97 lines
3.4 KiB
C++
Executable File
97 lines
3.4 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_ACTION_JAN_07_2007_1128AM)
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#define SPIRIT_ACTION_JAN_07_2007_1128AM
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#include <boost/spirit/home/qi/domain.hpp>
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#include <boost/spirit/home/support/component.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/mpl/if.hpp>
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#include <boost/mpl/bool.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 qi
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{
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struct action
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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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: traits::attribute_of<
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qi::domain
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, typename result_of::left<Component>::type
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, Context
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, Iterator
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>
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{
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};
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template <typename F, typename Attribute, typename Context>
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static bool const_action_dispatch(
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F const& f, Attribute const& attr, Context& context)
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{
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// This function makes Attribute a const reference
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// before calling detail::action_dispatch whereby
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// disallowing mutability of the attribute in semantic
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// actions.
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return spirit::detail::action_dispatch(f, attr, context,
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mpl::true_());
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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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typedef typename
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result_of::left<Component>::type::director
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director;
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typedef typename
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attribute<Component, Context, Iterator>::type
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attr_type;
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// create an attribute if one is not supplied
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typename mpl::if_<
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is_same<typename remove_const<Attribute>::type, unused_type>
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, typename remove_const<attr_type>::type
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, Attribute&>::type
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attr = spirit::detail::make_value<attr_type>::call(attr_);
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if (director::parse(
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spirit::left(component), first, last, context, skipper, attr))
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{
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// call the function, passing the attribute, the context.
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// The client can return false to fail parsing.
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return const_action_dispatch(
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spirit::right(component), attr, context);
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}
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return false;
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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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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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