Function parse_constructor

src/sqlite-vss.cpp:709–783

}

unique_ptr<vector<VssIndexColumn>> parse_constructor(int argc,
                                                     const char *const *argv) {

    auto columns = unique_ptr<vector<VssIndexColumn>>(new vector<VssIndexColumn>());

    for (int i = 3; i < argc; i++) {

        string arg = string(argv[i]);

        size_t lparen = arg.find("(");
        size_t rparen = arg.find(")");

        if (lparen == string::npos || rparen == string::npos ||
            lparen >= rparen) {
            return nullptr;
        }

        string name = arg.substr(0, lparen);
        string sDimensions = arg.substr(lparen + 1, rparen - lparen - 1);

        sqlite3_int64 dimensions = atoi(sDimensions.c_str());

        size_t factoryStart, factoryStringStartFrom;
        string factory;

        if ((factoryStart = arg.find("factory", rparen)) != string::npos &&
            (factoryStringStartFrom = arg.find("=", factoryStart)) !=
                string::npos) {

            size_t lquote = arg.find("\"", factoryStringStartFrom);
            size_t rquote = arg.find_last_of("\"");

            if (lquote == string::npos || rquote == string::npos ||
                lquote >= rquote) {
                return nullptr;
            }
            factory = arg.substr(lquote + 1, rquote - lquote - 1);

        } else {
            factory = string("Flat,IDMap2");
        }

        faiss::MetricType metric_type;
        size_t metricStart, metricStringStartFrom;

        if ((metricStart = arg.find("metric_type", rparen)) != string::npos &&
            (metricStringStartFrom = arg.find("=", metricStart)) != string::npos) {

            size_t lquote = arg.find_first_not_of(" ", metricStringStartFrom + 1);
            size_t rquote = arg.find(",", lquote);

            if(lquote == -1) {
              throw std::invalid_argument( "invalid metric_type value" );
            }

            if (rquote == string::npos) {
                rquote = arg.size();
            }