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65 lines
1.8 KiB
C++
Executable File
65 lines
1.8 KiB
C++
Executable File
// (C) Copyright Jonathan Turkanis 2003.
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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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//
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// Demonstrates the use of tab_expanding_output_filter.
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//
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#include <iostream>
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#include <boost/iostreams/filtering_stream.hpp>
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#include "tab_expanding_output_filter.hpp"
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void test_tab_expanding()
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{
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using namespace std;
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using namespace boost::iostreams;
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using namespace boost::iostreams::example;
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const char* code =
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"class tab_expanding_output_filter : public output_filter {\n"
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"public:\n"
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"\texplicit tab_expanding_output_filter(int tab_size = 8)\n"
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"\t\t: tab_size_(tab_size), col_no_(0)\n"
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"\t\t{ assert(tab_size > 0); }\n\n"
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"\ttemplate<typename Sink>\n"
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"\tvoid put(Sink& dest, int c)\n"
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"\t\t{\n"
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"\t\t\tif (c == '\\t') {\n"
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"\t\t\t\tdo {\n"
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"\t\t\t\t\tthis->put(dest, ' ');\n"
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"\t\t\t\t} while(col_no_ % tab_size_ != 0);\n"
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"\t\t\t} else {\n"
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"\t\t\t\tboost::iostreams::put(dest, c);\n"
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"\t\t\t\tif (c == '\\n')\n"
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"\t\t\t\t\tcol_no_ = 0;\n"
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"\t\t\t\telse\n"
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"\t\t\t\t\t++col_no_;\n"
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"\t\t\t}\n"
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"\t\t}\n"
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"\ttemplate<typename Sink>\n"
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"\tvoid close(Sink&) { col_no_ = 0; }\n"
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"private:\n"
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"\tint\ttab_size_;\n"
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"\tint\tcol_no_;\n"
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"};\n";
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filtering_ostream out;
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out.push(tab_expanding_output_filter(4));
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out.push(cout);
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// Print unfiltered code.
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cout << "**** Code with tabs ****\n\n" << code << "\n\n";
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// Print filtered code:
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out << "**** Code with tabs replaced ****\n\n" << code << "\n\n";
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}
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int main()
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{
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test_tab_expanding();
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return 0;
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}
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