dom/script/nsIScriptElement.cpp

   1
   2 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   3 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #include "nsIScriptElement.h"
   9
  10 #include "js/loader/ScriptKind.h"
  11 #include "mozilla/dom/Document.h"
  12 #include "mozilla/dom/ReferrerPolicyBinding.h"
  13 #include "nsIParser.h"
  14 #include "nsIWeakReference.h"
  15
  16 using JS::loader::ScriptKind;
  17
  18 bool nsIScriptElement::IsClassicNonAsyncDefer() {
  19   return mKind == ScriptKind::eClassic && !mAsync && !mDefer;
  20 }
  21
  22 void nsIScriptElement::SetCreatorParser(nsIParser* aParser) {
  23   mCreatorParser = do_GetWeakReference(aParser);
  24 }
  25
  26 void nsIScriptElement::UnblockParser() {
  27   if (!IsClassicNonAsyncDefer()) {
  28     MOZ_ASSERT_UNREACHABLE(
  29         "Tried to unblock parser for a script type that cannot block "
  30         "the parser.");
  31     return;
  32   }
  33   nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
  34   if (parser) {
  35     parser->UnblockParser();
  36   }
  37 }
  38
  39 void nsIScriptElement::ContinueParserAsync() {
  40   if (!IsClassicNonAsyncDefer()) {
  41     MOZ_ASSERT_UNREACHABLE(
  42         "Tried to continue after a script type that cannot block the parser.");
  43     return;
  44   }
  45   nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
  46   if (parser) {
  47     parser->ContinueInterruptedParsingAsync();
  48   }
  49 }
  50
  51 void nsIScriptElement::BeginEvaluating() {
  52   if (!IsClassicNonAsyncDefer()) {
  53     return;
  54   }
  55   nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
  56   if (parser) {
  57     parser->IncrementScriptNestingLevel();
  58   }
  59 }
  60
  61 void nsIScriptElement::EndEvaluating() {
  62   if (!IsClassicNonAsyncDefer()) {
  63     return;
  64   }
  65   nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
  66   if (parser) {
  67     parser->DecrementScriptNestingLevel();
  68   }
  69 }
  70
  71 already_AddRefed<nsIParser> nsIScriptElement::GetCreatorParser() {
  72   nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
  73   return parser.forget();
  74 }
  75
  76 mozilla::dom::ReferrerPolicy nsIScriptElement::GetReferrerPolicy() {
  77   return mozilla::dom::ReferrerPolicy::_empty;
  78 }
  79
  80 void nsIScriptElement::DetermineKindFromType(
  81     const mozilla::dom::Document* aOwnerDoc) {
  82   MOZ_ASSERT((mKind != ScriptKind::eModule) &&
  83              (mKind != ScriptKind::eImportMap) && !mAsync && !mDefer &&
  84              !mExternal);
  85
  86   nsAutoString type;
  87   GetScriptType(type);
  88
  89   if (!type.IsEmpty()) {
  90     if (type.LowerCaseEqualsASCII("module")) {
  91       mKind = ScriptKind::eModule;
  92     }
  93
  94     // https://html.spec.whatwg.org/multipage/scripting.html#prepare-the-script-element
  95     // Step 11. Otherwise, if the script block's type string is an ASCII
  96     // case-insensitive match for the string "importmap", then set el's type to
  97     // "importmap".
  98     if (type.LowerCaseEqualsASCII("importmap")) {
  99       mKind = ScriptKind::eImportMap;
 100     }
 101   }
 102 }