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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2004-2008, 2016 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 "StringObject.h"
#include "Error.h"
#include "JSGlobalObject.h"
#include "JSCInlines.h"
#include "PropertyNameArray.h"
namespace JSC {
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(StringObject);
const ClassInfo StringObject::s_info = { "String", &JSWrapperObject::s_info, 0, CREATE_METHOD_TABLE(StringObject) };
StringObject::StringObject(VM& vm, Structure* structure)
: JSWrapperObject(vm, structure)
{
}
void StringObject::finishCreation(VM& vm, JSString* string)
{
Base::finishCreation(vm);
ASSERT(inherits(vm, info()));
setInternalValue(vm, string);
}
bool StringObject::getOwnPropertySlot(JSObject* cell, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
StringObject* thisObject = jsCast<StringObject*>(cell);
if (thisObject->internalValue()->getStringPropertySlot(exec, propertyName, slot))
return true;
return JSObject::getOwnPropertySlot(thisObject, exec, propertyName, slot);
}
bool StringObject::getOwnPropertySlotByIndex(JSObject* object, ExecState* exec, unsigned propertyName, PropertySlot& slot)
{
StringObject* thisObject = jsCast<StringObject*>(object);
if (thisObject->internalValue()->getStringPropertySlot(exec, propertyName, slot))
return true;
return JSObject::getOwnPropertySlot(thisObject, exec, Identifier::from(exec, propertyName), slot);
}
bool StringObject::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
StringObject* thisObject = jsCast<StringObject*>(cell);
if (UNLIKELY(isThisValueAltered(slot, thisObject))) {
scope.release();
return ordinarySetSlow(exec, thisObject, propertyName, value, slot.thisValue(), slot.isStrictMode());
}
if (propertyName == vm.propertyNames->length)
return typeError(exec, scope, slot.isStrictMode(), ASCIILiteral(ReadonlyPropertyWriteError));
if (std::optional<uint32_t> index = parseIndex(propertyName)) {
scope.release();
return putByIndex(cell, exec, index.value(), value, slot.isStrictMode());
}
scope.release();
return JSObject::put(cell, exec, propertyName, value, slot);
}
bool StringObject::putByIndex(JSCell* cell, ExecState* exec, unsigned propertyName, JSValue value, bool shouldThrow)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
StringObject* thisObject = jsCast<StringObject*>(cell);
if (thisObject->internalValue()->canGetIndex(propertyName))
return typeError(exec, scope, shouldThrow, ASCIILiteral(ReadonlyPropertyWriteError));
scope.release();
return JSObject::putByIndex(cell, exec, propertyName, value, shouldThrow);
}
static bool isStringOwnProperty(ExecState* exec, StringObject* object, PropertyName propertyName)
{
if (propertyName == exec->propertyNames().length)
return true;
if (std::optional<uint32_t> index = parseIndex(propertyName)) {
if (object->internalValue()->canGetIndex(index.value()))
return true;
}
return false;
}
bool StringObject::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, const PropertyDescriptor& descriptor, bool throwException)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
StringObject* thisObject = jsCast<StringObject*>(object);
if (isStringOwnProperty(exec, thisObject, propertyName)) {
// The current PropertyDescriptor is always
// PropertyDescriptor{[[Value]]: value, [[Writable]]: false, [[Enumerable]]: true, [[Configurable]]: false}.
// This ensures that any property descriptor cannot change the existing one.
// Here, simply return the result of validateAndApplyPropertyDescriptor.
// https://tc39.github.io/ecma262/#sec-string-exotic-objects-getownproperty-p
PropertyDescriptor current;
bool isCurrentDefined = thisObject->getOwnPropertyDescriptor(exec, propertyName, current);
ASSERT(isCurrentDefined);
bool isExtensible = thisObject->isExtensible(exec);
RETURN_IF_EXCEPTION(scope, false);
scope.release();
return validateAndApplyPropertyDescriptor(exec, nullptr, propertyName, isExtensible, descriptor, isCurrentDefined, current, throwException);
}
scope.release();
return Base::defineOwnProperty(object, exec, propertyName, descriptor, throwException);
}
bool StringObject::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
{
StringObject* thisObject = jsCast<StringObject*>(cell);
if (propertyName == exec->propertyNames().length)
return false;
std::optional<uint32_t> index = parseIndex(propertyName);
if (index && thisObject->internalValue()->canGetIndex(index.value()))
return false;
return JSObject::deleteProperty(thisObject, exec, propertyName);
}
bool StringObject::deletePropertyByIndex(JSCell* cell, ExecState* exec, unsigned i)
{
StringObject* thisObject = jsCast<StringObject*>(cell);
if (thisObject->internalValue()->canGetIndex(i))
return false;
return JSObject::deletePropertyByIndex(thisObject, exec, i);
}
void StringObject::getOwnPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
StringObject* thisObject = jsCast<StringObject*>(object);
if (propertyNames.includeStringProperties()) {
int size = thisObject->internalValue()->length();
for (int i = 0; i < size; ++i)
propertyNames.add(Identifier::from(exec, i));
}
if (mode.includeDontEnumProperties())
propertyNames.add(exec->propertyNames().length);
return JSObject::getOwnPropertyNames(thisObject, exec, propertyNames, mode);
}
StringObject* constructString(VM& vm, JSGlobalObject* globalObject, JSValue string)
{
StringObject* object = StringObject::create(vm, globalObject->stringObjectStructure());
object->setInternalValue(vm, string);
return object;
}
} // namespace JSC
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