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/*
Internal file viewer for the Midnight Commander
Functions for searching in nroff-like view
Copyright (C) 1994-2024
Free Software Foundation, Inc.
Written by:
Miguel de Icaza, 1994, 1995, 1998
Janne Kukonlehto, 1994, 1995
Jakub Jelinek, 1995
Joseph M. Hinkle, 1996
Norbert Warmuth, 1997
Pavel Machek, 1998
Roland Illig <roland.illig@gmx.de>, 2004, 2005
Slava Zanko <slavazanko@google.com>, 2009
Andrew Borodin <aborodin@vmail.ru>, 2009
Ilia Maslakov <il.smind@gmail.com>, 2009
This file is part of the Midnight Commander.
The Midnight Commander 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 3 of the License,
or (at your option) any later version.
The Midnight Commander 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, see <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#include "lib/global.h"
#include "lib/tty/tty.h"
#include "lib/skin.h"
#ifdef HAVE_CHARSET
#include "lib/charsets.h"
#endif
#include "internal.h"
/*** global variables ****************************************************************************/
/*** file scope macro definitions ****************************************************************/
/*** file scope type declarations ****************************************************************/
/*** forward declarations (file scope functions) *************************************************/
/*** file scope variables ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
/*** file scope functions ************************************************************************/
/* --------------------------------------------------------------------------------------------- */
static gboolean
mcview_nroff_get_char (mcview_nroff_t * nroff, int *ret_val, off_t nroff_index)
{
int c = 0;
#ifdef HAVE_CHARSET
if (nroff->view->utf8)
{
if (!mcview_get_utf (nroff->view, nroff_index, &c, &nroff->char_length))
{
/* we need got symbol in any case */
nroff->char_length = 1;
if (!mcview_get_byte (nroff->view, nroff_index, &c) || !g_ascii_isprint (c))
return FALSE;
}
}
else
#endif
{
nroff->char_length = 1;
if (!mcview_get_byte (nroff->view, nroff_index, &c))
return FALSE;
}
*ret_val = c;
return g_unichar_isprint (c);
}
/* --------------------------------------------------------------------------------------------- */
/*** public functions ****************************************************************************/
/* --------------------------------------------------------------------------------------------- */
int
mcview__get_nroff_real_len (WView * view, off_t start, off_t length)
{
mcview_nroff_t *nroff;
int ret = 0;
off_t i = 0;
if (!view->mode_flags.nroff)
return 0;
nroff = mcview_nroff_seq_new_num (view, start);
if (nroff == NULL)
return 0;
while (i < length)
{
switch (nroff->type)
{
case NROFF_TYPE_BOLD:
ret += 1 + nroff->char_length; /* real char length and 0x8 */
break;
case NROFF_TYPE_UNDERLINE:
ret += 2; /* underline symbol and ox8 */
break;
default:
break;
}
i += nroff->char_length;
mcview_nroff_seq_next (nroff);
}
mcview_nroff_seq_free (&nroff);
return ret;
}
/* --------------------------------------------------------------------------------------------- */
mcview_nroff_t *
mcview_nroff_seq_new_num (WView * view, off_t lc_index)
{
mcview_nroff_t *nroff;
nroff = g_try_malloc0 (sizeof (mcview_nroff_t));
if (nroff != NULL)
{
nroff->index = lc_index;
nroff->view = view;
mcview_nroff_seq_info (nroff);
}
return nroff;
}
/* --------------------------------------------------------------------------------------------- */
mcview_nroff_t *
mcview_nroff_seq_new (WView * view)
{
return mcview_nroff_seq_new_num (view, (off_t) 0);
}
/* --------------------------------------------------------------------------------------------- */
void
mcview_nroff_seq_free (mcview_nroff_t ** nroff)
{
if (nroff == NULL || *nroff == NULL)
return;
MC_PTR_FREE (*nroff);
}
/* --------------------------------------------------------------------------------------------- */
nroff_type_t
mcview_nroff_seq_info (mcview_nroff_t * nroff)
{
int next, next2;
if (nroff == NULL)
return NROFF_TYPE_NONE;
nroff->type = NROFF_TYPE_NONE;
if (!mcview_nroff_get_char (nroff, &nroff->current_char, nroff->index))
return nroff->type;
if (!mcview_get_byte (nroff->view, nroff->index + nroff->char_length, &next) || next != '\b')
return nroff->type;
if (!mcview_nroff_get_char (nroff, &next2, nroff->index + 1 + nroff->char_length))
return nroff->type;
if (nroff->current_char == '_' && next2 == '_')
{
nroff->type = (nroff->prev_type == NROFF_TYPE_BOLD)
? NROFF_TYPE_BOLD : NROFF_TYPE_UNDERLINE;
}
else if (nroff->current_char == next2)
{
nroff->type = NROFF_TYPE_BOLD;
}
else if (nroff->current_char == '_')
{
nroff->current_char = next2;
nroff->type = NROFF_TYPE_UNDERLINE;
}
else if (nroff->current_char == '+' && next2 == 'o')
{
/* ??? */
}
return nroff->type;
}
/* --------------------------------------------------------------------------------------------- */
int
mcview_nroff_seq_next (mcview_nroff_t * nroff)
{
if (nroff == NULL)
return -1;
nroff->prev_type = nroff->type;
switch (nroff->type)
{
case NROFF_TYPE_BOLD:
nroff->index += 1 + nroff->char_length;
break;
case NROFF_TYPE_UNDERLINE:
nroff->index += 2;
break;
default:
break;
}
nroff->index += nroff->char_length;
mcview_nroff_seq_info (nroff);
return nroff->current_char;
}
/* --------------------------------------------------------------------------------------------- */
int
mcview_nroff_seq_prev (mcview_nroff_t * nroff)
{
int prev;
off_t prev_index, prev_index2;
if (nroff == NULL)
return -1;
nroff->prev_type = NROFF_TYPE_NONE;
if (nroff->index == 0)
return -1;
prev_index = nroff->index - 1;
while (prev_index != 0)
{
if (mcview_nroff_get_char (nroff, &nroff->current_char, prev_index))
break;
prev_index--;
}
if (prev_index == 0)
{
nroff->index--;
mcview_nroff_seq_info (nroff);
return nroff->current_char;
}
prev_index--;
if (!mcview_get_byte (nroff->view, prev_index, &prev) || prev != '\b')
{
nroff->index = prev_index;
mcview_nroff_seq_info (nroff);
return nroff->current_char;
}
prev_index2 = prev_index - 1;
while (prev_index2 != 0)
{
if (mcview_nroff_get_char (nroff, &prev, prev_index))
break;
prev_index2--;
}
nroff->index = (prev_index2 == 0) ? prev_index : prev_index2;
mcview_nroff_seq_info (nroff);
return nroff->current_char;
}
/* --------------------------------------------------------------------------------------------- */
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