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https://github.com/mozilla/gecko-dev.git
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265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
229 lines
5.6 KiB
C++
229 lines
5.6 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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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#ifndef AddonManagerStartup_inlines_h
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#define AddonManagerStartup_inlines_h
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#include "jsapi.h"
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#include "nsJSUtils.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/Move.h"
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namespace mozilla {
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class ArrayIterElem;
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class PropertyIterElem;
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/*****************************************************************************
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* Object iterator base classes
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*****************************************************************************/
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template <class T, class PropertyType>
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class MOZ_STACK_CLASS BaseIter {
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public:
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typedef T SelfType;
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PropertyType begin() const {
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PropertyType elem(Self());
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return std::move(elem);
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}
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PropertyType end() const {
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PropertyType elem(Self());
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return elem.End();
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}
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void* Context() const { return mContext; }
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protected:
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BaseIter(JSContext* cx, JS::HandleObject object, void* context = nullptr)
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: mCx(cx), mObject(object), mContext(context) {}
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const SelfType& Self() const { return *static_cast<const SelfType*>(this); }
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SelfType& Self() { return *static_cast<SelfType*>(this); }
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JSContext* mCx;
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JS::HandleObject mObject;
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void* mContext;
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};
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template <class T, class IterType>
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class MOZ_STACK_CLASS BaseIterElem {
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public:
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typedef T SelfType;
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explicit BaseIterElem(const IterType& iter, uint32_t index = 0)
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: mIter(iter), mIndex(index) {}
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uint32_t Length() const { return mIter.Length(); }
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JS::Value Value() {
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JS::RootedValue value(mIter.mCx, JS::UndefinedValue());
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auto& self = Self();
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if (!self.GetValue(&value)) {
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JS_ClearPendingException(mIter.mCx);
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}
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return value;
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}
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SelfType& operator*() { return Self(); }
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SelfType& operator++() {
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MOZ_ASSERT(mIndex < Length());
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mIndex++;
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return Self();
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}
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bool operator!=(const SelfType& other) const {
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return &mIter != &other.mIter || mIndex != other.mIndex;
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}
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SelfType End() const {
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SelfType end(mIter);
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end.mIndex = Length();
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return std::move(end);
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}
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void* Context() const { return mIter.Context(); }
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protected:
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const SelfType& Self() const { return *static_cast<const SelfType*>(this); }
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SelfType& Self() { return *static_cast<SelfType*>(this); }
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const IterType& mIter;
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uint32_t mIndex;
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};
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/*****************************************************************************
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* Property iteration
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*****************************************************************************/
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class MOZ_STACK_CLASS PropertyIter
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: public BaseIter<PropertyIter, PropertyIterElem> {
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friend class PropertyIterElem;
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friend class BaseIterElem<PropertyIterElem, PropertyIter>;
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public:
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PropertyIter(JSContext* cx, JS::HandleObject object, void* context = nullptr)
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: BaseIter(cx, object, context), mIds(cx, JS::IdVector(cx)) {
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if (!JS_Enumerate(cx, object, &mIds)) {
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JS_ClearPendingException(cx);
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}
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}
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PropertyIter(const PropertyIter& other)
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: PropertyIter(other.mCx, other.mObject, other.mContext) {}
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PropertyIter& operator=(const PropertyIter& other) {
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MOZ_ASSERT(other.mObject == mObject);
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mCx = other.mCx;
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mContext = other.mContext;
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mIds.clear();
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if (!JS_Enumerate(mCx, mObject, &mIds)) {
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JS_ClearPendingException(mCx);
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}
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return *this;
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}
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int32_t Length() const { return mIds.length(); }
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protected:
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JS::Rooted<JS::IdVector> mIds;
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};
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class MOZ_STACK_CLASS PropertyIterElem
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: public BaseIterElem<PropertyIterElem, PropertyIter> {
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friend class BaseIterElem<PropertyIterElem, PropertyIter>;
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public:
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using BaseIterElem::BaseIterElem;
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PropertyIterElem(const PropertyIterElem& other)
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: BaseIterElem(other.mIter, other.mIndex) {}
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jsid Id() {
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MOZ_ASSERT(mIndex < mIter.mIds.length());
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return mIter.mIds[mIndex];
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}
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const nsAString& Name() {
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if (mName.isNothing()) {
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mName.emplace();
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mName.ref().init(mIter.mCx, Id());
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}
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return mName.ref();
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}
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JSContext* Cx() { return mIter.mCx; }
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protected:
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bool GetValue(JS::MutableHandleValue value) {
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MOZ_ASSERT(mIndex < Length());
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JS::Rooted<jsid> id(mIter.mCx, Id());
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return JS_GetPropertyById(mIter.mCx, mIter.mObject, id, value);
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}
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private:
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Maybe<nsAutoJSString> mName;
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};
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/*****************************************************************************
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* Array iteration
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*****************************************************************************/
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class MOZ_STACK_CLASS ArrayIter : public BaseIter<ArrayIter, ArrayIterElem> {
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friend class ArrayIterElem;
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friend class BaseIterElem<ArrayIterElem, ArrayIter>;
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public:
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ArrayIter(JSContext* cx, JS::HandleObject object)
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: BaseIter(cx, object), mLength(0) {
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bool isArray;
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if (!JS_IsArrayObject(cx, object, &isArray) || !isArray) {
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JS_ClearPendingException(cx);
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return;
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}
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if (!JS_GetArrayLength(cx, object, &mLength)) {
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JS_ClearPendingException(cx);
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}
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}
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uint32_t Length() const { return mLength; }
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private:
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uint32_t mLength;
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};
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class MOZ_STACK_CLASS ArrayIterElem
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: public BaseIterElem<ArrayIterElem, ArrayIter> {
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friend class BaseIterElem<ArrayIterElem, ArrayIter>;
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public:
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using BaseIterElem::BaseIterElem;
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ArrayIterElem(const ArrayIterElem& other)
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: BaseIterElem(other.mIter, other.mIndex) {}
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protected:
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bool GetValue(JS::MutableHandleValue value) {
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MOZ_ASSERT(mIndex < Length());
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return JS_GetElement(mIter.mCx, mIter.mObject, mIndex, value);
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}
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};
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} // namespace mozilla
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#endif // AddonManagerStartup_inlines_h
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