parens.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:4k
- /* 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 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)
- extern int rl_insert ();
- int
- rl_insert_close (count, invoking_key)
- int count, invoking_key;
- {
- return (rl_insert (count, invoking_key));
- }
- #else /* PAREN_MATCHING */
- #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"
- extern int rl_explicit_arg;
- /* 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 */
- static int find_matching_open ();
- 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);
- }
- #endif /* PAREN_MATCHING */