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/*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* See the COPYING file for license information.
*
* Guillaume Chazarain <guichaz@gmail.com>
*/
/*****************************************
* Try to add unique mnemonics to labels *
*****************************************/
#include <string.h> /* strlen(), memcpy() */
#include "gliv.h"
#include "mnemonics.h"
#include "str_utils.h"
static GSList *stack = NULL;
static GHashTable *mnemonics = NULL;
static gint count_underscores(const gchar * str, gint len)
{
gint nb_underscores = 0;
const gulong *long_ptr;
while ((gulong) str & (sizeof(gulong) - 1))
switch (*str) {
case '\0':
return nb_underscores;
case '_':
nb_underscores++;
/* Fall through */
default:
str++;
len--;
}
long_ptr = (gulong *) str;
while (len >= sizeof(gulong)) {
gulong masked = *long_ptr ^ LONG_MASK(0x5F5F5F5FL, 0x5F5F5F5F5F5F5F5FL);
if (HAS_ZERO(masked)) {
/* A '_' has been detected. */
gchar *char_ptr = (gchar *) & masked;
gint i;
for (i = 0; i < sizeof(gulong); i++)
nb_underscores += (*char_ptr++ == 0);
}
long_ptr++;
len -= sizeof(gulong);
}
str = (const gchar *) long_ptr;
while (len > 0) {
nb_underscores += (*str == '_');
str++;
len--;
}
return nb_underscores;
}
static const gchar *find_mnemonic_position(const gchar * str)
{
const gchar *ptr;
for (ptr = str; *ptr != '\0'; ptr = g_utf8_next_char(ptr)) {
gunichar ch = g_unichar_tolower(g_utf8_get_char(ptr));
gpointer ch_key = GINT_TO_POINTER(ch);
if (g_unichar_isalnum(ch)) {
if (mnemonics == NULL) {
mnemonics = g_hash_table_new(g_direct_hash, g_direct_equal);
g_hash_table_insert(mnemonics, ch_key, mnemonics);
return ptr;
}
if (g_hash_table_lookup(mnemonics, ch_key) == NULL) {
g_hash_table_insert(mnemonics, ch_key, mnemonics);
return ptr;
}
}
}
/* No position found, add in front. */
return str;
}
/*
* Underscores in labels are replaced with mnemonics, so we duplicate them.
* The caller has to determine whether the returned string has to be freed.
*/
static gchar *duplicate_underscores(const gchar * orig)
{
gint nb_underscores, len;
const gchar *ptr_orig;
gchar *new, *ptr_new;
/* How many underscores? */
len = strlen(orig);
nb_underscores = count_underscores(orig, len);
len += nb_underscores;
if (nb_underscores == 0)
return (gchar *) orig;
ptr_new = new = g_new(gchar, len + 1);
for (ptr_orig = orig; *ptr_orig != '\0'; ptr_orig++) {
*ptr_new = *ptr_orig;
if (*ptr_orig == '_') {
/* Duplicate this one. */
ptr_new++;
*ptr_new = '_';
}
ptr_new++;
}
*ptr_new = '\0';
return new;
}
/*
* The returned string should not be freed. We keep track of already used
* mnemonics to avoid giving twice the same letter.
*/
const gchar *add_mnemonic(const gchar * str)
{
static gchar *result = NULL;
static gint size = 0;
const gchar *mnemonic_pos, *end;
gint new_size, offset;
gchar *work;
work = duplicate_underscores(str);
mnemonic_pos = find_mnemonic_position(work);
end = mnemonic_pos + strlen(mnemonic_pos);
/* + 2: '_' and '\0'. */
new_size = end - work + 2;
if (new_size > size) {
size = new_size;
g_free(result);
result = g_new(gchar, size);
}
offset = mnemonic_pos - work;
memcpy(result, work, offset);
result[offset] = '_';
memcpy(result + offset + 1, mnemonic_pos, end - mnemonic_pos + 1);
if (work != str)
g_free(work);
return result;
}
void reset_mnemonics(void)
{
if (mnemonics != NULL) {
g_hash_table_destroy(mnemonics);
mnemonics = NULL;
}
}
void push_mnemonics(void)
{
stack = g_slist_prepend(stack, mnemonics);
mnemonics = NULL;
}
void pop_mnemonics(void)
{
reset_mnemonics();
mnemonics = g_slist_nth_data(stack, 0);
stack = g_slist_delete_link(stack, stack);
}
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