// Copyright (c) 2001-2011 Joel de Guzman
|
// Copyright (c) 2001-2011 Hartmut Kaiser
|
//
|
// 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(BOOST_SPIRIT_KARMA_KLEENE_MAR_03_2007_0337AM)
|
#define BOOST_SPIRIT_KARMA_KLEENE_MAR_03_2007_0337AM
|
|
#if defined(_MSC_VER)
|
#pragma once
|
#endif
|
|
#include <boost/spirit/home/karma/domain.hpp>
|
#include <boost/spirit/home/karma/generator.hpp>
|
#include <boost/spirit/home/karma/meta_compiler.hpp>
|
#include <boost/spirit/home/karma/detail/output_iterator.hpp>
|
#include <boost/spirit/home/karma/detail/indirect_iterator.hpp>
|
#include <boost/spirit/home/karma/detail/get_stricttag.hpp>
|
#include <boost/spirit/home/karma/detail/pass_container.hpp>
|
#include <boost/spirit/home/karma/detail/fail_function.hpp>
|
#include <boost/spirit/home/support/info.hpp>
|
#include <boost/spirit/home/support/unused.hpp>
|
#include <boost/spirit/home/support/container.hpp>
|
#include <boost/spirit/home/support/handles_container.hpp>
|
#include <boost/spirit/home/karma/detail/attributes.hpp>
|
#include <boost/proto/operators.hpp>
|
#include <boost/proto/tags.hpp>
|
#include <boost/type_traits/add_const.hpp>
|
|
namespace boost { namespace spirit
|
{
|
///////////////////////////////////////////////////////////////////////////
|
// Enablers
|
///////////////////////////////////////////////////////////////////////////
|
template <>
|
struct use_operator<karma::domain, proto::tag::dereference> // enables *g
|
: mpl::true_ {};
|
}}
|
|
///////////////////////////////////////////////////////////////////////////////
|
namespace boost { namespace spirit { namespace karma
|
{
|
template <typename Subject, typename Strict, typename Derived>
|
struct base_kleene : unary_generator<Derived>
|
{
|
private:
|
// Ignore return value in relaxed mode (failing subject generators
|
// are just skipped). This allows to selectively generate items in
|
// the provided attribute.
|
template <typename F, typename Attribute>
|
bool generate_subject(F f, Attribute const&, mpl::false_) const
|
{
|
bool r = !f(subject);
|
if (!r && !f.is_at_end())
|
f.next();
|
return true;
|
}
|
|
template <typename F, typename Attribute>
|
bool generate_subject(F f, Attribute const&, mpl::true_) const
|
{
|
return !f(subject);
|
}
|
|
// There is no way to distinguish a failed generator from a
|
// generator to be skipped. We assume the user takes responsibility
|
// for ending the loop if no attribute is specified.
|
template <typename F>
|
bool generate_subject(F f, unused_type, mpl::false_) const
|
{
|
return !f(subject);
|
}
|
|
// template <typename F>
|
// bool generate_subject(F f, unused_type, mpl::true_) const
|
// {
|
// return !f(subject);
|
// }
|
|
public:
|
typedef Subject subject_type;
|
typedef typename subject_type::properties properties;
|
|
// 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.
|
template <typename Context, typename Iterator>
|
struct attribute
|
: traits::build_std_vector<
|
typename traits::attribute_of<Subject, Context, Iterator>::type
|
>
|
{};
|
|
base_kleene(Subject const& subject)
|
: subject(subject) {}
|
|
template <
|
typename OutputIterator, typename Context, typename Delimiter
|
, typename Attribute>
|
bool generate(OutputIterator& sink, Context& ctx
|
, Delimiter const& d, Attribute const& attr) const
|
{
|
typedef detail::fail_function<
|
OutputIterator, Context, Delimiter> fail_function;
|
|
typedef typename traits::container_iterator<
|
typename add_const<Attribute>::type
|
>::type iterator_type;
|
|
typedef
|
typename traits::make_indirect_iterator<iterator_type>::type
|
indirect_iterator_type;
|
typedef detail::pass_container<
|
fail_function, Attribute, indirect_iterator_type, mpl::false_>
|
pass_container;
|
|
iterator_type it = traits::begin(attr);
|
iterator_type end = traits::end(attr);
|
|
pass_container pass(fail_function(sink, ctx, d),
|
indirect_iterator_type(it), indirect_iterator_type(end));
|
|
// kleene fails only if the underlying output fails
|
while (!pass.is_at_end())
|
{
|
if (!generate_subject(pass, attr, Strict()))
|
break;
|
}
|
return detail::sink_is_good(sink);
|
}
|
|
template <typename Context>
|
info what(Context& context) const
|
{
|
return info("kleene", subject.what(context));
|
}
|
|
Subject subject;
|
};
|
|
template <typename Subject>
|
struct kleene
|
: base_kleene<Subject, mpl::false_, kleene<Subject> >
|
{
|
typedef base_kleene<Subject, mpl::false_, kleene> base_kleene_;
|
|
kleene(Subject const& subject)
|
: base_kleene_(subject) {}
|
};
|
|
template <typename Subject>
|
struct strict_kleene
|
: base_kleene<Subject, mpl::true_, strict_kleene<Subject> >
|
{
|
typedef base_kleene<Subject, mpl::true_, strict_kleene> base_kleene_;
|
|
strict_kleene(Subject const& subject)
|
: base_kleene_(subject) {}
|
};
|
|
///////////////////////////////////////////////////////////////////////////
|
// Generator generators: make_xxx function (objects)
|
///////////////////////////////////////////////////////////////////////////
|
namespace detail
|
{
|
template <typename Subject, bool strict_mode = false>
|
struct make_kleene
|
: make_unary_composite<Subject, kleene>
|
{};
|
|
template <typename Subject>
|
struct make_kleene<Subject, true>
|
: make_unary_composite<Subject, strict_kleene>
|
{};
|
}
|
|
template <typename Subject, typename Modifiers>
|
struct make_composite<proto::tag::dereference, Subject, Modifiers>
|
: detail::make_kleene<Subject, detail::get_stricttag<Modifiers>::value>
|
{};
|
}}}
|
|
namespace boost { namespace spirit { namespace traits
|
{
|
///////////////////////////////////////////////////////////////////////////
|
template <typename Subject>
|
struct has_semantic_action<karma::kleene<Subject> >
|
: unary_has_semantic_action<Subject> {};
|
|
template <typename Subject>
|
struct has_semantic_action<karma::strict_kleene<Subject> >
|
: unary_has_semantic_action<Subject> {};
|
|
///////////////////////////////////////////////////////////////////////////
|
template <typename Subject, typename Attribute, typename Context
|
, typename Iterator>
|
struct handles_container<karma::kleene<Subject>, Attribute
|
, Context, Iterator>
|
: mpl::true_ {};
|
|
template <typename Subject, typename Attribute, typename Context
|
, typename Iterator>
|
struct handles_container<karma::strict_kleene<Subject>, Attribute
|
, Context, Iterator>
|
: mpl::true_ {};
|
}}}
|
|
#endif
|
