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/* -*- 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 "XPathExpression.h"
#include <utility>
#include "XPathResult.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/Text.h"
#include "mozilla/dom/XPathResultBinding.h"
#include "nsError.h"
#include "nsINode.h"
#include "txExpr.h"
#include "txExprResult.h"
#include "txIXPathContext.h"
#include "txURIUtils.h"
#include "txXPathTreeWalker.h"
namespace mozilla {
namespace dom {
class EvalContextImpl : public txIEvalContext {
public:
EvalContextImpl(const txXPathNode& aContextNode, uint32_t aContextPosition,
uint32_t aContextSize, txResultRecycler* aRecycler)
: mContextNode(aContextNode),
mContextPosition(aContextPosition),
mContextSize(aContextSize),
mLastError(NS_OK),
mRecycler(aRecycler) {}
nsresult getError() { return mLastError; }
TX_DECL_EVAL_CONTEXT;
private:
const txXPathNode& mContextNode;
uint32_t mContextPosition;
uint32_t mContextSize;
nsresult mLastError;
RefPtr<txResultRecycler> mRecycler;
};
XPathExpression::XPathExpression(UniquePtr<Expr>&& aExpression,
txResultRecycler* aRecycler,
Document* aDocument)
: mExpression(std::move(aExpression)),
mRecycler(aRecycler),
mDocument(do_GetWeakReference(aDocument)),
mCheckDocument(aDocument != nullptr) {}
XPathExpression::~XPathExpression() = default;
already_AddRefed<XPathResult> XPathExpression::EvaluateWithContext(
JSContext* aCx, nsINode& aContextNode, uint32_t aContextPosition,
uint32_t aContextSize, uint16_t aType, JS::Handle<JSObject*> aInResult,
ErrorResult& aRv) {
RefPtr<XPathResult> inResult;
if (aInResult) {
nsresult rv = UNWRAP_OBJECT(XPathResult, aInResult, inResult);
if (NS_FAILED(rv) && rv != NS_ERROR_XPC_BAD_CONVERT_JS) {
aRv.Throw(rv);
return nullptr;
}
}
return EvaluateWithContext(aContextNode, aContextPosition, aContextSize,
aType, inResult, aRv);
}
already_AddRefed<XPathResult> XPathExpression::EvaluateWithContext(
nsINode& aContextNode, uint32_t aContextPosition, uint32_t aContextSize,
uint16_t aType, XPathResult* aInResult, ErrorResult& aRv) {
if (aContextPosition > aContextSize) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
if (aType > XPathResult_Binding::FIRST_ORDERED_NODE_TYPE) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return nullptr;
}
if (!nsContentUtils::LegacyIsCallerNativeCode() &&
!nsContentUtils::CanCallerAccess(&aContextNode)) {
aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
return nullptr;
}
if (mCheckDocument) {
nsCOMPtr<Document> doc = do_QueryReferent(mDocument);
if (doc != aContextNode.OwnerDoc()) {
aRv.Throw(NS_ERROR_DOM_WRONG_DOCUMENT_ERR);
return nullptr;
}
}
uint16_t nodeType = aContextNode.NodeType();
if (nodeType == nsINode::TEXT_NODE ||
nodeType == nsINode::CDATA_SECTION_NODE) {
Text* textNode = aContextNode.GetAsText();
MOZ_ASSERT(textNode);
uint32_t textLength = textNode->Length();
if (textLength == 0) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return nullptr;
}
// XXX Need to get logical XPath text node for CDATASection
// and Text nodes.
} else if (nodeType != nsINode::DOCUMENT_NODE &&
nodeType != nsINode::ELEMENT_NODE &&
nodeType != nsINode::ATTRIBUTE_NODE &&
nodeType != nsINode::COMMENT_NODE &&
nodeType != nsINode::PROCESSING_INSTRUCTION_NODE) {
aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
return nullptr;
}
UniquePtr<txXPathNode> contextNode(
txXPathNativeNode::createXPathNode(&aContextNode));
if (!contextNode) {
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
EvalContextImpl eContext(*contextNode, aContextPosition, aContextSize,
mRecycler);
RefPtr<txAExprResult> exprResult;
aRv = mExpression->evaluate(&eContext, getter_AddRefs(exprResult));
if (aRv.Failed()) {
return nullptr;
}
uint16_t resultType = aType;
if (aType == XPathResult::ANY_TYPE) {
short exprResultType = exprResult->getResultType();
switch (exprResultType) {
case txAExprResult::NUMBER:
resultType = XPathResult::NUMBER_TYPE;
break;
case txAExprResult::STRING:
resultType = XPathResult::STRING_TYPE;
break;
case txAExprResult::BOOLEAN:
resultType = XPathResult::BOOLEAN_TYPE;
break;
case txAExprResult::NODESET:
resultType = XPathResult::UNORDERED_NODE_ITERATOR_TYPE;
break;
case txAExprResult::RESULT_TREE_FRAGMENT:
aRv.Throw(NS_ERROR_FAILURE);
return nullptr;
}
}
RefPtr<XPathResult> xpathResult = aInResult;
if (!xpathResult) {
xpathResult = new XPathResult(&aContextNode);
}
xpathResult->SetExprResult(exprResult, resultType, &aContextNode, aRv);
if (aRv.Failed()) {
return nullptr;
}
return xpathResult.forget();
}
/*
* Implementation of the txIEvalContext private to XPathExpression
* EvalContextImpl bases on only one context node and no variables
*/
nsresult EvalContextImpl::getVariable(int32_t aNamespace, nsAtom* aLName,
txAExprResult*& aResult) {
aResult = 0;
return NS_ERROR_INVALID_ARG;
}
nsresult EvalContextImpl::isStripSpaceAllowed(const txXPathNode& aNode,
bool& aAllowed) {
aAllowed = false;
return NS_OK;
}
void* EvalContextImpl::getPrivateContext() {
// we don't have a private context here.
return nullptr;
}
txResultRecycler* EvalContextImpl::recycler() { return mRecycler; }
void EvalContextImpl::receiveError(const nsAString& aMsg, nsresult aRes) {
mLastError = aRes;
// forward aMsg to console service?
}
const txXPathNode& EvalContextImpl::getContextNode() { return mContextNode; }
uint32_t EvalContextImpl::size() { return mContextSize; }
uint32_t EvalContextImpl::position() { return mContextPosition; }
} // namespace dom
} // namespace mozilla
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