// Copyright (c) 2001-2011 Hartmut Kaiser
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// Copyright (c) 2001-2011 Joel de Guzman
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// Copyright (c) 2003 Vaclav Vesely
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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_REPOSITORY_QI_DIRECTIVE_DISTINCT_HPP
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#define BOOST_SPIRIT_REPOSITORY_QI_DIRECTIVE_DISTINCT_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/qi/skip_over.hpp>
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#include <boost/spirit/home/qi/domain.hpp>
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#include <boost/spirit/home/qi/parser.hpp>
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#include <boost/spirit/home/qi/meta_compiler.hpp>
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#include <boost/spirit/home/qi/detail/unused_skipper.hpp>
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#include <boost/spirit/home/support/common_terminals.hpp>
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#include <boost/spirit/home/support/make_component.hpp>
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#include <boost/spirit/home/support/info.hpp>
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#include <boost/spirit/home/support/unused.hpp>
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#include <boost/spirit/home/qi/detail/attributes.hpp>
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#include <boost/spirit/home/support/string_traits.hpp>
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#include <boost/spirit/home/qi/auxiliary/eps.hpp>
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#include <boost/spirit/home/qi/auxiliary/lazy.hpp>
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#include <boost/spirit/home/qi/directive/lexeme.hpp>
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#include <boost/spirit/home/qi/operator/not_predicate.hpp>
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#include <boost/spirit/repository/home/support/distinct.hpp>
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#include <boost/fusion/include/at.hpp>
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#include <boost/fusion/include/vector.hpp>
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///////////////////////////////////////////////////////////////////////////////
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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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// enables distinct(...)[...]
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template <typename Tail>
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struct use_directive<qi::domain
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, terminal_ex<repository::tag::distinct, fusion::vector1<Tail> > >
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: mpl::true_ {};
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// enables *lazy* distinct(...)[...]
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template <>
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struct use_lazy_directive<qi::domain, repository::tag::distinct, 1>
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: mpl::true_ {};
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}}
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit { namespace repository {namespace qi
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{
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#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
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using repository::distinct;
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#endif
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using repository::distinct_type;
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template <typename Subject, typename Tail, typename Modifier>
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struct distinct_parser
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: spirit::qi::unary_parser<distinct_parser<Subject, Tail, Modifier> >
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{
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template <typename Context, typename Iterator>
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struct attribute
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: traits::attribute_of<Subject, Context, Iterator>
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{};
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distinct_parser(Subject const& subject, Tail const& tail)
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: subject(subject), tail(tail) {}
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template <typename Iterator, typename Context
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, typename Skipper, typename Attribute>
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bool parse(Iterator& first, Iterator const& last
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, Context& context, Skipper const& skipper, Attribute& attr) const
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{
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Iterator iter = first;
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spirit::qi::skip_over(iter, last, skipper);
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if (!subject.parse(iter, last, context
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, spirit::qi::detail::unused_skipper<Skipper>(skipper), attr))
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return false;
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Iterator i = iter;
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if (tail.parse(i, last, context, unused, unused))
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return false;
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first = iter;
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return true;
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}
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template <typename Context>
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info what(Context& /*ctx*/) const
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{
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return info("distinct");
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}
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Subject subject;
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Tail tail;
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};
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}}}}
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///////////////////////////////////////////////////////////////////////////////
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namespace boost { namespace spirit { namespace qi
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{
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///////////////////////////////////////////////////////////////////////////
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// Parser generators: make_xxx function (objects)
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///////////////////////////////////////////////////////////////////////////
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template <typename Tail, typename Subject, typename Modifiers>
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struct make_directive<
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terminal_ex<repository::tag::distinct, fusion::vector1<Tail> >
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, Subject, Modifiers>
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{
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typedef typename result_of::compile<qi::domain, Tail, Modifiers>::type
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tail_type;
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typedef repository::qi::distinct_parser<
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Subject, tail_type, Modifiers> result_type;
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template <typename Terminal>
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result_type operator()(Terminal const& term, Subject const& subject
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, Modifiers const& modifiers) const
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{
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return result_type(subject
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, compile<qi::domain>(fusion::at_c<0>(term.args), modifiers));
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}
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};
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}}}
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namespace boost { namespace spirit { namespace traits
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{
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template <typename Subject, typename Tail, typename Modifier>
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struct has_semantic_action<
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repository::qi::distinct_parser<Subject, Tail, Modifier> >
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: unary_has_semantic_action<Subject> {};
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}}}
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#endif
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