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1 | /*============================================================================= |
2 | Copyright (c) 2001-2011 Joel de Guzman | |
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 | ==============================================================================*/ | |
7 | #if !defined(BOOST_SPIRIT_RULE_FEBRUARY_12_2007_1020AM) | |
8 | #define BOOST_SPIRIT_RULE_FEBRUARY_12_2007_1020AM | |
9 | ||
10 | #if defined(_MSC_VER) | |
11 | #pragma once | |
12 | #endif | |
13 | ||
14 | #include <boost/assert.hpp> | |
15 | #include <boost/config.hpp> | |
16 | #include <boost/function.hpp> | |
17 | #include <boost/mpl/vector.hpp> | |
18 | #include <boost/type_traits/add_reference.hpp> | |
19 | #include <boost/type_traits/is_same.hpp> | |
20 | ||
21 | #include <boost/fusion/include/vector.hpp> | |
22 | #include <boost/fusion/include/size.hpp> | |
23 | #include <boost/fusion/include/make_vector.hpp> | |
24 | #include <boost/fusion/include/cons.hpp> | |
25 | #include <boost/fusion/include/as_list.hpp> | |
26 | #include <boost/fusion/include/as_vector.hpp> | |
27 | ||
28 | #include <boost/spirit/home/support/unused.hpp> | |
29 | #include <boost/spirit/home/support/argument.hpp> | |
30 | #include <boost/spirit/home/support/context.hpp> | |
31 | #include <boost/spirit/home/support/info.hpp> | |
32 | #include <boost/spirit/home/qi/detail/attributes.hpp> | |
33 | #include <boost/spirit/home/support/nonterminal/extract_param.hpp> | |
34 | #include <boost/spirit/home/support/nonterminal/locals.hpp> | |
35 | #include <boost/spirit/home/qi/reference.hpp> | |
36 | #include <boost/spirit/home/qi/nonterminal/detail/parameterized.hpp> | |
37 | #include <boost/spirit/home/qi/nonterminal/detail/parser_binder.hpp> | |
38 | #include <boost/spirit/home/qi/nonterminal/nonterminal_fwd.hpp> | |
39 | #include <boost/spirit/home/qi/skip_over.hpp> | |
40 | ||
41 | #if defined(BOOST_MSVC) | |
42 | # pragma warning(push) | |
43 | # pragma warning(disable: 4355) // 'this' : used in base member initializer list warning | |
44 | # pragma warning(disable: 4127) // conditional expression is constant | |
45 | #endif | |
46 | ||
47 | namespace boost { namespace spirit { namespace qi | |
48 | { | |
49 | BOOST_PP_REPEAT(SPIRIT_ATTRIBUTES_LIMIT, SPIRIT_USING_ATTRIBUTE, _) | |
50 | ||
51 | using spirit::_pass_type; | |
52 | using spirit::_val_type; | |
53 | using spirit::_a_type; | |
54 | using spirit::_b_type; | |
55 | using spirit::_c_type; | |
56 | using spirit::_d_type; | |
57 | using spirit::_e_type; | |
58 | using spirit::_f_type; | |
59 | using spirit::_g_type; | |
60 | using spirit::_h_type; | |
61 | using spirit::_i_type; | |
62 | using spirit::_j_type; | |
63 | ||
64 | #ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS | |
65 | ||
66 | using spirit::_pass; | |
67 | using spirit::_val; | |
68 | using spirit::_a; | |
69 | using spirit::_b; | |
70 | using spirit::_c; | |
71 | using spirit::_d; | |
72 | using spirit::_e; | |
73 | using spirit::_f; | |
74 | using spirit::_g; | |
75 | using spirit::_h; | |
76 | using spirit::_i; | |
77 | using spirit::_j; | |
78 | ||
79 | #endif | |
80 | ||
81 | using spirit::info; | |
82 | using spirit::locals; | |
83 | ||
84 | template < | |
85 | typename Iterator, typename T1, typename T2, typename T3 | |
86 | , typename T4> | |
87 | struct rule | |
88 | : proto::extends< | |
89 | typename proto::terminal< | |
90 | reference<rule<Iterator, T1, T2, T3, T4> const> | |
91 | >::type | |
92 | , rule<Iterator, T1, T2, T3, T4> | |
93 | > | |
94 | , parser<rule<Iterator, T1, T2, T3, T4> > | |
95 | { | |
96 | typedef Iterator iterator_type; | |
97 | typedef rule<Iterator, T1, T2, T3, T4> this_type; | |
98 | typedef reference<this_type const> reference_; | |
99 | typedef typename proto::terminal<reference_>::type terminal; | |
100 | typedef proto::extends<terminal, this_type> base_type; | |
101 | typedef mpl::vector<T1, T2, T3, T4> template_params; | |
102 | ||
103 | // The rule's locals_type: a sequence of types to be used as local variables | |
104 | typedef typename | |
105 | spirit::detail::extract_locals<template_params>::type | |
106 | locals_type; | |
107 | ||
