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comparison src/widget.c @ 428:3ecd8885ac67 r21-2-22

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Import from CVS: tag r21-2-22
author cvs
date Mon, 13 Aug 2007 11:28:15 +0200
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children 9d177e8d4150
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427:0a0253eac470 428:3ecd8885ac67
1 /* Primitives for work of the "widget" library.
2 Copyright (C) 1997 Free Software Foundation, Inc.
3
4 This file is part of XEmacs.
5
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
9 later version.
10
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
14 for more details.
15
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. */
20
21 /* Synched up with: Not in FSF. */
22
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. */
28
29 #include <config.h>
30 #include "lisp.h"
31 #include "buffer.h"
32
33
34 Lisp_Object Qwidget_type;
35
36
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.
39 */
40 (plist, prop))
41 {
42 while (!NILP (plist) && !EQ (Fcar (plist), prop))
43 {
44 /* Check for QUIT, so a circular plist doesn't lock up the
45 editor. */
46 QUIT;
47 plist = Fcdr (Fcdr (plist));
48 }
49 return plist;
50 }
51
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'.
55 */
56 (widget, property, value))
57 {
58 CHECK_CONS (widget);
59 XCDR (widget) = Fplist_put (XCDR (widget), property, value);
60 return widget;
61 }
62
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'.
67 */
68 (widget, property))
69 {
70 Lisp_Object value = Qnil;
71
72 while (1)
73 {
74 Lisp_Object tmp = Fwidget_plist_member (Fcdr (widget), property);
75 if (!NILP (tmp))
76 {
77 value = Fcar (Fcdr (tmp));
78 break;
79 }
80 tmp = Fcar (widget);
81 if (!NILP (tmp))
82 {
83 widget = Fget (tmp, Qwidget_type, Qnil);
84 continue;
85 }
86 break;
87 }
88 return value;
89 }
90
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.
94 */
95 (int nargs, Lisp_Object *args))
96 {
97 /* This function can GC */
98 Lisp_Object newargs[3];
99 struct gcpro gcpro1;
100
101 newargs[0] = Fwidget_get (args[0], args[1]);
102 newargs[1] = args[0];
103 newargs[2] = Flist (nargs - 2, args + 2);
104 GCPRO1 ((newargs[2]));
105 RETURN_UNGCPRO (Fapply (3, newargs));
106 }
107
108 void
109 syms_of_widget (void)
110 {
111 defsymbol (&Qwidget_type, "widget-type");
112
113 DEFSUBR (Fwidget_plist_member);
114 DEFSUBR (Fwidget_put);
115 DEFSUBR (Fwidget_get);
116 DEFSUBR (Fwidget_apply);
117 }