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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(BOOST_SPIRIT_KARMA_PADDING_MAY_06_2008_0436PM) | |
7 | #define BOOST_SPIRIT_KARMA_PADDING_MAY_06_2008_0436PM | |
8 | ||
9 | #if defined(_MSC_VER) | |
10 | #pragma once | |
11 | #endif | |
12 | ||
13 | #include <boost/spirit/home/support/common_terminals.hpp> | |
14 | #include <boost/spirit/home/support/info.hpp> | |
15 | ||
16 | #include <boost/spirit/home/karma/domain.hpp> | |
17 | #include <boost/spirit/home/karma/meta_compiler.hpp> | |
18 | #include <boost/spirit/home/karma/delimit_out.hpp> | |
19 | #include <boost/spirit/home/karma/auxiliary/lazy.hpp> | |
20 | #include <boost/spirit/home/karma/detail/generate_to.hpp> | |
21 | #include <boost/spirit/home/support/unused.hpp> | |
22 | #include <boost/fusion/include/at.hpp> | |
23 | #include <boost/fusion/include/vector.hpp> | |
24 | ||
25 | /////////////////////////////////////////////////////////////////////////////// | |
26 | namespace boost { namespace spirit | |
27 | { | |
28 | /////////////////////////////////////////////////////////////////////////// | |
29 | // Enablers | |
30 | /////////////////////////////////////////////////////////////////////////// | |
31 | ||
32 | // enables pad(...) | |
33 | template <typename A0> | |
34 | struct use_terminal<karma::domain | |
35 | , terminal_ex<tag::pad, fusion::vector1<A0> > > | |
36 | : mpl::true_ {}; | |
37 | ||
38 | // enables lazy pad(...) | |
39 | template <> | |
40 | struct use_lazy_terminal<karma::domain, tag::pad, 1> | |
41 | : mpl::true_ {}; | |
42 | ||
43 | }} | |
44 | ||
45 | /////////////////////////////////////////////////////////////////////////////// | |
46 | namespace boost { namespace spirit { namespace karma | |
47 | { | |
48 | #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS | |
49 | using boost::spirit::pad; | |
50 | #endif | |
51 | using boost::spirit::pad_type; | |
52 | ||
53 | struct binary_padding_generator | |
54 | : primitive_generator<binary_padding_generator> | |
55 | { | |
56 | typedef mpl::int_<generator_properties::tracking> properties; | |
57 | ||
58 | template <typename Context, typename Unused> | |
59 | struct attribute | |
60 | { | |
61 | typedef unused_type type; | |
62 | }; | |
63 | ||
64 | binary_padding_generator(int numpadbytes) | |
65 | : numpadbytes_(numpadbytes) | |
66 | {} | |
67 | ||
68 | template < | |
69 | typename OutputIterator, typename Context, typename Delimiter | |
70 | , typename Attribute> | |
71 | bool generate(OutputIterator& sink, Context&, Delimiter const& d | |
72 | , Attribute const& /*attr*/) const | |
73 | { | |
74 | std::size_t count = sink.get_out_count() % numpadbytes_; | |
75 | if (count) | |
76 | count = numpadbytes_ - count; | |
77 | ||
78 | bool result = true; | |
79 | while (result && count-- != 0) | |
80 | result = detail::generate_to(sink, '\0'); | |
81 | ||
82 | if (result) | |
83 | result = karma::delimit_out(sink, d); // always do post-delimiting | |
84 | return result; | |
85 | } | |
86 | ||
87 | template <typename Context> | |
88 | static info what(Context const&) | |
89 | { | |
90 | return info("pad"); | |
91 | } | |
92 | ||
93 | int numpadbytes_; | |
94 | }; | |
95 | ||
96 | /////////////////////////////////////////////////////////////////////////// | |
97 | // Generator generators: make_xxx function (objects) | |
98 | /////////////////////////////////////////////////////////////////////////// | |
99 | template <typename Modifiers, typename A0> | |
100 | struct make_primitive< | |
101 | terminal_ex<tag::pad, fusion::vector1<A0> > | |
102 | , Modifiers> | |
103 | { | |
104 | typedef binary_padding_generator result_type; | |
105 | ||
106 | template <typename Terminal> | |
107 | result_type operator()(Terminal const& term, unused_type) const | |
108 | { | |
109 | return result_type(fusion::at_c<0>(term.args)); | |
110 | } | |
111 | }; | |
112 | ||
113 | }}} | |
114 | ||
115 | #endif |