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1 | /*============================================================================= | |
2 | Copyright (c) 2001-2011 Hartmut Kaiser | |
3 | Copyright (c) 2011 Bryce Lelbach | |
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 | #if !defined(SPIRIT_QI_BOOL_SEP_29_2009_0709AM) | |
9 | #define SPIRIT_QI_BOOL_SEP_29_2009_0709AM | |
10 | ||
11 | #if defined(_MSC_VER) | |
12 | #pragma once | |
13 | #endif | |
14 | ||
15 | #include <boost/spirit/home/qi/skip_over.hpp> | |
16 | #include <boost/spirit/home/qi/detail/enable_lit.hpp> | |
17 | #include <boost/spirit/home/qi/meta_compiler.hpp> | |
18 | #include <boost/spirit/home/qi/parser.hpp> | |
19 | #include <boost/spirit/home/qi/numeric/bool_policies.hpp> | |
20 | #include <boost/spirit/home/support/common_terminals.hpp> | |
21 | #include <boost/mpl/assert.hpp> | |
22 | #include <boost/detail/workaround.hpp> | |
23 | #include <boost/type_traits/is_same.hpp> | |
24 | ||
25 | namespace boost { namespace spirit | |
26 | { | |
27 | namespace qi | |
28 | { | |
29 | /////////////////////////////////////////////////////////////////////// | |
30 | // forward declaration only | |
31 | template <typename T> | |
32 | struct bool_policies; | |
33 | ||
34 | /////////////////////////////////////////////////////////////////////// | |
35 | // This is the class that the user can instantiate directly in | |
36 | // order to create a customized bool parser | |
37 | template <typename T, typename BoolPolicies = bool_policies<T> > | |
38 | struct bool_parser | |
39 | : spirit::terminal<tag::stateful_tag<BoolPolicies, tag::bool_, T> > | |
40 | { | |
41 | typedef tag::stateful_tag<BoolPolicies, tag::bool_, T> tag_type; | |
42 | ||
43 | bool_parser() {} | |
44 | bool_parser(BoolPolicies const& data) | |
45 | : spirit::terminal<tag_type>(data) {} | |
46 | }; | |
47 | } | |
48 | ||
49 | /////////////////////////////////////////////////////////////////////////// | |
50 | // Enablers | |
51 | /////////////////////////////////////////////////////////////////////////// | |
52 | template <> // enables bool_ | |
53 | struct use_terminal<qi::domain, tag::bool_> | |
54 | : mpl::true_ {}; | |
55 | ||
56 | template <> // enables true_ | |
57 | struct use_terminal<qi::domain, tag::true_> | |
58 | : mpl::true_ {}; | |
59 | ||
60 | template <> // enables false_ | |
61 | struct use_terminal<qi::domain, tag::false_> | |
62 | : mpl::true_ {}; | |
63 | ||
64 | /////////////////////////////////////////////////////////////////////////// | |
65 | template <typename A0> // enables lit(...) | |
66 | struct use_terminal<qi::domain | |
67 | , terminal_ex<tag::lit, fusion::vector1<A0> > | |
68 | , typename enable_if<is_same<A0, bool> >::type> | |
69 | : mpl::true_ {}; | |
70 | ||
71 | /////////////////////////////////////////////////////////////////////////// | |
72 | template <typename A0> // enables bool_(...) | |
73 | struct use_terminal<qi::domain | |
74 | , terminal_ex<tag::bool_, fusion::vector1<A0> > | |
75 | > : mpl::true_ {}; | |
76 | ||
77 | template <> // enables *lazy* bool_(...) | |
78 | struct use_lazy_terminal<qi::domain, tag::bool_, 1> | |
79 | : mpl::true_ {}; | |
80 | ||
81 | /////////////////////////////////////////////////////////////////////////// | |
82 | // enables any custom bool_parser | |
83 | template <typename T, typename BoolPolicies> | |
84 | struct use_terminal<qi::domain | |
85 | , tag::stateful_tag<BoolPolicies, tag::bool_, T> > | |
86 | : mpl::true_ {}; | |
87 | ||
88 | // enables any custom bool_parser(...) | |
89 | template <typename T, typename BoolPolicies, typename A0> | |
90 | struct use_terminal<qi::domain | |
91 | , terminal_ex<tag::stateful_tag<BoolPolicies, tag::bool_, T> | |
92 | , fusion::vector1<A0> > > | |
93 | : mpl::true_ {}; | |
94 | ||
95 | // enables *lazy* custom bool_parser(...) | |
96 | template <typename T, typename BoolPolicies> | |
97 | struct use_lazy_terminal< | |
98 | qi::domain | |
99 | , tag::stateful_tag<BoolPolicies, tag::bool_, T> | |
100 | , 1 // arity | |
101 | > : mpl::true_ {}; | |
102 | }} | |
103 | ||
104 | namespace boost { namespace spirit { namespace qi | |
105 | { | |
106 | #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS | |
