1 files changed, 61 insertions, 0 deletions
diff --git a/dom/base/nsContentListDeclarations.h b/dom/base/nsContentListDeclarations.h
new file mode 100644
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+++ b/dom/base/nsContentListDeclarations.h
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+/* -*- 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 nsContentListDeclarations_h
+#define nsContentListDeclarations_h
+
+#include <stdint.h>
+#include "nsCOMPtr.h"
+#include "nsStringFwd.h"
+
+class nsContentList;
+class nsAtom;
+class nsIContent;
+class nsINode;
+
+namespace mozilla::dom {
+class Element;
+}  // namespace mozilla::dom
+
+// Magic namespace id that means "match all namespaces".  This is
+// negative so it won't collide with actual namespace constants.
+#define kNameSpaceID_Wildcard INT32_MIN
+
+// This is a callback function type that can be used to implement an
+// arbitrary matching algorithm.  aContent is the content that may
+// match the list, while aNamespaceID, aAtom, and aData are whatever
+// was passed to the list's constructor.
+using nsContentListMatchFunc = bool (*)(mozilla::dom::Element* aElement,
+                                        int32_t aNamespaceID, nsAtom* aAtom,
+                                        void* aData);
+
+using nsContentListDestroyFunc = void (*)(void* aData);
+
+/**
+ * A function that allocates the matching data for this
+ * FuncStringContentList.  Returning aString is perfectly fine; in
+ * that case the destructor function should be a no-op.
+ */
+using nsFuncStringContentListDataAllocator = void* (*)(nsINode* aRootNode,
+                                                       const nsString* aString);
+
+// If aMatchNameSpaceId is kNameSpaceID_Unknown, this will return a
+// content list which matches ASCIIToLower(aTagname) against HTML
+// elements in HTML documents and aTagname against everything else.
+// For any other value of aMatchNameSpaceId, the list will match
+// aTagname against all elements.
+already_AddRefed<nsContentList> NS_GetContentList(nsINode* aRootNode,
+                                                  int32_t aMatchNameSpaceId,
+                                                  const nsAString& aTagname);
+
+template <class ListType>
+already_AddRefed<nsContentList> GetFuncStringContentList(
+    nsINode* aRootNode, nsContentListMatchFunc aFunc,
+    nsContentListDestroyFunc aDestroyFunc,
+    nsFuncStringContentListDataAllocator aDataAllocator,
+    const nsAString& aString);
+
+#endif  // nsContentListDeclarations_h