flutter_flutter/engine/core/css/invalidation/DescendantInvalidationSet.cpp

/*
 * Copyright (C) 2014 Google Inc. All rights reserved.
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 * modification, are permitted provided that the following conditions are
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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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include "config.h"
#include "core/css/invalidation/DescendantInvalidationSet.h"

#include "core/css/resolver/StyleResolver.h"
#include "core/dom/Element.h"

namespace blink {

DescendantInvalidationSet::DescendantInvalidationSet()
    : m_allDescendantsMightBeInvalid(false)
    , m_customPseudoInvalid(false)
    , m_treeBoundaryCrossing(false)
{
}

bool DescendantInvalidationSet::invalidatesElement(Element& element) const
{
    if (m_allDescendantsMightBeInvalid)
        return true;

    if (m_tagNames && m_tagNames->contains(element.tagQName().localName()))
        return true;

    if (element.hasID() && m_ids && m_ids->contains(element.idForStyleResolution()))
        return true;

    if (element.hasClass() && m_classes) {
        const SpaceSplitString& classNames = element.classNames();
        for (HashSet<AtomicString>::const_iterator it = m_classes->begin(); it != m_classes->end(); ++it) {
            if (classNames.contains(*it))
                return true;
        }
    }

    if (element.hasAttributes() && m_attributes) {
        for (HashSet<AtomicString>::const_iterator it = m_attributes->begin(); it != m_attributes->end(); ++it) {
            if (element.hasAttribute(*it))
                return true;
        }
    }

    return false;
}

void DescendantInvalidationSet::combine(const DescendantInvalidationSet& other)
{
    // No longer bother combining data structures, since the whole subtree is deemed invalid.
    if (wholeSubtreeInvalid())
        return;

    if (other.wholeSubtreeInvalid()) {
        setWholeSubtreeInvalid();
        return;
    }

    if (other.customPseudoInvalid())
        setCustomPseudoInvalid();

    if (other.treeBoundaryCrossing())
        setTreeBoundaryCrossing();

    if (other.m_classes) {
        HashSet<AtomicString>::const_iterator end = other.m_classes->end();
        for (HashSet<AtomicString>::const_iterator it = other.m_classes->begin(); it != end; ++it)
            addClass(*it);
    }

    if (other.m_ids) {
        HashSet<AtomicString>::const_iterator end = other.m_ids->end();
        for (HashSet<AtomicString>::const_iterator it = other.m_ids->begin(); it != end; ++it)
            addId(*it);
    }

    if (other.m_tagNames) {
        HashSet<AtomicString>::const_iterator end = other.m_tagNames->end();
        for (HashSet<AtomicString>::const_iterator it = other.m_tagNames->begin(); it != end; ++it)
            addTagName(*it);
    }

    if (other.m_attributes) {
        HashSet<AtomicString>::const_iterator end = other.m_attributes->end();
        for (HashSet<AtomicString>::const_iterator it = other.m_attributes->begin(); it != end; ++it)
            addAttribute(*it);
    }
}

HashSet<AtomicString>& DescendantInvalidationSet::ensureClassSet()
{
    if (!m_classes)
        m_classes = adoptPtr(new HashSet<AtomicString>);
    return *m_classes;
}

HashSet<AtomicString>& DescendantInvalidationSet::ensureIdSet()
{
    if (!m_ids)
        m_ids = adoptPtr(new HashSet<AtomicString>);
    return *m_ids;
}

HashSet<AtomicString>& DescendantInvalidationSet::ensureTagNameSet()
{
    if (!m_tagNames)
        m_tagNames = adoptPtr(new HashSet<AtomicString>);
    return *m_tagNames;
}

HashSet<AtomicString>& DescendantInvalidationSet::ensureAttributeSet()
{
    if (!m_attributes)
        m_attributes = adoptPtr(new HashSet<AtomicString>);
    return *m_attributes;
}

void DescendantInvalidationSet::addClass(const AtomicString& className)
{
    if (wholeSubtreeInvalid())
        return;
    ensureClassSet().add(className);
}

void DescendantInvalidationSet::addId(const AtomicString& id)
{
    if (wholeSubtreeInvalid())
        return;
    ensureIdSet().add(id);
}

void DescendantInvalidationSet::addTagName(const AtomicString& tagName)
{
    if (wholeSubtreeInvalid())
        return;
    ensureTagNameSet().add(tagName);
}

void DescendantInvalidationSet::addAttribute(const AtomicString& attribute)
{
    if (wholeSubtreeInvalid())
        return;
    ensureAttributeSet().add(attribute);
}

void DescendantInvalidationSet::setWholeSubtreeInvalid()
{
    if (m_allDescendantsMightBeInvalid)
        return;

    m_allDescendantsMightBeInvalid = true;
    m_treeBoundaryCrossing = false;
    m_classes = nullptr;
    m_ids = nullptr;
    m_tagNames = nullptr;
    m_attributes = nullptr;
}

void DescendantInvalidationSet::trace(Visitor* visitor)
{
#if ENABLE(OILPAN)
    visitor->trace(m_classes);
    visitor->trace(m_ids);
    visitor->trace(m_tagNames);
    visitor->trace(m_attributes);
#endif
}

#ifndef NDEBUG
void DescendantInvalidationSet::show() const
{
    fprintf(stderr, "DescendantInvalidationSet { ");
    if (m_allDescendantsMightBeInvalid)
        fprintf(stderr, "* ");
    if (m_customPseudoInvalid)
        fprintf(stderr, "::custom ");
    if (m_treeBoundaryCrossing)
        fprintf(stderr, "::shadow/deep/ ");
    if (m_ids) {
        for (HashSet<AtomicString>::const_iterator it = m_ids->begin(); it != m_ids->end(); ++it)
            fprintf(stderr, "#%s ", (*it).ascii().data());
    }
    if (m_classes) {
        for (HashSet<AtomicString>::const_iterator it = m_classes->begin(); it != m_classes->end(); ++it)
            fprintf(stderr, ".%s ", (*it).ascii().data());
    }
    if (m_tagNames) {
        for (HashSet<AtomicString>::const_iterator it = m_tagNames->begin(); it != m_tagNames->end(); ++it)
            fprintf(stderr, "<%s> ", (*it).ascii().data());
    }
    if (m_attributes) {
        for (HashSet<AtomicString>::const_iterator it = m_attributes->begin(); it != m_attributes->end(); ++it)
            fprintf(stderr, "[%s] ", (*it).ascii().data());
    }
    fprintf(stderr, "}\n");
}
#endif // NDEBUG

} // namespace blink