flutter_flutter/engine/core/dom/MutationRecord.cpp

/*
 * Copyright (C) 2011 Google Inc. All rights reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
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 *
 *     * Redistributions of source code must retain the above copyright
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 * in the documentation and/or other materials provided with the
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 * this software without specific prior written permission.
 *
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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#include "config.h"

#include "core/dom/MutationRecord.h"

#include "core/dom/Node.h"
#include "core/dom/NodeList.h"
#include "core/dom/QualifiedName.h"
#include "core/dom/StaticNodeList.h"
#include "wtf/StdLibExtras.h"

namespace blink {

namespace {

class ChildListRecord : public MutationRecord {
public:
    ChildListRecord(PassRefPtr<Node> target, PassRefPtr<StaticNodeList> added, PassRefPtr<StaticNodeList> removed, PassRefPtr<Node> previousSibling, PassRefPtr<Node> nextSibling)
        : m_target(target)
        , m_addedNodes(added)
        , m_removedNodes(removed)
        , m_previousSibling(previousSibling)
        , m_nextSibling(nextSibling)
    {
    }

    virtual void trace(Visitor* visitor) override
    {
        visitor->trace(m_target);
        visitor->trace(m_addedNodes);
        visitor->trace(m_removedNodes);
        visitor->trace(m_previousSibling);
        visitor->trace(m_nextSibling);
        MutationRecord::trace(visitor);
    }

private:
    virtual const AtomicString& type() override;
    virtual Node* target() override { return m_target.get(); }
    virtual StaticNodeList* addedNodes() override { return m_addedNodes.get(); }
    virtual StaticNodeList* removedNodes() override { return m_removedNodes.get(); }
    virtual Node* previousSibling() override { return m_previousSibling.get(); }
    virtual Node* nextSibling() override { return m_nextSibling.get(); }

    RefPtr<Node> m_target;
    RefPtr<StaticNodeList> m_addedNodes;
    RefPtr<StaticNodeList> m_removedNodes;
    RefPtr<Node> m_previousSibling;
    RefPtr<Node> m_nextSibling;
};

class RecordWithEmptyNodeLists : public MutationRecord {
public:
    RecordWithEmptyNodeLists(PassRefPtr<Node> target, const String& oldValue)
        : m_target(target)
        , m_oldValue(oldValue)
    {
    }

    virtual void trace(Visitor* visitor) override
    {
        visitor->trace(m_target);
        visitor->trace(m_addedNodes);
        visitor->trace(m_removedNodes);
        MutationRecord::trace(visitor);
    }

private:
    virtual Node* target() override { return m_target.get(); }
    virtual String oldValue() override { return m_oldValue; }
    virtual StaticNodeList* addedNodes() override { return lazilyInitializeEmptyNodeList(m_addedNodes); }
    virtual StaticNodeList* removedNodes() override { return lazilyInitializeEmptyNodeList(m_removedNodes); }

    static StaticNodeList* lazilyInitializeEmptyNodeList(RefPtr<StaticNodeList>& nodeList)
    {
        if (!nodeList)
            nodeList = StaticNodeList::createEmpty();
        return nodeList.get();
    }

    RefPtr<Node> m_target;
    String m_oldValue;
    RefPtr<StaticNodeList> m_addedNodes;
    RefPtr<StaticNodeList> m_removedNodes;
};

class AttributesRecord : public RecordWithEmptyNodeLists {
public:
    AttributesRecord(PassRefPtr<Node> target, const QualifiedName& name, const AtomicString& oldValue)
        : RecordWithEmptyNodeLists(target, oldValue)
        , m_attributeName(name.localName())
    {
    }

private:
    virtual const AtomicString& type() override;
    virtual const AtomicString& attributeName() override { return m_attributeName; }

    AtomicString m_attributeName;
};

class CharacterDataRecord : public RecordWithEmptyNodeLists {
public:
    CharacterDataRecord(PassRefPtr<Node> target, const String& oldValue)
        : RecordWithEmptyNodeLists(target, oldValue)
    {
    }

private:
    virtual const AtomicString& type() override;
};

class MutationRecordWithNullOldValue : public MutationRecord {
public:
    MutationRecordWithNullOldValue(PassRefPtr<MutationRecord> record)
        : m_record(record)
    {
    }

    virtual void trace(Visitor* visitor) override
    {
        visitor->trace(m_record);
        MutationRecord::trace(visitor);
    }

private:
    virtual const AtomicString& type() override { return m_record->type(); }
    virtual Node* target() override { return m_record->target(); }
    virtual StaticNodeList* addedNodes() override { return m_record->addedNodes(); }
    virtual StaticNodeList* removedNodes() override { return m_record->removedNodes(); }
    virtual Node* previousSibling() override { return m_record->previousSibling(); }
    virtual Node* nextSibling() override { return m_record->nextSibling(); }
    virtual const AtomicString& attributeName() override { return m_record->attributeName(); }

    virtual String oldValue() override { return String(); }

    RefPtr<MutationRecord> m_record;
};

const AtomicString& ChildListRecord::type()
{
    DEFINE_STATIC_LOCAL(AtomicString, childList, ("childList", AtomicString::ConstructFromLiteral));
    return childList;
}

const AtomicString& AttributesRecord::type()
{
    DEFINE_STATIC_LOCAL(AtomicString, attributes, ("attributes", AtomicString::ConstructFromLiteral));
    return attributes;
}

const AtomicString& CharacterDataRecord::type()
{
    DEFINE_STATIC_LOCAL(AtomicString, characterData, ("characterData", AtomicString::ConstructFromLiteral));
    return characterData;
}

} // namespace

PassRefPtr<MutationRecord> MutationRecord::createChildList(PassRefPtr<Node> target, PassRefPtr<StaticNodeList> added, PassRefPtr<StaticNodeList> removed, PassRefPtr<Node> previousSibling, PassRefPtr<Node> nextSibling)
{
    return adoptRef(new ChildListRecord(target, added, removed, previousSibling, nextSibling));
}

PassRefPtr<MutationRecord> MutationRecord::createAttributes(PassRefPtr<Node> target, const QualifiedName& name, const AtomicString& oldValue)
{
    return adoptRef(new AttributesRecord(target, name, oldValue));
}

PassRefPtr<MutationRecord> MutationRecord::createCharacterData(PassRefPtr<Node> target, const String& oldValue)
{
    return adoptRef(new CharacterDataRecord(target, oldValue));
}

PassRefPtr<MutationRecord> MutationRecord::createWithNullOldValue(PassRefPtr<MutationRecord> record)
{
    return adoptRef(new MutationRecordWithNullOldValue(record));
}

MutationRecord::~MutationRecord()
{
}

} // namespace blink