Line data    Source code

       1             : // Copyright 2017 the V8 project authors. All rights reserved.
       2             : // Use of this source code is governed by a BSD-style license that can be
       3             : // found in the LICENSE file.
       4             : 
       5             : #ifndef V8_BASE_TIMEZONE_CACHE_H_
       6             : #define V8_BASE_TIMEZONE_CACHE_H_
       7             : 
       8             : namespace v8 {
       9             : namespace base {
      10             : 
      11       62447 : class TimezoneCache {
      12             :  public:
      13             :   // Short name of the local timezone (e.g., EST)
      14             :   virtual const char* LocalTimezone(double time_ms) = 0;
      15             : 
      16             :   // ES #sec-daylight-saving-time-adjustment
      17             :   // Daylight Saving Time Adjustment
      18             :   virtual double DaylightSavingsOffset(double time_ms) = 0;
      19             : 
      20             :   // ES #sec-local-time-zone-adjustment
      21             :   // Local Time Zone Adjustment
      22             :   //
      23             :   // https://github.com/tc39/ecma262/pull/778
      24             :   virtual double LocalTimeOffset(double time_ms, bool is_utc) = 0;
      25             : 
      26             :   /**
      27             :    * Time zone redetection indicator for Clear function.
      28             :    *
      29             :    * kSkip indicates host time zone doesn't have to be redetected.
      30             :    * kRedetect indicates host time zone should be redetected, and used to set
      31             :    * the default time zone.
      32             :    *
      33             :    * The host time zone detection may require file system access or similar
      34             :    * operations unlikely to be available inside a sandbox. If v8 is run inside a
      35             :    * sandbox, the host time zone has to be detected outside the sandbox
      36             :    * separately.
      37             :    */
      38             :   enum class TimeZoneDetection { kSkip, kRedetect };
      39             : 
      40             :   // Called when the local timezone changes
      41             :   virtual void Clear(TimeZoneDetection time_zone_detection) = 0;
      42             : 
      43             :   // Called when tearing down the isolate
      44       62432 :   virtual ~TimezoneCache() = default;
      45             : };
      46             : 
      47             : }  // namespace base
      48             : }  // namespace v8
      49             : 
      50             : #endif  // V8_BASE_TIMEZONE_CACHE_H_