1 files changed, 156 insertions, 0 deletions
diff --git a/dom/xslt/xpath/XPathResult.h b/dom/xslt/xpath/XPathResult.h
new file mode 100644
index 0000000000..e073666a84
--- /dev/null
+++ b/dom/xslt/xpath/XPathResult.h
@@ -0,0 +1,156 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_XPathResult_h
+#define mozilla_dom_XPathResult_h
+
+#include "nsStubMutationObserver.h"
+#include "nsCOMPtr.h"
+#include "nsCycleCollectionParticipant.h"
+#include "nsIWeakReferenceUtils.h"
+#include "nsTArray.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/ErrorResult.h"
+#include "nsString.h"
+#include "nsWrapperCache.h"
+#include "nsINode.h"
+
+class txAExprResult;
+
+namespace mozilla::dom {
+
+/**
+ * A class for evaluating an XPath expression string
+ */
+class XPathResult final : public nsStubMutationObserver, public nsWrapperCache {
+  ~XPathResult();
+
+ public:
+  explicit XPathResult(nsINode* aParent);
+  XPathResult(const XPathResult& aResult);
+
+  enum {
+    ANY_TYPE = 0U,
+    NUMBER_TYPE = 1U,
+    STRING_TYPE = 2U,
+    BOOLEAN_TYPE = 3U,
+    UNORDERED_NODE_ITERATOR_TYPE = 4U,
+    ORDERED_NODE_ITERATOR_TYPE = 5U,
+    UNORDERED_NODE_SNAPSHOT_TYPE = 6U,
+    ORDERED_NODE_SNAPSHOT_TYPE = 7U,
+    ANY_UNORDERED_NODE_TYPE = 8U,
+    FIRST_ORDERED_NODE_TYPE = 9U
+  };
+
+  // nsISupports interface
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_WRAPPERCACHE_CLASS(XPathResult)
+
+  virtual JSObject* WrapObject(JSContext* aCx,
+                               JS::Handle<JSObject*> aGivenProto) override;
+  nsINode* GetParentObject() const { return mParent; }
+  uint16_t ResultType() const { return mResultType; }
+  double GetNumberValue(ErrorResult& aRv) const {
+    if (mResultType != NUMBER_TYPE) {
+      aRv.ThrowTypeError("Result is not a number");
+      return 0;
+    }
+
+    return mNumberResult;
+  }
+  void GetStringValue(nsAString& aStringValue, ErrorResult& aRv) const {
+    if (mResultType != STRING_TYPE) {
+      aRv.ThrowTypeError("Result is not a string");
+      return;
+    }
+
+    aStringValue = mStringResult;
+  }
+  bool GetBooleanValue(ErrorResult& aRv) const {
+    if (mResultType != BOOLEAN_TYPE) {
+      aRv.ThrowTypeError("Result is not a boolean");
+      return false;
+    }
+
+    return mBooleanResult;
+  }
+  nsINode* GetSingleNodeValue(ErrorResult& aRv) const {
+    if (!isNode()) {
+      aRv.ThrowTypeError("Result is not a node");
+      return nullptr;
+    }
+
+    return mResultNodes.SafeElementAt(0);
+  }
+  bool InvalidIteratorState() const {
+    return isIterator() && mInvalidIteratorState;
+  }
+  uint32_t GetSnapshotLength(ErrorResult& aRv) const {
+    if (!isSnapshot()) {
+      aRv.ThrowTypeError("Result is not a snapshot");
+      return 0;
+    }
+
+    return (uint32_t)mResultNodes.Length();
+  }
+  nsINode* IterateNext(ErrorResult& aRv);
+  nsINode* SnapshotItem(uint32_t aIndex, ErrorResult& aRv) const {
+    if (!isSnapshot()) {
+      aRv.ThrowTypeError("Result is not a snapshot");
+      return nullptr;
+    }
+
+    return mResultNodes.SafeElementAt(aIndex);
+  }
+
+  // nsIMutationObserver interface
+  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED
+  NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED
+
+  void SetExprResult(txAExprResult* aExprResult, uint16_t aResultType,
+                     nsINode* aContextNode, ErrorResult& aRv);
+  nsresult GetExprResult(txAExprResult** aExprResult);
+  already_AddRefed<XPathResult> Clone(ErrorResult& aError);
+  void RemoveObserver();
+
+ private:
+  static bool isSnapshot(uint16_t aResultType) {
+    return aResultType == UNORDERED_NODE_SNAPSHOT_TYPE ||
+           aResultType == ORDERED_NODE_SNAPSHOT_TYPE;
+  }
+  static bool isIterator(uint16_t aResultType) {
+    return aResultType == UNORDERED_NODE_ITERATOR_TYPE ||
+           aResultType == ORDERED_NODE_ITERATOR_TYPE;
+  }
+  static bool isNode(uint16_t aResultType) {
+    return aResultType == FIRST_ORDERED_NODE_TYPE ||
+           aResultType == ANY_UNORDERED_NODE_TYPE;
+  }
+  bool isSnapshot() const { return isSnapshot(mResultType); }
+  bool isIterator() const { return isIterator(mResultType); }
+  bool isNode() const { return isNode(mResultType); }
+
+  void Invalidate(const nsIContent* aChangeRoot);
+
+  nsCOMPtr<nsINode> mParent;
+  RefPtr<txAExprResult> mResult;
+  nsTArray<nsCOMPtr<nsINode>> mResultNodes;
+  RefPtr<Document> mDocument;
+  nsWeakPtr mContextNode;
+  uint32_t mCurrentPos;
+  uint16_t mResultType;
+  bool mInvalidIteratorState;
+  bool mBooleanResult;
+  double mNumberResult;
+  nsString mStringResult;
+};
+
+}  // namespace mozilla::dom
+
+#endif /* mozilla_dom_XPathResult_h */