1 files changed, 104 insertions, 0 deletions
diff --git a/svx/source/inc/treevisitor.hxx b/svx/source/inc/treevisitor.hxx
new file mode 100644
index 000000000..50e7d7a35
--- /dev/null
+++ b/svx/source/inc/treevisitor.hxx
@@ -0,0 +1,104 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SVX_SOURCE_INC_TREEVISITOR_HXX
+#define INCLUDED_SVX_SOURCE_INC_TREEVISITOR_HXX
+
+#include <stack>
+
+template< class ELEMENT, class NODEINFO, class PROCESSOR >
+class TreeVisitor
+{
+public:
+    TreeVisitor( NODEINFO _nodeInfo )
+        :m_visitedRoot( false )
+        ,m_root()
+        ,m_current()
+        ,m_nodeInfo( _nodeInfo )
+    {
+    }
+
+    void    process( const ELEMENT& _root, PROCESSOR& _processor )
+    {
+        m_root = _root;
+        m_visitedRoot = false;
+
+        while ( do_step() )
+            _processor.process( m_current );
+    }
+
+private:
+    bool    do_step();
+
+private:
+    bool            m_visitedRoot;
+    ELEMENT         m_root;
+    ELEMENT         m_current;
+    const NODEINFO  m_nodeInfo;
+
+    ::std::stack< size_t >  m_pathToCurrent;
+    ::std::stack< ELEMENT > m_currentAncestors;
+};
+
+template< class ELEMENT, class NODEINFO, class PROCESSOR >
+bool TreeVisitor< ELEMENT, NODEINFO, PROCESSOR >::do_step()
+{
+    if ( !m_visitedRoot )
+    {
+        m_current = m_root;
+        m_visitedRoot = true;
+        return true;
+    }
+
+    // can we step down from the current node?
+    size_t childCount = m_nodeInfo.childCount( m_current );
+    if ( childCount )
+    {
+        m_currentAncestors.push( m_current );
+        m_current = m_nodeInfo.getChild( m_current, 0 );
+        m_pathToCurrent.push( 0 );
+        return true;
+    }
+
+    // is there a right sibling of the current node?
+    while ( !m_pathToCurrent.empty() )
+    {
+        const ELEMENT& currentParent = m_currentAncestors.top();
+        childCount = m_nodeInfo.childCount( currentParent );
+
+        size_t currentChildPos = m_pathToCurrent.top();
+        if ( ++currentChildPos < childCount )
+        {
+            // yes there is
+            m_pathToCurrent.top() = currentChildPos;
+            m_current = m_nodeInfo.getChild( currentParent, currentChildPos );
+            return true;
+        }
+
+        // no there isn't => step up
+        m_currentAncestors.pop();
+        m_pathToCurrent.pop();
+    }
+
+    return false;
+}
+
+#endif // INCLUDED_SVX_SOURCE_INC_TREEVISITOR_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */