First step of HTMLImports

Source/core/html/HTMLImports.cpp

+/*
+ * 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/HTMLImports.h"
+
+#include "core/dom/DocumentFragment.h"
+#include "core/dom/DocumentType.h"
+#include "core/dom/Range.h"
+#include "core/html/HTMLDocument.h"
+#include "core/html/HTMLLinkElement.h"
+#include "core/loader/cache/CachedResourceLoader.h"
+#include "core/loader/cache/CachedScript.h"
+#include "weborigin/SecurityOrigin.h"
+
+namespace WebCore {
+
+PassRefPtr<LinkImport> LinkImport::create(HTMLLinkElement* owner)
+{
+    return adoptRef(new LinkImport(owner));
+}
+
+LinkImport::LinkImport(HTMLLinkElement* owner)
+    : LinkResource(owner)
+    , m_imports(0)
+    , m_ofSameLocation(0)
+    , m_state(StatePreparing)
+{
+}
+
+LinkImport::~LinkImport()
+{
+    if (m_resource)
+        m_resource->removeClient(this);
+}
+
+LinkImport::State LinkImport::finish()
+{
+    if (!m_imports)
+        return StateError;
+
+    if (m_resource->loadFailedOrCanceled())
+        return StateError;
+
+    String error;
+    if (!m_imports->securityOrigin()->canRequest(m_resource->response().url())
+        && !m_resource->passesAccessControlCheck(m_imports->securityOrigin(), error)) {
+        m_imports->showSecurityErrorMessage("Import from origin '" + SecurityOrigin::create(m_resource->response().url())->toString() + "' has been blocked from loading by Cross-Origin Resource Sharing policy: " + error);
+        return StateError;
+    }
+
+    // FIXME(morrita): This should be done in incremental way.
+    RefPtr<Document> parsingPlaceholder = HTMLDocument::create(0, KURL());
+    parsingPlaceholder->setContent(m_resource->script());
+
+    // Doctypes cannot be moved between documents. So we remove it before the migration.
+    if (RefPtr<Node> doctype = parsingPlaceholder->doctype())
+        parsingPlaceholder->removeChild(doctype.get());
+    m_importedFragment->takeAllChildrenFrom(parsingPlaceholder.get());
+
+    return StateReady;
+}
+
+void LinkImport::notifyFinished(CachedResource*)
+{
+    setState(finish());
+}
+
+void LinkImport::setState(State state)
+{
+    if (m_state == state)
+        return;
+    m_state = state;
+
+    if ((m_state == StateReady  || m_state == StateError)
+        && m_imports)
+        m_imports->didLoad();
+}
+
+LinkImport::State LinkImport::startRequest()
+{
+    ASSERT(m_owner);
+    ASSERT(m_state == StatePreparing);
+
+    // FIXME(morrita): Should take care of sub-imports whose document doesn't have frame.
+    if (!m_owner->document()->frame())
+        return StateError;
+
+    LinkRequestBuilder builder(m_owner);
+    if (!builder.isValid())
+        return StateError;
+
+    m_imports = m_owner->document()->imports();
+    if (RefPtr<LinkImport> found = m_imports->findLinkFor(builder.url())) {
+        m_ofSameLocation = found.get();
+        return StateReady;
+    }
+
+    CachedResourceRequest request = builder.build(true);
+    m_resource = m_owner->document()->cachedResourceLoader()->requestScript(request);
+    if (!m_resource)
+        return StateError;
+
+    m_resource->addClient(this);
+    m_url = builder.url();
+    m_imports->addImport(this);
+    m_importedFragment = m_imports->createDocumentFragment();
+
+    return StateStarted;
+}
+
+DocumentFragment* LinkImport::importedFragment() const
+{
+    if (!m_owner)
+        return 0;
+    if (m_state != StateReady)
+        return 0;
+
+    if (m_ofSameLocation) {
+        ASSERT(!m_importedFragment);
+        return m_ofSameLocation->importedFragment();
+    }
+
+    return m_importedFragment.get();
+}
+
+void LinkImport::process()
+{
+    if (StatePreparing != m_state)
+        return;
+    setState(startRequest());
+}
+
+void LinkImport::ownerRemoved()
+{
+    m_owner = 0;
+}
+
+void LinkImport::importDestroyed()
+{
+    m_imports = 0;
+    m_importedFragment.clear();
+}
+
+PassOwnPtr<HTMLImports> HTMLImports::create(HTMLImportsMaster* master)
+{
+    return adoptPtr(new HTMLImports(master));
+}
+
+HTMLImports::HTMLImports(HTMLImportsMaster* master)
+    : m_master(master)
+    , m_owner(HTMLDocument::create(0, KURL()))

[dglazkov, 2013/05/28 17:12:47]

THIS is where things will get super-crazy. Because we only have one imported
fragment owner, we can't adjust document location for multiple imports, which
means that we can't resolve URLs properly. See
https://www.w3.org/Bugs/Public/show_bug.cgi?id=19870 for more info.

[Hajime Morrita, 2013/05/29 01:36:00]

Probably we should have multiple master documents each of which represents a
"base" url,
and let each component being owned by corresponding master document. I'm not
sure if this works though.

+{
+}
+
+HTMLImports::~HTMLImports()
+{
+    for (size_t i = 0; i < m_imports.size(); ++i)
+        m_imports[i]->importDestroyed();
+}
+
+void HTMLImports::addImport(PassRefPtr<LinkImport> link)
+{
+    ASSERT(!link->url().isEmpty() && link->url().isValid());
+    m_imports.append(link);
+}
+
+void HTMLImports::showSecurityErrorMessage(const String& message)
+{
+    m_master->showSecurityErrorMessage(message);
+}
+
+void HTMLImports::didLoad()
+{
+    if (haveLoaded())
+        m_master->didLoadAllImports();
+}
+
+PassRefPtr<DocumentFragment> HTMLImports::createDocumentFragment() const
+{
+    return m_owner->createDocumentFragment();
+}
+
+PassRefPtr<LinkImport> HTMLImports::findLinkFor(const KURL& url) const
+{
+    for (size_t i = 0; i < m_imports.size(); ++i) {
+        if (m_imports[i]->url() == url)
+            return m_imports[i];
+    }
+
+    return 0;
+}
+
+SecurityOrigin* HTMLImports::securityOrigin() const
+{
+    return m_master->importsContext()->securityOrigin();
+}
+
+bool HTMLImports::haveLoaded() const
+{
+    for (size_t i = 0; i < m_imports.size(); ++i) {
+        if (!m_imports[i]->isDone())
+            return false;
+    }
+
+    return true;
+}
+
+} // namespace WebCore