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