summaryrefslogtreecommitdiff
path: root/readline/parens.c
diff options
context:
space:
mode:
Diffstat (limited to 'readline/parens.c')
-rw-r--r--readline/parens.c156
1 files changed, 156 insertions, 0 deletions
diff --git a/readline/parens.c b/readline/parens.c
new file mode 100644
index 00000000000..a500c0afac7
--- /dev/null
+++ b/readline/parens.c
@@ -0,0 +1,156 @@
+/* parens.c -- Implementation of matching parentheses feature. */
+
+/* Copyright (C) 1987, 1989, 1992 Free Software Foundation, Inc.
+
+ This file is part of the GNU Readline Library, a library for
+ reading lines of text with interactive input and history editing.
+
+ The GNU Readline Library is free software; you can redistribute it
+ and/or modify it under the terms of the GNU General Public License
+ as published by the Free Software Foundation; either version 1, or
+ (at your option) any later version.
+
+ The GNU Readline Library is distributed in the hope that it will be
+ useful, but WITHOUT ANY WARRANTY; without even the implied warranty
+ of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ The GNU General Public License is often shipped with GNU software, and
+ is generally kept in a file called COPYING or LICENSE. If you do not
+ have a copy of the license, write to the Free Software Foundation,
+ 675 Mass Ave, Cambridge, MA 02139, USA. */
+#define READLINE_LIBRARY
+
+#include "rlconf.h"
+
+#if !defined (PAREN_MATCHING)
+extern int rl_insert ();
+
+int
+rl_insert_close (count, invoking_key)
+ int count, invoking_key;
+{
+ return (rl_insert (count, invoking_key));
+}
+
+#else /* PAREN_MATCHING */
+
+#if defined (HAVE_CONFIG_H)
+# include <config.h>
+#endif
+
+#include <stdio.h>
+#include <sys/types.h>
+
+#if defined (FD_SET) && !defined (HAVE_SELECT)
+# define HAVE_SELECT
+#endif
+
+#if defined (HAVE_SELECT)
+# include <sys/time.h>
+#endif /* HAVE_SELECT */
+#if defined (HAVE_SYS_SELECT_H)
+# include <sys/select.h>
+#endif
+
+#if defined (HAVE_STRING_H)
+# include <string.h>
+#else /* !HAVE_STRING_H */
+# include <strings.h>
+#endif /* !HAVE_STRING_H */
+
+#if !defined (strchr) && !defined (__STDC__)
+extern char *strchr (), *strrchr ();
+#endif /* !strchr && !__STDC__ */
+
+#include "readline.h"
+
+extern int rl_explicit_arg;
+
+/* Non-zero means try to blink the matching open parenthesis when the
+ close parenthesis is inserted. */
+#if defined (HAVE_SELECT)
+int rl_blink_matching_paren = 1;
+#else /* !HAVE_SELECT */
+int rl_blink_matching_paren = 0;
+#endif /* !HAVE_SELECT */
+
+static int find_matching_open ();
+
+int
+rl_insert_close (count, invoking_key)
+ int count, invoking_key;
+{
+ if (rl_explicit_arg || !rl_blink_matching_paren)
+ rl_insert (count, invoking_key);
+ else
+ {
+#if defined (HAVE_SELECT)
+ int orig_point, match_point, ready;
+ struct timeval timer;
+ fd_set readfds;
+
+ rl_insert (1, invoking_key);
+ (*rl_redisplay_function) ();
+ match_point =
+ find_matching_open (rl_line_buffer, rl_point - 2, invoking_key);
+
+ /* Emacs might message or ring the bell here, but I don't. */
+ if (match_point < 0)
+ return -1;
+
+ FD_ZERO (&readfds);
+ FD_SET (fileno (rl_instream), &readfds);
+ timer.tv_sec = 0;
+ timer.tv_usec = 500000;
+
+ orig_point = rl_point;
+ rl_point = match_point;
+ (*rl_redisplay_function) ();
+ ready = select (1, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timer);
+ rl_point = orig_point;
+#else /* !HAVE_SELECT */
+ rl_insert (count, invoking_key);
+#endif /* !HAVE_SELECT */
+ }
+ return 0;
+}
+
+static int
+find_matching_open (string, from, closer)
+ char *string;
+ int from, closer;
+{
+ register int i;
+ int opener, level, delimiter;
+
+ switch (closer)
+ {
+ case ']': opener = '['; break;
+ case '}': opener = '{'; break;
+ case ')': opener = '('; break;
+ default:
+ return (-1);
+ }
+
+ level = 1; /* The closer passed in counts as 1. */
+ delimiter = 0; /* Delimited state unknown. */
+
+ for (i = from; i > -1; i--)
+ {
+ if (delimiter && (string[i] == delimiter))
+ delimiter = 0;
+ else if (rl_basic_quote_characters && strchr (rl_basic_quote_characters, string[i]))
+ delimiter = string[i];
+ else if (!delimiter && (string[i] == closer))
+ level++;
+ else if (!delimiter && (string[i] == opener))
+ level--;
+
+ if (!level)
+ break;
+ }
+ return (i);
+}
+
+#endif /* PAREN_MATCHING */