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- /*=============================================================================
- 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;
- }
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