97 lines
3.2 KiB
C++
Executable File
97 lines
3.2 KiB
C++
Executable File
/*=============================================================================
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Copyright (c) 2001-2007 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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#include <boost/spirit/home/qi/detail/permute_function.hpp>
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#include <boost/spirit/home/support/attribute_transform.hpp>
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#include <boost/spirit/home/support/algorithm/any.hpp>
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#include <boost/spirit/home/support/detail/what_function.hpp>
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#include <boost/fusion/include/vector.hpp>
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#include <boost/fusion/include/as_vector.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 { namespace qi
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{
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struct permutation
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{
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template <typename T>
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struct transform_child
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{
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typedef boost::optional<T> type;
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};
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template <typename All, typename Filtered>
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struct build_container
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{
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typedef
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typename fusion::result_of::as_vector<Filtered>::type
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type;
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};
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template <typename Component, typename Context, typename Iterator>
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struct attribute :
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build_fusion_sequence<permutation, Component, Iterator, Context>
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{
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};
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template <
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typename Component
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, typename Iterator, typename Context
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, typename Skipper, typename Attribute>
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static bool parse(
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Component const& component
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, Iterator& first, Iterator const& last
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, Context& context, Skipper const& skipper
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, Attribute& attr)
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{
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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<
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bool
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, fusion::result_of::size<typename Component::elements_type>::value
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>
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slots;
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BOOST_FOREACH(bool& taken, slots)
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{
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taken = false;
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}
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// We have a bool array 'slots' 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 = slots.begin();
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while (spirit::any_ns(component.elements, attr, f))
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{
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f.taken = slots.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 Component, typename Context>
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static std::string what(Component const& component, Context const& ctx)
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{
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std::string result = "permutation[";
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fusion::for_each(component.elements,
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spirit::detail::what_function<Context>(result, ctx));
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result += "]";
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return result;
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}
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};
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}}}
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#endif
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