/* parens.c -- Implemenation of matching parenthesis 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 1, 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,   675 Mass Ave, Cambridge, MA 02139, USA. */#define READLINE_LIBRARY#include "rlconf.h"#if !defined (PAREN_MATCHING)rl_insert_close (count, invoking_key)     int count, invoking_key;{  return (rl_insert (count, invoking_key));}#else /* PAREN_MATCHING */#include <stdio.h>#include <sys/types.h>#if defined (FD_SET)#  include <sys/time.h>#endif /* FD_SET */#include "readline.h"extern int rl_explicit_arg;/* Non-zero means try to blink the matching open parenthesis when the   close parenthesis is inserted. */#if defined (FD_SET)int rl_blink_matching_paren = 1;#else /* !FD_SET */int rl_blink_matching_paren = 0;#endif /* !FD_SET */static int find_matching_open ();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 (FD_SET)      int orig_point, match_point, ready;      struct timeval timer;      fd_set readfds;      rl_insert (1, invoking_key);      rl_redisplay ();      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 = 1;      timer.tv_usec = 500;      orig_point = rl_point;      rl_point = match_point;      rl_redisplay ();      ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer);      rl_point = orig_point;#else /* !FD_SET */      rl_insert (count, invoking_key);#endif /* !FD_SET */    }  return 0;}static intfind_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 ((string[i] == '\'') || (string[i] == '"'))	delimiter = rl_line_buffer[i];      else if (!delimiter && (string[i] == closer))	level++;      else if (!delimiter && (string[i] == opener))	level--;      if (!level)	break;    }  return (i);}#endif /* PAREN_MATCHING */