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