1 /*=============================================================================
2 Copyright (c) 2001-2014 Joel de Guzman
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(SPIRIT_SEQUENCE_DETAIL_JAN_06_2013_1015AM)
8 #define SPIRIT_SEQUENCE_DETAIL_JAN_06_2013_1015AM
10 #include <boost/spirit/home/x3/support/traits/attribute_of.hpp>
11 #include <boost/spirit/home/x3/support/traits/attribute_category.hpp>
12 #include <boost/spirit/home/x3/support/traits/make_attribute.hpp>
13 #include <boost/spirit/home/x3/support/traits/has_attribute.hpp>
14 #include <boost/spirit/home/x3/support/traits/is_substitute.hpp>
15 #include <boost/spirit/home/x3/support/traits/container_traits.hpp>
16 #include <boost/spirit/home/x3/core/detail/parse_into_container.hpp>
18 #include <boost/fusion/include/begin.hpp>
19 #include <boost/fusion/include/end.hpp>
20 #include <boost/fusion/include/advance.hpp>
21 #include <boost/fusion/include/empty.hpp>
22 #include <boost/fusion/include/front.hpp>
23 #include <boost/fusion/include/iterator_range.hpp>
24 #include <boost/fusion/include/as_deque.hpp>
25 #include <boost/fusion/include/mpl.hpp>
27 #include <boost/mpl/copy_if.hpp>
28 #include <boost/mpl/not.hpp>
29 #include <boost/mpl/if.hpp>
30 #include <boost/mpl/insert_range.hpp>
31 #include <boost/mpl/eval_if.hpp>
32 #include <boost/mpl/vector.hpp>
33 #include <boost/mpl/identity.hpp>
35 #include <boost/type_traits/add_reference.hpp>
36 #include <boost/type_traits/is_same.hpp>
38 namespace boost { namespace spirit { namespace x3
40 template <typename Left, typename Right>
44 namespace boost { namespace spirit { namespace x3 { namespace detail
46 template <typename Parser, typename Context, typename Enable = void>
49 static int const value = traits::has_attribute<Parser, Context>::value;
52 template <typename Parser, typename Context>
53 struct sequence_size_subject
54 : sequence_size<typename Parser::subject_type, Context> {};
56 template <typename Parser, typename Context>
57 struct sequence_size<Parser, Context
58 , typename enable_if_c<(Parser::is_pass_through_unary)>::type>
59 : sequence_size_subject<Parser, Context> {};
61 template <typename L, typename R, typename Context>
62 struct sequence_size<sequence<L, R>, Context>
64 static int const value =
65 sequence_size<L, Context>::value +
66 sequence_size<R, Context>::value;
69 struct pass_sequence_attribute_unused
71 typedef unused_type type;
81 template <typename Attribute>
82 struct pass_sequence_attribute_front
84 typedef typename fusion::result_of::front<Attribute>::type type;
86 static typename add_reference<type>::type
89 return fusion::front(attr);
93 template <typename Attribute>
94 struct pass_through_sequence_attribute
96 typedef Attribute& type;
98 template <typename Attribute_>
100 call(Attribute_& attr)
106 template <typename Parser, typename Attribute, bool pass_through>
107 struct pass_sequence_attribute_used :
109 (!pass_through && traits::is_size_one_sequence<Attribute>::value)
110 , pass_sequence_attribute_front<Attribute>
111 , pass_through_sequence_attribute<Attribute>>::type {};
113 template <typename Parser, typename Attribute, bool pass_through = false, typename Enable = void>
114 struct pass_sequence_attribute :
116 fusion::result_of::empty<Attribute>
117 , pass_sequence_attribute_unused
118 , pass_sequence_attribute_used<Parser, Attribute, pass_through>>::type {};
120 template <typename L, typename R, typename Attribute, bool pass_through>
121 struct pass_sequence_attribute<sequence<L, R>, Attribute, pass_through>
122 : pass_through_sequence_attribute<Attribute> {};
124 template <typename Parser, typename Attribute>
125 struct pass_sequence_attribute_subject :
126 pass_sequence_attribute<typename Parser::subject_type, Attribute> {};
128 template <typename Parser, typename Attribute, bool pass_through>
129 struct pass_sequence_attribute<Parser, Attribute, pass_through
130 , typename enable_if_c<(Parser::is_pass_through_unary)>::type>
131 : pass_sequence_attribute_subject<Parser, Attribute> {};
133 template <typename L, typename R, typename Attribute, typename Context
134 , typename Enable = void>
135 struct partition_attribute
137 static int const l_size = sequence_size<L, Context>::value;
138 static int const r_size = sequence_size<R, Context>::value;
140 // If you got an error here, then you are trying to pass
141 // a fusion sequence with the wrong number of elements
142 // as that expected by the (sequence) parser.
