GS1（Globestandard1）码的解析package drugcode
import (
"github/pkg/errors"
"math"
"regexp"
"strconv"
"strings"
)
const minLen = 14
const Gs1TagStr = "%1D"
const Gs1Tag = "\u001D"
/
/BadDrugCode 不合法的drug_code
var BadDrugCode = errors.New("不合法的")
func GetDrugCode(code string) string {
return strings.ReplaceAll(code, Gs1Tag, Gs1TagStr)
}
//_AI ai标识
type _AI struct {
Ai        string
Re        *regexp.Regexp
Name      string
replaceall()
transform func([]string) string
}
var (
//AiSscc ai标识
AiSscc = &_AI{Ai: "00", Re: regexp.MustCompile(`^00(\d{18})`), Name: "SSCC"}
//AiGtin ai标识
AiGtin = &_AI{Ai: "01", Re: regexp.MustCompile(`^01(\d{14})`), Name: "GTIN"}
//AiEan ai标识
AiEan = &_AI{Ai: "02", Re: regexp.MustCompile(`^02(\d{14})`), Name: "GTIN"}
//AiLote ai标识
AiLote = &_AI{Ai: "10", Re: regexp.MustCompile("^10([^\u001D]{1,20})"), Name: "LOTE"}
//Ai13 ai标识
Ai13 = &_AI{Ai: "13", Re: regexp.MustCompile(`^13(\d{6})`), Name: ""}
//AiFCons15 ai标识
AiFCons15 = &_AI{Ai: "15", Re: regexp.MustCompile(`^15(\d{6})`), Name: "F_CONS", transform: trans2}
//AiFCons17 ai标识
AiFCons17 = &_AI{Ai: "17", Re: regexp.MustCompile(`^17(\d{6})`), Name: "F_CONS", transform: trans2}
//AiFCons19 ai标识
AiFCons19 = &_AI{Ai: "19", Re: regexp.MustCompile(`^19(\d{6})`), Name: "F_CONS", transform: trans2}
//AiSn ai标识
AiSn = &_AI{Ai: "21", Re: regexp.MustCompile(`^21([\d\w]{1,20})`), Name: "SN"}
/
/Ai30 ai标识
Ai30 = &_AI{Ai: "30", Re: regexp.MustCompile(`^30(\d{1,8})`), Name: ""}
//AiNtgew310 ai标识
AiNtgew310 = &_AI{Ai: "310", Re: regexp.MustCompile(`^310(\d)(\d{6})`), Name: "NTGEW", transform: trans1}
//AiNtgew320 ai标识
AiNtgew320 = &_AI{Ai: "320", Re: regexp.MustCompile(`^320(\d)(\d{6})`), Name: "NTGEW", transform: trans1}
//Ai330 ai标识
Ai330 = &_AI{Ai: "330", Re: regexp.MustCompile(`^330(\d)(\d{6})`), Name: ""}
//AiCant  ai标识
AiCant = &_AI{Ai: "37", Re: regexp.MustCompile(`^37(\d{1,8})`), Name: "CANT"}
aiMap  = map[string]*_AI{
aiMap  = map[string]*_AI{
AiSscc.Ai: AiSscc, AiGtin.Ai: AiGtin, AiEan.Ai: AiEan, AiLote.Ai: AiLote, Ai13.Ai: Ai13, AiFCons15.Ai: AiFCons15, AiFCons17.Ai: AiFCons17, AiFCons19.Ai: AiFCon  }
)
func trans1(match []string) string {
m2, _ := strconv.Atoi(match[2])
m1, _ := strconv.Atoi(match[1])
return strconv.Itoa(m2 / int(math.Pow10(m1)))
}
func trans2(match []string) string {
s := match[1]
return "20" + s[0:2] + "-" + s[2:4] + "-" + s[4:6]
}
//Ais ai标识列表
type Ais struct {
AiMap    map[string]string
AiNameMap map[string]string
NtgewAi  *_AI
}
//Get 从AI获取
func (a *Ais) Get(ai *_AI) string {
return a.AiMap[ai.Ai]
}
//GetFromName 从名称获取
func (a *Ais) GetFromName(ai string) string {
return a.AiNameMap[ai]
}
func (a *Ais) setAi(ai *_AI, match []string) {
s := match[1]
ansform != nil {
s = ai.transform(match)
}
if len(ai.Name) > 1 {
a.AiNameMap[ai.Name] = s
}
a.AiMap[ai.Ai] = s
if ai.Name == AiNtgew310.Name {
a.NtgewAi = ai
}
}
//AiParse 获取标识列表
func AiParse(code string) (*Ais, error) {
code = strings.ReplaceAll(code, Gs1TagStr, Gs1Tag)
if strings.Index(code, Gs1Tag) < 0 {
return nil, BadDrugCode
}
ais := &Ais{
AiMap:    make(map[string]string),
AiNameMap: make(map[string]string),
NtgewAi:  nil,
}
for {
code = strings.TrimPrefix(code, Gs1Tag)
code = strings.TrimPrefix(code, " ")
if len(code) < 3 {
break
}
}
ai, ok := aiMap[code[:2]]
if !ok {
ai, ok = aiMap[code[:3]]
if !ok {
break
}
}
if strings.HasPrefix(code, ai.Ai) && ai.Re.MatchString(code) {  match := ai.Re.FindStringSubmatch(code)
ais.setAi(ai, match)
code = strings.TrimPrefix(code, match[0])
}
}
return ais, nil
}

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