зеркало из https://github.com/mozilla/gecko-dev.git
71 строка
3.3 KiB
C++
71 строка
3.3 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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* Implementation of some generic iterators over ancestor nodes.
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*
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* Note that these keep raw pointers to the nodes they iterate from, and as
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* such the DOM should not be mutated while they're in use. There are debug
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* assertions (via nsMutationGuard) that check this in debug builds.
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*/
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#ifndef mozilla_dom_AncestorIterator_h
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#define mozilla_dom_AncestorIterator_h
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#include "nsINode.h"
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#include "nsIContentInlines.h"
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#include "FilteredNodeIterator.h"
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namespace mozilla {
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namespace dom {
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#ifdef DEBUG
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# define MUTATION_GUARD(class_name_) \
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nsMutationGuard mMutationGuard; \
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~class_name_() { MOZ_ASSERT(!mMutationGuard.Mutated(0)); }
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#else
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# define MUTATION_GUARD(class_name_)
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#endif
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#define DEFINE_ANCESTOR_ITERATOR(name_, method_) \
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class Inclusive##name_ { \
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using Self = Inclusive##name_; \
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\
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public: \
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explicit Inclusive##name_(const nsINode& aNode) \
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: mCurrent(const_cast<nsINode*>(&aNode)) {} \
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Self& begin() { return *this; } \
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std::nullptr_t end() const { return nullptr; } \
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bool operator!=(std::nullptr_t) const { return !!mCurrent; } \
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void operator++() { mCurrent = mCurrent->method_(); } \
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nsINode* operator*() { return mCurrent; } \
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\
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MUTATION_GUARD(Inclusive##name_) \
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\
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protected: \
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explicit Inclusive##name_(nsINode* aCurrent) : mCurrent(aCurrent) {} \
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nsINode* mCurrent; \
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}; \
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class name_ : public Inclusive##name_ { \
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using Super = Inclusive##name_; \
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explicit name_(const nsINode& aNode) \
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: Inclusive##name_(aNode.method_()) {} \
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}; \
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template <typename T> \
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using name_##OfType = FilteredNodeIterator<T, name_>; \
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template <typename T> \
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using Inclusive##name_##OfType = FilteredNodeIterator<T, Inclusive##name_>;
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DEFINE_ANCESTOR_ITERATOR(Ancestors, GetParentNode)
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DEFINE_ANCESTOR_ITERATOR(FlatTreeAncestors, GetFlattenedTreeParentNode)
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#undef MUTATION_GUARD
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_AncestorIterator.h
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