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/*
* Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <WebCore/Node.h>
namespace WebCore::XPath {
class NodeSet {
public:
NodeSet() : m_isSorted(true), m_subtreesAreDisjoint(false) { }
explicit NodeSet(Ref<Node>&& node)
: m_isSorted(true), m_subtreesAreDisjoint(false), m_nodes(1, WTF::move(node))
{ }
size_t size() const { return m_nodes.size(); }
bool isEmpty() const { return m_nodes.isEmpty(); }
Node* operator[](unsigned i) const LIFETIME_BOUND { return m_nodes.at(i).ptr(); }
void reserveCapacity(size_t newCapacity) { m_nodes.reserveCapacity(newCapacity); }
void clear() { m_nodes.clear(); }
// NodeSet itself does not verify that nodes in it are unique.
void append(Ref<Node>&& node) { m_nodes.append(WTF::move(node)); }
void append(const NodeSet& nodeSet) { m_nodes.appendVector(nodeSet.m_nodes); }
// Returns the set's first node in document order, or nullptr if the set is empty.
Node* firstNode() const;
// Returns nullptr if the set is empty.
Node* anyNode() const;
// NodeSet itself doesn't check if it contains nodes in document order - the caller should tell it if it does not.
void markSorted(bool isSorted) { m_isSorted = isSorted; }
bool isSorted() const { return m_isSorted || m_nodes.size() < 2; }
void sort() const;
// No node in the set is ancestor of another. Unlike m_isSorted, this is assumed to be false, unless the caller sets it to true.
void markSubtreesDisjoint(bool disjoint) { m_subtreesAreDisjoint = disjoint; }
bool subtreesAreDisjoint() const { return m_subtreesAreDisjoint || m_nodes.size() < 2; }
auto begin() const LIFETIME_BOUND { return m_nodes.begin(); }
auto end() const LIFETIME_BOUND { return m_nodes.end(); }
private:
void traversalSort() const;
mutable bool m_isSorted;
bool m_subtreesAreDisjoint;
mutable Vector<Ref<Node>> m_nodes;
};
} // namespace WebCore::XPath
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