> 8, (Char) & 0xff) \
  40       : G_UNICODE_BREAK_UNKNOWN))
  41
  42 /**
  43  * g_unichar_break_type:
  44  * @c: a Unicode character
  45  *
  46  * Determines the break type of @c. @c should be a Unicode character
  47  * (to derive a character from UTF-8 encoded text, use
  48  * g_utf8_get_char()). The break type is used to find word and line
  49  * breaks ("text boundaries"), Pango implements the Unicode boundary
  50  * resolution algorithms and normally you would use a function such
  51  * as pango_break() instead of caring about break types yourself.
  52  *
  53  * Returns: the break type of @c
  54  **/
  55 GUnicodeBreakType
  56 g_unichar_break_type (gunichar c)
  57 {
  58   return PROP (c);
  59 }