Function parseCommaSepArgs

external/utf8-cpp-utils/test/doctest.h:6503–6546

parses a comma separated list of words after a pattern in one of the arguments in argv

    // parses a comma separated list of words after a pattern in one of the arguments in argv
    bool parseCommaSepArgs(int argc, const char* const* argv, const char* pattern,
                           std::vector<String>& res) {
        String filtersString;
        if(parseOption(argc, argv, pattern, &filtersString)) {
            // tokenize with "," as a separator, unless escaped with backslash
            std::ostringstream s;
            auto flush = [&s, &res]() {
                auto string = s.str();
                if(string.size() > 0) {
                    res.push_back(string.c_str());
                }
                s.str("");
            };

            bool seenBackslash = false;
            const char* current = filtersString.c_str();
            const char* end = current + strlen(current);
            while(current != end) {
                char character = *current++;
                if(seenBackslash) {
                    seenBackslash = false;
                    if(character == ',' || character == '\\') {
                        s.put(character);
                        continue;
                    }
                    s.put('\\');
                }
                if(character == '\\') {
                    seenBackslash = true;
                } else if(character == ',') {
                    flush();
                } else {
                    s.put(character);
                }
            }

            if(seenBackslash) {
                s.put('\\');
            }
            flush();
            return true;
        }
        return false;
    }

    enum optionType
    {