Function testComments

test/basic_parser.cpp:1023–1128

    };

    void
    testComments()
    {
        parse_options disabled;
        parse_options enabled;
        enabled.allow_comments = true;

        const auto replace_and_test =
            [&](string_view s)
        {
            static std::vector<string_view> comments =
            {
                "//\n",
                "//    \n",
                "//aaaa\n",
                "//    aaaa\n",
                "//    /* \n",
                "//    /**/ \n",
                "/**/",
                "/*//*/",
                "/*/*/",
                "/******/",
                "/***    ***/",
                "/**aaaa***/",
                "/***    aaaa***/"
            };

            std::string formatted = "";
            std::string just_comments = "";
            std::size_t guess = std::count(
                s.begin(), s.end(), '@') * 12;
            formatted.reserve(guess + s.size());
            just_comments.reserve(guess);
            std::size_t n = 0;
            for (char c : s)
            {
                if (c == '@')
                {
                    string_view com =
                        comments[((formatted.size() + n) % s.size()) % comments.size()];
                    formatted.append(com.data(), n = com.size());
                    just_comments.append(com.data(), com.size());
                    continue;
                }
                formatted += c;
            }
            TEST_BAD_EXT(formatted, disabled);
            TEST_GOOD_EXT(formatted, enabled);

            {
                // test the handler
                comment_parser p;
                system::error_code ec;
                p.write( formatted.data(), formatted.size(), ec );
                BOOST_TEST(! ec);
                BOOST_TEST(p.captured() == just_comments);
            }
        };