| /* |
| * Copyright (C) 2009 Apple Inc. All Rights Reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY |
| * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY |
| * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #ifndef NumericStrings_h |
| #define NumericStrings_h |
| |
| #include "UString.h" |
| #include <wtf/HashFunctions.h> |
| |
| namespace JSC { |
| |
| class NumericStrings { |
| public: |
| UString add(double d) |
| { |
| CacheEntry<double>& entry = lookup(d); |
| if (d == entry.key && !entry.value.isNull()) |
| return entry.value; |
| entry.key = d; |
| entry.value = UString::from(d); |
| return entry.value; |
| } |
| |
| UString add(int i) |
| { |
| CacheEntry<int>& entry = lookup(i); |
| if (i == entry.key && !entry.value.isNull()) |
| return entry.value; |
| entry.key = i; |
| entry.value = UString::from(i); |
| return entry.value; |
| } |
| |
| private: |
| static const size_t cacheSize = 64; |
| |
| template<typename T> |
| struct CacheEntry { |
| T key; |
| UString value; |
| }; |
| |
| CacheEntry<double>& lookup(double d) { return doubleCache[WTF::FloatHash<double>::hash(d) & (cacheSize - 1)]; } |
| CacheEntry<int>& lookup(int i) { return intCache[WTF::IntHash<int>::hash(i) & (cacheSize - 1)]; } |
| |
| CacheEntry<double> doubleCache[cacheSize]; |
| CacheEntry<int> intCache[cacheSize]; |
| }; |
| |
| } // namespace JSC |
| |
| #endif // NumericStrings_h |
