You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: uaparser.go
    path of file: ./repos/openreplay/backend/internal/http/uaparser
    
    the code of the file until where you have to start completion: package uaparser

import (
	"log"
	"strings"

	"github.com/ua-parser/uap-go/uaparser"
)

type UAParser struct {
	p *uaparser.Parser
}

func NewUAParser(regexFile string) *UAParser {
	p, err := uaparser.New(regexFile)
	if err != nil {
		log.Fatalln(err)
	}
	return &UAParser{p}
}

type UA struct {
	OS             string
	OSVersion      string
	Browser        string
	BrowserVersion string
	Device         string
	Devic
    
func (parser *UAParser) Parse(str string) *UA {
	if str == "" {
		return nil
	}
	data := parser.p.Parse(str)
	if data == nil {
		return nil
	}
	ua := &UA{
		OS:      data.Os.Family,
		Browser: strings.Split(data.UserAgent.Family, "/")[0],
		Device:  data.Device.Family,
	}
	if ua.OS == "" || ua.Browser == "" || ua.Device == "Spider" {
		return nil
	}
	if ua.Device == "Other" || ua.Device == "Mac" {
		ua.Device = ""
	}
	if data.Os.Major != "" {
		ua.OSVersion += data.Os.Major
		if data.Os.Minor != "" {
			ua.OSVersion += "." + data.Os.Minor
			if data.Os.Patch != "" {
				ua.OSVersion += "." + data.Os.Patch
			}
		}
	}
	if data.UserAgent.Major != "" {
		ua.BrowserVersion += data.UserAgent.Major
		if data.UserAgent.Minor != "" {
			ua.BrowserVersion += "." + data.UserAgent.Minor
			if data.UserAgent.Patch != "" {
				ua.BrowserVersion += "." + data.UserAgent.Patch
			}
		}
	}
	switch ua.OS {
	case "Chrome OS", "Fedora", "FreeBSD", "Linux", "Mac OS X", "NetBSD", "Ubuntu", "Windows":
		ua.DeviceType = "desktop"
	case "Android", "BlackBerry OS", "BlackBerry Tablet OS", "iOS", "Windows Phone":
		ua.DeviceType = "mobile"
	default:
		ua.DeviceType = "other"
	}
	return ua
}