// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2005-2007 Jonathan Turkanis
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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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// See http://www.boost.org/libs/iostreams for documentation.
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// Based on the work of Christopher Diggins.
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#ifndef BOOST_IOSTREAMS_STDIO_FILTER_HPP_INCLUDED
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#define BOOST_IOSTREAMS_STDIO_FILTER_HPP_INCLUDED
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <iostream>
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#include <memory> // allocator.
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#include <vector>
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#include <boost/iostreams/detail/config/wide_streams.hpp>
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#include <boost/iostreams/detail/char_traits.hpp>
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#include <boost/iostreams/detail/ios.hpp>
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#include <boost/iostreams/device/array.hpp>
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#include <boost/iostreams/device/back_inserter.hpp>
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#include <boost/iostreams/filter/aggregate.hpp>
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#include <boost/iostreams/pipeline.hpp>
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#include <boost/iostreams/stream_buffer.hpp>
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namespace boost { namespace iostreams {
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namespace detail {
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} // End namespace detail.
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template<typename Ch, typename Alloc = std::allocator<Ch> >
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class basic_stdio_filter : public aggregate_filter<Ch, Alloc> {
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private:
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typedef aggregate_filter<Ch, Alloc> base_type;
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public:
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typedef typename base_type::char_type char_type;
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typedef typename base_type::category category;
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typedef typename base_type::vector_type vector_type;
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private:
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static std::istream& standard_input(char*) { return std::cin; }
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static std::ostream& standard_output(char*) { return std::cout; }
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#ifndef BOOST_IOSTREAMS_NO_WIDE_STREAMS
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static std::wistream& standard_input(wchar_t*) { return std::wcin; }
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static std::wostream& standard_output(wchar_t*) { return std::wcout; }
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#endif // BOOST_IOSTREAMS_NO_WIDE_STREAMS
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struct scoped_redirector { // Thanks to Maxim Egorushkin.
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typedef BOOST_IOSTREAMS_CHAR_TRAITS(Ch) traits_type;
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typedef BOOST_IOSTREAMS_BASIC_IOS(Ch, traits_type) ios_type;
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typedef BOOST_IOSTREAMS_BASIC_STREAMBUF(Ch, traits_type) streambuf_type;
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scoped_redirector( ios_type& ios,
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streambuf_type* newbuf )
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: ios_(ios), old_(ios.rdbuf(newbuf))
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{ }
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~scoped_redirector() { ios_.rdbuf(old_); }
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scoped_redirector& operator=(const scoped_redirector&);
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ios_type& ios_;
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streambuf_type* old_;
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};
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virtual void do_filter() = 0;
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virtual void do_filter(const vector_type& src, vector_type& dest)
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{
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stream_buffer< basic_array_source<Ch> >
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srcbuf(&src[0], &src[0] + src.size());
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stream_buffer< back_insert_device<vector_type> >
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destbuf(iostreams::back_inserter(dest));
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scoped_redirector redirect_input(standard_input((Ch*)0), &srcbuf);
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scoped_redirector redirect_output(standard_output((Ch*)0), &destbuf);
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do_filter();
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}
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};
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BOOST_IOSTREAMS_PIPABLE(basic_stdio_filter, 2)
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typedef basic_stdio_filter<char> stdio_filter;
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typedef basic_stdio_filter<wchar_t> wstdio_wfilter;
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} } // End namespaces iostreams, boost.
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#endif // #ifndef BOOST_IOSTREAMS_STDIO_FILTER_HPP_INCLUDED
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