Quelle HTMLStyleElement.cpp Sprache: C

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "mozilla/dom/HTMLStyleElement.h"
#include "mozilla/dom/HTMLStyleElementBinding.h"
#include "nsGkAtoms.h"
#include "nsStyleConsts.h"
#include "mozilla/dom/Document.h"
#include "mozilla/dom/FetchPriority.h"
#include "mozilla/dom/ReferrerInfo.h"
#include "nsUnicharUtils.h"
#include "nsThreadUtils.h"
#include "nsContentUtils.h"
#include "nsStubMutationObserver.h"
#include "nsDOMTokenList.h"

NS_IMPL_NS_NEW_HTML_ELEMENT(Style)

namespace mozilla::dom {

HTMLStyleElement::HTMLStyleElement(
    already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo)
    : nsGenericHTMLElement(std::move(aNodeInfo)) {
  AddMutationObserver(this);
}

HTMLStyleElement::~HTMLStyleElement() = default;

NS_IMPL_CYCLE_COLLECTION_CLASS(HTMLStyleElement)

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(HTMLStyleElement,
                                                  nsGenericHTMLElement)
  tmp->LinkStyle::Traverse(cb);
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mBlocking)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(HTMLStyleElement,
                                                nsGenericHTMLElement)
  tmp->LinkStyle::Unlink();
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mBlocking)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_ISUPPORTS_CYCLE_COLLECTION_INHERITED(HTMLStyleElement,
                                             nsGenericHTMLElement,
                                             nsIMutationObserver)

NS_IMPL_ELEMENT_CLONE(HTMLStyleElement)

bool HTMLStyleElement::Disabled() const {
  StyleSheet* ss = GetSheet();
  return ss && ss->Disabled();
}

void HTMLStyleElement::SetDisabled(bool aDisabled) {
  if (StyleSheet* ss = GetSheet()) {
    ss->SetDisabled(aDisabled);
  }
}

void HTMLStyleElement::CharacterDataChanged(nsIContent* aContent,
                                            const CharacterDataChangeInfo&) {
  ContentChanged(aContent);
}

void HTMLStyleElement::ContentAppended(nsIContent* aFirstNewContent) {
  ContentChanged(aFirstNewContent->GetParent());
}

void HTMLStyleElement::ContentInserted(nsIContent* aChild) {
  ContentChanged(aChild);
}

void HTMLStyleElement::ContentWillBeRemoved(nsIContent* aChild,
                                            const BatchRemovalState* aState) {
  mTriggeringPrincipal = nullptr;
  if (!nsContentUtils::IsInSameAnonymousTree(this, aChild)) {
    return;
  }
  if (aState && !aState->mIsFirst) {
    return;
  }
  // Make sure to run this once the removal has taken place.
  nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
      "HTMLStyleElement::ContentWillBeRemoved",
      [self = RefPtr{this}] { self->UpdateStyleSheetInternal(); }));
}

void HTMLStyleElement::ContentChanged(nsIContent* aContent) {
  mTriggeringPrincipal = nullptr;
  if (nsContentUtils::IsInSameAnonymousTree(this, aContent)) {
    Unused << UpdateStyleSheetInternal(nullptr, nullptr);
  }
}

nsresult HTMLStyleElement::BindToTree(BindContext& aContext, nsINode& aParent) {
  nsresult rv = nsGenericHTMLElement::BindToTree(aContext, aParent);
  NS_ENSURE_SUCCESS(rv, rv);
  LinkStyle::BindToTree();
  return rv;
}

void HTMLStyleElement::UnbindFromTree(UnbindContext& aContext) {
  RefPtr<Document> oldDoc = GetUncomposedDoc();
  ShadowRoot* oldShadow = GetContainingShadow();

  nsGenericHTMLElement::UnbindFromTree(aContext);

  Unused << UpdateStyleSheetInternal(oldDoc, oldShadow);
}

bool HTMLStyleElement::ParseAttribute(int32_t aNamespaceID, nsAtom* aAttribute,
                                      const nsAString& aValue,
                                      nsIPrincipal* aMaybeScriptedPrincipal,
                                      nsAttrValue& aResult) {
  if (aNamespaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::blocking &&
      StaticPrefs::dom_element_blocking_enabled()) {
    aResult.ParseAtomArray(aValue);
    return true;
  }

  return nsGenericHTMLElement::ParseAttribute(aNamespaceID, aAttribute, aValue,
                                              aMaybeScriptedPrincipal, aResult);
}

