2 * Copyright (C) 2009 Apple Inc. All Rights Reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
26 #ifndef NumericStrings_h
27 #define NumericStrings_h
30 #include <wtf/FixedArray.h>
31 #include <wtf/HashFunctions.h>
35 class NumericStrings {
39 CacheEntry<double>& entry = lookup(d);
40 if (d == entry.key && !entry.value.isNull())
43 entry.value = UString::number(d);
49 if (static_cast<unsigned>(i) < cacheSize)
50 return lookupSmallString(static_cast<unsigned>(i));
51 CacheEntry<int>& entry = lookup(i);
52 if (i == entry.key && !entry.value.isNull())
55 entry.value = UString::number(i);
59 UString add(unsigned i)
62 return lookupSmallString(static_cast<unsigned>(i));
63 CacheEntry<unsigned>& entry = lookup(i);
64 if (i == entry.key && !entry.value.isNull())
67 entry.value = UString::number(i);
71 static const size_t cacheSize = 64;
79 CacheEntry<double>& lookup(double d) { return doubleCache[WTF::FloatHash<double>::hash(d) & (cacheSize - 1)]; }
80 CacheEntry<int>& lookup(int i) { return intCache[WTF::IntHash<int>::hash(i) & (cacheSize - 1)]; }
81 CacheEntry<unsigned>& lookup(unsigned i) { return unsignedCache[WTF::IntHash<unsigned>::hash(i) & (cacheSize - 1)]; }
82 const UString& lookupSmallString(unsigned i)
84 ASSERT(i < cacheSize);
85 if (smallIntCache[i].isNull())
86 smallIntCache[i] = UString::number(i);
87 return smallIntCache[i];
90 FixedArray<CacheEntry<double>, cacheSize> doubleCache;
91 FixedArray<CacheEntry<int>, cacheSize> intCache;
92 FixedArray<CacheEntry<unsigned>, cacheSize> unsignedCache;
93 FixedArray<UString, cacheSize> smallIntCache;
98 #endif // NumericStrings_h