Adding upstream version 86.0.1.upstream/86.0.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 311 insertions, 0 deletions

diff --git a/xpcom/ds/nsStringEnumerator.cpp b/xpcom/ds/nsStringEnumerator.cpp
new file mode 100644
index 0000000000..7b8cf72d00
--- /dev/null
+++ b/xpcom/ds/nsStringEnumerator.cpp
@@ -0,0 +1,311 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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 "nsStringEnumerator.h"
+#include "nsSimpleEnumerator.h"
+#include "nsSupportsPrimitives.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/ResultExtensions.h"
+#include "mozilla/dom/IteratorResultBinding.h"
+#include "mozilla/dom/RootedDictionary.h"
+#include "mozilla/dom/ToJSValue.h"
+#include "nsTArray.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+namespace {
+
+class JSStringEnumerator final : public nsIJSEnumerator {
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSIJSENUMERATOR
+
+  explicit JSStringEnumerator(nsIStringEnumerator* aEnumerator)
+      : mEnumerator(aEnumerator) {
+    MOZ_ASSERT(mEnumerator);
+  }
+
+ private:
+  ~JSStringEnumerator() = default;
+
+  nsCOMPtr<nsIStringEnumerator> mEnumerator;
+};
+
+}  // anonymous namespace
+
+nsresult JSStringEnumerator::Iterator(nsIJSEnumerator** aResult) {
+  RefPtr<JSStringEnumerator> result(this);
+  result.forget(aResult);
+  return NS_OK;
+}
+
+nsresult JSStringEnumerator::Next(JSContext* aCx,
+                                  JS::MutableHandleValue aResult) {
+  RootedDictionary<IteratorResult> result(aCx);
+
+  nsAutoString elem;
+  if (NS_FAILED(mEnumerator->GetNext(elem))) {
+    result.mDone = true;
+  } else {
+    result.mDone = false;
+
+    if (!ToJSValue(
+            aCx, elem,
+            JS::MutableHandleValue::fromMarkedLocation(&result.mValue))) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+  }
+
+  if (!ToJSValue(aCx, result, aResult)) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  return NS_OK;
+}
+
+NS_IMPL_ISUPPORTS(JSStringEnumerator, nsIJSEnumerator)
+
+//
+// nsStringEnumeratorBase
+//
+
+nsresult nsStringEnumeratorBase::GetNext(nsAString& aResult) {
+  nsAutoCString str;
+  MOZ_TRY(GetNext(str));
+
+  CopyUTF8toUTF16(str, aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringEnumeratorBase::StringIterator(nsIJSEnumerator** aRetVal) {
+  auto result = MakeRefPtr<JSStringEnumerator>(this);
+  result.forget(aRetVal);
+  return NS_OK;
+}
+
+//
+// nsStringEnumerator
+//
+
+class nsStringEnumerator final : public nsSimpleEnumerator,
+                                 public nsIStringEnumerator,
+                                 public nsIUTF8StringEnumerator {
+ public:
+  nsStringEnumerator(const nsTArray<nsString>* aArray, bool aOwnsArray)
+      : mArray(aArray), mIndex(0), mOwnsArray(aOwnsArray), mIsUnicode(true) {}
+
+  nsStringEnumerator(const nsTArray<nsCString>* aArray, bool aOwnsArray)
+      : mCArray(aArray), mIndex(0), mOwnsArray(aOwnsArray), mIsUnicode(false) {}
+
+  nsStringEnumerator(const nsTArray<nsString>* aArray, nsISupports* aOwner)
+      : mArray(aArray),
+        mIndex(0),
+        mOwner(aOwner),
+        mOwnsArray(false),
+        mIsUnicode(true) {}
+
+  nsStringEnumerator(const nsTArray<nsCString>* aArray, nsISupports* aOwner)
+      : mCArray(aArray),
+        mIndex(0),
+        mOwner(aOwner),
+        mOwnsArray(false),
+        mIsUnicode(false) {}
+
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_NSIUTF8STRINGENUMERATOR
+  NS_DECL_NSISTRINGENUMERATORBASE
+
+  // have to declare nsIStringEnumerator manually, because of
+  // overlapping method names
+  NS_IMETHOD GetNext(nsAString& aResult) override;
+  NS_DECL_NSISIMPLEENUMERATOR
+
+  const nsID& DefaultInterface() override {
+    if (mIsUnicode) {
+      return NS_GET_IID(nsISupportsString);
+    }
+    return NS_GET_IID(nsISupportsCString);
+  }
+
+ private:
+  ~nsStringEnumerator() {
+    if (mOwnsArray) {
+      // const-casting is safe here, because the NS_New*
+      // constructors make sure mOwnsArray is consistent with
+      // the constness of the objects
+      if (mIsUnicode) {
+        delete const_cast<nsTArray<nsString>*>(mArray);
+      } else {
+        delete const_cast<nsTArray<nsCString>*>(mCArray);
+      }
+    }
+  }
+
+  union {
+    const nsTArray<nsString>* mArray;
+    const nsTArray<nsCString>* mCArray;
+  };
+
