| /*============================================================================= |
| Boost.Wave: A Standard compliant C++ preprocessor library |
| |
| Sample showing how to correct the positions inside the returned tokens in |
| a way that these appear to be consecutive (ignoring positions from macro |
| definitions). |
| |
| 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 <iomanip> |
| #include <string> |
| #include <vector> |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Include Wave itself |
| #include <boost/wave.hpp> |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // Include the lexer stuff |
| #include "real_position_token.hpp" // token class |
| #include <boost/wave/cpplexer/cpp_lex_iterator.hpp> // lexer type |
| |
| #include "correct_token_positions.hpp" |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // |
| // Special output operator for a lex_token. |
| // |
| // Note: this doesn't compile if BOOST_SPIRIT_DEBUG is defined. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| template <typename PositionT> |
| inline std::ostream & |
| operator<< (std::ostream &stream, lex_token<PositionT> const &t) |
| { |
| using namespace std; |
| using namespace boost::wave; |
| |
| token_id id = token_id(t); |
| stream << setw(16) |
| << left << boost::wave::get_token_name(id) << " (" |
| << "#" << setw(3) << BASEID_FROM_TOKEN(id); |
| |
| if (ExtTokenTypeMask & id) { |
| // this is an extended token id |
| if (AltTokenType == (id & ExtTokenOnlyMask)) { |
| stream << ", AltTokenType"; |
| } |
| else if (TriGraphTokenType == (id & ExtTokenOnlyMask)) { |
| stream << ", TriGraphTokenType"; |
| } |
| else if (AltExtTokenType == (id & ExtTokenOnlyMask)){ |
| stream << ", AltExtTokenType"; |
| } |
| } |
| |
| stream << "): >"; |
| |
| typedef typename lex_token<PositionT>::string_type string_type; |
| |
| string_type const& value = t.get_value(); |
| for (std::size_t i = 0; i < value.size(); ++i) { |
| switch (value[i]) { |
| case '\r': stream << "\\r"; break; |
| case '\n': stream << "\\n"; break; |
| case '\t': stream << "\\t"; break; |
| default: |
| stream << value[i]; |
| break; |
| } |
| } |
| stream << "<" << std::endl; |
| stream << " at: " << t.get_position().get_file() << " (" |
| << setw(3) << right << t.get_position().get_line() << "/" |
| << setw(2) << right << t.get_position().get_column() |
| << ")" << std::endl; |
| stream << " and: " << t.get_corrected_position().get_file() << " (" |
| << setw(3) << right << t.get_corrected_position().get_line() << "/" |
| << setw(2) << right << t.get_corrected_position().get_column() |
| << ")"; |
| |
| return stream; |
| } |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| // main entry point |
| int main(int argc, char *argv[]) |
| { |
| if (2 != argc) { |
| std::cerr << "Usage: real_positions 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 real_positions::lex_token<> is the token type to be |
| // used by the Wave library. |
| typedef 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, |
| correct_token_position<token_type> > |
| context_type; |
| |
| // This preprocessor hooks are used to correct the file positions inside |
| // the tokens returned from the library |
| correct_token_position<token_type> hooks(argv[1]); |
| |
| // 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], hooks); |
| |
| // 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 << std::endl; |
| ++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; |
| } |