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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 19:33:14 +0000 |
commit | 36d22d82aa202bb199967e9512281e9a53db42c9 (patch) | |
tree | 105e8c98ddea1c1e4784a60a5a6410fa416be2de /dom/base/FilteredNodeIterator.h | |
parent | Initial commit. (diff) | |
download | firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.tar.xz firefox-esr-36d22d82aa202bb199967e9512281e9a53db42c9.zip |
Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'dom/base/FilteredNodeIterator.h')
-rw-r--r-- | dom/base/FilteredNodeIterator.h | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/dom/base/FilteredNodeIterator.h b/dom/base/FilteredNodeIterator.h new file mode 100644 index 0000000000..58d503f799 --- /dev/null +++ b/dom/base/FilteredNodeIterator.h @@ -0,0 +1,57 @@ +/* -*- 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 |