+  inline uint32_t Count() {
+    return mIsUnicode ? mArray->Length() : mCArray->Length();
+  }
+
+  uint32_t mIndex;
+
+  // the owner allows us to hold a strong reference to the object
+  // that owns the array. Having a non-null value in mOwner implies
+  // that mOwnsArray is false, because we rely on the real owner
+  // to release the array
+  nsCOMPtr<nsISupports> mOwner;
+  bool mOwnsArray;
+  bool mIsUnicode;
+};
+
+NS_IMPL_ISUPPORTS_INHERITED(nsStringEnumerator, nsSimpleEnumerator,
+                            nsIStringEnumerator, nsIUTF8StringEnumerator)
+
+NS_IMETHODIMP
+nsStringEnumerator::HasMore(bool* aResult) {
+  *aResult = mIndex < Count();
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringEnumerator::HasMoreElements(bool* aResult) { return HasMore(aResult); }
+
+NS_IMETHODIMP
+nsStringEnumerator::GetNext(nsISupports** aResult) {
+  if (mIndex >= mArray->Length()) {
+    return NS_ERROR_FAILURE;
+  }
+
+  if (mIsUnicode) {
+    nsSupportsString* stringImpl = new nsSupportsString();
+
+    stringImpl->SetData(mArray->ElementAt(mIndex++));
+    *aResult = stringImpl;
+  } else {
+    nsSupportsCString* cstringImpl = new nsSupportsCString();
+
+    cstringImpl->SetData(mCArray->ElementAt(mIndex++));
+    *aResult = cstringImpl;
+  }
+  NS_ADDREF(*aResult);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringEnumerator::GetNext(nsAString& aResult) {
+  if (NS_WARN_IF(mIndex >= Count())) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  if (mIsUnicode) {
+    aResult = mArray->ElementAt(mIndex++);
+  } else {
+    CopyUTF8toUTF16(mCArray->ElementAt(mIndex++), aResult);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringEnumerator::GetNext(nsACString& aResult) {
+  if (NS_WARN_IF(mIndex >= Count())) {
+    return NS_ERROR_UNEXPECTED;
+  }
+
+  if (mIsUnicode) {
+    CopyUTF16toUTF8(mArray->ElementAt(mIndex++), aResult);
+  } else {
+    aResult = mCArray->ElementAt(mIndex++);
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsStringEnumerator::StringIterator(nsIJSEnumerator** aRetVal) {
+  auto result = MakeRefPtr<JSStringEnumerator>(this);
+  result.forget(aRetVal);
+  return NS_OK;
+}
+
+template <class T>
+static inline nsresult StringEnumeratorTail(T** aResult) {
+  if (!*aResult) {
+    return NS_ERROR_OUT_OF_MEMORY;
+  }
+  NS_ADDREF(*aResult);
+  return NS_OK;
+}
+
+//
+// constructors
+//
+
+nsresult NS_NewStringEnumerator(nsIStringEnumerator** aResult,
+                                const nsTArray<nsString>* aArray,
+                                nsISupports* aOwner) {
+  if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  *aResult = new nsStringEnumerator(aArray, aOwner);
+  return StringEnumeratorTail(aResult);
+}
+
+nsresult NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
+                                    const nsTArray<nsCString>* aArray,
+                                    nsISupports* aOwner) {
+  if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  *aResult = new nsStringEnumerator(aArray, aOwner);
+  return StringEnumeratorTail(aResult);
+}
+
+nsresult NS_NewAdoptingStringEnumerator(nsIStringEnumerator** aResult,
+                                        nsTArray<nsString>* aArray) {
+  if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  *aResult = new nsStringEnumerator(aArray, true);
+  return StringEnumeratorTail(aResult);
+}
+
+nsresult NS_NewAdoptingUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
+                                            nsTArray<nsCString>* aArray) {
+  if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  *aResult = new nsStringEnumerator(aArray, true);
+  return StringEnumeratorTail(aResult);
+}
+
+// const ones internally just forward to the non-const equivalents
+nsresult NS_NewStringEnumerator(nsIStringEnumerator** aResult,
+                                const nsTArray<nsString>* aArray) {
+  if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  *aResult = new nsStringEnumerator(aArray, false);
+  return StringEnumeratorTail(aResult);
+}
+
+nsresult NS_NewUTF8StringEnumerator(nsIUTF8StringEnumerator** aResult,
+                                    const nsTArray<nsCString>* aArray) {
+  if (NS_WARN_IF(!aResult) || NS_WARN_IF(!aArray)) {
+    return NS_ERROR_INVALID_ARG;
+  }
+
+  *aResult = new nsStringEnumerator(aArray, false);
+  return StringEnumeratorTail(aResult);
+}