dom/html/FetchPriority.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "mozilla/dom/FetchPriority.h"
   8
   9 #include "mozilla/Assertions.h"
  10 #include "mozilla/Logging.h"
  11 #include "mozilla/dom/RequestBinding.h"
  12 #include "nsISupportsPriority.h"
  13 #include "nsStringFwd.h"
  14
  15 namespace mozilla::dom {
  16 const char* kFetchPriorityAttributeValueHigh = "high";
  17 const char* kFetchPriorityAttributeValueLow = "low";
  18 const char* kFetchPriorityAttributeValueAuto = "auto";
  19
  20 FetchPriority ToFetchPriority(RequestPriority aRequestPriority) {
  21   switch (aRequestPriority) {
  22     case RequestPriority::High: {
  23       return FetchPriority::High;
  24     }
  25     case RequestPriority::Low: {
  26       return FetchPriority::Low;
  27     }
  28     case RequestPriority::Auto: {
  29       return FetchPriority::Auto;
  30     }
  31     default: {
  32       MOZ_ASSERT_UNREACHABLE();
  33       return FetchPriority::Auto;
  34     }
  35   }
  36 }
  37
  38 #ifdef DEBUG
  39 constexpr auto kPriorityHighest = "PRIORITY_HIGHEST"_ns;
  40 constexpr auto kPriorityHigh = "PRIORITY_HIGH"_ns;
  41 constexpr auto kPriorityNormal = "PRIORITY_NORMAL"_ns;
  42 constexpr auto kPriorityLow = "PRIORITY_LOW"_ns;
  43 constexpr auto kPriorityLowest = "PRIORITY_LOWEST"_ns;
  44 constexpr auto kPriorityUnknown = "UNKNOWN"_ns;
  45
  46 /**
  47  * See <nsISupportsPriority.idl>.
  48  */
  49 static void SupportsPriorityToString(int32_t aSupportsPriority,
  50                                      nsACString& aResult) {
  51   switch (aSupportsPriority) {
  52     case nsISupportsPriority::PRIORITY_HIGHEST: {
  53       aResult = kPriorityHighest;
  54       break;
  55     }
  56     case nsISupportsPriority::PRIORITY_HIGH: {
  57       aResult = kPriorityHigh;
  58       break;
  59     }
  60     case nsISupportsPriority::PRIORITY_NORMAL: {
  61       aResult = kPriorityNormal;
  62       break;
  63     }
  64     case nsISupportsPriority::PRIORITY_LOW: {
  65       aResult = kPriorityLow;
  66       break;
  67     }
  68     case nsISupportsPriority::PRIORITY_LOWEST: {
  69       aResult = kPriorityLowest;
  70       break;
  71     }
  72     default: {
  73       aResult = kPriorityUnknown;
  74       break;
  75     }
  76   }
  77 }
  78
  79 static const char* ToString(FetchPriority aFetchPriority) {
  80   switch (aFetchPriority) {
  81     case FetchPriority::Auto: {
  82       return kFetchPriorityAttributeValueAuto;
  83     }
  84     case FetchPriority::Low: {
  85       return kFetchPriorityAttributeValueLow;
  86     }
  87     case FetchPriority::High: {
  88       return kFetchPriorityAttributeValueHigh;
  89     }
  90     default: {
  91       MOZ_ASSERT_UNREACHABLE();
  92       return kFetchPriorityAttributeValueAuto;
  93     }
  94   }
  95 }
  96 #endif  // DEBUG
  97
  98 void LogPriorityMapping(LazyLogModule& aLazyLogModule,
  99                         FetchPriority aFetchPriority,
 100                         int32_t aSupportsPriority) {
 101 #ifdef DEBUG
 102   nsDependentCString supportsPriority;
 103   SupportsPriorityToString(aSupportsPriority, supportsPriority);
 104   MOZ_LOG(aLazyLogModule, LogLevel::Debug,
 105           ("Mapping priority: %s -> %s", ToString(aFetchPriority),
 106            supportsPriority.get()));
 107 #endif  // DEBUG
 108 }
 109 }  // namespace mozilla::dom