ceph/src/boost/libs/spirit/classic/test/shortest_alternative_tests.cpp

   1 //
   2 //  Copyright (c) 2004 Joao Abecasis
   3 //
   4 //  Use, modification and distribution is subject to the Boost Software
   5 //  License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
   6 //  http://www.boost.org/LICENSE_1_0.txt)
   7 //
   8
   9 #include <boost/spirit/include/classic_core.hpp>
  10 #include <boost/detail/lightweight_test.hpp>
  11
  12 using namespace BOOST_SPIRIT_CLASSIC_NS;
  13
  14 void shortest_alternative_parser_test()
  15 {
  16     typedef
  17         shortest_alternative<
  18             shortest_alternative<
  19                 shortest_alternative<
  20                     strlit<>,
  21                     strlit<> >,
  22                 strlit<> >,
  23             strlit<> >
  24     parser_t;
  25
  26     parser_t short_rule =
  27         shortest_d[
  28             str_p("a")
  29             | str_p("aa")
  30             | str_p("aaa")
  31             | str_p("aaaa")
  32         ];
  33
  34     BOOST_TEST(parse("a", short_rule).full);
  35     BOOST_TEST(parse("aa", short_rule).length == 1);
  36     BOOST_TEST(parse("aaa", short_rule).length == 1);
  37     BOOST_TEST(parse("aaaa", short_rule).length == 1);
  38
  39     short_rule =
  40         shortest_d[
  41             str_p("d")
  42             | str_p("cd")
  43             | str_p("bcd")
  44             | str_p("abcd")
  45         ];
  46
  47     BOOST_TEST(parse("d", short_rule).full);
  48     BOOST_TEST(parse("cd", short_rule).full);
  49     BOOST_TEST(parse("bcd", short_rule).full);
  50     BOOST_TEST(parse("abcd", short_rule).full);
  51 }
  52
  53 int
  54 main()
  55 {
  56     shortest_alternative_parser_test();
  57     return boost::report_errors();
  58 }