[857] | 1 | /*=============================================================================
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| 2 | Boost.Wave: A Standard compliant C++ preprocessor library
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| 3 |
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| 4 | Definition of the abstract lexer interface
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| 5 |
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| 6 | http://www.boost.org/
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| 7 |
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| 8 | Copyright (c) 2001-2005 Hartmut Kaiser. Distributed under the Boost
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| 9 | Software License, Version 1.0. (See accompanying file
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| 10 | LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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| 11 | =============================================================================*/
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| 12 |
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| 13 | #if !defined(CPP_LEX_INTERFACE_HPP_E83F52A4_90AC_4FBE_A9A7_B65F7F94C497_INCLUDED)
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| 14 | #define CPP_LEX_INTERFACE_HPP_E83F52A4_90AC_4FBE_A9A7_B65F7F94C497_INCLUDED
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| 15 |
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| 16 | #include <boost/wave/util/file_position.hpp>
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| 17 | #include <boost/wave/language_support.hpp>
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| 18 |
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| 19 | ///////////////////////////////////////////////////////////////////////////////
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| 20 | namespace boost {
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| 21 | namespace wave {
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| 22 | namespace cpplexer {
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| 23 |
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| 24 | ///////////////////////////////////////////////////////////////////////////////
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| 25 | //
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| 26 | // new_lexer_gen: generates a new instance of the required C++ lexer
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| 27 | //
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| 28 | ///////////////////////////////////////////////////////////////////////////////
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| 29 | template <typename TokenT> struct lex_input_interface;
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| 30 |
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| 31 | template <
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| 32 | typename IteratorT,
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| 33 | typename PositionT = boost::wave::util::file_position_type
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| 34 | >
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| 35 | struct new_lexer_gen
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| 36 | {
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| 37 | // The NewLexer function allows the opaque generation of a new lexer object.
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| 38 | // It is coupled to the token type to allow to decouple the lexer/token
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| 39 | // configurations at compile time.
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| 40 | static lex_input_interface<lex_token<PositionT> > *
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| 41 | new_lexer(IteratorT const &first, IteratorT const &last,
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| 42 | PositionT const &pos, boost::wave::language_support language);
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| 43 | };
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| 44 |
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| 45 | ///////////////////////////////////////////////////////////////////////////////
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| 46 | //
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| 47 | // The lex_input_interface decouples the lex_iterator_shim from the actual
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| 48 | // lexer. This is done to allow compile time reduction.
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| 49 | // Thanks to JCAB for having this idea.
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| 50 | //
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| 51 | ///////////////////////////////////////////////////////////////////////////////
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| 52 |
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| 53 | template <typename TokenT>
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| 54 | struct lex_input_interface
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| 55 | {
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| 56 | typedef typename TokenT::position_type position_type;
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| 57 |
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| 58 | virtual TokenT get() = 0;
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| 59 | virtual void set_position(position_type const &pos) = 0;
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| 60 |
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| 61 | virtual ~lex_input_interface() {}
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| 62 |
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| 63 | // The new_lexer function allows the opaque generation of a new lexer object.
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| 64 | // It is coupled to the token type to allow to distinguish different
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| 65 | // lexer/token configurations at compile time.
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| 66 | template <typename IteratorT>
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| 67 | static lex_input_interface *
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| 68 | new_lexer(IteratorT const &first, IteratorT const &last,
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| 69 | position_type const &pos, boost::wave::language_support language)
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| 70 | {
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| 71 | return new_lexer_gen<IteratorT, position_type>::new_lexer (first, last,
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| 72 | pos, language);
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| 73 | }
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| 74 | };
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| 75 |
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| 76 | ///////////////////////////////////////////////////////////////////////////////
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| 77 | } // namespace cpplexer
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| 78 | } // namespace wave
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| 79 | } // namespace boost
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| 80 |
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| 81 | #endif // !defined(CPP_LEX_INTERFACE_HPP_E83F52A4_90AC_4FBE_A9A7_B65F7F94C497_INCLUDED)
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