107 | using spirit::bool_; | |
108 | using spirit::true_; | |
109 | using spirit::false_; | |
110 | using spirit::lit; // lit(true) is equivalent to true | |
111 | #endif | |
112 | using spirit::bool_type; | |
113 | using spirit::true_type; | |
114 | using spirit::false_type; | |
115 | using spirit::lit_type; | |
116 | ||
117 | namespace detail | |
118 | { | |
119 | template <typename T, typename BoolPolicies> | |
120 | struct bool_impl | |
121 | { | |
122 | template <typename Iterator, typename Attribute> | |
123 | static bool parse(Iterator& first, Iterator const& last | |
124 | , Attribute& attr, BoolPolicies const& p, bool allow_true = true | |
125 | , bool disallow_false = false) | |
126 | { | |
127 | if (first == last) | |
128 | return false; | |
129 | ||
130 | #if BOOST_WORKAROUND(BOOST_MSVC, BOOST_TESTED_AT(1600)) | |
131 | p; // suppresses warning: C4100: 'p' : unreferenced formal parameter | |
132 | #endif | |
133 | return (allow_true && p.parse_true(first, last, attr)) || | |
134 | (!disallow_false && p.parse_false(first, last, attr)); | |
135 | } | |
136 | }; | |
137 | } | |
138 | ||
139 | /////////////////////////////////////////////////////////////////////////// | |
140 | // This actual boolean parser | |
141 | /////////////////////////////////////////////////////////////////////////// | |
142 | template <typename T, typename BoolPolicies = bool_policies<T> > | |
143 | struct any_bool_parser | |
144 | : primitive_parser<any_bool_parser<T, BoolPolicies> > | |
145 | { | |
146 | template <typename Context, typename Iterator> | |
147 | struct attribute | |
148 | { | |
149 | typedef T type; | |
150 | }; | |
151 | ||
152 | template <typename Iterator, typename Context | |
153 | , typename Skipper, typename Attribute> | |
154 | bool parse(Iterator& first, Iterator const& last | |
155 | , Context& /*context*/, Skipper const& skipper | |
156 | , Attribute& attr_) const | |
157 | { | |
158 | typedef detail::bool_impl<T, BoolPolicies> extract; | |
159 | qi::skip_over(first, last, skipper); | |
160 | return extract::parse(first, last, attr_, BoolPolicies()); | |
161 | } | |
162 | ||
163 | template <typename Context> | |
164 | info what(Context& /*context*/) const | |
165 | { | |
166 | return info("boolean"); | |
167 | } | |
168 | }; | |
169 | ||
170 | template <typename T, typename BoolPolicies = bool_policies<T> | |
171 | , bool no_attribute = true> | |
172 | struct literal_bool_parser | |
173 | : primitive_parser<literal_bool_parser<T, BoolPolicies, no_attribute> > | |
174 | { | |
175 | template <typename Value> | |
176 | literal_bool_parser(Value const& n) : n_(n) {} | |
177 | ||
178 | template <typename Context, typename Iterator> | |
179 | struct attribute | |
180 | : mpl::if_c<no_attribute, unused_type, T> | |
181 | {}; | |
182 | ||
183 | template <typename Iterator, typename Context | |
184 | , typename Skipper, typename Attribute> | |
185 | bool parse(Iterator& first, Iterator const& last | |
186 | , Context& /*context*/, Skipper const& skipper | |
187 | , Attribute& attr_) const | |
188 | { | |
189 | typedef detail::bool_impl<T, BoolPolicies> extract; | |
190 | qi::skip_over(first, last, skipper); | |
191 | return extract::parse(first, last, attr_, BoolPolicies(), n_, n_); | |
192 | } | |
193 | ||
194 | template <typename Context> | |
195 | info what(Context& /*context*/) const | |
196 | { | |
197 | return info("boolean"); | |
198 | } | |
199 | ||
200 | T n_; | |
201 | }; | |
202 | ||
203 | /////////////////////////////////////////////////////////////////////////// | |
204 | // Parser generators: make_xxx function (objects) | |
205 | /////////////////////////////////////////////////////////////////////////// | |
206 | template <typename T, typename Modifiers | |
207 | , typename Policies = bool_policies<T> > | |
208 | struct make_bool | |
209 | { | |
210 | typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> > | |
211 | no_case; | |
212 | ||
213 | typedef typename mpl::if_< | |
214 | mpl::and_< | |
215 | no_case | |
216 | , is_same<bool_policies<T>, Policies> | |
217 | > | |
218 | , any_bool_parser<T, no_case_bool_policies<T> > | |
219 | , any_bool_parser<T, Policies> >::type | |
220 | result_type; | |
221 | ||
