ceph/src/boost/libs/wave/samples/waveidl/idllexer/idl_lex_interface.hpp

   1 /*=============================================================================
   2     Boost.Wave: A Standard compliant C++ preprocessor library
   3
   4     Definition of the abstract lexer interface
   5
   6     http://www.boost.org/
   7
   8     Copyright (c) 2001-2010 Hartmut Kaiser. Distributed under the Boost
   9     Software License, Version 1.0. (See accompanying file
  10     LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
  11 =============================================================================*/
  12
  13 #if !defined(IDL_LEX_INTERFACE_HPP_INCLUDED)
  14 #define IDL_LEX_INTERFACE_HPP_INCLUDED
  15
  16 #include <boost/wave/util/file_position.hpp>
  17 #include <boost/wave/language_support.hpp>
  18 #include <boost/wave/cpplexer/cpp_lex_interface_generator.hpp>
  19
  20 ///////////////////////////////////////////////////////////////////////////////
  21 namespace boost {
  22 namespace wave {
  23 namespace idllexer {
  24
  25 ///////////////////////////////////////////////////////////////////////////////
  26 //
  27 //  new_lexer_gen: generates a new instance of the required C++ lexer
  28 //
  29 ///////////////////////////////////////////////////////////////////////////////
  30 template <
  31     typename IteratorT,
  32     typename PositionT = boost::wave::util::file_position_type
  33 >
  34 struct new_lexer_gen
  35 {
  36 //  The NewLexer function allows the opaque generation of a new lexer object.
  37 //  It is coupled to the token type to allow to decouple the lexer/token
  38 //  configurations at compile time.
  39     static cpplexer::lex_input_interface<
  40         cpplexer::lex_token<PositionT>
  41     > *
  42     new_lexer(IteratorT const &first, IteratorT const &last,
  43         PositionT const &pos, boost::wave::language_support language);
  44 };
  45
  46 ///////////////////////////////////////////////////////////////////////////////
  47 //
  48 //  The lex_input_interface decouples the lex_iterator_shim from the actual
  49 //  lexer. This is done to allow compile time reduction.
  50 //  Thanks to JCAB for having this idea.
  51 //
  52 ///////////////////////////////////////////////////////////////////////////////
  53
  54 template <typename TokenT>
  55 struct lex_input_interface_generator
  56 :   cpplexer::lex_input_interface<TokenT>
  57 {
  58     typedef typename cpplexer::lex_input_interface<TokenT>::position_type position_type;
  59
  60 //  The new_lexer function allows the opaque generation of a new lexer object.
  61 //  It is coupled to the token type to allow to distinguish different
  62 //  lexer/token configurations at compile time.
  63     template <typename IteratorT>
  64     static cpplexer::lex_input_interface<TokenT> *
  65     new_lexer(IteratorT const &first, IteratorT const &last,
  66         position_type const &pos, boost::wave::language_support language)
  67     {
  68         return new_lexer_gen<IteratorT, position_type>::new_lexer (first, last,
  69             pos, language);
  70     }
  71 };
  72
  73 ///////////////////////////////////////////////////////////////////////////////
  74 }   // namespace cpplexer
  75 }   // namespace wave
  76 }   // namespace boost
  77
  78 #endif // !defined(IDL_LEX_INTERFACE_HPP_INCLUDED)