1 files changed, 264 insertions, 0 deletions
diff --git a/dom/xslt/xpath/XPathResult.cpp b/dom/xslt/xpath/XPathResult.cpp
new file mode 100644
index 0000000000..091a83528f
--- /dev/null
+++ b/dom/xslt/xpath/XPathResult.cpp
@@ -0,0 +1,264 @@
+/* -*- 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/. */
+
+#include "XPathResult.h"
+#include "txExprResult.h"
+#include "txNodeSet.h"
+#include "nsError.h"
+#include "mozilla/dom/Attr.h"
+#include "mozilla/dom/Element.h"
+#include "nsDOMString.h"
+#include "txXPathTreeWalker.h"
+#include "nsCycleCollectionParticipant.h"
+#include "mozilla/dom/XPathResultBinding.h"
+
+namespace mozilla::dom {
+
+XPathResult::XPathResult(nsINode* aParent)
+    : mParent(aParent),
+      mDocument(nullptr),
+      mCurrentPos(0),
+      mResultType(ANY_TYPE),
+      mInvalidIteratorState(true),
+      mBooleanResult(false),
+      mNumberResult(0) {}
+
+XPathResult::XPathResult(const XPathResult& aResult)
+    : mParent(aResult.mParent),
+      mResult(aResult.mResult),
+      mResultNodes(aResult.mResultNodes.Clone()),
+      mDocument(aResult.mDocument),
+      mContextNode(aResult.mContextNode),
+      mCurrentPos(0),
+      mResultType(aResult.mResultType),
+      mInvalidIteratorState(aResult.mInvalidIteratorState),
+      mBooleanResult(aResult.mBooleanResult),
+      mNumberResult(aResult.mNumberResult),
+      mStringResult(aResult.mStringResult) {
+  if (mDocument) {
+    mDocument->AddMutationObserver(this);
+  }
+}
+
+XPathResult::~XPathResult() { RemoveObserver(); }
+
+NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(XPathResult)
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(XPathResult)
+  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mParent) { tmp->RemoveObserver(); }
+  NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument)
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(XPathResult)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mParent)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument)
+  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mResultNodes)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(XPathResult)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(XPathResult)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(XPathResult)
+  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
+  NS_INTERFACE_MAP_ENTRY(nsIMutationObserver)
+  NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+JSObject* XPathResult::WrapObject(JSContext* aCx,
+                                  JS::Handle<JSObject*> aGivenProto) {
+  return XPathResult_Binding::Wrap(aCx, this, aGivenProto);
+}
+
+void XPathResult::RemoveObserver() {
+  if (mDocument) {
+    mDocument->RemoveMutationObserver(this);
+  }
+}
+
+nsINode* XPathResult::IterateNext(ErrorResult& aRv) {
+  if (!isIterator()) {
+    aRv.ThrowTypeError("Result is not an iterator");
+    return nullptr;
+  }
+
+  if (mDocument) {
+    mDocument->FlushPendingNotifications(FlushType::Content);
+  }
+
+  if (mInvalidIteratorState) {
+    aRv.ThrowInvalidStateError(
+        "The document has been mutated since the result was returned");
+    return nullptr;
+  }
+
+  return mResultNodes.SafeElementAt(mCurrentPos++);
+}
+
+void XPathResult::NodeWillBeDestroyed(nsINode* aNode) {
+  nsCOMPtr<nsIMutationObserver> kungFuDeathGrip(this);
+  // Set to null to avoid unregistring unnecessarily
+  mDocument = nullptr;
+  Invalidate(aNode->IsContent() ? aNode->AsContent() : nullptr);
+}
+
+void XPathResult::CharacterDataChanged(nsIContent* aContent,
+                                       const CharacterDataChangeInfo&) {
+  Invalidate(aContent);
+}
+
+void XPathResult::AttributeChanged(Element* aElement, int32_t aNameSpaceID,
+                                   nsAtom* aAttribute, int32_t aModType,
+                                   const nsAttrValue* aOldValue) {
+  Invalidate(aElement);
+}
+
+void XPathResult::ContentAppended(nsIContent* aFirstNewContent) {
+  Invalidate(aFirstNewContent->GetParent());
+}
+
+void XPathResult::ContentInserted(nsIContent* aChild) {
+  Invalidate(aChild->GetParent());
+}
+
+void XPathResult::ContentRemoved(nsIContent* aChild,
+                                 nsIContent* aPreviousSibling) {
+  Invalidate(aChild->GetParent());
+}
+
+void XPathResult::SetExprResult(txAExprResult* aExprResult,
+                                uint16_t aResultType, nsINode* aContextNode,
+                                ErrorResult& aRv) {
+  MOZ_ASSERT(aExprResult);
+
+  if ((isSnapshot(aResultType) || isIterator(aResultType) ||
+       isNode(aResultType)) &&
+      aExprResult->getResultType() != txAExprResult::NODESET) {
+    // The DOM spec doesn't really say what should happen when reusing an
+    // XPathResult and an error is thrown. Let's not touch the XPathResult
+    // in that case.
