IteratorOperations.h [plain text]
#pragma once
#include "JSCJSValue.h"
#include "JSObject.h"
#include "ThrowScope.h"
namespace JSC {
struct IterationRecord {
JSValue iterator;
JSValue nextMethod;
};
JSValue iteratorNext(ExecState*, IterationRecord, JSValue argument = JSValue());
JS_EXPORT_PRIVATE JSValue iteratorValue(ExecState*, JSValue iterResult);
bool iteratorComplete(ExecState*, JSValue iterResult);
JS_EXPORT_PRIVATE JSValue iteratorStep(ExecState*, IterationRecord);
JS_EXPORT_PRIVATE void iteratorClose(ExecState*, IterationRecord);
JS_EXPORT_PRIVATE JSObject* createIteratorResultObject(ExecState*, JSValue, bool done);
Structure* createIteratorResultObjectStructure(VM&, JSGlobalObject&);
JS_EXPORT_PRIVATE JSValue iteratorMethod(ExecState&, JSObject*);
JS_EXPORT_PRIVATE IterationRecord iteratorForIterable(ExecState&, JSObject*, JSValue iteratorMethod);
JS_EXPORT_PRIVATE IterationRecord iteratorForIterable(ExecState*, JSValue iterable);
JS_EXPORT_PRIVATE JSValue iteratorMethod(ExecState&, JSObject*);
JS_EXPORT_PRIVATE bool hasIteratorMethod(ExecState&, JSValue);
template<typename CallBackType>
void forEachInIterable(ExecState* exec, JSValue iterable, const CallBackType& callback)
{
auto& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
IterationRecord iterationRecord = iteratorForIterable(exec, iterable);
RETURN_IF_EXCEPTION(scope, void());
while (true) {
JSValue next = iteratorStep(exec, iterationRecord);
if (UNLIKELY(scope.exception()) || next.isFalse())
return;
JSValue nextValue = iteratorValue(exec, next);
RETURN_IF_EXCEPTION(scope, void());
callback(vm, exec, nextValue);
if (UNLIKELY(scope.exception())) {
scope.release();
iteratorClose(exec, iterationRecord);
return;
}
}
}
template<typename CallBackType>
void forEachInIterable(ExecState& state, JSObject* iterable, JSValue iteratorMethod, const CallBackType& callback)
{
auto& vm = state.vm();
auto scope = DECLARE_THROW_SCOPE(vm);
auto iterationRecord = iteratorForIterable(state, iterable, iteratorMethod);
RETURN_IF_EXCEPTION(scope, void());
while (true) {
JSValue next = iteratorStep(&state, iterationRecord);
if (UNLIKELY(scope.exception()) || next.isFalse())
return;
JSValue nextValue = iteratorValue(&state, next);
RETURN_IF_EXCEPTION(scope, void());
callback(vm, state, nextValue);
if (UNLIKELY(scope.exception())) {
scope.release();
iteratorClose(&state, iterationRecord);
return;
}
}
}
}