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[ceph.git] / ceph / src / boost / libs / spirit / include / boost / spirit / home / classic / dynamic / select.hpp
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FG		 1/*=============================================================================
2 Copyright (c) 2003 Hartmut Kaiser
3 http://spirit.sourceforge.net/
4
5 Distributed under the Boost Software License, Version 1.0. (See accompanying
6 file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
7=============================================================================*/
8#ifndef BOOST_SPIRIT_SELECT_HPP
9#define BOOST_SPIRIT_SELECT_HPP
10
11#include <boost/preprocessor/repeat.hpp>
12#include <boost/preprocessor/enum.hpp>
13#include <boost/preprocessor/enum_params.hpp>
14#include <boost/preprocessor/enum_params_with_defaults.hpp>
15#include <boost/preprocessor/inc.hpp>
16#include <boost/preprocessor/cat.hpp>
17#include <boost/preprocessor/facilities/intercept.hpp>
18
19#include <boost/spirit/home/classic/namespace.hpp>
20#include <boost/spirit/home/classic/core/parser.hpp>
21
22#include <boost/spirit/home/classic/phoenix/tuples.hpp>
23
24///////////////////////////////////////////////////////////////////////////////
25//
26// Spirit predefined maximum number of possible embedded select_p parsers.
27// It should NOT be greater than PHOENIX_LIMIT!
28//
29///////////////////////////////////////////////////////////////////////////////
30#if !defined(BOOST_SPIRIT_SELECT_LIMIT)
31#define BOOST_SPIRIT_SELECT_LIMIT PHOENIX_LIMIT
32#endif // !defined(BOOST_SPIRIT_SELECT_LIMIT)
33
34///////////////////////////////////////////////////////////////////////////////
35//
36// ensure BOOST_SPIRIT_SELECT_LIMIT <= PHOENIX_LIMIT and
37// BOOST_SPIRIT_SELECT_LIMIT > 0
38// BOOST_SPIRIT_SELECT_LIMIT <= 15
39//
40// [Pushed this down a little to make CW happy with BOOST_STATIC_ASSERT]
41// [Otherwise, it complains: 'boost_static_assert_test_42' redefined]
42//
43///////////////////////////////////////////////////////////////////////////////
44BOOST_STATIC_ASSERT(BOOST_SPIRIT_SELECT_LIMIT <= PHOENIX_LIMIT);
45BOOST_STATIC_ASSERT(BOOST_SPIRIT_SELECT_LIMIT > 0);
46BOOST_STATIC_ASSERT(BOOST_SPIRIT_SELECT_LIMIT <= 15);
47
48///////////////////////////////////////////////////////////////////////////////
49//
50// Calculate the required amount of tuple members rounded up to the nearest
51// integer dividable by 3
52//
53///////////////////////////////////////////////////////////////////////////////
54#if BOOST_SPIRIT_SELECT_LIMIT > 12
55#define BOOST_SPIRIT_SELECT_LIMIT_A 15
56#elif BOOST_SPIRIT_SELECT_LIMIT > 9
57#define BOOST_SPIRIT_SELECT_LIMIT_A 12
58#elif BOOST_SPIRIT_SELECT_LIMIT > 6
59#define BOOST_SPIRIT_SELECT_LIMIT_A 9
60#elif BOOST_SPIRIT_SELECT_LIMIT > 3
61#define BOOST_SPIRIT_SELECT_LIMIT_A 6
62#else
63#define BOOST_SPIRIT_SELECT_LIMIT_A 3
64#endif
65
66///////////////////////////////////////////////////////////////////////////////
67namespace boost { namespace spirit {
68
69BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
70
71///////////////////////////////////////////////////////////////////////////////
72//
73// The select_default_no_fail and select_default_fail structs are used to
74// distinguish two different behaviours for the select_parser in case that not
75// any of the given sub-parsers match.
76//
77// If the select_parser is used with the select_default_no_fail behaviour,
78// then in case of no matching sub-parser the whole select_parser returns an
79// empty match and the value -1.
80//
81// If the select_parser is used with the select_default_fail behaviour, then
82// in case of no matching sub-parser the whole select_parser fails to match at
83// all.
84//
85///////////////////////////////////////////////////////////////////////////////
86struct select_default_no_fail {};
87struct select_default_fail {};
88
89BOOST_SPIRIT_CLASSIC_NAMESPACE_END
90
91}} // namespace BOOST_SPIRIT_CLASSIC_NS
92
93///////////////////////////////////////////////////////////////////////////////
94#include <boost/spirit/home/classic/dynamic/impl/select.ipp>
95
96///////////////////////////////////////////////////////////////////////////////
97namespace boost { namespace spirit {
98
99BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN
100
101///////////////////////////////////////////////////////////////////////////////
102template <typename TupleT, typename BehaviourT, typename T>
103struct select_parser
104: public parser<select_parser<TupleT, BehaviourT, T> >
105{
106 typedef select_parser<TupleT, BehaviourT, T> self_t;
107
108 select_parser(TupleT const &t_)
109 : t(t_)
110 {}
111
112 template <typename ScannerT>
113 struct result
114 {
115 typedef typename match_result<ScannerT, T>::type type;
116 };
117
118 template <typename ScannerT>
119 typename parser_result<self_t, ScannerT>::type
120 parse(ScannerT const& scan) const
121 {
122 typedef typename parser_result<self_t, ScannerT>::type result_t;
123
124 if (!scan.at_end()) {
125 return impl::parse_tuple_element<
126 TupleT::length, result_t, TupleT, BehaviourT>::do_(t, scan);
127 }
128 return impl::select_match_gen<result_t, BehaviourT>::do_(scan);
129 }
130
131 TupleT const t;
132};
133
134///////////////////////////////////////////////////////////////////////////////
135template <typename BehaviourT, typename T = int>
136struct select_parser_gen {
137
138 ///////////////////////////////////////////////////////////////////////////
139 //
140 // This generates different select_parser_gen::operator()() functions with
141 // an increasing number of parser parameters:
142 //
143 // template <typename ParserT0, ...>
144 // select_parser<
145 // ::phoenix::tuple<
146 // typename impl::as_embedded_parser<ParserT0>::type,
147 // ...
