/*============================================================================= | |
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_SEQUENCE_BASE_APRIL_22_2006_0811AM) | |
#define SPIRIT_SEQUENCE_BASE_APRIL_22_2006_0811AM | |
#if defined(_MSC_VER) | |
#pragma once | |
#endif | |
#include <boost/spirit/home/qi/domain.hpp> | |
#include <boost/spirit/home/qi/detail/pass_container.hpp> | |
#include <boost/spirit/home/qi/detail/attributes.hpp> | |
#include <boost/spirit/home/support/algorithm/any_if.hpp> | |
#include <boost/spirit/home/support/detail/what_function.hpp> | |
#include <boost/spirit/home/support/unused.hpp> | |
#include <boost/spirit/home/support/info.hpp> | |
#include <boost/spirit/home/support/sequence_base_id.hpp> | |
#include <boost/spirit/home/support/has_semantic_action.hpp> | |
#include <boost/spirit/home/qi/parser.hpp> | |
#include <boost/fusion/include/as_vector.hpp> | |
#include <boost/fusion/include/vector.hpp> | |
#include <boost/fusion/include/for_each.hpp> | |
#include <boost/mpl/identity.hpp> | |
namespace boost { namespace spirit { namespace qi | |
{ | |
template <typename Derived, typename Elements> | |
struct sequence_base // this class is shared by sequence and expect | |
: nary_parser<Derived> | |
{ | |
typedef Elements elements_type; | |
struct sequence_base_id; | |
template <typename Context, typename Iterator> | |
struct attribute | |
{ | |
// Put all the element attributes in a tuple | |
typedef typename traits::build_attribute_sequence< | |
Elements, Context, traits::sequence_attribute_transform | |
, Iterator, qi::domain | |
>::type all_attributes; | |
// Now, build a fusion vector over the attributes. Note | |
// that build_fusion_vector 1) removes all unused attributes | |
// and 2) may return unused_type if all elements have | |
// unused_type(s). | |
typedef typename | |
traits::build_fusion_vector<all_attributes>::type | |
type_; | |
// Finally, strip single element vectors into its | |
// naked form: vector1<T> --> T | |
typedef typename | |
traits::strip_single_element_vector<type_>::type | |
type; | |
}; | |
sequence_base(Elements const& elements) | |
: elements(elements) {} | |
// standard case. Attribute is a fusion tuple | |
template <typename Iterator, typename Context | |
, typename Skipper, typename Attribute> | |
bool parse_impl(Iterator& first, Iterator const& last | |
, Context& context, Skipper const& skipper | |
, Attribute& attr_, mpl::false_) const | |
{ | |
Iterator iter = first; | |
typedef traits::attribute_not_unused<Context, Iterator> predicate; | |
// wrap the attribute in a tuple if it is not a tuple or if the | |
// attribute of this sequence is a single element tuple | |
typedef typename attribute<Context, Iterator>::type_ attr_type_; | |
typename traits::wrap_if_not_tuple<Attribute | |
, typename mpl::and_< | |
traits::one_element_sequence<attr_type_> | |
, mpl::not_<traits::one_element_sequence<Attribute> > | |
>::type | |
>::type attr(attr_); | |
// return false if *any* of the parsers fail | |
if (spirit::any_if(elements, attr | |
, Derived::fail_function(iter, last, context, skipper), predicate())) | |
return false; | |
first = iter; | |
return true; | |
} | |
// Special case when Attribute is an stl container | |
template <typename Iterator, typename Context | |
, typename Skipper, typename Attribute> | |
bool parse_impl(Iterator& first, Iterator const& last | |
, Context& context, Skipper const& skipper | |
, Attribute& attr_, mpl::true_) const | |
{ | |
// ensure the attribute is actually a container type | |
traits::make_container(attr_); | |
Iterator iter = first; | |
// return false if *any* of the parsers fail | |
if (fusion::any(elements | |
, detail::make_pass_container( | |
Derived::fail_function(iter, last, context, skipper), attr_)) | |
) | |
return false; | |
first = iter; | |
return true; | |
} | |
// main parse function. Dispatches to parse_impl depending | |
// on the Attribute type. | |
template <typename Iterator, typename Context | |
, typename Skipper, typename Attribute> | |
bool parse(Iterator& first, Iterator const& last | |
, Context& context, Skipper const& skipper | |
, Attribute& attr) const | |
{ | |
return parse_impl(first, last, context, skipper, attr | |
, traits::is_container<Attribute>()); | |
} | |
template <typename Context> | |
info what(Context& context) const | |
{ | |
info result(this->derived().id()); | |
fusion::for_each(elements, | |
spirit::detail::what_function<Context>(result, context)); | |
return result; | |
} | |
Elements elements; | |
}; | |
}}} | |
#endif |