Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 212 insertions, 0 deletions

diff --git a/dom/base/NodeIterator.cpp b/dom/base/NodeIterator.cpp
new file mode 100644
index 0000000000..146eae1da9
--- /dev/null
+++ b/dom/base/NodeIterator.cpp
@@ -0,0 +1,212 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * 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/. */
+
+/*
+ * Implementation of DOM Traversal's NodeIterator
+ */
+
+#include "mozilla/dom/NodeIterator.h"
+
+#include "nsError.h"
+
+#include "nsIContent.h"
+#include "mozilla/dom/Document.h"
+#include "nsContentUtils.h"
+#include "nsCOMPtr.h"
+#include "mozilla/dom/NodeFilterBinding.h"
+#include "mozilla/dom/NodeIteratorBinding.h"
+
+namespace mozilla::dom {
+
+/*
+ * NodePointer implementation
+ */
+NodeIterator::NodePointer::NodePointer(nsINode* aNode, bool aBeforeNode)
+    : mNode(aNode), mBeforeNode(aBeforeNode) {}
+
+bool NodeIterator::NodePointer::MoveToNext(nsINode* aRoot) {
+  if (!mNode) return false;
+
+  if (mBeforeNode) {
+    mBeforeNode = false;
+    return true;
+  }
+
+  nsINode* child = mNode->GetFirstChild();
+  if (child) {
+    mNode = child;
+    return true;
+  }
+
+  return MoveForward(aRoot, mNode);
+}
+
+bool NodeIterator::NodePointer::MoveToPrevious(nsINode* aRoot) {
+  if (!mNode) return false;
+
+  if (!mBeforeNode) {
+    mBeforeNode = true;
+    return true;
+  }
+
+  if (mNode == aRoot) return false;
+
+  MoveBackward(mNode->GetParentNode(), mNode->GetPreviousSibling());
+
+  return true;
+}
+
+void NodeIterator::NodePointer::AdjustAfterRemoval(
+    nsINode* aRoot, nsINode* aContainer, nsIContent* aChild,
+    nsIContent* aPreviousSibling) {
+  // If mNode is null or the root there is nothing to do.
+  if (!mNode || mNode == aRoot) return;
+
+  // check if ancestor was removed
+  if (!mNode->IsInclusiveDescendantOf(aChild)) return;
+
+  if (mBeforeNode) {
+    // Try the next sibling
+    nsINode* nextSibling = aPreviousSibling ? aPreviousSibling->GetNextSibling()
+                                            : aContainer->GetFirstChild();
+
+    if (nextSibling) {
+      mNode = nextSibling;
+      return;
+    }
+
+    // Next try siblings of ancestors
+    if (MoveForward(aRoot, aContainer)) return;
+
+    // No suitable node was found so try going backwards
+    mBeforeNode = false;
+  }
+
+  MoveBackward(aContainer, aPreviousSibling);
+}
+
+bool NodeIterator::NodePointer::MoveForward(nsINode* aRoot, nsINode* aNode) {
+  while (1) {
+    if (aNode == aRoot) break;
+
+    nsINode* sibling = aNode->GetNextSibling();
+    if (sibling) {
+      mNode = sibling;
+      return true;
+    }
+    aNode = aNode->GetParentNode();
+  }
+
+  return false;
+}
+
+void NodeIterator::NodePointer::MoveBackward(nsINode* aParent, nsINode* aNode) {
+  if (aNode) {
+    do {
+      mNode = aNode;
+      aNode = aNode->GetLastChild();
+    } while (aNode);
+  } else {
+    mNode = aParent;
+  }
+}
+
+/*
+ * Factories, constructors and destructors
+ */
+
+NodeIterator::NodeIterator(nsINode* aRoot, uint32_t aWhatToShow,
+                           NodeFilter* aFilter)
+    : nsTraversal(aRoot, aWhatToShow, aFilter), mPointer(mRoot, true) {
+  aRoot->AddMutationObserver(this);
+}
+
+NodeIterator::~NodeIterator() {
+  /* destructor code */
+  if (mRoot) mRoot->RemoveMutationObserver(this);
+}
+
+/*
+ * nsISupports and cycle collection stuff
+ */
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(NodeIterator)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(NodeIterator)
+  if (tmp->mRoot) tmp->mRoot->RemoveMutationObserver(tmp);
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mRoot)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mFilter)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(NodeIterator)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mRoot)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mFilter)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+// QueryInterface implementation for NodeIterator
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(NodeIterator)
+  NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(NodeIterator)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(NodeIterator)
+
+already_AddRefed<nsINode> NodeIterator::NextOrPrevNode(
+    NodePointer::MoveToMethodType aMove, ErrorResult& aResult) {
+  if (mInAcceptNode) {
+    aResult.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
+    return nullptr;
+  }
+
+  mWorkingPointer = mPointer;
+
+  struct AutoClear {
+    NodePointer* mPtr;
+    explicit AutoClear(NodePointer* ptr) : mPtr(ptr) {}
+    ~AutoClear() { mPtr->Clear(); }
+  } ac(&mWorkingPointer);
+
+  while ((mWorkingPointer.*aMove)(mRoot)) {
+    nsCOMPtr<nsINode> testNode;
+    int16_t filtered = TestNode(mWorkingPointer.mNode, aResult, &testNode);
+    if (aResult.Failed()) {
+      return nullptr;
+    }
+
+    if (filtered == NodeFilter_Binding::FILTER_ACCEPT) {
+      mPointer = mWorkingPointer;
+      return testNode.forget();
+    }
+  }
+
+  return nullptr;
+}
+
+void NodeIterator::Detach() {
+  if (mRoot) {
+    mRoot->OwnerDoc()->WarnOnceAbout(DeprecatedOperations::eNodeIteratorDetach);
+  }
+}
+
+/*
+ * nsIMutationObserver interface
+ */
+
+void NodeIterator::ContentRemoved(nsIContent* aChild,
+                                  nsIContent* aPreviousSibling) {
+  nsINode* container = aChild->GetParentNode();
+
+  mPointer.AdjustAfterRemoval(mRoot, container, aChild, aPreviousSibling);
+  mWorkingPointer.AdjustAfterRemoval(mRoot, container, aChild,
+                                     aPreviousSibling);
+}
+
+bool NodeIterator::WrapObject(JSContext* cx, JS::Handle<JSObject*> aGivenProto,
+                              JS::MutableHandle<JSObject*> aReflector) {
+  return NodeIterator_Binding::Wrap(cx, this, aGivenProto, aReflector);
+}
+
+}  // namespace mozilla::dom