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d60d9f65 SS |
1 | /* parens.c -- Implementation of matching parentheses feature. */ |
2 | ||
3 | /* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc. | |
4 | ||
5 | This file is part of the GNU Readline Library, a library for | |
6 | reading lines of text with interactive input and history editing. | |
7 | ||
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 | |
1b17e766 | 10 | as published by the Free Software Foundation; either version 2, or |
d60d9f65 SS |
11 | (at your option) any later version. |
12 | ||
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. | |
17 | ||
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, | |
1b17e766 | 21 | 59 Temple Place, Suite 330, Boston, MA 02111 USA. */ |
d60d9f65 SS |
22 | #define READLINE_LIBRARY |
23 | ||
5bdf8622 DJ |
24 | #if defined (__TANDEM) |
25 | # include <floss.h> | |
26 | #endif | |
27 | ||
d60d9f65 SS |
28 | #include "rlconf.h" |
29 | ||
d60d9f65 SS |
30 | #if defined (HAVE_CONFIG_H) |
31 | # include <config.h> | |
32 | #endif | |
33 | ||
34 | #include <stdio.h> | |
35 | #include <sys/types.h> | |
36 | ||
9255ee31 EZ |
37 | #if defined (HAVE_UNISTD_H) |
38 | # include <unistd.h> | |
39 | #endif | |
40 | ||
d60d9f65 SS |
41 | #if defined (FD_SET) && !defined (HAVE_SELECT) |
42 | # define HAVE_SELECT | |
43 | #endif | |
44 | ||
45 | #if defined (HAVE_SELECT) | |
46 | # include <sys/time.h> | |
47 | #endif /* HAVE_SELECT */ | |
48 | #if defined (HAVE_SYS_SELECT_H) | |
49 | # include <sys/select.h> | |
50 | #endif | |
51 | ||
52 | #if defined (HAVE_STRING_H) | |
53 | # include <string.h> | |
54 | #else /* !HAVE_STRING_H */ | |
55 | # include <strings.h> | |
56 | #endif /* !HAVE_STRING_H */ | |
57 | ||
58 | #if !defined (strchr) && !defined (__STDC__) | |
59 | extern char *strchr (), *strrchr (); | |
60 | #endif /* !strchr && !__STDC__ */ | |
61 | ||
62 | #include "readline.h" | |
1b17e766 | 63 | #include "rlprivate.h" |
d60d9f65 | 64 | |
9255ee31 | 65 | static int find_matching_open PARAMS((char *, int, int)); |
d60d9f65 SS |
66 | |
67 | /* Non-zero means try to blink the matching open parenthesis when the | |
68 | close parenthesis is inserted. */ | |
69 | #if defined (HAVE_SELECT) | |
70 | int rl_blink_matching_paren = 1; | |
71 | #else /* !HAVE_SELECT */ | |
72 | int rl_blink_matching_paren = 0; | |
73 | #endif /* !HAVE_SELECT */ | |
74 | ||
9255ee31 EZ |
75 | static int _paren_blink_usec = 500000; |
76 | ||
1b17e766 EZ |
77 | /* Change emacs_standard_keymap to have bindings for paren matching when |
78 | ON_OR_OFF is 1, change them back to self_insert when ON_OR_OFF == 0. */ | |
79 | void | |
80 | _rl_enable_paren_matching (on_or_off) | |
81 | int on_or_off; | |
82 | { | |
83 | if (on_or_off) | |
84 | { /* ([{ */ | |
85 | rl_bind_key_in_map (')', rl_insert_close, emacs_standard_keymap); | |
86 | rl_bind_key_in_map (']', rl_insert_close, emacs_standard_keymap); | |
87 | rl_bind_key_in_map ('}', rl_insert_close, emacs_standard_keymap); | |
88 | } | |
89 | else | |
90 | { /* ([{ */ | |
91 | rl_bind_key_in_map (')', rl_insert, emacs_standard_keymap); | |
92 | rl_bind_key_in_map (']', rl_insert, emacs_standard_keymap); | |
93 | rl_bind_key_in_map ('}', rl_insert, emacs_standard_keymap); | |
94 | } | |
95 | } | |
d60d9f65 | 96 | |
9255ee31 EZ |
97 | int |
98 | rl_set_paren_blink_timeout (u) | |
99 | int u; | |
100 | { | |
101 | int o; | |
102 | ||
103 | o = _paren_blink_usec; | |
104 | if (u > 0) | |
105 | _paren_blink_usec = u; | |
106 | return (o); | |
107 | } | |
108 | ||
d60d9f65 SS |
109 | int |
110 | rl_insert_close (count, invoking_key) | |
111 | int count, invoking_key; | |
112 | { | |
113 | if (rl_explicit_arg || !rl_blink_matching_paren) | |
9255ee31 | 114 | _rl_insert_char (count, invoking_key); |
d60d9f65 SS |
115 | else |
116 | { | |
117 | #if defined (HAVE_SELECT) | |
118 | int orig_point, match_point, ready; | |
119 | struct timeval timer; | |
120 | fd_set readfds; | |
121 | ||
9255ee31 | 122 | _rl_insert_char (1, invoking_key); |
d60d9f65 SS |
123 | (*rl_redisplay_function) (); |
124 | match_point = | |
125 | find_matching_open (rl_line_buffer, rl_point - 2, invoking_key); | |
126 | ||
127 | /* Emacs might message or ring the bell here, but I don't. */ | |
128 | if (match_point < 0) | |
129 | return -1; | |
130 | ||
131 | FD_ZERO (&readfds); | |
132 | FD_SET (fileno (rl_instream), &readfds); | |
133 | timer.tv_sec = 0; | |
9255ee31 | 134 | timer.tv_usec = _paren_blink_usec; |
d60d9f65 SS |
135 | |
136 | orig_point = rl_point; | |
137 | rl_point = match_point; | |
138 | (*rl_redisplay_function) (); | |
139 | ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer); | |
140 | rl_point = orig_point; | |
141 | #else /* !HAVE_SELECT */ | |
9255ee31 | 142 | _rl_insert_char (count, invoking_key); |
d60d9f65 SS |
143 | #endif /* !HAVE_SELECT */ |
144 | } | |
145 | return 0; | |
146 | } | |
147 | ||
148 | static int | |
149 | find_matching_open (string, from, closer) | |
150 | char *string; | |
151 | int from, closer; | |
152 | { | |
153 | register int i; | |
154 | int opener, level, delimiter; | |
155 | ||
156 | switch (closer) | |
157 | { | |
158 | case ']': opener = '['; break; | |
159 | case '}': opener = '{'; break; | |
160 | case ')': opener = '('; break; | |
161 | default: | |
162 | return (-1); | |
163 | } | |
164 | ||
165 | level = 1; /* The closer passed in counts as 1. */ | |
166 | delimiter = 0; /* Delimited state unknown. */ | |
167 | ||
168 | for (i = from; i > -1; i--) | |
169 | { | |
170 | if (delimiter && (string[i] == delimiter)) | |
171 | delimiter = 0; | |
172 | else if (rl_basic_quote_characters && strchr (rl_basic_quote_characters, string[i])) | |
173 | delimiter = string[i]; | |
174 | else if (!delimiter && (string[i] == closer)) | |
175 | level++; | |
176 | else if (!delimiter && (string[i] == opener)) | |
177 | level--; | |
178 | ||
179 | if (!level) | |
180 | break; | |
181 | } | |
182 | return (i); | |
183 | } |