diff -r 000000000000 -r 6474c204b198 content/base/public/nsXMLNameSpaceMap.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/public/nsXMLNameSpaceMap.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,74 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 nsXMLNameSpaceMap_h_
+#define nsXMLNameSpaceMap_h_
+
+#include "nsString.h"
+#include "nsTArray.h"
+#include "nsCOMPtr.h"
+#include "nsIAtom.h"
+
+struct nsNameSpaceEntry
+{
+  nsNameSpaceEntry(nsIAtom *aPrefix)
+    : prefix(aPrefix) {}
+
+  nsCOMPtr<nsIAtom> prefix;
+  int32_t nameSpaceID;
+};
+
+/**
+ * nsXMLNameSpaceMap contains a set of prefixes which are mapped onto
+ * namespaces.  It allows the set to be searched by prefix or by namespace ID.
+ */
+class nsXMLNameSpaceMap
+{
+public:
+  /**
+   * Allocates a new nsXMLNameSpaceMap (with new()) and if aForXML is
+   * true initializes it with the xmlns and xml namespaces.
+   */
+  static NS_HIDDEN_(nsXMLNameSpaceMap*) Create(bool aForXML);
+
+  /**
+   * Add a prefix and its corresponding namespace ID to the map.
+   * Passing a null |aPrefix| corresponds to the default namespace, which may
+   * be set to something other than kNameSpaceID_None.
+   */
+  NS_HIDDEN_(nsresult) AddPrefix(nsIAtom *aPrefix, int32_t aNameSpaceID);
+
+  /**
+   * Add a prefix and a namespace URI to the map.  The URI will be converted
+   * to its corresponding namespace ID.
+   */
+  NS_HIDDEN_(nsresult) AddPrefix(nsIAtom *aPrefix, nsString &aURI);
+
+  /*
+   * Returns the namespace ID for the given prefix, if it is in the map.
+   * If |aPrefix| is null and is not in the map, then a null namespace
+   * (kNameSpaceID_None) is returned.  If |aPrefix| is non-null and is not in
+   * the map, then kNameSpaceID_Unknown is returned.
+   */
+  NS_HIDDEN_(int32_t) FindNameSpaceID(nsIAtom *aPrefix) const;
+
+  /**
+   * If the given namespace ID is in the map, then the first prefix which
+   * maps to that namespace is returned.  Otherwise, null is returned.
+   */
+  NS_HIDDEN_(nsIAtom*) FindPrefix(int32_t aNameSpaceID) const;
+
+  /* Removes all prefix mappings. */
+  NS_HIDDEN_(void) Clear();
+
+  ~nsXMLNameSpaceMap() { Clear(); }
+
+private:
+  nsXMLNameSpaceMap() NS_HIDDEN;  // use Create() to create new instances
+
+  nsTArray<nsNameSpaceEntry> mNameSpaces;
+};
+
+#endif