Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 432 insertions, 0 deletions

diff --git a/dom/base/nsIMutationObserver.h b/dom/base/nsIMutationObserver.h
new file mode 100644
index 0000000000..71abf05925
--- /dev/null
+++ b/dom/base/nsIMutationObserver.h
@@ -0,0 +1,432 @@
+/* -*- 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 nsIMutationObserver_h
+#define nsIMutationObserver_h
+
+#include "nsISupports.h"
+
+#include "mozilla/Assertions.h"
+#include "mozilla/DoublyLinkedList.h"
+
+class nsAttrValue;
+class nsAtom;
+class nsIContent;
+class nsINode;
+
+namespace mozilla::dom {
+class Element;
+}  // namespace mozilla::dom
+
+#define NS_IMUTATION_OBSERVER_IID                    \
+  {                                                  \
+    0x6d674c17, 0x0fbc, 0x4633, {                    \
+      0x8f, 0x46, 0x73, 0x4e, 0x87, 0xeb, 0xf0, 0xc7 \
+    }                                                \
+  }
+
+/**
+ * Information details about a characterdata change.  Basically, we
+ * view all changes as replacements of a length of text at some offset
+ * with some other text (of possibly some other length).
+ */
+struct CharacterDataChangeInfo {
+  /**
+   * True if this character data change is just an append.
+   */
+  bool mAppend;
+
+  /**
+   * The offset in the text where the change occurred.
+   */
+  uint32_t mChangeStart;
+
+  /**
+   * The offset such that mChangeEnd - mChangeStart is equal to the length of
+   * the text we removed. If this was a pure insert, append or a result of
+   * `splitText()` this is equal to mChangeStart.
+   */
+  uint32_t mChangeEnd;
+
+  uint32_t LengthOfRemovedText() const {
+    MOZ_ASSERT(mChangeStart <= mChangeEnd);
+
+    return mChangeEnd - mChangeStart;
+  }
+
+  /**
+   * The length of the text that was inserted in place of the removed text.  If
+   * this was a pure text removal, this is 0.
+   */
+  uint32_t mReplaceLength;
+
+  /**
+   * The net result is that mChangeStart characters at the beginning of the
+   * text remained as they were.  The next mChangeEnd - mChangeStart characters
+   * were removed, and mReplaceLength characters were inserted in their place.
+   * The text that used to begin at mChangeEnd now begins at
+   * mChangeStart + mReplaceLength.
+   */
+
+  struct MOZ_STACK_CLASS Details {
+    enum {
+      eMerge,  // two text nodes are merged as a result of normalize()
+      eSplit   // a text node is split as a result of splitText()
+    } mType;
+    /**
+     * For eMerge it's the text node that will be removed, for eSplit it's the
+     * new text node.
+     */
+    nsIContent* MOZ_NON_OWNING_REF mNextSibling;
+  };
+
+  /**
+   * Used for splitText() and normalize(), otherwise null.
+   */
+  Details* mDetails;
+};
+
+/**
+ * Mutation observer interface
+ *
+ * See nsINode::AddMutationObserver, nsINode::RemoveMutationObserver for how to
+ * attach or remove your observers. nsINode stores mutation observers using a
+ * mozilla::SafeDoublyLinkedList, which is a specialization of the
+ * DoublyLinkedList allowing for adding/removing elements while iterating.
+ * If a mutation observer is intended to be added to multiple nsINode instances,
+ * derive from nsMultiMutationObserver.
+ *
+ * WARNING: During these notifications, you are not allowed to perform
+ * any mutations to the current or any other document, or start a
+ * network load.  If you need to perform such operations do that
+ * during the _last_ nsIDocumentObserver::EndUpdate notification.  The
+ * exception for this is ParentChainChanged, where mutations should be
+ * done from an async event, as the notification might not be
+ * surrounded by BeginUpdate/EndUpdate calls.
+ */
+class nsIMutationObserver
+    : public nsISupports,
+      mozilla::DoublyLinkedListElement<nsIMutationObserver> {
+  friend struct mozilla::GetDoublyLinkedListElement<nsIMutationObserver>;
+
+ public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_IMUTATION_OBSERVER_IID)
+
+  /**
+   * Notification that the node value of a data node (text, cdata, pi, comment)
+   * will be changed.
+   *
+   * This notification is not sent when a piece of content is
+   * added/removed from the document (the other notifications are used
+   * for that).
+   *
+   * @param aContent  The piece of content that changed. Is never null.
