Source code
Revision control
Copy as Markdown
Other Tools
/* -*- 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
#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 */