90 lines
3.3 KiB
C++
Executable File
90 lines
3.3 KiB
C++
Executable File
// Copyright (c) 2001-2008 Hartmut Kaiser
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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(BOOST_SPIRIT_KARMA_ACTION_MAR_07_2007_0851AM)
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#define BOOST_SPIRIT_KARMA_ACTION_MAR_07_2007_0851AM
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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/support/component.hpp>
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#include <boost/spirit/home/support/detail/values.hpp>
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#include <boost/spirit/home/support/attribute_of.hpp>
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#include <boost/spirit/home/support/detail/action_dispatch.hpp>
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#include <boost/spirit/home/karma/domain.hpp>
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#include <boost/mpl/if.hpp>
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#include <boost/mpl/identity.hpp>
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#include <boost/type_traits/remove_const.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <vector>
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namespace boost { namespace spirit { namespace karma
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{
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///////////////////////////////////////////////////////////////////////////
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struct sequence; // forward declaration only
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///////////////////////////////////////////////////////////////////////////
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struct action
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{
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template <typename Component, typename Context, typename Unused>
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struct attribute
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: traits::attribute_of<
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karma::domain,
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typename result_of::left<Component>::type,
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Context
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>
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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 typename
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result_of::left<Component>::type::director
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director;
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typedef typename is_same<director, sequence>::type is_sequence;
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typedef typename
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attribute<Component, Context, unused_type>::type
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param_type;
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// create a parameter if one is not supplied
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// this creates a _copy_ of the parameter because the semantic
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// action likely will change parts of this
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typename mpl::if_<
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is_same<typename remove_const<Parameter>::type, unused_type>,
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param_type,
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Parameter
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>::type p = spirit::detail::make_value<param_type>::call(param);
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// call the function, passing the parameter, the context
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// and a bool flag that the client can set to false to
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// fail generating.
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// The client can return false to fail parsing.
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bool pass = spirit::detail::action_dispatch(
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spirit::right(component), p, ctx, is_sequence());
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return pass &&
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director::generate(spirit::left(component), sink, ctx, d, p);
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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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typedef typename
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spirit::result_of::left<Component>::type::director
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director;
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return director::what(spirit::left(component), ctx);
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}
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};
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}}}
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#endif
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