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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 "gunicode.h"
#include "gscripttable.h"
#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);
}
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