DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Header

Mercurial (23c4fa49cc5c)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411
/* -*- 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/. */

/*
 * Implementation of the |attributes| property of DOM Core's Element object.
 */

#include "nsDOMAttributeMap.h"

#include "mozilla/MemoryReporting.h"
#include "mozilla/dom/Attr.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/NamedNodeMapBinding.h"
#include "mozilla/dom/NodeInfoInlines.h"
#include "nsAttrName.h"
#include "nsContentUtils.h"
#include "nsError.h"
#include "nsIContentInlines.h"
#include "mozilla/dom/Document.h"
#include "nsNameSpaceManager.h"
#include "nsNodeInfoManager.h"
#include "nsUnicharUtils.h"
#include "nsWrapperCacheInlines.h"

using namespace mozilla;
using namespace mozilla::dom;

//----------------------------------------------------------------------

nsDOMAttributeMap::nsDOMAttributeMap(Element* aContent) : mContent(aContent) {
  // We don't add a reference to our content. If it goes away,
  // we'll be told to drop our reference
}

nsDOMAttributeMap::~nsDOMAttributeMap() { DropReference(); }

void nsDOMAttributeMap::DropReference() {
  for (auto iter = mAttributeCache.Iter(); !iter.Done(); iter.Next()) {
    iter.Data()->SetMap(nullptr);
    iter.Remove();
  }
  mContent = nullptr;
}

NS_IMPL_CYCLE_COLLECTION_CLASS(nsDOMAttributeMap)

NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsDOMAttributeMap)
  tmp->DropReference();
  NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
  NS_IMPL_CYCLE_COLLECTION_UNLINK(mContent)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END

NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsDOMAttributeMap)
  for (auto iter = tmp->mAttributeCache.Iter(); !iter.Done(); iter.Next()) {
    cb.NoteXPCOMChild(static_cast<nsINode*>(iter.Data().get()));
  }
  NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mContent)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END

NS_IMPL_CYCLE_COLLECTION_TRACE_WRAPPERCACHE(nsDOMAttributeMap)

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_BEGIN(nsDOMAttributeMap)
  if (tmp->HasKnownLiveWrapper()) {
    if (tmp->mContent) {
      // The map owns the element so we can mark it when the
      // map itself is certainly alive.
      mozilla::dom::FragmentOrElement::MarkNodeChildren(tmp->mContent);
    }
    return true;
  }
  if (tmp->mContent &&
      mozilla::dom::FragmentOrElement::CanSkip(tmp->mContent, true)) {
    return true;
  }
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_END

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_BEGIN(nsDOMAttributeMap)
  return tmp->HasKnownLiveWrapperAndDoesNotNeedTracing(tmp);
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_IN_CC_END

NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_BEGIN(nsDOMAttributeMap)
  return tmp->HasKnownLiveWrapper();
NS_IMPL_CYCLE_COLLECTION_CAN_SKIP_THIS_END

// QueryInterface implementation for nsDOMAttributeMap

NS_INTERFACE_MAP_BEGIN(nsDOMAttributeMap)
  NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
  NS_INTERFACE_MAP_ENTRIES_CYCLE_COLLECTION(nsDOMAttributeMap)
  NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END

NS_IMPL_CYCLE_COLLECTING_ADDREF(nsDOMAttributeMap)
NS_IMPL_CYCLE_COLLECTING_RELEASE(nsDOMAttributeMap)

nsresult nsDOMAttributeMap::SetOwnerDocument(Document* aDocument) {
  for (auto iter = mAttributeCache.Iter(); !iter.Done(); iter.Next()) {
    nsresult rv = iter.Data()->SetOwnerDocument(aDocument);
    NS_ENSURE_SUCCESS(rv, NS_ERROR_FAILURE);
  }
  return NS_OK;
}

void nsDOMAttributeMap::DropAttribute(int32_t aNamespaceID,
                                      nsAtom* aLocalName) {
  nsAttrKey attr(aNamespaceID, aLocalName);
  if (auto entry = mAttributeCache.Lookup(attr)) {
    entry.Data()->SetMap(nullptr);  // break link to map
    entry.Remove();
  }
}

Attr* nsDOMAttributeMap::GetAttribute(mozilla::dom::NodeInfo* aNodeInfo) {
  NS_ASSERTION(aNodeInfo, "GetAttribute() called with aNodeInfo == nullptr!");

  nsAttrKey attr(aNodeInfo->NamespaceID(), aNodeInfo->NameAtom());

  RefPtr<Attr>& entryValue = mAttributeCache.GetOrInsert(attr);
  Attr* node = entryValue;
  if (!node) {
    // Newly inserted entry!
    RefPtr<mozilla::dom::NodeInfo> ni = aNodeInfo;
    entryValue = new Attr(this, ni.forget(), EmptyString());
    node = entryValue;
  }

  return node;
}

Attr* nsDOMAttributeMap::NamedGetter(const nsAString& aAttrName, bool& aFound) {
  aFound = false;
  NS_ENSURE_TRUE(mContent, nullptr);

