Function transformNamedArguments

src/rpc/server.cpp:395–439

* Process named arguments into a vector of positional arguments, based on the * passed-in specification for the RPC call's arguments. */

 * passed-in specification for the RPC call's arguments.
 */
static inline JSONRPCRequest transformNamedArguments(const JSONRPCRequest& in, const std::vector<std::string>& argNames)
{
    JSONRPCRequest out = in;
    out.params = UniValue(UniValue::VARR);
    // Build a map of parameters, and remove ones that have been processed, so that we can throw a focused error if
    // there is an unknown one.
    const std::vector<std::string>& keys = in.params.getKeys();
    const std::vector<UniValue>& values = in.params.getValues();
    std::unordered_map<std::string, const UniValue*> argsIn;
    for (size_t i=0; i<keys.size(); ++i) {
        argsIn[keys[i]] = &values[i];
    }
    // Process expected parameters.
    int hole = 0;
    for (const std::string &argNamePattern: argNames) {
        std::vector<std::string> vargNames;
        boost::algorithm::split(vargNames, argNamePattern, boost::algorithm::is_any_of("|"));
        auto fr = argsIn.end();
        for (const std::string & argName : vargNames) {
            fr = argsIn.find(argName);
            if (fr != argsIn.end()) {
                break;
            }
        }
        if (fr != argsIn.end()) {
            for (int i = 0; i < hole; ++i) {
                // Fill hole between specified parameters with JSON nulls,
                // but not at the end (for backwards compatibility with calls
                // that act based on number of specified parameters).
                out.params.push_back(UniValue());
            }
            hole = 0;
            out.params.push_back(*fr->second);
            argsIn.erase(fr);
        } else {
            hole += 1;
        }
    }
    // If there are still arguments in the argsIn map, this is an error.
    if (!argsIn.empty()) {
        throw JSONRPCError(RPC_INVALID_PARAMETER, "Unknown named parameter " + argsIn.begin()->first);
    }
    // Return request with named arguments transformed to positional arguments
    return out;
}

static bool ExecuteCommands(const std::vector<const CRPCCommand*>& commands, const JSONRPCRequest& request, UniValue& result)
{