boost/spirit/utility/impl/lists.ipp
/*=============================================================================
Copyright (c) 2002-2003 Hartmut Kaiser
http://spirit.sourceforge.net/
Use, modification and distribution is subject to 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)
=============================================================================*/
#ifndef BOOST_SPIRIT_LISTS_IPP
#define BOOST_SPIRIT_LISTS_IPP
///////////////////////////////////////////////////////////////////////////////
#include <boost/spirit/meta/refactoring.hpp>
///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit {
///////////////////////////////////////////////////////////////////////////////
//
// list_parser_type class implementation
//
///////////////////////////////////////////////////////////////////////////////
struct no_list_endtoken { typedef no_list_endtoken embed_t; };
namespace impl {
///////////////////////////////////////////////////////////////////////////////
//
// Refactor the original list item parser
//
///////////////////////////////////////////////////////////////////////////////
// match list with 'extended' syntax
template <typename EndT>
struct select_list_parse_refactor {
template <
typename ParserT, typename ScannerT,
typename ItemT, typename DelimT
>
static typename parser_result<ParserT, ScannerT>::type
parse(ScannerT const& scan, ParserT const& /*p*/,
ItemT const &item, DelimT const &delim, EndT const &end)
{
typedef refactor_action_gen<refactor_unary_gen<> > refactor_t;
const refactor_t refactor_item_d = refactor_t(refactor_unary_d);
return (
refactor_item_d[item - (end | delim)]
>> *(delim >> refactor_item_d[item - (end | delim)])
>> !(delim >> end)
).parse(scan);
}
};
// match list with 'normal' syntax (without an 'end' parser)
template <>
struct select_list_parse_refactor<no_list_endtoken> {
template <
typename ParserT, typename ScannerT,
typename ItemT, typename DelimT
>
static typename parser_result<ParserT, ScannerT>::type
parse(ScannerT const& scan, ParserT const& /*p*/,
ItemT const &item, DelimT const &delim, no_list_endtoken const&)
{
typedef refactor_action_gen<refactor_unary_gen<> > refactor_t;
const refactor_t refactor_item_d = refactor_t(refactor_unary_d);
return (
refactor_item_d[item - delim]
>> *(delim >> refactor_item_d[item - delim])
).parse(scan);
}
};
///////////////////////////////////////////////////////////////////////////////
//
// Do not refactor the original list item parser.
//
///////////////////////////////////////////////////////////////////////////////
// match list with 'extended' syntax
template <typename EndT>
struct select_list_parse_no_refactor {
template <
typename ParserT, typename ScannerT,
typename ItemT, typename DelimT
>
static typename parser_result<ParserT, ScannerT>::type
parse(ScannerT const& scan, ParserT const& /*p*/,
ItemT const &item, DelimT const &delim, EndT const &end)
{
return (
(item - (end | delim))
>> *(delim >> (item - (end | delim)))
>> !(delim >> end)
).parse(scan);
}
};
// match list with 'normal' syntax (without an 'end' parser)
template <>
struct select_list_parse_no_refactor<no_list_endtoken> {
template <
typename ParserT, typename ScannerT,
typename ItemT, typename DelimT
>
static typename parser_result<ParserT, ScannerT>::type
parse(ScannerT const& scan, ParserT const& /*p*/,
ItemT const &item, DelimT const &delim, no_list_endtoken const&)
{
return (
(item - delim)
>> *(delim >> (item - delim))
).parse(scan);
}
};
// the refactoring is handled by the refactoring parsers, so here there
// is no need to pay attention to these issues.
template <typename CategoryT>
struct list_parser_type {
template <
typename ParserT, typename ScannerT,
typename ItemT, typename DelimT, typename EndT
>
static typename parser_result<ParserT, ScannerT>::type
parse(ScannerT const& scan, ParserT const& p,
ItemT const &item, DelimT const &delim, EndT const &end)
{
return select_list_parse_refactor<EndT>::
parse(scan, p, item, delim, end);
}
};
template <>
struct list_parser_type<plain_parser_category> {
template <
typename ParserT, typename ScannerT,
typename ItemT, typename DelimT, typename EndT
>
static typename parser_result<ParserT, ScannerT>::type
parse(ScannerT const& scan, ParserT const& p,
ItemT const &item, DelimT const &delim, EndT const &end)
{
return select_list_parse_no_refactor<EndT>::
parse(scan, p, item, delim, end);
}
};
} // namespace impl
///////////////////////////////////////////////////////////////////////////////
}} // namespace boost::spirit
#endif