148 // >,
149 // BehaviourT,
150 // T
151 // >
152 // operator()(ParserT0 const &p0, ...) const
153 // {
154 // typedef impl::as_embedded_parser<ParserT0> parser_t0;
155 // ...
156 //
157 // typedef ::phoenix::tuple<
158 // parser_t0::type,
159 // ...
160 // > tuple_t;
161 // typedef select_parser<tuple_t, BehaviourT, T> result_t;
162 //
163 // return result_t(tuple_t(
164 // parser_t0::convert(p0),
165 // ...
166 // ));
167 // }
168 //
169 // The number of generated functions depends on the maximum tuple member
170 // limit defined by the PHOENIX_LIMIT pp constant.
171 //
172 ///////////////////////////////////////////////////////////////////////////
173 #define BOOST_SPIRIT_SELECT_EMBEDDED(z, N, _) \
174 typename impl::as_embedded_parser<BOOST_PP_CAT(ParserT, N)>::type \
175 /**/
176 #define BOOST_SPIRIT_SELECT_EMBEDDED_TYPEDEF(z, N, _) \
177 typedef impl::as_embedded_parser<BOOST_PP_CAT(ParserT, N)> \
178 BOOST_PP_CAT(parser_t, N); \
179 /**/
180 #define BOOST_SPIRIT_SELECT_CONVERT(z, N, _) \
181 BOOST_PP_CAT(parser_t, N)::convert(BOOST_PP_CAT(p, N)) \
182 /**/
183
184 #define BOOST_SPIRIT_SELECT_PARSER(z, N, _) \
185 template < \
186 BOOST_PP_ENUM_PARAMS_Z(z, BOOST_PP_INC(N), typename ParserT) \
187 > \
188 select_parser< \
189 ::phoenix::tuple< \
190 BOOST_PP_ENUM_ ## z(BOOST_PP_INC(N), \
191 BOOST_SPIRIT_SELECT_EMBEDDED, _) \
192 >, \
193 BehaviourT, \
194 T \
195 > \
196 operator()( \
197 BOOST_PP_ENUM_BINARY_PARAMS_Z(z, BOOST_PP_INC(N), \
198 ParserT, const &p) \
199 ) const \
200 { \
201 BOOST_PP_REPEAT_ ## z(BOOST_PP_INC(N), \
202 BOOST_SPIRIT_SELECT_EMBEDDED_TYPEDEF, _) \
203 \
204 typedef ::phoenix::tuple< \
205 BOOST_PP_ENUM_BINARY_PARAMS_Z(z, BOOST_PP_INC(N), \
206 typename parser_t, ::type BOOST_PP_INTERCEPT) \
207 > tuple_t; \
208 typedef select_parser<tuple_t, BehaviourT, T> result_t; \
209 \
210 return result_t(tuple_t( \
211 BOOST_PP_ENUM_ ## z(BOOST_PP_INC(N), \
212 BOOST_SPIRIT_SELECT_CONVERT, _) \
213 )); \
214 } \
215 /**/
216
217 BOOST_PP_REPEAT(BOOST_SPIRIT_SELECT_LIMIT_A,
218 BOOST_SPIRIT_SELECT_PARSER, _)
219
220 #undef BOOST_SPIRIT_SELECT_PARSER
221 #undef BOOST_SPIRIT_SELECT_CONVERT
222 #undef BOOST_SPIRIT_SELECT_EMBEDDED_TYPEDEF
223 #undef BOOST_SPIRIT_SELECT_EMBEDDED
224 ///////////////////////////////////////////////////////////////////////////
225};
226
227///////////////////////////////////////////////////////////////////////////////
228//
229// Predefined parser generator helper objects
230//
231///////////////////////////////////////////////////////////////////////////////
232select_parser_gen<select_default_no_fail> const select_p =
233 select_parser_gen<select_default_no_fail>();
234
235select_parser_gen<select_default_fail> const select_fail_p =
236 select_parser_gen<select_default_fail>();
237
238#undef BOOST_SPIRIT_SELECT_LIMIT_A
239
240///////////////////////////////////////////////////////////////////////////////
241BOOST_SPIRIT_CLASSIC_NAMESPACE_END
242
243}} // namespace BOOST_SPIRIT_CLASSIC_NS
244
245#endif // BOOST_SPIRIT_SELECT_HPP
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