mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
synced 2024-11-23 04:09:40 +00:00
129 lines
4.1 KiB
C++
129 lines
4.1 KiB
C++
/*
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* Copyright (C) 2012-2019 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#include "JSStringJoiner.h"
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#include "JSCJSValueInlines.h"
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namespace JSC {
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JSStringJoiner::~JSStringJoiner()
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{
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}
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template<typename CharacterType>
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static inline void appendStringToData(CharacterType*& data, StringView string)
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{
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string.getCharactersWithUpconvert(data);
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data += string.length();
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}
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template<typename CharacterType>
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static inline String joinStrings(const Vector<StringViewWithUnderlyingString>& strings, StringView separator, unsigned joinedLength)
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{
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ASSERT(joinedLength);
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CharacterType* data;
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String result = StringImpl::tryCreateUninitialized(joinedLength, data);
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if (UNLIKELY(result.isNull()))
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return result;
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appendStringToData(data, strings[0].view);
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unsigned size = strings.size();
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switch (separator.length()) {
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case 0:
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for (unsigned i = 1; i < size; ++i)
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appendStringToData(data, strings[i].view);
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break;
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case 1: {
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CharacterType separatorCharacter = separator[0];
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for (unsigned i = 1; i < size; ++i) {
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*data++ = separatorCharacter;
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appendStringToData(data, strings[i].view);
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}
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break;
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}
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default:
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for (unsigned i = 1; i < size; ++i) {
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appendStringToData(data, separator);
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appendStringToData(data, strings[i].view);
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}
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}
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ASSERT(data == result.characters<CharacterType>() + joinedLength);
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return result;
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}
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inline unsigned JSStringJoiner::joinedLength(JSGlobalObject* globalObject) const
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{
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VM& vm = globalObject->vm();
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auto scope = DECLARE_THROW_SCOPE(vm);
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unsigned numberOfStrings = m_strings.size();
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if (!numberOfStrings)
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return 0;
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Checked<int32_t, RecordOverflow> separatorLength = m_separator.length();
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Checked<int32_t, RecordOverflow> totalSeparatorsLength = separatorLength * (numberOfStrings - 1);
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Checked<int32_t, RecordOverflow> totalLength = totalSeparatorsLength + m_accumulatedStringsLength;
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int32_t result;
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if (totalLength.safeGet(result) == CheckedState::DidOverflow) {
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throwOutOfMemoryError(globalObject, scope);
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return 0;
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}
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return result;
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}
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JSValue JSStringJoiner::join(JSGlobalObject* globalObject)
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{
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VM& vm = globalObject->vm();
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auto scope = DECLARE_THROW_SCOPE(vm);
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ASSERT(m_strings.size() <= m_strings.capacity());
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unsigned length = joinedLength(globalObject);
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RETURN_IF_EXCEPTION(scope, JSValue());
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if (!length)
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return jsEmptyString(vm);
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String result;
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if (m_isAll8Bit)
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result = joinStrings<LChar>(m_strings, m_separator, length);
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else
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result = joinStrings<UChar>(m_strings, m_separator, length);
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if (result.isNull())
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return throwOutOfMemoryError(globalObject, scope);
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return jsString(vm, WTFMove(result));
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}
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}
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