/**
 * Parse the useragent and return every part that was found.
 *
 * @param userAgent The useragent instance that needs to be parsed
 * @return If the parse was valid (i.e. were there any parser errors: true=valid; false=has errors
 */
private MutableUserAgent parseIntoCleanUserAgent(MutableUserAgent userAgent) {
    if (userAgent.getUserAgentString() == null) {
        userAgent.set(SYNTAX_ERROR, "true", 1);
        return userAgent; // Cannot parse this
    }

    // Parse the userAgent into tree
    UserAgentContext userAgentContext = parseUserAgent(userAgent);

    // Walk the tree an inform the calling analyzer about all the nodes found
    state = new ParseTreeProperty<>();

    State rootState = new State(AGENT);
    rootState.calculatePath(PathType.CHILD, false);
    state.put(userAgentContext, rootState);

    if (userAgent.hasSyntaxError()) {
        inform(null, SYNTAX_ERROR, "true");
    } else {
        inform(null, SYNTAX_ERROR, "false");
    }

    ParseTreeWalker.DEFAULT.walk(this, userAgentContext);
    return userAgent;
}