+   * @param aInfo     The structure with information details about the change.
+   *
+   * @note Callers of this method might not hold a strong reference to the
+   *       observer.  The observer is responsible for making sure it stays
+   *       alive for the duration of the call as needed.  The observer may
+   *       assume that this call will happen when there are script blockers on
+   *       the stack.
+   */
+  virtual void CharacterDataWillChange(nsIContent* aContent,
+                                       const CharacterDataChangeInfo&) = 0;
+
+  /**
+   * Notification that the node value of a data node (text, cdata, pi, comment)
+   * has changed.
+   *
+   * This notification is not sent when a piece of content is
+   * added/removed from the document (the other notifications are used
+   * for that).
+   *
+   * @param aContent  The piece of content that changed. Is never null.
+   * @param aInfo     The structure with information details about the change.
+   *
+   * @note Callers of this method might not hold a strong reference to the
+   *       observer.  The observer is responsible for making sure it stays
+   *       alive for the duration of the call as needed.  The observer may
+   *       assume that this call will happen when there are script blockers on
+   *       the stack.
+   */
+  virtual void CharacterDataChanged(nsIContent* aContent,
+                                    const CharacterDataChangeInfo&) = 0;
+
+  /**
+   * Notification that an attribute of an element will change.  This
+   * can happen before the BeginUpdate for the change and may not
+   * always be followed by an AttributeChanged (in particular, if the
+   * attribute doesn't actually change there will be no corresponding
+   * AttributeChanged).
+   *
+   * @param aContent     The element whose attribute will change
+   * @param aNameSpaceID The namespace id of the changing attribute
+   * @param aAttribute   The name of the changing attribute
+   * @param aModType     Whether or not the attribute will be added, changed, or
+   *                     removed. The constants are defined in
+   *                     MutationEvent.webidl.
+   *
+   * @note Callers of this method might not hold a strong reference to the
+   *       observer.  The observer is responsible for making sure it stays
+   *       alive for the duration of the call as needed.  The observer may
+   *       assume that this call will happen when there are script blockers on
+   *       the stack.
+   */
+  virtual void AttributeWillChange(mozilla::dom::Element* aElement,
+                                   int32_t aNameSpaceID, nsAtom* aAttribute,
+                                   int32_t aModType) = 0;
+
+  /**
+   * Notification that an attribute of an element has changed.
+   *
+   * @param aElement     The element whose attribute changed
+   * @param aNameSpaceID The namespace id of the changed attribute
+   * @param aAttribute   The name of the changed attribute
+   * @param aModType     Whether or not the attribute was added, changed, or
+   *                     removed. The constants are defined in
+   *                     MutationEvent.webidl.
+   * @param aOldValue    The old value, if either the old value or the new
+   *                     value are StoresOwnData() (or absent); null otherwise.
+   *
+   * @note Callers of this method might not hold a strong reference to the
+   *       observer.  The observer is responsible for making sure it stays
+   *       alive for the duration of the call as needed.  The observer may
+   *       assume that this call will happen when there are script blockers on
+   *       the stack.
+   */
+  virtual void AttributeChanged(mozilla::dom::Element* aElement,
+                                int32_t aNameSpaceID, nsAtom* aAttribute,
+                                int32_t aModType,
+                                const nsAttrValue* aOldValue) = 0;
+
+  /**
+   * Notification that an attribute of an element has been
+   * set to the value it already had.
+   *
+   * @param aElement     The element whose attribute changed
+   * @param aNameSpaceID The namespace id of the changed attribute
+   * @param aAttribute   The name of the changed attribute
+   */
+  virtual void AttributeSetToCurrentValue(mozilla::dom::Element* aElement,
+                                          int32_t aNameSpaceID,
+                                          nsAtom* aAttribute) {}
+
+  /**
+   * Notification that one or more content nodes have been appended to the
+   * child list of another node in the tree.
+   *
+   * @param aFirstNewContent the first node appended.
+   *
+   * @note Callers of this method might not hold a strong reference to the
+   *       observer.  The observer is responsible for making sure it stays
+   *       alive for the duration of the call as needed.  The observer may
+   *       assume that this call will happen when there are script blockers on
+   *       the stack.
+   */
+  virtual void ContentAppended(nsIContent* aFirstNewContent) = 0;
+
+  /**
+   * Notification that a content node has been inserted as child to another
+   * node in the tree.
+   *
+   * @param aChild The newly inserted child.
