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

DEFINITIONS

1. startLoading
2. responseReceived
3. dataReceived
4. notifyFinished
5. startWritingAndParsing
6. finishWriting
7. finishParsing
8. finishLoading
9. setState
10. didFinishParsing
11. didRemoveAllPendingStylesheet
12. hasPendingResources
13. importedDocument
14. didFinishLoading
15. addImport
16. removeImport

/*
 * Copyright (C) 2013 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * 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.
 *     * Neither the name of Google Inc. nor the names of its
 * 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
 * OWNER 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.
 */

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

#include "core/dom/Document.h"
#include "core/dom/StyleEngine.h"
#include "core/html/HTMLDocument.h"
#include "core/html/imports/HTMLImport.h"
#include "core/html/imports/HTMLImportChild.h"
#include "core/loader/DocumentWriter.h"
#include "platform/network/ContentSecurityPolicyResponseHeaders.h"


namespace WebCore {

HTMLImportLoader::HTMLImportLoader()
    : m_state(StateLoading)
{
}

HTMLImportLoader::~HTMLImportLoader()
{
    if (m_importedDocument)
        m_importedDocument->setImport(0);
}

void HTMLImportLoader::startLoading(const ResourcePtr<RawResource>& resource)
{
    setResource(resource);
}

void HTMLImportLoader::responseReceived(Resource* resource, const ResourceResponse& response)
{
    // Resource may already have been loaded with the import loader
    // being added as a client later & now being notified. Fail early.
    if (resource->loadFailedOrCanceled() || response.httpStatusCode() >= 400) {
        setState(StateError);
        return;
    }
    setState(startWritingAndParsing(response));
}

void HTMLImportLoader::dataReceived(Resource*, const char* data, int length)
{
    RefPtr<DocumentWriter> protectingWriter(m_writer);
    m_writer->addData(data, length);
}

void HTMLImportLoader::notifyFinished(Resource* resource)
{
    // The writer instance indicates that a part of the document can be already loaded.
    // We don't take such a case as an error because the partially-loaded document has been visible from script at this point.
    if (resource->loadFailedOrCanceled() && !m_writer) {
        setState(StateError);
        return;
    }

    setState(finishWriting());
}

HTMLImportLoader::State HTMLImportLoader::startWritingAndParsing(const ResourceResponse& response)
{
    ASSERT(!m_imports.isEmpty());
    HTMLImport* firstImport = m_imports[0];
    DocumentInit init = DocumentInit(response.url(), 0, firstImport->master()->contextDocument(), firstImport)
        .withRegistrationContext(firstImport->master()->registrationContext());
    m_importedDocument = HTMLDocument::create(init);
    m_writer = DocumentWriter::create(m_importedDocument.get(), response.mimeType(), response.textEncodingName());

    return StateLoading;
}

HTMLImportLoader::State HTMLImportLoader::finishWriting()
{
    return StateWritten;
}

HTMLImportLoader::State HTMLImportLoader::finishParsing()
{
    return StateParsed;
}

HTMLImportLoader::State HTMLImportLoader::finishLoading()
{
    return StateLoaded;
}

void HTMLImportLoader::setState(State state)
{
    if (m_state == state)
        return;

    m_state = state;

    if (m_state == StateParsed || m_state == StateError || m_state == StateWritten) {
        if (RefPtr<DocumentWriter> writer = m_writer.release())
            writer->end();
    }

    // Since DocumentWriter::end() can let setState() reenter, we shouldn't refer to m_state here.
    if (state == StateLoaded || state == StateError)
        didFinishLoading();
}

void HTMLImportLoader::didFinishParsing()
{
    setState(finishParsing());
    if (!hasPendingResources())
        setState(finishLoading());
}

void HTMLImportLoader::didRemoveAllPendingStylesheet()
{
    if (m_state == StateParsed)
        setState(finishLoading());
}

bool HTMLImportLoader::hasPendingResources() const
{
    return m_importedDocument && m_importedDocument->styleEngine()->hasPendingSheets();
}

Document* HTMLImportLoader::importedDocument() const
{
    if (m_state == StateError)
        return 0;
    return m_importedDocument.get();
}

void HTMLImportLoader::didFinishLoading()
{
    for (size_t i = 0; i < m_imports.size(); ++i)
        m_imports[i]->didFinishLoading();

    clearResource();

    ASSERT(!m_importedDocument || !m_importedDocument->parsing());
}

void HTMLImportLoader::addImport(HTMLImportChild* client)
{
    ASSERT(kNotFound == m_imports.find(client));
    m_imports.append(client);
    if (isDone())
        client->didFinishLoading();
}

void HTMLImportLoader::removeImport(HTMLImportChild* client)
{
    ASSERT(kNotFound != m_imports.find(client));
    m_imports.remove(m_imports.find(client));
}

} // namespace WebCore