Annotation of embedaddon/readline/parens.c, revision 1.1.1.1
1.1 misho 1: /* parens.c -- implementation of matching parentheses feature. */
2:
3: /* Copyright (C) 1987, 1989, 1992-2009 Free Software Foundation, Inc.
4:
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.
7:
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
11: (at your option) any later version.
12:
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
16: GNU General Public License for more details.
17:
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:
22: #define READLINE_LIBRARY
23:
24: #if defined (__TANDEM)
25: # include <floss.h>
26: #endif
27:
28: #include "rlconf.h"
29:
30: #if defined (HAVE_CONFIG_H)
31: # include <config.h>
32: #endif
33:
34: #include <stdio.h>
35: #include <sys/types.h>
36:
37: #if defined (HAVE_UNISTD_H)
38: # include <unistd.h>
39: #endif
40:
41: #include "posixselect.h"
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"
54: #include "rlprivate.h"
55:
56: static int find_matching_open PARAMS((char *, int, int));
57:
58: /* Non-zero means try to blink the matching open parenthesis when the
59: close parenthesis is inserted. */
60: #if defined (HAVE_SELECT)
61: int rl_blink_matching_paren = 1;
62: #else /* !HAVE_SELECT */
63: int rl_blink_matching_paren = 0;
64: #endif /* !HAVE_SELECT */
65:
66: static int _paren_blink_usec = 500000;
67:
68: /* Change emacs_standard_keymap to have bindings for paren matching when
69: ON_OR_OFF is 1, change them back to self_insert when ON_OR_OFF == 0. */
70: void
71: _rl_enable_paren_matching (on_or_off)
72: int on_or_off;
73: {
74: if (on_or_off)
75: { /* ([{ */
76: rl_bind_key_in_map (')', rl_insert_close, emacs_standard_keymap);
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: }
80: else
81: { /* ([{ */
82: rl_bind_key_in_map (')', rl_insert, 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: }
86: }
87:
88: int
89: rl_set_paren_blink_timeout (u)
90: int u;
91: {
92: int o;
93:
94: o = _paren_blink_usec;
95: if (u > 0)
96: _paren_blink_usec = u;
97: return (o);
98: }
99:
100: int
101: rl_insert_close (count, invoking_key)
102: int count, invoking_key;
103: {
104: if (rl_explicit_arg || !rl_blink_matching_paren)
105: _rl_insert_char (count, invoking_key);
106: else
107: {
108: #if defined (HAVE_SELECT)
109: int orig_point, match_point, ready;
110: struct timeval timer;
111: fd_set readfds;
112:
113: _rl_insert_char (1, invoking_key);
114: (*rl_redisplay_function) ();
115: match_point =
116: find_matching_open (rl_line_buffer, rl_point - 2, invoking_key);
117:
118: /* Emacs might message or ring the bell here, but I don't. */
119: if (match_point < 0)
120: return -1;
121:
122: FD_ZERO (&readfds);
123: FD_SET (fileno (rl_instream), &readfds);
124: USEC_TO_TIMEVAL (_paren_blink_usec, timer);
125:
126: orig_point = rl_point;
127: rl_point = match_point;
128: (*rl_redisplay_function) ();
129: ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer);
130: rl_point = orig_point;
131: #else /* !HAVE_SELECT */
132: _rl_insert_char (count, invoking_key);
133: #endif /* !HAVE_SELECT */
134: }
135: return 0;
136: }
137:
138: static int
139: find_matching_open (string, from, closer)
140: char *string;
141: int from, closer;
142: {
143: register int i;
144: int opener, level, delimiter;
145:
146: switch (closer)
147: {
148: case ']': opener = '['; break;
149: case '}': opener = '{'; break;
150: case ')': opener = '('; break;
151: default:
152: return (-1);
153: }
154:
155: level = 1; /* The closer passed in counts as 1. */
156: delimiter = 0; /* Delimited state unknown. */
157:
158: for (i = from; i > -1; i--)
159: {
160: if (delimiter && (string[i] == delimiter))
161: delimiter = 0;
162: else if (rl_basic_quote_characters && strchr (rl_basic_quote_characters, string[i]))
163: delimiter = string[i];
164: else if (!delimiter && (string[i] == closer))
165: level++;
166: else if (!delimiter && (string[i] == opener))
167: level--;
168:
169: if (!level)
170: break;
171: }
172: return (i);
173: }
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