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cc88a640 | 1 | /* parens.c -- implementation of matching parentheses feature. */ |
d60d9f65 | 2 | |
cc88a640 | 3 | /* Copyright (C) 1987, 1989, 1992-2009 Free Software Foundation, Inc. |
d60d9f65 | 4 | |
cc88a640 JK |
5 | This file is part of the GNU Readline Library (Readline), a library |
6 | for reading lines of text with interactive input and history editing. | |
d60d9f65 | 7 | |
cc88a640 JK |
8 | Readline is free software: you can redistribute it and/or modify |
9 | it under the terms of the GNU General Public License as published by | |
10 | the Free Software Foundation, either version 3 of the License, or | |
d60d9f65 SS |
11 | (at your option) any later version. |
12 | ||
cc88a640 JK |
13 | Readline is distributed in the hope that it will be useful, |
14 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
d60d9f65 SS |
16 | GNU General Public License for more details. |
17 | ||
cc88a640 JK |
18 | You should have received a copy of the GNU General Public License |
19 | along with Readline. If not, see <http://www.gnu.org/licenses/>. | |
20 | */ | |
21 | ||
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 | ||
cc88a640 | 41 | #include "posixselect.h" |
d60d9f65 SS |
42 | |
43 | #if defined (HAVE_STRING_H) | |
44 | # include <string.h> | |
45 | #else /* !HAVE_STRING_H */ | |
46 | # include <strings.h> | |
47 | #endif /* !HAVE_STRING_H */ | |
48 | ||
49 | #if !defined (strchr) && !defined (__STDC__) | |
50 | extern char *strchr (), *strrchr (); | |
51 | #endif /* !strchr && !__STDC__ */ | |
52 | ||
53 | #include "readline.h" | |
1b17e766 | 54 | #include "rlprivate.h" |
d60d9f65 | 55 | |
9255ee31 | 56 | static int find_matching_open PARAMS((char *, int, int)); |
d60d9f65 SS |
57 | |
58 | /* Non-zero means try to blink the matching open parenthesis when the | |
59 | close parenthesis is inserted. */ | |
d60d9f65 | 60 | int rl_blink_matching_paren = 0; |
d60d9f65 | 61 | |
9255ee31 EZ |
62 | static int _paren_blink_usec = 500000; |
63 | ||
1b17e766 EZ |
64 | /* Change emacs_standard_keymap to have bindings for paren matching when |
65 | ON_OR_OFF is 1, change them back to self_insert when ON_OR_OFF == 0. */ | |
66 | void | |
67 | _rl_enable_paren_matching (on_or_off) | |
68 | int on_or_off; | |
69 | { | |
70 | if (on_or_off) | |
4a11f206 PP |
71 | { |
72 | /* ([{ */ | |
1b17e766 EZ |
73 | rl_bind_key_in_map (')', rl_insert_close, emacs_standard_keymap); |
74 | rl_bind_key_in_map (']', rl_insert_close, emacs_standard_keymap); | |
75 | rl_bind_key_in_map ('}', rl_insert_close, emacs_standard_keymap); | |
4a11f206 PP |
76 | |
77 | #if defined (VI_MODE) | |
78 | /* ([{ */ | |
79 | rl_bind_key_in_map (')', rl_insert_close, vi_insertion_keymap); | |
80 | rl_bind_key_in_map (']', rl_insert_close, vi_insertion_keymap); | |
81 | rl_bind_key_in_map ('}', rl_insert_close, vi_insertion_keymap); | |
82 | #endif | |
1b17e766 EZ |
83 | } |
84 | else | |
4a11f206 PP |
85 | { |
86 | /* ([{ */ | |
1b17e766 EZ |
87 | rl_bind_key_in_map (')', rl_insert, emacs_standard_keymap); |
88 | rl_bind_key_in_map (']', rl_insert, emacs_standard_keymap); | |
