/*============================================================================= | |
Copyright (c) 2002-2003 Joel de Guzman | |
Copyright (c) 2002-2003 Hartmut Kaiser | |
Copyright (c) 2003 Martin Wille | |
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) | |
=============================================================================*/ | |
#if !defined(BOOST_SPIRIT_PARSER_TRAITS_IPP) | |
#define BOOST_SPIRIT_PARSER_TRAITS_IPP | |
#include <boost/spirit/home/classic/core/composite/operators.hpp> | |
/////////////////////////////////////////////////////////////////////////////// | |
namespace boost { namespace spirit { | |
BOOST_SPIRIT_CLASSIC_NAMESPACE_BEGIN | |
namespace impl | |
{ | |
#if defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) | |
/////////////////////////////////////////////////////////////////////////// | |
// | |
// from spirit 1.1 (copyright (c) 2001 Bruce Florman) | |
// various workarounds to support compile time decisions without partial | |
// template specialization whether a given type is an instance of a | |
// concrete parser type. | |
// | |
/////////////////////////////////////////////////////////////////////////// | |
/////////////////////////////////////////////////////////////////////////// | |
template <typename T> | |
struct parser_type_traits | |
{ | |
// Determine at compile time (without partial specialization) | |
// whether a given type is an instance of the alternative<A,B> | |
static T t(); | |
typedef struct { char dummy[1]; } size1_t; | |
typedef struct { char dummy[2]; } size2_t; | |
typedef struct { char dummy[3]; } size3_t; | |
typedef struct { char dummy[4]; } size4_t; | |
typedef struct { char dummy[5]; } size5_t; | |
typedef struct { char dummy[6]; } size6_t; | |
typedef struct { char dummy[7]; } size7_t; | |
typedef struct { char dummy[8]; } size8_t; | |
typedef struct { char dummy[9]; } size9_t; | |
typedef struct { char dummy[10]; } size10_t; | |
// the following functions need no implementation | |
template <typename A, typename B> | |
static size1_t test_(alternative<A, B> const&); | |
template <typename A, typename B> | |
static size2_t test_(sequence<A, B> const&); | |
template <typename A, typename B> | |
static size3_t test_(sequential_or<A, B> const&); | |
template <typename A, typename B> | |
static size4_t test_(intersection<A, B> const&); | |
template <typename A, typename B> | |
static size5_t test_(difference<A, B> const&); | |
template <typename A, typename B> | |
static size6_t test_(exclusive_or<A, B> const&); | |
template <typename S> | |
static size7_t test_(optional<S> const&); | |
template <typename S> | |
static size8_t test_(kleene_star<S> const&); | |
template <typename S> | |
static size9_t test_(positive<S> const&); | |
static size10_t test_(...); | |
BOOST_STATIC_CONSTANT(bool, | |
is_alternative = (sizeof(size1_t) == sizeof(test_(t()))) ); | |
BOOST_STATIC_CONSTANT(bool, | |
is_sequence = (sizeof(size2_t) == sizeof(test_(t()))) ); | |
BOOST_STATIC_CONSTANT(bool, | |
is_sequential_or = (sizeof(size3_t) == sizeof(test_(t()))) ); | |
BOOST_STATIC_CONSTANT(bool, | |
is_intersection = (sizeof(size4_t) == sizeof(test_(t()))) ); | |
BOOST_STATIC_CONSTANT(bool, | |
is_difference = (sizeof(size5_t) == sizeof(test_(t()))) ); | |
BOOST_STATIC_CONSTANT(bool, | |
is_exclusive_or = (sizeof(size6_t) == sizeof(test_(t()))) ); | |
BOOST_STATIC_CONSTANT(bool, | |
is_optional = (sizeof(size7_t) == sizeof(test_(t()))) ); | |
BOOST_STATIC_CONSTANT(bool, | |
is_kleene_star = (sizeof(size8_t) == sizeof(test_(t()))) ); | |
BOOST_STATIC_CONSTANT(bool, | |
is_positive = (sizeof(size9_t) == sizeof(test_(t()))) ); | |
}; | |
#else | |
/////////////////////////////////////////////////////////////////////////// | |
struct parser_type_traits_base { | |
BOOST_STATIC_CONSTANT(bool, is_alternative = false); | |
BOOST_STATIC_CONSTANT(bool, is_sequence = false); | |
BOOST_STATIC_CONSTANT(bool, is_sequential_or = false); | |
BOOST_STATIC_CONSTANT(bool, is_intersection = false); | |
BOOST_STATIC_CONSTANT(bool, is_difference = false); | |
BOOST_STATIC_CONSTANT(bool, is_exclusive_or = false); | |
BOOST_STATIC_CONSTANT(bool, is_optional = false); | |
BOOST_STATIC_CONSTANT(bool, is_kleene_star = false); | |
BOOST_STATIC_CONSTANT(bool, is_positive = false); | |
}; | |
template <typename ParserT> | |
struct parser_type_traits : public parser_type_traits_base { | |
// no definition here, fallback for all not explicitly mentioned parser | |
// types | |
}; | |
template <typename A, typename B> | |
struct parser_type_traits<alternative<A, B> > | |
: public parser_type_traits_base { | |
BOOST_STATIC_CONSTANT(bool, is_alternative = true); | |
}; | |
template <typename A, typename B> | |
struct parser_type_traits<sequence<A, B> > | |
: public parser_type_traits_base { | |
BOOST_STATIC_CONSTANT(bool, is_sequence = true); | |
}; | |
template <typename A, typename B> | |
struct parser_type_traits<sequential_or<A, B> > | |
: public parser_type_traits_base { | |
BOOST_STATIC_CONSTANT(bool, is_sequential_or = true); | |
}; | |
template <typename A, typename B> | |
struct parser_type_traits<intersection<A, B> > | |
: public parser_type_traits_base { | |
BOOST_STATIC_CONSTANT(bool, is_intersection = true); | |
}; | |
template <typename A, typename B> | |
struct parser_type_traits<difference<A, B> > | |
: public parser_type_traits_base { | |
BOOST_STATIC_CONSTANT(bool, is_difference = true); | |
}; | |
template <typename A, typename B> | |
struct parser_type_traits<exclusive_or<A, B> > | |
: public parser_type_traits_base { | |
BOOST_STATIC_CONSTANT(bool, is_exclusive_or = true); | |
}; | |
template <typename S> | |
struct parser_type_traits<optional<S> > | |
: public parser_type_traits_base { | |
BOOST_STATIC_CONSTANT(bool, is_optional = true); | |
}; | |
template <typename S> | |
struct parser_type_traits<kleene_star<S> > | |
: public parser_type_traits_base { | |
BOOST_STATIC_CONSTANT(bool, is_kleene_star = true); | |
}; | |
template <typename S> | |
struct parser_type_traits<positive<S> > | |
: public parser_type_traits_base { | |
BOOST_STATIC_CONSTANT(bool, is_positive = true); | |
}; | |
#endif // defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) | |
} // namespace impl | |
/////////////////////////////////////////////////////////////////////////////// | |
BOOST_SPIRIT_CLASSIC_NAMESPACE_END | |
}} // namespace boost::spirit | |
#endif // !defined(BOOST_SPIRIT_PARSER_TRAITS_IPP) |