144 fusion::result_of::size<Attribute>::value == (l_size + r_size)
145 , "Attribute does not have the expected size."
148 typedef typename fusion::result_of::begin<Attribute>::type l_begin;
149 typedef typename fusion::result_of::advance_c<l_begin, l_size>::type l_end;
150 typedef typename fusion::result_of::end<Attribute>::type r_end;
151 typedef fusion::iterator_range<l_begin, l_end> l_part;
152 typedef fusion::iterator_range<l_end, r_end> r_part;
153 typedef pass_sequence_attribute<L, l_part, false> l_pass;
154 typedef pass_sequence_attribute<R, r_part, false> r_pass;
156 static l_part left(Attribute& s)
158 auto i = fusion::begin(s);
159 return l_part(i, fusion::advance_c<l_size>(i));
162 static r_part right(Attribute& s)
165 fusion::advance_c<l_size>(fusion::begin(s))
170 template <typename L, typename R, typename Attribute, typename Context>
171 struct partition_attribute<L, R, Attribute, Context,
172 typename enable_if_c<(!traits::has_attribute<L, Context>::value &&
173 traits::has_attribute<R, Context>::value)>::type>
175 typedef unused_type l_part;
176 typedef Attribute& r_part;
177 typedef pass_sequence_attribute_unused l_pass;
178 typedef pass_sequence_attribute<R, Attribute, true> r_pass;
180 static unused_type left(Attribute&)
185 static Attribute& right(Attribute& s)
191 template <typename L, typename R, typename Attribute, typename Context>
192 struct partition_attribute<L, R, Attribute, Context,
193 typename enable_if_c<(traits::has_attribute<L, Context>::value &&
194 !traits::has_attribute<R, Context>::value)>::type>
196 typedef Attribute& l_part;
197 typedef unused_type r_part;
198 typedef pass_sequence_attribute<L, Attribute, true> l_pass;
199 typedef pass_sequence_attribute_unused r_pass;
201 static Attribute& left(Attribute& s)
206 static unused_type right(Attribute&)
212 template <typename L, typename R, typename Attribute, typename Context>
213 struct partition_attribute<L, R, Attribute, Context,
214 typename enable_if_c<(!traits::has_attribute<L, Context>::value &&
215 !traits::has_attribute<R, Context>::value)>::type>
217 typedef unused_type l_part;
218 typedef unused_type r_part;
219 typedef pass_sequence_attribute_unused l_pass;
220 typedef pass_sequence_attribute_unused r_pass;
222 static unused_type left(Attribute&)
227 static unused_type right(Attribute&)
233 template <typename L, typename R, typename C>
234 struct get_sequence_types
238 typename traits::attribute_of<L, C>::type
239 , typename traits::attribute_of<R, C>::type
244 template <typename LL, typename LR, typename R, typename C>
245 struct get_sequence_types<sequence<LL, LR>, R, C>
246 : mpl::push_back< typename get_sequence_types<LL, LR, C>::type
247 , typename traits::attribute_of<R, C>::type> {};
249 template <typename L, typename RL, typename RR, typename C>
250 struct get_sequence_types<L, sequence<RL, RR>, C>
251 : mpl::push_front< typename get_sequence_types<RL, RR, C>::type
252 , typename traits::attribute_of<L, C>::type> {};
254 template <typename LL, typename LR, typename RL, typename RR, typename C>
255 struct get_sequence_types<sequence<LL, LR>, sequence<RL, RR>, C>
257 typedef typename get_sequence_types<LL, LR, C>::type left;
258 typedef typename get_sequence_types<RL, RR, C>::type right;
260 mpl::insert_range<left, typename mpl::end<left>::type, right>::type
264 template <typename L, typename R, typename C>
265 struct attribute_of_sequence
267 // Get all sequence attribute types
268 typedef typename get_sequence_types<L, R, C>::type all_types;
270 // Filter all unused_types
274 , mpl::not_<is_same<mpl::_1, unused_type>>
275 , mpl::back_inserter<mpl::vector<>>
279 // Build a fusion::deque if filtered_types is not empty,
280 // else just return unused_type
