ceph/src/boost/libs/spirit/example/lex/static_lexer/word_count_generate.cpp

   1 //  Copyright (c) 2001-2010 Hartmut Kaiser
   2 //
   3 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 //  The purpose of this example is to show, how it is possible to use a lexer
   7 //  token definition for two purposes:
   8 //
   9 //    . To generate C++ code implementing a static lexical analyzer allowing
  10 //      to recognize all defined tokens (this file)
  11 //    . To integrate the generated C++ lexer into the /Spirit/ framework.
  12 //      (see the file: word_count_static.cpp)
  13
  14 // #define BOOST_SPIRIT_LEXERTL_DEBUG
  15
  16 #include <boost/config/warning_disable.hpp>
  17 #include <boost/spirit/include/lex_lexertl.hpp>
  18 #include <boost/spirit/include/lex_generate_static_lexertl.hpp>
  19
  20 #include <fstream>
  21
  22 #include "word_count_tokens.hpp"
  23
  24 using namespace boost::spirit;
  25
  26 ///////////////////////////////////////////////////////////////////////////////
  27 //[wc_static_generate_main
  28 int main(int argc, char* argv[])
  29 {
  30     // create the lexer object instance needed to invoke the generator
  31     word_count_tokens<lex::lexertl::lexer<> > word_count; // the token definition
  32
  33     // open the output file, where the generated tokenizer function will be
  34     // written to
  35     std::ofstream out(argc < 2 ? "word_count_static.hpp" : argv[1]);
  36
  37     // invoke the generator, passing the token definition, the output stream
  38     // and the name suffix of the tables and functions to be generated
  39     //
  40     // The suffix "wc" used below results in a type lexertl::static_::lexer_wc
  41     // to be generated, which needs to be passed as a template parameter to the
  42     // lexertl::static_lexer template (see word_count_static.cpp).
  43     return lex::lexertl::generate_static_dfa(word_count, out, "wc") ? 0 : -1;
  44 }
  45 //]