| 1 | /* parens.c -- Implemenation of matching parenthesis 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 | |
| 23 | #include <stdio.h> |
| 24 | #include <sys/types.h> |
| 25 | #include <sys/time.h> |
| 26 | #include "readline.h" |
| 27 | |
| 28 | /* Non-zero means try to blink the matching open parenthesis when the |
| 29 | close parenthesis is inserted. */ |
| 30 | #if defined (FD_SET) |
| 31 | int rl_blink_matching_paren = 1; |
| 32 | #else /* !FD_SET */ |
| 33 | int rl_blink_matching_paren = 0; |
| 34 | #endif /* !FD_SET */ |
| 35 | |
| 36 | static int find_matching_open (); |
| 37 | |
| 38 | rl_insert_close (count, invoking_key) |
| 39 | int count, invoking_key; |
| 40 | { |
| 41 | extern int rl_explicit_arg; |
| 42 | |
| 43 | if (rl_explicit_arg || !rl_blink_matching_paren) |
| 44 | rl_insert (count, invoking_key); |
| 45 | else |
| 46 | { |
| 47 | #if defined (FD_SET) |
| 48 | int orig_point, match_point, ready; |
| 49 | struct timeval timer; |
| 50 | fd_set readfds; |
| 51 | |
| 52 | rl_insert (1, invoking_key); |
| 53 | rl_redisplay (); |
| 54 | match_point = |
| 55 | find_matching_open (rl_line_buffer, rl_point - 2, invoking_key); |
| 56 | |
| 57 | /* Emacs might message or ring the bell here, but I don't. */ |
| 58 | if (match_point < 0) |
| 59 | return; |
| 60 | |
| 61 | FD_ZERO (&readfds); |
| 62 | FD_SET (fileno (rl_instream), &readfds); |
| 63 | timer.tv_sec = 1; |
| 64 | timer.tv_usec = 500; |
| 65 | |
| 66 | orig_point = rl_point; |
| 67 | rl_point = match_point; |
| 68 | rl_redisplay (); |
| 69 | ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer); |
| 70 | rl_point = orig_point; |
| 71 | #else /* !FD_SET */ |
| 72 | rl_insert (count, invoking_key); |
| 73 | #endif /* !FD_SET */ |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | static int |
| 78 | find_matching_open (string, from, closer) |
| 79 | char *string; |
| 80 | int from, closer; |
| 81 | { |
| 82 | register int i; |
| 83 | int opener, level, delimiter; |
| 84 | |
| 85 | switch (closer) |
| 86 | { |
| 87 | case ']': opener = '['; break; |
| 88 | case '}': opener = '{'; break; |
| 89 | case ')': opener = '('; break; |
| 90 | default: |
| 91 | return (-1); |
| 92 | } |
| 93 | |
| 94 | level = 1; /* The closer passed in counts as 1. */ |
| 95 | delimiter = 0; /* Delimited state unknown. */ |
| 96 | |
| 97 | for (i = from; i > -1; i--) |
| 98 | { |
| 99 | if (delimiter && (string[i] == delimiter)) |
| 100 | delimiter = 0; |
| 101 | else if ((string[i] == '\'') || (string[i] == '"')) |
| 102 | delimiter = rl_line_buffer[i]; |
| 103 | else if (!delimiter && (string[i] == closer)) |
| 104 | level++; |
| 105 | else if (!delimiter && (string[i] == opener)) |
| 106 | level--; |
| 107 | |
| 108 | if (!level) |
| 109 | break; |
| 110 | } |
| 111 | return (i); |
| 112 | } |
| 113 | |
| 114 | |
| 115 | |