164 lines
5.7 KiB
C++
164 lines
5.7 KiB
C++
/*
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* Copyright (C) 2004-2017 Apple Inc. All rights reserved.
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* Copyright (C) 2010 Patrick Gansterer <paroga@paroga.com>
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* Copyright (C) 2012 Google Inc. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*
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*/
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#include "config.h"
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#include <wtf/text/AtomString.h>
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#include <mutex>
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#include <wtf/text/IntegerToStringConversion.h>
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#include <wtf/dtoa.h>
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namespace WTF {
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template<AtomString::CaseConvertType type>
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ALWAYS_INLINE AtomString AtomString::convertASCIICase() const
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{
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StringImpl* impl = this->impl();
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if (UNLIKELY(!impl))
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return nullAtom();
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// Convert short strings without allocating a new StringImpl, since
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// there's a good chance these strings are already in the atom
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// string table and so no memory allocation will be required.
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unsigned length;
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const unsigned localBufferSize = 100;
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if (impl->is8Bit() && (length = impl->length()) <= localBufferSize) {
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const LChar* characters = impl->characters8();
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unsigned failingIndex;
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for (unsigned i = 0; i < length; ++i) {
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if (type == CaseConvertType::Lower ? UNLIKELY(isASCIIUpper(characters[i])) : LIKELY(isASCIILower(characters[i]))) {
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failingIndex = i;
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goto SlowPath;
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}
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}
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return *this;
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SlowPath:
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LChar localBuffer[localBufferSize];
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for (unsigned i = 0; i < failingIndex; ++i)
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localBuffer[i] = characters[i];
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for (unsigned i = failingIndex; i < length; ++i)
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localBuffer[i] = type == CaseConvertType::Lower ? toASCIILower(characters[i]) : toASCIIUpper(characters[i]);
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return AtomString(localBuffer, length);
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}
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Ref<StringImpl> convertedString = type == CaseConvertType::Lower ? impl->convertToASCIILowercase() : impl->convertToASCIIUppercase();
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if (LIKELY(convertedString.ptr() == impl))
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return *this;
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AtomString result;
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result.m_string = AtomStringImpl::add(convertedString.ptr());
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return result;
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}
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AtomString AtomString::convertToASCIILowercase() const
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{
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return convertASCIICase<CaseConvertType::Lower>();
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}
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AtomString AtomString::convertToASCIIUppercase() const
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{
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return convertASCIICase<CaseConvertType::Upper>();
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}
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AtomString AtomString::number(int number)
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{
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return numberToStringSigned<AtomString>(number);
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}
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AtomString AtomString::number(unsigned number)
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{
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return numberToStringUnsigned<AtomString>(number);
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}
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AtomString AtomString::number(unsigned long number)
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{
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return numberToStringUnsigned<AtomString>(number);
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}
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AtomString AtomString::number(unsigned long long number)
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{
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return numberToStringUnsigned<AtomString>(number);
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}
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AtomString AtomString::number(float number)
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{
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NumberToStringBuffer buffer;
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return numberToString(number, buffer);
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}
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AtomString AtomString::number(double number)
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{
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NumberToStringBuffer buffer;
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return numberToString(number, buffer);
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}
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AtomString AtomString::fromUTF8Internal(const char* start, const char* end)
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{
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ASSERT(start);
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// Caller needs to handle empty string.
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ASSERT(!end || end > start);
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ASSERT(end || start[0]);
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return AtomStringImpl::addUTF8(start, end ? end : start + std::strlen(start));
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}
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#ifndef NDEBUG
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void AtomString::show() const
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{
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m_string.show();
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}
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#endif
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WTF_EXPORT_PRIVATE LazyNeverDestroyed<const AtomString> nullAtomData;
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WTF_EXPORT_PRIVATE LazyNeverDestroyed<const AtomString> emptyAtomData;
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WTF_EXPORT_PRIVATE MainThreadLazyNeverDestroyed<const AtomString> starAtomData;
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WTF_EXPORT_PRIVATE MainThreadLazyNeverDestroyed<const AtomString> xmlAtomData;
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WTF_EXPORT_PRIVATE MainThreadLazyNeverDestroyed<const AtomString> xmlnsAtomData;
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void AtomString::init()
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{
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static std::once_flag initializeKey;
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std::call_once(initializeKey, [] {
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// Initialization is not thread safe, so this function must be called from the main thread first.
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ASSERT(isUIThread());
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nullAtomData.construct();
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emptyAtomData.construct("");
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// When starting WebThread via StartWebThread function, we have special period between the prologue of StartWebThread and spawning WebThread actually.
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// In this period, `isMainThread()` returns false even if this is called on the main thread since WebThread is now enabled and we are not taking a WebThread lock.
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// This causes assertion hits in MainThreadLazyNeverDestroyed initialization only in WebThread platforms.
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// We bypass this by using constructWithoutAccessCheck, which intentionally skips `isMainThread()` check for construction.
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// In non WebThread environment, we do not lose the assertion coverage since we already have ASSERT(isUIThread()). And ASSERT(isUIThread()) ensures that this
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// is called in system main thread in WebThread platforms.
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starAtomData.constructWithoutAccessCheck("*", AtomString::ConstructFromLiteral);
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xmlAtomData.constructWithoutAccessCheck("xml", AtomString::ConstructFromLiteral);
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xmlnsAtomData.constructWithoutAccessCheck("xmlns", AtomString::ConstructFromLiteral);
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});
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}
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} // namespace WTF
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