222 | result_type operator()(unused_type, unused_type) const | |
223 | { | |
224 | return result_type(); | |
225 | } | |
226 | }; | |
227 | ||
228 | template <typename T, typename Modifiers | |
229 | , typename Policies = bool_policies<T> > | |
230 | struct make_direct_bool | |
231 | { | |
232 | typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> > | |
233 | no_case; | |
234 | ||
235 | typedef typename mpl::if_< | |
236 | mpl::and_< | |
237 | no_case | |
238 | , is_same<bool_policies<T>, Policies> | |
239 | > | |
240 | , literal_bool_parser<T, no_case_bool_policies<T>, false> | |
241 | , literal_bool_parser<T, Policies, false> >::type | |
242 | result_type; | |
243 | ||
244 | template <typename Terminal> | |
245 | result_type operator()(Terminal const& term, unused_type) const | |
246 | { | |
247 | return result_type(fusion::at_c<0>(term.args)); | |
248 | } | |
249 | }; | |
250 | ||
251 | template <typename T, typename Modifiers, bool b | |
252 | , typename Policies = bool_policies<T> > | |
253 | struct make_predefined_direct_bool | |
254 | { | |
255 | typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> > | |
256 | no_case; | |
257 | ||
258 | typedef typename mpl::if_< | |
259 | mpl::and_< | |
260 | no_case | |
261 | , is_same<bool_policies<T>, Policies> | |
262 | > | |
263 | , literal_bool_parser<T, no_case_bool_policies<T>, false> | |
264 | , literal_bool_parser<T, Policies, false> >::type | |
265 | result_type; | |
266 | ||
267 | result_type operator()(unused_type, unused_type) const | |
268 | { | |
269 | return result_type(b); | |
270 | } | |
271 | }; | |
272 | ||
273 | template <typename T, typename Modifiers | |
274 | , typename Policies = bool_policies<T> > | |
275 | struct make_literal_bool | |
276 | { | |
277 | typedef has_modifier<Modifiers, tag::char_code_base<tag::no_case> > | |
278 | no_case; | |
279 | ||
280 | typedef typename mpl::if_< | |
281 | mpl::and_< | |
282 | no_case | |
283 | , is_same<bool_policies<T>, Policies> | |
284 | > | |
285 | , literal_bool_parser<T, no_case_bool_policies<T> > | |
286 | , literal_bool_parser<T, Policies> >::type | |
287 | result_type; | |
288 | ||
289 | template <typename Terminal> | |
290 | result_type operator()(Terminal const& term, unused_type) const | |
291 | { | |
292 | return result_type(fusion::at_c<0>(term.args)); | |
293 | } | |
294 | }; | |
295 | ||
296 | /////////////////////////////////////////////////////////////////////////// | |
297 | template <typename Modifiers, typename A0> | |
298 | struct make_primitive< | |
299 | terminal_ex<tag::lit, fusion::vector1<A0> > | |
300 | , Modifiers, typename enable_if<is_same<A0, bool> >::type> | |
301 | : make_literal_bool<bool, Modifiers> {}; | |
302 | ||
303 | /////////////////////////////////////////////////////////////////////////// | |
304 | template <typename Modifiers> | |
305 | struct make_primitive<tag::false_, Modifiers> | |
306 | : make_predefined_direct_bool<bool, Modifiers, false> | |
307 | {}; | |
308 | ||
309 | template <typename Modifiers> | |
310 | struct make_primitive<tag::true_, Modifiers> | |
311 | : make_predefined_direct_bool<bool, Modifiers, true> | |
312 | {}; | |
313 | ||
314 | /////////////////////////////////////////////////////////////////////////// | |
315 | template <typename T, typename Policies, typename Modifiers> | |
316 | struct make_primitive< | |
317 | tag::stateful_tag<Policies, tag::bool_, T>, Modifiers> | |
318 | : make_bool<T, Modifiers, Policies> {}; | |
319 | ||
320 | template <typename T, typename Policies, typename A0, typename Modifiers> | |
321 | struct make_primitive< | |
322 | terminal_ex<tag::stateful_tag<Policies, tag::bool_, T> | |
323 | , fusion::vector1<A0> >, Modifiers> | |
324 | : make_direct_bool<T, Modifiers, Policies> {}; | |
325 | ||
326 | /////////////////////////////////////////////////////////////////////////// | |
327 | template <typename Modifiers> | |
328 | struct make_primitive<tag::bool_, Modifiers> | |
329 | : make_bool<bool, Modifiers> {}; | |
330 | ||
331 | template <typename Modifiers, typename A0> | |
332 | struct make_primitive< | |
333 | terminal_ex<tag::bool_ | |
334 | , fusion::vector1<A0> >, Modifiers> | |
335 | : make_direct_bool<bool, Modifiers> {}; | |
336 | }}} | |
337 | ||
338 | #endif |