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- /*=============================================================================
- Boost.Wave: A Standard compliant C++ preprocessor library
- Sample demonstrating the usage of advanced preprocessor hooks.
-
- http://www.boost.org/
- Copyright (c) 2001-2012 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)
- =============================================================================*/
- #include <iostream>
- #include <fstream>
- #include <string>
- #include <vector>
- ///////////////////////////////////////////////////////////////////////////////
- // Include Wave itself
- #include <boost/wave.hpp>
- ///////////////////////////////////////////////////////////////////////////////
- // Include the lexer stuff
- #include <boost/wave/cpplexer/cpp_lex_token.hpp> // token class
- #include <boost/wave/cpplexer/cpp_lex_iterator.hpp> // lexer class
- #include "custom_directives.hpp"
- ///////////////////////////////////////////////////////////////////////////////
- // Main entry point
- //
- // This sample shows how to use the advanced hooks to output not only the
- // preprocessed tokens but also the conditional directives found in the input
- // file (these are commented out, tough) and the tokens from inside the
- // conditional block which were not evaluated because the corresponding
- // condition was false. These tokens are commented out as well.
- //
- int main(int argc, char *argv[])
- {
- if (2 != argc) {
- std::cerr << "Usage: custom_directives infile" << std::endl;
- return -1;
- }
- // current file position is saved for exception handling
- boost::wave::util::file_position_type current_position;
- try {
- // Open and read in the specified input file.
- std::ifstream instream(argv[1]);
- std::string instring;
- if (!instream.is_open()) {
- std::cerr << "Could not open input file: " << argv[1] << std::endl;
- return -2;
- }
- instream.unsetf(std::ios::skipws);
- instring = std::string(std::istreambuf_iterator<char>(instream.rdbuf()),
- std::istreambuf_iterator<char>());
- // The template boost::wave::cpplexer::lex_token<> is the token type to be
- // used by the Wave library.
- typedef boost::wave::cpplexer::lex_token<> token_type;
- // The template boost::wave::cpplexer::lex_iterator<> is the lexer type to
- // be used by the Wave library.
- typedef boost::wave::cpplexer::lex_iterator<token_type> lex_iterator_type;
- // This is the resulting context type to use. The first template parameter
- // should match the iterator type to be used during construction of the
- // corresponding context object (see below).
- typedef boost::wave::context<std::string::iterator, lex_iterator_type,
- boost::wave::iteration_context_policies::load_file_to_string,
- custom_directives_hooks
- > context_type;
- // The preprocessor iterator shouldn't be constructed directly. It is
- // to be generated through a wave::context<> object. This wave:context<>
- // object additionally may be used to initialize and define different
- // parameters of the actual preprocessing (not done here).
- //
- // The preprocessing of the input stream is done on the fly behind the
- // scenes during iteration over the context_type::iterator_type stream.
- context_type ctx (instring.begin(), instring.end(), argv[1]);
- ctx.set_language(boost::wave::enable_long_long(ctx.get_language()));
- ctx.set_language(boost::wave::enable_preserve_comments(ctx.get_language()));
- ctx.set_language(boost::wave::enable_prefer_pp_numbers(ctx.get_language()));
- // analyze the input file, print out the preprocessed tokens
- context_type::iterator_type first = ctx.begin();
- context_type::iterator_type last = ctx.end();
- while (first != last) {
- current_position = (*first).get_position();
- std::cout << (*first).get_value();
- ++first;
- }
- }
- catch (boost::wave::cpp_exception const& e) {
- // some preprocessing error
- std::cerr
- << e.file_name() << "(" << e.line_no() << "): "
- << e.description() << std::endl;
- return 2;
- }
- catch (std::exception const& e) {
- // use last recognized token to retrieve the error position
- std::cerr
- << current_position.get_file()
- << "(" << current_position.get_line() << "): "
- << "exception caught: " << e.what()
- << std::endl;
- return 3;
- }
- catch (...) {
- // use last recognized token to retrieve the error position
- std::cerr
- << current_position.get_file()
- << "(" << current_position.get_line() << "): "
- << "unexpected exception caught." << std::endl;
- return 4;
- }
- return 0;
- }
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