108 | // The rule's skip-parser type | |
109 | typedef typename | |
110 | spirit::detail::extract_component< | |
111 | qi::domain, template_params>::type | |
112 | skipper_type; | |
113 | ||
114 | // The rule's encoding type | |
115 | typedef typename | |
116 | spirit::detail::extract_encoding<template_params>::type | |
117 | encoding_type; | |
118 | ||
119 | // The rule's signature | |
120 | typedef typename | |
121 | spirit::detail::extract_sig<template_params, encoding_type, qi::domain>::type | |
122 | sig_type; | |
123 | ||
124 | // This is the rule's attribute type | |
125 | typedef typename | |
126 | spirit::detail::attr_from_sig<sig_type>::type | |
127 | attr_type; | |
128 | typedef typename add_reference<attr_type>::type attr_reference_type; | |
129 | ||
130 | // parameter_types is a sequence of types passed as parameters to the rule | |
131 | typedef typename | |
132 | spirit::detail::params_from_sig<sig_type>::type | |
133 | parameter_types; | |
134 | ||
135 | static size_t const params_size = | |
136 | fusion::result_of::size<parameter_types>::type::value; | |
137 | ||
138 | typedef context< | |
139 | fusion::cons<attr_reference_type, parameter_types> | |
140 | , locals_type> | |
141 | context_type; | |
142 | ||
143 | typedef function< | |
144 | bool(Iterator& first, Iterator const& last | |
145 | , context_type& context | |
146 | , skipper_type const& skipper | |
147 | )> | |
148 | function_type; | |
149 | ||
150 | typedef typename | |
151 | mpl::if_< | |
152 | is_same<encoding_type, unused_type> | |
153 | , unused_type | |
154 | , tag::char_code<tag::encoding, encoding_type> | |
155 | >::type | |
156 | encoding_modifier_type; | |
157 | ||
158 | explicit rule(std::string const& name = "unnamed-rule") | |
159 | : base_type(terminal::make(reference_(*this))) | |
160 | , name_(name) | |
161 | { | |
162 | } | |
163 | ||
164 | rule(rule const& rhs) | |
165 | : base_type(terminal::make(reference_(*this))) | |
166 | , name_(rhs.name_) | |
167 | , f(rhs.f) | |
168 | { | |
169 | } | |
170 | ||
171 | template <typename Auto, typename Expr> | |
172 | static void define(rule& /*lhs*/, Expr const& /*expr*/, mpl::false_) | |
173 | { | |
174 | // Report invalid expression error as early as possible. | |
175 | // If you got an error_invalid_expression error message here, | |
176 | // then the expression (expr) is not a valid spirit qi expression. | |
177 | BOOST_SPIRIT_ASSERT_MATCH(qi::domain, Expr); | |
178 | } | |
179 | ||
180 | template <typename Auto, typename Expr> | |
181 | static void define(rule& lhs, Expr const& expr, mpl::true_) | |
182 | { | |
183 | lhs.f = detail::bind_parser<Auto>( | |
184 | compile<qi::domain>(expr, encoding_modifier_type())); | |
185 | } | |
186 | ||
187 | template <typename Expr> | |
188 | rule(Expr const& expr, std::string const& name = "unnamed-rule") | |
189 | : base_type(terminal::make(reference_(*this))) | |
190 | , name_(name) | |
191 | { | |
192 | define<mpl::false_>(*this, expr, traits::matches<qi::domain, Expr>()); | |
193 | } | |
194 | ||
195 | rule& operator=(rule const& rhs) | |
196 | { | |
197 | // The following assertion fires when you try to initialize a rule | |
198 | // from an uninitialized one. Did you mean to refer to the right | |
199 | // hand side rule instead of assigning from it? In this case you | |
200 | // should write lhs = rhs.alias(); | |
201 | BOOST_ASSERT(rhs.f && "Did you mean rhs.alias() instead of rhs?"); | |
202 | ||
203 | f = rhs.f; | |
204 | name_ = rhs.name_; | |
205 | return *this; | |
206 | } | |
207 | ||
208 | std::string const& name() const | |
209 | { | |
210 | return name_; | |
211 | } | |
212 | ||
213 | void name(std::string const& str) | |
214 | { | |
215 | name_ = str; | |
216 | } | |
217 | ||
218 | template <typename Expr> | |
219 | rule& operator=(Expr const& expr) | |
220 | { | |
221 | define<mpl::false_>(*this, expr, traits::matches<qi::domain, Expr>()); | |
222 | return *this; | |
223 | } | |
224 | ||
225 | // VC7.1 has problems to resolve 'rule' without explicit template parameters | |
226 | #if !BOOST_WORKAROUND(BOOST_MSVC, < 1400) | |
227 | // g++ 3.3 barfs if this is a member function :( | |
228 | template <typename Expr> | |
