Function parse_keyseq

crawl-ref/source/macro.cc:398–461

* Takes as argument a string, and returns a sequence of keys described * by the string. Most characters produce their own ASCII code. These * are the cases: * \\ produces the ASCII code of a single \ * \{123} produces 123 (decimal) * \{^A} produces 1 (Ctrl-A) * \{x40} produces 64 (hexadecimal code) * \{!more} or \{!m} disables -more- prompt until the end of the macro. */

 *   \{!more} or \{!m} disables -more- prompt until the end of the macro.
 */
keyseq parse_keyseq(string s)
{
    // TODO parse readable descriptions of special keys, e.g. \{F1} or something
    int state = 0;
    keyseq v;

    if (starts_with(s, "==="))
    {
        buf2keyseq(s.c_str(), v);
        return v;
    }

    bool more_reset = false;
    for (int i = 0, size = s.length(); i < size; ++i)
    {
        char c = s[i];

        switch (state)
        {
        case 0: // Normal state
            if (c == '\\')
                state = 1;
            else
                v.push_back(c);
            break;

        case 1: // Last char is a '\'
            if (c == '\\')
            {
                state = 0;
                v.push_back(c);
            }
            else if (c == '{')
                state = 2;
            // XXX Error handling
            break;

        case 2: // Inside \{}
        {
            const string::size_type clb = s.find('}', i);
            if (clb == string::npos)
                break;

            const string arg = s.substr(i, clb - i);
            if (!more_reset && (arg == "!more" || arg == "!m"))
            {
                more_reset = true;
                v.push_back(KEY_MACRO_MORE_PROTECT);
            }
            else
            {
                const int key = read_key_code(arg);
                v.push_back(key);
            }

            state = 0;
            i = clb;
            break;