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.

Implementation

Mercurial (b6d82b1a6b02)

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
/* -*- 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/. */

#ifndef nsNodeUtils_h___
#define nsNodeUtils_h___

#include "mozilla/Maybe.h"
#include "nsIContent.h"  // for use in inline function (ParentChainChanged)
#include "nsIMutationObserver.h"  // for use in inline function (ParentChainChanged)
#include "js/TypeDecls.h"
#include "nsCOMArray.h"

struct CharacterDataChangeInfo;
template <class E>
class nsCOMArray;
class nsCycleCollectionTraversalCallback;
namespace mozilla {
struct NonOwningAnimationTarget;
class ErrorResult;
namespace dom {
class Animation;
}  // namespace dom
}  // namespace mozilla

class nsNodeUtils {
 public:
  /**
   * Send CharacterDataWillChange notifications to nsIMutationObservers.
   * @param aContent  Node whose data changed
   * @param aInfo     Struct with information details about the change
   * @see nsIMutationObserver::CharacterDataWillChange
   */
  static void CharacterDataWillChange(nsIContent* aContent,
                                      const CharacterDataChangeInfo&);

  /**
   * Send CharacterDataChanged notifications to nsIMutationObservers.
   * @param aContent  Node whose data changed
   * @param aInfo     Struct with information details about the change
   * @see nsIMutationObserver::CharacterDataChanged
   */
  static void CharacterDataChanged(nsIContent* aContent,
                                   const CharacterDataChangeInfo&);

  /**
   * Send AttributeWillChange notifications to nsIMutationObservers.
   * @param aElement      Element whose data will change
   * @param aNameSpaceID  Namespace of changing attribute
   * @param aAttribute    Local-name of changing attribute
   * @param aModType      Type of change (add/change/removal)
   * @param aNewValue     The parsed new value, but only if BeforeSetAttr
   *                      preparsed it!!!
   * @see nsIMutationObserver::AttributeWillChange
   */
  static void AttributeWillChange(mozilla::dom::Element* aElement,
                                  int32_t aNameSpaceID, nsAtom* aAttribute,
                                  int32_t aModType);

  /**
   * Send AttributeChanged notifications to nsIMutationObservers.
   * @param aElement      Element whose data changed
   * @param aNameSpaceID  Namespace of changed attribute
   * @param aAttribute    Local-name of changed attribute
   * @param aModType      Type of change (add/change/removal)
   * @param aOldValue     If the old value was StoresOwnData() (or absent),
   *                      that value, otherwise null
   * @see nsIMutationObserver::AttributeChanged
   */
  static void AttributeChanged(mozilla::dom::Element* aElement,
                               int32_t aNameSpaceID, nsAtom* aAttribute,
                               int32_t aModType, const nsAttrValue* aOldValue);

  /**
   * Send AttributeSetToCurrentValue notifications to nsIMutationObservers.
   * @param aElement      Element whose data changed
   * @param aNameSpaceID  Namespace of the attribute
   * @param aAttribute    Local-name of the attribute
   * @see nsIMutationObserver::AttributeSetToCurrentValue
   */
  static void AttributeSetToCurrentValue(mozilla::dom::Element* aElement,
                                         int32_t aNameSpaceID,
                                         nsAtom* aAttribute);

  /**
   * Send ContentAppended notifications to nsIMutationObservers
   * @param aContainer           Node into which new child/children were added
   * @param aFirstNewContent     First new child
   * @see nsIMutationObserver::ContentAppended
   */
  static void ContentAppended(nsIContent* aContainer,
                              nsIContent* aFirstNewContent);

  /**
   * Send NativeAnonymousChildList notifications to nsIMutationObservers
   * @param aContent             Anonymous node that's been added or removed
   * @param aIsRemove            True if it's a removal, false if an addition
   * @see nsIMutationObserver::NativeAnonymousChildListChange
   */
  static void NativeAnonymousChildListChange(nsIContent* aContent,
                                             bool aIsRemove);

