| /*============================================================================= |
| Copyright (c) 2002-2010 Hartmut Kaiser |
| Copyright (c) 2002-2010 Joel de Guzman |
| |
| 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) |
| =============================================================================*/ |
| /////////////////////////////////////////////////////////////////////////////// |
| // |
| // This sample demonstrates a generator for a comma separated list of numbers. |
| // No actions. It is based on the example qi/num_lists.cpp for reading in |
| // some numbers to generate. |
| // |
| /////////////////////////////////////////////////////////////////////////////// |
| |
| #include <boost/config/warning_disable.hpp> |
| #include <boost/spirit/include/qi.hpp> |
| #include <boost/spirit/include/karma.hpp> |
| |
| #include <iostream> |
| #include <string> |
| #include <vector> |
| |
| namespace client |
| { |
| /////////////////////////////////////////////////////////////////////////// |
| // Our number list parser, please see the example qi/numlist1.cpp for |
| // more information |
| /////////////////////////////////////////////////////////////////////////// |
| template <typename Iterator> |
| bool parse_numbers(Iterator first, Iterator last, std::vector<double>& v) |
| { |
| using boost::spirit::qi::double_; |
| using boost::spirit::qi::phrase_parse; |
| using boost::spirit::ascii::space; |
| |
| bool r = phrase_parse(first, last, double_ % ',', space, v); |
| if (first != last) |
| return false; |
| return r; |
| } |
| |
| //[tutorial_karma_numlist3_complex |
| // a simple complex number representation z = a + bi |
| struct complex |
| { |
| complex (double a, double b = 0.0) : a(a), b(b) {} |
| |
| double a; |
| double b; |
| }; |
| |
| // the streaming operator for the type complex |
| std::ostream& |
| operator<< (std::ostream& os, complex const& z) |
| { |
| os << "{" << z.a << "," << z.b << "}"; |
| return os; |
| } |
| //] |
| |
| /////////////////////////////////////////////////////////////////////////// |
| // Our number list generator |
| /////////////////////////////////////////////////////////////////////////// |
| //[tutorial_karma_numlist3 |
| template <typename OutputIterator, typename Container> |
| bool generate_numbers(OutputIterator& sink, Container const& v) |
| { |
| using boost::spirit::karma::stream; |
| using boost::spirit::karma::generate; |
| using boost::spirit::karma::eol; |
| |
| bool r = generate( |
| sink, // destination: output iterator |
| stream % eol, // the generator |
| v // the data to output |
| ); |
| return r; |
| } |
| //] |
| } |
| |
| //////////////////////////////////////////////////////////////////////////// |
| // Main program |
| //////////////////////////////////////////////////////////////////////////// |
| int |
| main() |
| { |
| std::cout << "/////////////////////////////////////////////////////////\n\n"; |
| std::cout << "\tA comma separated list generator for Spirit...\n\n"; |
| std::cout << "/////////////////////////////////////////////////////////\n\n"; |
| |
| std::cout << "Give me a comma separated list of numbers.\n"; |
| std::cout << "Type [q or Q] to quit\n\n"; |
| |
| std::string str; |
| while (getline(std::cin, str)) |
| { |
| if (str.empty() || str[0] == 'q' || str[0] == 'Q') |
| break; |
| |
| std::vector<double> v; // here we put the data gotten from input |
| if (client::parse_numbers(str.begin(), str.end(), v)) |
| { |
| // ok, we got some numbers, fill a vector of client::complex |
| // instances and print them back out |
| std::vector<client::complex> vc; |
| std::vector<double>::const_iterator end = v.end(); |
| for (std::vector<double>::const_iterator it = v.begin(); |
| it != end; ++it) |
| { |
| double real(*it); |
| if (++it != end) |
| vc.push_back(client::complex(real, *it)); |
| else { |
| vc.push_back(client::complex(real)); |
| break; |
| } |
| } |
| |
| std::cout << "-------------------------\n"; |
| |
| std::string generated; |
| std::back_insert_iterator<std::string> sink(generated); |
| if (!client::generate_numbers(sink, vc)) |
| { |
| std::cout << "-------------------------\n"; |
| std::cout << "Generating failed\n"; |
| std::cout << "-------------------------\n"; |
| } |
| else |
| { |
| std::cout << "-------------------------\n"; |
| std::cout << "Generated:\n" << generated << "\n"; |
| std::cout << "-------------------------\n"; |
| } |
| } |
| else |
| { |
| std::cout << "-------------------------\n"; |
| std::cout << "Parsing failed\n"; |
| std::cout << "-------------------------\n"; |
| } |
| } |
| |
| std::cout << "Bye... :-) \n\n"; |
| return 0; |
| } |
| |
| |