Boost C++ Libraries

libs/spirit/example/qi/complex_number.cpp

/*=============================================================================
    Copyright (c) 2002-2007 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)
=============================================================================*/
///////////////////////////////////////////////////////////////////////////////
//
//  A complex number micro parser.
//
//  [ JDG May 10, 2002 ]    spirit1
//  [ JDG May 9, 2007 ]     spirit2
//
///////////////////////////////////////////////////////////////////////////////

#include <boost/config/warning_disable.hpp>
#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>

#include <iostream>
#include <string>
#include <complex>

using namespace boost::phoenix;
using namespace boost::spirit;
using namespace boost::spirit::qi;
using namespace boost::spirit::ascii;
using namespace boost::spirit::arg_names;

///////////////////////////////////////////////////////////////////////////////
//  Our complex number parser/compiler
///////////////////////////////////////////////////////////////////////////////
//[tutorial_complex_number
template <typename Iterator>
bool parse_complex(Iterator first, Iterator last, std::complex<double>& c)
{
    double rN = 0.0;
    double iN = 0.0;
    bool r = phrase_parse(first, last,

        //  Begin grammar
        (
                '(' >> double_[ref(rN) = _1]
                    >> -(',' >> double_[ref(iN) = _1]) >> ')'
            |   double_[ref(rN) = _1]
        ),
        //  End grammar

        space);

    if (!r || first != last) // fail if we did not get a full match
        return false;
    c = std::complex<double>(rN, iN);
    return r;
}
//]

////////////////////////////////////////////////////////////////////////////
//  Main program
////////////////////////////////////////////////////////////////////////////
int
main()
{
    std::cout << "/////////////////////////////////////////////////////////\n\n";
    std::cout << "\t\tA complex number micro parser for Spirit...\n\n";
    std::cout << "/////////////////////////////////////////////////////////\n\n";

    std::cout << "Give me a complex number of the form r or (r) or (r,i) \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::complex<double> c;
        if (parse_complex(str.begin(), str.end(), c))
        {
            std::cout << "-------------------------\n";
            std::cout << "Parsing succeeded\n";
            std::cout << "got: " << c << std::endl;
            std::cout << "\n-------------------------\n";
        }
        else
        {
            std::cout << "-------------------------\n";
            std::cout << "Parsing failed\n";
            std::cout << "-------------------------\n";
        }
    }

    std::cout << "Bye... :-) \n\n";
    return 0;
}