blob: ea930b593cc2c363847af7b6ba4d130dc1df58f3 [file] [log] [blame]
/*
* Copyright (C) 2012-2016 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 "JSCInlines.h"
namespace JSC {
JSStringJoiner::~JSStringJoiner()
{
}
template<typename CharacterType>
static inline void appendStringToData(CharacterType*& data, StringView string)
{
string.getCharactersWithUpconvert(data);
data += string.length();
}
template<typename CharacterType>
static inline String joinStrings(const Vector<StringViewWithUnderlyingString>& strings, StringView separator, unsigned joinedLength)
{
ASSERT(joinedLength);
CharacterType* data;
String result = StringImpl::tryCreateUninitialized(joinedLength, data);
if (UNLIKELY(result.isNull()))
return result;
appendStringToData(data, strings[0].view);
unsigned size = strings.size();
switch (separator.length()) {
case 0:
for (unsigned i = 1; i < size; ++i)
appendStringToData(data, strings[i].view);
break;
case 1: {
CharacterType separatorCharacter = separator[0];
for (unsigned i = 1; i < size; ++i) {
*data++ = separatorCharacter;
appendStringToData(data, strings[i].view);
}
break;
}
default:
for (unsigned i = 1; i < size; ++i) {
appendStringToData(data, separator);
appendStringToData(data, strings[i].view);
}
}
ASSERT(data == result.characters<CharacterType>() + joinedLength);
return result;
}
inline unsigned JSStringJoiner::joinedLength(ExecState& state) const
{
VM& vm = state.vm();
auto scope = DECLARE_THROW_SCOPE(vm);
unsigned numberOfStrings = m_strings.size();
if (!numberOfStrings)
return 0;
Checked<int32_t, RecordOverflow> separatorLength = m_separator.length();
Checked<int32_t, RecordOverflow> totalSeparatorsLength = separatorLength * (numberOfStrings - 1);
Checked<int32_t, RecordOverflow> totalLength = totalSeparatorsLength + m_accumulatedStringsLength;
int32_t result;
if (totalLength.safeGet(result) == CheckedState::DidOverflow) {
throwOutOfMemoryError(&state, scope);
return 0;
}
return result;
}
JSValue JSStringJoiner::join(ExecState& state)
{
VM& vm = state.vm();
auto scope = DECLARE_THROW_SCOPE(vm);
ASSERT(m_strings.size() <= m_strings.capacity());
unsigned length = joinedLength(state);
RETURN_IF_EXCEPTION(scope, JSValue());
if (!length)
return jsEmptyString(&state);
String result;
if (m_isAll8Bit)
result = joinStrings<LChar>(m_strings, m_separator, length);
else
result = joinStrings<UChar>(m_strings, m_separator, length);
if (result.isNull())
return throwOutOfMemoryError(&state, scope);
return jsString(&state, WTFMove(result));
}
}