mirror of
https://github.com/mozilla/gecko-dev.git
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779fb0d72a
Differential Revision: https://phabricator.services.mozilla.com/D33445 --HG-- extra : moz-landing-system : lando
312 lines
8.3 KiB
C++
312 lines
8.3 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "nsStringEnumerator.h"
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#include "nsSimpleEnumerator.h"
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#include "nsSupportsPrimitives.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/ResultExtensions.h"
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#include "mozilla/dom/IteratorResultBinding.h"
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#include "mozilla/dom/RootedDictionary.h"
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#include "mozilla/dom/ToJSValue.h"
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#include "nsTArray.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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namespace {
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class JSStringEnumerator final : public nsIJSEnumerator {
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NS_DECL_ISUPPORTS
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NS_DECL_NSIJSENUMERATOR
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explicit JSStringEnumerator(nsIStringEnumerator* aEnumerator)
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: mEnumerator(aEnumerator) {
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MOZ_ASSERT(mEnumerator);
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}
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private:
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~JSStringEnumerator() = default;
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nsCOMPtr<nsIStringEnumerator> mEnumerator;
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};
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} // anonymous namespace
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nsresult JSStringEnumerator::Iterator(nsIJSEnumerator** aResult) {
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RefPtr<JSStringEnumerator> result(this);
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result.forget(aResult);
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return NS_OK;
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}
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nsresult JSStringEnumerator::Next(JSContext* aCx,
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JS::MutableHandleValue aResult) {
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RootedDictionary<IteratorResult> result(aCx);
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nsAutoString elem;
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if (NS_FAILED(mEnumerator->GetNext(elem))) {
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result.mDone = true;
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} else {
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result.mDone = false;
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if (!ToJSValue(
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aCx, elem,
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JS::MutableHandleValue::fromMarkedLocation(&result.mValue))) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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}
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if (!ToJSValue(aCx, result, aResult)) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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return NS_OK;
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}
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NS_IMPL_ISUPPORTS(JSStringEnumerator, nsIJSEnumerator)
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//
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// nsStringEnumeratorBase
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//
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nsresult nsStringEnumeratorBase::GetNext(nsAString& aResult) {
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nsAutoCString str;
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MOZ_TRY(GetNext(str));
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CopyUTF8toUTF16(str, aResult);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringEnumeratorBase::StringIterator(nsIJSEnumerator** aRetVal) {
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auto result = MakeRefPtr<JSStringEnumerator>(this);
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result.forget(aRetVal);
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return NS_OK;
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}
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//
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// nsStringEnumerator
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//
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class nsStringEnumerator final : public nsSimpleEnumerator,
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public nsIStringEnumerator,
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public nsIUTF8StringEnumerator {
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public:
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nsStringEnumerator(const nsTArray<nsString>* aArray, bool aOwnsArray)
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: mArray(aArray), mIndex(0), mOwnsArray(aOwnsArray), mIsUnicode(true) {}
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nsStringEnumerator(const nsTArray<nsCString>* aArray, bool aOwnsArray)
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: mCArray(aArray), mIndex(0), mOwnsArray(aOwnsArray), mIsUnicode(false) {}
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nsStringEnumerator(const nsTArray<nsString>* aArray, nsISupports* aOwner)
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: mArray(aArray),
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mIndex(0),
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mOwner(aOwner),
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mOwnsArray(false),
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mIsUnicode(true) {}
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nsStringEnumerator(const nsTArray<nsCString>* aArray, nsISupports* aOwner)
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: mCArray(aArray),
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mIndex(0),
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mOwner(aOwner),
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mOwnsArray(false),
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mIsUnicode(false) {}
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NS_DECL_ISUPPORTS_INHERITED
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NS_DECL_NSIUTF8STRINGENUMERATOR
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NS_DECL_NSISTRINGENUMERATORBASE
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// have to declare nsIStringEnumerator manually, because of
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// overlapping method names
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NS_IMETHOD GetNext(nsAString& aResult) override;
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NS_DECL_NSISIMPLEENUMERATOR
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const nsID& DefaultInterface() override {
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if (mIsUnicode) {
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return NS_GET_IID(nsISupportsString);
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}
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return NS_GET_IID(nsISupportsCString);
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}
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private:
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~nsStringEnumerator() {
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if (mOwnsArray) {
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// const-casting is safe here, because the NS_New*
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// constructors make sure mOwnsArray is consistent with
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// the constness of the objects
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if (mIsUnicode) {
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delete const_cast<nsTArray<nsString>*>(mArray);
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} else {
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delete const_cast<nsTArray<nsCString>*>(mCArray);
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}
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}
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}
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union {
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const nsTArray<nsString>* mArray;
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const nsTArray<nsCString>* mCArray;
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};
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inline uint32_t Count() {
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return mIsUnicode ? mArray->Length() : mCArray->Length();
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}
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uint32_t mIndex;
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// the owner allows us to hold a strong reference to the object
