157 lines
3.9 KiB
C
157 lines
3.9 KiB
C
/* 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 1, 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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675 Mass Ave, Cambridge, MA 02139, USA. */
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#define READLINE_LIBRARY
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#include "rlconf.h"
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#if !defined (PAREN_MATCHING)
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extern int rl_insert ();
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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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return (rl_insert (count, invoking_key));
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}
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#else /* PAREN_MATCHING */
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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 (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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extern int rl_explicit_arg;
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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 find_matching_open ();
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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 (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 (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 = 500;
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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 (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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#endif /* PAREN_MATCHING */
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