89 | rl_bind_key_in_map ('}', rl_insert, emacs_standard_keymap); | |
4a11f206 PP |
90 | |
91 | #if defined (VI_MODE) | |
92 | /* ([{ */ | |
93 | rl_bind_key_in_map (')', rl_insert, vi_insertion_keymap); | |
94 | rl_bind_key_in_map (']', rl_insert, vi_insertion_keymap); | |
95 | rl_bind_key_in_map ('}', rl_insert, vi_insertion_keymap); | |
96 | #endif | |
1b17e766 EZ |
97 | } |
98 | } | |
d60d9f65 | 99 | |
9255ee31 EZ |
100 | int |
101 | rl_set_paren_blink_timeout (u) | |
102 | int u; | |
103 | { | |
104 | int o; | |
105 | ||
106 | o = _paren_blink_usec; | |
107 | if (u > 0) | |
108 | _paren_blink_usec = u; | |
109 | return (o); | |
110 | } | |
111 | ||
d60d9f65 SS |
112 | int |
113 | rl_insert_close (count, invoking_key) | |
114 | int count, invoking_key; | |
115 | { | |
116 | if (rl_explicit_arg || !rl_blink_matching_paren) | |
9255ee31 | 117 | _rl_insert_char (count, invoking_key); |
d60d9f65 SS |
118 | else |
119 | { | |
120 | #if defined (HAVE_SELECT) | |
121 | int orig_point, match_point, ready; | |
122 | struct timeval timer; | |
123 | fd_set readfds; | |
124 | ||
9255ee31 | 125 | _rl_insert_char (1, invoking_key); |
d60d9f65 SS |
126 | (*rl_redisplay_function) (); |
127 | match_point = | |
128 | find_matching_open (rl_line_buffer, rl_point - 2, invoking_key); | |
129 | ||
130 | /* Emacs might message or ring the bell here, but I don't. */ | |
131 | if (match_point < 0) | |
4a11f206 | 132 | return 1; |
d60d9f65 SS |
133 | |
134 | FD_ZERO (&readfds); | |
135 | FD_SET (fileno (rl_instream), &readfds); | |
cc88a640 | 136 | USEC_TO_TIMEVAL (_paren_blink_usec, timer); |
d60d9f65 SS |
137 | |
138 | orig_point = rl_point; | |
139 | rl_point = match_point; | |
140 | (*rl_redisplay_function) (); | |
141 | ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer); | |
142 | rl_point = orig_point; | |
143 | #else /* !HAVE_SELECT */ | |
9255ee31 | 144 | _rl_insert_char (count, invoking_key); |
d60d9f65 SS |
145 | #endif /* !HAVE_SELECT */ |
146 | } | |
147 | return 0; | |
148 | } | |
149 | ||
150 | static int | |
151 | find_matching_open (string, from, closer) | |
152 | char *string; | |
153 | int from, closer; | |
154 | { | |
155 | register int i; | |
156 | int opener, level, delimiter; | |
157 | ||
158 | switch (closer) | |
159 | { | |
160 | case ']': opener = '['; break; | |
161 | case '}': opener = '{'; break; | |
162 | case ')': opener = '('; break; | |
163 | default: | |
164 | return (-1); | |
165 | } | |
166 | ||
167 | level = 1; /* The closer passed in counts as 1. */ | |
168 | delimiter = 0; /* Delimited state unknown. */ | |
169 | ||
170 | for (i = from; i > -1; i--) | |
171 | { | |
172 | if (delimiter && (string[i] == delimiter)) | |
173 | delimiter = 0; | |
174 | else if (rl_basic_quote_characters && strchr (rl_basic_quote_characters, string[i])) | |
175 | delimiter = string[i]; | |
176 | else if (!delimiter && (string[i] == closer)) | |
177 | level++; | |
178 | else if (!delimiter && (string[i] == opener)) | |
179 | level--; | |
180 | ||
181 | if (!level) | |
182 | break; | |
183 | } | |
184 | return (i); | |
185 | } |