1/*
2 * Copyright (C) 2008 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#ifndef OpaqueJSString_h
27#define OpaqueJSString_h
28
29#include <atomic>
30#include <wtf/ThreadSafeRefCounted.h>
31#include <wtf/text/WTFString.h>
32
33namespace JSC {
34 class Identifier;
35 class VM;
36}
37
38struct OpaqueJSString : public ThreadSafeRefCounted<OpaqueJSString> {
39 static Ref<OpaqueJSString> create()
40 {
41 return adoptRef(*new OpaqueJSString);
42 }
43
44 static Ref<OpaqueJSString> create(const LChar* characters, unsigned length)
45 {
46 return adoptRef(*new OpaqueJSString(characters, length));
47 }
48
49 static Ref<OpaqueJSString> create(const UChar* characters, unsigned length)
50 {
51 return adoptRef(*new OpaqueJSString(characters, length));
52 }
53
54 JS_EXPORT_PRIVATE static RefPtr<OpaqueJSString> create(const String&);
55
56 JS_EXPORT_PRIVATE ~OpaqueJSString();
57
58 bool is8Bit() { return m_string.is8Bit(); }
59 const LChar* characters8() { return m_string.characters8(); }
60 const UChar* characters16() { return m_string.characters16(); }
61 unsigned length() { return m_string.length(); }
62
63 const UChar* characters();
64
65 JS_EXPORT_PRIVATE String string() const;
66 JSC::Identifier identifier(JSC::VM*) const;
67#if PLATFORM(QT)
68 QString qString() const { return m_string; }
69#endif
70
71 static bool equal(const OpaqueJSString*, const OpaqueJSString*);
72
73private:
74 friend class WTF::ThreadSafeRefCounted<OpaqueJSString>;
75
76 OpaqueJSString()
77 : m_characters(nullptr)
78 {
79 }
80
81 OpaqueJSString(const String& string)
82 : m_string(string.isolatedCopy())
83 , m_characters(m_string.impl() && m_string.is8Bit() ? nullptr : const_cast<UChar*>(m_string.characters16()))
84 {
85 }
86
87 OpaqueJSString(const LChar* characters, unsigned length)
88 : m_string(characters, length)
89 , m_characters(nullptr)
90 {
91 }
92
93 OpaqueJSString(const UChar* characters, unsigned length)
94 : m_string(characters, length)
95 , m_characters(m_string.impl() && m_string.is8Bit() ? nullptr : const_cast<UChar*>(m_string.characters16()))
96 {
97 }
98
99 String m_string;
100
101 // This will be initialized on demand when characters() is called if the string needs up-conversion.
102 std::atomic<UChar*> m_characters;
103};
104
105#endif
106