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diff --git a/tools/quickbook/src/utils.hpp b/tools/quickbook/src/utils.hpp
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+++ b/tools/quickbook/src/utils.hpp
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+/*=============================================================================
+    Copyright (c) 2002 2004 2006 Joel de Guzman
+    Copyright (c) 2004 Eric Niebler
+    http://spirit.sourceforge.net/
+
+    Use, modification and distribution is subject to the Boost Software
+    License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+    http://www.boost.org/LICENSE_1_0.txt)
+=============================================================================*/
+#if !defined(BOOST_SPIRIT_QUICKBOOK_UTILS_HPP)
+#define BOOST_SPIRIT_QUICKBOOK_UTILS_HPP
+
+#include <string>
+#include <ostream>
+#include <boost/range/algorithm_ext/push_back.hpp>
+#include <boost/range/adaptor/transformed.hpp>
+
+namespace quickbook { namespace detail {
+    void print_char(char ch, std::ostream& out);
+    void print_string(std::basic_string<char> const& str, std::ostream& out);
+    char filter_identifier_char(char ch);
+
+    template <typename Range>
+    inline std::string
+    make_identifier(Range const& range)
+    {
+        std::string out_name;
+
+        boost::push_back(out_name,
+            range | boost::adaptors::transformed(filter_identifier_char));
+
+        return out_name;
+    }
+
+    std::string escape_uri(std::string uri);
+
+    // given a file extension, return the type of the source file
+    // we'll have an internal database for known file types.
+
+    enum file_type
+    {
+        cpp_file
+      , python_file
+    };
+
+    file_type get_file_type(std::string const& extension);
+}}
+
+#endif // BOOST_SPIRIT_QUICKBOOK_UTILS_HPP
+