+   *
+   * @note Callers of this method might not hold a strong reference to the
+   *       observer.  The observer is responsible for making sure it stays
+   *       alive for the duration of the call as needed.  The observer may
+   *       assume that this call will happen when there are script blockers on
+   *       the stack.
+   */
+  virtual void ContentInserted(nsIContent* aChild) = 0;
+
+  /**
+   * Notification that a content node has been removed from the child list of
+   * another node in the tree.
+   *
+   * @param aChild     The child that was removed.
+   * @param aPreviousSibling The previous sibling to the child that was removed.
+   *                         Can be null if there was no previous sibling.
+   *
+   * @note Callers of this method might not hold a strong reference to the
+   *       observer.  The observer is responsible for making sure it stays
+   *       alive for the duration of the call as needed.  The observer may
+   *       assume that this call will happen when there are script blockers on
+   *       the stack.
+   */
+  virtual void ContentRemoved(nsIContent* aChild,
+                              nsIContent* aPreviousSibling) = 0;
+
+  /**
+   * The node is in the process of being destroyed. Calling QI on the node is
+   * not supported, however it is possible to get children and flags through
+   * nsINode as well as calling IsContent and casting to nsIContent to get
+   * attributes.
+   *
+   * NOTE: This notification is only called on observers registered directly
+   * on the node. This is because when the node is destroyed it can not have
+   * any ancestors. If you want to know when a descendant node is being
+   * removed from the observed node, use the ContentRemoved notification.
+   *
+   * @param aNode The node being destroyed.
+   *
+   * @note Callers of this method might not hold a strong reference to
+   *       the observer.  The observer is responsible for making sure it
+   *       stays alive for the duration of the call as needed.
+   */
+  virtual void NodeWillBeDestroyed(nsINode* aNode) = 0;
+
+  /**
+   * Notification that the node's parent chain has changed. This
+   * happens when either the node or one of its ancestors is inserted
+   * or removed as a child of another node.
+   *
+   * Note that when a node is inserted this notification is sent to
+   * all descendants of that node, since all such nodes have their
+   * parent chain changed.
+   *
+   * @param aContent  The piece of content that had its parent changed.
+   *
+   * @note Callers of this method might not hold a strong reference to
+   *       the observer.  The observer is responsible for making sure it
+   *       stays alive for the duration of the call as needed.
+   */
+
+  virtual void ParentChainChanged(nsIContent* aContent) = 0;
+
+  virtual void ARIAAttributeDefaultWillChange(mozilla::dom::Element* aElement,
+                                              nsAtom* aAttribute,
+                                              int32_t aModType) = 0;
+  virtual void ARIAAttributeDefaultChanged(mozilla::dom::Element* aElement,
+                                           nsAtom* aAttribute,
+                                           int32_t aModType) = 0;
+
+  enum : uint32_t {
+    kNone = 0,
+    kCharacterDataWillChange = 1 << 0,
+    kCharacterDataChanged = 1 << 1,
+    kAttributeWillChange = 1 << 2,
+    kAttributeChanged = 1 << 3,
+    kAttributeSetToCurrentValue = 1 << 4,
+    kContentAppended = 1 << 5,
+    kContentInserted = 1 << 6,
+    kContentRemoved = 1 << 7,
+    kNodeWillBeDestroyed = 1 << 8,
+    kParentChainChanged = 1 << 9,
+    kARIAAttributeDefaultWillChange = 1 << 10,
+    kARIAAttributeDefaultChanged = 1 << 11,
+
+    kBeginUpdate = 1 << 12,
+    kEndUpdate = 1 << 13,
+    kBeginLoad = 1 << 14,
+    kEndLoad = 1 << 15,
+    kElementStateChanged = 1 << 16,
+
+    kAnimationAdded = 1 << 17,
+    kAnimationChanged = 1 << 18,
+    kAnimationRemoved = 1 << 19,
+
+    kAll = 0xFFFFFFFF
+  };
+
+  void SetEnabledCallbacks(uint32_t aCallbacks) {
+    mEnabledCallbacks = aCallbacks;
+  }
+
+  bool IsCallbackEnabled(uint32_t aCallback) const {
+    return mEnabledCallbacks & aCallback;
+  }
+
+ private:
+  uint32_t mEnabledCallbacks = kAll;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIMutationObserver, NS_IMUTATION_OBSERVER_IID)
+
+#define NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATAWILLCHANGE \
+  virtual void CharacterDataWillChange(                     \
+      nsIContent* aContent, const CharacterDataChangeInfo& aInfo) override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED \
+  virtual void CharacterDataChanged(                     \
