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language.go
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language.go
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package i18n
import (
"database/sql/driver"
"github.com/nyaruka/null/v2"
"github.com/pkg/errors"
"golang.org/x/text/language"
)
// Language is holds a an ISO-639-3 language code.
type Language string
// ISO639_1 returns the ISO-639-1 2-letter code for this language if it has one
func (l Language) ISO639_1() string {
base, err := language.ParseBase(string(l))
if err != nil {
return ""
}
code := base.String()
// not all languages have a 2-letter code
if len(code) != 2 {
return ""
}
return code
}
// NilLanguage represents our nil, or unknown language
var NilLanguage = Language("")
// ParseLanguage returns a new Language for the passed in language string, or an error if not found
func ParseLanguage(lang string) (Language, error) {
if len(lang) != 3 {
return NilLanguage, errors.Errorf("iso-639-3 codes must be 3 characters, got: %s", lang)
}
base, err := language.ParseBase(lang)
if err != nil {
return NilLanguage, errors.Errorf("unrecognized language code: %s", lang)
}
return Language(base.ISO3()), nil
}
// Place nicely with NULLs if persisting to a database or JSON
func (l *Language) Scan(value any) error { return null.ScanString(value, l) }
func (l Language) Value() (driver.Value, error) { return null.StringValue(l) }
func (l Language) MarshalJSON() ([]byte, error) { return null.MarshalString(l) }
func (l *Language) UnmarshalJSON(b []byte) error { return null.UnmarshalString(b, l) }