// Copyright (c) 2001-2011 Hartmut Kaiser
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// Copyright (c) 2001-2011 Joel de Guzman
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//
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_SPIRIT_KARMA_OPERATOR_NOT_PREDICATE_HPP
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#define BOOST_SPIRIT_KARMA_OPERATOR_NOT_PREDICATE_HPP
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#if defined(_MSC_VER)
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#pragma once
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#endif
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#include <boost/spirit/home/karma/domain.hpp>
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#include <boost/spirit/home/karma/meta_compiler.hpp>
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#include <boost/spirit/home/karma/generator.hpp>
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#include <boost/spirit/home/karma/detail/output_iterator.hpp>
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#include <boost/spirit/home/karma/detail/attributes.hpp>
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#include <boost/spirit/home/support/info.hpp>
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#include <boost/spirit/home/support/has_semantic_action.hpp>
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#include <boost/spirit/home/support/handles_container.hpp>
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#include <boost/proto/operators.hpp>
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#include <boost/proto/tags.hpp>
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namespace boost { namespace spirit
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{
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///////////////////////////////////////////////////////////////////////////
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// Enablers
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///////////////////////////////////////////////////////////////////////////
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template <>
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struct use_operator<karma::domain, proto::tag::logical_not> // enables !g
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: mpl::true_ {};
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}}
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namespace boost { namespace spirit { namespace karma
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{
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template <typename Subject>
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struct not_predicate : unary_generator<not_predicate<Subject> >
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{
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typedef Subject subject_type;
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typedef mpl::int_<
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generator_properties::disabling | subject_type::properties::value
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> properties;
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template <typename Context, typename Iterator>
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struct attribute
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: traits::attribute_of<subject_type, Context, Iterator>
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{};
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not_predicate(Subject const& subject)
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: subject(subject) {}
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template <
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typename OutputIterator, typename Context, typename Delimiter
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, typename Attribute>
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bool generate(OutputIterator& sink, Context& ctx, Delimiter const& d
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, Attribute const& attr) const
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{
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// inhibits output
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detail::disable_output<OutputIterator> disable(sink);
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return !subject.generate(sink, ctx, d, attr);
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}
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template <typename Context>
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info what(Context& context) const
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{
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return info("not-predicate", subject.what(context));
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}
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Subject subject;
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};
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///////////////////////////////////////////////////////////////////////////
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// Generator generators: make_xxx function (objects)
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///////////////////////////////////////////////////////////////////////////
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template <typename Elements, typename Modifiers>
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struct make_composite<proto::tag::logical_not, Elements, Modifiers>
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: make_unary_composite<Elements, not_predicate> {};
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}}}
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namespace boost { namespace spirit { namespace traits
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{
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///////////////////////////////////////////////////////////////////////////
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template <typename Subject>
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struct has_semantic_action<karma::not_predicate<Subject> >
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: unary_has_semantic_action<Subject> {};
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///////////////////////////////////////////////////////////////////////////
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template <typename Subject, typename Attribute, typename Context
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, typename Iterator>
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struct handles_container<karma::not_predicate<Subject>, Attribute
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, Context, Iterator>
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: unary_handles_container<Subject, Attribute, Context, Iterator> {};
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}}}
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#endif
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