1 // Copyright (c) 2001-2011 Hartmut Kaiser
2 // Copyright (c) 2011 Dean Michael Berries
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/config/warning_disable.hpp>
9
10 #include <boost/spirit/include/qi.hpp>
11 #include <boost/fusion/tuple.hpp>
12 #include <string>
13
14 struct foo_parts
15 {
16 boost::optional<std::string> first;
17 std::string second;
18 };
19
20 namespace boost { namespace spirit { namespace traits
21 {
22 template <>
23 struct transform_attribute<foo_parts
24 , fusion::tuple<std::string &, optional<std::string> &>
25 , spirit::qi::domain>
26 {
27 typedef fusion::tuple<std::string&, optional<std::string>&> type;
28
preboost::spirit::traits::transform_attribute29 static type pre(foo_parts & parts)
30 {
31 return fusion::tie(parts.second, parts.first);
32 }
33
postboost::spirit::traits::transform_attribute34 static void post(foo_parts &, type const &) {}
failboost::spirit::traits::transform_attribute35 static void fail(foo_parts &) {}
36 };
37 }}}
38
39 namespace qi = boost::spirit::qi;
40
41 template <typename Iterator>
42 struct foo_grammar : qi::grammar<Iterator, foo_parts()>
43 {
foo_grammarfoo_grammar44 foo_grammar() : foo_grammar::base_type(start, "foo")
45 {
46 foo_part =
47 +qi::alpha >> -(+qi::digit)
48 | qi::attr(std::string())
49 >> qi::attr(boost::optional<std::string>())
50 ;
51
52 start = foo_part.alias();
53 }
54
55 typedef boost::fusion::tuple<std::string&, boost::optional<std::string>&>
56 tuple_type;
57
58 qi::rule<Iterator, tuple_type()> foo_part;
59 qi::rule<Iterator, foo_parts()> start;
60 };
61
main()62 int main()
63 {
64 foo_parts instance;
65 foo_grammar<std::string::iterator> grammar;
66 std::string input = "abc123";
67
68 BOOST_TEST(qi::parse(input.begin(), input.end(), grammar, instance) &&
69 instance.first && instance.first.get() == "123" &&
70 instance.second == "abc");
71
72 return boost::report_errors();
73 }
74
75