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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* 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 "mozilla/dom/XPathEvaluator.h"
#include "mozilla/Move.h"
#include "nsCOMPtr.h"
#include "nsIAtom.h"
#include "mozilla/dom/XPathExpression.h"
#include "XPathResult.h"
#include "nsContentCID.h"
#include "txExpr.h"
#include "txExprParser.h"
#include "nsError.h"
#include "txURIUtils.h"
#include "nsIDocument.h"
#include "nsIDOMDocument.h"
#include "nsDOMString.h"
#include "nsNameSpaceManager.h"
#include "nsContentUtils.h"
#include "txIXPathContext.h"
#include "mozilla/dom/XPathEvaluatorBinding.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/XPathNSResolverBinding.h"
extern nsresult
TX_ResolveFunctionCallXPCOM(const nsCString &aContractID, int32_t aNamespaceID,
nsIAtom *aName, nsISupports *aState,
FunctionCall **aFunction);
namespace mozilla {
namespace dom {
// txIParseContext implementation
class XPathEvaluatorParseContext : public txIParseContext
{
public:
XPathEvaluatorParseContext(XPathNSResolver* aResolver,
bool aIsCaseSensitive)
: mResolver(aResolver),
mResolverNode(nullptr),
mLastError(NS_OK),
mIsCaseSensitive(aIsCaseSensitive)
{
}
XPathEvaluatorParseContext(nsINode* aResolver,
bool aIsCaseSensitive)
: mResolver(nullptr),
mResolverNode(aResolver),
mLastError(NS_OK),
mIsCaseSensitive(aIsCaseSensitive)
{
}
nsresult getError()
{
return mLastError;
}
nsresult resolveNamespacePrefix(nsIAtom* aPrefix, int32_t& aID);
nsresult resolveFunctionCall(nsIAtom* aName, int32_t aID,
FunctionCall** aFunction);
bool caseInsensitiveNameTests();
void SetErrorOffset(uint32_t aOffset);
private:
XPathNSResolver* mResolver;
nsINode* mResolverNode;
nsresult mLastError;
bool mIsCaseSensitive;
};
NS_IMPL_ISUPPORTS(XPathEvaluator, nsIDOMXPathEvaluator)
XPathEvaluator::XPathEvaluator(nsIDocument* aDocument)
: mDocument(do_GetWeakReference(aDocument))
{
}
XPathEvaluator::~XPathEvaluator()
{
}
NS_IMETHODIMP
XPathEvaluator::Evaluate(const nsAString & aExpression,
nsIDOMNode *aContextNode,
nsIDOMNode *aResolver,
uint16_t aType,
nsISupports *aInResult,
nsISupports **aResult)
{
nsCOMPtr<nsINode> resolver = do_QueryInterface(aResolver);
ErrorResult rv;
nsAutoPtr<XPathExpression> expression(CreateExpression(aExpression,
resolver, rv));
if (rv.Failed()) {
return rv.StealNSResult();
}
nsCOMPtr<nsINode> node = do_QueryInterface(aContextNode);
if (!node) {
return NS_ERROR_FAILURE;
}
nsCOMPtr<nsIXPathResult> inResult = do_QueryInterface(aInResult);
RefPtr<XPathResult> result =
expression->Evaluate(*node, aType,
static_cast<XPathResult*>(inResult.get()), rv);
if (rv.Failed()) {
return rv.StealNSResult();
}
*aResult = ToSupports(result.forget().take());
return NS_OK;
}
XPathExpression*
XPathEvaluator::CreateExpression(const nsAString& aExpression,
XPathNSResolver* aResolver, ErrorResult& aRv)
{
nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocument);
XPathEvaluatorParseContext pContext(aResolver,
!(doc && doc->IsHTMLDocument()));
return CreateExpression(aExpression, &pContext, doc, aRv);
