ceph/src/boost/libs/spirit/test/qi/regression_reorder.cpp

   1 //  Copyright (c) 2010 Olaf Peter
   2 //  Copyright (c) 2001-2010 Hartmut Kaiser
   3 //
   4 //  Distributed under the Boost Software License, Version 1.0. (See accompanying
   5 //  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   6
   7 #include <boost/detail/lightweight_test.hpp>
   8
   9 #include <boost/spirit/include/qi.hpp>
  10 #include <boost/fusion/include/nview.hpp>
  11
  12 namespace qi = boost::spirit::qi;
  13 namespace ascii = boost::spirit::ascii;
  14 namespace phx = boost::phoenix;
  15 namespace fusion = boost::fusion;
  16 namespace mpl = boost::mpl;
  17
  18 int main()
  19 {
  20     using fusion::result_of::as_nview;
  21     using fusion::at_c;
  22     using boost::optional;
  23     using boost::variant;
  24     using ascii::space_type;
  25     using ascii::no_case;
  26     using qi::lit;
  27     using qi::double_;
  28
  29     typedef fusion::vector<
  30         optional<double>,    // 0 - U
  31         optional<double>,    // 1 - V
  32         optional<double>     // 2 - W
  33     > uvw_type;
  34
  35     typedef as_nview<uvw_type, 0, 1, 2>::type uvw_reordered_type;
  36     typedef as_nview<uvw_type, 2, 0, 1>::type vwu_reordered_type;
  37
  38     typedef char const* iterator_type;
  39
  40     qi::rule<iterator_type, optional<double>(), space_type> u,v,w;
  41     qi::rule<iterator_type, uvw_reordered_type(), space_type> uvw;
  42     qi::rule<iterator_type, vwu_reordered_type(), space_type> vwu;
  43
  44     u = no_case[ "NA" ] | ( double_ >> -lit( "U" ) );
  45     v = no_case[ "NA" ] | ( double_ >> -lit( "V" ) );
  46     w = no_case[ "NA" ] | ( double_ >> -lit( "W" ) );
  47
  48     uvw = u > v > w;
  49     vwu = v > w > u;
  50
  51     uvw_type uvw_data;
  52     {
  53         iterator_type first = "1U 2V 3W";
  54         iterator_type last  = first + std::strlen(first);
  55
  56         uvw_reordered_type uvw_result( uvw_data );
  57
  58         BOOST_TEST(qi::phrase_parse(first, last, uvw, ascii::space, uvw_result));
  59         BOOST_TEST(fusion::at_c<0>(uvw_result) && *fusion::at_c<0>(uvw_result) == 1);
  60         BOOST_TEST(fusion::at_c<1>(uvw_result) && *fusion::at_c<1>(uvw_result) == 2);
  61         BOOST_TEST(fusion::at_c<2>(uvw_result) && *fusion::at_c<2>(uvw_result) == 3);
  62     }
  63
  64     {
  65         iterator_type first = "2V 3W 1U";
  66         iterator_type last  = first + std::strlen(first);
  67
  68         vwu_reordered_type uvw_result(uvw_data);
  69
  70         BOOST_TEST(qi::phrase_parse(first, last, vwu, ascii::space, uvw_result));
  71         BOOST_TEST(fusion::at_c<0>(uvw_result) && *fusion::at_c<0>(uvw_result) == 2);
  72         BOOST_TEST(fusion::at_c<1>(uvw_result) && *fusion::at_c<1>(uvw_result) == 3);
  73         BOOST_TEST(fusion::at_c<2>(uvw_result) && *fusion::at_c<2>(uvw_result) == 1);
  74     }
  75
  76     return boost::report_errors();
  77 }
  78
  79