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Contents of /trunk/js/jsbool.h

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Sat Sep 26 23:15:22 2009 UTC (9 years, 11 months ago) by siliconforks
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1 /* -*- Mode: C; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
2 *
3 * ***** BEGIN LICENSE BLOCK *****
4 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
5 *
6 * The contents of this file are subject to the Mozilla Public License Version
7 * 1.1 (the "License"); you may not use this file except in compliance with
8 * the License. You may obtain a copy of the License at
9 * http://www.mozilla.org/MPL/
10 *
11 * Software distributed under the License is distributed on an "AS IS" basis,
12 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
13 * for the specific language governing rights and limitations under the
14 * License.
15 *
16 * The Original Code is Mozilla Communicator client code, released
17 * March 31, 1998.
18 *
19 * The Initial Developer of the Original Code is
20 * Netscape Communications Corporation.
21 * Portions created by the Initial Developer are Copyright (C) 1998
22 * the Initial Developer. All Rights Reserved.
23 *
24 * Contributor(s):
25 *
26 * Alternatively, the contents of this file may be used under the terms of
27 * either of the GNU General Public License Version 2 or later (the "GPL"),
28 * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
29 * in which case the provisions of the GPL or the LGPL are applicable instead
30 * of those above. If you wish to allow use of your version of this file only
31 * under the terms of either the GPL or the LGPL, and not to allow others to
32 * use your version of this file under the terms of the MPL, indicate your
33 * decision by deleting the provisions above and replace them with the notice
34 * and other provisions required by the GPL or the LGPL. If you do not delete
35 * the provisions above, a recipient may use your version of this file under
36 * the terms of any one of the MPL, the GPL or the LGPL.
37 *
38 * ***** END LICENSE BLOCK ***** */
39
40 #ifndef jsbool_h___
41 #define jsbool_h___
42 /*
43 * JS boolean interface.
44 */
45
46 #include "jsapi.h"
47
48 JS_BEGIN_EXTERN_C
49
50 /*
51 * Pseudo-booleans, not visible to script but used internally by the engine.
52 *
53 * JSVAL_HOLE is a useful value for identifying a hole in an array. It's also
54 * used in the interpreter to represent "no exception pending". In general it
55 * can be used to represent "no value".
56 *
57 * A JSVAL_HOLE can be cheaply converted to undefined without affecting any
58 * other boolean (or pseudo boolean) by masking out JSVAL_HOLE_MASK.
59 *
60 * JSVAL_ARETURN is used to throw asynchronous return for generator.close().
61 *
62 * NB: PSEUDO_BOOLEAN_TO_JSVAL(2) is JSVAL_VOID (see jsapi.h).
63 */
64 #define JSVAL_HOLE_FLAG jsval(4 << JSVAL_TAGBITS)
65 #define JSVAL_HOLE (JSVAL_VOID | JSVAL_HOLE_FLAG)
66 #define JSVAL_ARETURN PSEUDO_BOOLEAN_TO_JSVAL(8)
67
68 static JS_ALWAYS_INLINE JSBool
69 JSVAL_TO_PUBLIC_PSEUDO_BOOLEAN(jsval v)
70 {
71 JS_ASSERT(v == JSVAL_TRUE || v == JSVAL_FALSE || v == JSVAL_VOID);
72 return JSVAL_TO_PSEUDO_BOOLEAN(v);
73 }
74
75 extern JSClass js_BooleanClass;
76
77 extern JSObject *
78 js_InitBooleanClass(JSContext *cx, JSObject *obj);
79
80 extern JSString *
81 js_BooleanToString(JSContext *cx, JSBool b);
82
83 extern JSBool
84 js_ValueToBoolean(jsval v);
85
86 JS_END_EXTERN_C
87
88 #endif /* jsbool_h___ */

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