81 lines
2.9 KiB
C++
Executable File
81 lines
2.9 KiB
C++
Executable File
// Copyright (c) 2001-2008 Hartmut Kaiser
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// Copyright (c) 2001-2007 Joel de Guzman
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//
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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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#if !defined(SPIRIT_KARMA_ALTERNATIVE_MAR_01_2007_1117AM)
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#define SPIRIT_KARMA_ALTERNATIVE_MAR_01_2007_1117AM
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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#pragma once // MS compatible compilers support #pragma once
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#endif
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#include <boost/spirit/home/karma/operator/detail/alternative.hpp>
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#include <boost/spirit/home/support/attribute_transform.hpp>
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#include <boost/spirit/home/support/as_variant.hpp>
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#include <boost/spirit/home/support/detail/what_function.hpp>
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#include <boost/spirit/home/support/algorithm/any.hpp>
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#include <boost/spirit/home/support/unused.hpp>
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#include <boost/fusion/include/for_each.hpp>
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#include <boost/fusion/include/mpl.hpp>
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#include <boost/fusion/include/transform.hpp>
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#include <boost/variant.hpp>
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#include <boost/mpl/vector.hpp>
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#include <boost/mpl/end.hpp>
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#include <boost/mpl/insert_range.hpp>
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#include <boost/mpl/transform_view.hpp>
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namespace boost { namespace spirit { namespace karma
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{
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struct alternative
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{
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template <typename T>
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struct transform_child : mpl::identity<T> {};
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template <typename All, typename Filtered>
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struct build_container
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{
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// Ok, now make a variant over the attribute_sequence. It's
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// a pity that make_variant_over does not support forward MPL
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// sequences. We use our own conversion metaprogram (as_variant).
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typedef typename
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as_variant<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<alternative, Component, Iterator, Context>
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{
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};
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template <typename Component, typename OutputIterator,
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typename Context, typename Delimiter, typename Parameter>
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static bool
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generate(Component const& component, OutputIterator& sink,
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Context& ctx, Delimiter const& d, Parameter const& param)
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{
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typedef detail::alternative_generate_functor<
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OutputIterator, Context, Delimiter, Parameter
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> functor;
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// f return true if *any* of the parser succeeds
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functor f (sink, ctx, d, param);
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return fusion::any(component.elements, f);
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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 = "alternatives[";
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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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