1/*
2 * Copyright (C) 2009 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 NumericStrings_h
27#define NumericStrings_h
28
29#include "UString.h"
30#include <wtf/HashFunctions.h>
31
32namespace JSC {
33
34 class NumericStrings {
35 public:
36 UString add(double d)
37 {
38 CacheEntry<double>& entry = lookup(d);
39 if (d == entry.key && !entry.value.isNull())
40 return entry.value;
41 entry.key = d;
42 entry.value = UString::from(d);
43 return entry.value;
44 }
45
46 UString add(int i)
47 {
48 CacheEntry<int>& entry = lookup(i);
49 if (i == entry.key && !entry.value.isNull())
50 return entry.value;
51 entry.key = i;
52 entry.value = UString::from(i);
53 return entry.value;
54 }
55
56 private:
57 static const size_t cacheSize = 64;
58
59 template<typename T>
60 struct CacheEntry {
61 T key;
62 UString value;
63 };
64
65 CacheEntry<double>& lookup(double d) { return doubleCache[WTF::FloatHash<double>::hash(key: d) & (cacheSize - 1)]; }
66 CacheEntry<int>& lookup(int i) { return intCache[WTF::IntHash<int>::hash(key: i) & (cacheSize - 1)]; }
67
68 CacheEntry<double> doubleCache[cacheSize];
69 CacheEntry<int> intCache[cacheSize];
70 };
71
72} // namespace JSC
73
74#endif // NumericStrings_h
75

source code of qtscript/src/3rdparty/javascriptcore/JavaScriptCore/runtime/NumericStrings.h