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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 sts=2 et cindent: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "js/Iterator.h"
#include "js/Conversions.h"
#include "vm/Interpreter.h"
#include "vm/JSAtomState.h"
#include "vm/JSContext.h"
#include "vm/ObjectOperations.h"
#include "vm/SelfHosting.h"
#include "vm/StringType.h"
#include "vm/JSContext-inl.h" // JSContext::check
#include "vm/JSObject-inl.h"
using namespace js;
namespace JS {
// https://tc39.es/ecma262/#sec-getiterator
// GetIterator(obj [, hint [, method]])
JSObject* GetIteratorObject(JSContext* cx, HandleValue obj, bool isAsync) {
cx->check(obj);
FixedInvokeArgs<3> args(cx);
args[0].set(obj);
args[1].setBoolean(isAsync);
args[2].setUndefined(); // method
RootedValue rval(cx);
if (!CallSelfHostedFunction(cx, cx->names().GetIterator, UndefinedHandleValue,
args, &rval)) {
return nullptr;
}
MOZ_ASSERT(rval.isObject());
return &rval.toObject();
}
// https://tc39.es/ecma262/#sec-iteratornext
bool IteratorNext(JSContext* cx, HandleObject iteratorRecord,
MutableHandleValue result) {
cx->check(iteratorRecord);
FixedInvokeArgs<1> args(cx);
args[0].setObject(*iteratorRecord);
return CallSelfHostedFunction(cx, cx->names().IteratorNext,
UndefinedHandleValue, args, result);
}
// https://tc39.es/ecma262/#sec-iteratorcomplete
bool IteratorComplete(JSContext* cx, HandleObject iterResult, bool* done) {
cx->check(iterResult);
RootedValue doneV(cx);
if (!GetProperty(cx, iterResult, iterResult, cx->names().done, &doneV)) {
return false;
}
*done = ToBoolean(doneV);
return true;
}
// https://tc39.es/ecma262/#sec-iteratorvalue
bool IteratorValue(JSContext* cx, HandleObject iterResult,
MutableHandleValue value) {
cx->check(iterResult);
return GetProperty(cx, iterResult, iterResult, cx->names().value, value);
}
bool GetIteratorRecordIterator(JSContext* cx, HandleObject iteratorRecord,
MutableHandleValue iterator) {
cx->check(iteratorRecord);
return GetProperty(cx, iteratorRecord, iteratorRecord, cx->names().iterator,
iterator);
}
// https://tc39.es/ecma262/#sec-getmethod
static bool GetMethod(JSContext* cx, HandleValue v, Handle<PropertyName*> name,
MutableHandleValue result) {
// Step 1. Let func be ? GetV(V, P).
RootedValue func(cx);
if (!GetProperty(cx, v, name, &func)) {
return false;
}
// Step 2. If func is either undefined or null, return undefined.
if (func.isNullOrUndefined()) {
result.setUndefined();
return true;
}
// Step 3. If IsCallable(func) is false, throw a TypeError exception.
if (!IsCallable(func)) {
return ReportIsNotFunction(cx, func, -1);
}
// Step 4. Return func.
result.set(func);
return true;
}
bool GetReturnMethod(JSContext* cx, HandleValue iterator,
MutableHandleValue result) {
cx->check(iterator);
// Step 2. Let returnMethod be GetMethod(iterator, "return").
return GetMethod(cx, iterator, cx->names().return_, result);
}
} // namespace JS
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