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Diffstat (limited to 'src/3rdparty/javascriptcore/JavaScriptCore/runtime/NumericStrings.h')
-rw-r--r-- | src/3rdparty/javascriptcore/JavaScriptCore/runtime/NumericStrings.h | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/3rdparty/javascriptcore/JavaScriptCore/runtime/NumericStrings.h b/src/3rdparty/javascriptcore/JavaScriptCore/runtime/NumericStrings.h new file mode 100644 index 0000000000..c0696a479a --- /dev/null +++ b/src/3rdparty/javascriptcore/JavaScriptCore/runtime/NumericStrings.h @@ -0,0 +1,74 @@ +/* + * 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 |