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/*
* Copyright (C) 2010-2023 Apple Inc. All rights reserved.
* Copyright (C) 2024 Samuel Weinig <sam@webkit.org>
*
* 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.
*/
#pragma once
#include <wtf/CheckedArithmetic.h>
#include <wtf/StdLibExtras.h>
#include <wtf/text/AtomString.h>
#include <wtf/text/StringBuilder.h>
#include <wtf/text/StringConcatenateNumbers.h>
#include <wtf/text/StringView.h>
namespace WTF {
template<typename StringTypeAdapter> constexpr bool makeStringSlowPathRequiredForAdapter = requires(const StringTypeAdapter& adapter) {
{ adapter.writeUsing(std::declval<StringBuilder&>) } -> std::same_as<void>;
};
template<typename... StringTypeAdapters> constexpr bool makeStringSlowPathRequired = (... || makeStringSlowPathRequiredForAdapter<StringTypeAdapters>);
template<typename... StringTypeAdapters>
RefPtr<StringImpl> tryMakeStringImplFromAdaptersInternal(unsigned length, bool areAllAdapters8Bit, StringTypeAdapters... adapters)
{
ASSERT(length <= String::MaxLength);
if (areAllAdapters8Bit) {
std::span<LChar> buffer;
RefPtr result = StringImpl::tryCreateUninitialized(length, buffer);
if (!result)
return nullptr;
if (buffer.data())
stringTypeAdapterAccumulator(buffer, adapters...);
return result;
}
std::span<UChar> buffer;
RefPtr result = StringImpl::tryCreateUninitialized(length, buffer);
if (!result)
return nullptr;
if (buffer.data())
stringTypeAdapterAccumulator(buffer, adapters...);
return result;
}
template<typename... StringTypeAdapters>
String tryMakeStringFromAdapters(StringTypeAdapters&&... adapters)
{
static_assert(String::MaxLength == std::numeric_limits<int32_t>::max());
if constexpr (makeStringSlowPathRequired<StringTypeAdapters...>) {
StringBuilder builder;
builder.appendFromAdapters(std::forward<StringTypeAdapters>(adapters)...);
return builder.toString();
} else {
auto sum = checkedSum<int32_t>(adapters.length()...);
if (sum.hasOverflowed())
return String();
bool areAllAdapters8Bit = are8Bit(adapters...);
return tryMakeStringImplFromAdaptersInternal(sum, areAllAdapters8Bit, adapters...);
}
}
template<StringTypeAdaptable... StringTypes>
String tryMakeString(const StringTypes& ...strings)
{
return tryMakeStringFromAdapters(StringTypeAdapter<StringTypes>(strings)...);
}
template<StringTypeAdaptable... StringTypes>
String makeString(StringTypes... strings)
{
auto result = tryMakeString(strings...);
if (!result)
CRASH();
return result;
}
template<typename... StringTypeAdapters>
AtomString tryMakeAtomStringFromAdapters(StringTypeAdapters ...adapters)
{
static_assert(String::MaxLength == std::numeric_limits<int32_t>::max());
if constexpr (makeStringSlowPathRequired<StringTypeAdapters...>) {
StringBuilder builder;
builder.appendFromAdapters(adapters...);
return builder.toAtomString();
} else {
auto sum = checkedSum<int32_t>(adapters.length()...);
if (sum.hasOverflowed())
return AtomString();
unsigned length = sum;
ASSERT(length <= String::MaxLength);
bool areAllAdapters8Bit = are8Bit(adapters...);
constexpr size_t maxLengthToUseStackVariable = 64;
if (length < maxLengthToUseStackVariable) {
if (areAllAdapters8Bit) {
std::array<LChar, maxLengthToUseStackVariable> buffer;
stringTypeAdapterAccumulator(std::span<LChar> { buffer }, adapters...);
return std::span<const LChar> { buffer }.first(length);
}
std::array<UChar, maxLengthToUseStackVariable> buffer;
stringTypeAdapterAccumulator(std::span<UChar> { buffer }, adapters...);
return std::span<const UChar> { buffer }.first(length);
}
return tryMakeStringImplFromAdaptersInternal(length, areAllAdapters8Bit, adapters...).get();
}
}
template<StringTypeAdaptable... StringTypes>
AtomString tryMakeAtomString(StringTypes... strings)
{
return tryMakeAtomStringFromAdapters(StringTypeAdapter<StringTypes>(strings)...);
}
template<StringTypeAdaptable... StringTypes>
AtomString makeAtomString(StringTypes... strings)
{
auto result = tryMakeAtomString(strings...);
if (result.isNull())
CRASH();
return result;
}
inline String WARN_UNUSED_RETURN makeStringByInserting(StringView originalString, StringView stringToInsert, unsigned position)
{
return makeString(originalString.left(position), stringToInsert, originalString.substring(position));
}
// Helper functor useful in generic contexts where both makeString() and StringBuilder are being used.
struct SerializeUsingMakeString {
using Result = String;
template<typename... T> String operator()(T&&... args)
{
return makeString(std::forward<T>(args)...);
}
};
} // namespace WTF
using WTF::makeAtomString;
using WTF::makeString;
using WTF::makeStringByInserting;
using WTF::tryMakeAtomString;
using WTF::tryMakeString;
using WTF::SerializeUsingMakeString;
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