Adding upstream version 115.7.0esr.upstream/115.7.0esrupstream

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

1 files changed, 166 insertions, 0 deletions

diff --git a/dom/base/nsPropertyTable.h b/dom/base/nsPropertyTable.h
new file mode 100644
index 0000000000..7fb90f6b9f
--- /dev/null
+++ b/dom/base/nsPropertyTable.h
@@ -0,0 +1,166 @@
+/* -*- 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/. */
+
+/**
+ * nsPropertyTable allows a set of arbitrary key/value pairs to be stored
+ * for any number of nodes, in a global hashtable rather than on the nodes
+ * themselves.  Nodes can be any type of object; the hashtable keys are
+ * nsAtom pointers, and the values are void pointers.
+ */
+
+#ifndef nsPropertyTable_h_
+#define nsPropertyTable_h_
+
+#include "mozilla/MemoryReporting.h"
+#include "nscore.h"
+
+class nsAtom;
+
+using NSPropertyFunc = void (*)(void* aObject, nsAtom* aPropertyName,
+                                void* aPropertyValue, void* aData);
+
+/**
+ * Callback type for property destructors.  |aObject| is the object
+ * the property is being removed for, |aPropertyName| is the property
+ * being removed, |aPropertyValue| is the value of the property, and |aData|
+ * is the opaque destructor data that was passed to SetProperty().
+ **/
+using NSPropertyDtorFunc = NSPropertyFunc;
+class nsINode;
+class nsIFrame;
+
+class nsPropertyOwner {
+ public:
+  nsPropertyOwner(const nsPropertyOwner& aOther) = default;
+
+  // These are the types of objects that can own properties. No object should
+  // inherit more then one of these classes.
+  // To add support for more types just add to this list.
+  MOZ_IMPLICIT nsPropertyOwner(const nsINode* aObject) : mObject(aObject) {}
+  MOZ_IMPLICIT nsPropertyOwner(const nsIFrame* aObject) : mObject(aObject) {}
+
+  operator const void*() { return mObject; }
+  const void* get() { return mObject; }
+
+ private:
+  const void* mObject;
+};
+
+class nsPropertyTable {
+ public:
+  /**
+   * Get the value of the property |aPropertyName| for node |aObject|.
+   * |aResult|, if supplied, is filled in with a return status code.
+   **/
+  void* GetProperty(const nsPropertyOwner& aObject, const nsAtom* aPropertyName,
+                    nsresult* aResult = nullptr) {
+    return GetPropertyInternal(aObject, aPropertyName, false, aResult);
+  }
+
+  /**
+   * Set the value of the property |aPropertyName| to
+   * |aPropertyValue| for node |aObject|.  |aDtor| is a destructor for the
+   * property value to be called if the property is removed.  It can be null
+   * if no destructor is required.  |aDtorData| is an optional pointer to an
+   * opaque context to be passed to the property destructor.  Note that the
+   * destructor is global for each property name regardless of node; it is an
+   * error to set a given property with a different destructor than was used
+   * before (this will return NS_ERROR_INVALID_ARG). If |aTransfer| is true
+   * the property will be transfered to the new table when the property table
+   * for |aObject| changes (currently the tables for nodes are owned by their
+   * ownerDocument, so if the ownerDocument for a node changes, its property
+   * table changes too). If |aTransfer| is false the property will just be
+   * deleted instead.
+   */
+  nsresult SetProperty(const nsPropertyOwner& aObject, nsAtom* aPropertyName,
+                       void* aPropertyValue, NSPropertyDtorFunc aDtor,
+                       void* aDtorData, bool aTransfer = false) {
+    return SetPropertyInternal(aObject, aPropertyName, aPropertyValue, aDtor,
+                               aDtorData, aTransfer);
+  }
+
+  /**
+   * Remove the property |aPropertyName| in the global category for object
+   * |aObject|. The property's destructor function will be called.
+   */
+  nsresult RemoveProperty(nsPropertyOwner aObject, const nsAtom* aPropertyName);
+
+  /**
+   * Remove the property |aPropertyName| in the global category for object
+   * |aObject|, but do not call the property's destructor function.  The
+   * property value is returned.
+   */
+  void* TakeProperty(const nsPropertyOwner& aObject,
+                     const nsAtom* aPropertyName, nsresult* aStatus = nullptr) {
+    return GetPropertyInternal(aObject, aPropertyName, true, aStatus);
+  }
+
+  /**
+   * Removes all of the properties for object |aObject|, calling the destructor
+   * function for each property.
+   */
+  void RemoveAllPropertiesFor(nsPropertyOwner aObject);
+
+  /**
+   * Transfers all properties for object |aObject| that were set with the
+   * |aTransfer| argument as true to |aTable|. Removes the other properties for
+   * object |aObject|, calling the destructor function for each property.
+   * If transfering a property fails, this deletes all the properties for object
+   * |aObject|.
+   */
+  nsresult TransferOrRemoveAllPropertiesFor(nsPropertyOwner aObject,
+                                            nsPropertyTable& aOtherTable);
+
+  /**
+   * Enumerate the properties for object |aObject|.
+   * For every property |aCallback| will be called with as arguments |aObject|,
+   * the property name, the property value and |aData|.
+   */
+  void Enumerate(nsPropertyOwner aObject, NSPropertyFunc aCallback,
+                 void* aData);
+
+  /**
+   * Enumerate all the properties.
+   * For every property |aCallback| will be called with arguments the owner,
+   * the property name, the property value and |aData|.
+   */
+  void EnumerateAll(NSPropertyFunc aCallback, void* aData);
+
+  /**
+   * Removes all of the properties for all objects in the property table,
+   * calling the destructor function for each property.
+   */
+  void RemoveAllProperties();
+
+  nsPropertyTable() : mPropertyList(nullptr) {}
+  ~nsPropertyTable() { RemoveAllProperties(); }
+
+  /**
+   * Function useable as destructor function for property data that is
+   * XPCOM objects. The function will call NS_IF_RELASE on the value
+   * to destroy it.
+   */
+  static void SupportsDtorFunc(void* aObject, nsAtom* aPropertyName,
+                               void* aPropertyValue, void* aData);
+
+  class PropertyList;
+
+  size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+ private:
+  void DestroyPropertyList();
+  PropertyList* GetPropertyListFor(const nsAtom* aPropertyName) const;
+  void* GetPropertyInternal(nsPropertyOwner aObject,
+                            const nsAtom* aPropertyName, bool aRemove,
+                            nsresult* aStatus);
+  nsresult SetPropertyInternal(nsPropertyOwner aObject, nsAtom* aPropertyName,
+                               void* aPropertyValue, NSPropertyDtorFunc aDtor,
+                               void* aDtorData, bool aTransfer);
+
+  PropertyList* mPropertyList;
+};
+#endif