Share Custom Element registration contexts between related documents.

Source/core/dom/CustomElementRegistrationContextualizer.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:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. 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.
+ * 3. 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 "CustomElementRegistrationContextualizer.h"
+
+#include "RuntimeEnabledFeatures.h"
+#include "core/dom/CustomElementRegistrationContext.h"
+#include "core/dom/Document.h"
+
+namespace WebCore {
+
+// These three methods--documentCanProcessCustomElements and
+// documentShouldProcessCustomElements (overloaded)--implement the
+// policy of whether a document should process Custom Elements at all.
+
+static bool documentCanProcessCustomElements(Document* document)
+{
+    return (document->isHTMLDocument() || document->isSVGDocument())
+        && !document->isPluginDocument()
+        && RuntimeEnabledFeatures::customDOMElementsEnabled();
+}
+
+bool CustomElementRegistrationContextualizer::documentShouldProcessCustomElements(DocumentCreationReason reason, Document* document)
+{
+    if (!documentCanProcessCustomElements(document))
+        return false;
+
+    switch (reason) {
+    case Loader:
+        return true;
+
+    case DOMParser_parseFromString:
+    case DocumentWithXSLTPI:
+    case XHR_responseXML:
+    case XSLTProcessor_transformToDocument:
+        return false;
+
+    default:
+        ASSERT_NOT_REACHED();
+        return false;
+    }
+}
+
+bool CustomElementRegistrationContextualizer::documentShouldProcessCustomElements(ContextualizedDocumentCreationReason reason, Document* document)
+{
+    if (!documentCanProcessCustomElements(document))
+        return false;
+
+    switch (reason) {
+    case DOMImplementation_createDocument:
+    case HTMLImport:
+    case Template:
+        return true;
+
+    case InspectorDOMPatch:
+    case PasteboardFragment:
+        return false;
+
+    default:
+        ASSERT_NOT_REACHED();
+        return false;
+    }
+}
+
+// documentShouldShareRegistrationContext implements the policy of
+// whether a document should share the registration context it was
+// created in, or get a new context.
+bool CustomElementRegistrationContextualizer::documentShouldShareRegistrationContext(ContextualizedDocumentCreationReason reason, Document* document)
+{
+    switch (reason) {
+    case DOMImplementation_createDocument:
+    case HTMLImport:
+    case Template:
+        return true;
+
+    case InspectorDOMPatch:
+    case PasteboardFragment:
+    default:
+        ASSERT_NOT_REACHED();
+        return false;
+    }
+}
+
+void CustomElementRegistrationContextualizer::didCreateDocument(DocumentCreationReason reason, Document* document)
+{
+    document->setRegistrationContext(
+        documentShouldProcessCustomElements(reason, document)
+        ? CustomElementRegistrationContext::create()
+        : CustomElementRegistrationContext::nullRegistrationContext());
+}
+
+void CustomElementRegistrationContextualizer::didCreateRelatedDocument(PassRefPtr<CustomElementRegistrationContext> existingContext, ContextualizedDocumentCreationReason reason, Document* document)
+{
+    if (!documentShouldProcessCustomElements(reason, document)) {
+        document->setRegistrationContext(CustomElementRegistrationContext::nullRegistrationContext());
+        return;
+    }
+
+    if (documentShouldShareRegistrationContext(reason, document)) {
+        document->setRegistrationContext(existingContext);
+    } else {
+        ASSERT_NOT_REACHED(); // Note: There are none of these right now.
+        document->setRegistrationContext(CustomElementRegistrationContext::create());
+    }
+}
+
+} // namespace WebCore