/*=============================================================================
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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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#if !defined(BOOST_SPIRIT_STREAM_MAY_05_2007_1228PM)
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#define BOOST_SPIRIT_STREAM_MAY_05_2007_1228PM
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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/detail/string_parse.hpp>
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#include <boost/spirit/home/qi/stream/detail/match_manip.hpp>
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#include <boost/spirit/home/support/detail/hold_any.hpp>
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#include <boost/proto/traits.hpp>
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#include <istream>
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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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template <>
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struct use_terminal<qi::domain, tag::stream> // enables stream
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: mpl::true_ {};
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template <>
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struct use_terminal<qi::domain, tag::wstream> // enables wstream
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: mpl::true_ {};
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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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#ifndef BOOST_SPIRIT_NO_PREDEFINED_TERMINALS
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using spirit::stream;
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using spirit::wstream;
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#endif
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using spirit::stream_type;
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using spirit::wstream_type;
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namespace detail
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{
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template <typename Iterator>
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struct psbuf
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: std::basic_streambuf<typename std::iterator_traits<Iterator>::value_type>
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{
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psbuf(Iterator first_, Iterator const& last_)
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: first(first_), last(last_) {}
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// silence MSVC warning C4512: assignment operator could not be generated
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BOOST_DELETED_FUNCTION(psbuf& operator=(psbuf const&))
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protected:
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typename psbuf::int_type underflow() BOOST_OVERRIDE
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{
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return first == last ? psbuf::traits_type::eof()
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: psbuf::traits_type::to_int_type(*first);
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}
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typename psbuf::int_type uflow() BOOST_OVERRIDE
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{
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return first == last ? psbuf::traits_type::eof()
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: psbuf::traits_type::to_int_type(*first++);
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}
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public:
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Iterator first;
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Iterator const& last;
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};
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}
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template <typename Char = char, typename T = spirit::basic_hold_any<char> >
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struct stream_parser
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: primitive_parser<stream_parser<Char, T> >
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{
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template <typename Context, typename Iterator>
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struct attribute
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{
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typedef T type;
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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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qi::skip_over(first, last, skipper);
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detail::psbuf<Iterator> pseudobuf(first, last);
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std::basic_istream<Char> in(&pseudobuf);
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in >> attr_; // use existing operator>>()
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// advance the iterator if everything is ok
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if (in) {
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first = pseudobuf.first;
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return true;
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}
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return false;
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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("stream");
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}
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};
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template <typename T, typename Char = char>
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struct typed_stream
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: proto::terminal<stream_parser<Char, T> >::type
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{
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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 Char>
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struct make_stream
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{
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typedef stream_parser<Char> result_type;
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result_type operator()(unused_type, unused_type) const
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{
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return result_type();
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}
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};
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template <typename Modifiers>
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struct make_primitive<tag::stream, Modifiers> : make_stream<char> {};
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template <typename Modifiers>
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struct make_primitive<tag::wstream, Modifiers> : make_stream<wchar_t> {};
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}}}
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#endif
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