229 | friend rule& operator%=(rule& r, Expr const& expr) | |
230 | { | |
231 | define<mpl::true_>(r, expr, traits::matches<qi::domain, Expr>()); | |
232 | return r; | |
233 | } | |
234 | ||
235 | #if defined(BOOST_NO_CXX11_RVALUE_REFERENCES) | |
236 | // non-const version needed to suppress proto's %= kicking in | |
237 | template <typename Expr> | |
238 | friend rule& operator%=(rule& r, Expr& expr) | |
239 | { | |
240 | return r %= static_cast<Expr const&>(expr); | |
241 | } | |
242 | #else | |
243 | // for rvalue references | |
244 | template <typename Expr> | |
245 | friend rule& operator%=(rule& r, Expr&& expr) | |
246 | { | |
247 | define<mpl::true_>(r, expr, traits::matches<qi::domain, Expr>()); | |
248 | return r; | |
249 | } | |
250 | #endif | |
251 | ||
252 | #else | |
253 | // both friend functions have to be defined out of class as VC7.1 | |
254 | // will complain otherwise | |
255 | template <typename OutputIterator_, typename T1_, typename T2_ | |
256 | , typename T3_, typename T4_, typename Expr> | |
257 | friend rule<OutputIterator_, T1_, T2_, T3_, T4_>& operator%=( | |
258 | rule<OutputIterator_, T1_, T2_, T3_, T4_>& r, Expr const& expr); | |
259 | ||
260 | // non-const version needed to suppress proto's %= kicking in | |
261 | template <typename OutputIterator_, typename T1_, typename T2_ | |
262 | , typename T3_, typename T4_, typename Expr> | |
263 | friend rule<OutputIterator_, T1_, T2_, T3_, T4_>& operator%=( | |
264 | rule<OutputIterator_, T1_, T2_, T3_, T4_>& r, Expr& expr); | |
265 | #endif | |
266 | ||
267 | template <typename Context, typename Iterator_> | |
268 | struct attribute | |
269 | { | |
270 | typedef attr_type type; | |
271 | }; | |
272 | ||
273 | template <typename Context, typename Skipper, typename Attribute> | |
274 | bool parse(Iterator& first, Iterator const& last | |
275 | , Context& /*context*/, Skipper const& skipper | |
276 | , Attribute& attr_param) const | |
277 | { | |
278 | if (f) | |
279 | { | |
280 | // do a preskip if this is an implied lexeme | |
281 | if (is_same<skipper_type, unused_type>::value) | |
282 | qi::skip_over(first, last, skipper); | |
283 | ||
284 | typedef traits::make_attribute<attr_type, Attribute> make_attribute; | |
285 | ||
286 | // do down-stream transformation, provides attribute for | |
287 | // rhs parser | |
288 | typedef traits::transform_attribute< | |
289 | typename make_attribute::type, attr_type, domain> | |
290 | transform; | |
291 | ||
292 | typename make_attribute::type made_attr = make_attribute::call(attr_param); | |
293 | typename transform::type attr_ = transform::pre(made_attr); | |
294 | ||
295 | // If you are seeing a compilation error here, you are probably | |
296 | // trying to use a rule or a grammar which has inherited | |
297 | // attributes, without passing values for them. | |
298 | context_type context(attr_); | |
299 | ||
300 | // If you are seeing a compilation error here stating that the | |
301 | // fourth parameter can't be converted to a required target type | |
302 | // then you are probably trying to use a rule or a grammar with | |
303 | // an incompatible skipper type. | |
304 | if (f(first, last, context, skipper)) | |
305 | { | |
306 | // do up-stream transformation, this integrates the results | |
307 | // back into the original attribute value, if appropriate | |
308 | traits::post_transform(attr_param, attr_); | |
309 | return true; | |
310 | } | |
311 | ||
312 | // inform attribute transformation of failed rhs | |
313 | traits::fail_transform(attr_param, attr_); | |
314 | } | |
315 | return false; | |
316 | } | |
317 | ||
318 | template <typename Context, typename Skipper | |
319 | , typename Attribute, typename Params> | |
320 | bool parse(Iterator& first, Iterator const& last | |
321 | , Context& caller_context, Skipper const& skipper | |
322 | , Attribute& attr_param, Params const& params) const | |
323 | { | |
324 | if (f) | |
325 | { | |
326 | // do a preskip if this is an implied lexeme | |
327 | if (is_same<skipper_type, unused_type>::value) | |
328 | qi::skip_over(first, last, skipper); | |
329 | ||
330 | typedef traits::make_attribute<attr_type, Attribute> make_attribute; | |
331 | ||
