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/*
* Copyright (C) 2012, 2013 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.
*/
#include "config.h"
#include "JSStringJoiner.h"
#include "ExceptionHelpers.h"
#include "JSScope.h"
#include "JSString.h"
#include "Operations.h"
#include <wtf/text/StringImpl.h>
namespace JSC {
// The destination is 16bits, at least one string is 16 bits.
static inline void appendStringToData(UChar*& data, const String& string)
{
if (string.isNull())
return;
unsigned length = string.length();
const StringImpl* stringImpl = string.impl();
if (stringImpl->is8Bit()) {
for (unsigned i = 0; i < length; ++i) {
*data = stringImpl->characters8()[i];
++data;
}
} else {
for (unsigned i = 0; i < length; ++i) {
*data = stringImpl->characters16()[i];
++data;
}
}
}
// If the destination is 8bits, we know every string has to be 8bit.
static inline void appendStringToData(LChar*& data, const String& string)
{
if (string.isNull())
return;
ASSERT(string.is8Bit());
unsigned length = string.length();
const StringImpl* stringImpl = string.impl();
for (unsigned i = 0; i < length; ++i) {
*data = stringImpl->characters8()[i];
++data;
}
}
template<typename CharacterType>
static inline PassRefPtr<StringImpl> joinStrings(const Vector<String>& strings, const String& separator, unsigned outputLength)
{
ASSERT(outputLength);
CharacterType* data;
RefPtr<StringImpl> outputStringImpl = StringImpl::tryCreateUninitialized(outputLength, data);
if (!outputStringImpl)
return PassRefPtr<StringImpl>();
const String firstString = strings.first();
appendStringToData(data, firstString);
for (size_t i = 1; i < strings.size(); ++i) {
appendStringToData(data, separator);
appendStringToData(data, strings[i]);
}
ASSERT(data == (outputStringImpl->getCharacters<CharacterType>() + outputStringImpl->length()));
return outputStringImpl.release();
}
JSValue JSStringJoiner::join(ExecState* exec)
{
if (!m_isValid)
return throwOutOfMemoryError(exec);
if (!m_strings.size())
return jsEmptyString(exec);
Checked<size_t, RecordOverflow> separatorLength = m_separator.length();
// FIXME: add special cases of joinStrings() for (separatorLength == 0) and (separatorLength == 1).
ASSERT(m_strings.size() > 0);
Checked<size_t, RecordOverflow> totalSeparactorsLength = separatorLength * (m_strings.size() - 1);
Checked<size_t, RecordOverflow> outputStringSize = totalSeparactorsLength + m_accumulatedStringsLength;
size_t finalSize;
if (outputStringSize.safeGet(finalSize) == CheckedState::DidOverflow)
return throwOutOfMemoryError(exec);
if (!outputStringSize)
return jsEmptyString(exec);
RefPtr<StringImpl> outputStringImpl;
if (m_is8Bits)
outputStringImpl = joinStrings<LChar>(m_strings, m_separator, finalSize);
else
outputStringImpl = joinStrings<UChar>(m_strings, m_separator, finalSize);
if (!outputStringImpl)
return throwOutOfMemoryError(exec);
return JSString::create(exec->vm(), outputStringImpl.release());
}
}
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