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// Copyright (c) 2001-2011 Hartmut Kaiser
// Copyright (c) 2001-2011 Joel de Guzman
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
#if !defined(SPIRIT_KARMA_ALTERNATIVE_MAR_01_2007_1117AM)
#define SPIRIT_KARMA_ALTERNATIVE_MAR_01_2007_1117AM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/karma/detail/alternative_function.hpp>
#include <boost/spirit/home/karma/detail/get_stricttag.hpp>
#include <boost/spirit/home/karma/domain.hpp>
#include <boost/spirit/home/karma/generator.hpp>
#include <boost/spirit/home/karma/meta_compiler.hpp>
#include <boost/spirit/home/support/info.hpp>
#include <boost/spirit/home/support/unused.hpp>
#include <boost/spirit/home/support/has_semantic_action.hpp>
#include <boost/spirit/home/support/handles_container.hpp>
#include <boost/spirit/home/support/detail/what_function.hpp>
#include <boost/fusion/include/any.hpp>
#include <boost/fusion/include/mpl.hpp>
#include <boost/fusion/include/for_each.hpp>
#include <boost/mpl/accumulate.hpp>
#include <boost/mpl/bitor.hpp>
#include <boost/config.hpp>
namespace boost { namespace spirit
{
///////////////////////////////////////////////////////////////////////////
// Enablers
///////////////////////////////////////////////////////////////////////////
template <>
struct use_operator<karma::domain, proto::tag::bitwise_or> // enables |
: mpl::true_ {};
template <>
struct flatten_tree<karma::domain, proto::tag::bitwise_or> // flattens |
: mpl::true_ {};
}}
///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit { namespace traits
{
// specialization for sequences
template <typename Elements>
struct alternative_properties
{
struct element_properties
{
template <typename T>
struct result;
template <typename F, typename Element>
struct result<F(Element)>
{
typedef properties_of<Element> type;
};
// never called, but needed for decltype-based result_of (C++0x)
#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
template <typename Element>
typename result<element_properties(Element)>::type
operator()(Element&&) const;
#endif
};
typedef typename mpl::accumulate<
typename fusion::result_of::transform<
Elements, element_properties>::type
, mpl::int_<karma::generator_properties::countingbuffer>
, mpl::bitor_<mpl::_2, mpl::_1>
>::type type;
};
}}}
namespace boost { namespace spirit { namespace karma
{
template <typename Elements, typename Strict, typename Derived>
struct base_alternative : nary_generator<Derived>
{
typedef typename traits::alternative_properties<Elements>::type
properties;
template <typename Context, typename Iterator = unused_type>
struct attribute
{
// Put all the element attributes in a tuple
typedef typename traits::build_attribute_sequence<
Elements, Context, traits::alternative_attribute_transform
, Iterator, karma::domain
>::type all_attributes;
// Ok, now make a variant over the attribute sequence. Note that
// build_variant makes sure that 1) all attributes in the variant
// are unique 2) puts the unused attribute, if there is any, to
// the front and 3) collapses single element variants, variant<T>
// to T.
typedef typename traits::build_variant<all_attributes>::type type;
};
base_alternative(Elements const& elements)
: elements(elements) {}
template <
typename OutputIterator, typename Context, typename Delimiter
, typename Attribute>
bool generate(OutputIterator& sink, Context& ctx
, Delimiter const& d, Attribute const& attr) const
{
typedef detail::alternative_generate_function<
OutputIterator, Context, Delimiter, Attribute, Strict
> functor;
// f return true if *any* of the parser succeeds
functor f (sink, ctx, d, attr);
return fusion::any(elements, f);
}
template <typename Context>
info what(Context& context) const
{
info result("alternative");
fusion::for_each(elements,
spirit::detail::what_function<Context>(result, context));
return result;
}
Elements elements;
};
template <typename Elements>
struct alternative
: base_alternative<Elements, mpl::false_, alternative<Elements> >
{
typedef base_alternative<Elements, mpl::false_, alternative>
base_alternative_;
alternative(Elements const& elements)
: base_alternative_(elements) {}
};
template <typename Elements>
struct strict_alternative
: base_alternative<Elements, mpl::true_, strict_alternative<Elements> >
{
typedef base_alternative<Elements, mpl::true_, strict_alternative>
base_alternative_;
strict_alternative(Elements const& elements)
: base_alternative_(elements) {}
};
///////////////////////////////////////////////////////////////////////////
// Generator generators: make_xxx function (objects)
///////////////////////////////////////////////////////////////////////////
namespace detail
{
template <typename Elements, bool strict_mode = false>
struct make_alternative
: make_nary_composite<Elements, alternative>
{};
template <typename Elements>
struct make_alternative<Elements, true>
: make_nary_composite<Elements, strict_alternative>
{};
}
template <typename Elements, typename Modifiers>
struct make_composite<proto::tag::bitwise_or, Elements, Modifiers>
: detail::make_alternative<Elements
, detail::get_stricttag<Modifiers>::value>
{};
}}}
namespace boost { namespace spirit { namespace traits
{
///////////////////////////////////////////////////////////////////////////
template <typename Elements>
struct has_semantic_action<karma::alternative<Elements> >
: nary_has_semantic_action<Elements> {};
template <typename Elements>
struct has_semantic_action<karma::strict_alternative<Elements> >
: nary_has_semantic_action<Elements> {};
///////////////////////////////////////////////////////////////////////////
template <typename Elements, typename Attribute, typename Context
, typename Iterator>
struct handles_container<karma::alternative<Elements>
, Attribute, Context, Iterator>
: nary_handles_container<Elements, Attribute, Context, Iterator> {};
template <typename Elements, typename Attribute, typename Context
, typename Iterator>
struct handles_container<karma::strict_alternative<Elements>
, Attribute, Context, Iterator>
: nary_handles_container<Elements, Attribute, Context, Iterator> {};
}}}
#endif
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