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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
/**
* Implementation of a generic filtered iterator over nodes.
*/
#ifndef mozilla_dom_FilteredNodeIterator_h
#define mozilla_dom_FilteredNodeIterator_h
#include "nsINode.h"
namespace mozilla::dom {
template <typename T, typename Iter>
class FilteredNodeIterator : public Iter {
public:
explicit FilteredNodeIterator(const nsINode& aNode) : Iter(aNode) {
EnsureValid();
}
FilteredNodeIterator& begin() { return *this; }
using Iter::end;
void operator++() {
Iter::operator++();
EnsureValid();
}
using Iter::operator!=;
T* operator*() {
nsINode* node = Iter::operator*();
MOZ_ASSERT(!node || T::FromNode(node));
return static_cast<T*>(node);
}
private:
void EnsureValid() {
while (true) {
nsINode* node = Iter::operator*();
if (!node || T::FromNode(node)) {
return;
}
Iter::operator++();
}
}
FilteredNodeIterator() : Iter() {}
};
} // namespace mozilla::dom
#endif // mozilla_dom_FilteredNodeIterator.h
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