chromium/src/third_party/blink/renderer/core/frame/deprecation.h

// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_DEPRECATION_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_DEPRECATION_H_

#include <bitset>

#include "base/macros.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/css/css_property_names.h"
#include "third_party/blink/renderer/core/frame/web_feature.h"
#include "third_party/blink/renderer/platform/instrumentation/use_counter.h"

namespace blink {
namespace mojom {
enum class FeaturePolicyFeature;
}  // namespace mojom

class ExecutionContext;
class LocalDOMWindow;
class LocalFrame;

class CORE_EXPORT Deprecation final {
  DISALLOW_NEW();

 public:
  Deprecation();

  static void WarnOnDeprecatedProperties(const LocalFrame*,
                                         CSSPropertyID unresolved_property);
  void ClearSuppression();

  void MuteForInspector();
  void UnmuteForInspector();

  // "countDeprecation" sets the bit for this feature to 1, and sends a
  // deprecation warning to the console. Repeated calls are ignored.
  //
  // Be considerate to developers' consoles: features should only send
  // deprecation warnings when we're actively interested in removing them from
  // the platform.
  static void CountDeprecation(ExecutionContext*, WebFeature);

  // Count only features if they're being used in an iframe which does not
  // have script access into the top level window.
  static void CountDeprecationCrossOriginIframe(LocalDOMWindow*, WebFeature);

  static String DeprecationMessage(WebFeature);

  // Note: this is only public for tests.
  bool IsSuppressed(CSSPropertyID unresolved_property);

 private:
  void Suppress(CSSPropertyID unresolved_property);
  void SetReported(WebFeature feature);
  bool GetReported(WebFeature feature) const;
  // CSSPropertyIDs that aren't deprecated return an empty string.
  static String DeprecationMessage(CSSPropertyID unresolved_property);

  // To minimize the report/console spam from frames coming and going, report
  // each deprecation at most once per page load per renderer process.
  std::bitset<static_cast<size_t>(WebFeature::kNumberOfFeatures)>
      features_deprecation_bits_;
  std::bitset<kNumCSSPropertyIDs> css_property_deprecation_bits_;
  unsigned mute_count_;

  DISALLOW_COPY_AND_ASSIGN(Deprecation);
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_CORE_FRAME_DEPRECATION_H_