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/*
* Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
* Copyright (C) 2003, 2007, 2008, 2012 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 "RegExpObject.h"
#include "ButterflyInlines.h"
#include "CopiedSpaceInlines.h"
#include "Error.h"
#include "ExceptionHelpers.h"
#include "JSArray.h"
#include "JSGlobalObject.h"
#include "JSString.h"
#include "Lookup.h"
#include "JSCInlines.h"
#include "RegExpConstructor.h"
#include "RegExpMatchesArray.h"
#include "RegExpPrototype.h"
#include <wtf/text/StringBuilder.h>
namespace JSC {
STATIC_ASSERT_IS_TRIVIALLY_DESTRUCTIBLE(RegExpObject);
const ClassInfo RegExpObject::s_info = { "RegExp", &Base::s_info, nullptr, CREATE_METHOD_TABLE(RegExpObject) };
RegExpObject::RegExpObject(VM& vm, Structure* structure, RegExp* regExp)
: JSNonFinalObject(vm, structure)
, m_regExp(vm, this, regExp)
, m_lastIndexIsWritable(true)
{
m_lastIndex.setWithoutWriteBarrier(jsNumber(0));
}
void RegExpObject::finishCreation(VM& vm)
{
Base::finishCreation(vm);
ASSERT(inherits(info()));
}
void RegExpObject::visitChildren(JSCell* cell, SlotVisitor& visitor)
{
RegExpObject* thisObject = jsCast<RegExpObject*>(cell);
ASSERT_GC_OBJECT_INHERITS(thisObject, info());
Base::visitChildren(thisObject, visitor);
visitor.append(&thisObject->m_regExp);
visitor.append(&thisObject->m_lastIndex);
}
bool RegExpObject::getOwnPropertySlot(JSObject* object, ExecState* exec, PropertyName propertyName, PropertySlot& slot)
{
if (propertyName == exec->propertyNames().lastIndex) {
RegExpObject* regExp = asRegExpObject(object);
unsigned attributes = regExp->m_lastIndexIsWritable ? DontDelete | DontEnum : DontDelete | DontEnum | ReadOnly;
slot.setValue(regExp, attributes, regExp->getLastIndex());
return true;
}
return Base::getOwnPropertySlot(object, exec, propertyName, slot);
}
bool RegExpObject::deleteProperty(JSCell* cell, ExecState* exec, PropertyName propertyName)
{
if (propertyName == exec->propertyNames().lastIndex)
return false;
return Base::deleteProperty(cell, exec, propertyName);
}
void RegExpObject::getOwnNonIndexPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
if (mode.includeDontEnumProperties())
propertyNames.add(exec->propertyNames().lastIndex);
Base::getOwnNonIndexPropertyNames(object, exec, propertyNames, mode);
}
void RegExpObject::getPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
if (mode.includeDontEnumProperties())
propertyNames.add(exec->propertyNames().lastIndex);
Base::getPropertyNames(object, exec, propertyNames, mode);
}
void RegExpObject::getGenericPropertyNames(JSObject* object, ExecState* exec, PropertyNameArray& propertyNames, EnumerationMode mode)
{
if (mode.includeDontEnumProperties())
propertyNames.add(exec->propertyNames().lastIndex);
Base::getGenericPropertyNames(object, exec, propertyNames, mode);
}
static bool reject(ExecState* exec, bool throwException, const char* message)
{
if (throwException)
throwTypeError(exec, ASCIILiteral(message));
return false;
}
bool RegExpObject::defineOwnProperty(JSObject* object, ExecState* exec, PropertyName propertyName, const PropertyDescriptor& descriptor, bool shouldThrow)
{
if (propertyName == exec->propertyNames().lastIndex) {
RegExpObject* regExp = asRegExpObject(object);
if (descriptor.configurablePresent() && descriptor.configurable())
return reject(exec, shouldThrow, "Attempting to change configurable attribute of unconfigurable property.");
if (descriptor.enumerablePresent() && descriptor.enumerable())
return reject(exec, shouldThrow, "Attempting to change enumerable attribute of unconfigurable property.");
if (descriptor.isAccessorDescriptor())
return reject(exec, shouldThrow, "Attempting to change access mechanism for an unconfigurable property.");
if (!regExp->m_lastIndexIsWritable) {
if (descriptor.writablePresent() && descriptor.writable())
return reject(exec, shouldThrow, "Attempting to change writable attribute of unconfigurable property.");
if (!sameValue(exec, regExp->getLastIndex(), descriptor.value()))
return reject(exec, shouldThrow, "Attempting to change value of a readonly property.");
return true;
}
if (descriptor.value())
regExp->setLastIndex(exec, descriptor.value(), false);
if (descriptor.writablePresent() && !descriptor.writable())
regExp->m_lastIndexIsWritable = false;
return true;
}
return Base::defineOwnProperty(object, exec, propertyName, descriptor, shouldThrow);
}
static void regExpObjectSetLastIndexStrict(ExecState* exec, EncodedJSValue thisValue, EncodedJSValue value)
{
asRegExpObject(JSValue::decode(thisValue))->setLastIndex(exec, JSValue::decode(value), true);
}
static void regExpObjectSetLastIndexNonStrict(ExecState* exec, EncodedJSValue thisValue, EncodedJSValue value)
{
asRegExpObject(JSValue::decode(thisValue))->setLastIndex(exec, JSValue::decode(value), false);
}
void RegExpObject::put(JSCell* cell, ExecState* exec, PropertyName propertyName, JSValue value, PutPropertySlot& slot)
{
if (propertyName == exec->propertyNames().lastIndex) {
asRegExpObject(cell)->setLastIndex(exec, value, slot.isStrictMode());
slot.setCustomValue(asRegExpObject(cell), slot.isStrictMode()
? regExpObjectSetLastIndexStrict
: regExpObjectSetLastIndexNonStrict);
return;
}
Base::put(cell, exec, propertyName, value, slot);
}
JSValue RegExpObject::exec(ExecState* exec, JSString* string)
{
if (MatchResult result = match(exec, string))
return createRegExpMatchesArray(exec, string, regExp(), result);
return jsNull();
}
// Shared implementation used by test and exec.
MatchResult RegExpObject::match(ExecState* exec, JSString* string)
{
RegExp* regExp = this->regExp();
RegExpConstructor* regExpConstructor = exec->lexicalGlobalObject()->regExpConstructor();
String input = string->value(exec);
VM& vm = exec->vm();
if (!regExp->global())
return regExpConstructor->performMatch(vm, regExp, string, input, 0);
JSValue jsLastIndex = getLastIndex();
unsigned lastIndex;
if (LIKELY(jsLastIndex.isUInt32())) {
lastIndex = jsLastIndex.asUInt32();
if (lastIndex > input.length()) {
setLastIndex(exec, 0);
return MatchResult::failed();
}
} else {
double doubleLastIndex = jsLastIndex.toInteger(exec);
if (doubleLastIndex < 0 || doubleLastIndex > input.length()) {
setLastIndex(exec, 0);
return MatchResult::failed();
}
lastIndex = static_cast<unsigned>(doubleLastIndex);
}
MatchResult result = regExpConstructor->performMatch(vm, regExp, string, input, lastIndex);
setLastIndex(exec, result.end);
return result;
}
} // namespace JSC
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