72 lines
1.8 KiB
C++
72 lines
1.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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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/**
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* This is a light-weight tree iterator for `for` loops when full iterator
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* functionality isn't required.
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*/
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#ifndef mozilla_dom_SimpleTreeIterator_h
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#define mozilla_dom_SimpleTreeIterator_h
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#include "nsINode.h"
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#include "nsTArray.h"
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#include "mozilla/dom/Element.h"
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namespace mozilla {
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namespace dom {
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class SimpleTreeIterator {
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public:
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/**
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* Initialize an iterator with aRoot. After that it can be iterated with a
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* range-based for loop. At the moment, that's the only supported form of use
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* for this iterator.
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*/
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explicit SimpleTreeIterator(nsINode& aRoot)
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: mCurrent(&aRoot)
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{
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mTree.AppendElement(&aRoot);
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}
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// Basic support for range-based for loops.
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// This will modify the iterator as it goes.
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SimpleTreeIterator& begin() { return *this; }
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SimpleTreeIterator end() { return SimpleTreeIterator(); }
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bool operator!=(const SimpleTreeIterator& aOther) {
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return mCurrent != aOther.mCurrent;
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}
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void operator++() { Next(); }
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nsINode* operator*() { return mCurrent; }
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private:
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// Constructor used only for end() to represent a drained iterator.
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SimpleTreeIterator()
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: mCurrent(nullptr)
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{}
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void Next() {
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MOZ_ASSERT(mCurrent, "Don't call Next() when we have no current node");
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mCurrent = mCurrent->GetNextNode(mTree.LastElement());
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}
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// The current node.
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nsINode* mCurrent;
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// The DOM tree that we're inside of right now.
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AutoTArray<nsINode*, 1> mTree;
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};
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_SimpleTreeIterator_h
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