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/* parens.c -- Implementation of matching parentheses feature. */
/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
This file is part of the GNU Readline Library, a library for
reading lines of text with interactive input and history editing.
The GNU Readline Library 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, or
(at your option) any later version.
The GNU Readline 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 General Public License for more details.
The GNU General Public License is often shipped with GNU software, and
is generally kept in a file called COPYING or LICENSE. If you do not
have a copy of the license, write to the Free Software Foundation,
59 Temple Place, Suite 330, Boston, MA 02111 USA. */
#define READLINE_LIBRARY
#include "rlconf.h"
#if defined (HAVE_CONFIG_H)
# include <config.h>
#endif
#include <stdio.h>
#include <sys/types.h>
#if defined (FD_SET) && !defined (HAVE_SELECT)
# define HAVE_SELECT
#endif
#if defined (HAVE_SELECT)
# include <sys/time.h>
#endif /* HAVE_SELECT */
#if defined (HAVE_SYS_SELECT_H)
# include <sys/select.h>
#endif
#if defined (HAVE_STRING_H)
# include <string.h>
#else /* !HAVE_STRING_H */
# include <strings.h>
#endif /* !HAVE_STRING_H */
#if !defined (strchr) && !defined (__STDC__)
extern char *strchr (), *strrchr ();
#endif /* !strchr && !__STDC__ */
#include "readline.h"
#include "rlprivate.h"
static int find_matching_open __P((char *, int, int));
/* Non-zero means try to blink the matching open parenthesis when the
close parenthesis is inserted. */
#if defined (HAVE_SELECT)
int rl_blink_matching_paren = 1;
#else /* !HAVE_SELECT */
int rl_blink_matching_paren = 0;
#endif /* !HAVE_SELECT */
/* Change emacs_standard_keymap to have bindings for paren matching when
ON_OR_OFF is 1, change them back to self_insert when ON_OR_OFF == 0. */
void
_rl_enable_paren_matching (on_or_off)
int on_or_off;
{
if (on_or_off)
{ /* ([{ */
rl_bind_key_in_map (')', rl_insert_close, emacs_standard_keymap);
rl_bind_key_in_map (']', rl_insert_close, emacs_standard_keymap);
rl_bind_key_in_map ('}', rl_insert_close, emacs_standard_keymap);
}
else
{ /* ([{ */
rl_bind_key_in_map (')', rl_insert, emacs_standard_keymap);
rl_bind_key_in_map (']', rl_insert, emacs_standard_keymap);
rl_bind_key_in_map ('}', rl_insert, emacs_standard_keymap);
}
}
int
rl_insert_close (count, invoking_key)
int count, invoking_key;
{
if (rl_explicit_arg || !rl_blink_matching_paren)
rl_insert (count, invoking_key);
else
{
#if defined (HAVE_SELECT)
int orig_point, match_point, ready;
struct timeval timer;
fd_set readfds;
rl_insert (1, invoking_key);
(*rl_redisplay_function) ();
match_point =
find_matching_open (rl_line_buffer, rl_point - 2, invoking_key);
/* Emacs might message or ring the bell here, but I don't. */
if (match_point < 0)
return -1;
FD_ZERO (&readfds);
FD_SET (fileno (rl_instream), &readfds);
timer.tv_sec = 0;
timer.tv_usec = 500000;
orig_point = rl_point;
rl_point = match_point;
(*rl_redisplay_function) ();
ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer);
rl_point = orig_point;
#else /* !HAVE_SELECT */
rl_insert (count, invoking_key);
#endif /* !HAVE_SELECT */
}
return 0;
}
static int
find_matching_open (string, from, closer)
char *string;
int from, closer;
{
register int i;
int opener, level, delimiter;
switch (closer)
{
case ']': opener = '['; break;
case '}': opener = '{'; break;
case ')': opener = '('; break;
default:
return (-1);
}
level = 1; /* The closer passed in counts as 1. */
delimiter = 0; /* Delimited state unknown. */
for (i = from; i > -1; i--)
{
if (delimiter && (string[i] == delimiter))
delimiter = 0;
else if (rl_basic_quote_characters && strchr (rl_basic_quote_characters, string[i]))
delimiter = string[i];
else if (!delimiter && (string[i] == closer))
level++;
else if (!delimiter && (string[i] == opener))
level--;
if (!level)
break;
}
return (i);
}
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