116 lines
4.3 KiB
C++
116 lines
4.3 KiB
C++
/*=============================================================================
|
|
Boost.Wave: A Standard compliant C++ preprocessor library
|
|
Example demonstrating how to preprocess the token stream generated by a
|
|
#pragma directive
|
|
|
|
http://www.boost.org/
|
|
|
|
Copyright (c) 2001-2010 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 special preprocessing hooks
|
|
#include "preprocess_pragma_output.hpp"
|
|
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
// main entry point
|
|
int main(int argc, char *argv[])
|
|
{
|
|
if (2 != argc) {
|
|
std::cerr << "Usage: preprocess_pragma_output 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.
|
|
typedef boost::wave::context<
|
|
std::string::iterator, lex_iterator_type,
|
|
boost::wave::iteration_context_policies::load_file_to_string,
|
|
preprocess_pragma_output_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 is to be used additionally 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]);
|
|
|
|
// analyze the input file
|
|
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;
|
|
}
|