mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-10 11:54:40 +00:00
263 lines
6.1 KiB
C++
263 lines
6.1 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 "nsISimpleEnumerator.h"
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#include "nsSupportsPrimitives.h"
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#include "mozilla/Attributes.h"
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#include "nsTArray.h"
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//
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// nsStringEnumerator
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//
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class nsStringEnumerator final
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: public nsIStringEnumerator
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, public nsIUTF8StringEnumerator
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, public nsISimpleEnumerator
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{
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public:
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nsStringEnumerator(const nsTArray<nsString>* aArray, bool aOwnsArray)
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: mArray(aArray)
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, mIndex(0)
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, mOwnsArray(aOwnsArray)
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, mIsUnicode(true)
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{}
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nsStringEnumerator(const nsTArray<nsCString>* aArray, bool aOwnsArray)
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: mCArray(aArray)
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, mIndex(0)
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, mOwnsArray(aOwnsArray)
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, mIsUnicode(false)
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{}
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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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{}
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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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{}
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NS_DECL_ISUPPORTS
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NS_DECL_NSIUTF8STRINGENUMERATOR
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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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private:
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~nsStringEnumerator()
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{
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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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{
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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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{
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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(nsStringEnumerator,
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nsIStringEnumerator,
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nsIUTF8StringEnumerator,
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nsISimpleEnumerator)
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NS_IMETHODIMP
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nsStringEnumerator::HasMore(bool* aResult)
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{
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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)
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{
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return HasMore(aResult);
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}
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NS_IMETHODIMP
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nsStringEnumerator::GetNext(nsISupports** aResult)
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{
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if (mIsUnicode) {
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nsSupportsStringImpl* stringImpl = new nsSupportsStringImpl();
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if (!stringImpl) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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stringImpl->SetData(mArray->ElementAt(mIndex++));
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*aResult = stringImpl;
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} else {
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nsSupportsCStringImpl* cstringImpl = new nsSupportsCStringImpl();
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if (!cstringImpl) {
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return NS_ERROR_OUT_OF_MEMORY;
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}
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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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{
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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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{
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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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template<class T>
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static inline nsresult
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StringEnumeratorTail(T** aResult)
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{
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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
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NS_NewStringEnumerator(nsIStringEnumerator** aResult,
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const nsTArray<nsString>* aArray, nsISupports* aOwner)
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{
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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
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NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
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const nsTArray<nsCString>* aArray,
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nsISupports* aOwner)
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{
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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
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NS_NewAdoptingStringEnumerator(nsIStringEnumerator** aResult,
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nsTArray<nsString>* aArray)
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{
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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
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NS_NewAdoptingUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
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nsTArray<nsCString>* aArray)
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{
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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
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NS_NewStringEnumerator(nsIStringEnumerator** aResult,
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const nsTArray<nsString>* aArray)
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{
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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
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NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
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const nsTArray<nsCString>* aArray)
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{
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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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