1 /* parens.c -- Implementation of matching parentheses feature. */
3 /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
5 This file is part of the GNU Readline Library, a library for
6 reading lines of text with interactive input and history editing.
8 The GNU Readline Library is free software; you can redistribute it
9 and/or modify it under the terms of the GNU General Public License
10 as published by the Free Software Foundation; either version 2, or
11 (at your option) any later version.
13 The GNU Readline Library is distributed in the hope that it will be
14 useful, but WITHOUT ANY WARRANTY; without even the implied warranty
15 of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 The GNU General Public License is often shipped with GNU software, and
19 is generally kept in a file called COPYING or LICENSE. If you do not
20 have a copy of the license, write to the Free Software Foundation,
21 59 Temple Place, Suite 330, Boston, MA 02111 USA. */
22 #define READLINE_LIBRARY
26 #if defined (HAVE_CONFIG_H)
31 #include <sys/types.h>
33 #if defined (FD_SET) && !defined (HAVE_SELECT)
37 #if defined (HAVE_SELECT)
38 # include <sys/time.h>
39 #endif /* HAVE_SELECT */
40 #if defined (HAVE_SYS_SELECT_H)
41 # include <sys/select.h>
44 #if defined (HAVE_STRING_H)
46 #else /* !HAVE_STRING_H */
48 #endif /* !HAVE_STRING_H */
50 #if !defined (strchr) && !defined (__STDC__)
51 extern char *strchr (), *strrchr ();
52 #endif /* !strchr && !__STDC__ */
55 #include "rlprivate.h"
57 static int find_matching_open __P((char *, int, int));
59 /* Non-zero means try to blink the matching open parenthesis when the
60 close parenthesis is inserted. */
61 #if defined (HAVE_SELECT)
62 int rl_blink_matching_paren = 1;
63 #else /* !HAVE_SELECT */
64 int rl_blink_matching_paren = 0;
65 #endif /* !HAVE_SELECT */
67 static int _paren_blink_usec = 500000;
69 /* Change emacs_standard_keymap to have bindings for paren matching when
70 ON_OR_OFF is 1, change them back to self_insert when ON_OR_OFF == 0. */
72 _rl_enable_paren_matching (on_or_off)
77 rl_bind_key_in_map (')', rl_insert_close, emacs_standard_keymap);
78 rl_bind_key_in_map (']', rl_insert_close, emacs_standard_keymap);
79 rl_bind_key_in_map ('}', rl_insert_close, emacs_standard_keymap);
83 rl_bind_key_in_map (')', rl_insert, emacs_standard_keymap);
84 rl_bind_key_in_map (']', rl_insert, emacs_standard_keymap);
85 rl_bind_key_in_map ('}', rl_insert, emacs_standard_keymap);
90 rl_set_paren_blink_timeout (u)
95 o = _paren_blink_usec;
97 _paren_blink_usec = u;
102 rl_insert_close (count, invoking_key)
103 int count, invoking_key;
105 if (rl_explicit_arg || !rl_blink_matching_paren)
106 rl_insert (count, invoking_key);
109 #if defined (HAVE_SELECT)
110 int orig_point, match_point, ready;
111 struct timeval timer;
114 rl_insert (1, invoking_key);
115 (*rl_redisplay_function) ();
117 find_matching_open (rl_line_buffer, rl_point - 2, invoking_key);
119 /* Emacs might message or ring the bell here, but I don't. */
124 FD_SET (fileno (rl_instream), &readfds);
126 timer.tv_usec = _paren_blink_usec;
128 orig_point = rl_point;
129 rl_point = match_point;
130 (*rl_redisplay_function) ();
131 ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer);
132 rl_point = orig_point;
133 #else /* !HAVE_SELECT */
134 rl_insert (count, invoking_key);
135 #endif /* !HAVE_SELECT */
141 find_matching_open (string, from, closer)
146 int opener, level, delimiter;
150 case ']': opener = '['; break;
151 case '}': opener = '{'; break;
152 case ')': opener = '('; break;
157 level = 1; /* The closer passed in counts as 1. */
158 delimiter = 0; /* Delimited state unknown. */
160 for (i = from; i > -1; i--)
162 if (delimiter && (string[i] == delimiter))
164 else if (rl_basic_quote_characters && strchr (rl_basic_quote_characters, string[i]))
165 delimiter = string[i];
166 else if (!delimiter && (string[i] == closer))
168 else if (!delimiter && (string[i] == opener))