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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);

}