tor-browser

The Tor Browser
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nsIScriptElement.cpp (3274B)

      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 "nsIScriptElement.h"
      8 
      9 #include "js/loader/ScriptKind.h"
     10 #include "mozilla/dom/Document.h"
     11 #include "mozilla/dom/ReferrerPolicyBinding.h"
     12 #include "nsIParser.h"
     13 #include "nsIWeakReference.h"
     14 
     15 using JS::loader::ScriptKind;
     16 
     17 bool nsIScriptElement::IsClassicNonAsyncDefer() {
     18  return mKind == ScriptKind::eClassic && !mAsync && !mDefer;
     19 }
     20 
     21 void nsIScriptElement::SetCreatorParser(nsIParser* aParser) {
     22  mCreatorParser = do_GetWeakReference(aParser);
     23 }
     24 
     25 void nsIScriptElement::UnblockParser() {
     26  if (!IsClassicNonAsyncDefer()) {
     27    MOZ_ASSERT_UNREACHABLE(
     28        "Tried to unblock parser for a script type that cannot block "
     29        "the parser.");
     30    return;
     31  }
     32  nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
     33  if (parser) {
     34    parser->UnblockParser();
     35  }
     36 }
     37 
     38 void nsIScriptElement::ContinueParserAsync() {
     39  if (!IsClassicNonAsyncDefer()) {
     40    MOZ_ASSERT_UNREACHABLE(
     41        "Tried to continue after a script type that cannot block the parser.");
     42    return;
     43  }
     44  nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
     45  if (parser) {
     46    parser->ContinueInterruptedParsingAsync();
     47  }
     48 }
     49 
     50 void nsIScriptElement::BeginEvaluating() {
     51  if (!IsClassicNonAsyncDefer()) {
     52    return;
     53  }
     54  nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
     55  if (parser) {
     56    parser->IncrementScriptNestingLevel();
     57  }
     58 }
     59 
     60 void nsIScriptElement::EndEvaluating() {
     61  if (!IsClassicNonAsyncDefer()) {
     62    return;
     63  }
     64  nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
     65  if (parser) {
     66    parser->DecrementScriptNestingLevel();
     67  }
     68 }
     69 
     70 already_AddRefed<nsIParser> nsIScriptElement::GetCreatorParser() {
     71  nsCOMPtr<nsIParser> parser = do_QueryReferent(mCreatorParser);
     72  return parser.forget();
     73 }
     74 
     75 bool nsIScriptElement::AttemptToExecute(nsCOMPtr<nsIParser> aParser) {
     76  mDoneAddingChildren = true;
     77  bool block = MaybeProcessScript(aParser);
     78  if (!mAlreadyStarted) {
     79    // Need to lose parser-insertedness here to allow another script to cause
     80    // execution later.
     81    LoseParserInsertedness();
     82  }
     83  return block;
     84 }
     85 
     86 mozilla::dom::ReferrerPolicy nsIScriptElement::GetReferrerPolicy() {
     87  return mozilla::dom::ReferrerPolicy::_empty;
     88 }
     89 
     90 void nsIScriptElement::DetermineKindFromType(
     91    const mozilla::dom::Document* aOwnerDoc) {
     92  MOZ_ASSERT((mKind != ScriptKind::eModule) &&
     93             (mKind != ScriptKind::eImportMap) && !mAsync && !mDefer &&
     94             !mExternal);
     95 
     96  nsAutoString type;
     97  GetScriptType(type);
     98 
     99  if (!type.IsEmpty()) {
    100    if (type.LowerCaseEqualsASCII("module")) {
    101      mKind = ScriptKind::eModule;
    102    }
    103 
    104    // https://html.spec.whatwg.org/multipage/scripting.html#prepare-the-script-element
    105    // Step 11. Otherwise, if the script block's type string is an ASCII
    106    // case-insensitive match for the string "importmap", then set el's type to
    107    // "importmap".
    108    if (type.LowerCaseEqualsASCII("importmap")) {
    109      mKind = ScriptKind::eImportMap;
    110    }
    111  }
    112 }