128 lines
4.3 KiB
C++
128 lines
4.3 KiB
C++
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/*=============================================================================
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Copyright (c) 2001-2011 Joel de Guzman
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Copyright (c) 2001-2011 Hartmut Kaiser
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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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=============================================================================*/
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#ifndef BOOST_SPIRIT_QI_OPERATOR_PLUS_HPP
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#define BOOST_SPIRIT_QI_OPERATOR_PLUS_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/meta_compiler.hpp>
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#include <boost/spirit/home/qi/parser.hpp>
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#include <boost/spirit/home/support/container.hpp>
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#include <boost/spirit/home/qi/detail/attributes.hpp>
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#include <boost/spirit/home/qi/detail/fail_function.hpp>
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#include <boost/spirit/home/qi/detail/pass_container.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/spirit/home/support/info.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<qi::domain, proto::tag::unary_plus> // enables +p
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: mpl::true_ {};
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}}
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namespace boost { namespace spirit { namespace qi
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{
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template <typename Subject>
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struct plus : unary_parser<plus<Subject> >
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{
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typedef Subject subject_type;
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template <typename Context, typename Iterator>
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struct attribute
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{
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// Build a std::vector from the subject's attribute. Note
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// that build_std_vector may return unused_type if the
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// subject's attribute is an unused_type.
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typedef typename
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traits::build_std_vector<
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typename traits::attribute_of<
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Subject, Context, Iterator>::type
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>::type
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type;
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};
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plus(Subject const& subject_)
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: subject(subject_) {}
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template <typename F>
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bool parse_container(F f) const
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{
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// in order to succeed we need to match at least one element
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if (f (subject))
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return false;
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while (!f (subject))
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;
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return true;
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}
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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
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, Attribute& attr_) const
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{
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typedef detail::fail_function<Iterator, Context, Skipper>
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fail_function;
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// ensure the attribute is actually a container type
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traits::make_container(attr_);
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Iterator iter = first;
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fail_function f(iter, last, context, skipper);
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if (!parse_container(detail::make_pass_container(f, attr_)))
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return false;
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first = f.first;
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return true;
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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("plus", 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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// Parser 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::unary_plus, Elements, Modifiers>
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: make_unary_composite<Elements, plus>
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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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///////////////////////////////////////////////////////////////////////////
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template <typename Subject>
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struct has_semantic_action<qi::plus<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<qi::plus<Subject>, Attribute, Context
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, Iterator>
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: mpl::true_ {};
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}}}
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#endif
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