[857] | 1 | // (C) Copyright Jonathan Turkanis 2005.
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See accompanying
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| 3 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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| 4 |
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| 5 | // See http://www.boost.org/libs/iostreams for documentation.
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| 6 |
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| 7 | #ifndef BOOST_IOSTREAMS_COUNTER_HPP_INCLUDED
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| 8 | #define BOOST_IOSTREAMS_COUNTER_HPP_INCLUDED
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| 9 |
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| 10 | #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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| 11 | # pragma once
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| 12 | #endif
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| 13 |
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| 14 | #include <algorithm> // count.
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| 15 | #include <boost/iostreams/categories.hpp>
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| 16 | #include <boost/iostreams/char_traits.hpp>
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| 17 | #include <boost/iostreams/operations.hpp>
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| 18 | #include <boost/iostreams/pipeline.hpp>
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| 19 |
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| 20 | // Must come last.
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| 21 | #include <boost/iostreams/detail/config/disable_warnings.hpp> // VC7.1 C4244.
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| 22 |
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| 23 | namespace boost { namespace iostreams {
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| 24 |
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| 25 | //
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| 26 | // Template name: basic_counter.
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| 27 | // Template paramters:
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| 28 | // Ch - The character type.
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| 29 | // Description: Filter which counts lines and characters.
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| 30 | //
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| 31 | template<typename Ch>
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| 32 | class basic_counter {
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| 33 | public:
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| 34 | typedef Ch char_type;
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| 35 | struct category
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| 36 | : dual_use,
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| 37 | filter_tag,
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| 38 | multichar_tag,
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| 39 | optimally_buffered_tag
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| 40 | { };
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| 41 | explicit basic_counter(int first_line = 0, int first_char = 0)
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| 42 | : lines_(first_line), chars_(first_char)
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| 43 | { }
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| 44 | int lines() const { return lines_; }
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| 45 | int characters() const { return chars_; }
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| 46 | std::streamsize optimal_buffer_size() const { return 0; }
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| 47 |
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| 48 | template<typename Source>
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| 49 | std::streamsize read(Source& src, char_type* s, std::streamsize n)
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| 50 | {
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| 51 | std::streamsize result = iostreams::read(src, s, n);
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| 52 | if (result == -1)
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| 53 | return -1;
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| 54 | lines_ += std::count(s, s + result, char_traits<Ch>::newline());
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| 55 | chars_ += result;
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| 56 | return result;
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| 57 | }
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| 58 |
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| 59 | template<typename Sink>
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| 60 | std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
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| 61 | {
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| 62 | std::streamsize result = iostreams::write(snk, s, n);
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| 63 | lines_ += std::count(s, s + result, char_traits<Ch>::newline());
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| 64 | chars_ += result;
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| 65 | return result;
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| 66 | }
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| 67 | private:
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| 68 | int lines_;
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| 69 | int chars_;
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| 70 | };
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| 71 | BOOST_IOSTREAMS_PIPABLE(basic_counter, 1)
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| 72 |
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| 73 |
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| 74 | typedef basic_counter<char> counter;
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| 75 | typedef basic_counter<wchar_t> wcounter;
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| 76 |
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| 77 | } } // End namespaces iostreams, boost.
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| 78 |
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| 79 | #include <boost/iostreams/detail/config/enable_warnings.hpp>
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| 80 |
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| 81 | #endif // #ifndef BOOST_IOSTREAMS_COUNTER_HPP_INCLUDED
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