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loca_value.go
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/
loca_value.go
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package golib
import (
"database/sql/driver"
"encoding/json"
"encoding/xml"
"fmt"
"strings"
"golang.org/x/text/language"
)
type LocaValue map[string]string
// Trim removes all whitespace from set values
// and remove empty values entirely
func (lv LocaValue) TrimSpace() (lv2 LocaValue) {
lv2 = LocaValue{}
for lang, value := range lv {
value = strings.TrimSpace(value)
if value != "" {
lv2[lang] = value
}
}
return lv2
}
// LangShort cuts the lang returns the first part
//
func LangShort(lang string) string {
if lang == "" {
return lang
}
parts := strings.Split(lang, "-")
return parts[0]
}
// First returns first set lang, set in langs
func (lv LocaValue) Best(prefLangs ...language.Tag) string {
if lv == nil {
return ""
}
for _, lang := range prefLangs {
v := lv[lang.String()]
if v != "" {
return v
}
}
// Return first lang which is set
for _, v := range lv {
if v != "" {
return v
}
}
return ""
}
func (lv LocaValue) Value() (driver.Value, error) {
// if len(lv) == 0 {
// return nil, nil
// }
return json.Marshal(lv)
}
func (lv LocaValue) MarshalXML(enc *xml.Encoder, start xml.StartElement) error {
enc.EncodeToken(start)
for key, value := range lv {
enc.EncodeElement(value, XmlStart(key))
}
enc.EncodeToken(start.End())
return nil
}
func (lv *LocaValue) Scan(v interface{}) error {
if v == nil {
return nil
}
switch v2 := v.(type) {
case []uint8:
return json.Unmarshal(v2, lv)
case string:
return json.Unmarshal([]uint8(v2), lv)
default:
panic(fmt.Sprintf("LocaValuenc.Scan: Unsupported type for scan: %T", v))
}
}
func (lv LocaValue) Copy() LocaValue {
if lv == nil {
return nil
}
lv2 := LocaValue{}
for k, v := range lv {
lv2[k] = v
}
return lv2
}
// Fill returns the LocaValue with all languages filled out
// If a value is missing, "Best" is used to fill it
func (lv LocaValue) Fill(prefLangs ...language.Tag) (lv2 LocaValue) {
lv2 = LocaValue{}
for _, prefLang := range prefLangs {
pl := prefLang.String()
if lv[pl] != "" {
lv2[pl] = lv[pl]
} else {
lv2[pl] = lv2.Best(prefLangs...)
}
}
return lv2
}