}
XPathExpression*
XPathEvaluator::CreateExpression(const nsAString& aExpression,
nsINode* aResolver, ErrorResult& aRv)
{
nsCOMPtr<nsIDocument> doc = do_QueryReferent(mDocument);
XPathEvaluatorParseContext pContext(aResolver,
!(doc && doc->IsHTMLDocument()));
return CreateExpression(aExpression, &pContext, doc, aRv);
}
XPathExpression*
XPathEvaluator::CreateExpression(const nsAString & aExpression,
txIParseContext* aContext,
nsIDocument* aDocument,
ErrorResult& aRv)
{
if (!mRecycler) {
mRecycler = new txResultRecycler;
}
nsAutoPtr<Expr> expression;
aRv = txExprParser::createExpr(PromiseFlatString(aExpression), aContext,
getter_Transfers(expression));
if (aRv.Failed()) {
if (!aRv.ErrorCodeIs(NS_ERROR_DOM_NAMESPACE_ERR)) {
aRv.SuppressException();
aRv.Throw(NS_ERROR_DOM_INVALID_EXPRESSION_ERR);
}
return nullptr;
}
return new XPathExpression(Move(expression), mRecycler, aDocument);
}
bool
XPathEvaluator::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto,
JS::MutableHandle<JSObject*> aReflector)
{
return dom::XPathEvaluatorBinding::Wrap(aCx, this, aGivenProto, aReflector);
}
/* static */
already_AddRefed<XPathEvaluator>
XPathEvaluator::Constructor(const GlobalObject& aGlobal,
ErrorResult& rv)
{
RefPtr<XPathEvaluator> newObj = new XPathEvaluator(nullptr);
return newObj.forget();
}
already_AddRefed<XPathResult>
XPathEvaluator::Evaluate(JSContext* aCx, const nsAString& aExpression,
nsINode& aContextNode, XPathNSResolver* aResolver,
uint16_t aType, JS::Handle<JSObject*> aResult,
ErrorResult& rv)
{
nsAutoPtr<XPathExpression> expression(CreateExpression(aExpression,
aResolver, rv));
if (rv.Failed()) {
return nullptr;
}
return expression->Evaluate(aCx, aContextNode, aType, aResult, rv);
}
/*
* Implementation of txIParseContext private to XPathEvaluator, based on a
* XPathNSResolver
*/
nsresult XPathEvaluatorParseContext::resolveNamespacePrefix
(nsIAtom* aPrefix, int32_t& aID)
{
aID = kNameSpaceID_Unknown;
if (!mResolver && !mResolverNode) {
return NS_ERROR_DOM_NAMESPACE_ERR;
}
nsAutoString prefix;
if (aPrefix) {
aPrefix->ToString(prefix);
}
nsVoidableString ns;
if (mResolver) {
ErrorResult rv;
mResolver->LookupNamespaceURI(prefix, ns, rv);
if (rv.Failed()) {
return rv.StealNSResult();
}
} else {
if (aPrefix == nsGkAtoms::xml) {
ns.AssignLiteral("http://www.w3.org/XML/1998/namespace");
} else {
mResolverNode->LookupNamespaceURI(prefix, ns);
}
}
if (DOMStringIsNull(ns)) {
return NS_ERROR_DOM_NAMESPACE_ERR;
}
if (ns.IsEmpty()) {
aID = kNameSpaceID_None;
return NS_OK;
}
// get the namespaceID for the URI
return nsContentUtils::NameSpaceManager()->RegisterNameSpace(ns, aID);
}
nsresult
XPathEvaluatorParseContext::resolveFunctionCall(nsIAtom* aName,
int32_t aID,
FunctionCall** aFn)
{
return NS_ERROR_XPATH_UNKNOWN_FUNCTION;
}
bool XPathEvaluatorParseContext::caseInsensitiveNameTests()
{
return !mIsCaseSensitive;
}
void
XPathEvaluatorParseContext::SetErrorOffset(uint32_t aOffset)
{
}
} // namespace dom
} // namespace mozilla
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