word_count_generate.cpp

来自「Boost provides free peer-reviewed portab」· C++ 代码 · 共 44 行

//  Copyright (c) 2001-2008 Hartmut Kaiser
// 
//  Distributed under 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)

//  The purpose of this example is to show, how it is possible to use a lexer 
//  token definition for two purposes:
//
//    . To generate C++ code implementing a static lexical analyzer allowing
//      to recognize all defined tokens (this file)
//    . To integrate the generated C++ lexer into the /Spirit/ framework.
//      (see the file: word_count_static.cpp)

// #define BOOST_SPIRIT_LEXERTL_DEBUG

#include <boost/config/warning_disable.hpp>
#include <boost/spirit/include/lex_lexer_lexertl.hpp>
#include <boost/spirit/home/lex/lexer/lexertl/lexertl_generate_static.hpp>

#include <fstream>

#include "word_count_tokens.hpp"

using namespace boost::spirit;
using namespace boost::spirit::lex;

///////////////////////////////////////////////////////////////////////////////
//[wc_static_generate_main
int main(int argc, char* argv[])
{
    // create the lexer object instance needed to invoke the generator
    word_count_tokens<lexertl_lexer<> > word_count; // the token definition

    // open the output file, where the generated tokenizer function will be 
    // written to
    std::ofstream out(argc < 2 ? "word_count_static.hpp" : argv[1]);

    // invoke the generator, passing the token definition, the output stream 
    // and the name prefix of the tokenizing function to be generated
    char const* function_name = (argc < 3 ? "" : argv[2]);
    return generate_static(make_lexer(word_count), out, function_name) ? 0 : -1;
}
//]