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/*=============================================================================
Copyright (c) 2001-2011 Joel de Guzman
http://spirit.sourceforge.net/
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)
=============================================================================*/
#ifndef BOOST_SPIRIT_META_COMPILER_OCTOBER_16_2008_1258PM
#define BOOST_SPIRIT_META_COMPILER_OCTOBER_16_2008_1258PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/config.hpp>
#include <boost/spirit/include/phoenix_limits.hpp>
#include <boost/detail/workaround.hpp>
#include <boost/spirit/include/phoenix_limits.hpp> // needs to be included before proto
#include <boost/proto/proto.hpp>
#include <boost/spirit/home/support/make_component.hpp>
#include <boost/spirit/home/support/modify.hpp>
#include <boost/spirit/home/support/detail/make_cons.hpp>
#include <boost/spirit/home/support/unused.hpp>
#include <boost/spirit/home/support/assert_msg.hpp>
#include <boost/utility/enable_if.hpp>
#include <boost/type_traits/remove_reference.hpp>
namespace boost { namespace spirit
{
// Some defaults...
template <typename Domain, typename Tag, typename Enable = void>
struct use_operator : mpl::false_ {};
template <typename Domain, typename T, typename Enable = void>
struct use_function : mpl::false_ {};
template <typename Domain, typename T, typename Enable = void>
struct use_directive : mpl::false_ {};
template <typename Domain, typename T, typename Enable /* = void */>
struct is_modifier_directive : mpl::false_ {};
template <typename Domain, typename T, typename Enable = void>
struct use_terminal : mpl::false_ {};
template <typename Domain, typename T, typename Enable /*= void*/>
struct flatten_tree : mpl::false_ {};
// Our meta-compiler. This is the main engine that hooks Spirit
// to the proto expression template engine.
template <typename Domain>
struct meta_compiler
{
struct meta_grammar;
BOOST_SPIRIT_ASSERT_MSG((
!use_operator<Domain, proto::tag::subscript>::value
), error_proto_tag_subscript_cannot_be_used, ());
#if !BOOST_WORKAROUND(BOOST_MSVC, < 1400)
// this is the non-broken part for compilers properly supporting
// partial template specialization (VC7.1 does not)
struct cases
{
template <typename Tag, typename Enable = void>
struct case_
: proto::not_<proto::_>
{};
///////////////////////////////////////////////////////////////////
// terminals
///////////////////////////////////////////////////////////////////
template <typename Enable>
struct case_<proto::tag::terminal, Enable>
: proto::when<
proto::if_<use_terminal<Domain, proto::_value>()>,
detail::make_terminal<Domain>
>
{};
template <typename Tag>
struct case_<Tag, typename enable_if<use_operator<Domain, Tag> >::type>
: proto::or_<
///////////////////////////////////////////////////////////////////
// binary operators
///////////////////////////////////////////////////////////////////
proto::when<proto::binary_expr<Tag, meta_grammar, meta_grammar>,
detail::make_binary<Domain, Tag, meta_grammar>
>,
///////////////////////////////////////////////////////////////////
// unary operators
///////////////////////////////////////////////////////////////////
proto::when<proto::unary_expr<Tag, meta_grammar>,
detail::make_unary<Domain, Tag, meta_grammar>
>
>
{};
template <typename Enable>
struct case_<proto::tag::subscript, Enable>
: proto::or_<
///////////////////////////////////////////////////////////////////
// directives
///////////////////////////////////////////////////////////////////
proto::when<proto::binary_expr<proto::tag::subscript
, proto::and_<
proto::terminal<proto::_>
, proto::if_<use_directive<Domain, proto::_value >()> >
, meta_grammar>,
detail::make_directive<Domain, meta_grammar>
>,
///////////////////////////////////////////////////////////////////
// semantic actions
///////////////////////////////////////////////////////////////////
proto::when<proto::binary_expr<proto::tag::subscript
, meta_grammar, proto::_>,
detail::make_action<Domain, meta_grammar>
>
>
{};
};
#else
// this part actually constitutes invalid C++ code, but it allows us to
// convince VC7.1 to do what we want
struct cases
{
template <typename Tag, typename Enable = void>
struct case_
: proto::not_<proto::_>
{};
///////////////////////////////////////////////////////////////////
// terminals
///////////////////////////////////////////////////////////////////
template <>
struct case_<proto::tag::terminal>
: proto::when<
proto::if_<use_terminal<Domain, proto::_value>()>,
detail::make_terminal<Domain>
>
{};
template <typename Tag>
struct case_<Tag>
: proto::or_<
///////////////////////////////////////////////////////////////////
// binary operators
///////////////////////////////////////////////////////////////////
