44 lines
925 B
Go
44 lines
925 B
Go
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package qcxg
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import (
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_ "embed"
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"encoding/json"
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"strings"
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"unicode/utf8"
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)
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//go:embed data/car_plate.json
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var carPlateJSON []byte
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var carPlateCityMap map[string]string
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func init() {
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carPlateCityMap = make(map[string]string)
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_ = json.Unmarshal(carPlateJSON, &carPlateCityMap)
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}
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// lookupCityByPlateNo 根据车牌号前缀（省简称+字母）查城市，未匹配返回 "-"
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func lookupCityByPlateNo(plateNo string) string {
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prefix := extractPlatePrefix(plateNo)
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if prefix == "" {
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return "-"
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}
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if city, ok := carPlateCityMap[prefix]; ok && city != "" {
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return city
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}
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return "-"
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}
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// extractPlatePrefix 取车牌前两个字符作为字典键，如 "鲁A12345" -> "鲁A"
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func extractPlatePrefix(plateNo string) string {
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plateNo = strings.TrimSpace(plateNo)
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if plateNo == "" {
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return ""
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}
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if utf8.RuneCountInString(plateNo) < 2 {
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return ""
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}
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runes := []rune(plateNo)
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return string(runes[:2])
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}
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