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146 lines
5.5 KiB
146 lines
5.5 KiB
/*============================================================================= |
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Copyright (c) 2001-2011 Joel de Guzman |
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Distributed under the Boost Software License, Version 1.0. (See accompanying |
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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=============================================================================*/ |
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#if !defined(SPIRIT_PERMUTATION_OR_MARCH_13_2007_1145PM) |
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#define SPIRIT_PERMUTATION_OR_MARCH_13_2007_1145PM |
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#if defined(_MSC_VER) |
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#pragma once |
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#endif |
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#include <boost/spirit/home/qi/meta_compiler.hpp> |
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#include <boost/spirit/home/qi/detail/permute_function.hpp> |
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#include <boost/spirit/home/qi/detail/attributes.hpp> |
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#include <boost/spirit/home/support/algorithm/any_if_ns.hpp> |
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#include <boost/spirit/home/support/detail/what_function.hpp> |
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#include <boost/spirit/home/support/has_semantic_action.hpp> |
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#include <boost/spirit/home/support/handles_container.hpp> |
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#include <boost/spirit/home/support/info.hpp> |
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#include <boost/fusion/include/size.hpp> |
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#include <boost/optional.hpp> |
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#include <boost/foreach.hpp> |
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#include <boost/array.hpp> |
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namespace boost { namespace spirit |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// Enablers |
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/////////////////////////////////////////////////////////////////////////// |
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template <> |
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struct use_operator<qi::domain, proto::tag::bitwise_xor> // enables ^ |
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: mpl::true_ {}; |
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template <> |
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struct flatten_tree<qi::domain, proto::tag::bitwise_xor> // flattens ^ |
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: mpl::true_ {}; |
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}} |
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namespace boost { namespace spirit { namespace qi |
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{ |
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template <typename Elements> |
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struct permutation : nary_parser<permutation<Elements> > |
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{ |
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template <typename Context, typename Iterator> |
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struct attribute |
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{ |
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// Put all the element attributes in a tuple, |
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// wrapping each element in a boost::optional |
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typedef typename traits::build_attribute_sequence< |
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Elements, Context, traits::permutation_attribute_transform |
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, Iterator, qi::domain |
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>::type all_attributes; |
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// Now, build a fusion vector over the attributes. Note |
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// that build_fusion_vector 1) removes all unused attributes |
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// and 2) may return unused_type if all elements have |
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// unused_type(s). |
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typedef typename |
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traits::build_fusion_vector<all_attributes>::type |
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type; |
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}; |
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permutation(Elements const& elements) |
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: elements(elements) {} |
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template <typename Iterator, typename Context |
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, typename Skipper, typename Attribute> |
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bool parse(Iterator& first, Iterator const& last |
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, Context& context, Skipper const& skipper |
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, Attribute& attr_) const |
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{ |
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typedef traits::attribute_not_unused<Context, Iterator> predicate; |
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detail::permute_function<Iterator, Context, Skipper> |
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f(first, last, context, skipper); |
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boost::array<bool, fusion::result_of::size<Elements>::value> flags; |
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BOOST_FOREACH(bool& taken, flags) |
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{ |
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taken = false; |
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} |
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// wrap the attribute in a tuple if it is not a tuple |
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typename traits::wrap_if_not_tuple<Attribute>::type attr(attr_); |
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// We have a bool array 'flags' with one flag for each parser. |
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// permute_function sets the slot to true when the corresponding |
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// parser successful matches. We loop until there are no more |
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// successful parsers. |
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bool result = false; |
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f.taken = flags.begin(); |
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while (spirit::any_if_ns(elements, attr, f, predicate())) |
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{ |
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f.taken = flags.begin(); |
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result = true; |
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} |
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return result; |
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} |
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template <typename Context> |
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info what(Context& context) const |
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{ |
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info result("permutation"); |
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fusion::for_each(elements, |
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spirit::detail::what_function<Context>(result, context)); |
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return result; |
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} |
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Elements elements; |
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}; |
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/////////////////////////////////////////////////////////////////////////// |
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// Parser generators: make_xxx function (objects) |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Elements, typename Modifiers> |
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struct make_composite<proto::tag::bitwise_xor, Elements, Modifiers> |
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: make_nary_composite<Elements, permutation> |
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{}; |
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}}} |
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namespace boost { namespace spirit { namespace traits |
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{ |
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/////////////////////////////////////////////////////////////////////////// |
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// We specialize this for permutation (see support/attributes.hpp). |
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// For permutation, we only wrap the attribute in a tuple IFF |
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// it is not already a fusion tuple. |
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template <typename Elements, typename Attribute> |
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struct pass_attribute<qi::permutation<Elements>, Attribute> |
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: wrap_if_not_tuple<Attribute> {}; |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Elements> |
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struct has_semantic_action<qi::permutation<Elements> > |
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: nary_has_semantic_action<Elements> {}; |
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/////////////////////////////////////////////////////////////////////////// |
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template <typename Elements, typename Attribute, typename Context |
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, typename Iterator> |
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struct handles_container<qi::permutation<Elements>, Attribute, Context |
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, Iterator> |
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: nary_handles_container<Elements, Attribute, Context, Iterator> {}; |
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}}} |
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#endif
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