+    aRv.ThrowTypeError("Result type mismatch");
+    return;
+  }
+
+  mResultType = aResultType;
+  mContextNode = do_GetWeakReference(aContextNode);
+
+  if (mDocument) {
+    mDocument->RemoveMutationObserver(this);
+    mDocument = nullptr;
+  }
+
+  mResultNodes.Clear();
+
+  // XXX This will keep the recycler alive, should we clear it?
+  mResult = aExprResult;
+  switch (mResultType) {
+    case BOOLEAN_TYPE: {
+      mBooleanResult = mResult->booleanValue();
+      break;
+    }
+    case NUMBER_TYPE: {
+      mNumberResult = mResult->numberValue();
+      break;
+    }
+    case STRING_TYPE: {
+      mResult->stringValue(mStringResult);
+      break;
+    }
+    default: {
+      MOZ_ASSERT(isNode() || isIterator() || isSnapshot());
+    }
+  }
+
+  if (aExprResult->getResultType() == txAExprResult::NODESET) {
+    txNodeSet* nodeSet = static_cast<txNodeSet*>(aExprResult);
+    int32_t i, count = nodeSet->size();
+    for (i = 0; i < count; ++i) {
+      nsINode* node = txXPathNativeNode::getNode(nodeSet->get(i));
+      mResultNodes.AppendElement(node);
+    }
+
+    if (count > 0) {
+      mResult = nullptr;
+    }
+  }
+
+  if (!isIterator()) {
+    return;
+  }
+
+  mCurrentPos = 0;
+  mInvalidIteratorState = false;
+
+  if (!mResultNodes.IsEmpty()) {
+    // If we support the document() function in DOM-XPath we need to
+    // observe all documents that we have resultnodes in.
+    mDocument = mResultNodes[0]->OwnerDoc();
+    NS_ASSERTION(mDocument, "We need a document!");
+    if (mDocument) {
+      mDocument->AddMutationObserver(this);
+    }
+  }
+}
+
+void XPathResult::Invalidate(const nsIContent* aChangeRoot) {
+  nsCOMPtr<nsINode> contextNode = do_QueryReferent(mContextNode);
+  // If the changes are happening in a different anonymous trees, no
+  // invalidation should happen.
+  if (contextNode && aChangeRoot &&
+      !nsContentUtils::IsInSameAnonymousTree(contextNode, aChangeRoot)) {
+    return;
+  }
+
+  mInvalidIteratorState = true;
+  // Make sure nulling out mDocument is the last thing we do.
+  if (mDocument) {
+    mDocument->RemoveMutationObserver(this);
+    mDocument = nullptr;
+  }
+}
+
+nsresult XPathResult::GetExprResult(txAExprResult** aExprResult) {
+  if (isIterator() && mInvalidIteratorState) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  if (mResult) {
+    NS_ADDREF(*aExprResult = mResult);
+
+    return NS_OK;
+  }
+
+  if (mResultNodes.IsEmpty()) {
+    return NS_ERROR_DOM_INVALID_STATE_ERR;
+  }
+
+  RefPtr<txNodeSet> nodeSet = new txNodeSet(nullptr);
+  uint32_t i, count = mResultNodes.Length();
+  for (i = 0; i < count; ++i) {
+    UniquePtr<txXPathNode> node(
+        txXPathNativeNode::createXPathNode(mResultNodes[i]));
+    if (!node) {
+      return NS_ERROR_OUT_OF_MEMORY;
+    }
+
+    nodeSet->append(*node);
+  }
+
+  NS_ADDREF(*aExprResult = nodeSet);
+
+  return NS_OK;
+}
+
+already_AddRefed<XPathResult> XPathResult::Clone(ErrorResult& aError) {
+  if (isIterator() && mInvalidIteratorState) {
+    aError = NS_ERROR_DOM_INVALID_STATE_ERR;
+    return nullptr;
+  }
+
+  return do_AddRef(new XPathResult(*this));
+}
+
+}  // namespace mozilla::dom