*** DO NOT LAND *** Attempt to understand Regions complexity

Source/core/dom/DOMNamedFlowCollection.cpp

-/*
- * Copyright (C) 2012 Adobe Systems Incorporated. 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 THE COPYRIGHT HOLDER "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 THE COPYRIGHT HOLDER 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.
- */
-#include "config.h"
-#include "core/dom/DOMNamedFlowCollection.h"
-
-#include "RuntimeEnabledFeatures.h"
-#include "core/dom/NamedFlow.h"
-#include "wtf/text/StringHash.h"
-
-namespace WebCore {
-
-DOMNamedFlowCollection::DOMNamedFlowCollection(const Vector<NamedFlow*>& namedFlows)
-{
-    ASSERT(RuntimeEnabledFeatures::cssRegionsEnabled());
-    ScriptWrappable::init(this);
-    for (Vector<NamedFlow*>::const_iterator it = namedFlows.begin(); it != namedFlows.end(); ++it)
-        m_namedFlows.add(*it);
-}
-
-unsigned long DOMNamedFlowCollection::length() const
-{
-    return m_namedFlows.size();
-}
-
-PassRefPtr<NamedFlow> DOMNamedFlowCollection::item(unsigned long index) const
-{
-    if (index >= static_cast<unsigned long>(m_namedFlows.size()))
-        return 0;
-    DOMNamedFlowSet::const_iterator it = m_namedFlows.begin();
-    for (unsigned long i = 0; i < index; ++i)
-        ++it;
-    return *it;
-}
-
-PassRefPtr<NamedFlow> DOMNamedFlowCollection::namedItem(const AtomicString& name) const
-{
-    DOMNamedFlowSet::const_iterator it = m_namedFlows.find<DOMNamedFlowHashTranslator, String>(name);
-    if (it != m_namedFlows.end())
-        return *it;
-    return 0;
-}
-
-bool DOMNamedFlowCollection::hasNamedItem(const AtomicString& name) const
-{
-    return namedItem(name);
-}
-
-// The HashFunctions object used by the HashSet to compare between RefPtr<NamedFlows>.
-// It is safe to set safeToCompareToEmptyOrDeleted because the HashSet will never contain null pointers or deleted values.
-struct DOMNamedFlowCollection::DOMNamedFlowHashFunctions {
-    static unsigned hash(PassRefPtr<NamedFlow> key) { return DefaultHash<String>::Hash::hash(key->name()); }
-    static bool equal(PassRefPtr<NamedFlow> a, PassRefPtr<NamedFlow> b) { return a->name() == b->name(); }
-    static const bool safeToCompareToEmptyOrDeleted = true;
-};
-
-// The HashTranslator is used to lookup a RefPtr<NamedFlow> in the set using a name.
-struct DOMNamedFlowCollection::DOMNamedFlowHashTranslator {
-    static unsigned hash(const String& key) { return DefaultHash<String>::Hash::hash(key); }
-    static bool equal(PassRefPtr<NamedFlow> a, const String& b) { return a->name() == b; }
-};
-} // namespace WebCore
-
-
-