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// that owns the array. Having a non-null value in mOwner implies
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// that mOwnsArray is false, because we rely on the real owner
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// to release the array
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nsCOMPtr<nsISupports> mOwner;
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bool mOwnsArray;
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bool mIsUnicode;
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};
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NS_IMPL_ISUPPORTS_INHERITED(nsStringEnumerator, nsSimpleEnumerator,
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nsIStringEnumerator, nsIUTF8StringEnumerator)
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NS_IMETHODIMP
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nsStringEnumerator::HasMore(bool* aResult) {
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*aResult = mIndex < Count();
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringEnumerator::HasMoreElements(bool* aResult) { return HasMore(aResult); }
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NS_IMETHODIMP
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nsStringEnumerator::GetNext(nsISupports** aResult) {
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if (mIndex >= mArray->Length()) {
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return NS_ERROR_FAILURE;
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}
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if (mIsUnicode) {
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nsSupportsString* stringImpl = new nsSupportsString();
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stringImpl->SetData(mArray->ElementAt(mIndex++));
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*aResult = stringImpl;
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} else {
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nsSupportsCString* cstringImpl = new nsSupportsCString();
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cstringImpl->SetData(mCArray->ElementAt(mIndex++));
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*aResult = cstringImpl;
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}
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringEnumerator::GetNext(nsAString& aResult) {
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if (NS_WARN_IF(mIndex >= Count())) {
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return NS_ERROR_UNEXPECTED;
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}
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if (mIsUnicode) {
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aResult = mArray->ElementAt(mIndex++);
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} else {
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CopyUTF8toUTF16(mCArray->ElementAt(mIndex++), aResult);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringEnumerator::GetNext(nsACString& aResult) {
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if (NS_WARN_IF(mIndex >= Count())) {
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return NS_ERROR_UNEXPECTED;
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}
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if (mIsUnicode) {
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CopyUTF16toUTF8(mArray->ElementAt(mIndex++), aResult);
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} else {
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aResult = mCArray->ElementAt(mIndex++);
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}
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return NS_OK;
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}
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NS_IMETHODIMP
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nsStringEnumerator::StringIterator(nsIJSEnumerator** aRetVal) {
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auto result = MakeRefPtr<JSStringEnumerator>(this);
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result.forget(aRetVal);
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return NS_OK;
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}
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template <class T>
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static inline nsresult StringEnumeratorTail(T** aResult) {
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if (!*aResult) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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NS_ADDREF(*aResult);
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return NS_OK;
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}
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//
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// constructors
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//
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nsresult NS_NewStringEnumerator(nsIStringEnumerator** aResult,
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const nsTArray<nsString>* aArray,
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nsISupports* aOwner) {
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if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
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return NS_ERROR_INVALID_ARG;
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}
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*aResult = new nsStringEnumerator(aArray, aOwner);
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return StringEnumeratorTail(aResult);
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}
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nsresult NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
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const nsTArray<nsCString>* aArray,
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nsISupports* aOwner) {
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if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
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return NS_ERROR_INVALID_ARG;
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}
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*aResult = new nsStringEnumerator(aArray, aOwner);
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return StringEnumeratorTail(aResult);
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}
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nsresult NS_NewAdoptingStringEnumerator(nsIStringEnumerator** aResult,
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nsTArray<nsString>* aArray) {
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if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
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return NS_ERROR_INVALID_ARG;
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}
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*aResult = new nsStringEnumerator(aArray, true);
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return StringEnumeratorTail(aResult);
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}
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nsresult NS_NewAdoptingUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
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nsTArray<nsCString>* aArray) {
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if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
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return NS_ERROR_INVALID_ARG;
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}
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*aResult = new nsStringEnumerator(aArray, true);
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return StringEnumeratorTail(aResult);
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}
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// const ones internally just forward to the non-const equivalents
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nsresult NS_NewStringEnumerator(nsIStringEnumerator** aResult,
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const nsTArray<nsString>* aArray) {
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if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
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return NS_ERROR_INVALID_ARG;
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}
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*aResult = new nsStringEnumerator(aArray, false);
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return StringEnumeratorTail(aResult);
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}
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nsresult NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
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const nsTArray<nsCString>* aArray) {
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if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
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return NS_ERROR_INVALID_ARG;
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}
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*aResult = new nsStringEnumerator(aArray, false);
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return StringEnumeratorTail(aResult);
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}
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