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// 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(SPIRIT_KARMA_OMIT_JUL_20_2009_1008AM)
#define SPIRIT_KARMA_OMIT_JUL_20_2009_1008AM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/karma/meta_compiler.hpp>
#include <boost/spirit/home/karma/generator.hpp>
#include <boost/spirit/home/karma/domain.hpp>
#include <boost/spirit/home/support/unused.hpp>
#include <boost/spirit/home/support/info.hpp>
#include <boost/spirit/home/support/common_terminals.hpp>
#include <boost/spirit/home/support/has_semantic_action.hpp>
#include <boost/spirit/home/support/handles_container.hpp>
#include <boost/spirit/home/karma/detail/attributes.hpp>
namespace boost { namespace spirit
{
///////////////////////////////////////////////////////////////////////////
// Enablers
///////////////////////////////////////////////////////////////////////////
template <>
struct use_directive<karma::domain, tag::omit> // enables omit
: mpl::true_ {};
template <>
struct use_directive<karma::domain, tag::skip> // enables skip
: mpl::true_ {};
}}
namespace boost { namespace spirit { namespace karma
{
#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
using spirit::omit;
using spirit::skip;
#endif
using spirit::omit_type;
using spirit::skip_type;
///////////////////////////////////////////////////////////////////////////
// omit_directive consumes the attribute of subject generator without
// generating anything
///////////////////////////////////////////////////////////////////////////
template <typename Subject, bool Execute>
struct omit_directive : unary_generator<omit_directive<Subject, Execute> >
{
typedef Subject subject_type;
typedef mpl::int_<
generator_properties::disabling | subject_type::properties::value
> properties;
omit_directive(Subject const& subject)
: subject(subject) {}
template <typename Context, typename Iterator = unused_type>
struct attribute
: traits::attribute_of<subject_type, Context, Iterator>
{};
template <typename OutputIterator, typename Context, typename Delimiter
, typename Attribute>
bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d
, Attribute const& attr) const
{
// We need to actually compile the output operation as we don't
// have any other means to verify, whether the passed attribute is
// compatible with the subject.
// omit[] will execute the code, while skip[] doesn't execute it
if (Execute) {
// wrap the given output iterator to avoid output
detail::disable_output<OutputIterator> disable(sink);
subject.generate(sink, ctx, d, attr);
}
return true;
}
template <typename Context>
info what(Context& context) const
{
return info(Execute ? "omit" : "skip", subject.what(context));
}
Subject subject;
};
///////////////////////////////////////////////////////////////////////////
// Generator generators: make_xxx function (objects)
///////////////////////////////////////////////////////////////////////////
template <typename Subject, typename Modifiers>
struct make_directive<tag::omit, Subject, Modifiers>
{
typedef omit_directive<Subject, true> result_type;
result_type operator()(unused_type, Subject const& subject
, unused_type) const
{
return result_type(subject);
}
};
template <typename Subject, typename Modifiers>
struct make_directive<tag::skip, Subject, Modifiers>
{
typedef omit_directive<Subject, false> result_type;
result_type operator()(unused_type, Subject const& subject
, unused_type) const
{
return result_type(subject);
}
};
}}}
namespace boost { namespace spirit { namespace traits
{
///////////////////////////////////////////////////////////////////////////
template <typename Subject, bool Execute>
struct has_semantic_action<karma::omit_directive<Subject, Execute> >
: unary_has_semantic_action<Subject> {};
///////////////////////////////////////////////////////////////////////////
template <typename Subject, bool Execute, typename Attribute
, typename Context, typename Iterator>
struct handles_container<karma::omit_directive<Subject, Execute>, Attribute
, Context, Iterator>
: unary_handles_container<Subject, Attribute, Context, Iterator> {};
}}}
#endif
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