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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [readline/] [parens.c] - Blame information for rev 280

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1 24 jeremybenn
/* parens.c -- Implementation of matching parentheses feature. */
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/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
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   This file is part of the GNU Readline Library, a library for
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   reading lines of text with interactive input and history editing.
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   The GNU Readline Library is free software; you can redistribute it
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   and/or modify it under the terms of the GNU General Public License
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   as published by the Free Software Foundation; either version 2, or
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   (at your option) any later version.
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   The GNU Readline Library is distributed in the hope that it will be
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   useful, but WITHOUT ANY WARRANTY; without even the implied warranty
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   of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   The GNU General Public License is often shipped with GNU software, and
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   is generally kept in a file called COPYING or LICENSE.  If you do not
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   have a copy of the license, write to the Free Software Foundation,
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   59 Temple Place, Suite 330, Boston, MA 02111 USA. */
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#define READLINE_LIBRARY
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#if defined (__TANDEM)
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#  include <floss.h>
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#endif
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#include "rlconf.h"
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#if defined (HAVE_CONFIG_H)
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#  include <config.h>
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#endif
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#include <stdio.h>
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#include <sys/types.h>
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#if defined (HAVE_UNISTD_H)
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#  include <unistd.h>
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#endif
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#if defined (FD_SET) && !defined (HAVE_SELECT)
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#  define HAVE_SELECT
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#endif
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#if defined (HAVE_SELECT)
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#  include <sys/time.h>
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#endif /* HAVE_SELECT */
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#if defined (HAVE_SYS_SELECT_H)
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#  include <sys/select.h>
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#endif
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#if defined (HAVE_STRING_H)
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#  include <string.h>
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#else /* !HAVE_STRING_H */
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#  include <strings.h>
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#endif /* !HAVE_STRING_H */
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#if !defined (strchr) && !defined (__STDC__)
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extern char *strchr (), *strrchr ();
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#endif /* !strchr && !__STDC__ */
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#include "readline.h"
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#include "rlprivate.h"
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static int find_matching_open PARAMS((char *, int, int));
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/* Non-zero means try to blink the matching open parenthesis when the
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   close parenthesis is inserted. */
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#if defined (HAVE_SELECT)
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int rl_blink_matching_paren = 1;
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#else /* !HAVE_SELECT */
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int rl_blink_matching_paren = 0;
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#endif /* !HAVE_SELECT */
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static int _paren_blink_usec = 500000;
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/* Change emacs_standard_keymap to have bindings for paren matching when
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   ON_OR_OFF is 1, change them back to self_insert when ON_OR_OFF == 0. */
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void
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_rl_enable_paren_matching (on_or_off)
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     int on_or_off;
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{
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  if (on_or_off)
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    {   /* ([{ */
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      rl_bind_key_in_map (')', rl_insert_close, emacs_standard_keymap);
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      rl_bind_key_in_map (']', rl_insert_close, emacs_standard_keymap);
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      rl_bind_key_in_map ('}', rl_insert_close, emacs_standard_keymap);
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    }
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  else
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    {   /* ([{ */
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      rl_bind_key_in_map (')', rl_insert, emacs_standard_keymap);
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      rl_bind_key_in_map (']', rl_insert, emacs_standard_keymap);
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      rl_bind_key_in_map ('}', rl_insert, emacs_standard_keymap);
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    }
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}
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int
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rl_set_paren_blink_timeout (u)
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     int u;
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{
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  int o;
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  o = _paren_blink_usec;
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  if (u > 0)
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    _paren_blink_usec = u;
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  return (o);
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}
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int
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rl_insert_close (count, invoking_key)
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     int count, invoking_key;
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{
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  if (rl_explicit_arg || !rl_blink_matching_paren)
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    _rl_insert_char (count, invoking_key);
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  else
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    {
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#if defined (HAVE_SELECT)
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      int orig_point, match_point, ready;
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      struct timeval timer;
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      fd_set readfds;
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      _rl_insert_char (1, invoking_key);
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      (*rl_redisplay_function) ();
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      match_point =
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        find_matching_open (rl_line_buffer, rl_point - 2, invoking_key);
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      /* Emacs might message or ring the bell here, but I don't. */
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      if (match_point < 0)
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        return -1;
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      FD_ZERO (&readfds);
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      FD_SET (fileno (rl_instream), &readfds);
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      timer.tv_sec = 0;
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      timer.tv_usec = _paren_blink_usec;
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      orig_point = rl_point;
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      rl_point = match_point;
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      (*rl_redisplay_function) ();
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      ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer);
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      rl_point = orig_point;
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#else /* !HAVE_SELECT */
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      _rl_insert_char (count, invoking_key);
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#endif /* !HAVE_SELECT */
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    }
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  return 0;
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}
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static int
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find_matching_open (string, from, closer)
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     char *string;
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     int from, closer;
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{
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  register int i;
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  int opener, level, delimiter;
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  switch (closer)
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    {
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    case ']': opener = '['; break;
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    case '}': opener = '{'; break;
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    case ')': opener = '('; break;
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    default:
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      return (-1);
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    }
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  level = 1;                    /* The closer passed in counts as 1. */
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  delimiter = 0;         /* Delimited state unknown. */
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  for (i = from; i > -1; i--)
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    {
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      if (delimiter && (string[i] == delimiter))
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        delimiter = 0;
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      else if (rl_basic_quote_characters && strchr (rl_basic_quote_characters, string[i]))
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        delimiter = string[i];
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      else if (!delimiter && (string[i] == closer))
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        level++;
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      else if (!delimiter && (string[i] == opener))
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        level--;
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      if (!level)
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        break;
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    }
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  return (i);
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}

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