122 lines
4.2 KiB
C++
122 lines
4.2 KiB
C++
/*=============================================================================
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Copyright (c) 2002-2010 Hartmut Kaiser
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Copyright (c) 2002-2010 Joel de Guzman
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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///////////////////////////////////////////////////////////////////////////////
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//
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// This sample demonstrates a generator for a comma separated list of numbers.
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// No actions. It is based on the example qi/num_lists.cpp for reading in
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// some numbers to generate.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include <boost/config/warning_disable.hpp>
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#include <boost/spirit/include/qi.hpp>
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#include <boost/spirit/include/karma.hpp>
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#include <iostream>
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#include <string>
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#include <list>
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namespace client
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{
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namespace qi = boost::spirit::qi;
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namespace karma = boost::spirit::karma;
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namespace ascii = boost::spirit::ascii;
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///////////////////////////////////////////////////////////////////////////
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// Our number list parser, please see the example qi/numlist1.cpp for
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// more information
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///////////////////////////////////////////////////////////////////////////
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template <typename Iterator>
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bool parse_numbers(Iterator first, Iterator last, std::list<double>& v)
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{
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using qi::double_;
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using qi::phrase_parse;
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using ascii::space;
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bool r = phrase_parse(first, last, double_ >> *(',' >> double_), space, v);
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if (first != last)
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return false;
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return r;
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}
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///////////////////////////////////////////////////////////////////////////
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// Our number list generator
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///////////////////////////////////////////////////////////////////////////
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//[tutorial_karma_numlist1
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template <typename OutputIterator>
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bool generate_numbers(OutputIterator& sink, std::list<double> const& v)
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{
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using karma::double_;
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using karma::generate_delimited;
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using ascii::space;
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bool r = generate_delimited(
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sink, // destination: output iterator
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double_ << *(',' << double_), // the generator
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space, // the delimiter-generator
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v // the data to output
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);
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return r;
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}
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//]
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}
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////////////////////////////////////////////////////////////////////////////
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// Main program
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////////////////////////////////////////////////////////////////////////////
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int
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main()
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{
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout << "\t\tA comma separated list generator for Spirit...\n\n";
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std::cout << "/////////////////////////////////////////////////////////\n\n";
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std::cout << "Give me a comma separated list of numbers.\n";
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std::cout << "Type [q or Q] to quit\n\n";
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std::string str;
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while (getline(std::cin, str))
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{
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if (str.empty() || str[0] == 'q' || str[0] == 'Q')
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break;
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std::list<double> v; // here we put the data to generate
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if (client::parse_numbers(str.begin(), str.end(), v))
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{
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// ok, we got some numbers, now print them back out
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std::cout << "-------------------------\n";
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std::string generated;
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std::back_insert_iterator<std::string> sink(generated);
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if (!client::generate_numbers(sink, v))
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{
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std::cout << "-------------------------\n";
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std::cout << "Generating failed\n";
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std::cout << "-------------------------\n";
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}
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else
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{
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std::cout << "-------------------------\n";
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std::cout << "Generated: " << generated << "\n";
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std::cout << "-------------------------\n";
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}
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}
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else
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{
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std::cout << "-------------------------\n";
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std::cout << "Parsing failed\n";
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std::cout << "-------------------------\n";
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}
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}
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std::cout << "Bye... :-) \n\n";
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return 0;
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}
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