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/*
* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
*
* 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.
*/
#include "config.h"
#include "IteratorOperations.h"
#include "Error.h"
#include "JSCInlines.h"
#include "ObjectConstructor.h"
using namespace WTF;
namespace JSC {
JSValue iteratorNext(ExecState* exec, JSValue iterator, JSValue value)
{
JSValue nextFunction = iterator.get(exec, exec->vm().propertyNames->next);
if (exec->hadException())
return jsUndefined();
CallData nextFunctionCallData;
CallType nextFunctionCallType = getCallData(nextFunction, nextFunctionCallData);
if (nextFunctionCallType == CallTypeNone)
return throwTypeError(exec);
MarkedArgumentBuffer nextFunctionArguments;
if (!value.isEmpty())
nextFunctionArguments.append(value);
JSValue result = call(exec, nextFunction, nextFunctionCallType, nextFunctionCallData, iterator, nextFunctionArguments);
if (exec->hadException())
return jsUndefined();
if (!result.isObject())
return throwTypeError(exec, ASCIILiteral("Iterator result interface is not an object."));
return result;
}
JSValue iteratorNext(ExecState* exec, JSValue iterator)
{
return iteratorNext(exec, iterator, JSValue());
}
JSValue iteratorValue(ExecState* exec, JSValue iterResult)
{
return iterResult.get(exec, exec->vm().propertyNames->value);
}
bool iteratorComplete(ExecState* exec, JSValue iterResult)
{
JSValue done = iterResult.get(exec, exec->vm().propertyNames->done);
return done.toBoolean(exec);
}
JSValue iteratorStep(ExecState* exec, JSValue iterator)
{
JSValue result = iteratorNext(exec, iterator);
if (exec->hadException())
return jsUndefined();
bool done = iteratorComplete(exec, result);
if (exec->hadException())
return jsUndefined();
if (done)
return jsBoolean(false);
return result;
}
void iteratorClose(ExecState* exec, JSValue iterator)
{
Exception* exception = nullptr;
if (exec->hadException()) {
exception = exec->exception();
exec->clearException();
}
JSValue returnFunction = iterator.get(exec, exec->vm().propertyNames->returnKeyword);
if (exec->hadException())
return;
if (returnFunction.isUndefined()) {
if (exception)
exec->vm().throwException(exec, exception);
return;
}
CallData returnFunctionCallData;
CallType returnFunctionCallType = getCallData(returnFunction, returnFunctionCallData);
if (returnFunctionCallType == CallTypeNone) {
if (exception)
exec->vm().throwException(exec, exception);
else
throwTypeError(exec);
return;
}
MarkedArgumentBuffer returnFunctionArguments;
JSValue innerResult = call(exec, returnFunction, returnFunctionCallType, returnFunctionCallData, iterator, returnFunctionArguments);
if (exception) {
exec->vm().throwException(exec, exception);
return;
}
if (exec->hadException())
return;
if (!innerResult.isObject()) {
throwTypeError(exec, ASCIILiteral("Iterator result interface is not an object."));
return;
}
}
static const PropertyOffset donePropertyOffset = 0;
static const PropertyOffset valuePropertyOffset = 1;
Structure* createIteratorResultObjectStructure(VM& vm, JSGlobalObject& globalObject)
{
Structure* iteratorResultStructure = vm.prototypeMap.emptyObjectStructureForPrototype(globalObject.objectPrototype(), JSFinalObject::defaultInlineCapacity());
PropertyOffset offset;
iteratorResultStructure = Structure::addPropertyTransition(vm, iteratorResultStructure, vm.propertyNames->done, 0, offset);
RELEASE_ASSERT(offset == donePropertyOffset);
iteratorResultStructure = Structure::addPropertyTransition(vm, iteratorResultStructure, vm.propertyNames->value, 0, offset);
RELEASE_ASSERT(offset == valuePropertyOffset);
return iteratorResultStructure;
}
JSObject* createIteratorResultObject(ExecState* exec, JSValue value, bool done)
{
JSObject* resultObject = constructEmptyObject(exec, exec->lexicalGlobalObject()->iteratorResultObjectStructure());
resultObject->putDirect(exec->vm(), donePropertyOffset, jsBoolean(done));
resultObject->putDirect(exec->vm(), valuePropertyOffset, value);
return resultObject;
}
} // namespace JSC
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