  /**
   * Send ContentInserted notifications to nsIMutationObservers
   * @param aContainer        Node into which new child was inserted
   * @param aChild            Newly inserted child
   * @see nsIMutationObserver::ContentInserted
   */
  static void ContentInserted(nsINode* aContainer, nsIContent* aChild);
  /**
   * Send ContentRemoved notifications to nsIMutationObservers
   * @param aContainer        Node from which child was removed
   * @param aChild            Removed child
   * @param aPreviousSibling  Previous sibling of the removed child
   * @see nsIMutationObserver::ContentRemoved
   */
  static void ContentRemoved(nsINode* aContainer, nsIContent* aChild,
                             nsIContent* aPreviousSibling);
  /**
   * Send ParentChainChanged notifications to nsIMutationObservers
   * @param aContent  The piece of content that had its parent changed.
   * @see nsIMutationObserver::ParentChainChanged
   */
  static inline void ParentChainChanged(nsIContent* aContent) {
    nsINode::nsSlots* slots = aContent->GetExistingSlots();
    if (slots && !slots->mMutationObservers.IsEmpty()) {
      NS_OBSERVER_AUTO_ARRAY_NOTIFY_OBSERVERS(slots->mMutationObservers,
                                              nsIMutationObserver, 1,
                                              ParentChainChanged, (aContent));
    }
  }

  /**
   * Utility function to get the target (pseudo-)element associated with an
   * animation.
   * @param aAnimation The animation whose target is what we want.
   */
  static mozilla::Maybe<mozilla::NonOwningAnimationTarget>
  GetTargetForAnimation(const mozilla::dom::Animation* aAnimation);

  /**
   * Notify that an animation is added/changed/removed.
   * @param aAnimation The animation we added/changed/removed.
   */
  static void AnimationAdded(mozilla::dom::Animation* aAnimation);
  static void AnimationChanged(mozilla::dom::Animation* aAnimation);
  static void AnimationRemoved(mozilla::dom::Animation* aAnimation);

  /**
   * To be called when reference count of aNode drops to zero.
   * @param aNode The node which is going to be deleted.
   */
  static void LastRelease(nsINode* aNode);

  /**
   * Clones aNode, its attributes and, if aDeep is true, its descendant nodes
   * If aNewNodeInfoManager is not null, it is used to create new nodeinfos for
   * the clones. aNodesWithProperties will be filled with all the nodes that
   * have properties, and every node in it will be followed by its clone.
   *
   * @param aNode Node to clone.
   * @param aDeep If true the function will be called recursively on
   *              descendants of the node
   * @param aNewNodeInfoManager The nodeinfo manager to use to create new
   *                            nodeinfos for aNode and its attributes and
   *                            descendants. May be null if the nodeinfos
   *                            shouldn't be changed.
   * @param aNodesWithProperties All nodes (from amongst aNode and its
   *                             descendants) with properties. Every node will
   *                             be followed by its clone. Null can be passed to
   *                             prevent this from being used.
   * @param aError The error, if any.
   *
   * @return The newly created node.  Null in error conditions.
   */
  static already_AddRefed<nsINode> Clone(
      nsINode* aNode, bool aDeep, nsNodeInfoManager* aNewNodeInfoManager,
      nsCOMArray<nsINode>* aNodesWithProperties, mozilla::ErrorResult& aError) {
    return CloneAndAdopt(aNode, true, aDeep, aNewNodeInfoManager, nullptr,
                         aNodesWithProperties, nullptr, aError);
  }