283 mpl::empty<filtered_types>
284 , mpl::identity<unused_type>
285 , mpl::if_<mpl::equal_to<mpl::size<filtered_types>, mpl::int_<1> >,
286 typename mpl::front<filtered_types>::type
287 , typename fusion::result_of::as_deque<filtered_types>::type >
292 template <typename Parser, typename Iterator, typename Context
293 , typename RContext, typename Attribute>
295 Parser const& parser, Iterator& first, Iterator const& last
296 , Context const& context, RContext& rcontext, Attribute& attr
297 , traits::tuple_attribute)
299 typedef typename Parser::left_type Left;
300 typedef typename Parser::right_type Right;
301 typedef partition_attribute<Left, Right, Attribute, Context> partition;
302 typedef typename partition::l_pass l_pass;
303 typedef typename partition::r_pass r_pass;
305 typename partition::l_part l_part = partition::left(attr);
306 typename partition::r_part r_part = partition::right(attr);
307 typename l_pass::type l_attr = l_pass::call(l_part);
308 typename r_pass::type r_attr = r_pass::call(r_part);
310 Iterator save = first;
311 if (parser.left.parse(first, last, context, rcontext, l_attr)
312 && parser.right.parse(first, last, context, rcontext, r_attr))
318 template <typename Parser, typename Iterator, typename Context
319 , typename RContext, typename Attribute>
320 bool parse_sequence_plain(
321 Parser const& parser, Iterator& first, Iterator const& last
322 , Context const& context, RContext& rcontext, Attribute& attr)
324 typedef typename Parser::left_type Left;
325 typedef typename Parser::right_type Right;
326 typedef typename traits::attribute_of<Left, Context>::type l_attr_type;
327 typedef typename traits::attribute_of<Right, Context>::type r_attr_type;
328 typedef traits::make_attribute<l_attr_type, Attribute> l_make_attribute;
329 typedef traits::make_attribute<r_attr_type, Attribute> r_make_attribute;
331 typename l_make_attribute::type l_attr = l_make_attribute::call(attr);
332 typename r_make_attribute::type r_attr = r_make_attribute::call(attr);
334 Iterator save = first;
335 if (parser.left.parse(first, last, context, rcontext, l_attr)
336 && parser.right.parse(first, last, context, rcontext, r_attr))
342 template <typename Parser, typename Iterator, typename Context
343 , typename RContext, typename Attribute>
345 Parser const& parser, Iterator& first, Iterator const& last
346 , Context const& context, RContext& rcontext, Attribute& attr
347 , traits::plain_attribute)
349 return parse_sequence_plain(parser, first, last, context, rcontext, attr);
352 template <typename Parser, typename Iterator, typename Context
353 , typename RContext, typename Attribute>
355 Parser const& parser, Iterator& first, Iterator const& last
356 , Context const& context, RContext& rcontext, Attribute& attr
357 , traits::variant_attribute)
359 return parse_sequence_plain(parser, first, last, context, rcontext, attr);
362 template <typename Left, typename Right, typename Iterator
363 , typename Context, typename RContext, typename Attribute>
365 Left const& left, Right const& right
366 , Iterator& first, Iterator const& last
367 , Context const& context, RContext& rcontext, Attribute& attr
368 , traits::container_attribute);
370 template <typename Parser, typename Iterator, typename Context
371 , typename RContext, typename Attribute>
373 Parser const& parser , Iterator& first, Iterator const& last
374 , Context const& context, RContext& rcontext, Attribute& attr
375 , traits::container_attribute)
377 Iterator save = first;
378 if (parse_into_container(parser.left, first, last, context, rcontext, attr)
379 && parse_into_container(parser.right, first, last, context, rcontext, attr))
385 template <typename Parser, typename Iterator, typename Context
386 , typename RContext, typename Attribute>
