root/Source/core/html/imports/HTMLImportStateResolver.cpp

DEFINITIONS

1. isBlockingFollowers
2. shouldBlockDocumentCreation
3. shouldBlockScriptExecution
4. isActive
5. resolve

/*
 * Copyright (C) 2014 Google 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:
 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "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
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 */

#include "config.h"
#include "core/html/imports/HTMLImportStateResolver.h"

#include "core/html/imports/HTMLImport.h"

namespace WebCore {

inline bool HTMLImportStateResolver::isBlockingFollowers(HTMLImport* import)
{
    if (!import->hasLoader())
        return true;
    if (!import->ownsLoader())
        return false;
    return !import->state().isReady();
}

inline bool HTMLImportStateResolver::shouldBlockDocumentCreation() const
{
    // If any of its preceeding imports isn't ready, this import
    // cannot start loading because such preceeding onces can include
    // duplicating import that should wins over this.
    for (const HTMLImport* ancestor = m_import; ancestor; ancestor = ancestor->parent()) {
        if (ancestor->previous() && isBlockingFollowers(ancestor->previous()))
            return true;
    }

    return false;
}

inline bool HTMLImportStateResolver::shouldBlockScriptExecution() const
{
    for (HTMLImport* child = m_import->firstChild(); child; child = child->next()) {
        if (child->isSync() && isBlockingFollowers(child))
            return true;
    }

    return false;
}

inline bool HTMLImportStateResolver::isActive() const
{
    return !m_import->isDone();
}

HTMLImportState HTMLImportStateResolver::resolve() const
{
    if (shouldBlockDocumentCreation())
        return HTMLImportState(HTMLImportState::BlockingDocumentCreation);
    if (shouldBlockScriptExecution())
        return HTMLImportState(HTMLImportState::BlockingScriptExecution);
    if (isActive())
        return HTMLImportState(HTMLImportState::Active);
    return HTMLImportState(HTMLImportState::Ready);
}

}