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1 | /*============================================================================= |
2 | Copyright (c) 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 "test.hpp" | |
10 | ||
11 | namespace x3 = boost::spirit::x3; | |
12 | ||
13 | struct my_tag; | |
14 | ||
15 | struct my_rule_class | |
16 | { | |
17 | template <typename Iterator, typename Exception, typename Context> | |
18 | x3::error_handler_result | |
92f5a8d4 | 19 | on_error(Iterator&, Iterator const&, Exception const&, Context const& context) |
7c673cae FG |
20 | { |
21 | x3::get<my_tag>(context)++; | |
22 | return x3::error_handler_result::fail; | |
23 | } | |
24 | ||
25 | template <typename Iterator, typename Attribute, typename Context> | |
26 | inline void | |
27 | on_success(Iterator const&, Iterator const&, Attribute&, Context const& context) | |
28 | { | |
29 | x3::get<my_tag>(context)++; | |
30 | } | |
31 | }; | |
32 | ||
33 | int | |
34 | main() | |
35 | { | |
36 | using spirit_test::test_attr; | |
37 | using spirit_test::test; | |
38 | ||
39 | using boost::spirit::x3::rule; | |
40 | using boost::spirit::x3::int_; | |
41 | using boost::spirit::x3::with; | |
42 | ||
43 | { // injecting data into the context in the grammar | |
44 | ||
45 | int val = 0; | |
46 | auto r = rule<my_rule_class, char const*>() = | |
47 | '(' > int_ > ',' > int_ > ')' | |
48 | ; | |
49 | ||
50 | auto start = | |
51 | with<my_tag>(std::ref(val)) [ r ] | |
52 | ; | |
53 | ||
54 | BOOST_TEST(test("(123,456)", start)); | |
55 | BOOST_TEST(!test("(abc,def)", start)); | |
56 | BOOST_TEST(val == 2); | |
57 | } | |
58 | ||
11fdf7f2 TL |
59 | { // injecting non-const lvalue into the context |
60 | int val = 0; | |
61 | auto const r = int_[([](auto& ctx){ | |
62 | x3::get<my_tag>(ctx) += x3::_attr(ctx); | |
63 | })]; | |
64 | BOOST_TEST(test("123,456", with<my_tag>(val)[r % ','])); | |
65 | BOOST_TEST(579 == val); | |
66 | } | |
67 | ||
68 | { // injecting rvalue into the context | |
69 | auto const r1 = int_[([](auto& ctx){ | |
70 | x3::get<my_tag>(ctx) += x3::_attr(ctx); | |
71 | })]; | |
72 | auto const r2 = rule<struct my_rvalue_rule_class, int>() = | |
73 | x3::lit('(') >> (r1 % ',') >> x3::lit(')')[([](auto& ctx){ | |
74 | x3::_val(ctx) = x3::get<my_tag>(ctx); | |
75 | })]; | |
76 | int attr = 0; | |
77 | BOOST_TEST(test_attr("(1,2,3)", with<my_tag>(100)[r2], attr)); | |
78 | BOOST_TEST(106 == attr); | |
79 | } | |
80 | ||
81 | { // injecting const/non-const lvalue and rvalue into the context | |
82 | struct functor { | |
83 | int operator()(int& val) { | |
84 | return val * 10; // non-const ref returns 10 * injected val | |
85 | } | |
86 | int operator()(int const& val) { | |
87 | return val; // const ref returns injected val | |
88 | } | |
89 | }; | |
90 | ||
91 | auto f = [](auto& ctx){ | |
92 | x3::_val(ctx) = x3::_attr(ctx) + functor()(x3::get<my_tag>(ctx)); | |
93 | }; | |
94 | auto const r = rule<struct my_rule_class2, int>() = int_[f]; | |
95 | ||
96 | int attr = 0; | |
97 | int const cval = 10; | |
98 | BOOST_TEST(test_attr("5", with<my_tag>(cval)[r], attr)); | |
99 | BOOST_TEST(15 == attr); // x3::get returns const ref to cval | |
100 | ||
101 | attr = 0; | |
102 | int val = 10; | |
103 | BOOST_TEST(test_attr("5", with<my_tag>(val)[r], attr)); | |
104 | BOOST_TEST(105 == attr); // x3::get returns ref to val | |
105 | ||
106 | attr = 0; | |
107 | ||
108 | BOOST_TEST(test_attr("5", with<my_tag>(10)[r], attr)); | |
109 | // x3::get returns ref to member variable of with_directive | |
110 | BOOST_TEST(105 == attr); | |
111 | } | |
112 | ||
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113 | return boost::report_errors(); |
114 | } |