1 /* Primitives for work of the "widget" library.
2 Copyright (C) 1997 Free Software Foundation, Inc.
4 This file is part of XEmacs.
6 XEmacs is free software; you can redistribute it and/or modify it
7 under the terms of the GNU General Public License as published by the
8 Free Software Foundation; either version 2, or (at your option) any
11 XEmacs is distributed in the hope that it will be useful, but WITHOUT
12 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with XEmacs; see the file COPYING. If not, write to
18 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
19 Boston, MA 02111-1307, USA. */
21 /* Synched up with: Not in FSF. */
23 /* In an ideal world, this file would not have been necessary.
24 However, elisp function calls being as slow as they are, it turns
25 out that some functions in the widget library (wid-edit.el) are the
26 bottleneck of Widget operation. Here is their translation to C,
27 for the sole reason of efficiency. */
34 Lisp_Object Qwidget_type;
37 DEFUN ("widget-plist-member", Fwidget_plist_member, 2, 2, 0, /*
38 Like `plist-get', but returns the tail of PLIST whose car is PROP.
42 while (!NILP (plist) && !EQ (Fcar (plist), prop))
44 /* Check for QUIT, so a circular plist doesn't lock up the
47 plist = Fcdr (Fcdr (plist));
52 DEFUN ("widget-put", Fwidget_put, 3, 3, 0, /*
53 In WIDGET set PROPERTY to VALUE.
54 The value can later be retrieved with `widget-get'.
56 (widget, property, value))
59 XCDR (widget) = Fplist_put (XCDR (widget), property, value);
63 DEFUN ("widget-get", Fwidget_get, 2, 2, 0, /*
64 In WIDGET, get the value of PROPERTY.
65 The value could either be specified when the widget was created, or
66 later with `widget-put'.
70 Lisp_Object value = Qnil;
74 Lisp_Object tmp = Fwidget_plist_member (Fcdr (widget), property);
77 value = Fcar (Fcdr (tmp));
83 widget = Fget (tmp, Qwidget_type, Qnil);
91 DEFUN ("widget-apply", Fwidget_apply, 2, MANY, 0, /*
92 Apply the value of WIDGET's PROPERTY to the widget itself.
93 ARGS are passed as extra arguments to the function.
95 (int nargs, Lisp_Object *args))
97 /* This function can GC */
98 Lisp_Object newargs[3];
101 newargs[0] = Fwidget_get (args[0], args[1]);
102 newargs[1] = args[0];
103 newargs[2] = Flist (nargs - 2, args + 2);
105 RETURN_UNGCPRO (Fapply (3, newargs));
109 syms_of_widget (void)
111 defsymbol (&Qwidget_type, "widget-type");
113 DEFSUBR (Fwidget_plist_member);
114 DEFSUBR (Fwidget_put);
115 DEFSUBR (Fwidget_get);
116 DEFSUBR (Fwidget_apply);