ceph/src/boost/libs/spirit/test/x3/actions.cpp

   1 /*=============================================================================
   2     Copyright (c) 2001-2015 Joel de Guzman
   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 #include <boost/spirit/home/x3.hpp>
   9 #include <cstring>
  10 #include <functional>
  11
  12 namespace x3 = boost::spirit::x3;
  13
  14 int x = 0;
  15
  16 auto fun1 =
  17     [](auto& ctx)
  18     {
  19         x += x3::_attr(ctx);
  20     }
  21 ;
  22
  23 struct fun_action
  24 {
  25     template <typename Context>
  26     void operator()(Context const& ctx) const
  27     {
  28         x += x3::_attr(ctx);
  29     }
  30 };
  31
  32 auto fail =
  33     [](auto& ctx)
  34     {
  35         x3::_pass(ctx) = false;
  36     }
  37 ;
  38
  39 struct setnext
  40 {
  41     setnext(char& next) : next(next) {}
  42
  43     template <typename Context>
  44     void operator()(Context const& ctx) const
  45     {
  46         next = x3::_attr(ctx);
  47     }
  48
  49     char& next;
  50 };
  51
  52 int main()
  53 {
  54     using x3::int_;
  55
  56     {
  57         char const *s1 = "{42}", *e1 = s1 + std::strlen(s1);
  58         x3::parse(s1, e1, '{' >> int_[fun1] >> '}');
  59     }
  60
  61
  62     {
  63         char const *s1 = "{42}", *e1 = s1 + std::strlen(s1);
  64         x3::parse(s1, e1, '{' >> int_[fun_action()] >> '}');
  65     }
  66
  67     {
  68         using namespace std::placeholders;
  69         char const *s1 = "{42}", *e1 = s1 + std::strlen(s1);
  70         x3::parse(s1, e1, '{' >> int_[std::bind(fun_action(), _1)] >> '}');
  71     }
  72
  73     BOOST_TEST(x == (42*3));
  74
  75     {
  76        std::string input("1234 6543");
  77        char next = '\0';
  78        BOOST_TEST(x3::phrase_parse(input.begin(), input.end(),
  79           x3::int_[fail] | x3::digit[setnext(next)], x3::space));
  80        BOOST_TEST(next == '1');
  81     }
  82
  83     return boost::report_errors();
  84 }