third_party/WebKit/Source/core/dom/ContextFeatures.cpp

/*
 * Copyright (C) 2012 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.
 *     * 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,
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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#include "core/dom/ContextFeatures.h"

#include "core/dom/Document.h"
#include "core/page/Page.h"
#include "platform/RuntimeEnabledFeatures.h"
#include "wtf/PtrUtil.h"
#include "wtf/StdLibExtras.h"
#include <memory>

namespace blink {

std::unique_ptr<ContextFeaturesClient> ContextFeaturesClient::empty() {
  return makeUnique<ContextFeaturesClient>();
}

const char* ContextFeatures::supplementName() {
  return "ContextFeatures";
}

ContextFeatures& ContextFeatures::defaultSwitch() {
  DEFINE_STATIC_LOCAL(
      ContextFeatures, instance,
      (ContextFeatures::create(ContextFeaturesClient::empty())));
  return instance;
}

bool ContextFeatures::pagePopupEnabled(Document* document) {
  if (!document)
    return false;
  return document->contextFeatures().isEnabled(document, PagePopup, false);
}

bool ContextFeatures::mutationEventsEnabled(Document* document) {
  DCHECK(document);
  if (!document)
    return true;
  return document->contextFeatures().isEnabled(document, MutationEvents, true);
}

void provideContextFeaturesTo(Page& page,
                              std::unique_ptr<ContextFeaturesClient> client) {
  Supplement<Page>::provideTo(page, ContextFeatures::supplementName(),
                              ContextFeatures::create(std::move(client)));
}

void provideContextFeaturesToDocumentFrom(Document& document, Page& page) {
  ContextFeatures* provided = static_cast<ContextFeatures*>(
      Supplement<Page>::from(page, ContextFeatures::supplementName()));
  if (!provided)
    return;
  document.setContextFeatures(*provided);
}

}  // namespace blink