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1 | // Copyright (c) 2001-2011 Hartmut Kaiser |
2 | // | |
3 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
4 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
5 | ||
6 | #if !defined(SPIRIT_KARMA_ATTR_CAST_SEP_26_2009_0348PM) | |
7 | #define SPIRIT_KARMA_ATTR_CAST_SEP_26_2009_0348PM | |
8 | ||
9 | #if defined(_MSC_VER) | |
10 | #pragma once | |
11 | #endif | |
12 | ||
13 | #include <boost/spirit/home/karma/meta_compiler.hpp> | |
14 | #include <boost/spirit/home/karma/generator.hpp> | |
15 | #include <boost/spirit/home/karma/domain.hpp> | |
16 | #include <boost/spirit/home/support/unused.hpp> | |
17 | #include <boost/spirit/home/support/info.hpp> | |
18 | #include <boost/spirit/home/support/common_terminals.hpp> | |
19 | #include <boost/spirit/home/karma/detail/attributes.hpp> | |
20 | #include <boost/spirit/home/support/auxiliary/attr_cast.hpp> | |
21 | ||
22 | namespace boost { namespace spirit | |
23 | { | |
24 | /////////////////////////////////////////////////////////////////////////// | |
25 | // enables attr_cast<>() pseudo generator | |
26 | template <typename Expr, typename Exposed, typename Transformed> | |
27 | struct use_terminal<karma::domain | |
28 | , tag::stateful_tag<Expr, tag::attr_cast, Exposed, Transformed> > | |
29 | : mpl::true_ {}; | |
30 | }} | |
31 | ||
32 | namespace boost { namespace spirit { namespace karma | |
33 | { | |
34 | #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS | |
35 | using spirit::attr_cast; | |
36 | #endif | |
37 | ||
38 | /////////////////////////////////////////////////////////////////////////// | |
39 | // attr_cast_generator consumes the attribute of subject generator without | |
40 | // generating anything | |
41 | /////////////////////////////////////////////////////////////////////////// | |
42 | template <typename Exposed, typename Transformed, typename Subject> | |
43 | struct attr_cast_generator | |
44 | : unary_generator<attr_cast_generator<Exposed, Transformed, Subject> > | |
45 | { | |
46 | typedef typename result_of::compile<karma::domain, Subject>::type | |
47 | subject_type; | |
48 | ||
49 | typedef mpl::int_<subject_type::properties::value> properties; | |
50 | ||
51 | typedef typename mpl::eval_if< | |
52 | traits::not_is_unused<Transformed> | |
53 | , mpl::identity<Transformed> | |
54 | , traits::attribute_of<subject_type> >::type | |
55 | transformed_attribute_type; | |
56 | ||
57 | attr_cast_generator(Subject const& subject) | |
58 | : subject(subject) | |
59 | { | |
60 | // If you got an error_invalid_expression error message here, | |
61 | // then the expression (Subject) is not a valid spirit karma | |
62 | // expression. | |
63 | BOOST_SPIRIT_ASSERT_MATCH(karma::domain, Subject); | |
64 | } | |
65 | ||
66 | // If Exposed is given, we use the given type, otherwise all we can do | |
67 | // is to guess, so we expose our inner type as an attribute and | |
68 | // deal with the passed attribute inside the parse function. | |
69 | template <typename Context, typename Unused> | |
70 | struct attribute | |
71 | : mpl::if_<traits::not_is_unused<Exposed>, Exposed | |
72 | , transformed_attribute_type> | |
73 | {}; | |
74 | ||
75 | template <typename OutputIterator, typename Context, typename Delimiter | |
76 | , typename Attribute> | |
77 | bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d | |
78 | , Attribute const& attr) const | |
79 | { | |
80 | typedef traits::transform_attribute< | |
81 | Attribute const, transformed_attribute_type, domain> | |
82 | transform; | |
83 | ||
84 | return compile<karma::domain>(subject).generate( | |
85 | sink, ctx, d, transform::pre(attr)); | |
86 | } | |
87 | ||
88 | template <typename Context> | |
89 | info what(Context& context) const | |
90 | { | |
91 | return info("attr_cast" | |
92 | , compile<karma::domain>(subject).what(context)); | |
93 | } | |
94 | ||
95 | Subject subject; | |
96 | }; | |
97 | ||
98 | /////////////////////////////////////////////////////////////////////////// | |
99 | // Generator generator: make_xxx function (objects) | |
100 | /////////////////////////////////////////////////////////////////////////// | |
101 | template <typename Expr, typename Exposed, typename Transformed | |
102 | , typename Modifiers> | |
103 | struct make_primitive< | |
104 | tag::stateful_tag<Expr, tag::attr_cast, Exposed, Transformed>, Modifiers> | |
105 | { | |
106 | typedef attr_cast_generator<Exposed, Transformed, Expr> result_type; | |
107 | ||
108 | template <typename Terminal> | |
109 | result_type operator()(Terminal const& term, unused_type) const | |
110 | { | |
111 | typedef tag::stateful_tag< | |
112 | Expr, tag::attr_cast, Exposed, Transformed> tag_type; | |
113 | using spirit::detail::get_stateful_data; | |
114 | return result_type(get_stateful_data<tag_type>::call(term)); | |
115 | } | |
116 | }; | |
117 | ||
118 | }}} | |
119 | ||
120 | #endif |