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1 | /*============================================================================= |
2 | Copyright (c) 2016 Frank Hein, maxence business consulting gmbh | |
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 | ==============================================================================*/ | |
f67539c2 TL |
7 | #ifndef BOOST_SPIRIT_QI_DIRECTIVE_EXPECT_HPP |
8 | #define BOOST_SPIRIT_QI_DIRECTIVE_EXPECT_HPP | |
b32b8144 FG |
9 | |
10 | #if defined(_MSC_VER) | |
11 | #pragma once | |
12 | #endif | |
13 | ||
14 | #include <boost/spirit/home/qi/meta_compiler.hpp> | |
15 | #include <boost/spirit/home/support/has_semantic_action.hpp> | |
16 | #include <boost/spirit/home/qi/detail/attributes.hpp> | |
17 | #include <boost/spirit/home/qi/detail/expectation_failure.hpp> | |
18 | #include <boost/spirit/home/support/common_terminals.hpp> | |
19 | #include <boost/spirit/home/support/handles_container.hpp> | |
20 | #include <boost/spirit/home/support/unused.hpp> | |
21 | #include <boost/spirit/home/support/info.hpp> | |
22 | ||
23 | namespace boost { namespace spirit { | |
24 | /////////////////////////////////////////////////////////////////////////// | |
25 | // Enablers | |
26 | /////////////////////////////////////////////////////////////////////////// | |
27 | template <> | |
28 | struct use_directive<qi::domain, tag::expect> // enables expect[p] | |
29 | : mpl::true_ {}; | |
30 | }} | |
31 | ||
32 | namespace boost { namespace spirit { namespace qi { | |
33 | ||
34 | #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS | |
35 | using spirit::expect; | |
36 | #endif | |
37 | using spirit::expect_type; | |
38 | ||
39 | template <typename Subject> | |
40 | struct expect_directive : unary_parser<expect_directive<Subject> > | |
41 | { | |
42 | typedef result_of::compile<domain, Subject> subject_type; | |
43 | ||
44 | template <typename Context, typename Iterator> | |
45 | struct attribute | |
46 | { | |
47 | typedef traits::attribute_of<subject_type, Context, Iterator> | |
48 | type; | |
49 | }; | |
50 | ||
51 | expect_directive(Subject const& subject_) : subject(subject_) {} | |
52 | ||
53 | template <typename Iterator, typename Context | |
54 | , typename Skipper, typename Attribute> | |
55 | bool parse(Iterator& first, Iterator const& last | |
56 | , Context& context, Skipper const& skipper | |
57 | , Attribute& attr_) const | |
58 | { | |
59 | typedef expectation_failure<Iterator> exception; | |
60 | ||
61 | if (!subject.parse(first, last, context, skipper, attr_)) | |
62 | { | |
63 | boost::throw_exception( | |
64 | exception(first, last, subject.what(context))); | |
65 | #if defined(BOOST_NO_EXCEPTIONS) | |
66 | return false; // for systems not supporting exceptions | |
67 | #endif | |
68 | } | |
69 | return true; | |
70 | } | |
71 | ||
72 | template <typename Context> | |
73 | info what(Context& context) const | |
74 | { | |
75 | return info("expect", subject.what(context)); | |
76 | } | |
77 | ||
78 | Subject subject; | |
79 | }; | |
80 | ||
81 | /////////////////////////////////////////////////////////////////////////// | |
82 | // Parser generators: make_xxx function (objects) | |
83 | /////////////////////////////////////////////////////////////////////////// | |
84 | template <typename Subject, typename Modifiers> | |
85 | struct make_directive<tag::expect, Subject, Modifiers> | |
86 | { | |
87 | typedef expect_directive<Subject> result_type; | |
88 | ||
89 | result_type operator() | |
90 | (unused_type, Subject const& subject, unused_type) const | |
91 | { | |
92 | return result_type(subject); | |
93 | } | |
94 | }; | |
95 | ||
96 | }}} | |
97 | ||
98 | namespace boost { namespace spirit { namespace traits { | |
99 | /////////////////////////////////////////////////////////////////////////// | |
100 | template <typename Subject> | |
101 | struct has_semantic_action<qi::expect_directive<Subject> > | |
102 | : unary_has_semantic_action<Subject> {}; | |
103 | ||
104 | /////////////////////////////////////////////////////////////////////////// | |
105 | template <typename Subject, typename Attribute | |
106 | , typename Context, typename Iterator> | |
107 | struct handles_container< | |
108 | qi::expect_directive<Subject>, Attribute, Context, Iterator | |
109 | > | |
110 | : unary_handles_container<Subject, Attribute, Context, Iterator> {}; | |
111 | }}} | |
112 | ||
113 | #endif |