Added Wave review candidate to repository.

[SVN r1909]

samples/cpp_tokens/slex_interface.hpp

@@ -0,0 +1,82 @@
+/*=============================================================================
+    Wave: A Standard compliant C++ preprocessor library
+
+    Definition of the abstract lexer interface
+    
+    Copyright (c) 2001-2004 Hartmut Kaiser
+    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(SLEX_INTERFACE_HPP_E83F52A4_90AC_4FBE_A9A7_B65F7F94C497_INCLUDED)
+#define SLEX_INTERFACE_HPP_E83F52A4_90AC_4FBE_A9A7_B65F7F94C497_INCLUDED
+
+#include <boost/wave/language_support.hpp>
+#include <boost/wave/util/file_position.hpp>
+
+///////////////////////////////////////////////////////////////////////////////
+namespace boost {
+namespace wave {
+namespace cpp_token_sample {
+
+///////////////////////////////////////////////////////////////////////////////
+//  
+//  new_lexer_gen: generates a new instance of the required C++ lexer
+//
+///////////////////////////////////////////////////////////////////////////////
+template <typename TokenT> struct slex_input_interface; 
+
+template <
+    typename IteratorT, 
+    typename PositionT = boost::wave::util::file_position_t
+>
+struct new_lexer_gen
+{
+//  The NewLexer function allows the opaque generation of a new lexer object.
+//  It is coupled to the token type to allow to decouple the lexer/token 
+//  configurations at compile time.
+    static slex_input_interface<slex_token<PositionT> > *
+    new_lexer(IteratorT const &first, IteratorT const &last, 
+        PositionT const &pos, boost::wave::language_support language);
+};
+
+///////////////////////////////////////////////////////////////////////////////
+//
+//  The lex_input_interface decouples the lex_iterator_shim from the actual 
+//  lexer. This is done to allow compile time reduction.
+//  Thanks to JCAB for having this idea.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+template <typename TokenT>
+struct slex_input_interface 
+{
+    typedef typename TokenT::position_t position_t;
+    
+    virtual TokenT get() = 0;
+    virtual void set_position(position_t const &pos) = 0;
+
+    virtual ~slex_input_interface() {}
+    
+//  The new_lexer function allows the opaque generation of a new lexer object.
+//  It is coupled to the token type to allow to distinguish different 
+//  lexer/token configurations at compile time.
+    template <typename IteratorT>
+    static slex_input_interface *
+    new_lexer(IteratorT const &first, IteratorT const &last, 
+        position_t const &pos, boost::wave::language_support language)
+    { 
+        return new_lexer_gen<IteratorT, position_t>::new_lexer (first, last, 
+            pos, language); 
+    }
+};
+
+///////////////////////////////////////////////////////////////////////////////
+}   // namespace cpp_token_sample
+}   // namespace wave
+}   // namespace boost 
+
+#endif // !defined(SLEX_INTERFACE_HPP_E83F52A4_90AC_4FBE_A9A7_B65F7F94C497_INCLUDED)