1/*
2 * Copyright (C) 2012, 2013 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 JSStringJoiner_h
27#define JSStringJoiner_h
28
29#include "JSCJSValue.h"
30#include <wtf/Vector.h>
31#include <wtf/text/WTFString.h>
32
33namespace JSC {
34
35class ExecState;
36
37
38class JSStringJoiner {
39public:
40    JSStringJoiner(const String& separator, size_t stringCount);
41
42    void append(const String&);
43    JSValue join(ExecState*);
44
45private:
46    String m_separator;
47    Vector<String> m_strings;
48
49    Checked<unsigned, RecordOverflow> m_accumulatedStringsLength;
50    bool m_isValid;
51    bool m_is8Bits;
52};
53
54inline JSStringJoiner::JSStringJoiner(const String& separator, size_t stringCount)
55    : m_separator(separator)
56    , m_isValid(true)
57    , m_is8Bits(m_separator.is8Bit())
58{
59    ASSERT(!m_separator.isNull());
60    m_isValid = m_strings.tryReserveCapacity(stringCount);
61}
62
63inline void JSStringJoiner::append(const String& str)
64{
65    if (!m_isValid)
66        return;
67
68    m_strings.append(str);
69    if (!str.isNull()) {
70        m_accumulatedStringsLength += str.length();
71        m_is8Bits = m_is8Bits && str.is8Bit();
72    }
73}
74
75}
76
77#endif
78