| // 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 <vector> |
| |
| #include <boost/spirit/include/qi.hpp> |
| #include <boost/spirit/include/support_multi_pass.hpp> |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| /////////////////////////////////////////////////////////////////////////////// |
| //[tutorial_multi_pass |
| int main() |
| { |
| namespace spirit = boost::spirit; |
| using spirit::ascii::space; |
| using spirit::ascii::char_; |
| using spirit::qi::double_; |
| using spirit::qi::eol; |
| |
| std::ifstream in("multi_pass.txt"); // we get our input from this file |
| if (!in.is_open()) { |
| std::cout << "Could not open input file: 'multi_pass.txt'" << std::endl; |
| return -1; |
| } |
| |
| typedef std::istreambuf_iterator<char> base_iterator_type; |
| spirit::multi_pass<base_iterator_type> first = |
| spirit::make_default_multi_pass(base_iterator_type(in)); |
| |
| std::vector<double> v; |
| bool result = spirit::qi::phrase_parse(first |
| , spirit::make_default_multi_pass(base_iterator_type()) |
| , double_ >> *(',' >> double_) // recognize list of doubles |
| , space | '#' >> *(char_ - eol) >> eol // comment skipper |
| , v); // data read from file |
| |
| if (!result) { |
| std::cout << "Failed parsing input file!" << std::endl; |
| return -2; |
| } |
| |
| std::cout << "Successfully parsed input file!" << std::endl; |
| return 0; |
| } |
| //] |
