finishParsing = () => {
    // Resetting the arguments isn't strictly necessary, but it makes debugging
    // less confusing (otherwise args will stick around until the next sequence
    // that needs arguments).
    parseState.resetArguments();
    // We need to clear subargs since we explicitly set it.
    parseState.subargs = null;
    parseState.resetParseFunction();
  }
Parse a Control Sequence Introducer code and dispatch it.

See [CSI] for some useful information about these codes.

@param {!hterm.VT.ParseState} parseState The current parse state.