+      nsIContent* aContent, const CharacterDataChangeInfo& aInfo) override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE                      \
+  virtual void AttributeWillChange(mozilla::dom::Element* aElement,          \
+                                   int32_t aNameSpaceID, nsAtom* aAttribute, \
+                                   int32_t aModType) override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED                      \
+  virtual void AttributeChanged(mozilla::dom::Element* aElement,          \
+                                int32_t aNameSpaceID, nsAtom* aAttribute, \
+                                int32_t aModType,                         \
+                                const nsAttrValue* aOldValue) override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED \
+  virtual void ContentAppended(nsIContent* aFirstNewContent) override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED \
+  virtual void ContentInserted(nsIContent* aChild) override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED \
+  virtual void ContentRemoved(nsIContent* aChild,  \
+                              nsIContent* aPreviousSibling) override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED \
+  virtual void NodeWillBeDestroyed(nsINode* aNode) override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED \
+  virtual void ParentChainChanged(nsIContent* aContent) override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER_ARIAATTRIBUTEDEFAULTWILLCHANGE           \
+  virtual void ARIAAttributeDefaultWillChange(                               \
+      mozilla::dom::Element* aElement, nsAtom* aAttribute, int32_t aModType) \
+      override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER_ARIAATTRIBUTEDEFAULTCHANGED              \
+  virtual void ARIAAttributeDefaultChanged(                                  \
+      mozilla::dom::Element* aElement, nsAtom* aAttribute, int32_t aModType) \
+      override;
+
+#define NS_DECL_NSIMUTATIONOBSERVER                          \
+  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATAWILLCHANGE        \
+  NS_DECL_NSIMUTATIONOBSERVER_CHARACTERDATACHANGED           \
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTEWILLCHANGE            \
+  NS_DECL_NSIMUTATIONOBSERVER_ATTRIBUTECHANGED               \
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTAPPENDED                \
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTINSERTED                \
+  NS_DECL_NSIMUTATIONOBSERVER_CONTENTREMOVED                 \
+  NS_DECL_NSIMUTATIONOBSERVER_NODEWILLBEDESTROYED            \
+  NS_DECL_NSIMUTATIONOBSERVER_PARENTCHAINCHANGED             \
+  NS_DECL_NSIMUTATIONOBSERVER_ARIAATTRIBUTEDEFAULTWILLCHANGE \
+  NS_DECL_NSIMUTATIONOBSERVER_ARIAATTRIBUTEDEFAULTCHANGED
+
+#define NS_IMPL_NSIMUTATIONOBSERVER_CORE_STUB(_class) \
+  void _class::NodeWillBeDestroyed(nsINode* aNode) {}
+
+#define NS_IMPL_NSIMUTATIONOBSERVER_CONTENT(_class)                            \
+  void _class::CharacterDataWillChange(                                        \
+      nsIContent* aContent, const CharacterDataChangeInfo& aInfo) {}           \
+  void _class::CharacterDataChanged(nsIContent* aContent,                      \
+                                    const CharacterDataChangeInfo& aInfo) {}   \
+  void _class::AttributeWillChange(mozilla::dom::Element* aElement,            \
+                                   int32_t aNameSpaceID, nsAtom* aAttribute,   \
+                                   int32_t aModType) {}                        \
+  void _class::AttributeChanged(                                               \
+      mozilla::dom::Element* aElement, int32_t aNameSpaceID,                   \
+      nsAtom* aAttribute, int32_t aModType, const nsAttrValue* aOldValue) {}   \
+  void _class::ContentAppended(nsIContent* aFirstNewContent) {}                \
+  void _class::ContentInserted(nsIContent* aChild) {}                          \
+  void _class::ContentRemoved(nsIContent* aChild,                              \
+                              nsIContent* aPreviousSibling) {}                 \
+  void _class::ParentChainChanged(nsIContent* aContent) {}                     \
+  void _class::ARIAAttributeDefaultWillChange(                                 \
+      mozilla::dom::Element* aElement, nsAtom* aAttribute, int32_t aModType) { \
+  }                                                                            \
+  void _class::ARIAAttributeDefaultChanged(                                    \
+      mozilla::dom::Element* aElement, nsAtom* aAttribute, int32_t aModType) { \
+  }
+
+#endif /* nsIMutationObserver_h */