void HTMLStyleElement::AfterSetAttr(int32_t aNameSpaceID, nsAtom* aName,
                                    const nsAttrValue* aValue,
                                    const nsAttrValue* aOldValue,
                                    nsIPrincipal* aSubjectPrincipal,
                                    bool aNotify) {
  if (aNameSpaceID == kNameSpaceID_None) {
    if (aName == nsGkAtoms::title || aName == nsGkAtoms::media ||
        aName == nsGkAtoms::type) {
      Unused << UpdateStyleSheetInternal(nullptr, nullptr, ForceUpdate::Yes);
    }
  }

  return nsGenericHTMLElement::AfterSetAttr(
      aNameSpaceID, aName, aValue, aOldValue, aSubjectPrincipal, aNotify);
}

void HTMLStyleElement::GetInnerHTML(nsAString& aInnerHTML,
                                    OOMReporter& aError) {
  if (!nsContentUtils::GetNodeTextContent(this, false, aInnerHTML, fallible)) {
    aError.ReportOOM();
  }
}

void HTMLStyleElement::SetInnerHTMLTrusted(const nsAString& aInnerHTML,
                                           nsIPrincipal* aSubjectPrincipal,
                                           ErrorResult& aError) {
  SetTextContentInternal(aInnerHTML, aSubjectPrincipal, aError);
}

void HTMLStyleElement::SetTextContentInternal(const nsAString& aTextContent,
                                              nsIPrincipal* aScriptedPrincipal,
                                              ErrorResult& aError) {
  // Per spec, if we're setting text content to an empty string and don't
  // already have any children, we should not trigger any mutation observers, or
  // re-parse the stylesheet.
  if (aTextContent.IsEmpty() && !GetFirstChild()) {
    nsIPrincipal* principal =
        mTriggeringPrincipal ? mTriggeringPrincipal.get() : NodePrincipal();
    if (principal == aScriptedPrincipal) {
      return;
    }
  }

  const bool updatesWereEnabled = mUpdatesEnabled;
  DisableUpdates();

  aError = nsContentUtils::SetNodeTextContent(this, aTextContent, true);
  if (updatesWereEnabled) {
    mTriggeringPrincipal = aScriptedPrincipal;
    Unused << EnableUpdatesAndUpdateStyleSheet(nullptr);
  }
}

void HTMLStyleElement::SetDevtoolsAsTriggeringPrincipal() {
  mTriggeringPrincipal = CreateDevtoolsPrincipal();
}

Maybe<LinkStyle::SheetInfo> HTMLStyleElement::GetStyleSheetInfo() {
  if (!IsCSSMimeTypeAttributeForStyleElement(*this)) {
    return Nothing();
  }

  nsAutoString title;
  nsAutoString media;
  GetTitleAndMediaForElement(*this, title, media);

  return Some(SheetInfo{
      *OwnerDoc(),
      this,
      nullptr,
      do_AddRef(mTriggeringPrincipal),
      MakeAndAddRef<ReferrerInfo>(*this),
      CORS_NONE,
      title,
      media,
      /* integrity = */ u""_ns,
      /* nsStyleUtil::CSPAllowsInlineStyle takes care of nonce checking for
         inline styles. Bug 1607011 */
      /* nonce = */ u""_ns,
      HasAlternateRel::No,
      IsInline::Yes,
      IsExplicitlyEnabled::No,
      FetchPriority::Auto,
  });
}

JSObject* HTMLStyleElement::WrapNode(JSContext* aCx,
                                     JS::Handle<JSObject*> aGivenProto) {
  return HTMLStyleElement_Binding::Wrap(aCx, this, aGivenProto);
}

nsDOMTokenList* HTMLStyleElement::Blocking() {
  if (!mBlocking) {
    mBlocking =
        new nsDOMTokenList(this, nsGkAtoms::blocking, sSupportedBlockingValues);
  }
  return mBlocking;
}

bool HTMLStyleElement::IsPotentiallyRenderBlocking() {
  return BlockingContainsRender();

  // TODO: handle implicitly potentially render blocking
  // https://html.spec.whatwg.org/#implicitly-potentially-render-blocking
  // A style element is implicitly potentially render-blocking if the element
  // was created by its node document's parser.
}

}  // namespace mozilla::dom

quality100%

¤ Dauer der Verarbeitung: 0.11 Sekunden (vorverarbeitet) ¤

Wurzel

Suchen

Beweissystem der NASA

Beweissystem Isabelle

NIST Cobol Testsuite

Cephes Mathematical Library

Wiener Entwicklungsmethode

Haftungshinweis

Die Informationen auf dieser Webseite wurden nach bestem Wissen sorgfältig zusammengestellt. Es wird jedoch weder Vollständigkeit, noch Richtigkeit, noch Qualität der bereit gestellten Informationen zugesichert.

Bemerkung:

Die farbliche Syntaxdarstellung ist noch experimentell.