387 bool parse_sequence_assoc(
388 Parser const& parser , Iterator& first, Iterator const& last
389 , Context const& context, RContext& rcontext, Attribute& attr, mpl::false_ /*should_split*/)
391 return parse_into_container(parser, first, last, context, rcontext, attr);
394 template <typename Parser, typename Iterator, typename Context
395 , typename RContext, typename Attribute>
396 bool parse_sequence_assoc(
397 Parser const& parser , Iterator& first, Iterator const& last
398 , Context const& context, RContext& rcontext, Attribute& attr, mpl::true_ /*should_split*/)
400 Iterator save = first;
401 if (parser.left.parse( first, last, context, rcontext, attr)
402 && parser.right.parse(first, last, context, rcontext, attr))
408 template <typename Parser, typename Iterator, typename Context
409 , typename RContext, typename Attribute>
411 Parser const& parser, Iterator& first, Iterator const& last
412 , Context const& context, RContext& rcontext, Attribute& attr
413 , traits::associative_attribute)
415 // we can come here in 2 cases:
416 // - when sequence is key >> value and therefore must
417 // be parsed with tuple synthesized attribute and then
418 // that tuple is used to save into associative attribute provided here.
419 // Example: key >> value;
421 // - when either this->left or this->right provides full key-value
422 // pair (like in case 1) and another one provides nothing.
423 // Example: eps >> rule<class x; fusion::map<...> >
425 // first case must be parsed as whole, and second one should
426 // be parsed separately for left and right.
428 typedef typename traits::attribute_of<
429 decltype(parser.left), Context>::type l_attr_type;
430 typedef typename traits::attribute_of<
431 decltype(parser.right), Context>::type r_attr_type;
435 is_same<l_attr_type, unused_type>
436 , is_same<r_attr_type, unused_type> >
439 return parse_sequence_assoc(parser, first, last, context, rcontext, attr
443 template <typename Left, typename Right, typename Context, typename RContext>
444 struct parse_into_container_impl<sequence<Left, Right>, Context, RContext>
446 typedef sequence<Left, Right> parser_type;
448 template <typename Iterator, typename Attribute>
450 parser_type const& parser
451 , Iterator& first, Iterator const& last
452 , Context const& context, RContext& rcontext, Attribute& attr, mpl::false_)
454 // inform user what went wrong if we jumped here in attempt to
455 // parse incompatible sequence into fusion::map
456 static_assert(!is_same< typename traits::attribute_category<Attribute>::type,
457 traits::associative_attribute>::value,
458 "To parse directly into fusion::map sequence must produce tuple attribute "
459 "where type of first element is existing key in fusion::map and second element "
460 "is value to be stored under that key");
463 if (!parse_sequence(parser
464 , first, last, context, rcontext, attr_, traits::container_attribute()))
468 traits::append(attr, traits::begin(attr_), traits::end(attr_));
472 template <typename Iterator, typename Attribute>
474 parser_type const& parser
475 , Iterator& first, Iterator const& last
476 , Context const& context, RContext& rcontext, Attribute& attr, mpl::true_)
478 return parse_into_container_base_impl<parser_type>::call(
479 parser, first, last, context, rcontext, attr);
482 template <typename Iterator, typename Attribute>
484 parser_type const& parser
485 , Iterator& first, Iterator const& last
486 , Context const& context, RContext& rcontext, Attribute& attr)
489 traits::attribute_of<parser_type, Context>::type
493 traits::container_value<Attribute>::type
496 return call(parser, first, last, context, rcontext, attr
497 , typename traits::is_substitute<attribute_type, value_type>::type());