  /**
   * Walks aNode, its attributes and descendant nodes. If aNewNodeInfoManager is
   * not null, it is used to create new nodeinfos for the nodes. Also reparents
   * the XPConnect wrappers for the nodes into aReparentScope if non-null.
   * aNodesWithProperties will be filled with all the nodes that have
   * properties.
   *
   * @param aNode Node to adopt.
   * @param aNewNodeInfoManager The nodeinfo manager to use to create new
   *                            nodeinfos for aNode and its attributes and
   *                            descendants. May be null if the nodeinfos
   *                            shouldn't be changed.
   * @param aReparentScope New scope for the wrappers, or null if no reparenting
   *                       should be done.
   * @param aNodesWithProperties All nodes (from amongst aNode and its
   *                             descendants) with properties.
   * @param aError The error, if any.
   */
  static void Adopt(nsINode* aNode, nsNodeInfoManager* aNewNodeInfoManager,
                    JS::Handle<JSObject*> aReparentScope,
                    nsCOMArray<nsINode>& aNodesWithProperties,
                    mozilla::ErrorResult& aError) {
    // Just need to store the return value of CloneAndAdopt in a
    // temporary nsCOMPtr to make sure we release it.
    nsCOMPtr<nsINode> node =
        CloneAndAdopt(aNode, false, true, aNewNodeInfoManager, aReparentScope,
                      &aNodesWithProperties, nullptr, aError);

    nsMutationGuard::DidMutate();
  }

  /**
   * A basic implementation of the DOM cloneNode method. Calls nsINode::Clone to
   * do the actual cloning of the node.
   *
   * @param aNode the node to clone
   * @param aDeep if true all descendants will be cloned too
   * @param aError the error, if any.
   *
   * @return the clone, or null if an error occurs.
   */
  static already_AddRefed<nsINode> CloneNodeImpl(nsINode* aNode, bool aDeep,
                                                 mozilla::ErrorResult& aError);

  /**
   * Returns a true if the node is a HTMLTemplate element.
   *
   * @param aNode a node to test for HTMLTemplate elementness.
   */
  static bool IsTemplateElement(const nsINode* aNode);

  /**
   * Returns the first child of a node or the first child of
   * a template element's content if the provided node is a
   * template element.
   *
   * @param aNode A node from which to retrieve the first child.
   */
  static nsIContent* GetFirstChildOfTemplateOrNode(nsINode* aNode);

 private:
  /**
   * Walks aNode, its attributes and, if aDeep is true, its descendant nodes.
   * If aClone is true the nodes will be cloned. If aNewNodeInfoManager is
   * not null, it is used to create new nodeinfos for the nodes. Also reparents
   * the XPConnect wrappers for the nodes into aReparentScope if non-null.
   * aNodesWithProperties will be filled with all the nodes that have
   * properties.
   *
   * @param aNode Node to adopt/clone.
   * @param aClone If true the node will be cloned and the cloned node will
   *               be returned.
   * @param aDeep If true the function will be called recursively on
   *              descendants of the node
   * @param aNewNodeInfoManager The nodeinfo manager to use to create new
   *                            nodeinfos for aNode and its attributes and
   *                            descendants. May be null if the nodeinfos
   *                            shouldn't be changed.
   * @param aReparentScope Scope into which wrappers should be reparented, or
   *                             null if no reparenting should be done.
   * @param aNodesWithProperties All nodes (from amongst aNode and its
   *                             descendants) with properties. If aClone is
   *                             true every node will be followed by its
   *                             clone. Null can be passed to prevent this from
   *                             being populated.
   * @param aParent If aClone is true the cloned node will be appended to
   *                aParent's children. May be null. If not null then aNode
   *                must be an nsIContent.
   * @param aError The error, if any.
   *
   * @return If aClone is true then the cloned node will be returned,
   *          unless an error occurred.  In error conditions, null
   *          will be returned.
   */
  static already_AddRefed<nsINode> CloneAndAdopt(
      nsINode* aNode, bool aClone, bool aDeep,
      nsNodeInfoManager* aNewNodeInfoManager,
      JS::Handle<JSObject*> aReparentScope,
      nsCOMArray<nsINode>* aNodesWithProperties, nsINode* aParent,
      mozilla::ErrorResult& aError);

  enum class AnimationMutationType { Added, Changed, Removed };
  /**
   * Notify the observers of the target of an animation
   * @param aAnimation The mutated animation.
   * @param aMutationType The mutation type of this animation. It could be
   *                      Added, Changed, or Removed.
   */
  static void AnimationMutated(mozilla::dom::Animation* aAnimation,
                               AnimationMutationType aMutatedType);
};

#endif  // nsNodeUtils_h___