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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2004-2019 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "config.h"
#include "StringConstructor.h"
#include "JSCInlines.h"
#include "StringPrototype.h"
#include <wtf/text/StringBuilder.h>
namespace JSC {
static JSC_DECLARE_HOST_FUNCTION(stringFromCharCode);
static JSC_DECLARE_HOST_FUNCTION(stringFromCodePoint);
}
#include "StringConstructor.lut.h"
namespace JSC {
const ClassInfo StringConstructor::s_info = { "Function"_s, &Base::s_info, &stringConstructorTable, nullptr, CREATE_METHOD_TABLE(StringConstructor) };
/* Source for StringConstructor.lut.h
@begin stringConstructorTable
fromCharCode stringFromCharCode DontEnum|Function 1 FromCharCodeIntrinsic
fromCodePoint stringFromCodePoint DontEnum|Function 1
raw JSBuiltin DontEnum|Function 1
@end
*/
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(StringConstructor);
static JSC_DECLARE_HOST_FUNCTION(callStringConstructor);
static JSC_DECLARE_HOST_FUNCTION(constructWithStringConstructor);
StringConstructor::StringConstructor(VM& vm, NativeExecutable* executable, JSGlobalObject* globalObject, Structure* structure)
: Base(vm, executable, globalObject, structure)
{
}
void StringConstructor::finishCreation(VM& vm, StringPrototype* stringPrototype)
{
Base::finishCreation(vm);
putDirectWithoutTransition(vm, vm.propertyNames->prototype, stringPrototype, PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum | PropertyAttribute::DontDelete);
putDirectWithoutTransition(vm, vm.propertyNames->length, jsNumber(1), PropertyAttribute::DontEnum | PropertyAttribute::ReadOnly);
putDirectWithoutTransition(vm, vm.propertyNames->name, jsString(vm, vm.propertyNames->String.string()), PropertyAttribute::ReadOnly | PropertyAttribute::DontEnum);
}
StringConstructor* StringConstructor::create(VM& vm, Structure* structure, StringPrototype* stringPrototype)
{
JSGlobalObject* globalObject = structure->globalObject();
NativeExecutable* executable = vm.getHostFunction(callStringConstructor, ImplementationVisibility::Public, StringConstructorIntrinsic, constructWithStringConstructor, nullptr, vm.propertyNames->String.string());
StringConstructor* constructor = new (NotNull, allocateCell<StringConstructor>(vm)) StringConstructor(vm, executable, globalObject, structure);
constructor->finishCreation(vm, stringPrototype);
return constructor;
}
// ------------------------------ Functions --------------------------------
JSC_DEFINE_HOST_FUNCTION(stringFromCharCode, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
unsigned length = callFrame->argumentCount();
if (LIKELY(length == 1)) {
scope.release();
UChar code = callFrame->uncheckedArgument(0).toUInt32(globalObject);
// Not checking for an exception here is ok because jsSingleCharacterString will just fetch an unused string if there's an exception.
return JSValue::encode(jsSingleCharacterString(vm, code));
}
std::span<LChar> buf8Bit;
auto impl8Bit = StringImpl::createUninitialized(length, buf8Bit);
for (unsigned i = 0; i < length; ++i) {
UChar character = static_cast<UChar>(callFrame->uncheckedArgument(i).toUInt32(globalObject));
RETURN_IF_EXCEPTION(scope, encodedJSValue());
if (UNLIKELY(!isLatin1(character))) {
std::span<UChar> buf16Bit;
auto impl16Bit = StringImpl::createUninitialized(length, buf16Bit);
StringImpl::copyCharacters(buf16Bit, buf8Bit.first(i));
buf16Bit[i] = character;
++i;
for (; i < length; ++i) {
buf16Bit[i] = static_cast<UChar>(callFrame->uncheckedArgument(i).toUInt32(globalObject));
RETURN_IF_EXCEPTION(scope, encodedJSValue());
}
RELEASE_AND_RETURN(scope, JSValue::encode(jsString(vm, WTFMove(impl16Bit))));
}
buf8Bit[i] = static_cast<LChar>(character);
}
RELEASE_AND_RETURN(scope, JSValue::encode(jsString(vm, WTFMove(impl8Bit))));
}
JSString* stringFromCharCode(JSGlobalObject* globalObject, int32_t arg)
{
return jsSingleCharacterString(globalObject->vm(), static_cast<UChar>(arg));
}
JSC_DEFINE_HOST_FUNCTION(stringFromCodePoint, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
unsigned length = callFrame->argumentCount();
StringBuilder builder;
builder.reserveCapacity(length);
for (unsigned i = 0; i < length; ++i) {
double codePointAsDouble = callFrame->uncheckedArgument(i).toNumber(globalObject);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
uint32_t codePoint = static_cast<uint32_t>(codePointAsDouble);
if (codePoint != codePointAsDouble || codePoint > UCHAR_MAX_VALUE)
return throwVMError(globalObject, scope, createRangeError(globalObject, "Arguments contain a value that is out of range of code points"_s));
if (U_IS_BMP(codePoint))
builder.append(static_cast<UChar>(codePoint));
else {
builder.append(U16_LEAD(codePoint));
builder.append(U16_TRAIL(codePoint));
}
}
RELEASE_AND_RETURN(scope, JSValue::encode(jsString(vm, builder.toString())));
}
JSC_DEFINE_HOST_FUNCTION(constructWithStringConstructor, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
JSObject* newTarget = asObject(callFrame->newTarget());
Structure* structure = JSC_GET_DERIVED_STRUCTURE(vm, stringObjectStructure, newTarget, callFrame->jsCallee());
RETURN_IF_EXCEPTION(scope, { });
if (!callFrame->argumentCount())
return JSValue::encode(StringObject::create(vm, structure));
JSString* str = callFrame->uncheckedArgument(0).toString(globalObject);
RETURN_IF_EXCEPTION(scope, encodedJSValue());
return JSValue::encode(StringObject::create(vm, structure, str));
}
JSString* stringConstructor(JSGlobalObject* globalObject, JSValue argument)
{
VM& vm = globalObject->vm();
if (argument.isSymbol())
return jsNontrivialString(vm, asSymbol(argument)->descriptiveString());
return argument.toString(globalObject);
}
JSC_DEFINE_HOST_FUNCTION(callStringConstructor, (JSGlobalObject* globalObject, CallFrame* callFrame))
{
VM& vm = globalObject->vm();
if (!callFrame->argumentCount())
return JSValue::encode(jsEmptyString(vm));
return JSValue::encode(stringConstructor(globalObject, callFrame->uncheckedArgument(0)));
}
} // namespace JSC
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