proto::when<proto::binary_expr<
typename enable_if<use_operator<Domain, Tag>, Tag>::type
, meta_grammar, meta_grammar>
, detail::make_binary<Domain, Tag, meta_grammar>
>,
///////////////////////////////////////////////////////////////////
// unary operators
///////////////////////////////////////////////////////////////////
proto::when<proto::unary_expr<
typename enable_if<use_operator<Domain, Tag>, Tag>::type
, meta_grammar>
, detail::make_unary<Domain, Tag, meta_grammar>
>
>
{};
template <>
struct case_<proto::tag::subscript>
: proto::or_<
///////////////////////////////////////////////////////////////////
// directives
///////////////////////////////////////////////////////////////////
proto::when<proto::binary_expr<proto::tag::subscript
, proto::and_<
proto::terminal<proto::_>
, proto::if_<use_directive<Domain, proto::_value >()> >
, meta_grammar>,
detail::make_directive<Domain, meta_grammar>
>,
///////////////////////////////////////////////////////////////////
// semantic actions
///////////////////////////////////////////////////////////////////
proto::when<proto::binary_expr<proto::tag::subscript
, meta_grammar, proto::_>,
detail::make_action<Domain, meta_grammar>
>
>
{};
};
#endif
struct meta_grammar
: proto::switch_<cases>
{};
};
namespace result_of
{
// Default case
template <typename Domain, typename Expr
, typename Modifiers = unused_type, typename Enable = void>
struct compile
{
typedef typename meta_compiler<Domain>::meta_grammar meta_grammar;
typedef typename meta_grammar::
template result<meta_grammar(Expr, mpl::void_, Modifiers)>::type
type;
};
// If Expr is not a proto expression, make it a terminal
template <typename Domain, typename Expr, typename Modifiers>
struct compile<Domain, Expr, Modifiers,
typename disable_if<proto::is_expr<Expr> >::type>
: compile<Domain, typename proto::terminal<Expr>::type, Modifiers> {};
}
namespace traits
{
// Check if Expr matches the domain's grammar
template <typename Domain, typename Expr>
struct matches :
proto::matches<
typename proto::result_of::as_expr<
typename remove_reference<Expr>::type>::type,
typename meta_compiler<Domain>::meta_grammar
>
{
};
}
namespace detail
{
template <typename Domain>
struct compiler
{
// Default case
template <typename Expr, typename Modifiers>
static typename spirit::result_of::compile<Domain, Expr, Modifiers>::type
compile(Expr const& expr, Modifiers modifiers, mpl::true_)
{
typename meta_compiler<Domain>::meta_grammar compiler;
return compiler(expr, mpl::void_(), modifiers);
}
// If Expr is not a proto expression, make it a terminal
template <typename Expr, typename Modifiers>
static typename spirit::result_of::compile<Domain, Expr, Modifiers>::type
compile(Expr const& expr, Modifiers modifiers, mpl::false_)
{
typename meta_compiler<Domain>::meta_grammar compiler;
typedef typename detail::as_meta_element<Expr>::type expr_;
typename proto::terminal<expr_>::type term = {expr};
return compiler(term, mpl::void_(), modifiers);
}
};
}
template <typename Domain, typename Expr>
inline typename result_of::compile<Domain, Expr, unused_type>::type
compile(Expr const& expr)
{
typedef typename proto::is_expr<Expr>::type is_expr;
return detail::compiler<Domain>::compile(expr, unused, is_expr());
}
template <typename Domain, typename Expr, typename Modifiers>
inline typename result_of::compile<Domain, Expr, Modifiers>::type
compile(Expr const& expr, Modifiers modifiers)
{
typedef typename proto::is_expr<Expr>::type is_expr;
return detail::compiler<Domain>::compile(expr, modifiers, is_expr());
}
///////////////////////////////////////////////////////////////////////////
template <typename Elements, template <typename Subject> class generator>
struct make_unary_composite
{
typedef typename
fusion::result_of::value_at_c<Elements, 0>::type
element_type;
typedef generator<element_type> result_type;
result_type operator()(Elements const& elements, unused_type) const
{
return result_type(fusion::at_c<0>(elements));
}
};
template <typename Elements, template <typename Left, typename Right> class generator>
struct make_binary_composite
{
typedef typename
fusion::result_of::value_at_c<Elements, 0>::type
left_type;
typedef typename
fusion::result_of::value_at_c<Elements, 1>::type
right_type;
typedef generator<left_type, right_type> result_type;
result_type operator()(Elements const& elements, unused_type) const
{
return result_type(
fusion::at_c<0>(elements)
, fusion::at_c<1>(elements)
);
}
};
template <typename Elements, template <typename Elements_> class generator>
struct make_nary_composite
{
typedef generator<Elements> result_type;
result_type operator()(Elements const& elements, unused_type) const
{
return result_type(elements);
}
};
}}
#endif
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