forked from mirrors/gecko-dev
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsTraversal.h"
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#include "nsError.h"
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#include "nsINode.h"
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#include "mozilla/AutoRestore.h"
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#include "mozilla/dom/NodeFilterBinding.h"
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#include "nsGkAtoms.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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nsTraversal::nsTraversal(nsINode* aRoot, uint32_t aWhatToShow,
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NodeFilter* aFilter)
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: mRoot(aRoot),
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mWhatToShow(aWhatToShow),
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mFilter(aFilter),
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mInAcceptNode(false) {
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NS_ASSERTION(aRoot, "invalid root in call to nsTraversal constructor");
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}
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nsTraversal::~nsTraversal() { /* destructor code */
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}
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/*
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* Tests if and how a node should be filtered. Uses mWhatToShow and
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* mFilter to test the node.
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* @param aNode Node to test
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* @param aResult Whether we succeeded
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* @returns Filtervalue. See NodeFilter.webidl
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*/
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int16_t nsTraversal::TestNode(nsINode* aNode, mozilla::ErrorResult& aResult) {
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if (mInAcceptNode) {
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aResult.Throw(NS_ERROR_DOM_INVALID_STATE_ERR);
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return 0;
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}
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uint16_t nodeType = aNode->NodeType();
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if (nodeType <= 12 && !((1 << (nodeType - 1)) & mWhatToShow)) {
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return NodeFilter_Binding::FILTER_SKIP;
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}
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if (!mFilter) {
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// No filter, just accept
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return NodeFilter_Binding::FILTER_ACCEPT;
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}
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AutoRestore<bool> inAcceptNode(mInAcceptNode);
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mInAcceptNode = true;
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// No need to pass in an execution reason, since the generated default,
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// "NodeFilter.acceptNode", is pretty much exactly what we'd say anyway.
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return mFilter->AcceptNode(*aNode, aResult, nullptr,
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CallbackObject::eRethrowExceptions);
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}
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