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// Copyright (c) 2001-2010 Hartmut Kaiser
//
// 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(ITER_POS_NOV_20_2009_1245PM)
#define ITER_POS_NOV_20_2009_1245PM
#include <boost/spirit/include/qi_parse.hpp>
///////////////////////////////////////////////////////////////////////////////
// definition the place holder
namespace custom_parser
{
BOOST_SPIRIT_TERMINAL(iter_pos)
}
///////////////////////////////////////////////////////////////////////////////
// implementation the enabler
namespace boost { namespace spirit
{
// We want custom_parser::iter_pos to be usable as a terminal only,
// and only for parser expressions (qi::domain).
template <>
struct use_terminal<qi::domain, custom_parser::tag::iter_pos>
: mpl::true_
{};
}}
///////////////////////////////////////////////////////////////////////////////
// implementation of the parser
namespace custom_parser
{
struct iter_pos_parser
: boost::spirit::qi::primitive_parser<iter_pos_parser>
{
// Define the attribute type exposed by this parser component
template <typename Context, typename Iterator>
struct attribute
{
typedef Iterator type;
};
// This function is called during the actual parsing process
template <typename Iterator, typename Context
, typename Skipper, typename Attribute>
bool parse(Iterator& first, Iterator const& last
, Context&, Skipper const& skipper, Attribute& attr) const
{
boost::spirit::qi::skip_over(first, last, skipper);
boost::spirit::traits::assign_to(first, attr);
return true;
}
// This function is called during error handling to create
// a human readable string for the error context.
template <typename Context>
boost::spirit::info what(Context&) const
{
return boost::spirit::info("iter_pos");
}
};
}
///////////////////////////////////////////////////////////////////////////////
// instantiation of the parser
namespace boost { namespace spirit { namespace qi
{
// This is the factory function object invoked in order to create
// an instance of our iter_pos_parser.
template <typename Modifiers>
struct make_primitive<custom_parser::tag::iter_pos, Modifiers>
{
typedef custom_parser::iter_pos_parser result_type;
result_type operator()(unused_type, unused_type) const
{
return result_type();
}
};
}}}
#endif
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