332 | // do down-stream transformation, provides attribute for | |
333 | // rhs parser | |
334 | typedef traits::transform_attribute< | |
335 | typename make_attribute::type, attr_type, domain> | |
336 | transform; | |
337 | ||
338 | typename make_attribute::type made_attr = make_attribute::call(attr_param); | |
339 | typename transform::type attr_ = transform::pre(made_attr); | |
340 | ||
341 | // If you are seeing a compilation error here, you are probably | |
342 | // trying to use a rule or a grammar which has inherited | |
343 | // attributes, passing values of incompatible types for them. | |
344 | context_type context(attr_, params, caller_context); | |
345 | ||
346 | // If you are seeing a compilation error here stating that the | |
347 | // fourth parameter can't be converted to a required target type | |
348 | // then you are probably trying to use a rule or a grammar with | |
349 | // an incompatible skipper type. | |
350 | if (f(first, last, context, skipper)) | |
351 | { | |
352 | // do up-stream transformation, this integrates the results | |
353 | // back into the original attribute value, if appropriate | |
354 | traits::post_transform(attr_param, attr_); | |
355 | return true; | |
356 | } | |
357 | ||
358 | // inform attribute transformation of failed rhs | |
359 | traits::fail_transform(attr_param, attr_); | |
360 | } | |
361 | return false; | |
362 | } | |
363 | ||
364 | template <typename Context> | |
365 | info what(Context& /*context*/) const | |
366 | { | |
367 | return info(name_); | |
368 | } | |
369 | ||
370 | reference_ alias() const | |
371 | { | |
372 | return reference_(*this); | |
373 | } | |
374 | ||
375 | typename proto::terminal<this_type>::type copy() const | |
376 | { | |
377 | typename proto::terminal<this_type>::type result = {*this}; | |
378 | return result; | |
379 | } | |
380 | ||
381 | // bring in the operator() overloads | |
382 | rule const& get_parameterized_subject() const { return *this; } | |
383 | typedef rule parameterized_subject_type; | |
384 | #include <boost/spirit/home/qi/nonterminal/detail/fcall.hpp> | |
385 | ||
386 | std::string name_; | |
387 | function_type f; | |
388 | }; | |
389 | ||
390 | #if BOOST_WORKAROUND(BOOST_MSVC, < 1400) | |
391 | template <typename OutputIterator_, typename T1_, typename T2_ | |
392 | , typename T3_, typename T4_, typename Expr> | |
393 | rule<OutputIterator_, T1_, T2_, T3_, T4_>& operator%=( | |
394 | rule<OutputIterator_, T1_, T2_, T3_, T4_>& r, Expr const& expr) | |
395 | { | |
396 | // Report invalid expression error as early as possible. | |
397 | // If you got an error_invalid_expression error message here, | |
398 | // then the expression (expr) is not a valid spirit qi expression. | |
399 | BOOST_SPIRIT_ASSERT_MATCH(qi::domain, Expr); | |
400 | ||
401 | typedef typename | |
402 | rule<OutputIterator_, T1_, T2_, T3_, T4_>::encoding_modifier_type | |
403 | encoding_modifier_type; | |
404 | ||
405 | r.f = detail::bind_parser<mpl::true_>( | |
406 | compile<qi::domain>(expr, encoding_modifier_type())); | |
407 | return r; | |
408 | } | |
409 | ||
410 | template <typename Iterator_, typename T1_, typename T2_ | |
411 | , typename T3_, typename T4_, typename Expr> | |
412 | rule<Iterator_, T1_, T2_, T3_, T4_>& operator%=( | |
413 | rule<Iterator_, T1_, T2_, T3_, T4_>& r, Expr& expr) | |
414 | { | |
415 | return r %= static_cast<Expr const&>(expr); | |
416 | } | |
417 | #endif | |
418 | }}} | |
419 | ||
420 | namespace boost { namespace spirit { namespace traits | |
421 | { | |
422 | /////////////////////////////////////////////////////////////////////////// | |
423 | template < | |
424 | typename IteratorA, typename IteratorB, typename Attribute | |
425 | , typename Context, typename T1, typename T2, typename T3, typename T4> | |
426 | struct handles_container< | |
427 | qi::rule<IteratorA, T1, T2, T3, T4>, Attribute, Context, IteratorB> | |
428 | : traits::is_container< | |
429 | typename attribute_of< | |
430 | qi::rule<IteratorA, T1, T2, T3, T4>, Context, IteratorB | |
431 | >::type | |
432 | > | |
433 | {}; | |
434 | }}} | |
435 | ||
436 | #if defined(BOOST_MSVC) | |
437 | # pragma warning(pop) | |
438 | #endif | |
439 | ||
440 | #endif |