1/*
2 * Copyright (C) 2010 University of Szeged
3 * Copyright (C) 2010 Renata Hodovan (hodovan@inf.u-szeged.hu)
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 *    notice, this list of conditions and the following disclaimer.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 *    notice, this list of conditions and the following disclaimer in the
13 *    documentation and/or other materials provided with the distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
16 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
18 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
19 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
20 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
21 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
22 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
23 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
25 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26 */
27
28#include "config.h"
29
30#include "RegExpCache.h"
31
32namespace JSC {
33
34PassRefPtr<RegExp> RegExpCache::lookupOrCreate(const UString& patternString, RegExpFlags flags)
35{
36    if (patternString.length() < maxCacheablePatternLength) {
37        pair<RegExpCacheMap::iterator, bool> result = m_cacheMap.add(RegExpKey(flags, patternString), 0);
38        if (!result.second)
39            return result.first->second;
40        else
41            return create(patternString, flags, result.first);
42    }
43    return create(patternString, flags, m_cacheMap.end());
44}
45
46PassRefPtr<RegExp> RegExpCache::create(const UString& patternString, RegExpFlags flags, RegExpCacheMap::iterator iterator)
47{
48    RefPtr<RegExp> regExp = RegExp::create(m_globalData, patternString, flags);
49
50    if (patternString.length() >= maxCacheablePatternLength)
51        return regExp;
52
53    RegExpKey key = RegExpKey(flags, patternString);
54    iterator->first = key;
55    iterator->second = regExp;
56
57    ++m_nextKeyToEvict;
58    if (m_nextKeyToEvict == maxCacheableEntries) {
59        m_nextKeyToEvict = 0;
60        m_isFull = true;
61    }
62    if (m_isFull)
63        m_cacheMap.remove(RegExpKey(patternKeyArray[m_nextKeyToEvict].flagsValue, patternKeyArray[m_nextKeyToEvict].pattern));
64
65    patternKeyArray[m_nextKeyToEvict].flagsValue = key.flagsValue;
66    patternKeyArray[m_nextKeyToEvict].pattern = patternString.impl();
67    return regExp;
68}
69
70RegExpCache::RegExpCache(JSGlobalData* globalData)
71    : m_globalData(globalData)
72    , m_nextKeyToEvict(-1)
73    , m_isFull(false)
74{
75}
76
77}
78