  RefPtr<mozilla::dom::NodeInfo> ni =
      mContent->GetExistingAttrNameFromQName(aAttrName);
  if (!ni) {
    return nullptr;
  }

  aFound = true;
  return GetAttribute(ni);
}

void nsDOMAttributeMap::GetSupportedNames(nsTArray<nsString>& aNames) {
  // For HTML elements in HTML documents, only include names that are still the
  // same after ASCII-lowercasing, since our named getter will end up
  // ASCII-lowercasing the given string.
  bool lowercaseNamesOnly =
      mContent->IsHTMLElement() && mContent->IsInHTMLDocument();

  const uint32_t count = mContent->GetAttrCount();
  bool seenNonAtomName = false;
  for (uint32_t i = 0; i < count; i++) {
    const nsAttrName* name = mContent->GetAttrNameAt(i);
    seenNonAtomName = seenNonAtomName || !name->IsAtom();
    nsString qualifiedName;
    name->GetQualifiedName(qualifiedName);

    if (lowercaseNamesOnly &&
        nsContentUtils::StringContainsASCIIUpper(qualifiedName)) {
      continue;
    }

    // Omit duplicates.  We only need to do this check if we've seen a non-atom
    // name, because that's the only way we can have two identical qualified
    // names.
    if (seenNonAtomName && aNames.Contains(qualifiedName)) {
      continue;
    }

    aNames.AppendElement(qualifiedName);
  }
}

Attr* nsDOMAttributeMap::GetNamedItem(const nsAString& aAttrName) {
  bool dummy;
  return NamedGetter(aAttrName, dummy);
}

already_AddRefed<Attr> nsDOMAttributeMap::SetNamedItemNS(Attr& aAttr,
                                                         ErrorResult& aError) {
  NS_ENSURE_TRUE(mContent, nullptr);

  // XXX should check same-origin between mContent and aAttr however
  // nsContentUtils::CheckSameOrigin can't deal with attributenodes yet

  // Check that attribute is not owned by somebody else
  nsDOMAttributeMap* owner = aAttr.GetMap();
  if (owner) {
    if (owner != this) {
      aError.Throw(NS_ERROR_DOM_INUSE_ATTRIBUTE_ERR);
      return nullptr;
    }

    // setting a preexisting attribute is a no-op, just return the same
    // node.
    RefPtr<Attr> attribute = &aAttr;
    return attribute.forget();
  }

  nsresult rv;
  if (mContent->OwnerDoc() != aAttr.OwnerDoc()) {
    DebugOnly<void*> adoptedNode =
        mContent->OwnerDoc()->AdoptNode(aAttr, aError);
    if (aError.Failed()) {
      return nullptr;
    }

    NS_ASSERTION(adoptedNode == &aAttr, "Uh, adopt node changed nodes?");
  }

  // Get nodeinfo and preexisting attribute (if it exists)
  RefPtr<NodeInfo> oldNi;

  uint32_t i, count = mContent->GetAttrCount();
  for (i = 0; i < count; ++i) {
    const nsAttrName* name = mContent->GetAttrNameAt(i);
    int32_t attrNS = name->NamespaceID();
    nsAtom* nameAtom = name->LocalName();

    // we're purposefully ignoring the prefix.
    if (aAttr.NodeInfo()->Equals(nameAtom, attrNS)) {
      oldNi = mContent->NodeInfo()->NodeInfoManager()->GetNodeInfo(
          nameAtom, name->GetPrefix(), aAttr.NodeInfo()->NamespaceID(),
          nsINode::ATTRIBUTE_NODE);
      break;
    }
  }

  RefPtr<Attr> oldAttr;

  if (oldNi) {
    oldAttr = GetAttribute(oldNi);

    if (oldAttr == &aAttr) {
      return oldAttr.forget();
    }

    if (oldAttr) {
      // Just remove it from our hashtable.  This has no side-effects, so we
      // don't have to recheck anything after we do it.  Then we'll add our new
      // Attr to the hashtable and do the actual attr set on the element.  This
      // will make the whole thing look like a single attribute mutation (with
      // the new attr node in place) as opposed to a removal and addition.
      DropAttribute(oldNi->NamespaceID(), oldNi->NameAtom());
    }
  }

  nsAutoString value;
  aAttr.GetValue(value);

  RefPtr<NodeInfo> ni = aAttr.NodeInfo();

  // Add the new attribute to the attribute map before updating
  // its value in the element. @see bug 364413.
  nsAttrKey attrkey(ni->NamespaceID(), ni->NameAtom());
  mAttributeCache.Put(attrkey, &aAttr);
  aAttr.SetMap(this);

  rv = mContent->SetAttr(ni->NamespaceID(), ni->NameAtom(), ni->GetPrefixAtom(),
                         value, true);
  if (NS_FAILED(rv)) {
    DropAttribute(ni->NamespaceID(), ni->NameAtom());
    aError.Throw(rv);
    return nullptr;
  }

  return oldAttr.forget();
}

already_AddRefed<Attr> nsDOMAttributeMap::RemoveNamedItem(NodeInfo* aNodeInfo,
                                                          ErrorResult& aError) {
  RefPtr<Attr> attribute = GetAttribute(aNodeInfo);
  // This removes the attribute node from the attribute map.
  aError = mContent->UnsetAttr(aNodeInfo->NamespaceID(), aNodeInfo->NameAtom(),
                               true);
  return attribute.forget();
}

already_AddRefed<Attr> nsDOMAttributeMap::RemoveNamedItem(
    const nsAString& aName, ErrorResult& aError) {
  if (!mContent) {
    aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
    return nullptr;
  }

