initial commitment

[SVN r26900]

example/regex_example.cpp

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+// (C) Copyright Jonathan Turkanis 2003.
+// Distributed under the Boost Software License, Version 1.0. (See accompanying
+// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
+
+// See http://www.boost.org/libs/iostreams for documentation.
+
+#include <iostream>
+#include <boost/iostreams/filtering_stream.hpp>
+#include <boost/iostreams/filter/regex_filter.hpp>
+
+//
+// Demonstrates the use of regex_output_filter to remove C- and C++-style
+// comments (without regard to quotation marks or line continuations).
+//
+
+void test_regex()
+{
+    using namespace std;
+    using namespace boost;
+    using namespace boost::iostreams;
+
+    string code = // From regex_format.hpp
+        "/*\n"
+        " *\n"
+        " * Copyright (c) 1998-2002\n"
+        " * Dr John Maddock\n"
+        " *\n"
+        " * Permission to use, copy, modify, distribute and sell this software\n"
+        " * and its documentation for any purpose is hereby granted without fee,\n"
+        " * provided that the above copyright notice appear in all copies and\n"
+        " * that both that copyright notice and this permission notice appear\n"
+        " * in supporting documentation.  Dr John Maddock makes no representations\n"
+        " * about the suitability of this software for any purpose.\n"
+        " * It is provided \"as is\" without express or implied warranty.\n"
+        " *\n"
+        " */\n"
+        "\n"
+        " /*\n"
+        "  *   LOCATION:    see http://www.boost.org for most recent version.\n"
+        "  *   FILE         regex_format.hpp\n"
+        "  *   VERSION      see <boost/version.hpp>\n"
+        "  *   DESCRIPTION: Provides formatting output routines for search and replace\n"
+        "  *                operations.  Note this is an internal header file included\n"
+        "  *                by regex.hpp, do not include on its own.\n"
+        "  */\n"
+        "\n"
+        "#ifndef BOOST_REGEX_FORMAT_HPP\n"
+        "#define BOOST_REGEX_FORMAT_HPP\n"
+        "\n"
+        "\n"
+        "namespace boost{\n"
+        "\n"
+        "enum format_flags_t{\n"
+        "   format_all = 0,                      // enable all extentions to sytax\n"
+        "   format_sed = match_max << 1,         // sed style replacement.\n"
+        "   format_perl = format_sed << 1,       // perl style replacement.\n"
+        "   format_no_copy = format_perl << 1,   // don't copy non-matching segments.\n"
+        "   format_first_only = format_no_copy << 1,   // Only replace first occurance.\n"
+        "   format_is_if = format_first_only << 1   // internal use only.\n"
+        "};\n";
+
+    filtering_ostream out;
+    regex pattern("(/\\*.*?\\*/)|(//[^\n]*)"); // Matches C and C++ comments.
+    out.push(regex_filter(pattern, ""));       // Replaces comments with "".
+    out.push(cout);
+
+    // Print unfiltered code.
+    cout << "**** Code unfiltered ****\n\n" << code << "\n\n";
+
+    // Print filtered code:
+    cout << "**** Code with comments removed ****\n\n";
+    out << code << "\n\n";
+}
+
+int main()
+{
+    test_regex();
+    return 0;
+}