/*============================================================================= | |
Copyright (c) 2001-2011 Joel de Guzman | |
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(SPIRIT_KLEENE_JANUARY_07_2007_0818AM) | |
#define SPIRIT_KLEENE_JANUARY_07_2007_0818AM | |
#if defined(_MSC_VER) | |
#pragma once | |
#endif | |
#include <boost/spirit/home/qi/meta_compiler.hpp> | |
#include <boost/spirit/home/qi/parser.hpp> | |
#include <boost/spirit/home/support/container.hpp> | |
#include <boost/spirit/home/qi/detail/attributes.hpp> | |
#include <boost/spirit/home/support/has_semantic_action.hpp> | |
#include <boost/spirit/home/support/handles_container.hpp> | |
#include <boost/spirit/home/support/info.hpp> | |
namespace boost { namespace spirit | |
{ | |
/////////////////////////////////////////////////////////////////////////// | |
// Enablers | |
/////////////////////////////////////////////////////////////////////////// | |
//[composite_parsers_kleene_enable_ | |
template <> | |
struct use_operator<qi::domain, proto::tag::dereference> // enables *p | |
: mpl::true_ {}; | |
//] | |
}} | |
namespace boost { namespace spirit { namespace qi | |
{ | |
//[composite_parsers_kleene | |
template <typename Subject> | |
struct kleene : unary_parser<kleene<Subject> > | |
{ | |
typedef Subject subject_type; | |
template <typename Context, typename Iterator> | |
struct attribute | |
{ | |
// Build a std::vector from the subject's attribute. Note | |
// that build_std_vector may return unused_type if the | |
// subject's attribute is an unused_type. | |
typedef typename | |
traits::build_std_vector< | |
typename traits:: | |
attribute_of<Subject, Context, Iterator>::type | |
>::type | |
type; | |
}; | |
kleene(Subject const& subject) | |
: subject(subject) {} | |
template <typename Iterator, typename Context | |
, typename Skipper, typename Attribute> | |
bool parse(Iterator& first, Iterator const& last | |
, Context& context, Skipper const& skipper | |
, Attribute& attr) const | |
{ | |
// create a local value if Attribute is not unused_type | |
typedef typename traits::container_value<Attribute>::type | |
value_type; | |
value_type val = value_type(); | |
// ensure the attribute is actually a container type | |
traits::make_container(attr); | |
// Repeat while subject parses ok | |
Iterator save = first; | |
while (subject.parse(save, last, context, skipper, val) && | |
traits::push_back(attr, val)) // push the parsed value into our attribute | |
{ | |
first = save; | |
traits::clear(val); | |
} | |
return true; | |
} | |
template <typename Context> | |
info what(Context& context) const | |
{ | |
return info("kleene", subject.what(context)); | |
} | |
Subject subject; | |
}; | |
//] | |
/////////////////////////////////////////////////////////////////////////// | |
// Parser generators: make_xxx function (objects) | |
/////////////////////////////////////////////////////////////////////////// | |
//[composite_parsers_kleene_generator | |
template <typename Elements, typename Modifiers> | |
struct make_composite<proto::tag::dereference, Elements, Modifiers> | |
: make_unary_composite<Elements, kleene> | |
{}; | |
//] | |
// /////////////////////////////////////////////////////////////////////////// | |
// // Define what attributes are compatible with a kleene | |
// template <typename Attribute, typename Subject, typename Context, typename Iterator> | |
// struct is_attribute_compatible<Attribute, kleene<Subject>, Context, Iterator> | |
// : traits::is_container_compatible<qi::domain, Attribute | |
// , kleene<Subject>, Context, Iterator> | |
// {}; | |
}}} | |
namespace boost { namespace spirit { namespace traits | |
{ | |
/////////////////////////////////////////////////////////////////////////// | |
template <typename Subject> | |
struct has_semantic_action<qi::kleene<Subject> > | |
: unary_has_semantic_action<Subject> {}; | |
/////////////////////////////////////////////////////////////////////////// | |
template <typename Subject, typename Attribute, typename Context | |
, typename Iterator> | |
struct handles_container<qi::kleene<Subject>, Attribute | |
, Context, Iterator> | |
: mpl::true_ {}; | |
}}} | |
#endif |