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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 "mozilla/dom/XPathEvaluator.h"
#include <utility>
#include "XPathResult.h"
#include "mozilla/UniquePtrExtensions.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/XPathEvaluatorBinding.h"
#include "mozilla/dom/XPathExpression.h"
#include "mozilla/dom/XPathNSResolverBinding.h"
#include "nsAtom.h"
#include "nsCOMPtr.h"
#include "nsContentCID.h"
#include "nsContentUtils.h"
#include "nsDOMString.h"
#include "nsError.h"
#include "nsNameSpaceManager.h"
#include "txExpr.h"
#include "txExprParser.h"
#include "txIXPathContext.h"
#include "txURIUtils.h"
namespace mozilla::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(nsAtom* aPrefix, int32_t& aID) override;
nsresult resolveFunctionCall(nsAtom* aName, int32_t aID,
FunctionCall** aFunction) override;
bool caseInsensitiveNameTests() override;
void SetErrorOffset(uint32_t aOffset) override;
private:
XPathNSResolver* mResolver;
nsINode* mResolverNode;
nsresult mLastError;
bool mIsCaseSensitive;
};
XPathEvaluator::XPathEvaluator(Document* aDocument)
: mDocument(do_GetWeakReference(aDocument)) {}
XPathEvaluator::~XPathEvaluator() = default;
XPathExpression* XPathEvaluator::CreateExpression(const nsAString& aExpression,
XPathNSResolver* aResolver,
ErrorResult& aRv) {
nsCOMPtr<Document> 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<Document> doc = do_QueryReferent(mDocument);
XPathEvaluatorParseContext pContext(aResolver,
!(doc && doc->IsHTMLDocument()));
return CreateExpression(aExpression, &pContext, doc, aRv);
}
XPathExpression* XPathEvaluator::CreateExpression(const nsAString& aExpression,
txIParseContext* aContext,
Document* aDocument,
ErrorResult& aRv) {
if (!mRecycler) {
mRecycler = new txResultRecycler;
}
UniquePtr<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.ThrowSyntaxError("The expression is not a legal expression");
}
return nullptr;
}
return new XPathExpression(std::move(expression), mRecycler, aDocument);
}
bool XPathEvaluator::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto,
JS::MutableHandle<JSObject*> aReflector) {
return dom::XPathEvaluator_Binding::Wrap(aCx, this, aGivenProto, aReflector);
}
/* static */
XPathEvaluator* XPathEvaluator::Constructor(const GlobalObject& aGlobal) {
return new XPathEvaluator(nullptr);
}
already_AddRefed<XPathResult> XPathEvaluator::Evaluate(
JSContext* aCx, const nsAString& aExpression, nsINode& aContextNode,
XPathNSResolver* aResolver, uint16_t aType, JS::Handle<JSObject*> aResult,
ErrorResult& rv) {
UniquePtr<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(nsAtom* aPrefix,
int32_t& aID) {
aID = kNameSpaceID_Unknown;
if (!mResolver && !mResolverNode) {
return NS_ERROR_DOM_NAMESPACE_ERR;
}
nsAutoString prefix;
if (aPrefix) {
aPrefix->ToString(prefix);
}
nsAutoString 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 nsNameSpaceManager::GetInstance()->RegisterNameSpace(ns, aID);
}
nsresult XPathEvaluatorParseContext::resolveFunctionCall(nsAtom* aName,
int32_t aID,
FunctionCall** aFn) {
return NS_ERROR_XPATH_UNKNOWN_FUNCTION;
}
bool XPathEvaluatorParseContext::caseInsensitiveNameTests() {
return !mIsCaseSensitive;
}
void XPathEvaluatorParseContext::SetErrorOffset(uint32_t aOffset) {}
} // namespace mozilla::dom
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