Quellcode-Bibliothek HTMLAllCollection.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/HTMLAllCollection.h"

#include "jsfriendapi.h"
#include "mozilla/dom/HTMLAllCollectionBinding.h"
#include "mozilla/dom/Nullable.h"
#include "mozilla/dom/Element.h"
#include "nsContentList.h"
#include "nsGenericHTMLElement.h"

namespace mozilla::dom {

HTMLAllCollection::HTMLAllCollection(mozilla::dom::Document* aDocument)
    : mDocument(aDocument) {
  MOZ_ASSERT(mDocument);
}

HTMLAllCollection::~HTMLAllCollection() = default;

NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(HTMLAllCollection, mDocument, mCollection,
                                      mNamedMap)

NS_IMPL_CYCLE_COLLECTING_ADDREF(HTMLAllCollection)
NS_IMPL_CYCLE_COLLECTING_RELEASE(HTMLAllCollection)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(HTMLAllCollection)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

nsINode* HTMLAllCollection::GetParentObject() const { return mDocument; }

uint32_t HTMLAllCollection::Length() { return Collection()->Length(true); }

Element* HTMLAllCollection::Item(uint32_t aIndex) {
  nsIContent* item = Collection()->Item(aIndex);
  return item ? item->AsElement() : nullptr;
}

void HTMLAllCollection::Item(const Optional<nsAString>& aNameOrIndex,
                             Nullable<OwningHTMLCollectionOrElement>& aResult) {
  if (!aNameOrIndex.WasPassed()) {
    aResult.SetNull();
    return;
  }

  const nsAString& nameOrIndex = aNameOrIndex.Value();
  uint32_t indexVal;
  if (js::StringIsArrayIndex(nameOrIndex.BeginReading(), nameOrIndex.Length(),
                             &indexVal)) {
    Element* element = Item(indexVal);
    if (element) {
      aResult.SetValue().SetAsElement() = element;
    } else {
      aResult.SetNull();
    }
    return;
  }

  NamedItem(nameOrIndex, aResult);
}

nsContentList* HTMLAllCollection::Collection() {
  if (!mCollection) {
    Document* document = mDocument;
    mCollection = document->GetElementsByTagName(u"*"_ns);
    MOZ_ASSERT(mCollection);
  }
  return mCollection;
}

static bool IsAllNamedElement(nsIContent* aContent) {
  return aContent->IsAnyOfHTMLElements(
      nsGkAtoms::a, nsGkAtoms::button, nsGkAtoms::embed, nsGkAtoms::form,
      nsGkAtoms::iframe, nsGkAtoms::img, nsGkAtoms::input, nsGkAtoms::map,
      nsGkAtoms::meta, nsGkAtoms::object, nsGkAtoms::select,
      nsGkAtoms::textarea, nsGkAtoms::frame, nsGkAtoms::frameset);
}

static bool DocAllResultMatch(Element* aElement, int32_t aNamespaceID,
                              nsAtom* aAtom, void* aData) {
  if (aElement->GetID() == aAtom) {
    return true;
  }

  nsGenericHTMLElement* elm = nsGenericHTMLElement::FromNode(aElement);
  if (!elm) {
    return false;
  }

  if (!IsAllNamedElement(elm)) {
    return false;
  }

  const nsAttrValue* val = elm->GetParsedAttr(nsGkAtoms::name);
  return val && val->Type() == nsAttrValue::eAtom &&
         val->GetAtomValue() == aAtom;
}

nsContentList* HTMLAllCollection::GetDocumentAllList(const nsAString& aID) {
  return mNamedMap
      .LookupOrInsertWith(aID,
                          [this, &aID] {
                            RefPtr<nsAtom> id = NS_Atomize(aID);
                            return new nsContentList(mDocument,
                                                     DocAllResultMatch, nullptr,
                                                     nullptr, true, id);
                          })
      .get();
}

void HTMLAllCollection::NamedGetter(
    const nsAString& aID, bool& aFound,
    Nullable<OwningHTMLCollectionOrElement>& aResult) {
  if (aID.IsEmpty()) {
    aFound = false;
    aResult.SetNull();
    return;
  }

  nsContentList* docAllList = GetDocumentAllList(aID);
  if (!docAllList) {
    aFound = false;
    aResult.SetNull();
    return;
  }

  // Check if there are more than 1 entries. Do this by getting the second one
  // rather than the length since getting the length always requires walking
  // the entire document.
  if (docAllList->Item(1, true)) {
    aFound = true;
    aResult.SetValue().SetAsHTMLCollection() = docAllList;
    return;
  }

  // There's only 0 or 1 items. Return the first one or null.
  if (nsIContent* node = docAllList->Item(0, true)) {
    aFound = true;
    aResult.SetValue().SetAsElement() = node->AsElement();
    return;
  }

  aFound = false;
  aResult.SetNull();
}

void HTMLAllCollection::GetSupportedNames(nsTArray<nsString>& aNames) {
  // XXXbz this is very similar to nsContentList::GetSupportedNames,
  // but has to check IsAllNamedElement for the name case.
  AutoTArray<nsAtom*, 8> atoms;
  for (uint32_t i = 0; i < Length(); ++i) {
    nsIContent* content = Item(i);
    if (content->HasID()) {
      nsAtom* id = content->GetID();
      MOZ_ASSERT(id != nsGkAtoms::_empty, "Empty ids don't get atomized");
      if (!atoms.Contains(id)) {
        atoms.AppendElement(id);
      }
    }

    nsGenericHTMLElement* el = nsGenericHTMLElement::FromNode(content);
    if (el) {
      // Note: nsINode::HasName means the name is exposed on the document,
      // which is false for options, so we don't check it here.
      const nsAttrValue* val = el->GetParsedAttr(nsGkAtoms::name);
      if (val && val->Type() == nsAttrValue::eAtom &&
          IsAllNamedElement(content)) {
        nsAtom* name = val->GetAtomValue();
        MOZ_ASSERT(name != nsGkAtoms::_empty, "Empty names don't get atomized");
        if (!atoms.Contains(name)) {
          atoms.AppendElement(name);
        }
      }
    }
  }

  uint32_t atomsLen = atoms.Length();
  nsString* names = aNames.AppendElements(atomsLen);
  for (uint32_t i = 0; i < atomsLen; ++i) {
    atoms[i]->ToString(names[i]);
  }
}

JSObject* HTMLAllCollection::WrapObject(JSContext* aCx,
                                        JS::Handle<JSObject*> aGivenProto) {
  return HTMLAllCollection_Binding::Wrap(aCx, this, aGivenProto);
}

}  // namespace mozilla::dom

quality95%

¤ 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.0.14Bemerkung: (vorverarbeitet) ¤

*Bot Zugriff

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.