// Copyright (c) 2001-2011 Hartmut Kaiser
|
// 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)
|
|
#ifndef BOOST_SPIRIT_KARMA_OPERATOR_LIST_HPP
|
#define BOOST_SPIRIT_KARMA_OPERATOR_LIST_HPP
|
|
#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>
|
|
namespace boost { namespace spirit
|
{
|
///////////////////////////////////////////////////////////////////////////
|
// Enablers
|
///////////////////////////////////////////////////////////////////////////
|
template <>
|
struct use_operator<karma::domain, proto::tag::modulus> // enables g % d
|
: mpl::true_ {};
|
}}
|
|
///////////////////////////////////////////////////////////////////////////////
|
namespace boost { namespace spirit { namespace karma
|
{
|
template <typename Left, typename Right, typename Strict, typename Derived>
|
struct base_list : binary_generator<Derived>
|
{
|
private:
|
// iterate over the given container until its exhausted or the embedded
|
// (left) generator succeeds
|
template <typename F, typename Attribute>
|
bool generate_left(F f, Attribute const&, mpl::false_) const
|
{
|
// Failing subject generators are just skipped. This allows to
|
// selectively generate items in the provided attribute.
|
while (!f.is_at_end())
|
{
|
bool r = !f(left);
|
if (r)
|
return true;
|
if (!f.is_at_end())
|
f.next();
|
}
|
return false;
|
}
|
|
template <typename F, typename Attribute>
|
bool generate_left(F f, Attribute const&, mpl::true_) const
|
{
|
return !f(left);
|
}
|
|
// 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_left(F f, unused_type, mpl::false_) const
|
{
|
return !f(left);
|
}
|
|
public:
|
typedef Left left_type;
|
typedef Right right_type;
|
|
typedef mpl::int_<
|
left_type::properties::value
|
| right_type::properties::value
|
| generator_properties::buffering
|
| generator_properties::counting
|
> properties;
|
|
// Build a std::vector from the LHS'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<Left, Context, Iterator>::type>
|
{};
|
|
base_list(Left const& left, Right const& right)
|
: left(left), right(right)
|
{}
|
|
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));
|
|
if (generate_left(pass, attr, Strict()))
|
{
|
while (!pass.is_at_end())
|
{
|
// wrap the given output iterator as generate_left might fail
|
detail::enable_buffering<OutputIterator> buffering(sink);
|
{
|
detail::disable_counting<OutputIterator> nocounting(sink);
|
|
if (!right.generate(sink, ctx, d, unused))
|
return false; // shouldn't happen
|
|
if (!generate_left(pass, attr, Strict()))
|
break; // return true as one item succeeded
|
}
|
buffering.buffer_copy();
|
}
|
return detail::sink_is_good(sink);
|
}
|
return false;
|
}
|
|
template <typename Context>
|
info what(Context& context) const
|
{
|
return info("list",
|
std::make_pair(left.what(context), right.what(context)));
|
}
|
|
Left left;
|
Right right;
|
};
|
|
template <typename Left, typename Right>
|
struct list
|
: base_list<Left, Right, mpl::false_, list<Left, Right> >
|
{
|
typedef base_list<Left, Right, mpl::false_, list> base_list_;
|
|
list(Left const& left, Right const& right)
|
: base_list_(left, right) {}
|
};
|
|
template <typename Left, typename Right>
|
struct strict_list
|
: base_list<Left, Right, mpl::true_, strict_list<Left, Right> >
|
{
|
typedef base_list<Left, Right, mpl::true_, strict_list> base_list_;
|
|
strict_list (Left const& left, Right const& right)
|
: base_list_(left, right) {}
|
};
|
|
///////////////////////////////////////////////////////////////////////////
|
// Generator generators: make_xxx function (objects)
|
///////////////////////////////////////////////////////////////////////////
|
namespace detail
|
{
|
template <typename Subject, bool strict_mode = false>
|
struct make_list
|
: make_binary_composite<Subject, list>
|
{};
|
|
template <typename Subject>
|
struct make_list<Subject, true>
|
: make_binary_composite<Subject, strict_list>
|
{};
|
}
|
|
template <typename Subject, typename Modifiers>
|
struct make_composite<proto::tag::modulus, Subject, Modifiers>
|
: detail::make_list<Subject, detail::get_stricttag<Modifiers>::value>
|
{};
|
}}}
|
|
namespace boost { namespace spirit { namespace traits
|
{
|
///////////////////////////////////////////////////////////////////////////
|
template <typename Left, typename Right>
|
struct has_semantic_action<karma::list<Left, Right> >
|
: binary_has_semantic_action<Left, Right> {};
|
|
template <typename Left, typename Right>
|
struct has_semantic_action<karma::strict_list<Left, Right> >
|
: binary_has_semantic_action<Left, Right> {};
|
|
///////////////////////////////////////////////////////////////////////////
|
template <typename Left, typename Right, typename Attribute
|
, typename Context, typename Iterator>
|
struct handles_container<karma::list<Left, Right>, Attribute
|
, Context, Iterator>
|
: mpl::true_ {};
|
|
template <typename Left, typename Right, typename Attribute
|
, typename Context, typename Iterator>
|
struct handles_container<karma::strict_list<Left, Right>, Attribute
|
, Context, Iterator>
|
: mpl::true_ {};
|
}}}
|
|
#endif
|