  RefPtr<mozilla::dom::NodeInfo> ni =
      mContent->GetExistingAttrNameFromQName(aName);
  if (!ni) {
    aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
    return nullptr;
  }

  return RemoveNamedItem(ni, aError);
}

Attr* nsDOMAttributeMap::IndexedGetter(uint32_t aIndex, bool& aFound) {
  aFound = false;
  NS_ENSURE_TRUE(mContent, nullptr);

  const nsAttrName* name = mContent->GetAttrNameAt(aIndex);
  NS_ENSURE_TRUE(name, nullptr);

  aFound = true;
  // Don't use the nodeinfo even if one exists since it can have the wrong
  // owner document.
  RefPtr<mozilla::dom::NodeInfo> ni =
      mContent->NodeInfo()->NodeInfoManager()->GetNodeInfo(
          name->LocalName(), name->GetPrefix(), name->NamespaceID(),
          nsINode::ATTRIBUTE_NODE);
  return GetAttribute(ni);
}

Attr* nsDOMAttributeMap::Item(uint32_t aIndex) {
  bool dummy;
  return IndexedGetter(aIndex, dummy);
}

uint32_t nsDOMAttributeMap::Length() const {
  NS_ENSURE_TRUE(mContent, 0);

  return mContent->GetAttrCount();
}

Attr* nsDOMAttributeMap::GetNamedItemNS(const nsAString& aNamespaceURI,
                                        const nsAString& aLocalName) {
  RefPtr<mozilla::dom::NodeInfo> ni =
      GetAttrNodeInfo(aNamespaceURI, aLocalName);
  if (!ni) {
    return nullptr;
  }

  return GetAttribute(ni);
}

already_AddRefed<mozilla::dom::NodeInfo> nsDOMAttributeMap::GetAttrNodeInfo(
    const nsAString& aNamespaceURI, const nsAString& aLocalName) {
  if (!mContent) {
    return nullptr;
  }

  int32_t nameSpaceID = kNameSpaceID_None;

  if (!aNamespaceURI.IsEmpty()) {
    nameSpaceID = nsContentUtils::NameSpaceManager()->GetNameSpaceID(
        aNamespaceURI, nsContentUtils::IsChromeDoc(mContent->OwnerDoc()));

    if (nameSpaceID == kNameSpaceID_Unknown) {
      return nullptr;
    }
  }

  uint32_t i, count = mContent->GetAttrCount();
  for (i = 0; i < count; ++i) {
    const nsAttrName* name = mContent->GetAttrNameAt(i);
    int32_t attrNS = name->NamespaceID();
    nsAtom* nameAtom = name->LocalName();

    // we're purposefully ignoring the prefix.
    if (nameSpaceID == attrNS && nameAtom->Equals(aLocalName)) {
      RefPtr<mozilla::dom::NodeInfo> ni;
      ni = mContent->NodeInfo()->NodeInfoManager()->GetNodeInfo(
          nameAtom, name->GetPrefix(), nameSpaceID, nsINode::ATTRIBUTE_NODE);

      return ni.forget();
    }
  }

  return nullptr;
}

already_AddRefed<Attr> nsDOMAttributeMap::RemoveNamedItemNS(
    const nsAString& aNamespaceURI, const nsAString& aLocalName,
    ErrorResult& aError) {
  RefPtr<mozilla::dom::NodeInfo> ni =
      GetAttrNodeInfo(aNamespaceURI, aLocalName);
  if (!ni) {
    aError.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
    return nullptr;
  }

  return RemoveNamedItem(ni, aError);
}

uint32_t nsDOMAttributeMap::Count() const { return mAttributeCache.Count(); }

size_t nsDOMAttributeMap::SizeOfIncludingThis(
    MallocSizeOf aMallocSizeOf) const {
  size_t n = aMallocSizeOf(this);

  n += mAttributeCache.ShallowSizeOfExcludingThis(aMallocSizeOf);
  for (auto iter = mAttributeCache.ConstIter(); !iter.Done(); iter.Next()) {
    n += aMallocSizeOf(iter.Data().get());
  }

  // NB: mContent is non-owning and thus not counted.
  return n;
}

/* virtual */
JSObject* nsDOMAttributeMap::WrapObject(JSContext* aCx,
                                        JS::Handle<JSObject*> aGivenProto) {
  return NamedNodeMap_Binding::Wrap(aCx, this, aGivenProto);
}

DocGroup* nsDOMAttributeMap::GetDocGroup() const {
  return mContent ? mContent->OwnerDoc()->GetDocGroup() : nullptr;
}