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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 | |
10 | as published by the Free Software Foundation; either version 1, or | |
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, | |
21 | 675 Mass Ave, Cambridge, MA 02139, USA. */ | |
22 | #define READLINE_LIBRARY | |
23 | ||
24 | #include "rlconf.h" | |
25 | ||
26 | #if !defined (PAREN_MATCHING) | |
27 | extern int rl_insert (); | |
28 | ||
29 | int | |
30 | rl_insert_close (count, invoking_key) | |
31 | int count, invoking_key; | |
32 | { | |
33 | return (rl_insert (count, invoking_key)); | |
34 | } | |
35 | ||
36 | #else /* PAREN_MATCHING */ | |
37 | ||
38 | #if defined (HAVE_CONFIG_H) | |
39 | # include <config.h> | |
40 | #endif | |
41 | ||
42 | #include <stdio.h> | |
43 | #include <sys/types.h> | |
44 | ||
45 | #if defined (FD_SET) && !defined (HAVE_SELECT) | |
46 | # define HAVE_SELECT | |
47 | #endif | |
48 | ||
49 | #if defined (HAVE_SELECT) | |
50 | # include <sys/time.h> | |
51 | #endif /* HAVE_SELECT */ | |
52 | #if defined (HAVE_SYS_SELECT_H) | |
53 | # include <sys/select.h> | |
54 | #endif | |
55 | ||
56 | #if defined (HAVE_STRING_H) | |
57 | # include <string.h> | |
58 | #else /* !HAVE_STRING_H */ | |
59 | # include <strings.h> | |
60 | #endif /* !HAVE_STRING_H */ | |
61 | ||
62 | #if !defined (strchr) && !defined (__STDC__) | |
63 | extern char *strchr (), *strrchr (); | |
64 | #endif /* !strchr && !__STDC__ */ | |
65 | ||
66 | #include "readline.h" | |
67 | ||
68 | extern int rl_explicit_arg; | |
69 | ||
70 | /* Non-zero means try to blink the matching open parenthesis when the | |
71 | close parenthesis is inserted. */ | |
72 | #if defined (HAVE_SELECT) | |
73 | int rl_blink_matching_paren = 1; | |
74 | #else /* !HAVE_SELECT */ | |
75 | int rl_blink_matching_paren = 0; | |
76 | #endif /* !HAVE_SELECT */ | |
77 | ||
78 | static int find_matching_open (); | |
79 | ||
80 | int | |
81 | rl_insert_close (count, invoking_key) | |
82 | int count, invoking_key; | |
83 | { | |
84 | if (rl_explicit_arg || !rl_blink_matching_paren) | |
85 | rl_insert (count, invoking_key); | |
86 | else | |
87 | { | |
88 | #if defined (HAVE_SELECT) | |
89 | int orig_point, match_point, ready; | |
90 | struct timeval timer; | |
91 | fd_set readfds; | |
92 | ||
93 | rl_insert (1, invoking_key); | |
94 | (*rl_redisplay_function) (); | |
95 | match_point = | |
96 | find_matching_open (rl_line_buffer, rl_point - 2, invoking_key); | |
97 | ||
98 | /* Emacs might message or ring the bell here, but I don't. */ | |
99 | if (match_point < 0) | |
100 | return -1; | |
101 | ||
102 | FD_ZERO (&readfds); | |
103 | FD_SET (fileno (rl_instream), &readfds); | |
104 | timer.tv_sec = 0; | |
105 | timer.tv_usec = 500000; | |
106 | ||
107 | orig_point = rl_point; | |
108 | rl_point = match_point; | |
109 | (*rl_redisplay_function) (); | |
110 | ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer); | |
111 | rl_point = orig_point; | |
112 | #else /* !HAVE_SELECT */ | |
113 | rl_insert (count, invoking_key); | |
114 | #endif /* !HAVE_SELECT */ | |
115 | } | |
116 | return 0; | |
117 | } | |
118 | ||
119 | static int | |
120 | find_matching_open (string, from, closer) | |
121 | char *string; | |
122 | int from, closer; | |
123 | { | |
124 | register int i; | |
125 | int opener, level, delimiter; | |
126 | ||
127 | switch (closer) | |
128 | { | |
129 | case ']': opener = '['; break; | |
130 | case '}': opener = '{'; break; | |
131 | case ')': opener = '('; break; | |
132 | default: | |
133 | return (-1); | |
134 | } | |
135 | ||
136 | level = 1; /* The closer passed in counts as 1. */ | |
137 | delimiter = 0; /* Delimited state unknown. */ | |
138 | ||
139 | for (i = from; i > -1; i--) | |
140 | { | |
141 | if (delimiter && (string[i] == delimiter)) | |
142 | delimiter = 0; | |
143 | else if (rl_basic_quote_characters && strchr (rl_basic_quote_characters, string[i])) | |
144 | delimiter = string[i]; | |
145 | else if (!delimiter && (string[i] == closer)) | |
146 | level++; | |
147 | else if (!delimiter && (string[i] == opener)) | |
148 | level--; | |
149 | ||
150 | if (!level) | |
151 | break; | |
152 | } | |
153 | return (i); | |
154 | } | |
155 | ||
156 | #endif /* PAREN_MATCHING */ |